project_name/
├── src/
│   ├── main/
│   │   ├── control_logic.umc
│   │   ├── device_modules/
│   │   └── user_interfaces/
│   ├── config/
│   │   ├── device_config.cfg
│   │   ├── network_settings.cfg
│   │   └── system_constants.cfg
│   ├── modules/
│   │   ├── audio_control.umc
│   │   ├── video_switching.umc
│   │   └── lighting_control.umc
│   └── utilities/
│       ├── string_functions.umc
│       └── math_utilities.umc
├── interfaces/
│   ├── main_touch_panel.vtz
│   ├── mobile_interface.html
│   └── web_interface/
├── docs/
│   ├── system_design.md
│   ├── user_manual.pdf
│   └── programming_notes.md
└── tests/
    ├── unit_tests/
    └── integration_tests/

// File: audio_control.umc
// Purpose: Centralized audio system management
// Author: [Name] | Date: [Date] | Version: 1.0

#DEFINE_CONSTANT AUDIO_MODULE_VERSION "1.0"
#DEFINE_CONSTANT MAX_AUDIO_ZONES 8
#DEFINE_CONSTANT DEFAULT_VOLUME_LEVEL 50

// Public interface functions
FUNCTION InitializeAudioSystem()
{
    // Initialize audio DSP connections
    // Set default volume levels
    // Configure audio routing matrix
}

FUNCTION SetZoneVolume(INTEGER zone, INTEGER level)
{
    // Input validation
    IF (zone >= 1 AND zone <= MAX_AUDIO_ZONES)
    {
        IF (level >= 0 AND level <= 100)
        {
            // Set volume for specified zone
            AudioZones[zone].Volume = level;
            SendVolumeCommand(zone, level);
        }
    }
}

FUNCTION INTEGER GetZoneVolume(INTEGER zone)
{
    // Return current volume level for zone
    IF (zone >= 1 AND zone <= MAX_AUDIO_ZONES)
    {
        RETURN AudioZones[zone].Volume;
    }
    RETURN -1; // Invalid zone
}

// System initialization sequence
FUNCTION SystemStartup()
{
    // Step 1: Initialize hardware connections
    InitializeHardwareConnections();
    
    // Step 2: Load system configuration
    LoadSystemConfiguration();
    
    // Step 3: Initialize user interfaces
    InitializeUserInterfaces();
    
    // Step 4: Start system monitoring
    StartSystemHealthMonitoring();
    
    // Step 5: Enable user interaction
    EnableSystemControl();
}

// Hardware initialization
FUNCTION InitializeHardwareConnections()
{
    // Network device connections
    ConnectNetworkDevices();
    
    // Serial device connections  
    ConnectSerialDevices();
    
    // Digital I/O initialization
    InitializeDigitalIO();
}

// File: system_constants.cfg
// System-wide configuration constants

// Network Settings
#DEFINE_CONSTANT CONTROL_PROCESSOR_IP "192.168.1.10"
#DEFINE_CONSTANT VIDEO_SWITCHER_IP "192.168.1.20"
#DEFINE_CONSTANT AUDIO_DSP_IP "192.168.1.30"

// Timing Constants
#DEFINE_CONSTANT DEVICE_RESPONSE_TIMEOUT 30s
#DEFINE_CONSTANT SYSTEM_STARTUP_DELAY 10s
#DEFINE_CONSTANT AUTO_SHUTDOWN_TIMER 1800s // 30 minutes

// System Limits
#DEFINE_CONSTANT MAX_SIMULTANEOUS_USERS 4
#DEFINE_CONSTANT MAX_SOURCE_INPUTS 16
#DEFINE_CONSTANT MAX_DISPLAY_OUTPUTS 8

// User Interface Settings
#DEFINE_CONSTANT UI_REFRESH_RATE 100ms
#DEFINE_CONSTANT BUTTON_DEBOUNCE_TIME 200ms

// Good naming - clearly indicates purpose and scope
DIGITAL conference_room_projector_power;
DIGITAL main_audio_system_mute_status;
DIGITAL lighting_preset_presentation_mode;
DIGITAL user_interface_home_button_press;

// Poor naming - unclear and non-descriptive
DIGITAL d1;
DIGITAL proj_pwr;
DIGITAL mute;
DIGITAL btn1;

// Good naming with units and ranges indicated in comments
ANALOG main_room_volume_level;          // Range: 0-100 (percentage)
ANALOG projector_lamp_hours_remaining;  // Hours remaining before replacement
ANALOG room_temperature_celsius;        // Temperature in Celsius * 10
ANALOG lighting_dimmer_level_percent;   // Range: 0-100 (percentage)

// Poor naming without context
ANALOG vol;
ANALOG temp;
ANALOG level;
ANALOG value1;

// Good naming with maximum length specified
STRING device_status_message[100];
STRING current_source_name[50];
STRING user_login_credentials[255];
STRING system_error_description[500];

// Include array sizing for clarity
STRING ip_address_list[10][16];  // 10 IP addresses, max 16 chars each

// Action functions - use imperative verbs
FUNCTION PowerOnProjector()
FUNCTION SetAudioVolume(INTEGER level)
FUNCTION DisplaySystemStatus()
FUNCTION InitializeNetworkConnections()

// Query functions - use "Get" or "Is" prefixes
FUNCTION INTEGER GetCurrentVolume()
FUNCTION DIGITAL IsProjectorOnline()
FUNCTION STRING GetDeviceStatus()
FUNCTION DIGITAL IsSystemReady()

// Event handlers - use "On" prefix
FUNCTION OnPowerButtonPress()
FUNCTION OnVolumeSliderChange()
FUNCTION OnDeviceConnected()
FUNCTION OnSystemShutdown()

/*
 * File: conference_room_control.umc
 * Project: Corporate Headquarters AV System
 * Purpose: Main conference room control logic
 * Author: John Smith
 * Created: 2024-01-15
 * Modified: 2024-03-10
 * Version: 2.1
 * 
 * Description:
 * This module handles all control logic for Conference Room A,
 * including projector control, audio management, lighting presets,
 * and user interface interactions.
 * 
 * Dependencies:
 * - audio_control.umc
 * - video_switching.umc
 * - lighting_control.umc
 * 
 * Hardware Requirements:
 * - Crestron CP4N Control Processor
 * - Epson EB-L1755U Projector
 * - Biamp TesiraFORTE Audio DSP
 * - Lutron Quantum Lighting System
 */

/*
 * Function: SetRoomPreset
 * Purpose: Configures room for specific usage scenarios
 * 
 * Parameters:
 *   preset_type (INTEGER): Preset identifier (1-5)
 *     1 = Presentation Mode
 *     2 = Video Conference Mode
 *     3 = Collaboration Mode
 *     4 = Training Mode
 *     5 = Shutdown Mode
 * 
 * Returns: DIGITAL - Success (1) or Failure (0)
 * 
 * Side Effects:
 *   - Adjusts lighting levels
 *   - Powers equipment on/off
 *   - Sets audio levels
 *   - Configures video routing
 * 
 * Example Usage:
 *   success = SetRoomPreset(1); // Set presentation mode
 */
FUNCTION DIGITAL SetRoomPreset(INTEGER preset_type)
{
    // Function implementation...
}

FUNCTION HandleVolumeControl(INTEGER new_level)
{
    // Validate input range (0-100 percentage)
    IF (new_level < 0 OR new_level > 100)
    {
        LogError("Invalid volume level: " + ITOA(new_level));
        RETURN;
    }
    
    // Convert percentage to DSP scale (0-65535)
    volume_dsp_value = (new_level * 65535) / 100;
    
    // Apply fade time for smooth transitions
    audio_processor_volume = volume_dsp_value;
    
    // Update user interface displays
    volume_text_feedback = ITOA(new_level) + "%";
    volume_slider_position = new_level;
    
    // Log volume change for diagnostics
    LogInfo("Volume changed to: " + ITOA(new_level) + "%");
}

// Good comments - explain reasoning and context
// Use exponential backoff to avoid overwhelming network devices
retry_delay = retry_delay * 2;

// Convert temperature from sensor (Fahrenheit * 10) to display format
display_temperature = (sensor_temperature / 10) - 32) * 5 / 9;

// TODO: Implement user authentication before v2.0 release
// ASSUMPTION: Network devices respond within 5 seconds under normal conditions

// Poor comments - state the obvious
volume_level = 50;        // Set volume level to 50
power_button = ON;        // Turn on power button

FUNCTION SendDeviceCommand(STRING device_ip[16], STRING command[255])
{
    // Set timeout for device response
    WAIT DEVICE_RESPONSE_TIMEOUT 'device_timeout_' + device_ip
    {
        // Handle timeout - device not responding
        device_status[device_ip].online = 0;
        device_status[device_ip].last_error = "Device timeout";
        device_status[device_ip].error_count = device_status[device_ip].error_count + 1;
        
        // Log error for diagnostics
        LogError("Device timeout: " + device_ip + " - Command: " + command);
        
        // Notify user interface
        UpdateDeviceStatusDisplay(device_ip, "OFFLINE");
        
        // Attempt recovery if error count is below threshold
        IF (device_status[device_ip].error_count < MAX_RETRY_ATTEMPTS)
        {
            // Wait before retry to avoid overwhelming device
            WAIT RETRY_DELAY 'retry_' + device_ip
            {
                SendDeviceCommand(device_ip, command);
            }
        }
        ELSE
        {
            // Mark device as failed after max retries
            device_status[device_ip].failed = 1;
            TriggerSystemAlert("Device failed: " + device_ip);
        }
    }
    
    // Send the command
    device_command_output[device_ip] = command;
}

// Handle successful device response
WHEN (device_response_input[device_ip])
{
    // Cancel timeout timer
    CANCELWAIT 'device_timeout_' + device_ip;
    
    // Reset error counters on successful response
    device_status[device_ip].online = 1;
    device_status[device_ip].error_count = 0;
    device_status[device_ip].failed = 0;
    device_status[device_ip].last_response_time = GetCurrentTime();
    
    // Update user interface
    UpdateDeviceStatusDisplay(device_ip, "ONLINE");
    
    // Process device response
    ProcessDeviceResponse(device_ip, device_response_input[device_ip]);
}

FUNCTION DIGITAL SetDisplayInput(INTEGER input_number)
{
    // Validate input range
    IF (input_number < 1 OR input_number > MAX_DISPLAY_INPUTS)
    {
        LogError("Invalid display input: " + ITOA(input_number) + 
                " (Valid range: 1-" + ITOA(MAX_DISPLAY_INPUTS) + ")");
        
        // Show error message to user
        DisplayUserMessage("Invalid input selection", ERROR_MESSAGE);
        RETURN 0; // Failure
    }
    
    // Check if display is powered on
    IF (display_power_status = OFF)
    {
        LogWarning("Attempted to change input while display is off");
        DisplayUserMessage("Please power on display first", WARNING_MESSAGE);
        RETURN 0; // Failure
    }
    
    // Check if requested input is available
    IF (input_status[input_number].connected = 0)
    {
        LogWarning("No signal detected on input " + ITOA(input_number));
        DisplayUserMessage("No signal on selected input", WARNING_MESSAGE);
        // Continue with input change - user may want to switch anyway
    }
    
    // Execute input change
    display_input_selection = input_number;
    current_input = input_number;
    
    LogInfo("Display input changed to: " + ITOA(input_number));
    RETURN 1; // Success
}

FUNCTION MonitorDeviceConnections()
{
    INTEGER i;
    
