import { type Video, type InsertVideo } from "@shared/schema";
import crypto from 'crypto';

interface BunnyVideo {
  guid: string;
  title: string;
  length: number;
  status: number;
  dateUploaded: string;
  views: number;
  thumbnailFileName?: string;
  category?: string;
}

interface BunnyLibraryResponse {
  items: BunnyVideo[];
  currentPage: number;
  itemsPerPage: number;
  totalItems: number;
}

export class BunnyService {
  private apiKey: string;
  private libraryId: string;
  private hostname: string;
  private securityKey: string;

  constructor() {
    this.apiKey = process.env.BUNNY_API_KEY!;
    this.libraryId = process.env.BUNNY_LIBRARY_ID!;
    this.hostname = process.env.BUNNY_HOSTNAME!;
    this.securityKey = process.env.BUNNY_SECURITY_KEY || ''; // CDN security key for signing URLs

    if (!this.apiKey || !this.libraryId || !this.hostname) {
      throw new Error("Missing Bunny.net configuration");
    }
  }

  private async makeRequest(endpoint: string): Promise<any> {
    const url = `https://video.bunnycdn.com/library/${this.libraryId}/${endpoint}`;
    
    const response = await fetch(url, {
      headers: {
        'AccessKey': this.apiKey,
        'Accept': 'application/json',
        'Content-Type': 'application/json'
      }
    });

    if (!response.ok) {
      throw new Error(`Bunny API error: ${response.status} ${response.statusText}`);
    }

    return response.json();
  }

  private generateSignedUrl(path: string, expiryHours: number = 1): string {
    if (!this.securityKey) {
      // If no security key, return iframe embed as fallback
      const videoId = path.split('/')[1];
      return `https://iframe.mediadelivery.net/embed/${this.libraryId}/${videoId}?controls=true&autoplay=false`;
    }

    const expireTimestamp = Math.floor(Date.now() / 1000) + (expiryHours * 3600);
    const tokenContent = `${this.securityKey}${path}${expireTimestamp}`;
    
    const hash = crypto.createHash('md5').update(tokenContent).digest();
    const token = Buffer.from(hash).toString('base64')
      .replace(/\+/g, '-')
      .replace(/\//g, '_')
      .replace(/=/g, '');

    return `https://${this.hostname}${path}?token=${token}&expires=${expireTimestamp}`;
  }

  // Public method for generating signed URLs for sharing
  generatePublicSignedUrl(path: string, expiryHours: number = 1): string {
    return this.generateSignedUrl(path, expiryHours);
  }

  private bunnyVideoToVideo(bunnyVideo: BunnyVideo): Video {
    // Generate signed URLs for private video access
    const videoPath = `/${bunnyVideo.guid}/playlist.m3u8`;
    const thumbnailPath = `/${bunnyVideo.guid}/${bunnyVideo.thumbnailFileName || 'thumbnail.jpg'}`;
    
    const videoUrl = this.generateSignedUrl(videoPath);
    const thumbnailUrl = this.generateSignedUrl(thumbnailPath);

    return {
      id: bunnyVideo.guid,
      title: bunnyVideo.title || 'Untitled Video',
      description: null, // Bunny API doesn't return description in list view
      thumbnailUrl,
      videoUrl,
      duration: Math.floor(bunnyVideo.length || 0),
      views: bunnyVideo.views || 0,
      category: bunnyVideo.category || null,
      createdAt: new Date(bunnyVideo.dateUploaded)
    };
  }

  async getVideos(page: number = 1, itemsPerPage: number = 20, search?: string): Promise<{ videos: Video[], total: number }> {
    try {
      let endpoint = `videos?page=${page}&itemsPerPage=${itemsPerPage}&orderBy=date`;
      
      if (search) {
        endpoint += `&search=${encodeURIComponent(search)}`;
      }

      const response: BunnyLibraryResponse = await this.makeRequest(endpoint);
      
      // Filter only successfully processed videos (status 4 = finished)
      const processedVideos = response.items.filter(video => video.status === 4);
      
      const videos = processedVideos.map(video => this.bunnyVideoToVideo(video));
      
      return {
        videos,
        total: response.totalItems
      };
    } catch (error) {
      console.error('Error fetching videos from Bunny:', error);
      throw error;
    }
  }

  async getVideo(guid: string): Promise<Video | null> {
    try {
      const bunnyVideo: BunnyVideo = await this.makeRequest(`videos/${guid}`);
      return this.bunnyVideoToVideo(bunnyVideo);
    } catch (error) {
      console.error(`Error fetching video ${guid} from Bunny:`, error);
      return null;
    }
  }

  async getCategories(): Promise<string[]> {
    try {
      // Get all videos and extract unique categories
      const { videos } = await this.getVideos(1, 1000);
      const categories = Array.from(new Set(videos.map(v => v.category).filter(Boolean) as string[]));
      return categories;
    } catch (error) {
      console.error('Error fetching categories from Bunny:', error);
      return [];
    }
  }
}