import process from 'node:process';
import * as fs from 'node:fs';
import * as path from 'node:path';
import { NupstSnmp } from './snmp/manager.ts';
import type { ISnmpConfig, IUpsStatus as ISnmpUpsStatus } from './snmp/types.ts';
import { NupstUpsd } from './upsd/client.ts';
import type { IUpsdConfig } from './upsd/types.ts';
import type { TProtocol } from './protocol/types.ts';
import { ProtocolResolver } from './protocol/resolver.ts';
import { logger } from './logger.ts';
import { MigrationRunner } from './migrations/index.ts';
import { formatPowerStatus, getBatteryColor, getRuntimeColor, theme } from './colors.ts';
import type { IActionConfig } from './actions/base-action.ts';
import { ActionManager } from './actions/index.ts';
import {
  applyDefaultShutdownDelay,
  buildUpsActionContext,
  decideUpsActionExecution,
  type TUpsTriggerReason,
} from './action-orchestration.ts';
import { NupstHttpServer } from './http-server.ts';
import { NETWORK, PAUSE, SHUTDOWN, THRESHOLDS, TIMING, UI } from './constants.ts';
import {
  analyzeConfigReload,
  shouldRefreshPauseState,
  shouldReloadConfig,
} from './config-watch.ts';
import { type IPauseState, loadPauseSnapshot } from './pause-state.ts';
import { ShutdownExecutor } from './shutdown-executor.ts';
import {
  buildGroupStatusSnapshot,
  buildGroupThresholdContextStatus,
  evaluateGroupActionThreshold,
} from './group-monitoring.ts';
import {
  buildFailedUpsPollSnapshot,
  buildSuccessfulUpsPollSnapshot,
  ensureUpsStatus,
  getActionThresholdStates,
  getEnteredThresholdIndexes,
} from './ups-monitoring.ts';
import {
  buildShutdownErrorRow,
  buildShutdownStatusRow,
  selectEmergencyCandidate,
} from './shutdown-monitoring.ts';
import { createInitialUpsStatus, type IUpsStatus } from './ups-status.ts';

/**
 * UPS configuration interface
 */
export interface IUpsConfig {
  /** Unique ID for the UPS */
  id: string;
  /** Friendly name for the UPS */
  name: string;
  /** Communication protocol (defaults to 'snmp') */
  protocol?: TProtocol;
  /** SNMP configuration settings (required for 'snmp' protocol) */
  snmp?: ISnmpConfig;
  /** UPSD/NIS configuration settings (required for 'upsd' protocol) */
  upsd?: IUpsdConfig;
  /** Group IDs this UPS belongs to */
  groups: string[];
  /** Actions to trigger on power status changes and threshold violations */
  actions?: IActionConfig[];
}

/**
 * Group configuration interface
 */
export interface IGroupConfig {
  /** Unique ID for the group */
  id: string;
  /** Friendly name for the group */
  name: string;
  /** Group operation mode */
  mode: 'redundant' | 'nonRedundant';
  /** Optional description */
  description?: string;
  /** Actions to trigger on power status changes and threshold violations */
  actions?: IActionConfig[];
}

/**
 * HTTP Server configuration interface
 */
export interface IHttpServerConfig {
  /** Whether HTTP server is enabled */
  enabled: boolean;
  /** Port to listen on */
  port: number;
  /** URL path for the endpoint */
  path: string;
  /** Authentication token */
  authToken: string;
}

/**
 * Configuration interface for the daemon
 */
export interface INupstConfig {
  /** Configuration format version */
  version?: string;
  /** UPS devices configuration */
  upsDevices: IUpsConfig[];
  /** Groups configuration */
  groups: IGroupConfig[];
  /** Check interval in milliseconds */
  checkInterval: number;
  /** Default delay in minutes for shutdown actions without an override */
  defaultShutdownDelay?: number;
  /** HTTP Server configuration */
  httpServer?: IHttpServerConfig;

  // Legacy fields for backward compatibility (will be migrated away)
  /** UPS list (v3 format - legacy) */
  upsList?: IUpsConfig[];
  /** SNMP configuration settings (v1 format - legacy) */
  snmp?: ISnmpConfig;
  /** Threshold settings (v1 format - legacy) */
  thresholds?: {
    /** Shutdown when battery below this percentage */
    battery: number;
    /** Shutdown when runtime below this minutes */
    runtime: number;
  };
}

/**
 * Daemon class for monitoring UPS and handling shutdown
 * Responsible for loading/saving config and monitoring the UPS status
 */
export class NupstDaemon {
  /** Default configuration path */
  private readonly CONFIG_PATH = '/etc/nupst/config.json';