    // Check all registered network devices
    FOR (i = 1; i <= total_network_devices; i++)
    {
        // Ping device to check connectivity
        IF (device_list[i].enabled = 1)
        {
            // Send keep-alive or status query
            SendKeepAlive(device_list[i].ip_address);
            
            // Check if device has been offline too long
            IF (device_list[i].offline_duration > MAX_OFFLINE_TIME)
            {
                LogWarning("Device offline extended period: " + device_list[i].name);
                
                // Attempt to re-establish connection
                AttemptDeviceReconnection(i);
            }
        }
    }
    
    // Schedule next monitoring cycle
    WAIT DEVICE_MONITOR_INTERVAL 'device_monitor_timer'
    {
        MonitorDeviceConnections();
    }
}

FUNCTION AttemptDeviceReconnection(INTEGER device_index)
{
    STRING device_name[50];
    STRING device_ip[16];
    
    device_name = device_list[device_index].name;
    device_ip = device_list[device_index].ip_address;
    
    LogInfo("Attempting to reconnect: " + device_name);
    
    // Close existing connection if present
    CloseDeviceConnection(device_index);
    
    // Wait for connection cleanup
    WAIT 30 'reconnection_delay_' + ITOA(device_index)
    {
        // Re-initialize device connection
        InitializeDeviceConnection(device_index);
        
        // Test connection with simple command
        TestDeviceConnection(device_index);
    }
}

FUNCTION RecoverSystemState()
{
    // Save current system state before recovery attempt
    SaveSystemState("pre_recovery_state.cfg");
    
    LogInfo("Beginning system state recovery");
    
    // Step 1: Re-initialize all device connections
    LogInfo("Recovery Step 1: Re-initializing device connections");
    InitializeAllDeviceConnections();
    
    // Step 2: Restore last known good configuration
    LogInfo("Recovery Step 2: Restoring system configuration");
    LoadSystemConfiguration("last_known_good.cfg");
    
    // Step 3: Verify critical system functions
    LogInfo("Recovery Step 3: Verifying system functions");
    IF (VerifySystemFunctions() = 0)
    {
        LogError("System function verification failed");
        // Fall back to safe mode
        EnterSafeMode();
    }
    ELSE
    {
        LogInfo("System recovery completed successfully");
        DisplayUserMessage("System recovered", SUCCESS_MESSAGE);
    }
    
    // Step 4: Re-enable user interfaces
    LogInfo("Recovery Step 4: Re-enabling user interfaces");
    EnableUserInterfaces();
}

// Error message severity levels
#DEFINE_CONSTANT INFO_MESSAGE 1
#DEFINE_CONSTANT WARNING_MESSAGE 2
#DEFINE_CONSTANT ERROR_MESSAGE 3
#DEFINE_CONSTANT CRITICAL_MESSAGE 4

FUNCTION DisplayUserMessage(STRING message[255], INTEGER severity)
{
    STRING severity_text[20];
    STRING timestamp[30];
    
    // Generate timestamp
    timestamp = GetFormattedTime();
    
    // Determine severity text and display properties
    SWITCH (severity)
    {
        CASE INFO_MESSAGE:
            severity_text = "INFO";
            message_text_color = BLUE;
            message_display_time = 30; // 3 seconds
            BREAK;
            
        CASE WARNING_MESSAGE:
            severity_text = "WARNING";
            message_text_color = YELLOW;
            message_display_time = 50; // 5 seconds
            BREAK;
            
        CASE ERROR_MESSAGE:
            severity_text = "ERROR";
            message_text_color = RED;
            message_display_time = 100; // 10 seconds
            BREAK;
            
        CASE CRITICAL_MESSAGE:
            severity_text = "CRITICAL";
            message_text_color = RED;
            message_display_time = 200; // 20 seconds
            // Flash display for critical messages
            message_flash_enable = 1;
            BREAK;
    }
    
    // Format complete message
    formatted_message = "[" + timestamp + "] " + severity_text + ": " + message;
    
    // Display on user interface
    system_message_text = formatted_message;
    system_message_visibility = 1;
    
    // Log message
    LogMessage(formatted_message, severity);
    
    // Auto-hide message after specified time
    WAIT message_display_time 'hide_message'
    {
        system_message_visibility = 0;
        message_flash_enable = 0;
    }
}

FUNCTION LogError(STRING error_message[255])
{
    WriteToLogFile("ERROR", error_message);
    error_count = error_count + 1;
    
    // Send to remote monitoring system if configured
    IF (remote_monitoring_enabled = 1)
    {
        SendRemoteAlert("ERROR", error_message);
    }
}

FUNCTION WriteToLogFile(STRING level[10], STRING message[255])
{
    STRING log_entry[500];
    STRING timestamp[30];
    
    timestamp = GetFormattedTime();
    log_entry = timestamp + " [" + level + "] " + message + "\x0D\x0A";
    
    // Write to system log file
    FILEWRITE(system_log_file, log_entry);
    
    // Manage log file size
    ManageLogFileSize();
}

// Pre-allocate string buffers for frequently used strings
STRING temp_string_buffer[1000];
STRING command_buffer[255];
STRING response_buffer[1000];
STRING log_buffer[500];

// Reuse buffers instead of creating new strings
FUNCTION ProcessDeviceResponse(STRING device_response[1000])
{
    // Clear buffer before use
    ClearBuffer(temp_string_buffer);
    
    // Use existing buffer instead of creating new strings
    temp_string_buffer = device_response;
    
    // Process response using buffer
    ParseDeviceStatus(temp_string_buffer);
    
    // Clear buffer after use to free memory
    ClearBuffer(temp_string_buffer);
}

// Efficient string operations
FUNCTION STRING BuildCommandString(STRING command[50], STRING parameter[50])
{
    // Use pre-allocated buffer
    ClearBuffer(command_buffer);
    command_buffer = command + ":" + parameter + "\x0D\x0A";
    
    RETURN command_buffer;
}

// Define appropriate array sizes based on actual requirements
#DEFINE_CONSTANT MAX_DEVICES 32          // Based on system specifications
#DEFINE_CONSTANT MAX_LOG_ENTRIES 100     // Limit log history
#DEFINE_CONSTANT MAX_USER_SESSIONS 8     // Maximum concurrent users

// Use structures for related data
STRUCTURE device_info
{
    STRING name[50];
    STRING ip_address[16];
    DIGITAL online_status;
    INTEGER error_count;
    STRING last_response[100];
};

device_info device_list[MAX_DEVICES];

// Initialize arrays properly
FUNCTION InitializeDeviceArray()
{
    INTEGER i;
    
    FOR (i = 1; i <= MAX_DEVICES; i++)
    {
        device_list[i].name = "";
        device_list[i].ip_address = "0.0.0.0";
        device_list[i].online_status = 0;
        device_list[i].error_count = 0;
        device_list[i].last_response = "";
    }
}

// Use descriptive timer names
WAIT 300 'system_startup_delay' { /* startup code */ }
WAIT 50 'button_debounce_timer' { /* debounce code */ }
WAIT 1800 'auto_shutdown_timer' { /* shutdown code */ }

// Always cancel timers when they're no longer needed
FUNCTION CancelAllSystemTimers()
{
    CANCELWAIT 'system_startup_delay';
    CANCELWAIT 'device_polling_timer';
    CANCELWAIT 'auto_shutdown_timer';
    CANCELWAIT 'user_interface_update';
}

// Use timer management for recurring tasks
FUNCTION StartDevicePolling()
{
    // Cancel existing timer first
    CANCELWAIT 'device_polling_timer';
    
    // Start new polling cycle
    WAIT DEVICE_POLL_INTERVAL 'device_polling_timer'
    {
        PollAllDevices();
        
        // Restart timer for continuous polling
        StartDevicePolling();
    }
}

// Implement timer cleanup on system shutdown
FUNCTION SystemShutdownCleanup()
{
    LogInfo("Beginning system shutdown cleanup");
    
    // Cancel all active timers
    CancelAllSystemTimers();
    
    // Close file handles
    CloseAllLogFiles();
    
    // Close network connections
    CloseAllNetworkConnections();
    
    LogInfo("System shutdown cleanup completed");
}

// Create timer pool for frequently used short timers
#DEFINE_CONSTANT TIMER_POOL_SIZE 10
DIGITAL timer_pool_available[TIMER_POOL_SIZE];
INTEGER next_available_timer;

FUNCTION INTEGER GetAvailableTimer()
{
    INTEGER i;
    
    // Find next available timer in pool
    FOR (i = 1; i <= TIMER_POOL_SIZE; i++)
    {
        IF (timer_pool_available[i] = 1)
        {
            timer_pool_available[i] = 0; // Mark as used
            RETURN i;
        }
    }
    
    // No timers available
    LogWarning("Timer pool exhausted");
    RETURN 0;
}

FUNCTION ReleaseTimer(INTEGER timer_id)
{
    IF (timer_id >= 1 AND timer_id <= TIMER_POOL_SIZE)
    {
        CANCELWAIT 'pool_timer_' + ITOA(timer_id);
        timer_pool_available[timer_id] = 1; // Mark as available
    }
}

// Connection state tracking
STRUCTURE network_connection
{
    STRING ip_address[16];
    INTEGER port;
    DIGITAL connected;
    INTEGER connection_id;
    STRING last_activity[30];
};

network_connection tcp_connections[MAX_TCP_CONNECTIONS];

FUNCTION INTEGER OpenNetworkConnection(STRING ip[16], INTEGER port)
{
    INTEGER connection_slot;
    
    // Find available connection slot
    connection_slot = FindAvailableConnectionSlot();
    
    IF (connection_slot = 0)
    {
        LogError("No available connection slots");
        RETURN 0;
    }
    
    // Configure connection
    tcp_connections[connection_slot].ip_address = ip;
    tcp_connections[connection_slot].port = port;
    tcp_connections[connection_slot].connected = 0;
    
    // Initiate connection
    tcp_client_connect[connection_slot] = 1;
    
    // Set timeout for connection attempt
    WAIT CONNECTION_TIMEOUT 'connection_timeout_' + ITOA(connection_slot)
    {
        // Connection timeout
        LogError("Connection timeout: " + ip + ":" + ITOA(port));
        ReleaseConnectionSlot(connection_slot);
    }
    
    RETURN connection_slot;
}

// Handle successful connection
WHEN (tcp_client_status[connection_slot] = ON)
{
    CANCELWAIT 'connection_timeout_' + ITOA(connection_slot);
    
    tcp_connections[connection_slot].connected = 1;
    tcp_connections[connection_slot].last_activity = GetCurrentTime();
    
    LogInfo("Connected to: " + tcp_connections[connection_slot].ip_address);
}

// Clean up closed connections
WHEN (tcp_client_status[connection_slot] = OFF)
{
    IF (tcp_connections[connection_slot].connected = 1)
    {
        LogInfo("Connection closed: " + tcp_connections[connection_slot].ip_address);
        ReleaseConnectionSlot(connection_slot);
    }
}

FUNCTION ReleaseConnectionSlot(INTEGER slot)
{
    // Clear connection data
    tcp_connections[slot].ip_address = "";
    tcp_connections[slot].port = 0;
    tcp_connections[slot].connected = 0;
    tcp_connections[slot].connection_id = 0;
    
    // Cancel any pending timers
    CANCELWAIT 'connection_timeout_' + ITOA(slot);
}

// File handle tracking
#DEFINE_CONSTANT MAX_OPEN_FILES 5
STRING open_file_names[MAX_OPEN_FILES][50];
SIGNED_LONG_INTEGER file_handles[MAX_OPEN_FILES];

