import {
  CommandConfig,
  CommandRegistrationState,
  CommandExecutionResult,
  CommandPutHandler,
  CommandHistoryEntry,
  PathConfig,
  WebAppPathConfig,
  PluginConfig,
  ThresholdConfig,
} from './types';
import {
  Context,
  Delta,
  Path,
  ServerAPI,
  SourceRef,
  Timestamp,
} from '@signalk/server-api';
import * as fs from 'fs-extra';
import * as path from 'path';
import {
  calculateDistance,
  isPointInBoundingBox,
  calculateBoundingBoxFromHomePort,
} from './utils/geo-calculator';
import { BoundingBox } from './types';

// Global variables for command management
let currentCommands: CommandConfig[] = [];
let commandHistory: CommandHistoryEntry[] = [];
let appInstance: ServerAPI;
let pluginConfig: PluginConfig | null = null;

// Threshold processing lock system for first-in rule
const thresholdProcessingLocks = new Map<string, boolean>();
const THRESHOLD_PROCESSING_TIMEOUT = 5000; // 5 seconds

// Command state management
const commandState: CommandRegistrationState = {
  registeredCommands: new Map<string, CommandConfig>(),
  putHandlers: new Map<string, CommandPutHandler>(),
};

// Threshold monitoring state
const thresholdState = new Map<
  string,
  {
    lastValue: any;
    lastTriggered: number;
    lastConditionMet?: boolean;
    unsubscribe?: () => void;
  }
>();

// Configuration management functions
export function loadWebAppConfig(app?: ServerAPI): WebAppPathConfig {
  const appToUse = app || appInstance;
  if (!appToUse) {
    throw new Error('App instance not provided and not initialized');
  }

  const webAppConfigPath = path.join(
    appToUse.getDataDirPath(),
    'signalk-parquet',
    'webapp-config.json'
  );

  try {
    if (fs.existsSync(webAppConfigPath)) {
      const configData = fs.readFileSync(webAppConfigPath, 'utf8');
      const rawConfig = JSON.parse(configData);

      // Migrate old config format to new format with backward compatibility
      const migratedPaths = (rawConfig.paths || []).map(
        (path: Partial<PathConfig>) => ({
          path: path.path,
          name: path.name,
          enabled: path.enabled,
          regimen: path.regimen,
          source: path.source || undefined,
          context: path.context,
          excludeMMSI: path.excludeMMSI,
          autoDiscovered: path.autoDiscovered,
        })
      );

      const migratedCommands = rawConfig.commands || [];

      const migratedConfig = {
        paths: migratedPaths,
        commands: migratedCommands,
      };

      appToUse.debug(
        `Loaded and migrated ${migratedPaths.length} paths and ${migratedCommands.length} commands from existing config`
      );

      // Save the migrated config back to preserve the new format
      try {
        fs.writeFileSync(
          webAppConfigPath,
          JSON.stringify(migratedConfig, null, 2)
        );
        appToUse.debug(
          'Saved migrated configuration with source field compatibility'
        );
      } catch (saveError) {
        appToUse.debug(`Warning: Could not save migrated config: ${saveError}`);
      }

      return migratedConfig;
    }
  } catch (error) {
    appToUse.error(`Failed to load webapp configuration: ${error}`);

    // BACKUP the broken file instead of destroying it
    try {
      const backupPath = webAppConfigPath + '.backup.' + Date.now();
      if (fs.existsSync(webAppConfigPath)) {
        fs.copyFileSync(webAppConfigPath, backupPath);
        appToUse.debug(`Backed up broken config to: ${backupPath}`);
      }
    } catch (backupError) {
      appToUse.debug(`Could not backup broken config: ${backupError}`);
    }
  }

  // Only create defaults if NO config file exists
  if (!fs.existsSync(webAppConfigPath)) {
    const defaultConfig = getDefaultWebAppConfig();
    appToUse.debug(
      'No existing configuration found, using default installation'
    );

    // Save the default configuration for future use
    try {
      const configDir = path.dirname(webAppConfigPath);
      if (!fs.existsSync(configDir)) {
        fs.mkdirSync(configDir, { recursive: true });
      }
      fs.writeFileSync(
        webAppConfigPath,
        JSON.stringify(defaultConfig, null, 2)
      );
      appToUse.debug('Saved default installation configuration');
    } catch (error) {
      appToUse.debug(`Failed to save default configuration: ${error}`);
    }

    return defaultConfig;
  }

  // If file exists but couldn't be parsed, return empty config to avoid data loss
  appInstance.debug(
    'Config file exists but could not be parsed, returning empty config to avoid data loss'
  );
  return {
    paths: [],
    commands: [],
  };
}

function getDefaultWebAppConfig(): WebAppPathConfig {
  const defaultCommands: CommandConfig[] = [
    {
      command: 'captureMoored',
      path: 'commands.captureMoored',
      registered: 'COMPLETED',
      description: 'Capture data when moored (position and wind)',
      active: false,
    },
  ];

  const defaultPaths: PathConfig[] = [
    {
      path: 'commands.captureMoored' as Path,
      name: 'Command: captureMoored',
      enabled: true,
      regimen: 'commands',
      source: undefined,
      context: 'vessels.self' as Context,
    },
    {
      path: 'navigation.position' as Path,
      name: 'Navigation Position',
      enabled: true,
      regimen: 'captureMoored',
      source: undefined,
      context: 'vessels.self' as Context,
    },
    {
      path: 'environment.wind.speedApparent' as Path,
      name: 'Apparent Wind Speed',
      enabled: true,
      regimen: 'captureMoored',
      source: undefined,
      context: 'vessels.self' as Context,
    },
  ];

  return {
    commands: defaultCommands,
    paths: defaultPaths,
  };
}

export function saveWebAppConfig(
  paths: PathConfig[],
  commands: CommandConfig[],
  app?: ServerAPI
): void {
  const appToUse = app || appInstance;
  if (!appToUse) {
    throw new Error('App instance not provided and not initialized');
  }

  const webAppConfigPath = path.join(
    appToUse.getDataDirPath(),
    'signalk-parquet',
    'webapp-config.json'
  );
  try {
    const configDir = path.dirname(webAppConfigPath);
    if (!fs.existsSync(configDir)) {
      fs.mkdirSync(configDir, { recursive: true });
    }

    const webAppConfig: WebAppPathConfig = { paths, commands };
    fs.writeFileSync(webAppConfigPath, JSON.stringify(webAppConfig, null, 2));
    appToUse.debug(
      `Saved webapp configuration: ${paths.length} paths, ${commands.length} commands`
    );
  } catch (error) {
    appToUse.error(`Failed to save webapp configuration: ${error}`);
  }
}