  /** Default configuration */
  private readonly DEFAULT_CONFIG: INupstConfig = {
    version: '4.4',
    defaultShutdownDelay: SHUTDOWN.DEFAULT_DELAY_MINUTES,
    upsDevices: [
      {
        id: 'default',
        name: 'Default UPS',
        snmp: {
          host: '127.0.0.1',
          port: 161,
          community: 'public',
          version: 1,
          timeout: 5000,
          // SNMPv3 defaults (used only if version === 3)
          securityLevel: 'authPriv',
          username: '',
          authProtocol: 'SHA',
          authKey: '',
          privProtocol: 'AES',
          privKey: '',
          // UPS model for OID selection
          upsModel: 'cyberpower',
          runtimeUnit: 'ticks',
        },
        groups: [],
        actions: [
          {
            type: 'shutdown',
            triggerMode: 'onlyThresholds',
            thresholds: {
              battery: THRESHOLDS.DEFAULT_BATTERY_PERCENT, // Shutdown when battery below 60%
              runtime: THRESHOLDS.DEFAULT_RUNTIME_MINUTES, // Shutdown when runtime below 20 minutes
            },
          },
        ],
      },
    ],
    groups: [],
    checkInterval: TIMING.CHECK_INTERVAL_MS, // Check every 30 seconds
  };

  private config: INupstConfig;
  private snmp: NupstSnmp;
  private upsd: NupstUpsd;
  private protocolResolver: ProtocolResolver;
  private isRunning: boolean = false;
  private isPaused: boolean = false;
  private pauseState: IPauseState | null = null;
  private upsStatus: Map<string, IUpsStatus> = new Map();
  private groupStatus: Map<string, IUpsStatus> = new Map();
  private thresholdState: Map<string, boolean[]> = new Map();
  private httpServer?: NupstHttpServer;
  private readonly shutdownExecutor: ShutdownExecutor;

  /**
   * Create a new daemon instance with the given protocol managers
   */
  constructor(snmp: NupstSnmp, upsd: NupstUpsd) {
    this.snmp = snmp;
    this.upsd = upsd;
    this.protocolResolver = new ProtocolResolver(snmp, upsd);
    this.shutdownExecutor = new ShutdownExecutor();
    this.config = this.DEFAULT_CONFIG;
  }

  /**
   * Load configuration from file
   * @throws Error if configuration file doesn't exist
   */
  public async loadConfig(): Promise<INupstConfig> {
    try {
      // Check if config file exists
      const configExists = fs.existsSync(this.CONFIG_PATH);
      if (!configExists) {
        const errorMsg = `No configuration found at ${this.CONFIG_PATH}`;
        this.logConfigError(errorMsg);
        throw new Error(errorMsg);
      }

      // Read and parse config
      const configData = fs.readFileSync(this.CONFIG_PATH, 'utf8');
      const parsedConfig = JSON.parse(configData);

      // Run migrations to upgrade config format if needed
      const migrationRunner = new MigrationRunner();
      const { config: migratedConfig, migrated } = await migrationRunner.run(parsedConfig);

      // Save migrated or normalized config back to disk when needed.
      // Cast to INupstConfig since migrations ensure the output is valid.
      const validConfig = migratedConfig as unknown as INupstConfig;
      const normalizedShutdownDelay = this.normalizeShutdownDelay(validConfig.defaultShutdownDelay);
      const shouldPersistNormalizedConfig =
        validConfig.defaultShutdownDelay !== normalizedShutdownDelay;
      validConfig.defaultShutdownDelay = normalizedShutdownDelay;
      if (migrated || shouldPersistNormalizedConfig) {
        this.config = validConfig;
        await this.saveConfig(this.config);
      } else {
        this.config = validConfig;
      }

      return this.config;
    } catch (error) {
      if (
        error instanceof Error && error.message && error.message.includes('No configuration found')
      ) {
        throw error; // Re-throw the no configuration error
      }

      this.logConfigError(
        `Error loading configuration: ${error instanceof Error ? error.message : String(error)}`,
      );
      throw new Error('Failed to load configuration');
    }
  }

  /**
   * Save configuration to file
   */
  public saveConfig(config: INupstConfig): void {
    try {
      const configDir = path.dirname(this.CONFIG_PATH);
      if (!fs.existsSync(configDir)) {
        fs.mkdirSync(configDir, { recursive: true });
      }

      // Ensure version is always set and remove legacy fields before saving
      const configToSave: INupstConfig = {
        version: '4.4',
        upsDevices: config.upsDevices,
        groups: config.groups,
        checkInterval: config.checkInterval,
        defaultShutdownDelay: this.normalizeShutdownDelay(config.defaultShutdownDelay),
        ...(config.httpServer ? { httpServer: config.httpServer } : {}),
      };

      fs.writeFileSync(this.CONFIG_PATH, JSON.stringify(configToSave, null, 2));
      this.config = configToSave;

      logger.logBox('Configuration Saved', [`Location: ${this.CONFIG_PATH}`], 45, 'success');
    } catch (error) {
      logger.error(`Error saving configuration: ${error}`);
    }
  }

  /**
   * Helper method to log configuration errors consistently
   */
  private logConfigError(message: string): void {
    logger.logBox(
      'Configuration Error',
      [message, "Please run 'nupst ups add' first to create a configuration."],
      45,
      'error',
    );
  }