FUNCTION SIGNED_LONG_INTEGER SafeFileOpen(STRING filename[50], INTEGER mode)
{
    SIGNED_LONG_INTEGER file_handle;
    INTEGER slot;
    
    // Find available file slot
    slot = FindAvailableFileSlot();
    
    IF (slot = 0)
    {
        LogError("Maximum open files reached");
        RETURN -1;
    }
    
    // Open file
    file_handle = FILEOPEN(filename, mode);
    
    IF (file_handle >= 0)
    {
        // Track opened file
        file_handles[slot] = file_handle;
        open_file_names[slot] = filename;
        
        LogInfo("File opened: " + filename);
    }
    ELSE
    {
        LogError("Failed to open file: " + filename);
    }
    
    RETURN file_handle;
}

FUNCTION SafeFileClose(SIGNED_LONG_INTEGER file_handle)
{
    INTEGER slot;
    STRING filename[50];
    
    // Find file slot
    slot = FindFileSlot(file_handle);
    
    IF (slot > 0)
    {
        filename = open_file_names[slot];
        
        // Close file
        FILECLOSE(file_handle);
        
        // Clear tracking
        file_handles[slot] = -1;
        open_file_names[slot] = "";
        
        LogInfo("File closed: " + filename);
    }
}

// Emergency cleanup function
FUNCTION CloseAllOpenFiles()
{
    INTEGER i;
    
    FOR (i = 1; i <= MAX_OPEN_FILES; i++)
    {
        IF (file_handles[i] >= 0)
        {
            LogWarning("Force closing file: " + open_file_names[i]);
            FILECLOSE(file_handles[i]);
            file_handles[i] = -1;
            open_file_names[i] = "";
        }
    }
}

// Simple testing framework for AV programming
#DEFINE_CONSTANT TEST_PASS 1
#DEFINE_CONSTANT TEST_FAIL 0

DIGITAL test_results[100];  // Track test results
INTEGER test_count;
INTEGER passed_tests;
INTEGER failed_tests;

FUNCTION INTEGER RunTest(STRING test_name[100], DIGITAL expected_result, DIGITAL actual_result)
{
    test_count = test_count + 1;
    
    IF (expected_result = actual_result)
    {
        test_results[test_count] = TEST_PASS;
        passed_tests = passed_tests + 1;
        LogInfo("TEST PASS: " + test_name);
        RETURN TEST_PASS;
    }
    ELSE
    {
        test_results[test_count] = TEST_FAIL;
        failed_tests = failed_tests + 1;
        LogError("TEST FAIL: " + test_name + 
                " (Expected: " + ITOA(expected_result) + 
                ", Actual: " + ITOA(actual_result) + ")");
        RETURN TEST_FAIL;
    }
}

// Example unit tests for volume control function
FUNCTION RunVolumeControlTests()
{
    INTEGER result;
    
    LogInfo("Starting Volume Control Unit Tests");
    
    // Test valid volume levels
    result = SetVolumeLevel(50);
    RunTest("Set volume to 50%", TEST_PASS, result);
    RunTest("Volume level feedback", 50, GetCurrentVolumeLevel());
    
    // Test boundary conditions
    result = SetVolumeLevel(0);
    RunTest("Set volume to minimum (0%)", TEST_PASS, result);
    
    result = SetVolumeLevel(100);
    RunTest("Set volume to maximum (100%)", TEST_PASS, result);
    
    // Test invalid inputs
    result = SetVolumeLevel(-10);
    RunTest("Reject negative volume", TEST_FAIL, result);
    
    result = SetVolumeLevel(150);
    RunTest("Reject volume above maximum", TEST_FAIL, result);
    
    LogInfo("Volume Control Unit Tests Completed");
}

FUNCTION TestAudioControlModule()
{
    LogInfo("Testing Audio Control Module");
    
    // Initialize test environment
    InitializeTestEnvironment();
    
    // Test module initialization
    InitializeAudioSystem();
    RunTest("Audio system initialization", 1, IsAudioSystemReady());
    
    // Test zone control
    SetZoneVolume(1, 75);
    RunTest("Set zone 1 volume", 75, GetZoneVolume(1));
    
    // Test mute functionality
    MuteZone(1);
    RunTest("Mute zone 1", 1, IsZoneMuted(1));
    
    UnmuteZone(1);
    RunTest("Unmute zone 1", 0, IsZoneMuted(1));
    
    // Test error conditions
    result = SetZoneVolume(999, 50); // Invalid zone
    RunTest("Invalid zone rejection", 0, result);
    
    // Cleanup test environment
    CleanupTestEnvironment();
    
    LogInfo("Audio Control Module Testing Complete");
}

FUNCTION RunSystemIntegrationTests()
{
    LogInfo("Starting System Integration Tests");
    
    // Test 1: Power-up sequence
    LogInfo("Integration Test 1: System Power-Up Sequence");
    SystemPowerOn();
    
    WAIT 100 'power_test_delay' // Wait for systems to initialize
    {
        RunTest("Projector powered on", 1, IsProjectorOn());
        RunTest("Audio system ready", 1, IsAudioSystemReady());
        RunTest("Lighting system responsive", 1, IsLightingSystemReady());
        RunTest("User interface active", 1, IsUserInterfaceActive());
        
        // Test 2: Source switching sequence
        LogInfo("Integration Test 2: Source Switching");
        SelectSource(1); // Laptop input
        
        WAIT 30 'source_switch_delay'
        {
            RunTest("Video switcher input 1", 1, GetCurrentVideoInput());
            RunTest("Audio routing to input 1", 1, GetCurrentAudioInput());
            RunTest("UI shows input 1 selected", 1, IsInputSelected(1));
            
            // Test 3: Preset activation
            LogInfo("Integration Test 3: Preset Activation");
            ActivatePreset(PRESENTATION_PRESET);
            
            WAIT 50 'preset_test_delay'
            {
                RunTest("Lighting at presentation level", PRESENTATION_LIGHT_LEVEL, GetLightingLevel());
                RunTest("Audio at presentation level", PRESENTATION_AUDIO_LEVEL, GetVolumeLevel());
                RunTest("Projector brightness adjusted", PRESENTATION_BRIGHTNESS, GetProjectorBrightness());
                
                // Complete integration tests
                DisplayTestResults();
            }
        }
    }
}

FUNCTION RunLoadTests()
{
    INTEGER i;
    
    LogInfo("Starting Load Testing");
    
    // Test rapid button presses
    LogInfo("Load Test 1: Rapid User Input");
    FOR (i = 1; i <= 100; i++)
    {
        SimulateButtonPress(VOLUME_UP_BUTTON);
        WAIT 5 'rapid_input_delay_' + ITOA(i)
        {
            // Check system responsiveness
        }
    }
    
    // Test concurrent operations
    LogInfo("Load Test 2: Concurrent Operations");
    TriggerConcurrentOperations();
    
    // Test memory usage over time
    LogInfo("Load Test 3: Extended Operation");
    StartExtendedOperationTest();
}

FUNCTION TriggerConcurrentOperations()
{
    // Simulate multiple simultaneous actions
    PULSE(projector_power_toggle);
    PULSE(audio_mute_toggle);
    volume_level = 75;
    lighting_level = 50;
    SelectSource(3);
    
    // Monitor system response times
    start_time = GetSystemTime();
    
    WAIT 100 'concurrent_test_timeout'
    {
        end_time = GetSystemTime();
        response_time = end_time - start_time;
        
        RunTest("Concurrent operation response time", 1, (response_time < MAX_RESPONSE_TIME));
        LogInfo("Response time: " + ITOA(response_time) + "ms");
    }
}

// Test configuration structure
STRUCTURE test_case
{
    STRING name[100];
    INTEGER test_id;
    DIGITAL enabled;
    INTEGER timeout_seconds;
};

test_case system_tests[50];
INTEGER total_tests;

FUNCTION InitializeTestSuite()
{
    total_tests = 0;
    
    // Define test cases
    AddTestCase("System Power On", 1, 1, 30);
    AddTestCase("Device Communications", 2, 1, 20);
    AddTestCase("User Interface Response", 3, 1, 10);
    AddTestCase("Audio Control Functions", 4, 1, 15);
    AddTestCase("Video Switching", 5, 1, 15);
    AddTestCase("Lighting Control", 6, 1, 10);
    AddTestCase("Preset Management", 7, 1, 20);
    AddTestCase("Error Recovery", 8, 1, 25);
}

FUNCTION AddTestCase(STRING name[100], INTEGER id, DIGITAL enabled, INTEGER timeout)
{
    total_tests = total_tests + 1;
    
    system_tests[total_tests].name = name;
    system_tests[total_tests].test_id = id;
    system_tests[total_tests].enabled = enabled;
    system_tests[total_tests].timeout_seconds = timeout;
}

FUNCTION RunAutomatedTestSuite()
{
    INTEGER i;
    
    LogInfo("Starting Automated Test Suite");
    LogInfo("Total Tests: " + ITOA(total_tests));
    
    // Reset counters
    test_count = 0;
    passed_tests = 0;
    failed_tests = 0;
    
    // Run each enabled test
    FOR (i = 1; i <= total_tests; i++)
    {
        IF (system_tests[i].enabled = 1)
        {
            LogInfo("Running Test: " + system_tests[i].name);
            ExecuteTestCase(system_tests[i]);
        }
        ELSE
        {
            LogInfo("Skipping Test: " + system_tests[i].name + " (disabled)");
        }
    }
    
    // Generate test report
    GenerateTestReport();
}

FUNCTION ExecuteTestCase(test_case current_test)
{
    // Set timeout for test execution
    WAIT (current_test.timeout_seconds * 10) 'test_timeout'
    {
        LogError("Test timeout: " + current_test.name);
        RunTest(current_test.name, TEST_PASS, TEST_FAIL);
    }
    
    // Execute specific test based on ID
    SWITCH (current_test.test_id)
    {
        CASE 1: TestSystemPowerOn(); BREAK;
        CASE 2: TestDeviceCommunications(); BREAK;
        CASE 3: TestUserInterfaceResponse(); BREAK;
        CASE 4: TestAudioControlFunctions(); BREAK;
        CASE 5: TestVideoSwitching(); BREAK;
        CASE 6: TestLightingControl(); BREAK;
        CASE 7: TestPresetManagement(); BREAK;
        CASE 8: TestErrorRecovery(); BREAK;
        DEFAULT: LogError("Unknown test ID: " + ITOA(current_test.test_id));
    }
    
    // Cancel timeout timer
    CANCELWAIT 'test_timeout';
}

FUNCTION GenerateTestReport()
{
    STRING report_header[200];
    STRING report_summary[200];
    STRING report_details[2000];
    STRING timestamp[50];
    
    timestamp = GetFormattedTime();
    
    // Create report header
    report_header = "=== AV System Test Report ===\n";
    report_header = report_header + "Generated: " + timestamp + "\n";
    report_header = report_header + "System: " + SYSTEM_NAME + "\n\n";
    
    // Create summary
    report_summary = "Test Summary:\n";
    report_summary = report_summary + "Total Tests: " + ITOA(test_count) + "\n";
    report_summary = report_summary + "Passed: " + ITOA(passed_tests) + "\n";
    report_summary = report_summary + "Failed: " + ITOA(failed_tests) + "\n";
    
    IF (failed_tests = 0)
    {
        report_summary = report_summary + "Result: ALL TESTS PASSED\n\n";
    }
    ELSE
    {
        report_summary = report_summary + "Result: " + ITOA(failed_tests) + " TEST(S) FAILED\n\n";
    }
    