// Initialize command state on plugin start
export function initializeCommandState(
  currentPaths: PathConfig[],
  app: ServerAPI
): void {
  appInstance = app;

  // Clear existing command state
  commandState.registeredCommands.clear();
  commandState.putHandlers.clear();

  // Re-register commands from configuration
  currentCommands.forEach((commandConfig: CommandConfig) => {
    const result = registerCommand(
      commandConfig.command,
      commandConfig.description,
      commandConfig.keywords,
      commandConfig.defaultState,
      commandConfig.thresholds,
      true // skipThresholdSetup - let startThresholdMonitoring handle it
    );
    if (result.state === 'COMPLETED') {
      /* no-op: restored successfully, only the failure case needs logging */
    } else {
      app.error(
        `❌ Failed to restore command: ${commandConfig.command} - ${result.message}`
      );
    }
  });

  // Ensure all commands have path configurations (for backwards compatibility)
  let addedMissingPaths = false;
  currentCommands.forEach((commandConfig: CommandConfig) => {
    const commandPath = `commands.${commandConfig.command}`;
    const autoPath = `commands.${commandConfig.command}.auto`;

    // Add main command path if missing
    const existingCommandPath = currentPaths.find(p => p.path === commandPath);
    if (!existingCommandPath) {
      const commandPathConfig: PathConfig = {
        path: commandPath as Path,
        name: `Command: ${commandConfig.command}`,
        enabled: true,
        regimen: undefined,
        source: undefined,
        context: 'vessels.self' as Context,
        excludeMMSI: undefined,
      };
      currentPaths.push(commandPathConfig);
      addedMissingPaths = true;
    }

    // Add .auto path if command has thresholds and path is missing
    if (commandConfig.thresholds && commandConfig.thresholds.length > 0) {
      const existingAutoPath = currentPaths.find(p => p.path === autoPath);
      if (!existingAutoPath) {
        const autoPathConfig: PathConfig = {
          path: autoPath as Path,
          name: `Command Auto: ${commandConfig.command}`,
          enabled: true,
          regimen: 'commands',
          source: undefined,
          context: 'vessels.self' as Context,
          excludeMMSI: undefined,
        };
        currentPaths.push(autoPathConfig);
        addedMissingPaths = true;
      }
    }
  });

  // Save the updated configuration if we added missing paths
  if (addedMissingPaths) {
    saveWebAppConfig(currentPaths, currentCommands, app);
  }

  // Reset all commands to false on startup
  currentCommands.forEach((commandConfig: CommandConfig) => {
    initializeCommandValue(commandConfig.command, false);
  });
}

// Command registration with full type safety
export function registerCommand(
  commandName: string,
  description?: string,
  keywords?: string[],
  defaultState?: boolean,
  thresholds?: ThresholdConfig[],
  skipThresholdSetup: boolean = false
): CommandExecutionResult {
  try {
    // Validate command name
    if (!isValidCommandName(commandName)) {
      return {
        success: false,
        state: 'FAILED',
        statusCode: 400,
        message:
          'Invalid command name. Use alphanumeric characters and underscores only.',
        timestamp: new Date().toISOString(),
      };
    }

    // Check if command already exists
    if (commandState.registeredCommands.has(commandName)) {
      return {
        success: false,
        state: 'FAILED',
        statusCode: 409,
        message: `Command '${commandName}' already registered`,
        timestamp: new Date().toISOString(),
      };
    }

    const commandPath = `commands.${commandName}`;
    const fullPath = `vessels.self.${commandPath}`;

    // Create command configuration
    const commandConfig: CommandConfig = {
      command: commandName,
      path: fullPath,
      registered: new Date().toISOString(),
      description: description || `Command: ${commandName}`,
      keywords: keywords || [],
      active: false,
      lastExecuted: undefined,
      defaultState: defaultState,
      thresholds: thresholds,
    };

    // Create PUT handler with proper typing
    const putHandler: CommandPutHandler = (
      context: string,
      path: string,
      // eslint-disable-next-line @typescript-eslint/no-explicit-any
      value: any,
      callback?: (result: CommandExecutionResult) => void
    ): CommandExecutionResult => {
      appInstance.debug(
        `Handling PUT for commands.${commandName} with value: ${JSON.stringify(value)}`
      );
      // Extract value from object if needed (PUT body may be {value: true/false, source: "..."})
      const rawValue =
        value !== null && typeof value === 'object' && 'value' in value
          ? value.value
          : value;
      const result = executeCommand(commandName, Boolean(rawValue));
      // Call callback to signal completion (returns 200 instead of 202)
      if (callback) callback(result);
      return result;
    };

    // Register PUT handler with SignalK
    appInstance.registerPutHandler(
      'vessels.self',
      commandPath,
      putHandler as any, //FIXME server api registerPutHandler is incorrectly typed https://github.com/SignalK/signalk-server/pull/2043
      'zennora-parquet-commands'
    );

    // Store command and handler
    commandState.registeredCommands.set(commandName, commandConfig);
    commandState.putHandlers.set(commandName, putHandler);

    // Initialize command value to defaultState or false
    initializeCommandValue(commandName, defaultState || false);

    // Initialize .auto path for threshold automation control
    const autoPath = `commands.${commandName}.auto`;
    const autoEnabled = !!(
      commandConfig.thresholds && commandConfig.thresholds.length > 0
    );
    initializeCommandValue(`${commandName}.auto`, autoEnabled);

    // Register PUT handler for .auto control
    const autoPutHandler = (
      _context: string,
      _path: string,
      value: any,
      _callback?: (result: CommandExecutionResult) => void
    ): CommandExecutionResult => {
      appInstance.debug(
        `Handling PUT for ${autoPath} with value: ${JSON.stringify(value)}`
      );

