import process from 'node:process';
import { Nupst } from '../nupst.ts';
import { logger, type ITableColumn } from '../logger.ts';
import { theme, symbols } from '../colors.ts';
import type { IActionConfig } from '../actions/base-action.ts';
import type { IUpsConfig, IGroupConfig } from '../daemon.ts';

/**
 * Class for handling action-related CLI commands
 * Provides interface for managing UPS actions
 */
export class ActionHandler {
  private readonly nupst: Nupst;

  /**
   * Create a new action handler
   * @param nupst Reference to the main Nupst instance
   */
  constructor(nupst: Nupst) {
    this.nupst = nupst;
  }

  /**
   * Add a new action to a UPS or group
   */
  public async add(targetId?: string): Promise<void> {
    try {
      if (!targetId) {
        logger.error('Target ID is required');
        logger.log(
          `  ${theme.dim('Usage:')} ${theme.command('nupst action add <ups-id|group-id>')}`,
        );
        logger.log('');
        logger.log(`  ${theme.dim('List UPS devices:')} ${theme.command('nupst ups list')}`);
        logger.log(`  ${theme.dim('List groups:')} ${theme.command('nupst group list')}`);
        logger.log('');
        process.exit(1);
      }

      const config = await this.nupst.getDaemon().loadConfig();

      // Check if it's a UPS
      const ups = config.upsDevices.find((u) => u.id === targetId);
      // Check if it's a group
      const group = config.groups?.find((g) => g.id === targetId);

      if (!ups && !group) {
        logger.error(`UPS or Group with ID '${targetId}' not found`);
        logger.log('');
        logger.log(`  ${theme.dim('List available UPS devices:')} ${theme.command('nupst ups list')}`);
        logger.log(`  ${theme.dim('List available groups:')} ${theme.command('nupst group list')}`);
        logger.log('');
        process.exit(1);
      }

      const target = ups || group;
      const targetType = ups ? 'UPS' : 'Group';
      const targetName = ups ? ups.name : group!.name;

      const readline = await import('node:readline');
      const rl = readline.createInterface({
        input: process.stdin,
        output: process.stdout,
      });

      const prompt = (question: string): Promise<string> => {
        return new Promise((resolve) => {
          rl.question(question, (answer: string) => {
            resolve(answer);
          });
        });
      };

      try {
        logger.log('');
        logger.info(`Add Action to ${targetType} ${theme.highlight(targetName)}`);
        logger.log('');

        // Action type (currently only shutdown is supported)
        const type = 'shutdown';
        logger.log(`  ${theme.dim('Action type:')} ${theme.highlight('shutdown')}`);

        // Battery threshold
        const batteryStr = await prompt(
          `  ${theme.dim('Battery threshold')} ${theme.dim('(%):')} `,
        );
        const battery = parseInt(batteryStr, 10);
        if (isNaN(battery) || battery < 0 || battery > 100) {
          logger.error('Invalid battery threshold. Must be 0-100.');
          process.exit(1);
        }

        // Runtime threshold
        const runtimeStr = await prompt(
          `  ${theme.dim('Runtime threshold')} ${theme.dim('(minutes):')} `,
        );
        const runtime = parseInt(runtimeStr, 10);
        if (isNaN(runtime) || runtime < 0) {
          logger.error('Invalid runtime threshold. Must be >= 0.');
          process.exit(1);
        }

        // Trigger mode
        logger.log('');
        logger.log(`  ${theme.dim('Trigger mode:')}`);
        logger.log(`    ${theme.dim('1)')} onlyPowerChanges - Trigger only when power status changes`);
        logger.log(
          `    ${theme.dim('2)')} onlyThresholds - Trigger only when thresholds are violated`,
        );
        logger.log(
          `    ${theme.dim('3)')} powerChangesAndThresholds - Trigger on power change AND thresholds`,
        );
        logger.log(`    ${theme.dim('4)')} anyChange - Trigger on any status change`);
        const triggerChoice = await prompt(`  ${theme.dim('Choice')} ${theme.dim('[2]:')} `);
        const triggerModeMap: Record<string, string> = {
          '1': 'onlyPowerChanges',
          '2': 'onlyThresholds',
          '3': 'powerChangesAndThresholds',
          '4': 'anyChange',
          '': 'onlyThresholds', // Default
        };
        const triggerMode = triggerModeMap[triggerChoice] || 'onlyThresholds';