  /**
   * Get the current configuration
   */
  public getConfig(): INupstConfig {
    return this.config;
  }

  private normalizeShutdownDelay(delayMinutes: number | undefined): number {
    if (
      typeof delayMinutes !== 'number' ||
      !Number.isFinite(delayMinutes) ||
      delayMinutes < 0
    ) {
      return SHUTDOWN.DEFAULT_DELAY_MINUTES;
    }

    return delayMinutes;
  }

  private getDefaultShutdownDelayMinutes(): number {
    return this.normalizeShutdownDelay(this.config.defaultShutdownDelay);
  }

  /**
   * Get the SNMP instance
   */
  public getNupstSnmp(): NupstSnmp {
    return this.snmp;
  }

  /**
   * Get the UPSD instance
   */
  public getNupstUpsd(): NupstUpsd {
    return this.upsd;
  }

  /**
   * Start the monitoring daemon
   */
  public async start(): Promise<void> {
    if (this.isRunning) {
      logger.log('Daemon is already running');
      return;
    }

    logger.log('Starting NUPST daemon...');

    try {
      // Load configuration - this will throw an error if config doesn't exist
      await this.loadConfig();
      this.logConfigLoaded();

      // Log version information
      const nupst = this.snmp.getNupst();
      if (nupst) {
        nupst.logVersionInfo(false); // Don't check for updates immediately on startup

        // Check for updates in the background
        nupst.checkForUpdates().then((updateAvailable: boolean) => {
          if (updateAvailable) {
            const updateStatus = nupst.getUpdateStatus();
            const boxWidth = 45;
            logger.logBoxTitle('Update Available', boxWidth);
            logger.logBoxLine(`Current Version: ${updateStatus.currentVersion}`);
            logger.logBoxLine(`Latest Version: ${updateStatus.latestVersion}`);
            logger.logBoxLine('Run "sudo nupst upgrade" to upgrade');
            logger.logBoxEnd();
          }
        }).catch(() => {}); // Ignore errors checking for updates
      }

      // Initialize UPS status tracking
      this.initializeUpsStatus();

      // Start HTTP server if configured
      if (this.config.httpServer?.enabled && this.config.httpServer.authToken) {
        try {
          this.httpServer = new NupstHttpServer(
            this.config.httpServer.port,
            this.config.httpServer.path,
            this.config.httpServer.authToken,
            () => this.upsStatus,
            () => this.pauseState,
          );
          this.httpServer.start();
        } catch (error) {
          logger.error(
            `Failed to start HTTP server: ${
              error instanceof Error ? error.message : String(error)
            }`,
          );
        }
      }

      // Start UPS monitoring
      this.isRunning = true;
      await this.monitor();
    } catch (error) {
      this.isRunning = false;
      logger.error(
        `Daemon failed to start: ${error instanceof Error ? error.message : String(error)}`,
      );
      process.exit(1); // Exit with error
    }
  }

  /**
   * Initialize UPS status tracking for all UPS devices
   */
  private initializeUpsStatus(): void {
    this.upsStatus.clear();

    if (this.config.upsDevices && this.config.upsDevices.length > 0) {
      for (const ups of this.config.upsDevices) {
        this.upsStatus.set(ups.id, createInitialUpsStatus(ups));
      }

      logger.log(`Initialized status tracking for ${this.config.upsDevices.length} UPS devices`);
    } else {
      logger.error('No UPS devices found in configuration');
    }
  }

  /**
   * Log the loaded configuration settings
   */
  private logConfigLoaded(): void {
    logger.log('');
    logger.logBoxTitle('Configuration Loaded', 70, 'success');
    logger.logBoxLine(`Check Interval: ${this.config.checkInterval / 1000} seconds`);
    logger.logBoxEnd();
    logger.log('');

    // Display UPS devices in a table
    if (this.config.upsDevices && this.config.upsDevices.length > 0) {
      logger.info(`UPS Devices (${this.config.upsDevices.length}):`);

      const upsColumns: Array<
        { header: string; key: string; align?: 'left' | 'right'; color?: (val: string) => string }
      > = [
        { header: 'Name', key: 'name', align: 'left', color: theme.highlight },
        { header: 'ID', key: 'id', align: 'left', color: theme.dim },
        { header: 'Protocol', key: 'protocol', align: 'left' },
        { header: 'Host:Port', key: 'host', align: 'left', color: theme.info },
        { header: 'Actions', key: 'actions', align: 'left' },
      ];

      const upsRows: Array<Record<string, string>> = this.config.upsDevices.map((ups) => {
        const protocol = ups.protocol || 'snmp';
        let host = 'N/A';
        if (protocol === 'upsd' && ups.upsd) {
          host = `${ups.upsd.host}:${ups.upsd.port}`;
        } else if (ups.snmp) {
          host = `${ups.snmp.host}:${ups.snmp.port}`;
        }
        return {
          name: ups.name,
          id: ups.id,
          protocol: protocol.toUpperCase(),
          host,
          actions: `${(ups.actions || []).length} configured`,
        };
      });

      logger.logTable(upsColumns, upsRows);
      logger.log('');
    } else {
      logger.warn('No UPS devices configured');
      logger.log('');
    }