      // Update the .auto value - extract from object if needed
      const rawValue =
        value !== null && typeof value === 'object' && 'value' in value
          ? value.value
          : value;
      const autoValue = Boolean(rawValue);
      const timestamp = new Date().toISOString();

      // One-time transition operations when .auto toggles
      if (autoValue) {
        // Enabling automation: 1) Set to OFF, 2) Evaluate thresholds immediately, 3) Thresholds take control (continuous)
        appInstance.debug(`🤖 Enabling automation for ${commandName}`);

        // 1. Set command state to OFF/false
        const offResult = executeCommand(commandName, false);
        if (offResult.success) {
          appInstance.debug(
            `🔧 Command ${commandName} set to OFF before threshold evaluation`
          );
        } else {
          appInstance.error(
            `❌ Failed to set ${commandName} to OFF: ${offResult.message}`
          );
        }

        // 2. Immediately evaluate all thresholds
        if (commandConfig.thresholds && commandConfig.thresholds.length > 0) {
          commandConfig.thresholds.forEach(threshold => {
            const currentValue = appInstance.getSelfPath(
              threshold.watchPath as Path
            );
            if (currentValue !== undefined) {
              const monitorKey = buildThresholdMonitorKey(
                commandName,
                threshold
              );
              const state = thresholdState.get(monitorKey);
              if (state) {
                processThresholdValue(
                  commandConfig,
                  threshold,
                  currentValue,
                  monitorKey
                );
                appInstance.debug(
                  `🎯 Evaluated threshold for ${commandName}:${threshold.watchPath}`
                );
              }
            }
          });
        }
      } else {
        // Disabling automation: 1) Stop monitoring (handled by threshold checks), 2) Leave state as-is, 3) Enable manual control
        appInstance.debug(
          `👤 Disabling automation for ${commandName}, state unchanged`
        );
      }

      appInstance.handleMessage('signalk-parquet-commands', {
        context: 'vessels.self' as Context,
        updates: [
          {
            $source: 'signalk-parquet-commands' as SourceRef,
            timestamp: timestamp as Timestamp,
            values: [
              {
                path: autoPath as Path,
                value: autoValue,
              },
            ],
          },
        ],
      });

      const result: CommandExecutionResult = {
        success: true,
        state: 'COMPLETED',
        statusCode: 200,
        message: `Automation ${autoValue ? 'enabled' : 'disabled'} for ${commandName}`,
        timestamp,
      };

      // Call callback to signal completion (returns 200 instead of 202)
      if (_callback) _callback(result);
      return result;
    };

    // Register .auto PUT handler with SignalK
    appInstance.registerPutHandler(
      'vessels.self',
      autoPath,
      autoPutHandler as any,
      'signalk-parquet-commands'
    );

    // Start threshold monitoring for this command if thresholds are defined
    // Skip during initialization - startThresholdMonitoring() will set them up
    if (
      !skipThresholdSetup &&
      commandConfig.thresholds &&
      commandConfig.thresholds.length > 0
    ) {
      commandConfig.thresholds.forEach(threshold => {
        if (threshold.enabled) {
          setupThresholdMonitoring(commandConfig, threshold);
        }
      });
    }

    // Update current commands
    currentCommands = Array.from(commandState.registeredCommands.values());

    // Log command registration
    addCommandHistoryEntry(commandName, 'REGISTER', undefined, true);

    appInstance.debug(`✅ Registered command: ${commandName} at ${fullPath}`);

    return {
      success: true,
      state: 'COMPLETED',
      statusCode: 200,
      message: `Command '${commandName}' registered successfully with automatic path configuration`,
      timestamp: new Date().toISOString(),
    };
  } catch (error) {
    const errorMessage = `Failed to register command '${commandName}': ${error}`;
    appInstance.error(errorMessage);

    return {
      success: false,
      state: 'FAILED',
      statusCode: 500,
      message: errorMessage,
      timestamp: new Date().toISOString(),
    };
  }
}

// Command update (description and keywords only)
export function updateCommand(
  commandName: string,
  description?: string,
  keywords?: string[],
  defaultState?: boolean,
  thresholds?: any[]
): CommandExecutionResult {
  try {
    // Check if command exists
    if (!commandState.registeredCommands.has(commandName)) {
      return {
        success: false,
        state: 'FAILED',
        statusCode: 404,
        message: `Command '${commandName}' not found`,
        timestamp: new Date().toISOString(),
      };
    }

    // Get existing command config
    const existingCommand = commandState.registeredCommands.get(commandName)!;

    // Update only the fields that were provided
    const updatedCommand: CommandConfig = {
      ...existingCommand,
      description:
        description !== undefined ? description : existingCommand.description,
      keywords: keywords !== undefined ? keywords : existingCommand.keywords,
      defaultState:
        defaultState !== undefined
          ? defaultState
          : existingCommand.defaultState,
      thresholds:
        thresholds !== undefined ? thresholds : existingCommand.thresholds,
    };

    // Update the command in the registry
    commandState.registeredCommands.set(commandName, updatedCommand);

    // Update current commands array
    currentCommands = Array.from(commandState.registeredCommands.values());

    // If thresholds were updated, restart threshold monitoring for this command
    if (thresholds !== undefined) {
      // Stop existing threshold monitoring for this command
      const existingThresholds = existingCommand.thresholds || [];
      existingThresholds.forEach(threshold => {
        const monitorKey = `${commandName}_${threshold.watchPath}`;
        const state = thresholdState.get(monitorKey);
        if (state?.unsubscribe) {
          state.unsubscribe();
          thresholdState.delete(monitorKey);
        }
      });

      // Start new threshold monitoring
      if (updatedCommand.thresholds && updatedCommand.thresholds.length > 0) {
        updatedCommand.thresholds.forEach(threshold => {
          if (threshold.enabled) {
            setupThresholdMonitoring(updatedCommand, threshold);
          }
        });
      }
    }