        // Shutdown delay
        const delayStr = await prompt(
          `  ${theme.dim('Shutdown delay')} ${theme.dim('(seconds) [5]:')} `,
        );
        const shutdownDelay = delayStr ? parseInt(delayStr, 10) : 5;
        if (isNaN(shutdownDelay) || shutdownDelay < 0) {
          logger.error('Invalid shutdown delay. Must be >= 0.');
          process.exit(1);
        }

        // Create the action
        const newAction: IActionConfig = {
          type,
          thresholds: {
            battery,
            runtime,
          },
          triggerMode: triggerMode as IActionConfig['triggerMode'],
          shutdownDelay,
        };

        // Add to target (UPS or group)
        if (!target!.actions) {
          target!.actions = [];
        }
        target!.actions.push(newAction);

        await this.nupst.getDaemon().saveConfig(config);

        logger.log('');
        logger.success(`Action added to ${targetType} ${targetName}`);
        logger.log(`  ${theme.dim('Changes saved and will be applied automatically')}`);
        logger.log('');
      } finally {
        rl.close();
      }
    } catch (error) {
      logger.error(
        `Failed to add action: ${error instanceof Error ? error.message : String(error)}`,
      );
      process.exit(1);
    }
  }

  /**
   * Remove an action from a UPS or group
   */
  public async remove(targetId?: string, actionIndexStr?: string): Promise<void> {
    try {
      if (!targetId || !actionIndexStr) {
        logger.error('Target ID and action index are required');
        logger.log(
          `  ${theme.dim('Usage:')} ${theme.command('nupst action remove <ups-id|group-id> <action-index>')}`,
        );
        logger.log('');
        logger.log(`  ${theme.dim('List actions:')} ${theme.command('nupst action list')}`);
        logger.log('');
        process.exit(1);
      }

      const actionIndex = parseInt(actionIndexStr, 10);
      if (isNaN(actionIndex) || actionIndex < 0) {
        logger.error('Invalid action index. Must be >= 0.');
        process.exit(1);
      }

      const config = await this.nupst.getDaemon().loadConfig();

      // Check if it's a UPS
      const ups = config.upsDevices.find((u) => u.id === targetId);
      // Check if it's a group
      const group = config.groups?.find((g) => g.id === targetId);

      if (!ups && !group) {
        logger.error(`UPS or Group with ID '${targetId}' not found`);
        logger.log('');
        logger.log(`  ${theme.dim('List available UPS devices:')} ${theme.command('nupst ups list')}`);
        logger.log(`  ${theme.dim('List available groups:')} ${theme.command('nupst group list')}`);
        logger.log('');
        process.exit(1);
      }

      const target = ups || group;
      const targetType = ups ? 'UPS' : 'Group';
      const targetName = ups ? ups.name : group!.name;

      if (!target!.actions || target!.actions.length === 0) {
        logger.error(`No actions configured for ${targetType} '${targetName}'`);
        logger.log('');
        process.exit(1);
      }

      if (actionIndex >= target!.actions.length) {
        logger.error(
          `Invalid action index. ${targetType} '${targetName}' has ${target!.actions.length} action(s) (index 0-${target!.actions.length - 1})`,
        );
        logger.log('');
        logger.log(
          `  ${theme.dim('List actions:')} ${theme.command(`nupst action list ${targetId}`)}`,
        );
        logger.log('');
        process.exit(1);
      }

      const removedAction = target!.actions[actionIndex];
      target!.actions.splice(actionIndex, 1);

      await this.nupst.getDaemon().saveConfig(config);

      logger.log('');
      logger.success(`Action removed from ${targetType} ${targetName}`);
      logger.log(`  ${theme.dim('Type:')} ${removedAction.type}`);
      if (removedAction.thresholds) {
        logger.log(
          `  ${theme.dim('Thresholds:')} Battery: ${removedAction.thresholds.battery}%, Runtime: ${removedAction.thresholds.runtime}min`,
        );
      }
      logger.log(`  ${theme.dim('Changes saved and will be applied automatically')}`);
      logger.log('');
    } catch (error) {
      logger.error(
        `Failed to remove action: ${error instanceof Error ? error.message : String(error)}`,
      );
      process.exit(1);
    }
  }