    // Display groups in a table
    if (this.config.groups && this.config.groups.length > 0) {
      logger.info(`Groups (${this.config.groups.length}):`);

      const groupColumns: Array<
        { header: string; key: string; align?: 'left' | 'right'; color?: (val: string) => string }
      > = [
        { header: 'Name', key: 'name', align: 'left', color: theme.highlight },
        { header: 'ID', key: 'id', align: 'left', color: theme.dim },
        { header: 'Mode', key: 'mode', align: 'left', color: theme.info },
      ];

      const groupRows: Array<Record<string, string>> = this.config.groups.map((group) => ({
        name: group.name,
        id: group.id,
        mode: group.mode,
      }));

      logger.logTable(groupColumns, groupRows);
      logger.log('');
    }
  }

  /**
   * Stop the monitoring daemon
   */
  public stop(): void {
    logger.log('Stopping NUPST daemon...');

    // Stop HTTP server if running
    if (this.httpServer) {
      this.httpServer.stop();
    }

    this.isRunning = false;
  }

  /**
   * Get the current pause state
   */
  public getPauseState(): IPauseState | null {
    return this.pauseState;
  }

  /**
   * Check and update pause state from the pause file
   */
  private checkPauseState(): void {
    const snapshot = loadPauseSnapshot(PAUSE.FILE_PATH, this.isPaused);

    if (snapshot.transition === 'autoResumed') {
      logger.log('');
      logger.logBoxTitle('Auto-Resume', 45, 'success');
      logger.logBoxLine('Pause duration expired, resuming action monitoring');
      logger.logBoxEnd();
      logger.log('');
    } else if (snapshot.transition === 'paused' && snapshot.pauseState) {
      logger.log('');
      logger.logBoxTitle('Actions Paused', 45, 'warning');
      logger.logBoxLine(`Paused by: ${snapshot.pauseState.pausedBy}`);
      if (snapshot.pauseState.reason) {
        logger.logBoxLine(`Reason: ${snapshot.pauseState.reason}`);
      }
      if (snapshot.pauseState.resumeAt) {
        const remaining = Math.round((snapshot.pauseState.resumeAt - Date.now()) / 1000);
        logger.logBoxLine(`Auto-resume in: ${remaining} seconds`);
      } else {
        logger.logBoxLine('Duration: Indefinite (run "nupst resume" to resume)');
      }
      logger.logBoxEnd();
      logger.log('');
    } else if (snapshot.transition === 'resumed') {
      logger.log('');
      logger.logBoxTitle('Actions Resumed', 45, 'success');
      logger.logBoxLine('Action monitoring has been resumed');
      logger.logBoxEnd();
      logger.log('');
    }

    this.isPaused = snapshot.isPaused;
    this.pauseState = snapshot.pauseState;
  }

  /**
   * Monitor the UPS status and trigger shutdown when necessary
   */
  private async monitor(): Promise<void> {
    logger.log('Starting UPS monitoring...');

    if (!this.config.upsDevices || this.config.upsDevices.length === 0) {
      logger.warn('No UPS devices found in configuration. Daemon will remain idle...');
      // Don't exit - enter idle monitoring mode instead
      await this.idleMonitoring();
      return;
    }

    let lastLogTime = 0; // Track when we last logged status

    // Monitor continuously
    while (this.isRunning) {
      try {
        // Check pause state before each cycle
        this.checkPauseState();

        // Check all UPS devices (polling continues even when paused for visibility)
        await this.checkAllUpsDevices();

        // Log periodic status update
        const currentTime = Date.now();
        if (currentTime - lastLogTime >= TIMING.LOG_INTERVAL_MS) {
          this.logAllUpsStatus();
          lastLogTime = currentTime;
        }

        // Wait before next check
        await this.sleep(this.config.checkInterval);
      } catch (error) {
        logger.error(
          `Error during UPS monitoring: ${error instanceof Error ? error.message : String(error)}`,
        );
        await this.sleep(this.config.checkInterval);
      }
    }

    logger.log('UPS monitoring stopped');
  }

  /**
   * Check status of all UPS devices
   */
  private async checkAllUpsDevices(): Promise<void> {
    for (const ups of this.config.upsDevices) {
      try {
        const initialStatus = ensureUpsStatus(this.upsStatus.get(ups.id), ups);
        this.upsStatus.set(ups.id, initialStatus);

        // Check UPS status via configured protocol
        const protocol = ups.protocol || 'snmp';
        const status = protocol === 'upsd' && ups.upsd
          ? await this.protocolResolver.getUpsStatus('upsd', undefined, ups.upsd)
          : await this.protocolResolver.getUpsStatus('snmp', ups.snmp);
        const currentTime = Date.now();

        const currentStatus = this.upsStatus.get(ups.id);
        const pollSnapshot = buildSuccessfulUpsPollSnapshot(
          ups,
          status,
          currentStatus,
          currentTime,
        );

        if (pollSnapshot.transition === 'recovered' && pollSnapshot.previousStatus) {
          logger.log('');
          logger.logBoxTitle(`UPS Recovered: ${ups.name}`, 60, 'success');
          logger.logBoxLine(`UPS is reachable again after ${pollSnapshot.downtimeSeconds} seconds`);
          logger.logBoxLine(`Current Status: ${formatPowerStatus(status.powerStatus)}`);
          logger.logBoxLine(`Time: ${new Date().toISOString()}`);
          logger.logBoxEnd();
          logger.log('');

