import { execSync } from 'node:child_process';
import { Nupst } from './nupst.ts';
import { logger } from './logger.ts';

/**
 * Class for handling CLI commands
 * Provides interface between user commands and the application
 */
export class NupstCli {
  private readonly nupst: Nupst;

  /**
   * Create a new CLI handler
   */
  constructor() {
    this.nupst = new Nupst();
  }

  /**
   * Parse command line arguments and execute the appropriate command
   * @param args Command line arguments (process.argv)
   */
  public async parseAndExecute(args: string[]): Promise<void> {
    // Extract debug and version flags from any position
    const debugOptions = this.extractDebugOptions(args);
    if (debugOptions.debugMode) {
      logger.log('Debug mode enabled');
      // Enable debug mode in the SNMP client
      this.nupst.getSnmp().enableDebug();
    }

    // Check for version flag
    if (debugOptions.cleanedArgs.includes('--version') || debugOptions.cleanedArgs.includes('-v')) {
      this.showVersion();
      return;
    }

    // Get the command (default to help if none provided)
    const command = debugOptions.cleanedArgs[2] || 'help';
    const commandArgs = debugOptions.cleanedArgs.slice(3);

    // Route to the appropriate command handler
    await this.executeCommand(command, commandArgs, debugOptions.debugMode);
  }

  /**
   * Extract and remove debug options from args
   * @param args Command line arguments
   * @returns Object with debug flags and cleaned args
   */
  private extractDebugOptions(args: string[]): { debugMode: boolean; cleanedArgs: string[] } {
    const debugMode = args.includes('--debug') || args.includes('-d');
    // Remove debug flags from args
    const cleanedArgs = args.filter((arg) => arg !== '--debug' && arg !== '-d');

    return { debugMode, cleanedArgs };
  }

  /**
   * Execute the command with the given arguments
   * @param command Command to execute
   * @param commandArgs Additional command arguments
   * @param debugMode Whether debug mode is enabled
   */
  private async executeCommand(
    command: string,
    commandArgs: string[],
    debugMode: boolean,
  ): Promise<void> {
    // Get access to the handlers
    const upsHandler = this.nupst.getUpsHandler();
    const groupHandler = this.nupst.getGroupHandler();
    const serviceHandler = this.nupst.getServiceHandler();

    // Handle service subcommands
    if (command === 'service') {
      const subcommand = commandArgs[0] || 'status';

      switch (subcommand) {
        case 'enable':
          await serviceHandler.enable();
          break;
        case 'disable':
          await serviceHandler.disable();
          break;
        case 'start':
          await serviceHandler.start();
          break;
        case 'stop':
          await serviceHandler.stop();
          break;
        case 'restart':
          await serviceHandler.stop();
          await new Promise((resolve) => setTimeout(resolve, 2000)); // Wait 2s
          await serviceHandler.start();
          break;
        case 'status':
          await serviceHandler.status();
          break;
        case 'logs':
          await serviceHandler.logs();
          break;
        case 'start-daemon':
          await serviceHandler.daemonStart(debugMode);
          break;
        default:
          this.showServiceHelp();
          break;
      }
      return;
    }

    // Handle UPS subcommands
    if (command === 'ups') {
      const subcommand = commandArgs[0] || 'list';
      const subcommandArgs = commandArgs.slice(1);

      switch (subcommand) {
        case 'add':
          await upsHandler.add();
          break;
        case 'edit': {
          const upsId = subcommandArgs[0];
          await upsHandler.edit(upsId);
          break;
        }
        case 'remove':
        case 'rm': // Alias
        case 'delete': { // Backward compatibility
          const upsIdToRemove = subcommandArgs[0];
          if (!upsIdToRemove) {
            logger.error('UPS ID is required for remove command');
            this.showUpsHelp();
            return;
          }
          await upsHandler.remove(upsIdToRemove);
          break;
        }
        case 'list':
        case 'ls': // Alias
          await upsHandler.list();
          break;
        case 'test':
          await upsHandler.test(debugMode);
          break;
        default:
          this.showUpsHelp();
          break;
      }
      return;
    }

