import * as plugins from './tswatch.plugins.js';
import * as paths from './tswatch.paths.js';
import * as interfaces from './interfaces/index.js';

const CONFIG_KEY = '@git.zone/tswatch';

/**
 * Preset configurations matching legacy watch modes
 */
const presets: Record<string, interfaces.ITswatchConfig> = {
  npm: {
    watchers: [
      {
        name: 'npm-test',
        watch: ['./ts/**/*', './test/**/*'],
        command: 'npm run test',
        restart: true,
        debounce: 300,
        runOnStart: true,
      },
    ],
  },
  test: {
    watchers: [
      {
        name: 'test2',
        watch: ['./ts/**/*', './test/**/*'],
        command: 'npm run test2',
        restart: true,
        debounce: 300,
        runOnStart: true,
      },
    ],
  },
  service: {
    watchers: [
      {
        name: 'service',
        watch: './ts/**/*',
        command: 'npm run startTs',
        restart: true,
        debounce: 300,
        runOnStart: true,
      },
    ],
  },
  element: {
    server: {
      enabled: true,
      port: 3002,
      serveDir: './dist_watch/',
      liveReload: true,
    },
    bundles: [
      {
        name: 'element-bundle',
        from: './html/index.ts',
        to: './dist_watch/bundle.js',
        watchPatterns: ['./ts_web/**/*'],
        triggerReload: true,
      },
      {
        name: 'html',
        from: './html/index.html',
        to: './dist_watch/index.html',
        watchPatterns: ['./html/**/*'],
        triggerReload: true,
      },
    ],
    watchers: [
      {
        name: 'ts-build',
        watch: './ts/**/*',
        command: 'npm run build',
        restart: false,
        debounce: 300,
        runOnStart: false,
      },
    ],
  },
  website: {
    bundles: [
      {
        name: 'website-bundle',
        from: './ts_web/index.ts',
        to: './dist_serve/bundle.js',
        watchPatterns: ['./ts_web/**/*'],
        triggerReload: false,
      },
      {
        name: 'html',
        from: './html/index.html',
        to: './dist_serve/index.html',
        watchPatterns: ['./html/**/*'],
        triggerReload: false,
      },
      {
        name: 'assets',
        from: './assets/',
        to: './dist_serve/assets/',
        watchPatterns: ['./assets/**/*'],
        triggerReload: false,
      },
    ],
    watchers: [
      {
        name: 'backend',
        watch: './ts/**/*',
        command: 'npm run startTs',
        restart: true,
        debounce: 300,
        runOnStart: true,
      },
    ],
  },
};

/**
 * Handles loading and managing tswatch configuration
 */
export class ConfigHandler {
  private npmextra: plugins.npmextra.Npmextra;
  private cwd: string;

  constructor(cwdArg?: string) {
    this.cwd = cwdArg || paths.cwd;
    this.npmextra = new plugins.npmextra.Npmextra(this.cwd);
  }

  /**
   * Check if a tswatch configuration exists
   */
  public hasConfig(): boolean {
    const config = this.npmextra.dataFor<interfaces.ITswatchConfig>(CONFIG_KEY, null);
    return config !== null;
  }

  /**
   * Load configuration from npmextra.json
   * If a preset is specified, merge preset defaults with user overrides
   */
  public loadConfig(): interfaces.ITswatchConfig | null {
    const config = this.npmextra.dataFor<interfaces.ITswatchConfig>(CONFIG_KEY, null);

    if (!config) {
      return null;
    }

    // If a preset is specified, merge it with user config
    if (config.preset && presets[config.preset]) {
      const preset = presets[config.preset];
      return {
        ...preset,
        ...config,
        // Merge arrays instead of replacing
        watchers: config.watchers || preset.watchers,
        bundles: config.bundles || preset.bundles,
        server: config.server !== undefined ? config.server : preset.server,
      };
    }

    return config;
  }

  /**
   * Get a preset configuration by name
   */
  public getPreset(presetName: string): interfaces.ITswatchConfig | null {
    return presets[presetName] || null;
  }

  /**
   * Get all available preset names
   */
  public getPresetNames(): string[] {
    return Object.keys(presets);
  }

  /**
   * Get the config key for npmextra.json
   */
  public getConfigKey(): string {
    return CONFIG_KEY;
  }
}