import * as plugins from './moxytool.plugins.ts';
import * as paths from './moxytool.paths.ts';
import { logger } from './moxytool.logging.ts';

/**
 * Interface for script metadata from JSON files
 */
export interface IScriptMetadata {
  name: string;
  slug: string;
  type: string;
  categories: number[];
  description: string;
  install_methods: Array<{
    type: string;
    script: string;
    resources: {
      cpu?: number;
      ram?: number;
      hdd?: number;
      os?: string;
      version?: string;
    };
  }>;
  interface_port?: number;
  config_path?: string;
  documentation?: string;
  website?: string;
  logo?: string;
  default_credentials?: {
    username?: string;
    password?: string;
  };
  notes?: Array<{
    type: string;
    content: string;
  }>;
  updateable?: boolean;
  privileged?: boolean;
  date_created?: string;
}

/**
 * Interface for the cached index
 */
export interface IScriptIndexCache {
  lastUpdated: number;
  scripts: IScriptMetadata[];
}

/**
 * ScriptIndex class manages the Proxmox community scripts index
 * - Fetches JSON metadata from Gitea
 * - Caches locally with 24-hour TTL
 * - Provides search and filtering capabilities
 */
export class ScriptIndex {
  private static readonly BASE_URL =
    'https://code.foss.global/asset_backups/ProxmoxVE/raw/branch/main/frontend/public/json';
  private static readonly INDEX_LIST_URL =
    'https://code.foss.global/asset_backups/ProxmoxVE/src/branch/main/frontend/public/json';
  private static readonly CACHE_TTL = 24 * 60 * 60 * 1000; // 24 hours in ms

  private cache: IScriptIndexCache | null = null;

  /**
   * Check if the index needs to be refreshed (>24 hours old)
   */
  public async needsRefresh(): Promise<boolean> {
    try {
      // Try to load from cache
      await this.loadCache();

      if (!this.cache) {
        return true; // No cache, need refresh
      }

      const age = Date.now() - this.cache.lastUpdated;
      return age > ScriptIndex.CACHE_TTL;
    } catch (error) {
      logger.log('warn', `Error checking cache age: ${error}`);
      return true; // On error, refresh
    }
  }

  /**
   * Load the index from local cache
   */
  public async loadCache(): Promise<void> {
    try {
      if (!Deno) {
        throw new Error('Deno runtime not available');
      }

      const cacheFile = paths.scriptsIndexFile;

      // Check if cache file exists
      try {
        await Deno.stat(cacheFile);
      } catch {
        // File doesn't exist
        this.cache = null;
        return;
      }

      // Read and parse cache
      const content = await Deno.readTextFile(cacheFile);
      this.cache = JSON.parse(content) as IScriptIndexCache;

      logger.log('info', `Loaded ${this.cache.scripts.length} scripts from cache`);
    } catch (error) {
      logger.log('warn', `Error loading cache: ${error}`);
      this.cache = null;
    }
  }

  /**
   * Fetch the index from Gitea and update cache
   */
  public async fetchIndex(): Promise<void> {
    try {
      logger.log('info', 'Fetching script index from Gitea...');

      // First, get the list of all JSON files
      const fileList = await this.fetchFileList();

      if (fileList.length === 0) {
        throw new Error('No JSON files found in repository');
      }

      logger.log('info', `Found ${fileList.length} script definitions`);

      // Fetch all JSON files
      const scripts: IScriptMetadata[] = [];
      let successCount = 0;
      let errorCount = 0;

      for (const filename of fileList) {
        try {
          const script = await this.fetchScript(filename);
          if (script) {
            scripts.push(script);
            successCount++;
          }
        } catch (error) {
          errorCount++;
          logger.log('warn', `Failed to fetch ${filename}: ${error}`);
        }
      }

      logger.log('info', `Successfully fetched ${successCount} scripts (${errorCount} errors)`);

      // Update cache
      this.cache = {
        lastUpdated: Date.now(),
        scripts,
      };