    // Handle group subcommands
    if (command === 'group') {
      const subcommand = commandArgs[0] || 'list';
      const subcommandArgs = commandArgs.slice(1);

      switch (subcommand) {
        case 'add':
          await groupHandler.add();
          break;
        case 'edit': {
          const groupId = subcommandArgs[0];
          if (!groupId) {
            logger.error('Group ID is required for edit command');
            this.showGroupHelp();
            return;
          }
          await groupHandler.edit(groupId);
          break;
        }
        case 'remove':
        case 'rm': // Alias
        case 'delete': { // Backward compatibility
          const groupIdToRemove = subcommandArgs[0];
          if (!groupIdToRemove) {
            logger.error('Group ID is required for remove command');
            this.showGroupHelp();
            return;
          }
          await groupHandler.remove(groupIdToRemove);
          break;
        }
        case 'list':
        case 'ls': // Alias
          await groupHandler.list();
          break;
        default:
          this.showGroupHelp();
          break;
      }
      return;
    }

    // Handle config subcommand
    if (command === 'config') {
      const subcommand = commandArgs[0] || 'show';

      switch (subcommand) {
        case 'show':
        case 'display':
          await this.showConfig();
          break;
        default:
          await this.showConfig();
          break;
      }
      return;
    }

    // Handle top-level commands and backward compatibility
    switch (command) {
      // Backward compatibility - old UPS commands
      case 'add':
        logger.log("Note: 'nupst add' is deprecated. Use 'nupst ups add' instead.");
        await upsHandler.add();
        break;
      case 'edit':
        logger.log("Note: 'nupst edit' is deprecated. Use 'nupst ups edit' instead.");
        await upsHandler.edit(commandArgs[0]);
        break;
      case 'delete':
        logger.log("Note: 'nupst delete' is deprecated. Use 'nupst ups remove' instead.");
        if (!commandArgs[0]) {
          logger.error('UPS ID is required for delete command');
          this.showHelp();
          return;
        }
        await upsHandler.remove(commandArgs[0]);
        break;
      case 'list':
        logger.log("Note: 'nupst list' is deprecated. Use 'nupst ups list' instead.");
        await upsHandler.list();
        break;
      case 'test':
        logger.log("Note: 'nupst test' is deprecated. Use 'nupst ups test' instead.");
        await upsHandler.test(debugMode);
        break;
      case 'setup':
        logger.log("Note: 'nupst setup' is deprecated. Use 'nupst ups edit' instead.");
        await upsHandler.edit(undefined);
        break;

      // Backward compatibility - old service commands
      case 'enable':
        logger.log("Note: 'nupst enable' is deprecated. Use 'nupst service enable' instead.");
        await serviceHandler.enable();
        break;
      case 'disable':
        logger.log("Note: 'nupst disable' is deprecated. Use 'nupst service disable' instead.");
        await serviceHandler.disable();
        break;
      case 'start':
        logger.log("Note: 'nupst start' is deprecated. Use 'nupst service start' instead.");
        await serviceHandler.start();
        break;
      case 'stop':
        logger.log("Note: 'nupst stop' is deprecated. Use 'nupst service stop' instead.");
        await serviceHandler.stop();
        break;
      case 'status':
        logger.log("Note: 'nupst status' is deprecated. Use 'nupst service status' instead.");
        await serviceHandler.status();
        break;
      case 'logs':
        logger.log("Note: 'nupst logs' is deprecated. Use 'nupst service logs' instead.");
        await serviceHandler.logs();
        break;
      case 'daemon-start':
        logger.log(
          "Note: 'nupst daemon-start' is deprecated. Use 'nupst service start-daemon' instead.",
        );
        await serviceHandler.daemonStart(debugMode);
        break;