    // Log the update
    addCommandHistoryEntry(commandName, 'UPDATE', undefined, true);

    appInstance.debug(`✅ Updated command: ${commandName}`);

    return {
      success: true,
      state: 'COMPLETED',
      statusCode: 200,
      message: `Command '${commandName}' updated successfully`,
      timestamp: new Date().toISOString(),
    };
  } catch (error) {
    appInstance.error(
      `Failed to update command ${commandName}: ${(error as Error).message}`
    );
    return {
      success: false,
      state: 'FAILED',
      statusCode: 500,
      message: `Failed to update command: ${(error as Error).message}`,
      timestamp: new Date().toISOString(),
    };
  }
}

// Command unregistration with type safety
export function unregisterCommand(commandName: string): CommandExecutionResult {
  try {
    const commandConfig = commandState.registeredCommands.get(commandName);
    if (!commandConfig) {
      return {
        success: false,
        state: 'FAILED',
        statusCode: 404,
        message: `Command '${commandName}' not found`,
        timestamp: new Date().toISOString(),
      };
    }

    // Remove PUT handler (SignalK API doesn't have unregister, but we can track it)
    commandState.putHandlers.delete(commandName);
    commandState.registeredCommands.delete(commandName);

    // Update current commands
    currentCommands = Array.from(commandState.registeredCommands.values());

    // Log command unregistration
    addCommandHistoryEntry(commandName, 'UNREGISTER', undefined, true);

    appInstance.debug(`🗑️ Unregistered command: ${commandName}`);

    return {
      success: true,
      state: 'COMPLETED',
      statusCode: 200,
      message: `Command '${commandName}' unregistered successfully with path cleanup`,
      timestamp: new Date().toISOString(),
    };
  } catch (error) {
    const errorMessage = `Failed to unregister command '${commandName}': ${error}`;
    appInstance.error(errorMessage);

    return {
      success: false,
      state: 'FAILED',
      statusCode: 500,
      message: errorMessage,
      timestamp: new Date().toISOString(),
    };
  }
}

// Command execution with full type safety
export function executeCommand(
  commandName: string,
  value: boolean
): CommandExecutionResult {
  try {
    const commandConfig = commandState.registeredCommands.get(commandName);
    if (!commandConfig) {
      return {
        success: false,
        state: 'FAILED',
        statusCode: 404,
        message: `Command '${commandName}' not found`,
        timestamp: new Date().toISOString(),
      };
    }

    // Execute the command by sending delta
    const timestamp = new Date().toISOString();
    const delta: Delta = {
      context: 'vessels.self' as Context,
      updates: [
        {
          $source: 'signalk-parquet-commands' as SourceRef,
          timestamp: timestamp as Timestamp,
          values: [
            {
              path: `commands.${commandName}` as Path,
              value: value,
            },
          ],
        },
      ],
    };

    // Send delta message
    //FIXME see if delta can be Delta from the beginning
    appInstance.handleMessage('signalk-parquet-commands', delta as Delta);

    // Update command state
    commandConfig.active = value;
    commandConfig.lastExecuted = timestamp;
    commandState.registeredCommands.set(commandName, commandConfig);

    // Update current commands
    currentCommands = Array.from(commandState.registeredCommands.values());

    // Log command execution
    addCommandHistoryEntry(commandName, 'EXECUTE', value, true);

    appInstance.debug(`🎮 Executed command: ${commandName} = ${value}`);

    return {
      success: true,
      state: 'COMPLETED',
      statusCode: 200,
      message: `Command '${commandName}' executed: ${value}`,
      timestamp: timestamp,
    };
  } catch (error) {
    const errorMessage = `Failed to execute command '${commandName}': ${error}`;
    appInstance.error(errorMessage);

    addCommandHistoryEntry(commandName, 'EXECUTE', value, false, errorMessage);

    return {
      success: false,
      state: 'FAILED',
      statusCode: 500,
      message: errorMessage,
      timestamp: new Date().toISOString(),
    };
  }
}

// Helper functions with type safety
function isValidCommandName(commandName: string): boolean {
  const validPattern = /^[a-zA-Z0-9_]+$/;
  return (
    validPattern.test(commandName) &&
    commandName.length > 0 &&
    commandName.length <= 50
  );
}

function initializeCommandValue(commandName: string, value: boolean): void {
  const timestamp = new Date().toISOString() as Timestamp;
  const delta: Delta = {
    context: 'vessels.self' as Context,
    updates: [
      {
        $source: 'signalk-parquet-commands' as SourceRef,
        timestamp,
        values: [
          {
            path: `commands.${commandName}` as Path,
            value,
          },
        ],
      },
    ],
  };

  //FIXME
  appInstance.handleMessage('signalk-parquet-commands', delta as Delta);
}

function addCommandHistoryEntry(
  command: string,
  action: 'EXECUTE' | 'STOP' | 'REGISTER' | 'UNREGISTER' | 'UPDATE',
  value?: boolean,
  success: boolean = true,
  error?: string
): void {
  const entry: CommandHistoryEntry = {
    command,
    action,
    value,
    timestamp: new Date().toISOString(),
    success,
    error,
  };

  commandHistory.push(entry);

  // Keep only last 100 entries
  if (commandHistory.length > 100) {
    commandHistory = commandHistory.slice(-100);
  }
}

// Helper function to extract command name from SignalK path
export function extractCommandName(signalkPath: string): string {
  // Extract command name from "commands.captureWeather"
  const parts = signalkPath.split('.');
  return parts[parts.length - 1];
}

// Getters for external access
export function getCurrentCommands(): CommandConfig[] {
  return currentCommands;
}

export function getCommandHistory(): CommandHistoryEntry[] {
  return commandHistory;
}

export function getCommandState(): CommandRegistrationState {
  return commandState;
}

export function setCurrentCommands(commands: CommandConfig[]): void {
  currentCommands = commands;
}

export function updatePluginConfig(config: PluginConfig): void {
  pluginConfig = config;
  appInstance?.debug(
    `📍 Plugin config updated (homePort: ${config.homePortLatitude}, ${config.homePortLongitude})`
  );