    // Save report to file
    SaveTestReport(report_header + report_summary + report_details);
    
    // Display summary on user interface
    DisplayTestSummary(passed_tests, failed_tests);
    
    LogInfo("Test report generated: " + ITOA(passed_tests) + " passed, " + ITOA(failed_tests) + " failed");
}

av-project-repo/
├── README.md                     # Project overview and setup instructions
├── CHANGELOG.md                  # Version history and changes
├── .gitignore                    # Files to exclude from version control
├── src/                         # Source code
│   ├── main/
│   │   ├── control_logic.umc
│   │   ├── system_config.cfg
│   │   └── device_modules/
│   │       ├── audio_dsp.umc
│   │       ├── video_switcher.umc
│   │       └── lighting.umc
│   ├── interfaces/
│   │   ├── main_panel.vtz
│   │   ├── mobile_ui.html
│   │   └── web_interface/
│   └── tests/
│       ├── unit_tests.umc
│       └── integration_tests.umc
├── docs/                        # Documentation
│   ├── system_design.md
│   ├── installation_guide.md
│   ├── user_manual.pdf
│   └── api_documentation.md
├── config/                      # Environment-specific configurations
│   ├── development.cfg
│   ├── staging.cfg
│   └── production.cfg
├── scripts/                     # Build and deployment scripts
│   ├── build.sh
│   ├── deploy.sh
│   └── backup.sh
└── releases/                    # Compiled releases
    ├── v1.0.0/
    ├── v1.1.0/
    └── v2.0.0/

[object Object],
main          ,[object Object],
develop       ,[object Object],

,[object Object],
feature/audio-enhancements
feature/new-touch-panel-ui
feature/lighting-presets

,[object Object],
release/v2.1.0
release/v2.2.0

,[object Object],
hotfix/projector-connection-fix
hotfix/volume-control-bug

[object Object],
feature/component-description
feature/audio-zone-control
feature/video-wall-support
feature/user-authentication

,[object Object],
bugfix/issue-description
bugfix/volume-slider-freeze
bugfix/display-timeout-error

,[object Object],
hotfix/critical-issue-description
hotfix/system-crash-on-startup
hotfix/network-timeout-handling

,[object Object],
staging/integration-testing
production/live-deployment

<type>(<scope>): <short description>

<detailed description>

<footer>

[object Object],
feat(audio): Add multi-zone volume control
feat(ui): Implement new ,[object Object], panel layout
feat(lighting): Add preset management system

,[object Object],
fix(video): Resolve HDCP handshake ,[object Object], issues
fix(control): Fix system freeze during startup sequence
fix(network): Handle device disconnection gracefully

,[object Object],
config(network): Update IP addresses ,[object Object], new switches
config(devices): Add support ,[object Object], new projector models
config(system): Adjust ,[object Object], values ,[object Object], stability

,[object Object],
docs(install): Update installation procedures
docs(api): Add device communication protocol docs
docs(user): Create troubleshooting guide

feat(audio): Implement automatic gain control system

- Add AGC module for microphone inputs
- Implement noise gate functionality
- Add user configurable sensitivity settings
- Include bypass option for advanced users

The AGC system automatically adjusts microphone levels to maintain
consistent audio levels during presentations and meetings. This addresses
client requirements for hands-free audio management.

Resolves: #123
Tested-by: John Smith <john.smith@company.com>

[object Object],

,[object Object],
Brief description of changes and why they were made.

,[object Object],
,[object Object], [ ] Bug fix (non-breaking change that fixes an issue)
,[object Object], [ ] New feature (non-breaking change that adds functionality)
,[object Object], [ ] Breaking change (fix or feature that would cause existing functionality to change)
,[object Object], [ ] Documentation update

,[object Object],
,[object Object], [ ] Unit tests pass
,[object Object], [ ] Integration tests pass
,[object Object], [ ] Manual testing completed
,[object Object], [ ] Performance impact assessed

,[object Object],
,[object Object], [ ] Tested with actual AV equipment
,[object Object], [ ] Verified on target control processor
,[object Object], [ ] Network communication tested
,[object Object], [ ] User interface tested on touch panels

,[object Object],
,[object Object], [ ] Code follows project style guidelines
,[object Object], [ ] Self-review completed
,[object Object], [ ] Code is commented appropriately
,[object Object], [ ] Documentation updated
,[object Object], [ ] No sensitive information included

,[object Object],
Special considerations for deployment or configuration changes.

,[object Object],
If applicable, add screenshots or videos demonstrating the changes.

[object Object],

,[object Object],
,[object Object], [ ] Code accomplishes intended purpose
,[object Object], [ ] Edge cases handled appropriately
,[object Object], [ ] Error conditions handled gracefully
,[object Object], [ ] Resource management is proper

,[object Object],
,[object Object], [ ] Code is readable and well-organized
,[object Object], [ ] Functions have single responsibilities
,[object Object], [ ] Variable names are descriptive
,[object Object], [ ] Comments explain complex logic

,[object Object],
,[object Object], [ ] Device communication is robust
,[object Object], [ ] Timing considerations addressed
,[object Object], [ ] User interface is intuitive
,[object Object], [ ] System performance impact minimal

,[object Object],
,[object Object], [ ] No hardcoded credentials
,[object Object], [ ] Input validation present
,[object Object], [ ] Network security considered
,[object Object], [ ] Access controls appropriate

,[object Object],
,[object Object], [ ] Adequate test coverage
,[object Object], [ ] Tests are meaningful
,[object Object], [ ] Manual testing documented
,[object Object], [ ] Performance benchmarks met

[object Object],

,[object Object],
,[object Object], [ ] All unit tests pass
,[object Object], [ ] Integration tests complete
,[object Object], [ ] Load testing completed
,[object Object], [ ] Security testing performed
,[object Object], [ ] Hardware compatibility verified

,[object Object],
,[object Object], [ ] CHANGELOG.md updated
,[object Object], [ ] Version numbers updated
,[object Object], [ ] Release notes prepared
,[object Object], [ ] Installation guide reviewed
,[object Object], [ ] User documentation updated

,[object Object],
,[object Object], [ ] Release build created
,[object Object], [ ] All components included
,[object Object], [ ] Configuration files updated
,[object Object], [ ] Dependencies documented

,[object Object],
,[object Object], [ ] Rollback plan prepared
,[object Object], [ ] Maintenance window scheduled
,[object Object], [ ] Stakeholders notified
,[object Object], [ ] Support team briefed

v1.0.0 - Initial release
v1.1.0 - Added lighting control features  
v1.1.1 - Fixed volume control bug
v1.2.0 - Added preset management
v2.0.0 - Major UI redesign (breaking changes)

// development.cfg
#DEFINE_CONSTANT SYSTEM_ENVIRONMENT "DEVELOPMENT"
#DEFINE_CONSTANT DEBUG_MODE 1
#DEFINE_CONSTANT LOG_LEVEL 4              // Verbose logging
#DEFINE_CONSTANT DEVICE_TIMEOUT 100       // 10 second timeout

// staging.cfg  
#DEFINE_CONSTANT SYSTEM_ENVIRONMENT "STAGING"
#DEFINE_CONSTANT DEBUG_MODE 1
#DEFINE_CONSTANT LOG_LEVEL 2              // Warning and above
#DEFINE_CONSTANT DEVICE_TIMEOUT 50        // 5 second timeout

// production.cfg
#DEFINE_CONSTANT SYSTEM_ENVIRONMENT "PRODUCTION"
#DEFINE_CONSTANT DEBUG_MODE 0
#DEFINE_CONSTANT LOG_LEVEL 1              // Errors only
#DEFINE_CONSTANT DEVICE_TIMEOUT 30        // 3 second timeout

[object Object],

,[object Object],
,[object Object], Updated projector IP addresses for Room A-101
,[object Object], Added new display model configuration
,[object Object], Increased audio timeout from 3s to 5s

,[object Object],
,[object Object], Fixed typo in device name configuration
,[object Object], Updated network VLAN settings
,[object Object], Added backup server configuration

,[object Object],
,[object Object], Major configuration restructuring
,[object Object], Separated development/staging/production configs
,[object Object], Added environment-specific timeouts

// Immediate visual feedback for user actions
WHEN (button_press[button_id])
{
    // Provide instant visual feedback
    button_feedback[button_id] = 1;
    
    // Process action without blocking interface
    ProcessButtonActionAsync(button_id);
}

// Asynchronous action processing
FUNCTION ProcessButtonActionAsync(INTEGER button_id)
{
    // Don't block the user interface while processing
    WAIT 1 'async_process_' + ITOA(button_id)
    {
        SWITCH (button_id)
        {
            CASE POWER_BUTTON:
                HandlePowerToggle();
                BREAK;
                
            CASE VOLUME_UP:
                AdjustVolumeUp();
                BREAK;
                
            CASE SOURCE_SELECT:
                HandleSourceSelection();
                BREAK;
        }
        
        // Clear feedback after action completes
        button_feedback[button_id] = 0;
    }
}

// Optimize frequent operations
FUNCTION AdjustVolumeUp()
{
    // Cache current volume to avoid reading from device
    IF (cached_volume_valid = 1)
    {
        // Use cached value for immediate response
        new_volume = cached_volume_level + VOLUME_STEP;
    }
    ELSE
    {
        // Fall back to device query if cache invalid
        new_volume = GetDeviceVolume() + VOLUME_STEP;
    }
    
    // Validate and apply new volume
    IF (new_volume <= MAX_VOLUME_LEVEL)
    {
        SetVolumeLevel(new_volume);
        UpdateVolumeDisplay(new_volume);
    }
}

// Batch commands to reduce network traffic
FUNCTION SendBatchedCommands()
{
    STRING command_batch[1000];
    
    // Build single command string with multiple operations
    command_batch = "PWR1;INPUT3;VOL50;BRIGHT75\x0D\x0A";
    
    // Send all commands in one transaction
    device_command_output = command_batch;
    
    // More efficient than multiple individual commands:
    // device_command_output = "PWR1\x0D\x0A";
    // device_command_output = "INPUT3\x0D\x0A";
    // device_command_output = "VOL50\x0D\x0A";
    // device_command_output = "BRIGHT75\x0D\x0A";
}

// Implement command queuing for busy devices
STRUCTURE command_queue_item
{
    STRING command[100];
    INTEGER priority;
    STRING timestamp[30];
};

command_queue_item command_queue[50];
INTEGER queue_head, queue_tail, queue_size;

FUNCTION QueueCommand(STRING command[100], INTEGER priority)
{
    // Add command to queue if space available
    IF (queue_size < 50)
    {
        queue_tail = queue_tail + 1;
        IF (queue_tail > 50) queue_tail = 1;
        
        command_queue[queue_tail].command = command;
        command_queue[queue_tail].priority = priority;
        command_queue[queue_tail].timestamp = GetCurrentTime();
        
        queue_size = queue_size + 1;
        
        // Process queue if device is ready
        ProcessCommandQueue();
    }
}

FUNCTION ProcessCommandQueue()
{
    // Only send commands if device is ready and queue has items
    IF (device_ready = 1 AND queue_size > 0)
    {
        // Send highest priority command
        device_command_output = GetNextQueuedCommand();
        device_ready = 0; // Mark device as busy
        
        // Set timeout for device response
        WAIT DEVICE_RESPONSE_TIMEOUT 'command_timeout'
        {
            // Handle timeout
            device_ready = 1;
            ProcessCommandQueue(); // Continue processing queue
        }
    }
}