      // Top-level commands (no changes)
      case 'update':
        await serviceHandler.update();
        break;
      case 'uninstall':
        await serviceHandler.uninstall();
        break;
      case 'help':
      case '--help':
      case '-h':
        this.showHelp();
        break;
      default:
        logger.error(`Unknown command: ${command}`);
        logger.log('');
        this.showHelp();
        break;
    }
  }

  /**
   * Display the current configuration
   */
  private async showConfig(): Promise<void> {
    try {
      // Try to load configuration
      try {
        await this.nupst.getDaemon().loadConfig();
      } catch (_error) {
        const errorBoxWidth = 45;
        logger.logBoxTitle('Configuration Error', errorBoxWidth);
        logger.logBoxLine('No configuration found.');
        logger.logBoxLine("Please run 'nupst setup' first to create a configuration.");
        logger.logBoxEnd();
        return;
      }

      // Get current configuration
      const config = this.nupst.getDaemon().getConfig();

      const boxWidth = 50;
      logger.logBoxTitle('NUPST Configuration', boxWidth);

      // Check if multi-UPS config
      if (config.upsDevices && Array.isArray(config.upsDevices)) {
        // Multi-UPS configuration
        logger.logBoxLine(`UPS Devices: ${config.upsDevices.length}`);
        logger.logBoxLine(`Groups: ${config.groups ? config.groups.length : 0}`);
        logger.logBoxLine(`Check Interval: ${config.checkInterval / 1000} seconds`);
        logger.logBoxLine('');
        logger.logBoxLine('Configuration File Location:');
        logger.logBoxLine('  /etc/nupst/config.json');
        logger.logBoxEnd();

        // Show UPS devices
        if (config.upsDevices.length > 0) {
          logger.logBoxTitle('UPS Devices', boxWidth);
          for (const ups of config.upsDevices) {
            logger.logBoxLine(`${ups.name} (${ups.id}):`);
            logger.logBoxLine(`  Host: ${ups.snmp.host}:${ups.snmp.port}`);
            logger.logBoxLine(`  Model: ${ups.snmp.upsModel}`);
            logger.logBoxLine(
              `  Thresholds: ${ups.thresholds.battery}% battery, ${ups.thresholds.runtime} min runtime`,
            );
            logger.logBoxLine(
              `  Groups: ${ups.groups.length > 0 ? ups.groups.join(', ') : 'None'}`,
            );
            logger.logBoxLine('');
          }
          logger.logBoxEnd();
        }

        // Show groups
        if (config.groups && config.groups.length > 0) {
          logger.logBoxTitle('UPS Groups', boxWidth);
          for (const group of config.groups) {
            logger.logBoxLine(`${group.name} (${group.id}):`);
            logger.logBoxLine(`  Mode: ${group.mode}`);
            if (group.description) {
              logger.logBoxLine(`  Description: ${group.description}`);
            }

            // List UPS devices in this group
            const upsInGroup = config.upsDevices.filter((ups) =>
              ups.groups && ups.groups.includes(group.id)
            );
            logger.logBoxLine(
              `  UPS Devices: ${
                upsInGroup.length > 0 ? upsInGroup.map((ups) => ups.name).join(', ') : 'None'
              }`,
            );
            logger.logBoxLine('');
          }
          logger.logBoxEnd();
        }
      } else {
        // Legacy single UPS configuration
        if (!config.snmp) {
          logger.logBoxLine('Error: Legacy configuration missing SNMP settings');
        } else {
          // SNMP Settings
          logger.logBoxLine('SNMP Settings:');
          logger.logBoxLine(`  Host: ${config.snmp.host}`);
          logger.logBoxLine(`  Port: ${config.snmp.port}`);
          logger.logBoxLine(`  Version: ${config.snmp.version}`);
          logger.logBoxLine(`  UPS Model: ${config.snmp.upsModel || 'cyberpower'}`);

          if (config.snmp.version === 1 || config.snmp.version === 2) {
            logger.logBoxLine(`  Community: ${config.snmp.community}`);
          } else if (config.snmp.version === 3) {
            logger.logBoxLine(`  Security Level: ${config.snmp.securityLevel}`);
            logger.logBoxLine(`  Username: ${config.snmp.username}`);

