<?php

require_once 'BoxClient.php';

/**
 * BoxFileRetriever - List and Download Files from Box Folders
 *
 * This class handles:
 * 1. Listing files in a Box folder
 * 2. Getting file metadata
 * 3. Downloading files to temp location
 * 4. Extracting tracking IDs from filenames
 */
class BoxFileRetriever
{
    private $boxClient;
    private $tempDir;

    public function __construct($boxConfigFile = 'Box-config.json')
    {
        // Load Box config
        $configPath = __DIR__ . '/../' . $boxConfigFile;
        if (!file_exists($configPath)) {
            throw new Exception("Box config file not found: $configPath");
        }

        $config = json_decode(file_get_contents($configPath), true);
        $clientId = $config['boxAppSettings']['clientID'] ?? null;
        $clientSecret = $config['boxAppSettings']['clientSecret'] ?? null;

        if (!$clientId || !$clientSecret) {
            throw new Exception("Box config missing clientID or clientSecret");
        }

        // Initialize BoxClient with credentials
        $this->boxClient = new BoxClient($clientId, $clientSecret);
        $this->tempDir = sys_get_temp_dir() . '/ferrero_box_downloads';

        // Create temp directory if it doesn't exist
        if (!is_dir($this->tempDir)) {
            mkdir($this->tempDir, 0755, true);
        }
    }

    /**
     * List all files in a Box folder
     *
     * @param string $folderId Box folder ID
     * @return array List of files with metadata
     */
    public function listFilesInFolder($folderId)
    {
        try {
            $accessToken = $this->boxClient->getAccessToken();

            // Call Box API to list folder items
            $url = "https://api.box.com/2.0/folders/$folderId/items?fields=id,name,type,size,modified_at,description";

            $ch = curl_init();
            curl_setopt_array($ch, [
                CURLOPT_URL => $url,
                CURLOPT_RETURNTRANSFER => true,
                CURLOPT_HTTPHEADER => [
                    'Authorization: Bearer ' . $accessToken,
                    'Content-Type: application/json'
                ],
                CURLOPT_TIMEOUT => 60
            ]);

            $response = curl_exec($ch);
            $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
            $error = curl_error($ch);
            curl_close($ch);

            if ($error) {
                throw new Exception("Box API error: $error");
            }

            if ($httpCode !== 200) {
                throw new Exception("Box API returned HTTP $httpCode: $response");
            }

            $data = json_decode($response, true);

            if (!isset($data['entries'])) {
                throw new Exception("Invalid response from Box API");
            }

            // Filter to only files (not folders)
            $files = [];
            foreach ($data['entries'] as $item) {
                if ($item['type'] === 'file') {
                    $files[] = [
                        'id' => $item['id'],
                        'name' => $item['name'],
                        'size' => $item['size'] ?? 0,
                        'modified_at' => $item['modified_at'] ?? null,
                        'description' => $item['description'] ?? '',
                        'box_url' => "https://app.box.com/file/{$item['id']}"
                    ];
                }
            }

            return [
                'success' => true,
                'folder_id' => $folderId,
                'file_count' => count($files),
                'files' => $files
            ];

        } catch (Exception $e) {
            return [
                'success' => false,
                'error' => $e->getMessage(),
                'folder_id' => $folderId
            ];
        }
    }

    /**
     * Get metadata for a specific file
     *
     * @param string $fileId Box file ID
     * @return array File metadata
     */
    public function getFileMetadata($fileId)
    {
        try {
            $accessToken = $this->boxClient->getAccessToken();

            $url = "https://api.box.com/2.0/files/$fileId?fields=id,name,type,size,modified_at,description,created_at,shared_link";

            $ch = curl_init();
            curl_setopt_array($ch, [
                CURLOPT_URL => $url,
                CURLOPT_RETURNTRANSFER => true,
                CURLOPT_HTTPHEADER => [
                    'Authorization: Bearer ' . $accessToken,
                    'Content-Type: application/json'
                ],
                CURLOPT_TIMEOUT => 30
            ]);