          // Trigger power status change action for recovery
          await this.triggerUpsActions(
            ups,
            pollSnapshot.updatedStatus,
            pollSnapshot.previousStatus,
            'powerStatusChange',
          );
        } else if (pollSnapshot.transition === 'powerStatusChange' && pollSnapshot.previousStatus) {
          logger.log('');
          logger.logBoxTitle(`Power Status Change: ${ups.name}`, 60, 'warning');
          logger.logBoxLine(
            `Previous: ${formatPowerStatus(pollSnapshot.previousStatus.powerStatus)}`,
          );
          logger.logBoxLine(`Current:  ${formatPowerStatus(status.powerStatus)}`);
          logger.logBoxLine(`Time: ${new Date().toISOString()}`);
          logger.logBoxEnd();
          logger.log('');

          // Trigger actions for power status change
          await this.triggerUpsActions(
            ups,
            pollSnapshot.updatedStatus,
            pollSnapshot.previousStatus,
            'powerStatusChange',
          );
        }

        const thresholdStates = getActionThresholdStates(
          status.powerStatus,
          status.batteryCapacity,
          status.batteryRuntime,
          ups.actions,
        );
        const enteredThresholdIndexes = this.trackEnteredThresholdIndexes(
          `ups:${ups.id}`,
          thresholdStates,
        );

        if (enteredThresholdIndexes.length > 0) {
          await this.triggerUpsActions(
            ups,
            pollSnapshot.updatedStatus,
            pollSnapshot.previousStatus,
            'thresholdViolation',
            enteredThresholdIndexes,
          );
        }

        // Update the status in the map
        this.upsStatus.set(ups.id, pollSnapshot.updatedStatus);
      } catch (error) {
        const currentTime = Date.now();
        const currentStatus = this.upsStatus.get(ups.id);
        const failureSnapshot = buildFailedUpsPollSnapshot(ups, currentStatus, currentTime);

        logger.error(
          `Error checking UPS ${ups.name} (${ups.id}) [failure ${failureSnapshot.failures}/${NETWORK.CONSECUTIVE_FAILURE_THRESHOLD}]: ${
            error instanceof Error ? error.message : String(error)
          }`,
        );

        if (failureSnapshot.transition === 'unreachable' && failureSnapshot.previousStatus) {
          logger.log('');
          logger.logBoxTitle(`UPS Unreachable: ${ups.name}`, 60, 'error');
          logger.logBoxLine(`${failureSnapshot.failures} consecutive communication failures`);
          logger.logBoxLine(
            `Last known status: ${formatPowerStatus(failureSnapshot.previousStatus.powerStatus)}`,
          );
          logger.logBoxLine(`Time: ${new Date().toISOString()}`);
          logger.logBoxEnd();
          logger.log('');

          // Trigger power status change action for unreachable
          await this.triggerUpsActions(
            ups,
            failureSnapshot.updatedStatus,
            failureSnapshot.previousStatus,
            'powerStatusChange',
          );
        }

        this.upsStatus.set(ups.id, failureSnapshot.updatedStatus);
      }
    }

    await this.checkGroupActions();
  }

  private trackEnteredThresholdIndexes(sourceKey: string, currentStates: boolean[]): number[] {
    const previousStates = this.thresholdState.get(sourceKey);
    const enteredIndexes = getEnteredThresholdIndexes(previousStates, currentStates);
    this.thresholdState.set(sourceKey, [...currentStates]);
    return enteredIndexes;
  }

  private getGroupActionIdentity(group: IGroupConfig): { id: string; name: string } {
    return {
      id: group.id,
      name: `Group ${group.name}`,
    };
  }

  private async checkGroupActions(): Promise<void> {
    for (const group of this.config.groups || []) {
      const groupIdentity = this.getGroupActionIdentity(group);
      const memberStatuses = this.config.upsDevices
        .filter((ups) => ups.groups?.includes(group.id))
        .map((ups) => this.upsStatus.get(ups.id))
        .filter((status): status is IUpsStatus => !!status);

      if (memberStatuses.length === 0) {
        continue;
      }

      const currentTime = Date.now();
      const pollSnapshot = buildGroupStatusSnapshot(
        groupIdentity,
        group.mode,
        memberStatuses,
        this.groupStatus.get(group.id),
        currentTime,
      );

      if (pollSnapshot.transition === 'powerStatusChange' && pollSnapshot.previousStatus) {
        logger.log('');
        logger.logBoxTitle(`Group Power Status Change: ${group.name}`, 60, 'warning');
        logger.logBoxLine(
          `Previous: ${formatPowerStatus(pollSnapshot.previousStatus.powerStatus)}`,
        );
        logger.logBoxLine(`Current:  ${formatPowerStatus(pollSnapshot.updatedStatus.powerStatus)}`);
        logger.logBoxLine(`Members:  ${memberStatuses.map((status) => status.name).join(', ')}`);
        logger.logBoxLine(`Time: ${new Date().toISOString()}`);
        logger.logBoxEnd();
        logger.log('');