            // Show auth and privacy details based on security level
            if (
              config.snmp.securityLevel === 'authNoPriv' ||
              config.snmp.securityLevel === 'authPriv'
            ) {
              logger.logBoxLine(`  Auth Protocol: ${config.snmp.authProtocol || 'None'}`);
            }

            if (config.snmp.securityLevel === 'authPriv') {
              logger.logBoxLine(`  Privacy Protocol: ${config.snmp.privProtocol || 'None'}`);
            }

            // Show timeout value
            logger.logBoxLine(`  Timeout: ${config.snmp.timeout / 1000} seconds`);
          }

          // Show OIDs if custom model is selected
          if (config.snmp.upsModel === 'custom' && config.snmp.customOIDs) {
            logger.logBoxLine('Custom OIDs:');
            logger.logBoxLine(
              `  Power Status: ${config.snmp.customOIDs.POWER_STATUS || 'Not set'}`,
            );
            logger.logBoxLine(
              `  Battery Capacity: ${config.snmp.customOIDs.BATTERY_CAPACITY || 'Not set'}`,
            );
            logger.logBoxLine(
              `  Battery Runtime: ${config.snmp.customOIDs.BATTERY_RUNTIME || 'Not set'}`,
            );
          }
        }

        // Thresholds
        if (!config.thresholds) {
          logger.logBoxLine('Error: Legacy configuration missing threshold settings');
        } else {
          logger.logBoxLine('Thresholds:');
          logger.logBoxLine(`  Battery: ${config.thresholds.battery}%`);
          logger.logBoxLine(`  Runtime: ${config.thresholds.runtime} minutes`);
        }
        logger.logBoxLine(`Check Interval: ${config.checkInterval / 1000} seconds`);

        // Configuration file location
        logger.logBoxLine('');
        logger.logBoxLine('Configuration File Location:');
        logger.logBoxLine('  /etc/nupst/config.json');
        logger.logBoxLine('');
        logger.logBoxLine('Note: Using legacy single-UPS configuration format.');
        logger.logBoxLine('Consider using "nupst add" to migrate to multi-UPS format.');

        logger.logBoxEnd();
      }

      // Show service status
      try {
        const isActive =
          execSync('systemctl is-active nupst.service || true').toString().trim() === 'active';
        const isEnabled =
          execSync('systemctl is-enabled nupst.service || true').toString().trim() === 'enabled';

        const statusBoxWidth = 45;
        logger.logBoxTitle('Service Status', statusBoxWidth);
        logger.logBoxLine(`Service Active: ${isActive ? 'Yes' : 'No'}`);
        logger.logBoxLine(`Service Enabled: ${isEnabled ? 'Yes' : 'No'}`);
        logger.logBoxEnd();
      } catch (_error) {
        // Ignore errors checking service status
      }
    } catch (error) {
      logger.error(
        `Failed to display configuration: ${
          error instanceof Error ? error.message : String(error)
        }`,
      );
    }
  }

  /**
   * Display version information
   */
  private showVersion(): void {
    const version = this.nupst.getVersion();
    logger.log(`NUPST version ${version}`);
    logger.log('Deno-powered UPS monitoring tool');
  }

  /**
   * Display help message
   */
  private showHelp(): void {
    logger.log(`
NUPST - UPS Shutdown Tool

Usage:
  nupst <command> [options]

