<?php

/**
 * MemeMediaSeeder - Clean Laravel Seeder
 *
 * Usage: php artisan db:seed --class=MemeMediaSeeder
 *
 * Setup:
 * 1. Place webm_metadata.csv in: database/seeders/data/webm_metadata.csv
 * 2. Run: php artisan db:seed --class=MemeMediaSeeder
 *
 * What it does:
 * - Reads 223 meme records from CSV
 * - Creates 4 MediaEngine entries per meme (webm, mov, webp, gif)
 * - Creates MemeMedia records with all UUIDs and URLs
 * - Uses save_url mode for fast CDN references
 */

namespace Database\Seeders;

use App\Helpers\FirstParty\MediaEngine\MediaEngine;
use App\Models\MediaCollection;
use App\Models\MemeMedia;
use Illuminate\Database\Seeder;
use Illuminate\Support\Facades\DB;

class MemeMediaSeeder extends Seeder
{
    private const CDN_BASE_URL = 'https://cdn.memeaigen.com/g1';

    private const FORMATS = [
        'webm' => ['ext' => 'webm', 'mime' => 'video/webm'],
        'mov' => ['ext' => 'mov', 'mime' => 'video/quicktime'],
        'webp' => ['ext' => 'webp', 'mime' => 'image/webp'],
        'gif' => ['ext' => 'gif', 'mime' => 'image/gif'],
    ];

    /**
     * Run the database seeds.
     */
    public function run(): void
    {
        $this->command->info('🚀 Starting meme media import...');

        // Ensure media collection exists
        $this->ensureMediaCollectionExists();

        // Read CSV file
        $csvPath = database_path('seeders/data/webm_metadata.csv');
        $memeData = $this->parseCsvFile($csvPath);

        $this->command->info('📊 Found '.count($memeData).' memes to import');

        // Process in chunks for memory efficiency
        $chunks = array_chunk($memeData, 50);
        $totalProcessed = 0;
        $totalSkipped = 0;
        $totalFailed = 0;

        foreach ($chunks as $chunkIndex => $chunk) {
            $this->command->info('Processing chunk '.($chunkIndex + 1).'/'.count($chunks));

            DB::transaction(function () use ($chunk, &$totalProcessed, &$totalSkipped, &$totalFailed) {
                foreach ($chunk as $memeRecord) {
                    try {
                        // Extract base filename for duplicate checking
                        $baseFilename = pathinfo($memeRecord['filename'], PATHINFO_FILENAME);

                        // Check if already exists by checking if webm_url contains this filename
                        if (MemeMedia::where('webm_url', 'like', "%/{$baseFilename}.webm")->exists()) {
                            $this->command->warn("⏭️  Skipping existing: {$memeRecord['filename']} ({$memeRecord['name']})");
                            $totalSkipped++;

                            continue;
                        }

                        $this->importSingleMeme($memeRecord);
                        $totalProcessed++;

                        if ($totalProcessed % 10 === 0) {
                            $this->command->info("✅ Processed {$totalProcessed} memes...");
                        }
                    } catch (\Exception $e) {
                        $totalFailed++;
                        $this->command->error("❌ Failed to import: {$memeRecord['filename']} - {$e->getMessage()}");
                    }
                }
            });
        }

        // Summary
        $this->command->info("\n🎯 Import Summary:");
        $this->command->info("✅ Successfully imported: {$totalProcessed} memes");
        if ($totalSkipped > 0) {
            $this->command->info("⏭️  Skipped (existing): {$totalSkipped} memes");
        }
        if ($totalFailed > 0) {
            $this->command->error("❌ Failed: {$totalFailed} memes");
        }

        $totalMediaRecords = $totalProcessed * 4;
        $this->command->info("📊 Created {$totalMediaRecords} media records and {$totalProcessed} meme_media records");
    }

    /**
     * Parse CSV file and return array of meme data
     */
    private function parseCsvFile(string $csvPath): array
    {
        if (! file_exists($csvPath)) {
            throw new \RuntimeException("CSV file not found: {$csvPath}");
        }

        $csvContent = file_get_contents($csvPath);
        $lines = str_getcsv($csvContent, "\n");

        // Parse header row
        $headers = str_getcsv(array_shift($lines));

        $memeData = [];
        foreach ($lines as $line) {
            if (empty(trim($line))) {
                continue;
            }

            $row = str_getcsv($line);
            if (count($row) === count($headers)) {
                $memeData[] = array_combine($headers, $row);
            }
        }

        return $memeData;
    }

    /**
     * Import a single meme with all its formats
     */
    private function importSingleMeme(array $memeRecord): void
    {
        // Extract base filename (remove .webm extension)
        $baseFilename = pathinfo($memeRecord['filename'], PATHINFO_FILENAME);

        $mediaUuids = [];
        $mediaUrls = [];

        // Create MediaEngine entries for each format
        foreach (self::FORMATS as $format => $config) {
            $url = $this->generateCdnUrl($baseFilename, $config['ext']);

            // Create media entry using save_url mode
            $media = MediaEngine::addMedia(
                'temps', // Media collection key
                $memeRecord['type'], // video or image
                'system_uploaded', // Media source
                'meme_cdn', // Media provider
                null, // No file content
                $url, // CDN URL
                'save_url', // Mode: just save URL reference
                null, // Auto-generate filename
                'r2', // Disk (not used for URL mode)
                trim($memeRecord['name'])." ({$format})", // Name with format
                null, // No specific user
                $config['mime'] // MIME type
            );

            $mediaUuids[$format.'_uuid'] = $media->uuid;
            $mediaUrls[$format.'_url'] = $url;
        }

        // Create MemeMedia record
        MemeMedia::create([
            'type' => $memeRecord['type'],
            'sub_type' => $memeRecord['sub_type'],
            'name' => trim($memeRecord['name']),
            'description' => $memeRecord['description'],
            'keywords' => $memeRecord['keywords'],

            // UUIDs from MediaEngine
            'mov_uuid' => $mediaUuids['mov_uuid'],
            'webm_uuid' => $mediaUuids['webm_uuid'],
            'gif_uuid' => $mediaUuids['gif_uuid'],
            'webp_uuid' => $mediaUuids['webp_uuid'],

            // Direct CDN URLs
            'mov_url' => $mediaUrls['mov_url'],
            'webm_url' => $mediaUrls['webm_url'],
            'gif_url' => $mediaUrls['gif_url'],
            'webp_url' => $mediaUrls['webp_url'],

            // Embedding will be null initially
            'embedding' => null,
        ]);

        $this->command->info('✅ Imported: '.trim($memeRecord['name']));
    }

    /**
     * Generate CDN URL for specific format
     */
    private function generateCdnUrl(string $baseFilename, string $extension): string
    {
        return self::CDN_BASE_URL."/{$extension}/{$baseFilename}.{$extension}";
    }

    /**
     * Ensure the temps media collection exists
     */
    private function ensureMediaCollectionExists(): void
    {
        $collection = MediaCollection::firstOrCreate([
            'key' => 'temps',
        ], [
            'name' => 'Temp Files',
            'description' => 'Temporary and external file references',
            'is_system' => true,
        ]);

        $this->command->info("📁 Using media collection: {$collection->key}");
    }
}