            $response = curl_exec($ch);
            $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
            curl_close($ch);

            if ($httpCode !== 200) {
                throw new Exception("Box API returned HTTP $httpCode");
            }

            $data = json_decode($response, true);

            return [
                'success' => true,
                'metadata' => $data
            ];

        } catch (Exception $e) {
            return [
                'success' => false,
                'error' => $e->getMessage()
            ];
        }
    }

    /**
     * Download a file from Box
     *
     * @param string $fileId Box file ID
     * @param string $filename Filename for local save
     * @return array Result with local path
     */
    public function downloadFile($fileId, $filename)
    {
        try {
            $accessToken = $this->boxClient->getAccessToken();

            // Download URL
            $url = "https://api.box.com/2.0/files/$fileId/content";

            $localPath = $this->tempDir . '/' . $filename;

            // Download file
            $ch = curl_init();
            $fp = fopen($localPath, 'w');

            curl_setopt_array($ch, [
                CURLOPT_URL => $url,
                CURLOPT_HTTPHEADER => [
                    'Authorization: Bearer ' . $accessToken
                ],
                CURLOPT_FILE => $fp,
                CURLOPT_FOLLOWLOCATION => true,
                CURLOPT_TIMEOUT => 300
            ]);

            $result = curl_exec($ch);
            $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
            curl_close($ch);
            fclose($fp);

            if (!$result || $httpCode !== 200) {
                unlink($localPath);
                throw new Exception("Download failed with HTTP $httpCode");
            }

            return [
                'success' => true,
                'local_path' => $localPath,
                'size' => filesize($localPath)
            ];

        } catch (Exception $e) {
            return [
                'success' => false,
                'error' => $e->getMessage()
            ];
        }
    }

    /**
     * Extract tracking ID from filename
     *
     * @param string $filename Full filename
     * @return string|null Tracking ID or null if not found
     */
    public function extractTrackingId($filename)
    {
        // Remove extension
        $pathInfo = pathinfo($filename);
        $filenameWithoutExt = $pathInfo['filename'];

        // Split by underscore
        $parts = explode('_', $filenameWithoutExt);

        // Last part should be tracking ID (6 alphanumeric characters)
        if (count($parts) > 0) {
            $lastPart = end($parts);
            if (strlen($lastPart) === 6 && ctype_alnum($lastPart)) {
                return $lastPart;
            }
        }

        return null;
    }

    /**
     * List files with parsed tracking IDs
     *
     * @param string $folderId Box folder ID
     * @return array Files with tracking ID info
     */
    public function listFilesWithTrackingIDs($folderId)
    {
        $result = $this->listFilesInFolder($folderId);

        if (!$result['success']) {
            return $result;
        }

        // Add tracking ID to each file
        foreach ($result['files'] as &$file) {
            $file['tracking_id'] = $this->extractTrackingId($file['name']);
            $file['has_tracking_id'] = !empty($file['tracking_id']);
        }

        return $result;
    }

    /**
     * Get temp directory path
     *
     * @return string
     */
    public function getTempDir()
    {
        return $this->tempDir;
    }

    /**
     * Clean up temp directory
     *
     * @return bool
     */
    public function cleanTempDir()
    {
        if (!is_dir($this->tempDir)) {
            return true;
        }

        $files = glob($this->tempDir . '/*');
        foreach ($files as $file) {
            if (is_file($file)) {
                unlink($file);
            }
        }

        return true;
    }

    /**
     * Test Box connection
     *
     * @return array
     */
    public function testConnection()
    {
        try {
            $accessToken = $this->boxClient->getAccessToken();
            return [
                'success' => true,
                'message' => 'Box connection successful',
                'has_token' => !empty($accessToken)
            ];
        } catch (Exception $e) {
            return [
                'success' => false,
                'error' => $e->getMessage()
            ];
        }
    }
}