Commands:
  service <subcommand>      - Manage systemd service
  ups <subcommand>          - Manage UPS devices
  group <subcommand>        - Manage UPS groups
  config [show]             - Display current configuration
  update                    - Update NUPST from repository (requires root)
  uninstall                 - Completely remove NUPST from system (requires root)
  help, --help, -h          - Show this help message
  --version, -v             - Show version information

Service Subcommands:
  nupst service enable      - Install and enable systemd service (requires root)
  nupst service disable     - Stop and disable systemd service (requires root)
  nupst service start       - Start the systemd service
  nupst service stop        - Stop the systemd service
  nupst service restart     - Restart the systemd service
  nupst service status      - Show service and UPS status
  nupst service logs        - Show service logs in real-time
  nupst service start-daemon - Start daemon process directly

UPS Subcommands:
  nupst ups add             - Add a new UPS device
  nupst ups edit [id]       - Edit a UPS device (default if no ID)
  nupst ups remove <id>     - Remove a UPS device by ID
  nupst ups list (or ls)    - List all configured UPS devices
  nupst ups test            - Test UPS connections

Group Subcommands:
  nupst group add           - Add a new UPS group
  nupst group edit <id>     - Edit an existing UPS group
  nupst group remove <id>   - Remove a UPS group by ID
  nupst group list (or ls)  - List all UPS groups

Options:
  --debug, -d              - Enable debug mode for detailed SNMP logging
                             (Example: nupst ups test --debug)

Examples:
  nupst service enable     - Install and start the service
  nupst ups add            - Add a new UPS interactively
  nupst group list         - Show all configured groups
  nupst config             - Display current configuration

Note: Old command format (e.g., 'nupst add') still works but is deprecated.
      Use the new format (e.g., 'nupst ups add') going forward.
`);
  }

  /**
   * Display help message for service commands
   */
  private showServiceHelp(): void {
    logger.log(`
NUPST - Service Management Commands

Usage:
  nupst service <subcommand>

Subcommands:
  enable                   - Install and enable the systemd service (requires root)
  disable                  - Stop and disable the systemd service (requires root)
  start                    - Start the systemd service
  stop                     - Stop the systemd service
  restart                  - Restart the systemd service
  status                   - Show service status and UPS information
  logs                     - Show service logs in real-time
  start-daemon             - Start the daemon process directly (for testing)

Options:
  --debug, -d             - Enable debug mode for detailed logging
`);
  }

  /**
   * Display help message for UPS commands
   */
  private showUpsHelp(): void {
    logger.log(`
NUPST - UPS Management Commands

Usage:
  nupst ups <subcommand> [arguments]

Subcommands:
  add                      - Add a new UPS device interactively
  edit [id]                - Edit a UPS device (edits default if no ID provided)
  remove <id>              - Remove a UPS device by ID (alias: rm)
  list                     - List all configured UPS devices (alias: ls)
  test                     - Test connections to all configured UPS devices

Options:
  --debug, -d             - Enable debug mode for detailed SNMP logging

Examples:
  nupst ups add           - Add a new UPS device
  nupst ups edit ups-1    - Edit UPS with ID 'ups-1'
  nupst ups remove ups-1  - Remove UPS with ID 'ups-1'
  nupst ups test --debug  - Test all UPS connections with debug output
`);
  }

  /**
   * Display help message for group commands
   */
  private showGroupHelp(): void {
    logger.log(`
NUPST - Group Management Commands

Usage:
  nupst group <subcommand> [arguments]

Subcommands:
  add                      - Add a new UPS group interactively
  edit <id>                - Edit an existing UPS group
  remove <id>              - Remove a UPS group by ID (alias: rm)
  list                     - List all UPS groups (alias: ls)

Options:
  --debug, -d             - Enable debug mode for detailed logging

Examples:
  nupst group add         - Create a new group
  nupst group edit dc-1   - Edit group with ID 'dc-1'
  nupst group remove dc-1 - Remove group with ID 'dc-1'
`);
  }
}