// Pre-allocate buffers for frequently used strings
STRING work_buffer[500];
STRING status_buffer[200];
STRING command_buffer[100];

// Avoid creating temporary strings in loops
FUNCTION ProcessDeviceList()
{
    INTEGER i;
    
    // Bad: Creates new strings in each iteration
    // FOR (i = 1; i <= device_count; i++)
    // {
    //     temp_string = "Device " + ITOA(i) + " Status";
    //     QueryDeviceStatus(temp_string);
    // }
    
    // Good: Reuse buffer
    FOR (i = 1; i <= device_count; i++)
    {
        // Clear and reuse buffer
        ClearBuffer(work_buffer);
        work_buffer = "Device " + ITOA(i) + " Status";
        QueryDeviceStatus(work_buffer);
    }
}

// Implement string pooling for common strings
#DEFINE_CONSTANT STRING_POOL_SIZE 20
STRING string_pool[STRING_POOL_SIZE][100];
DIGITAL string_pool_used[STRING_POOL_SIZE];

FUNCTION STRING GetPooledString(STRING content[100])
{
    INTEGER i;
    
    // Look for existing string in pool
    FOR (i = 1; i <= STRING_POOL_SIZE; i++)
    {
        IF (string_pool_used[i] = 1 AND string_pool[i] = content)
        {
            RETURN string_pool[i];
        }
    }
    
    // Find available slot for new string
    FOR (i = 1; i <= STRING_POOL_SIZE; i++)
    {
        IF (string_pool_used[i] = 0)
        {
            string_pool[i] = content;
            string_pool_used[i] = 1;
            RETURN string_pool[i];
        }
    }
    
    // Pool full - return direct reference
    RETURN content;
}

// Use appropriate data types
STRUCTURE efficient_device_info
{
    STRING name[30];          // Limit to actual needs, not excessive
    STRING ip[16];            // Exact size for IP addresses
    DIGITAL online;           // Use DIGITAL for boolean values
    INTEGER error_count;      // Use INTEGER for counters
    ANALOG volume_level;      // Use ANALOG for ranges
};

// Avoid oversized arrays
// Bad: device_info devices[1000];  // Wastes memory if only 10 devices
// Good: device_info devices[MAX_SYSTEM_DEVICES]; // Based on actual requirements

// Implement connection pooling
#DEFINE_CONSTANT CONNECTION_POOL_SIZE 8
STRUCTURE connection_pool_item
{
    STRING device_ip[16];
    INTEGER connection_id;
    DIGITAL in_use;
    STRING last_activity[30];
};

connection_pool_item connection_pool[CONNECTION_POOL_SIZE];

FUNCTION INTEGER GetPooledConnection(STRING ip[16])
{
    INTEGER i;
    
    // Look for existing connection to this IP
    FOR (i = 1; i <= CONNECTION_POOL_SIZE; i++)
    {
        IF (connection_pool[i].device_ip = ip AND 
            connection_pool[i].in_use = 0)
        {
            connection_pool[i].in_use = 1;
            connection_pool[i].last_activity = GetCurrentTime();
            RETURN connection_pool[i].connection_id;
        }
    }
    
    // Create new connection if pool has space
    FOR (i = 1; i <= CONNECTION_POOL_SIZE; i++)
    {
        IF (connection_pool[i].connection_id = 0)
        {
            // Initialize new connection
            connection_pool[i].connection_id = OpenConnection(ip);
            connection_pool[i].device_ip = ip;
            connection_pool[i].in_use = 1;
            connection_pool[i].last_activity = GetCurrentTime();
            RETURN connection_pool[i].connection_id;
        }
    }
    
    // Pool exhausted
    RETURN 0;
}

// Implement intelligent polling
FUNCTION OptimizedDevicePolling()
{
    INTEGER i;
    
    FOR (i = 1; i <= device_count; i++)
    {
        // Adjust polling frequency based on device importance and activity
        IF (device_list[i].critical_device = 1)
        {
            // Poll critical devices more frequently
            IF (GetTimeSinceLastPoll(i) > CRITICAL_POLL_INTERVAL)
            {
                PollDevice(i);
            }
        }
        ELSE
        {
            // Poll non-critical devices less frequently
            IF (GetTimeSinceLastPoll(i) > STANDARD_POLL_INTERVAL)
            {
                PollDevice(i);
            }
        }
        
        // Skip polling for offline devices
        IF (device_list[i].online = 0 AND 
            GetTimeSinceLastPoll(i) < OFFLINE_POLL_INTERVAL)
        {
            CONTINUE; // Skip this device
        }
    }
    
    // Schedule next polling cycle
    WAIT POLLING_CYCLE_TIME 'device_polling_timer'
    {
        OptimizedDevicePolling();
    }
}

// Implement smart UI updates - only update when values change
ANALOG previous_volume_level;
ANALOG previous_lighting_level;
STRING previous_source_name[50];

FUNCTION UpdateUserInterface()
{
    // Only update volume display if value changed
    IF (current_volume_level <> previous_volume_level)
    {
        volume_slider_position = current_volume_level;
        volume_text_display = ITOA(current_volume_level) + "%";
        previous_volume_level = current_volume_level;
    }
    
    // Only update lighting display if value changed
    IF (current_lighting_level <> previous_lighting_level)
    {
        lighting_slider_position = current_lighting_level;
        lighting_text_display = ITOA(current_lighting_level) + "%";
        previous_lighting_level = current_lighting_level;
    }
    
    // Only update source name if changed
    IF (current_source_name <> previous_source_name)
    {
        source_name_text = current_source_name;
        previous_source_name = current_source_name;
    }
}

// Batch UI updates to reduce processing overhead
DIGITAL ui_update_pending;

FUNCTION TriggerUIUpdate()
{
    // Set flag for pending update
    ui_update_pending = 1;
    
    // Batch updates with small delay
    CANCELWAIT 'ui_update_timer';
    WAIT 5 'ui_update_timer' // 500ms delay for batching
    {
        IF (ui_update_pending = 1)
        {
            UpdateUserInterface();
            ui_update_pending = 0;
        }
    }
}

// Use secure communication channels
#DEFINE_CONSTANT USE_SSL_TLS 1
#DEFINE_CONSTANT REQUIRE_AUTHENTICATION 1
#DEFINE_CONSTANT SESSION_TIMEOUT 1800 // 30 minutes

// Implement certificate validation
FUNCTION INTEGER EstablishSecureConnection(STRING device_ip[16], INTEGER port)
{
    INTEGER connection_result;
    
    // Enable SSL/TLS for secure communication
    tcp_client_ssl_enable[device_ip] = USE_SSL_TLS;
    
    // Configure certificate validation
    tcp_client_certificate_verification[device_ip] = 1;
    
    // Set secure port
    tcp_client_port[device_ip] = port;
    
    // Initiate secure connection
    tcp_client_connect[device_ip] = 1;
    
    // Set connection timeout
    WAIT CONNECTION_TIMEOUT 'secure_connect_' + device_ip
    {
        LogError("Secure connection timeout: " + device_ip);
        RETURN 0; // Connection failed
    }
    
    RETURN 1; // Connection initiated
}

// Validate certificates
WHEN (tcp_client_certificate_error[device_ip])
{
    LogError("Certificate validation failed: " + device_ip);
    
    // Close insecure connection
    tcp_client_connect[device_ip] = 0;
    
    // Notify security monitoring system
    ReportSecurityEvent("Certificate validation failed", device_ip);
    
    // Update device status
    device_security_status[device_ip] = SECURITY_FAILED;
}

// User authentication structure
STRUCTURE user_session
{
    STRING username[50];
    STRING session_id[64];
    INTEGER access_level;
    STRING creation_time[30];
    STRING last_activity[30];
    DIGITAL active;
};

user_session active_sessions[MAX_CONCURRENT_SESSIONS];

FUNCTION INTEGER AuthenticateUser(STRING username[50], STRING password[100])
{
    STRING hashed_password[128];
    INTEGER user_index;
    
    // Input validation
    IF (LEN(username) = 0 OR LEN(password) = 0)
    {
        LogSecurityEvent("Authentication attempt with empty credentials");
        RETURN 0; // Authentication failed
    }
    
    // Hash password for comparison (never store plaintext passwords)
    hashed_password = HashPassword(password, SALT_VALUE);
    
    // Look up user in secure credential store
    user_index = LookupUser(username);
    
    IF (user_index > 0)
    {
        // Compare hashed passwords
        IF (user_database[user_index].password_hash = hashed_password)
        {
            // Create session
            session_id = CreateUserSession(username, user_database[user_index].access_level);
            
            LogSecurityEvent("Successful authentication: " + username);
            RETURN session_id;
        }
        ELSE
        {
            // Record failed attempt
            RecordFailedLogin(username);
            LogSecurityEvent("Failed authentication: " + username);
        }
    }
    
    // Authentication failed
    RETURN 0;
}

// Implement role-based access control
#DEFINE_CONSTANT ACCESS_LEVEL_GUEST 1
#DEFINE_CONSTANT ACCESS_LEVEL_USER 2
#DEFINE_CONSTANT ACCESS_LEVEL_ADMIN 3
#DEFINE_CONSTANT ACCESS_LEVEL_SYSTEM 4

FUNCTION DIGITAL CheckPermission(INTEGER session_id, INTEGER required_level)
{
    INTEGER user_level;
    
    // Get user access level from session
    user_level = GetUserAccessLevel(session_id);
    
    // Check if user has sufficient privileges
    IF (user_level >= required_level)
    {
        // Update session activity
        UpdateSessionActivity(session_id);
        RETURN 1; // Permission granted
    }
    ELSE
    {
        // Log unauthorized access attempt
        LogSecurityEvent("Insufficient privileges for operation", 
                        GetUsernameFromSession(session_id));
        RETURN 0; // Permission denied
    }
}

// Secure function execution
FUNCTION ExecuteSecureOperation(INTEGER session_id, STRING operation[100])
{
    // Verify session is valid and active
    IF (ValidateSession(session_id) = 0)
    {
        LogSecurityEvent("Invalid session attempted operation: " + operation);
        RETURN;
    }
    
    // Check specific permissions based on operation
    SWITCH (operation)
    {
        CASE "SYSTEM_POWER":
            IF (CheckPermission(session_id, ACCESS_LEVEL_USER) = 0) RETURN;
            BREAK;
            
        CASE "SYSTEM_CONFIG":
            IF (CheckPermission(session_id, ACCESS_LEVEL_ADMIN) = 0) RETURN;
            BREAK;
            
        CASE "SECURITY_SETTINGS":
            IF (CheckPermission(session_id, ACCESS_LEVEL_SYSTEM) = 0) RETURN;
            BREAK;
            
        DEFAULT:
            LogSecurityEvent("Unknown operation attempted: " + operation);
            RETURN;
    }
    
    // Execute authorized operation
    ProcessSecureOperation(operation);
    
    // Log successful operation
    LogSecurityEvent("Operation executed: " + operation, 
                    GetUsernameFromSession(session_id));
}

// Comprehensive input validation
FUNCTION DIGITAL ValidateIPAddress(STRING ip_input[16])
{
    INTEGER i, octet_count, current_octet;
    STRING temp_octet[4];
    
    // Check basic format
    IF (LEN(ip_input) < 7 OR LEN(ip_input) > 15)
    {
        LogSecurityEvent("Invalid IP address format: " + ip_input);
        RETURN 0;
    }
    
    octet_count = 1;
    temp_octet = "";
    