        await this.triggerGroupActions(
          group,
          pollSnapshot.updatedStatus,
          pollSnapshot.previousStatus,
          'powerStatusChange',
        );
      }

      const thresholdEvaluations = (group.actions || []).map((action) =>
        evaluateGroupActionThreshold(action, group.mode, memberStatuses)
      );
      const thresholdStates = thresholdEvaluations.map((evaluation) =>
        evaluation.exceedsThreshold && !evaluation.blockedByUnreachable
      );
      const enteredThresholdIndexes = this.trackEnteredThresholdIndexes(
        `group:${group.id}`,
        thresholdStates,
      );

      if (enteredThresholdIndexes.length > 0) {
        const thresholdStatus = buildGroupThresholdContextStatus(
          groupIdentity,
          thresholdEvaluations,
          enteredThresholdIndexes,
          pollSnapshot.updatedStatus,
          currentTime,
        );
        await this.triggerGroupActions(
          group,
          thresholdStatus,
          pollSnapshot.previousStatus,
          'thresholdViolation',
          enteredThresholdIndexes,
        );
      }

      this.groupStatus.set(group.id, pollSnapshot.updatedStatus);
    }
  }

  /**
   * Log status of all UPS devices
   */
  private logAllUpsStatus(): void {
    const timestamp = new Date().toISOString();

    logger.log('');
    const pauseLabel = this.isPaused ? ' [PAUSED]' : '';
    logger.logBoxTitle(
      `Periodic Status Update${pauseLabel}`,
      70,
      this.isPaused ? 'warning' : 'info',
    );
    logger.logBoxLine(`Timestamp: ${timestamp}`);
    if (this.isPaused && this.pauseState) {
      logger.logBoxLine(`Actions paused by: ${this.pauseState.pausedBy}`);
      if (this.pauseState.resumeAt) {
        const remaining = Math.round((this.pauseState.resumeAt - Date.now()) / 1000);
        logger.logBoxLine(`Auto-resume in: ${remaining > 0 ? remaining : 0} seconds`);
      }
    }
    logger.logBoxEnd();
    logger.log('');

    // Build table data
    const columns: Array<
      { header: string; key: string; align?: 'left' | 'right'; color?: (val: string) => string }
    > = [
      { header: 'UPS Name', key: 'name', align: 'left', color: theme.highlight },
      { header: 'ID', key: 'id', align: 'left', color: theme.dim },
      { header: 'Power Status', key: 'powerStatus', align: 'left' },
      { header: 'Battery', key: 'battery', align: 'right' },
      { header: 'Runtime', key: 'runtime', align: 'right' },
    ];

    const rows: Array<Record<string, string>> = [];
    for (const [id, status] of this.upsStatus.entries()) {
      const batteryColor = getBatteryColor(status.batteryCapacity);
      const runtimeColor = getRuntimeColor(status.batteryRuntime);

      rows.push({
        name: status.name,
        id: id,
        powerStatus: formatPowerStatus(status.powerStatus),
        battery: batteryColor(status.batteryCapacity + '%'),
        runtime: runtimeColor(status.batteryRuntime + ' min'),
      });
    }

    logger.logTable(columns, rows);
    logger.log('');
  }

  /**
   * Trigger actions for a UPS device
   * @param ups UPS configuration
   * @param status Current UPS status
   * @param previousStatus Previous UPS status (for determining previousPowerStatus)
   * @param triggerReason Why actions are being triggered
   */
  private async triggerUpsActions(
    ups: IUpsConfig,
    status: IUpsStatus,
    previousStatus: IUpsStatus | undefined,
    triggerReason: TUpsTriggerReason,
    actionIndexes?: number[],
  ): Promise<void> {
    const decision = decideUpsActionExecution(
      this.isPaused,
      ups,
      status,
      previousStatus,
      triggerReason,
    );

    if (decision.type === 'suppressed') {
      logger.info(decision.message);
      return;
    }

    if (decision.type === 'legacyShutdown') {
      await this.initiateShutdown(decision.reason);
      return;
    }

    if (decision.type === 'skip') {
      return;
    }

    const selectedActions = actionIndexes
      ? decision.actions.filter((_action, index) => actionIndexes.includes(index))
      : decision.actions;

    if (selectedActions.length === 0) {
      return;
    }

    const actions = applyDefaultShutdownDelay(
      selectedActions,
      this.getDefaultShutdownDelayMinutes(),
    );

    await ActionManager.executeActions(actions, decision.context);
  }

  private async triggerGroupActions(
    group: IGroupConfig,
    status: IUpsStatus,
    previousStatus: IUpsStatus | undefined,
    triggerReason: TUpsTriggerReason,
    actionIndexes?: number[],
  ): Promise<void> {
    if (this.isPaused) {
      logger.info(
        `[PAUSED] Actions suppressed for Group ${group.name} (trigger: ${triggerReason})`,
      );
      return;
    }

    const configuredActions = group.actions || [];
    if (configuredActions.length === 0) {
      return;
    }

