import { db } from "./db";
import { sql } from "drizzle-orm";
import { videoSyncService } from "./videoSync";

export class VideoMigrator {
  private isRunning = false;
  private syncInterval: NodeJS.Timeout | null = null;

  async initialize(): Promise<void> {
    console.log("🔄 Initializing video metadata migrator...");
    
    // Run initial migration
    await this.migrateAllVideoMetadata();
    
    // Set up periodic sync every 5 minutes to ensure database is always complete
    this.syncInterval = setInterval(async () => {
      console.log("⏰ Starting periodic video metadata sync...");
      try {
        await this.migrateAllVideoMetadata();
        const count = await this.getVideoCount();
        console.log(`✅ Periodic sync completed - Database: ${count.database}, Bunny: ${count.bunny}`);
      } catch (error) {
        console.error("❌ Periodic sync failed:", error);
      }
    }, 5 * 60 * 1000); // Every 5 minutes
    
    console.log("✅ Video metadata migrator initialized with periodic sync");
  }

  async migrateAllVideoMetadata(): Promise<void> {
    if (this.isRunning) {
      console.log("🔄 Migration already running...");
      return;
    }

    this.isRunning = true;
    console.log("🔄 Migrating all video metadata from Bunny.net to PostgreSQL...");

    try {
      // Get all videos from cache
      const videoList = videoSyncService.getVideos(1000, 0).videos;
      console.log(`📥 Found ${videoList.length} videos in cache`);

      let inserted = 0;
      let updated = 0;

      for (const video of videoList) {
        try {
          // Upsert video metadata with simple SQL
          await db.execute(sql`
            INSERT INTO video_metadata (
              id, title, description, thumbnail_url, video_url, 
              duration, views, category, created_at, updated_at
            ) VALUES (
              ${video.id}, ${video.title}, ${video.description || ""}, 
              ${video.thumbnailUrl}, ${video.videoUrl}, 
              ${video.duration}, ${video.views}, ${video.category || ""}, 
              ${video.createdAt ? new Date(video.createdAt) : new Date()}, 
              ${new Date()}
            ) ON CONFLICT (id) DO UPDATE SET
              title = EXCLUDED.title,
              description = EXCLUDED.description,
              thumbnail_url = EXCLUDED.thumbnail_url,
              video_url = EXCLUDED.video_url,
              duration = EXCLUDED.duration,
              views = EXCLUDED.views,
              category = EXCLUDED.category,
              updated_at = EXCLUDED.updated_at
          `);
          
          inserted++;

          // Log progress every 10 videos
          if ((inserted + updated) % 10 === 0) {
            console.log(`📊 Progress: ${inserted + updated}/${videoList.length} videos processed`);
          }

        } catch (error) {
          console.error(`❌ Error processing ${video.title}:`, error);
        }
      }

      const dbCount = await this.getVideoCount();
      
      console.log(`✅ Migration completed:`);
      console.log(`   📥 Inserted: ${inserted} new videos`);
      console.log(`   🔄 Updated: ${updated} existing videos`);
      console.log(`   📊 Database total: ${dbCount.database} videos`);
      console.log(`   🎥 Bunny.net total: ${dbCount.bunny} videos`);
      
      // Verify all Bunny videos are in database
      if (dbCount.database < dbCount.bunny) {
        console.warn(`⚠️  Warning: Database has ${dbCount.database} videos but Bunny.net has ${dbCount.bunny}. Some videos may be missing!`);
      } else {
        console.log("✅ All Bunny.net videos are synchronized with database");
      }

    } catch (error) {
      console.error("❌ Migration failed:", error);
    } finally {
      this.isRunning = false;
    }
  }

  async getVideoCount(): Promise<{ database: number; bunny: number }> {
    try {
      const dbResult = await db.execute(sql`SELECT COUNT(*) FROM video_metadata`);
      const cachedVideos = videoSyncService.getVideos(1000, 0).videos;

      return {
        database: Number(dbResult.rows[0]?.count || 0),
        bunny: cachedVideos.length
      };
    } catch (error) {
      console.error("❌ Error counting videos:", error);
      return { database: 0, bunny: 0 };
    }
  }
}

export const videoMigrator = new VideoMigrator();