  // Re-evaluate all position-based thresholds with new home port
  // This uses level-triggered logic (not edge-triggered like processThresholdValue)
  // because config changes require immediate state reconciliation
  currentCommands.forEach(command => {
    if (command.thresholds) {
      command.thresholds.forEach(threshold => {
        if (threshold.enabled && isPositionOperator(threshold.operator)) {
          // Check if automation is enabled for this command
          const autoEnabledRaw = appInstance?.getSelfPath(
            `commands.${command.command}.auto` as Path
          );
          const autoEnabled =
            autoEnabledRaw &&
            typeof autoEnabledRaw === 'object' &&
            'value' in autoEnabledRaw
              ? autoEnabledRaw.value
              : autoEnabledRaw;

          if (!autoEnabled) {
            appInstance?.debug(
              `🚫 Skipping threshold re-evaluation for ${command.command} (automation disabled)`
            );
            return;
          }

          const currentValue = appInstance?.getSelfPath(
            threshold.watchPath as Path
          );
          if (currentValue !== undefined) {
            const normalizedValue = normalizeThresholdValue(
              currentValue,
              threshold
            );

            const homePort =
              pluginConfig &&
              pluginConfig.homePortLatitude &&
              pluginConfig.homePortLongitude
                ? {
                    latitude: pluginConfig.homePortLatitude,
                    longitude: pluginConfig.homePortLongitude,
                  }
                : undefined;

            const conditionMet = evaluateThreshold(
              threshold,
              normalizedValue,
              homePort
            );

            // Level-triggered: set to activateOnMatch when condition met, opposite when not met
            const desiredState = conditionMet
              ? Boolean(threshold.activateOnMatch)
              : !threshold.activateOnMatch;

            // Get current command state
            const currentCommandValue = appInstance?.getSelfPath(
              `commands.${command.command}` as Path
            );
            const actualValue =
              currentCommandValue &&
              typeof currentCommandValue === 'object' &&
              'value' in currentCommandValue
                ? currentCommandValue.value
                : currentCommandValue;
            const currentlyActive = Boolean(actualValue);

            appInstance?.debug(
              `🔄 Config change re-eval: ${command.command} conditionMet=${conditionMet}, current=${currentlyActive}, desired=${desiredState}`
            );

            if (currentlyActive !== desiredState) {
              appInstance?.debug(
                `📍 Config change triggers state change: ${command.command} → ${desiredState ? 'ON' : 'OFF'}`
              );
              executeCommand(command.command, desiredState);

              // Update command state
              command.active = desiredState;
              commandState.registeredCommands.set(command.command, command);
            }
          }
        }
      });
    }
  });
}

function isPositionOperator(operator: string): boolean {
  return [
    'withinRadius',
    'outsideRadius',
    'inBoundingBox',
    'outsideBoundingBox',
  ].includes(operator);
}

// Threshold monitoring system
export function startThresholdMonitoring(
  app: ServerAPI,
  config?: PluginConfig
): void {
  appInstance = app;
  if (config) {
    pluginConfig = config;
  }
  app.debug('🔄 Starting threshold monitoring system');

  // Process all commands
  currentCommands.forEach(command => {
    if (command.thresholds && command.thresholds.length > 0) {
      // Set up monitoring for all enabled thresholds
      command.thresholds.forEach(threshold => {
        if (threshold.enabled) {
          setupThresholdMonitoring(command, threshold);
        }
      });
    } else {
      // Apply default state for commands without thresholds or manual override
      applyDefaultState(command);
    }
  });
}

function applyDefaultState(command: CommandConfig): void {
  // Skip if manual override is active
  if (command.manualOverride) {
    return;
  }

  // Apply default state if specified and command is not already active
  if (
    command.defaultState !== undefined &&
    command.active !== command.defaultState
  ) {
    appInstance?.debug(
      `🔧 Applying default state for ${command.command}: ${command.defaultState ? 'ON' : 'OFF'}`
    );

    const result = executeCommand(command.command, command.defaultState);
    if (result.success) {
      appInstance?.debug(
        `✅ Default state applied: ${command.command} = ${command.defaultState}`
      );
    } else {
      appInstance?.error(
        `❌ Failed to apply default state: ${command.command} - ${result.message}`
      );
    }
  }
}

export function stopThresholdMonitoring(): void {
  appInstance?.debug('⏹️ Stopping threshold monitoring system');

  // Unsubscribe from all threshold monitors
  thresholdState.forEach(state => {
    if (state.unsubscribe) {
      state.unsubscribe();
    }
  });
  thresholdState.clear();
}

function setupThresholdMonitoring(
  command: CommandConfig,
  threshold: ThresholdConfig
): void {
  if (threshold?.enabled === false || !threshold.watchPath) {
    return;
  }
  const monitorKey = buildThresholdMonitorKey(command.command, threshold);

  appInstance?.debug(
    `🎯 Setting up threshold monitoring for ${command.command} watching ${threshold.watchPath}`
  );

  // Clean up existing monitoring for this command
  const existingState = thresholdState.get(monitorKey);
  if (existingState?.unsubscribe) {
    existingState.unsubscribe();
  }

  // Subscribe to the watch path
  const unsubscribe = appInstance?.streambundle
    ?.getSelfStream(threshold.watchPath as Path)
    ?.onValue((value: any) => {
      try {
        processThresholdValue(command, threshold, value, monitorKey);
      } catch (error) {
        appInstance?.error(
          `❌ Error processing threshold for ${command.command}: ${(error as Error).message}`
        );
      }
    });

  // Store the monitoring state
  thresholdState.set(monitorKey, {
    lastValue: undefined,
    lastTriggered: 0,
    lastConditionMet: undefined,
    unsubscribe,
  });

  // Evaluate immediately with current value if available
  try {
    const currentValue = appInstance?.getSelfPath(threshold.watchPath as Path);
    if (currentValue !== undefined) {
      processThresholdValue(command, threshold, currentValue, monitorKey);
    }
  } catch (error) {
    appInstance?.debug(
      `ℹ️ Unable to read current value for ${threshold.watchPath}: ${(error as Error).message}`
    );
  }
}

function processThresholdValue(
  command: CommandConfig,
  threshold: ThresholdConfig,
  value: any,
  monitorKey: string
): void {
  const state = thresholdState.get(monitorKey);
  if (!state) return;

  const commandName = command.command;

  // Check if threshold processing is already running for this command (first-in rule)
  if (thresholdProcessingLocks.get(commandName)) {
    appInstance?.debug(
      `🔒 Threshold processing already running for ${commandName}, skipping`
    );
    return;
  }