    const selectedActions = actionIndexes
      ? configuredActions.filter((_action, index) => actionIndexes.includes(index))
      : configuredActions;

    if (selectedActions.length === 0) {
      return;
    }

    const actions = applyDefaultShutdownDelay(
      selectedActions,
      this.getDefaultShutdownDelayMinutes(),
    );
    const context = buildUpsActionContext(
      this.getGroupActionIdentity(group),
      status,
      previousStatus,
      triggerReason,
    );

    await ActionManager.executeActions(actions, context);
  }

  /**
   * Initiate system shutdown with UPS monitoring during shutdown
   * @param reason Reason for shutdown
   */
  public async initiateShutdown(reason: string): Promise<void> {
    logger.log(`Initiating system shutdown due to: ${reason}`);

    const shutdownDelayMinutes = this.getDefaultShutdownDelayMinutes();

    try {
      await this.shutdownExecutor.scheduleShutdown(shutdownDelayMinutes);
      logger.log(`Allowing ${shutdownDelayMinutes} minutes for VMs to shut down safely`);

      // Monitor UPS during shutdown and force immediate shutdown if battery gets too low
      logger.log('Monitoring UPS during shutdown process...');
      await this.monitorDuringShutdown();
    } catch (error) {
      logger.error(`Failed to initiate shutdown: ${error}`);

      const shutdownTriggered = await this.shutdownExecutor.tryScheduledAlternatives();
      if (!shutdownTriggered) {
        logger.error('All shutdown methods failed');
      }
    }
  }

  /**
   * Monitor UPS during system shutdown
   * Force immediate shutdown if any UPS gets critically low
   */
  private async monitorDuringShutdown(): Promise<void> {
    const startTime = Date.now();

    logger.log('');
    logger.logBoxTitle('Shutdown Monitoring Active', UI.WIDE_BOX_WIDTH, 'warning');
    logger.logBoxLine(
      `Emergency threshold: ${THRESHOLDS.EMERGENCY_RUNTIME_MINUTES} minutes runtime`,
    );
    logger.logBoxLine(`Check interval: ${TIMING.SHUTDOWN_CHECK_INTERVAL_MS / 1000} seconds`);
    logger.logBoxLine(`Max monitoring time: ${TIMING.MAX_SHUTDOWN_MONITORING_MS / 1000} seconds`);
    logger.logBoxEnd();
    logger.log('');

    // Continue monitoring until max monitoring time is reached
    while (Date.now() - startTime < TIMING.MAX_SHUTDOWN_MONITORING_MS) {
      try {
        logger.info('Checking UPS status during shutdown...');

        // Build table for UPS status during shutdown
        const columns: Array<
          { header: string; key: string; align?: 'left' | 'right'; color?: (val: string) => string }
        > = [
          { header: 'UPS Name', key: 'name', align: 'left', color: theme.highlight },
          { header: 'Battery', key: 'battery', align: 'right' },
          { header: 'Runtime', key: 'runtime', align: 'right' },
          { header: 'Status', key: 'status', align: 'left' },
        ];

        const rows: Array<Record<string, string>> = [];
        let emergencyUps: { ups: IUpsConfig; status: ISnmpUpsStatus } | null = null;

        // Check all UPS devices
        for (const ups of this.config.upsDevices) {
          try {
            const protocol = ups.protocol || 'snmp';
            const status = protocol === 'upsd' && ups.upsd
              ? await this.protocolResolver.getUpsStatus('upsd', undefined, ups.upsd)
              : await this.protocolResolver.getUpsStatus('snmp', ups.snmp);
            const rowSnapshot = buildShutdownStatusRow(
              ups.name,
              status,
              THRESHOLDS.EMERGENCY_RUNTIME_MINUTES,
              {
                battery: (batteryCapacity) =>
                  getBatteryColor(batteryCapacity)(`${batteryCapacity}%`),
                runtime: (batteryRuntime) =>
                  getRuntimeColor(batteryRuntime)(`${batteryRuntime} min`),
                ok: theme.success,
                critical: theme.error,
                error: theme.error,
              },
            );

            rows.push(rowSnapshot.row);
            emergencyUps = selectEmergencyCandidate(
              emergencyUps,
              ups,
              status,
              THRESHOLDS.EMERGENCY_RUNTIME_MINUTES,
            );
          } catch (upsError) {
            rows.push(buildShutdownErrorRow(ups.name, theme.error));

            logger.error(
              `Error checking UPS ${ups.name} during shutdown: ${
                upsError instanceof Error ? upsError.message : String(upsError)
              }`,
            );
          }
        }

        // Display the table
        logger.logTable(columns, rows);
        logger.log('');

        // If emergency detected, trigger immediate shutdown
        if (emergencyUps) {
          logger.log('');
          logger.logBoxTitle('EMERGENCY SHUTDOWN', 60, 'error');
          logger.logBoxLine(
            `UPS ${emergencyUps.ups.name} runtime critically low: ${emergencyUps.status.batteryRuntime} minutes`,
          );
          logger.logBoxLine(`Emergency threshold: ${THRESHOLDS.EMERGENCY_RUNTIME_MINUTES} minutes`);
          logger.logBoxLine('Forcing immediate shutdown!');
          logger.logBoxEnd();
          logger.log('');