      // Save to disk
      await this.saveCache();

      logger.log('success', `Index refreshed: ${scripts.length} scripts cached`);
    } catch (error) {
      logger.log('error', `Failed to fetch index: ${error}`);
      throw error;
    }
  }

  /**
   * Fetch the list of JSON files from the repository
   */
  private async fetchFileList(): Promise<string[]> {
    try {
      // Simple approach: fetch a known comprehensive list
      // In production, you'd parse the directory listing or use the API
      // For now, we'll use a hardcoded list of common scripts
      // TODO: Implement proper directory listing scraping or use Gitea API

      // Fetch the directory listing page
      const response = await fetch(ScriptIndex.INDEX_LIST_URL);
      if (!response.ok) {
        throw new Error(`HTTP ${response.status}: ${response.statusText}`);
      }

      const html = await response.text();

      // Extract .json filenames from HTML
      const jsonFileRegex = /href="[^"]*\/([^"\/]+\.json)"/g;
      const matches = [...html.matchAll(jsonFileRegex)];
      const files = matches.map((match) => match[1]).filter((file) => file.endsWith('.json'));

      // Remove duplicates
      return [...new Set(files)];
    } catch (error) {
      logger.log('error', `Failed to fetch file list: ${error}`);
      throw error;
    }
  }

  /**
   * Fetch a single script JSON file
   */
  private async fetchScript(filename: string): Promise<IScriptMetadata | null> {
    try {
      const url = `${ScriptIndex.BASE_URL}/${filename}`;
      const response = await fetch(url);

      if (!response.ok) {
        throw new Error(`HTTP ${response.status}`);
      }

      const data = await response.json();
      return data as IScriptMetadata;
    } catch (error) {
      logger.log('warn', `Failed to fetch ${filename}: ${error}`);
      return null;
    }
  }

  /**
   * Save the cache to disk
   */
  private async saveCache(): Promise<void> {
    try {
      if (!this.cache) {
        return;
      }

      // Ensure cache directory exists
      await Deno.mkdir(paths.scriptsCacheDir, { recursive: true });

      // Write cache file
      const content = JSON.stringify(this.cache, null, 2);
      await Deno.writeTextFile(paths.scriptsIndexFile, content);

      logger.log('info', 'Cache saved successfully');
    } catch (error) {
      logger.log('error', `Failed to save cache: ${error}`);
      throw error;
    }
  }

  /**
   * Get all scripts from cache
   */
  public getAll(): IScriptMetadata[] {
    if (!this.cache) {
      return [];
    }
    return this.cache.scripts;
  }

  /**
   * Search scripts by query string
   */
  public search(query: string): IScriptMetadata[] {
    if (!this.cache) {
      return [];
    }

    const lowerQuery = query.toLowerCase();

    return this.cache.scripts.filter((script) => {
      // Search in name, description, and slug
      return (
        script.name.toLowerCase().includes(lowerQuery) ||
        script.slug.toLowerCase().includes(lowerQuery) ||
        script.description.toLowerCase().includes(lowerQuery)
      );
    });
  }

  /**
   * Get a script by slug
   */
  public getBySlug(slug: string): IScriptMetadata | null {
    if (!this.cache) {
      return null;
    }

    return this.cache.scripts.find((script) => script.slug === slug) || null;
  }

  /**
   * Filter scripts by type (ct/vm)
   */
  public filterByType(type: string): IScriptMetadata[] {
    if (!this.cache) {
      return [];
    }

    return this.cache.scripts.filter((script) => script.type === type);
  }

  /**
   * Get cache statistics
   */
  public getStats(): { count: number; lastUpdated: Date | null; age: string } {
    if (!this.cache) {
      return { count: 0, lastUpdated: null, age: 'never' };
    }

    const now = Date.now();
    const age = now - this.cache.lastUpdated;
    const hours = Math.floor(age / (60 * 60 * 1000));
    const minutes = Math.floor((age % (60 * 60 * 1000)) / (60 * 1000));

    return {
      count: this.cache.scripts.length,
      lastUpdated: new Date(this.cache.lastUpdated),
      age: hours > 0 ? `${hours}h ${minutes}m ago` : `${minutes}m ago`,
    };
  }
}