    // Parse and validate each octet
    FOR (i = 1; i <= LEN(ip_input); i++)
    {
        IF (MID(ip_input, i, 1) = ".")
        {
            // Validate current octet
            current_octet = ATOI(temp_octet);
            IF (current_octet < 0 OR current_octet > 255)
            {
                LogSecurityEvent("Invalid IP octet value: " + temp_octet);
                RETURN 0;
            }
            
            octet_count = octet_count + 1;
            temp_octet = "";
        }
        ELSE
        {
            // Check for valid numeric characters
            IF (MID(ip_input, i, 1) < "0" OR MID(ip_input, i, 1) > "9")
            {
                LogSecurityEvent("Invalid character in IP address: " + ip_input);
                RETURN 0;
            }
            
            temp_octet = temp_octet + MID(ip_input, i, 1);
        }
    }
    
    // Validate final octet
    current_octet = ATOI(temp_octet);
    IF (current_octet < 0 OR current_octet > 255)
    {
        LogSecurityEvent("Invalid final IP octet: " + temp_octet);
        RETURN 0;
    }
    
    // Must have exactly 4 octets
    IF (octet_count <> 4)
    {
        LogSecurityEvent("Invalid IP address structure: " + ip_input);
        RETURN 0;
    }
    
    RETURN 1; // Valid IP address
}

// Sanitize string inputs
FUNCTION STRING SanitizeStringInput(STRING user_input[255])
{
    STRING sanitized_output[255];
    STRING current_char[2];
    INTEGER i;
    
    sanitized_output = "";
    
    FOR (i = 1; i <= LEN(user_input); i++)
    {
        current_char = MID(user_input, i, 1);
        
        // Allow alphanumeric characters, spaces, and safe punctuation
        IF ((current_char >= "A" AND current_char <= "Z") OR
            (current_char >= "a" AND current_char <= "z") OR
            (current_char >= "0" AND current_char <= "9") OR
            current_char = " " OR current_char = "." OR 
            current_char = "-" OR current_char = "_")
        {
            sanitized_output = sanitized_output + current_char;
        }
        ELSE
        {
            // Log potential injection attempt
            LogSecurityEvent("Potentially malicious character removed: " + 
                           ITOHEX(current_char));
        }
    }
    
    // Limit length to prevent buffer overflow
    IF (LEN(sanitized_output) > 200)
    {
        sanitized_output = LEFT(sanitized_output, 200);
        LogSecurityEvent("Input truncated for security");
    }
    
    RETURN sanitized_output;
}

// Validate numeric ranges
FUNCTION DIGITAL ValidateNumericRange(INTEGER value, INTEGER min_value, INTEGER max_value, STRING field_name[50])
{
    IF (value < min_value OR value > max_value)
    {
        LogSecurityEvent("Value out of range for " + field_name + 
                        ": " + ITOA(value) + 
                        " (allowed: " + ITOA(min_value) + 
                        "-" + ITOA(max_value) + ")");
        RETURN 0;
    }
    
    RETURN 1;
}

// Encrypted configuration storage
#DEFINE_CONSTANT CONFIG_ENCRYPTION_KEY "system_config_key_2024"

FUNCTION SaveSecureConfiguration()
{
    STRING config_data[2000];
    STRING encrypted_config[2000];
    
    // Build configuration string
    config_data = "device_passwords=" + device_password_list + ";";
    config_data = config_data + "admin_users=" + admin_user_list + ";";
    config_data = config_data + "network_keys=" + network_key_list + ";";
    
    // Encrypt sensitive data
    encrypted_config = EncryptString(config_data, CONFIG_ENCRYPTION_KEY);
    
    // Save encrypted configuration
    WriteToSecureFile("system_config.enc", encrypted_config);
    
    // Clear plaintext from memory
    ClearString(config_data);
    
    LogSecurityEvent("Secure configuration saved");
}

FUNCTION LoadSecureConfiguration()
{
    STRING encrypted_config[2000];
    STRING decrypted_config[2000];
    
    // Read encrypted configuration
    encrypted_config = ReadFromSecureFile("system_config.enc");
    
    IF (LEN(encrypted_config) > 0)
    {
        // Decrypt configuration
        decrypted_config = DecryptString(encrypted_config, CONFIG_ENCRYPTION_KEY);
        
        // Parse and apply configuration
        ParseSecureConfiguration(decrypted_config);
        
        // Clear decrypted data from memory
        ClearString(decrypted_config);
        
        LogSecurityEvent("Secure configuration loaded");
    }
    ELSE
    {
        LogSecurityEvent("Failed to load secure configuration");
    }
    
    // Clear encrypted data from memory
    ClearString(encrypted_config);
}

// Secure credential storage (never store passwords in plaintext)
FUNCTION StoreDeviceCredentials(STRING device_name[50], STRING username[50], STRING password[100])
{
    STRING password_hash[128];
    STRING salt[32];
    
    // Generate unique salt for this password
    salt = GenerateRandomSalt();
    
    // Hash password with salt
    password_hash = HashPasswordWithSalt(password, salt);
    
    // Store hashed credentials
    device_credentials[device_name].username = username;
    device_credentials[device_name].password_hash = password_hash;
    device_credentials[device_name].salt = salt;
    
    // Clear plaintext password from memory immediately
    ClearString(password);
    
    LogSecurityEvent("Device credentials stored for: " + device_name);
}

// Security event logging
FUNCTION LogSecurityEvent(STRING event_description[255], STRING additional_info[100])
{
    STRING security_log_entry[500];
    STRING timestamp[30];
    
    timestamp = GetFormattedTime();
    
    // Format security log entry
    security_log_entry = timestamp + " [SECURITY] " + event_description;
    
    IF (LEN(additional_info) > 0)
    {
        security_log_entry = security_log_entry + " | " + additional_info;
    }
    
    // Write to secure log file
    WriteToSecureLogFile(security_log_entry);
    
    // Send to security monitoring system if configured
    IF (security_monitoring_enabled = 1)
    {
        SendSecurityAlert(event_description, additional_info);
    }
    
    // Check for security patterns that require immediate attention
    AnalyzeSecurityPattern(event_description);
}

// Intrusion detection
FUNCTION MonitorSecurityThreats()
{
    // Monitor for failed login attempts
    IF (failed_login_count > MAX_FAILED_LOGINS)
    {
        LogSecurityEvent("Possible brute force attack detected");
        TriggerSecurityLockdown();
    }
    
    // Monitor for unusual network activity
    IF (network_activity_rate > NORMAL_ACTIVITY_THRESHOLD)
    {
        LogSecurityEvent("Unusual network activity detected");
        EnhanceSecurityMonitoring();
    }
    
    // Monitor for configuration changes
    IF (unauthorized_config_changes > 0)
    {
        LogSecurityEvent("Unauthorized configuration changes detected");
        RevertToSecureConfiguration();
    }
    
    // Schedule next monitoring cycle
    WAIT SECURITY_MONITOR_INTERVAL 'security_monitor'
    {
        MonitorSecurityThreats();
    }
}

// Security incident response
FUNCTION TriggerSecurityLockdown()
{
    LogSecurityEvent("SECURITY LOCKDOWN INITIATED");
    
    // Disable non-essential functions
    DisableGuestAccess();
    
    // Increase authentication requirements
    EnableEnhancedAuthentication();
    
    // Notify security administrators
    SendSecurityAlert("Security lockdown initiated", "System in protected mode");
    
    // Activate enhanced monitoring
    security_lockdown_active = 1;
    
    // Set automatic recovery timer (optional)
    WAIT LOCKDOWN_DURATION 'security_lockdown_timer'
    {
        // Automatic recovery after specified time
        IF (manual_lockdown_override = 0)
        {
            RecoverFromSecurityLockdown();
        }
    }
}

// MISTAKE: Creating timers without proper cleanup
FUNCTION BadTimerExample()
{
    // Problem: Timer names can conflict and cause unpredictable behavior
    WAIT 100 'timer1'
    {
        DoSomething();
    }
    
    // Later in code...
    WAIT 200 'timer1' // Same timer name - cancels previous timer!
    {
        DoSomethingElse();
    }
}

// CORRECT: Use unique, descriptive timer names
FUNCTION GoodTimerExample()
{
    // Use descriptive, unique timer names
    WAIT 100 'device_initialization_delay'
    {
        InitializeDevices();
    }
    
    // Use function-specific timer names
    WAIT 200 'user_interface_update_timer'
    {
        UpdateUserInterface();
    }
    
    // Always clean up timers when done
    CANCELWAIT 'device_initialization_delay';
    CANCELWAIT 'user_interface_update_timer';
}

// MISTAKE: Not canceling timers when objects are destroyed
FUNCTION BadTimerCleanup()
{
    // Starts a timer but doesn't provide cleanup
    WAIT 300 'recurring_task'
    {
        DoRecurringTask();
        
        // Problem: Restarts timer without cleanup consideration
        WAIT 300 'recurring_task'
        {
            DoRecurringTask();
        }
    }
}

// CORRECT: Implement proper timer cleanup
FUNCTION GoodTimerCleanup()
{
    // Cancel existing timer first
    CANCELWAIT 'recurring_task_timer';
    
    // Start new timer
    WAIT 300 'recurring_task_timer'
    {
        DoRecurringTask();
        
        // Recursive call with proper cleanup
        GoodTimerCleanup();
    }
}

// Implement cleanup function for shutdown
FUNCTION CleanupAllTimers()
{
    CANCELWAIT 'recurring_task_timer';
    CANCELWAIT 'device_poll_timer';
    CANCELWAIT 'ui_update_timer';
    CANCELWAIT 'health_monitor_timer';
}

// MISTAKE: Creating excessive string concatenations
FUNCTION BadStringHandling()
{
    STRING result[1000];
    INTEGER i;
    
    result = "";
    
    // Problem: Each concatenation creates new string objects
    FOR (i = 1; i <= 100; i++)
    {
        result = result + "Item " + ITOA(i) + ", ";
    }
    
    RETURN result;
}

// CORRECT: Use efficient string building techniques
FUNCTION GoodStringHandling()
{
    STRING result[1000];
    STRING temp_item[20];
    INTEGER i;
    
    ClearBuffer(result);
    
    // Build string efficiently
    FOR (i = 1; i <= 100; i++)
    {
        temp_item = "Item " + ITOA(i) + ", ";
        result = result + temp_item;
        
        // Clear temporary buffer
        ClearBuffer(temp_item);
    }
    
    RETURN result;
}

// MISTAKE: Not managing array sizes appropriately
STRING oversized_array[1000][500]; // Wastes memory if only need 10 items

// CORRECT: Size arrays based on actual requirements
STRING appropriately_sized_array[MAX_DEVICES][50];

// MISTAKE: Not checking return values or error conditions
FUNCTION BadErrorHandling()
{
    // Problem: No validation of input parameters
    SetDeviceVolume(volume_level);
    
    // Problem: No checking if device is online
    SendDeviceCommand("PWR1\x0D");
    
    // Problem: Assumes operation always succeeds
    ConnectToDevice(device_ip);
}

// CORRECT: Comprehensive error checking
FUNCTION GoodErrorHandling()
{
    INTEGER result;
    
    // Validate input parameters
    IF (volume_level < 0 OR volume_level > 100)
    {
        LogError("Invalid volume level: " + ITOA(volume_level));
        RETURN 0;
    }
    
    // Check device status before sending commands
    IF (IsDeviceOnline(device_ip) = 0)
    {
        LogWarning("Device offline, queuing command: " + device_ip);
        QueueCommand(device_ip, "PWR1\x0D");
        RETURN 0;
    }
    