          // Force immediate shutdown
          await this.forceImmediateShutdown();
          return;
        }

        // Wait before checking again
        await this.sleep(TIMING.SHUTDOWN_CHECK_INTERVAL_MS);
      } catch (error) {
        logger.error(
          `Error monitoring UPS during shutdown: ${
            error instanceof Error ? error.message : String(error)
          }`,
        );
        await this.sleep(TIMING.SHUTDOWN_CHECK_INTERVAL_MS);
      }
    }

    logger.log('');
    logger.success('UPS monitoring during shutdown completed');
    logger.log('');
  }

  /**
   * Force an immediate system shutdown
   */
  private async forceImmediateShutdown(): Promise<void> {
    try {
      await this.shutdownExecutor.forceImmediateShutdown();
    } catch (error) {
      logger.error('Emergency shutdown failed, trying alternative methods...');

      const shutdownTriggered = await this.shutdownExecutor.tryEmergencyAlternatives();
      if (!shutdownTriggered) {
        logger.error('All emergency shutdown methods failed');
      }
    }
  }

  /**
   * Idle monitoring loop when no UPS devices are configured
   * Watches for config changes and reloads when detected
   */
  private async idleMonitoring(): Promise<void> {
    let lastConfigCheck = Date.now();

    logger.log('Entering idle monitoring mode...');
    logger.log(
      `Daemon will check for config changes every ${TIMING.IDLE_CHECK_INTERVAL_MS / 1000} seconds`,
    );

    // Start file watcher for hot-reload
    this.watchConfigFile();

    while (this.isRunning) {
      try {
        const currentTime = Date.now();

        // Periodically check if config has been updated
        if (currentTime - lastConfigCheck >= TIMING.CONFIG_CHECK_INTERVAL_MS) {
          try {
            // Try to load config
            const newConfig = await this.loadConfig();

            // Check if we now have UPS devices configured
            if (newConfig.upsDevices && newConfig.upsDevices.length > 0) {
              logger.success('Configuration updated! UPS devices found. Starting monitoring...');
              this.initializeUpsStatus();
              // Exit idle mode and start monitoring
              await this.monitor();
              return;
            }
          } catch (error) {
            // Config still doesn't exist or invalid, continue waiting
          }

          lastConfigCheck = currentTime;
        }

        await this.sleep(TIMING.IDLE_CHECK_INTERVAL_MS);
      } catch (error) {
        logger.error(
          `Error during idle monitoring: ${error instanceof Error ? error.message : String(error)}`,
        );
        await this.sleep(TIMING.IDLE_CHECK_INTERVAL_MS);
      }
    }

    logger.log('Idle monitoring stopped');
  }

  /**
   * Watch config file for changes and reload automatically
   */
  private watchConfigFile(): void {
    try {
      // Use Deno's file watcher to monitor config file
      const configDir = path.dirname(this.CONFIG_PATH);

      // Spawn a background watcher (non-blocking)
      (async () => {
        try {
          const watcher = Deno.watchFs(configDir);

          logger.log('Config file watcher started');

          for await (const event of watcher) {
            // Respond to modify events on config file
            if (shouldReloadConfig(event)) {
              logger.info('Config file changed, reloading...');
              await this.reloadConfig();
            }

            // Detect pause file changes
            if (shouldRefreshPauseState(event)) {
              this.checkPauseState();
            }

            // Stop watching if daemon stopped
            if (!this.isRunning) {
              break;
            }
          }
        } catch (error) {
          // Watcher error - not critical, just log it
          logger.dim(
            `Config watcher stopped: ${error instanceof Error ? error.message : String(error)}`,
          );
        }
      })();
    } catch (error) {
      // If we can't start the watcher, just log and continue
      // The periodic check will still work
      logger.dim('Could not start config file watcher, using periodic checks only');
    }
  }

  /**
   * Reload configuration and restart monitoring if needed
   */
  private async reloadConfig(): Promise<void> {
    try {
      const oldDeviceCount = this.config.upsDevices?.length || 0;

      // Load the new configuration
      await this.loadConfig();
      this.thresholdState.clear();
      this.groupStatus.clear();
      const newDeviceCount = this.config.upsDevices?.length || 0;

      const reloadSnapshot = analyzeConfigReload(oldDeviceCount, newDeviceCount);
      logger.success(reloadSnapshot.message);

      if (reloadSnapshot.shouldLogMonitoringStart) {
        logger.info('Monitoring will start automatically...');
      }

      if (reloadSnapshot.shouldInitializeUpsStatus) {
        // Reinitialize UPS status tracking
        this.initializeUpsStatus();
      }
    } catch (error) {
      logger.warn(
        `Failed to reload config: ${error instanceof Error ? error.message : String(error)}`,
      );
    }
  }

  /**
   * Sleep for the specified milliseconds
   */
  private sleep(ms: number): Promise<void> {
    return new Promise((resolve) => setTimeout(resolve, ms));
  }
}