  /**
   * List all actions for a specific UPS/group or all devices
   */
  public async list(targetId?: string): Promise<void> {
    try {
      const config = await this.nupst.getDaemon().loadConfig();

      if (targetId) {
        // List actions for specific UPS or group
        const ups = config.upsDevices.find((u) => u.id === targetId);
        const group = config.groups?.find((g) => g.id === targetId);

        if (!ups && !group) {
          logger.error(`UPS or Group with ID '${targetId}' not found`);
          logger.log('');
          logger.log(`  ${theme.dim('List available UPS devices:')} ${theme.command('nupst ups list')}`);
          logger.log(`  ${theme.dim('List available groups:')} ${theme.command('nupst group list')}`);
          logger.log('');
          process.exit(1);
        }

        if (ups) {
          this.displayTargetActions(ups, 'UPS');
        } else {
          this.displayTargetActions(group!, 'Group');
        }
      } else {
        // List actions for all UPS devices and groups
        logger.log('');
        logger.info('Actions for All UPS Devices and Groups');
        logger.log('');

        let hasAnyActions = false;

        // Display UPS actions
        for (const ups of config.upsDevices) {
          if (ups.actions && ups.actions.length > 0) {
            hasAnyActions = true;
            this.displayTargetActions(ups, 'UPS');
          }
        }

        // Display Group actions
        for (const group of config.groups || []) {
          if (group.actions && group.actions.length > 0) {
            hasAnyActions = true;
            this.displayTargetActions(group, 'Group');
          }
        }

        if (!hasAnyActions) {
          logger.log(`  ${theme.dim('No actions configured')}`);
          logger.log('');
          logger.log(
            `  ${theme.dim('Add an action:')} ${theme.command('nupst action add <ups-id|group-id>')}`,
          );
          logger.log('');
        }
      }
    } catch (error) {
      logger.error(
        `Failed to list actions: ${error instanceof Error ? error.message : String(error)}`,
      );
      process.exit(1);
    }
  }

  /**
   * Display actions for a single UPS or Group
   */
  private displayTargetActions(
    target: IUpsConfig | IGroupConfig,
    targetType: 'UPS' | 'Group',
  ): void {
    logger.log(
      `${symbols.info} ${targetType} ${theme.highlight(target.name)} ${theme.dim(`(${target.id})`)}`,
    );
    logger.log('');

    if (!target.actions || target.actions.length === 0) {
      logger.log(`  ${theme.dim('No actions configured')}`);
      logger.log('');
      return;
    }

    const columns: ITableColumn[] = [
      { header: 'Index', key: 'index', align: 'right' },
      { header: 'Type', key: 'type', align: 'left' },
      { header: 'Battery', key: 'battery', align: 'right' },
      { header: 'Runtime', key: 'runtime', align: 'right' },
      { header: 'Trigger Mode', key: 'triggerMode', align: 'left' },
      { header: 'Delay', key: 'delay', align: 'right' },
    ];

    const rows = target.actions.map((action, index) => ({
      index: theme.dim(index.toString()),
      type: theme.highlight(action.type),
      battery: action.thresholds ? `${action.thresholds.battery}%` : theme.dim('N/A'),
      runtime: action.thresholds ? `${action.thresholds.runtime}min` : theme.dim('N/A'),
      triggerMode: theme.dim(action.triggerMode || 'onlyThresholds'),
      delay: `${action.shutdownDelay || 5}s`,
    }));

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