import { type Video, type InsertVideo, type UpdateVideo } from "@shared/schema";
import { randomUUID } from "crypto";
import { BunnyService } from "./bunny";

export interface IStorage {
  getVideos(limit?: number, offset?: number, search?: string): Promise<Video[]>;
  getVideo(id: string): Promise<Video | undefined>;
  createVideo(video: InsertVideo): Promise<Video>;
  updateVideo(id: string, video: UpdateVideo): Promise<Video | undefined>;
  updateVideoViews(id: string): Promise<void>;
  getVideoCount(search?: string): Promise<number>;
}

export class MemStorage implements IStorage {
  private videos: Map<string, Video>;

  constructor() {
    this.videos = new Map();
    // Initialize with some sample videos for demonstration
    // In production, these would be fetched from bunny.net API
    this.initializeSampleVideos();
  }

  private initializeSampleVideos() {
    const sampleVideos: InsertVideo[] = [
      {
        title: "Advanced Web Development Techniques and Best Practices",
        description: "Learn modern web development techniques including React, TypeScript, and performance optimization strategies.",
        thumbnailUrl: "https://images.unsplash.com/photo-1560472355-536de3962603?ixlib=rb-4.0.3&auto=format&fit=crop&w=800&h=450",
        videoUrl: "https://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4",
        duration: 754, // 12:34
        views: 2100,
        category: "Tutorial"
      },
      {
        title: "Team Collaboration Strategies for Remote Work",
        description: "Effective strategies for managing remote teams and improving collaboration in distributed environments.",
        thumbnailUrl: "https://images.unsplash.com/photo-1552664730-d307ca884978?ixlib=rb-4.0.3&auto=format&fit=crop&w=800&h=450",
        videoUrl: "https://commondatastorage.googleapis.com/gtv-videos-bucket/sample/ElephantsDream.mp4",
        duration: 495, // 8:15
        views: 856,
        category: "Business"
      },
      {
        title: "Modern UI/UX Design Principles and Workflows",
        description: "Comprehensive guide to modern design principles, user experience optimization, and design system creation.",
        thumbnailUrl: "https://images.unsplash.com/photo-1581291518857-4e27b48ff24e?ixlib=rb-4.0.3&auto=format&fit=crop&w=800&h=450",
        videoUrl: "https://commondatastorage.googleapis.com/gtv-videos-bucket/sample/ForBiggerBlazes.mp4",
        duration: 942, // 15:42
        views: 3700,
        category: "Design"
      },
      {
        title: "Data Analytics and Business Intelligence Tutorial",
        description: "Learn how to analyze data effectively using modern tools and create meaningful business insights.",
        thumbnailUrl: "https://images.unsplash.com/photo-1551288049-bebda4e38f71?ixlib=rb-4.0.3&auto=format&fit=crop&w=800&h=450",
        videoUrl: "https://commondatastorage.googleapis.com/gtv-videos-bucket/sample/ForBiggerEscapes.mp4",
        duration: 1328, // 22:08
        views: 1400,
        category: "Analytics"
      },
      {
        title: "Mobile App Development: From Concept to Launch",
        description: "Complete guide to mobile app development covering design, development, testing, and deployment strategies.",
        thumbnailUrl: "https://images.unsplash.com/photo-1512941937669-90a1b58e7e9c?ixlib=rb-4.0.3&auto=format&fit=crop&w=800&h=450",
        videoUrl: "https://commondatastorage.googleapis.com/gtv-videos-bucket/sample/ForBiggerFun.mp4",
        duration: 1113, // 18:33
        views: 4200,
        category: "Mobile"
      },
      {
        title: "Cloud Infrastructure and DevOps Fundamentals",
        description: "Understanding cloud computing, infrastructure as code, and DevOps practices for modern applications.",
        thumbnailUrl: "https://images.unsplash.com/photo-1558494949-ef010cbdcc31?ixlib=rb-4.0.3&auto=format&fit=crop&w=800&h=450",
        videoUrl: "https://commondatastorage.googleapis.com/gtv-videos-bucket/sample/ForBiggerJoyrides.mp4",
        duration: 1517, // 25:17
        views: 987,
        category: "DevOps"
      }
    ];

    sampleVideos.forEach(video => {
      const id = randomUUID();
      const fullVideo: Video = {
        ...video,
        id,
        description: video.description || "",
        category: video.category || "",
        customThumbnailUrl: null,
        videoUrlMp4: null,
        videoUrlIframe: null,
        tags: [],
        isPublic: true,
        createdAt: new Date(),
        updatedAt: new Date()
      };
      this.videos.set(id, fullVideo);
    });
  }

  async getVideos(limit = 20, offset = 0, search?: string): Promise<Video[]> {
    let videos = Array.from(this.videos.values());

    // Filter by search
    if (search) {
      const searchLower = search.toLowerCase();
      videos = videos.filter(video => 
        video.title.toLowerCase().includes(searchLower) ||
        video.description?.toLowerCase().includes(searchLower)
      );
    }