    // Check return values
    result = ConnectToDevice(device_ip);
    IF (result = 0)
    {
        LogError("Failed to connect to device: " + device_ip);
        // Implement fallback or recovery procedure
        TriggerConnectionRecovery(device_ip);
        RETURN 0;
    }
    
    // Proceed with operation
    result = SetDeviceVolume(volume_level);
    IF (result = 0)
    {
        LogError("Failed to set volume level");
        RETURN 0;
    }
    
    RETURN 1; // Success
}

// MISTAKE: Not implementing recovery mechanisms
FUNCTION BadRecoveryHandling()
{
    // Problem: System fails permanently on first error
    IF (ConnectToProjector() = 0)
    {
        LogError("Projector connection failed");
        // No recovery attempt - system remains broken
    }
}

// CORRECT: Implement progressive recovery strategies
FUNCTION GoodRecoveryHandling()
{
    INTEGER retry_count;
    INTEGER connection_result;
    
    retry_count = 0;
    
    WHILE (retry_count < MAX_RETRY_ATTEMPTS)
    {
        connection_result = ConnectToProjector();
        
        IF (connection_result = 1)
        {
            LogInfo("Projector connection successful");
            RETURN 1; // Success
        }
        
        retry_count = retry_count + 1;
        LogWarning("Projector connection attempt " + ITOA(retry_count) + " failed");
        
        // Progressive backoff delay
        WAIT (retry_count * 50) 'projector_retry_delay'
        {
            // Delay increases with each retry
        }
    }
    
    // All retries failed - implement fallback
    LogError("Projector connection failed after " + ITOA(MAX_RETRY_ATTEMPTS) + " attempts");
    ActivateProjectorFallbackMode();
    
    RETURN 0; // Final failure
}

// MISTAKE: Not handling concurrent access properly
DIGITAL system_busy;

FUNCTION BadConcurrencyHandling()
{
    // Problem: Multiple functions can modify system_busy simultaneously
    IF (system_busy = 0)
    {
        system_busy = 1;
        
        // Problem: Another function might set system_busy between check and set
        PerformCriticalOperation();
        
        system_busy = 0;
    }
}

// CORRECT: Use proper synchronization
DIGITAL operation_lock;

FUNCTION GoodConcurrencyHandling()
{
    // Atomic check and set
    IF (operation_lock = 1)
    {
        LogWarning("Operation already in progress, skipping");
        RETURN 0;
    }
    
    // Set lock immediately
    operation_lock = 1;
    
    // Perform operation with timeout protection
    WAIT OPERATION_TIMEOUT 'operation_timeout'
    {
        LogError("Operation timeout, releasing lock");
        operation_lock = 0;
    }
    
    PerformCriticalOperation();
    
    // Always release lock when done
    CANCELWAIT 'operation_timeout';
    operation_lock = 0;
    
    RETURN 1;
}

// MISTAKE: Creating infinite recursion
FUNCTION BadRecursiveFunction(INTEGER depth)
{
    // Problem: No termination condition
    ProcessItem(depth);
    BadRecursiveFunction(depth + 1); // Will eventually crash
}

// CORRECT: Implement proper termination conditions
#DEFINE_CONSTANT MAX_RECURSION_DEPTH 50

FUNCTION GoodRecursiveFunction(INTEGER depth)
{
    // Check termination conditions
    IF (depth > MAX_RECURSION_DEPTH)
    {
        LogError("Maximum recursion depth exceeded");
        RETURN;
    }
    
    IF (IsProcessingComplete())
    {
        LogInfo("Processing completed at depth: " + ITOA(depth));
        RETURN;
    }
    
    // Process current item
    ProcessItem(depth);
    
    // Recursive call with depth tracking
    GoodRecursiveFunction(depth + 1);
}

// MISTAKE: Infinite loops without exit conditions
FUNCTION BadLoopExample()
{
    INTEGER counter;
    
    counter = 1;
    
    // Problem: No clear exit condition
    WHILE (1) // Infinite loop
    {
        ProcessItem(counter);
        counter = counter + 1;
        // No way to exit!
    }
}

// CORRECT: Always provide clear exit conditions
FUNCTION GoodLoopExample()
{
    INTEGER counter;
    INTEGER max_iterations;
    
    counter = 1;
    max_iterations = 1000; // Safety limit
    
    WHILE (counter <= max_iterations AND IsProcessingNeeded())
    {
        ProcessItem(counter);
        counter = counter + 1;
        
        // Additional safety check
        IF (HasErrorOccurred())
        {
            LogError("Exiting loop due to error at iteration: " + ITOA(counter));
            BREAK;
        }
    }
    
    // Log completion status
    IF (counter > max_iterations)
    {
        LogWarning("Loop terminated due to iteration limit");
    }
    ELSE
    {
        LogInfo("Loop completed successfully");
    }
}

// MISTAKE: No user feedback during long operations
FUNCTION BadUserFeedback()
{
    // Problem: User has no indication that system is working
    InitializeProjector(); // Takes 30 seconds
    ConfigureAudioSystem(); // Takes 15 seconds
    SetupLightingPresets(); // Takes 10 seconds
    
    // Only shows completion - user waits with no feedback
    DisplayMessage("System Ready");
}

// CORRECT: Provide continuous user feedback
FUNCTION GoodUserFeedback()
{
    DisplayMessage("System starting...");
    UpdateProgressBar(0);
    
    DisplayMessage("Initializing projector...");
    UpdateProgressBar(10);
    InitializeProjector();
    
    DisplayMessage("Configuring audio system...");
    UpdateProgressBar(40);
    ConfigureAudioSystem();
    
    DisplayMessage("Setting up lighting presets...");
    UpdateProgressBar(70);
    SetupLightingPresets();
    
    DisplayMessage("Finalizing configuration...");
    UpdateProgressBar(90);
    FinalizeSystemSetup();
    
    UpdateProgressBar(100);
    DisplayMessage("System Ready");
    
    // Hide progress indicator after completion
    WAIT 30 'hide_progress'
    {
        HideProgressIndicator();
    }
}

// MISTAKE: UI state doesn't match system state
FUNCTION BadStateManagement()
{
    // Problem: UI updated without verifying actual system state
    power_button_feedback = 1; // Show as "on"
    SendPowerCommand("PWR1\x0D");
    
    // Problem: What if command fails? UI shows wrong state
}

// CORRECT: Update UI based on actual system feedback
FUNCTION GoodStateManagement()
{
    // Show intermediate state
    power_button_feedback = BUTTON_WORKING; // Shows "working" state
    
    // Send command with timeout
    SendPowerCommand("PWR1\x0D");
    
    WAIT POWER_COMMAND_TIMEOUT 'power_timeout'
    {
        // Timeout - command failed
        power_button_feedback = BUTTON_ERROR;
        DisplayMessage("Power command failed");
        
        WAIT 30 'clear_error'
        {
            power_button_feedback = power_actual_state;
        }
    }
}

// Handle actual device feedback
WHEN (projector_power_feedback)
{
    // Cancel timeout since we got response
    CANCELWAIT 'power_timeout';
    
    // Update UI based on actual device state
    IF (projector_power_feedback = 1)
    {
        power_button_feedback = BUTTON_ON;
        power_actual_state = 1;
        DisplayMessage("Projector powered on");
    }
    ELSE
    {
        power_button_feedback = BUTTON_OFF;
        power_actual_state = 0;
        DisplayMessage("Projector powered off");
    }
}

[object Object],

,[object Object],
,[object Object], [ ] Code compiles without errors or warnings
,[object Object], [ ] All functions have appropriate documentation
,[object Object], [ ] Unit tests written and passing
,[object Object], [ ] Manual testing completed on target hardware
,[object Object], [ ] Code follows project style guidelines
,[object Object], [ ] No hardcoded values (use constants)
,[object Object], [ ] Error handling implemented for all failure scenarios
,[object Object], [ ] Resource management verified (timers, connections, memory)

,[object Object],
,[object Object], [ ] Source code changes
,[object Object], [ ] Updated documentation
,[object Object], [ ] Test results and procedures
,[object Object], [ ] Deployment notes
,[object Object], [ ] Impact assessment

// REVIEW CHECKPOINT: Function Documentation
/*
 * Function: HandleVolumeAdjustment
 * Purpose: Adjusts system volume with validation and feedback
 * 
 * Parameters:
 *   volume_change (INTEGER): Volume adjustment (-100 to +100)
 *   zone_id (INTEGER): Target audio zone (1 to MAX_ZONES)
 * 
 * Returns: DIGITAL - Success (1) or Failure (0)
 * 
 * Side Effects:
 *   - Updates volume_level global variable
 *   - Sends commands to audio DSP
 *   - Updates user interface displays
 *   - Logs volume changes
 * 
 * Error Conditions:
 *   - Invalid zone_id returns 0
 *   - Volume out of range returns 0
 *   - Device offline returns 0 but queues command
 */

// REVIEW CHECKPOINT: Input Validation
FUNCTION DIGITAL HandleVolumeAdjustment(INTEGER volume_change, INTEGER zone_id)
{
    INTEGER new_volume_level;
    
    // GOOD: Comprehensive input validation
    IF (zone_id < 1 OR zone_id > MAX_AUDIO_ZONES)
    {
        LogError("Invalid zone ID: " + ITOA(zone_id));
        RETURN 0;
    }
    
    IF (volume_change < -100 OR volume_change > 100)
    {
        LogError("Volume change out of range: " + ITOA(volume_change));
        RETURN 0;
    }
    
    // REVIEW CHECKPOINT: Boundary Checking
    new_volume_level = current_volume[zone_id] + volume_change;
    
    // GOOD: Clamp values to valid range instead of rejecting
    IF (new_volume_level < 0)
        new_volume_level = 0;
    ELSE IF (new_volume_level > 100)
        new_volume_level = 100;
    
    // REVIEW CHECKPOINT: Error Handling
    IF (IsAudioZoneOnline(zone_id) = 0)
    {
        LogWarning("Audio zone offline, queuing command: " + ITOA(zone_id));
        QueueVolumeCommand(zone_id, new_volume_level);
        RETURN 0; // Command queued but not executed
    }
    
    // REVIEW CHECKPOINT: Resource Management
    // Set timeout for volume command response
    WAIT VOLUME_COMMAND_TIMEOUT 'volume_timeout_zone_' + ITOA(zone_id)
    {
        LogError("Volume command timeout for zone: " + ITOA(zone_id));
        // Don't return failure immediately - may still succeed
    }
    
    // Execute volume change
    current_volume[zone_id] = new_volume_level;
    SendVolumeCommand(zone_id, new_volume_level);
    
    // REVIEW CHECKPOINT: User Feedback
    UpdateVolumeDisplay(zone_id, new_volume_level);
    LogInfo("Volume adjusted - Zone: " + ITOA(zone_id) + ", Level: " + ITOA(new_volume_level));
    
    RETURN 1; // Success
}

[object Object],
,[object Object], [ ] Code accomplishes stated requirements
,[object Object], [ ] All edge cases handled appropriately
,[object Object], [ ] Error conditions properly managed
,[object Object], [ ] Function return values are meaningful
,[object Object], [ ] Side effects are documented and appropriate
,[object Object], [ ] Performance impact is acceptable

[object Object],
,[object Object], [ ] Functions have single, clear responsibilities  
,[object Object], [ ] Variable names are descriptive and consistent
,[object Object], [ ] Magic numbers replaced with named constants
,[object Object], [ ] Code structure is logical and readable
,[object Object], [ ] Appropriate comments explain complex logic
,[object Object], [ ] No duplicate code (DRY principle followed)

[object Object],
,[object Object], [ ] Device communication includes timeout handling
,[object Object], [ ] User interface provides appropriate feedback
,[object Object], [ ] System state management is consistent
,[object Object], [ ] Resource usage is optimized for control processors
,[object Object], [ ] Network communication is robust and secure
,[object Object], [ ] Hardware-specific considerations addressed

// Example of code patterns to flag during automated review

// FLAG: Hardcoded values
device_ip_address = "192.168.1.100"; // Should use constant

// PREFER: Named constants
#DEFINE_CONSTANT MAIN_DISPLAY_IP "192.168.1.100"
device_ip_address = MAIN_DISPLAY_IP;

// FLAG: Missing error handling
result = ConnectToDevice();
ProcessDeviceData(); // What if connection failed?