  // Acquire lock
  thresholdProcessingLocks.set(commandName, true);

  // Set timeout to prevent deadlocks
  const timeoutId = setTimeout(() => {
    if (thresholdProcessingLocks.get(commandName)) {
      appInstance?.error(
        `⚠️ Threshold processing timeout for ${commandName}, releasing lock`
      );
      thresholdProcessingLocks.set(commandName, false);
    }
  }, THRESHOLD_PROCESSING_TIMEOUT);

  try {
    const normalizedValue = normalizeThresholdValue(value, threshold);
    // Verbose: logs on every value update
    // appInstance?.debug(
    //   `📈 Threshold monitor ${commandName}:${threshold.watchPath} received value: ${JSON.stringify(normalizedValue)}`
    // );

    // Check if automation is enabled for this command
    const autoEnabledRaw = appInstance?.getSelfPath(
      `commands.${commandName}.auto` as Path
    );
    const autoEnabled =
      autoEnabledRaw &&
      typeof autoEnabledRaw === 'object' &&
      'value' in autoEnabledRaw
        ? autoEnabledRaw.value
        : autoEnabledRaw;

    if (!autoEnabled) {
      appInstance?.debug(
        `🚫 Threshold automation disabled for ${commandName} (auto=${autoEnabled})`
      );
      return;
    }

    // Skip processing if manual override is active (backward compatibility)
    if (command.manualOverride) {
      // Check if manual override has expired
      if (command.manualOverrideUntil) {
        const expiry = new Date(command.manualOverrideUntil);
        if (new Date() > expiry) {
          // Override expired, clear it
          command.manualOverride = false;
          command.manualOverrideUntil = undefined;
          appInstance?.debug(`⏰ Manual override expired for ${commandName}`);
        } else {
          // Override still active, skip threshold processing
          return;
        }
      } else {
        // Permanent manual override, skip threshold processing
        return;
      }
    }

    const now = Date.now();

    // Get homePort from config for position-based thresholds
    const homePort =
      pluginConfig &&
      pluginConfig.homePortLatitude &&
      pluginConfig.homePortLongitude
        ? {
            latitude: pluginConfig.homePortLatitude,
            longitude: pluginConfig.homePortLongitude,
          }
        : undefined;

    const conditionMet = evaluateThreshold(
      threshold,
      normalizedValue,
      homePort
    );

    // Better debug logging for different threshold types
    let _thresholdDesc = '';
    if (
      threshold.operator === 'inBoundingBox' ||
      threshold.operator === 'outsideBoundingBox'
    ) {
      if (threshold.useHomePort && threshold.boxSize && threshold.boxAnchor) {
        _thresholdDesc = `homePort-based box: size=${threshold.boxSize}m anchor=${threshold.boxAnchor} homePort=${JSON.stringify(homePort)}`;
      } else if (threshold.boundingBox) {
        _thresholdDesc = `manual box: ${JSON.stringify(threshold.boundingBox)}`;
      } else {
        _thresholdDesc = 'NO BOX CONFIGURED';
      }
    } else if (
      threshold.operator === 'withinRadius' ||
      threshold.operator === 'outsideRadius'
    ) {
      _thresholdDesc = `radius=${threshold.radius}m useHomePort=${threshold.useHomePort} lat=${threshold.latitude} lon=${threshold.longitude}`;
    } else {
      _thresholdDesc = `value=${threshold.value}`;
    }

    // Verbose: logs on every value update
    // appInstance?.debug(
    //   `📉 Threshold evaluation for ${commandName}:${threshold.watchPath} operator=${threshold.operator} ${_thresholdDesc} conditionMet=${conditionMet}`
    // );

    if (!conditionMet) {
      // For position-based operators, we need bidirectional triggering:
      // When condition becomes FALSE, set command to opposite of activateOnMatch
      if (isPositionOperator(threshold.operator)) {
        const desiredState = !threshold.activateOnMatch;

        // Get current command state
        const currentCommandValue = appInstance?.getSelfPath(
          `commands.${commandName}` as Path
        );
        const actualValue =
          currentCommandValue &&
          typeof currentCommandValue === 'object' &&
          'value' in currentCommandValue
            ? currentCommandValue.value
            : currentCommandValue;
        const currentlyActive = Boolean(actualValue);

        if (currentlyActive !== desiredState) {
          appInstance?.debug(
            `📍 Position threshold condition FALSE: ${commandName} → ${desiredState ? 'ON' : 'OFF'}`
          );
          const result = executeCommand(commandName, desiredState);
          if (result.success) {
            command.active = desiredState;
            commandState.registeredCommands.set(commandName, command);
            currentCommands = Array.from(
              commandState.registeredCommands.values()
            );
          }
        }
      }

      state.lastConditionMet = false;
      state.lastValue = normalizedValue;
      return;
    }

    // Apply hysteresis window only when condition remains true
    if (threshold.hysteresis && state.lastTriggered) {
      const timeSinceLastTrigger = now - state.lastTriggered;
      if (timeSinceLastTrigger < threshold.hysteresis * 1000) {
        appInstance?.debug(
          `⏱️ Hysteresis active for ${commandName}, skipping trigger (${timeSinceLastTrigger}ms < ${threshold.hysteresis * 1000}ms)`
        );
        state.lastConditionMet = true;
        state.lastValue = normalizedValue;
        return;
      }
    }

    const desiredState = Boolean(threshold.activateOnMatch);

    // Determine current command state
    const currentCommandValue = appInstance?.getSelfPath(
      `commands.${commandName}` as Path
    );
    const actualValue =
      currentCommandValue &&
      typeof currentCommandValue === 'object' &&
      'value' in currentCommandValue
        ? currentCommandValue.value
        : currentCommandValue;
    const currentlyActive = Boolean(actualValue);

