<?php

namespace App\Utils;

use GuzzleHttp\Client;
use Exception;

class ImageDownloader
{
    private Client $httpClient;
    private string $basePath;

    public function __construct(string $basePath = 'public/images', ?string $apiKey = null)
    {
        $headers = [
            'User-Agent' => 'MediaCollector/1.0'
        ];

        if ($apiKey) {
            $headers['ApiKey'] = $apiKey;
        }

        $this->httpClient = new Client([
            'timeout' => 30,
            'headers' => $headers
        ]);
        $this->basePath = rtrim($basePath, '/');
    }

    /**
     * Download an image from URL and save it locally
     */
    public function downloadImage(string $url, string $filename, string $subfolder = ''): ?string
    {
        if (empty($url) || !filter_var($url, FILTER_VALIDATE_URL)) {
            error_log("Invalid URL provided: {$url}");
            return null;
        }

        try {
            $folderPath = $this->basePath;
            if (!empty($subfolder)) {
                $folderPath .= '/' . trim($subfolder, '/');
            }

            // Create folder if it doesn't exist
            if (!is_dir($folderPath)) {
                mkdir($folderPath, 0755, true);
            }

            $filePath = $folderPath . '/' . $filename;

            // Check if file already exists
            if (file_exists($filePath)) {
                return $filePath;
            }

            error_log("Downloading image from: {$url} to: {$filePath}");

            $response = $this->httpClient->get($url, [
                'sink' => $filePath,
                'headers' => [
                    'User-Agent' => 'MediaCollector/1.0',
                    'Accept' => 'image/*',
                ]
            ]);

            $statusCode = $response->getStatusCode();
            $contentType = $response->getHeaderLine('content-type');

            error_log("Download response - Status: {$statusCode}, Content-Type: {$contentType}");

            if ($statusCode === 200) {
                $fileSize = filesize($filePath);
                error_log("Successfully downloaded image. Size: {$fileSize} bytes");

                // Check if file is actually an image and not empty
                if ($fileSize > 0) {
                    $imageInfo = getimagesize($filePath);
                    if ($imageInfo !== false) {
                        error_log("Valid image downloaded: {$imageInfo[0]}x{$imageInfo[1]} {$imageInfo['mime']}");
                        return $filePath;
                    } else {
                        error_log("Downloaded file is not a valid image");
                        if (file_exists($filePath)) {
                            unlink($filePath);
                        }
                    }
                } else {
                    error_log("Downloaded file is empty");
                    if (file_exists($filePath)) {
                        unlink($filePath);
                    }
                }
            } else {
                error_log("Failed to download image. HTTP Status: {$statusCode}");
            }

            return null;
        } catch (Exception $e) {
            // Log error but don't throw - images are not critical
            error_log("Failed to download image {$url}: " . $e->getMessage());
            return null;
        }
    }

    /**
     * Generate a unique filename for an image
     */
    public function generateFilename(string $url, string $prefix = ''): string
    {
        $extension = pathinfo(parse_url($url, PHP_URL_PATH), PATHINFO_EXTENSION);
        if (empty($extension)) {
            $extension = 'jpg'; // Default fallback
        }

        $hash = substr(md5($url . time()), 0, 8);

        return ($prefix ? $prefix . '_' : '') . $hash . '.' . $extension;
    }

    /**
     * Get the public URL for a local image
     */
    public function getPublicUrl(string $localPath): ?string
    {
        if (empty($localPath) || !file_exists($localPath)) {
            return null;
        }

        // Remove the public/ prefix to get the web-accessible path
        $relativePath = str_replace($this->basePath . '/', '', $localPath);

        return '/' . $relativePath;
    }
}