// PREFER: Explicit error handling
result = ConnectToDevice();
IF (result = 1)
{
    ProcessDeviceData();
}
ELSE
{
    HandleConnectionError();
}

// FLAG: Resource leaks
WAIT 100 'temp_timer' { DoSomething(); }
// Timer never canceled

// PREFER: Proper cleanup
WAIT 100 'device_init_timer' { DoSomething(); }
// ... later in code
CANCELWAIT 'device_init_timer';

// FLAG: Overly complex functions
FUNCTION ComplexFunction() // 200+ lines
{
    // Function too large for maintainability
}

// PREFER: Modular approach
FUNCTION WellStructuredFunction()
{
    InitializeComponents();
    ProcessUserInput();
    UpdateSystemState();
    ProvideUserFeedback();
}

// Implement quality metrics collection
STRUCTURE code_quality_metrics
{
    INTEGER total_functions;
    INTEGER functions_with_docs;
    INTEGER functions_with_error_handling;
    INTEGER average_function_length;
    INTEGER total_timers;
    INTEGER total_timer_cleanups;
    INTEGER hardcoded_values_count;
    INTEGER magic_numbers_count;
};

code_quality_metrics project_metrics;

FUNCTION CalculateQualityScore()
{
    INTEGER quality_score;
    
    // Documentation completeness (25%)
    quality_score = (project_metrics.functions_with_docs * 25) / project_metrics.total_functions;
    
    // Error handling coverage (25%)
    quality_score = quality_score + 
                   ((project_metrics.functions_with_error_handling * 25) / project_metrics.total_functions);
    
    // Resource management (25%)
    IF (project_metrics.total_timers > 0)
    {
        quality_score = quality_score + 
                       ((project_metrics.total_timer_cleanups * 25) / project_metrics.total_timers);
    }
    
    // Code maintainability (25%)
    IF (project_metrics.hardcoded_values_count = 0 AND project_metrics.magic_numbers_count = 0)
    {
        quality_score = quality_score + 25;
    }
    ELSE
    {
        // Penalty for hardcoded values
        quality_score = quality_score + (25 - (project_metrics.hardcoded_values_count + project_metrics.magic_numbers_count));
    }
    
    // Ensure score is within bounds
    IF (quality_score > 100) quality_score = 100;
    IF (quality_score < 0) quality_score = 0;
    
    RETURN quality_score;
}

// Define testing requirements for each function type

// CRITICAL FUNCTIONS: 100% test coverage required
// - System power control
// - Safety systems
// - Security functions
// - Data persistence

// STANDARD FUNCTIONS: 80% test coverage required
// - User interface handlers
// - Device communication
// - Status monitoring

// UTILITY FUNCTIONS: 60% test coverage required
// - String manipulation
// - Mathematical calculations
// - Formatting functions

// Example comprehensive test for critical function
FUNCTION TestSystemPowerControl()
{
    LogInfo("Testing System Power Control - CRITICAL FUNCTION");
    
    // Test normal power on sequence
    RunTest("Power On - Normal Operation", 1, TestPowerOnNormal());
    
    // Test power on with device failures
    RunTest("Power On - Display Failure", 1, TestPowerOnDisplayFailure());
    RunTest("Power On - Audio Failure", 1, TestPowerOnAudioFailure());
    
    // Test power off sequence
    RunTest("Power Off - Normal Operation", 1, TestPowerOffNormal());
    RunTest("Power Off - Force Shutdown", 1, TestPowerOffForced());
    
    // Test edge cases
    RunTest("Multiple Power Requests", 1, TestMultiplePowerRequests());
    RunTest("Power During System Failure", 1, TestPowerDuringFailure());
    
    // Test recovery scenarios
    RunTest("Power Recovery After Outage", 1, TestPowerRecovery());
    
    LogInfo("System Power Control Testing Complete");
}

// Define performance benchmarks
#DEFINE_CONSTANT MAX_RESPONSE_TIME_MS 500      // UI must respond within 500ms
#DEFINE_CONSTANT MAX_DEVICE_COMMAND_TIME_MS 2000  // Device commands max 2 seconds
#DEFINE_CONSTANT MAX_STARTUP_TIME_MS 30000    // System startup max 30 seconds

FUNCTION TestPerformanceBenchmarks()
{
    INTEGER start_time, end_time, duration;
    
    // Test UI response time
    start_time = GetSystemTimeMS();
    SimulateButtonPress(VOLUME_UP_BUTTON);
    WaitForUIUpdate();
    end_time = GetSystemTimeMS();
    
    duration = end_time - start_time;
    RunTest("UI Response Time", 1, (duration < MAX_RESPONSE_TIME_MS));
    LogInfo("UI Response Time: " + ITOA(duration) + "ms");
    
    // Test device command response time
    start_time = GetSystemTimeMS();
    SendDeviceCommand("PWR1\x0D");
    WaitForDeviceResponse();
    end_time = GetSystemTimeMS();
    
    duration = end_time - start_time;
    RunTest("Device Command Time", 1, (duration < MAX_DEVICE_COMMAND_TIME_MS));
    LogInfo("Device Command Time: " + ITOA(duration) + "ms");
}

/*
 * =================================================================
 * AV SYSTEM API DOCUMENTATION
 * =================================================================
 * 
 * Module: Audio Control System
 * Version: 2.1.0
 * Last Updated: 2024-03-15
 * 
 * This module provides centralized audio control functionality
 * for multi-zone AV systems. All audio operations should use
 * these API functions rather than direct device communication.
 * 
 * Dependencies:
 * - Network communication module (network_comm.umc)
 * - Device configuration module (device_config.umc)
 * - Error logging module (error_log.umc)
 * 
 * =================================================================
 * PUBLIC FUNCTIONS
 * =================================================================
 */

/*
 * Function: SetZoneVolume
 * 
 * Description:
 *   Sets the volume level for a specified audio zone with
 *   validation and feedback handling.
 * 
 * Parameters:
 *   zone_id (INTEGER): Audio zone identifier (1-8)
 *   volume_level (INTEGER): Volume percentage (0-100)
 * 
 * Returns:
 *   DIGITAL: 1 = Success, 0 = Failure
 * 
 * Possible Failures:
 *   - Invalid zone_id (outside 1-8 range)
 *   - Invalid volume_level (outside 0-100 range)  
 *   - Zone device offline or unresponsive
 *   - Audio system in maintenance mode
 * 
 * Side Effects:
 *   - Updates zone_volume_levels array
 *   - Sends command to audio DSP
 *   - Updates user interface volume displays
 *   - Logs volume change event
 * 
 * Example Usage:
 *   result = SetZoneVolume(1, 75); // Set zone 1 to 75%
 *   IF (result = 0)
 *   {
 *       // Handle volume set failure
 *   }
 * 
 * Related Functions:
 *   - GetZoneVolume(): Retrieve current volume level
 *   - MuteZone(): Mute/unmute specified zone
 *   - IsZoneOnline(): Check zone availability
 */
FUNCTION DIGITAL SetZoneVolume(INTEGER zone_id, INTEGER volume_level)
{
    // Implementation...
}

// network_constants.cfg
#DEFINE_CONSTANT AUDIO_DSP_IP "192.168.1.30"
#DEFINE_CONSTANT VIDEO_SWITCHER_IP "192.168.1.40"

// timing_constants.cfg  
#DEFINE_CONSTANT DEVICE_TIMEOUT 30s
#DEFINE_CONSTANT UI_UPDATE_RATE 100ms

// system_limits.cfg
#DEFINE_CONSTANT MAX_AUDIO_ZONES 8
#DEFINE_CONSTANT MAX_VIDEO_INPUTS 16

// Each device module should implement these standard functions:
FUNCTION Initialize[DeviceType]()     // Setup device connection
FUNCTION Send[DeviceType]Command()    // Send commands with timeout
FUNCTION Process[DeviceType]Response() // Handle device feedback
FUNCTION Get[DeviceType]Status()      // Query device state
FUNCTION Cleanup[DeviceType]()        // Resource cleanup

// Load appropriate config based on environment
#IF_DEFINED DEVELOPMENT_BUILD
    #INCLUDE "config/development.cfg"
#ELSEIF_DEFINED STAGING_BUILD  
    #INCLUDE "config/staging.cfg"
#ELSE
    #INCLUDE "config/production.cfg"
#ENDIF

FUNCTION SendDeviceCommandWithRetry(STRING device_ip[16], STRING command[100])
{
    INTEGER retry_count;
    
    retry_count = 0;
    
    WHILE (retry_count < MAX_RETRY_ATTEMPTS)
    {
        // Send command
        SendCommand(device_ip, command);
        
        // Set timeout based on device type and network conditions
        WAIT GetDeviceTimeout(device_ip) 'device_response_' + device_ip
        {
            // Timeout occurred
            retry_count = retry_count + 1;
            LogWarning("Device timeout, retry " + ITOA(retry_count) + ": " + device_ip);
            
            // Progressive backoff
            WAIT (retry_count * 10) 'retry_delay'
            {
                // Continue to next retry
            }
        }
        
        // Exit loop if we get a response (timeout timer will be canceled)
        IF (device_responded[device_ip] = 1)
        {
            RETURN 1; // Success
        }
    }
    
    // All retries failed
    LogError("Device communication failed after retries: " + device_ip);
    HandleDeviceFailure(device_ip);
    RETURN 0;
}

// Create mock device responses for testing
#IF_DEFINED TESTING_MODE
    // Simulate device responses
    FUNCTION SimulateProjectorResponse(STRING command[100])
    {
        IF (command = "PWR1\x0D")
        {
            // Simulate 3-second warm-up delay
            WAIT 30 'projector_sim'
            {
                projector_feedback = "PWR1\x0D\x0A";
            }
        }
    }
#ENDIF

// Role-based access levels
#DEFINE_CONSTANT ACCESS_GUEST 1      // Basic controls only
#DEFINE_CONSTANT ACCESS_USER 2       // Full operational controls  
#DEFINE_CONSTANT ACCESS_ADMIN 3      // System configuration
#DEFINE_CONSTANT ACCESS_TECHNICIAN 4 // Diagnostic and maintenance

FUNCTION INTEGER AuthenticateUser(STRING username[50], STRING password[100])
{
    // Hash password (never store plaintext)
    hashed_password = HashPassword(password, salt);
    
    // Validate against secure credential store
    user_access_level = ValidateCredentials(username, hashed_password);
    
    IF (user_access_level > 0)
    {
        // Create session with timeout
        session_id = CreateSession(username, user_access_level);
        LogSecurityEvent("User login: " + username);
        RETURN session_id;
    }
    
    // Log failed attempt
    LogSecurityEvent("Failed login attempt: " + username);
    RETURN 0;
}