<?php

declare(strict_types=1);

/**
 * Script to populate the database with images found in the filesystem
 *
 * This script scans storage/uploads/ for image files and creates database records
 * to match the existing files on disk.
 */

require_once 'vendor/autoload.php';

use App\Framework\DateTime\SystemClock;
use App\Framework\Id\Ulid\UlidGenerator;

class ImageMigrationScript
{
    private PDO $db;
    private SystemClock $clock;
    private string $uploadsPath;

    public function __construct()
    {
        $this->clock = new SystemClock();
        $this->uploadsPath = __DIR__ . '/storage/uploads';

        // Initialize database
        $this->initializeDatabase();
    }

    private function initializeDatabase(): void
    {
        // Simple SQLite connection for this script
        $pdo = new PDO('sqlite:' . __DIR__ . '/database.sqlite');
        $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        $this->db = $pdo;
    }

    public function run(): void
    {
        echo "🔍 Scanning for images in: {$this->uploadsPath}\n";

        if (!is_dir($this->uploadsPath)) {
            echo "❌ Uploads directory not found: {$this->uploadsPath}\n";
            return;
        }

        $imageFiles = $this->findImageFiles();
        echo "📁 Found " . count($imageFiles) . " image files\n";

        if (empty($imageFiles)) {
            echo "ℹ️ No images to migrate\n";
            return;
        }

        $this->migrateImages($imageFiles);
        echo "✅ Migration completed!\n";
    }

    private function findImageFiles(): array
    {
        $iterator = new RecursiveIteratorIterator(
            new RecursiveDirectoryIterator($this->uploadsPath)
        );

        $imageFiles = [];
        $allowedExtensions = ['jpg', 'jpeg', 'png', 'gif', 'webp'];

        foreach ($iterator as $file) {
            if (!$file->isFile()) {
                continue;
            }

            $extension = strtolower($file->getExtension());
            if (!in_array($extension, $allowedExtensions)) {
                continue;
            }

            $imageFiles[] = [
                'path' => $file->getPathname(),
                'filename' => $file->getFilename(),
                'extension' => $extension,
                'size' => $file->getSize(),
                'mtime' => $file->getMTime()
            ];
        }

        return $imageFiles;
    }

    private function migrateImages(array $imageFiles): void
    {
        // Check current database schema
        $this->checkDatabaseSchema();

        $migrated = 0;
        $errors = 0;

        foreach ($imageFiles as $fileInfo) {
            try {
                $this->migrateImageFile($fileInfo);
                $migrated++;
                echo "✓ Migrated: {$fileInfo['filename']}\n";
            } catch (Exception $e) {
                $errors++;
                echo "❌ Error migrating {$fileInfo['filename']}: " . $e->getMessage() . "\n";
            }
        }

        echo "\n📊 Summary:\n";
        echo "   Migrated: $migrated\n";
        echo "   Errors: $errors\n";
    }

    private function checkDatabaseSchema(): void
    {
        // Check what columns exist in the images table
        $stmt = $this->db->query("PRAGMA table_info(images)");
        $columns = $stmt->fetchAll(PDO::FETCH_ASSOC);

        echo "📋 Database schema (images table):\n";
        foreach ($columns as $column) {
            echo "   - {$column['name']} ({$column['type']})\n";
        }
        echo "\n";
    }

    private function migrateImageFile(array $fileInfo): void
    {
        $fullPath = $fileInfo['path'];

        // Extract image dimensions if possible
        $imageInfo = @getimagesize($fullPath);
        $width = $imageInfo[0] ?? 0;
        $height = $imageInfo[1] ?? 0;

        // Generate ULID
        $ulidGenerator = new UlidGenerator();
        $ulidString = $ulidGenerator->generate($this->clock);

        // Calculate hash
        $hashValue = hash_file('sha256', $fullPath);

        // Determine MIME type
        $mimeTypeString = match (strtolower($fileInfo['extension'])) {
            'jpg', 'jpeg' => 'image/jpeg',
            'png' => 'image/png',
            'gif' => 'image/gif',
            'webp' => 'image/webp',
            default => 'image/jpeg'
        };

        // Extract original filename from the complex filename structure
        $originalFilename = $this->extractOriginalFilename($fileInfo['filename']);

        // Get relative path from storage root
        $relativePath = str_replace($this->uploadsPath . '/', '', $fullPath);
        $pathOnly = dirname($relativePath);

        // Insert into database using the correct table structure
        $sql = "INSERT INTO images (
            ulid, filename, original_filename, mime_type, file_size,
            width, height, hash, path, created_at, updated_at
        ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)";

        $stmt = $this->db->prepare($sql);
        $now = date('Y-m-d H:i:s');

        $stmt->execute([
            $ulidString,
            $fileInfo['filename'],
            $originalFilename,
            $mimeTypeString,
            $fileInfo['size'],
            $width,
            $height,
            $hashValue,
            $pathOnly,
            $now,
            $now
        ]);
    }

    private function extractOriginalFilename(string $filename): string
    {
        // Pattern for files like: BFWCAKKEHTKF5SYR_6626fc6b...cd1_original.png
        if (preg_match('/^[A-Z0-9]{16}_[a-f0-9]{64}_original\.(.+)$/', $filename, $matches)) {
            // This is an original file, try to find the pattern in other files
            $basePattern = substr($filename, 0, strpos($filename, '_original.'));
            // For now, just return a cleaned version
            return "original." . $matches[1];
        }

        // Pattern for simple files like: 00MF9VW9R36NJN3VCFSTS2CK6R.jpg
        if (preg_match('/^[A-Z0-9]{26}\.(.+)$/', $filename, $matches)) {
            return "image." . $matches[1];
        }

        // Fallback: return as-is
        return $filename;
    }
}

// Run the migration
echo "🚀 Starting image migration from filesystem to database...\n\n";

try {
    $migration = new ImageMigrationScript();
    $migration->run();
} catch (Exception $e) {
    echo "💥 Migration failed: " . $e->getMessage() . "\n";
    echo "Stack trace:\n" . $e->getTraceAsString() . "\n";
    exit(1);
}

echo "\n🎉 Migration script completed!\n";