    // Verbose: logs on every value update
    // appInstance?.debug(
    //   `🔍 Command state check for ${commandName}: current=${actualValue} (bool=${currentlyActive}), desired=${desiredState}`
    // );

    if (currentlyActive !== desiredState) {
      appInstance?.debug(
        `🎯 Threshold condition met for ${commandName}: ${threshold.watchPath} = ${normalizedValue}, setting to ${desiredState ? 'ON' : 'OFF'}`
      );

      const result = executeCommand(commandName, desiredState);
      if (result.success) {
        state.lastTriggered = now;
        command.active = desiredState;
        commandState.registeredCommands.set(commandName, command);
        currentCommands = Array.from(commandState.registeredCommands.values());
        appInstance?.debug(
          `✅ Command updated by threshold: ${commandName} = ${desiredState}`
        );
      } else {
        appInstance?.error(
          `❌ Threshold-triggered command failed: ${commandName} - ${result.message}`
        );
      }
    } else {
      // Verbose: logs on every value update when state unchanged
      // appInstance?.debug(
      //   `ℹ️ Command ${commandName} already ${desiredState ? 'ON' : 'OFF'}, no action taken`
      // );
    }

    state.lastConditionMet = true;
    state.lastValue = normalizedValue;
  } catch (error) {
    appInstance?.error(
      `❌ Error processing threshold for ${commandName}: ${(error as Error).message}`
    );
  } finally {
    // Always release lock and clear timeout
    clearTimeout(timeoutId);
    thresholdProcessingLocks.set(commandName, false);
  }
}

function evaluateThreshold(
  threshold: ThresholdConfig,
  currentValue: any,
  homePort?: { latitude: number; longitude: number }
): boolean {
  switch (threshold.operator) {
    // Numeric operators
    case 'gt':
      return (
        typeof currentValue === 'number' &&
        typeof threshold.value === 'number' &&
        currentValue > threshold.value
      );

    case 'lt':
      return (
        typeof currentValue === 'number' &&
        typeof threshold.value === 'number' &&
        currentValue < threshold.value
      );

    case 'eq':
      return currentValue === threshold.value;

    case 'ne':
      return currentValue !== threshold.value;

    case 'range':
      if (
        typeof currentValue !== 'number' ||
        typeof threshold.valueMin !== 'number' ||
        typeof threshold.valueMax !== 'number'
      ) {
        return false;
      }
      return (
        currentValue >= threshold.valueMin && currentValue <= threshold.valueMax
      );

    // String operators
    case 'contains':
      return (
        typeof currentValue === 'string' &&
        typeof threshold.value === 'string' &&
        currentValue.includes(threshold.value)
      );

    case 'startsWith':
      return (
        typeof currentValue === 'string' &&
        typeof threshold.value === 'string' &&
        currentValue.startsWith(threshold.value)
      );

    case 'endsWith':
      return (
        typeof currentValue === 'string' &&
        typeof threshold.value === 'string' &&
        currentValue.endsWith(threshold.value)
      );

    case 'stringEquals':
      return (
        typeof currentValue === 'string' &&
        typeof threshold.value === 'string' &&
        currentValue === threshold.value
      );

    // Boolean operators
    case 'true':
      return (
        currentValue === true || currentValue === 'true' || currentValue === 1
      );

    case 'false':
      return (
        currentValue === false || currentValue === 'false' || currentValue === 0
      );

    // Position operators
    case 'withinRadius':
    case 'outsideRadius': {
      if (
        !currentValue ||
        typeof currentValue.latitude !== 'number' ||
        typeof currentValue.longitude !== 'number'
      ) {
        appInstance?.error(
          `❌ Threshold ${threshold.watchPath}: Current value is not a valid position`
        );
        return false;
      }

      const targetLat =
        threshold.useHomePort && homePort
          ? homePort.latitude
          : threshold.latitude;
      const targetLon =
        threshold.useHomePort && homePort
          ? homePort.longitude
          : threshold.longitude;

      if (typeof targetLat !== 'number' || typeof targetLon !== 'number') {
        appInstance?.error(
          `❌ Threshold ${threshold.watchPath}: Target position not configured`
        );
        return false;
      }

      if (typeof threshold.radius !== 'number') {
        appInstance?.error(
          `❌ Threshold ${threshold.watchPath}: Radius not configured`
        );
        return false;
      }

      const distance = calculateDistance(
        currentValue.latitude,
        currentValue.longitude,
        targetLat,
        targetLon
      );

      return threshold.operator === 'withinRadius'
        ? distance <= threshold.radius
        : distance > threshold.radius;
    }

    case 'inBoundingBox':
    case 'outsideBoundingBox': {
      if (
        !currentValue ||
        typeof currentValue.latitude !== 'number' ||
        typeof currentValue.longitude !== 'number'
      ) {
        appInstance?.error(
          `❌ Threshold ${threshold.watchPath}: Current value is not a valid position`
        );
        return false;
      }

      let boundingBox: BoundingBox;

      // Check if using home port-based bounding box
      if (threshold.useHomePort && threshold.boxSize && threshold.boxAnchor) {
        if (!homePort) {
          appInstance?.error(
            `❌ Threshold ${threshold.watchPath}: Home port not configured`
          );
          return false;
        }

        // Calculate bounding box from home port, box size, and anchor
        // Add buffer for GPS accuracy (default 5m)
        const buffer =
          threshold.boxBuffer !== undefined ? threshold.boxBuffer : 5;
        const effectiveBoxSize = threshold.boxSize + buffer;

        boundingBox = calculateBoundingBoxFromHomePort(
          homePort.latitude,
          homePort.longitude,
          effectiveBoxSize,
          threshold.boxAnchor
        );
      } else if (threshold.boundingBox) {
        // Use manual bounding box
        boundingBox = threshold.boundingBox;
      } else {
        appInstance?.error(
          `❌ Threshold ${threshold.watchPath}: Bounding box not configured`
        );
        return false;
      }

      const inBox = isPointInBoundingBox(
        currentValue.latitude,
        currentValue.longitude,
        boundingBox
      );

      return threshold.operator === 'inBoundingBox' ? inBox : !inBox;
    }

    default:
      appInstance?.error(
        `❌ Unknown threshold operator: ${threshold.operator}`
      );
      return false;
  }
}

function normalizeThresholdValue(value: any, threshold: ThresholdConfig): any {
  if (value === null || value === undefined) {
    return value;
  }

  if (typeof value === 'object') {
    if ('value' in value) {
      return value.value;
    }
    if ('values' in value && value.values && typeof value.values === 'object') {
      if ('value' in value.values) {
        return value.values.value;
      }
    }
  }