    // Sort by created date (newest first)
    videos.sort((a, b) => b.createdAt.getTime() - a.createdAt.getTime());

    return videos.slice(offset, offset + limit);
  }

  async getVideo(id: string): Promise<Video | undefined> {
    return this.videos.get(id);
  }

  async createVideo(video: InsertVideo): Promise<Video> {
    const id = randomUUID();
    const fullVideo: Video = {
      ...video,
      id,
      description: video.description || "",
      category: video.category || "",
      customThumbnailUrl: null,
      videoUrlMp4: null,
      videoUrlIframe: null,
      tags: video.tags || [],
      isPublic: video.isPublic ?? true,
      createdAt: new Date(),
      updatedAt: new Date()
    };
    this.videos.set(id, fullVideo);
    return fullVideo;
  }

  async updateVideo(id: string, updates: UpdateVideo): Promise<Video | undefined> {
    const video = this.videos.get(id);
    if (!video) return undefined;

    const updatedVideo: Video = {
      ...video,
      ...updates,
      updatedAt: new Date()
    };
    this.videos.set(id, updatedVideo);
    return updatedVideo;
  }

  async updateVideoViews(id: string): Promise<void> {
    const video = this.videos.get(id);
    if (video) {
      video.views += 1;
      this.videos.set(id, video);
    }
  }

  async getVideoCount(search?: string): Promise<number> {
    const videos = await this.getVideos(1000, 0, search);
    return videos.length;
  }
}

// Use Bunny.net storage if API keys are available, otherwise fallback to memory storage
class BunnyStorage implements IStorage {
  private bunnyService: BunnyService;
  private viewsCache: Map<string, number> = new Map();

  constructor() {
    this.bunnyService = new BunnyService();
  }

  async getVideos(limit = 20, offset = 0, search?: string): Promise<Video[]> {
    try {
      // For search filtering, we need to get more videos than the requested limit
      // because we'll filter client-side and then slice to the requested amount
      const fetchLimit = search ? 100 : limit;
      const page = Math.floor(offset / fetchLimit) + 1;
      
      // Get videos from Bunny API
      const { videos } = await this.bunnyService.getVideos(page, fetchLimit);
      
      // Apply client-side filtering
      let filteredVideos = videos;
      
      // Filter by search
      if (search) {
        const searchLower = search.toLowerCase();
        filteredVideos = filteredVideos.filter(video => 
          video.title.toLowerCase().includes(searchLower) ||
          (video.description && video.description.toLowerCase().includes(searchLower))
        );
      }

      // Apply cached view counts
      filteredVideos.forEach(video => {
        if (this.viewsCache.has(video.id)) {
          video.views += this.viewsCache.get(video.id)!;
        }
      });

      // Apply pagination after filtering
      return filteredVideos.slice(offset, offset + limit);
    } catch (error) {
      console.error('Error fetching videos from Bunny:', error);
      // Fallback to empty array on error
      return [];
    }
  }

  async getVideo(id: string): Promise<Video | undefined> {
    try {
      const video = await this.bunnyService.getVideo(id);
      if (!video) return undefined;

      // Apply cached view counts
      if (this.viewsCache.has(video.id)) {
        video.views += this.viewsCache.get(video.id)!;
      }

      return video;
    } catch (error) {
      console.error(`Error fetching video ${id} from Bunny:`, error);
      return undefined;
    }
  }

  async createVideo(video: InsertVideo): Promise<Video> {
    // Note: Creating videos would require uploading to Bunny.net
    // For now, we'll throw an error as this operation is not supported
    throw new Error("Creating videos is not supported with Bunny.net integration");
  }

  async updateVideo(id: string, updates: UpdateVideo): Promise<Video | undefined> {
    // Note: Updating video metadata in Bunny.net would require API calls
    // For now, we'll throw an error as this operation is not supported
    throw new Error("Updating videos is not supported with Bunny.net integration");
  }

  async updateVideoViews(id: string): Promise<void> {
    // Since we can't update views in Bunny.net directly, we'll cache them locally
    const currentViews = this.viewsCache.get(id) || 0;
    this.viewsCache.set(id, currentViews + 1);
  }

  async getVideoCount(search?: string): Promise<number> {
    try {
      // For accurate count with client-side filtering, we need to get all videos and filter them
      const allVideos = await this.getVideos(1000, 0, search);
      return allVideos.length;
    } catch (error) {
      console.error('Error getting video count from Bunny:', error);
      return 0;
    }
  }
}

// Try to use Bunny.net storage, fallback to memory storage if not configured
let storage: IStorage;

// Check if Bunny.net environment variables are available
const hasBunnyConfig = process.env.BUNNY_API_KEY && process.env.BUNNY_LIBRARY_ID && process.env.BUNNY_HOSTNAME;

if (hasBunnyConfig) {
  try {
    storage = new BunnyStorage();
    console.log('✅ Using Bunny.net storage with library ID:', process.env.BUNNY_LIBRARY_ID);
  } catch (error) {
    console.error('❌ Failed to initialize Bunny.net storage:', error);
    console.log('📁 Falling back to memory storage');
    storage = new MemStorage();
  }
} else {
  console.log('📁 Bunny.net environment variables not found, using memory storage');
  storage = new MemStorage();
}

export { storage };