  if (typeof value === 'string') {
    const trimmed = value.trim();
    if (trimmed === '') {
      return value;
    }
    const lower = trimmed.toLowerCase();
    if (lower === 'true' || lower === 'false') {
      return lower === 'true';
    }
    const num = Number(trimmed);
    if (!Number.isNaN(num)) {
      return num;
    }
  }

  if (typeof value === 'number') {
    return value;
  }

  if (typeof value === 'boolean') {
    return value;
  }

  // If threshold expects numeric and value is object with number
  if (typeof threshold.value === 'number') {
    const extracted = Number(value);
    if (!Number.isNaN(extracted)) {
      return extracted;
    }
  }

  return value;
}

function buildThresholdMonitorKey(
  commandName: string,
  threshold: ThresholdConfig
): string {
  const parts: string[] = [
    commandName,
    threshold.watchPath,
    threshold.operator,
  ];

  if (threshold.value !== undefined) {
    parts.push(`value=${JSON.stringify(threshold.value)}`);
  }

  if (threshold.valueMin !== undefined) {
    parts.push(`min=${threshold.valueMin}`);
  }

  if (threshold.valueMax !== undefined) {
    parts.push(`max=${threshold.valueMax}`);
  }

  if (threshold.latitude !== undefined) {
    parts.push(`lat=${threshold.latitude}`);
  }

  if (threshold.longitude !== undefined) {
    parts.push(`lon=${threshold.longitude}`);
  }

  if (threshold.radius !== undefined) {
    parts.push(`radius=${threshold.radius}`);
  }

  if (threshold.useHomePort) {
    parts.push('useHomePort=true');
  }

  if (threshold.boxSize !== undefined) {
    parts.push(`boxSize=${threshold.boxSize}`);
  }

  if (threshold.boxAnchor) {
    parts.push(`boxAnchor=${threshold.boxAnchor}`);
  }

  if (threshold.boundingBox) {
    const { north, south, east, west } = threshold.boundingBox;
    parts.push(`boundingBox=${north},${south},${east},${west}`);
  }

  parts.push(`activateOnMatch=${threshold.activateOnMatch}`);

  if (threshold.hysteresis !== undefined) {
    parts.push(`hysteresis=${threshold.hysteresis}`);
  }

  return parts.join('|');
}

export function updateCommandThreshold(
  commandName: string,
  threshold: ThresholdConfig
): CommandExecutionResult {
  const command = commandState.registeredCommands.get(commandName);
  if (!command) {
    return {
      success: false,
      state: 'FAILED',
      message: `Command ${commandName} not found`,
      timestamp: new Date().toISOString(),
    };
  }

  // Update the thresholds configuration (replace single threshold with array)
  command.thresholds = [threshold];

  // Restart monitoring for this command
  if (threshold.enabled) {
    setupThresholdMonitoring(command, threshold);
  } else {
    // Stop monitoring if disabled
    const monitorKey = buildThresholdMonitorKey(commandName, threshold);
    const state = thresholdState.get(monitorKey);
    if (state?.unsubscribe) {
      state.unsubscribe();
      thresholdState.delete(monitorKey);
    }
  }

  // Save configuration
  const config = loadWebAppConfig();
  saveWebAppConfig(config.paths, config.commands, appInstance);

  appInstance?.debug(`🎯 Updated threshold configuration for ${commandName}`);
  return {
    success: true,
    state: 'COMPLETED',
    message: `Threshold updated for ${commandName}`,
    timestamp: new Date().toISOString(),
  };
}

export function setManualOverride(
  commandName: string,
  override: boolean,
  expiryMinutes?: number
): CommandExecutionResult {
  const command = commandState.registeredCommands.get(commandName);
  if (!command) {
    return {
      success: false,
      state: 'FAILED',
      message: `Command ${commandName} not found`,
      timestamp: new Date().toISOString(),
    };
  }

  command.manualOverride = override;

  if (override && expiryMinutes) {
    const expiry = new Date(Date.now() + expiryMinutes * 60 * 1000);
    command.manualOverrideUntil = expiry.toISOString();
    appInstance?.debug(
      `🔒 Manual override set for ${commandName} until ${expiry.toISOString()}`
    );
  } else if (override) {
    command.manualOverrideUntil = undefined;
    appInstance?.debug(`🔒 Permanent manual override set for ${commandName}`);
  } else {
    // Enabling automation mode: set to OFF then evaluate thresholds
    command.manualOverrideUntil = undefined;
    appInstance?.debug(
      `🔓 Manual override cleared for ${commandName}, enabling automation`
    );

    // Set command to OFF (defaultState = false)
    const offResult = executeCommand(commandName, false);
    if (offResult.success) {
      appInstance?.debug(
        `🔧 Command ${commandName} set to OFF (default state) before threshold evaluation`
      );
    } else {
      appInstance?.error(
        `❌ Failed to set ${commandName} to OFF: ${offResult.message}`
      );
    }

    // Immediately evaluate all thresholds for this command
    if (command.thresholds && command.thresholds.length > 0) {
      command.thresholds.forEach(threshold => {
        const currentValue = appInstance?.getSelfPath(
          threshold.watchPath as Path
        );
        if (currentValue !== undefined) {
          const monitorKey = buildThresholdMonitorKey(commandName, threshold);
          const state = thresholdState.get(monitorKey);

          if (state) {
            // Threshold monitoring is active, evaluate immediately
            processThresholdValue(command, threshold, currentValue, monitorKey);
            appInstance?.debug(
              `🎯 Immediately evaluated threshold for ${commandName}:${threshold.watchPath}`
            );
          } else {
            appInstance?.debug(
              `⚠️ Threshold state not found for ${commandName}:${threshold.watchPath}, will evaluate on next update`
            );
          }
        }
      });
    }
  }

  // Save configuration
  const config = loadWebAppConfig();
  saveWebAppConfig(config.paths, config.commands, appInstance);

  return {
    success: true,
    state: 'COMPLETED',
    message: `Manual override ${override ? 'enabled' : 'disabled'} for ${commandName}`,
    timestamp: new Date().toISOString(),
  };
}