<?php
// Load config first (which sets session ini settings before starting session)
require_once 'config.php';

// Require authentication (this will start the session if needed)
if (!isAuthenticated()) {
    echo json_encode(['success' => false, 'error' => 'Authentication required. Please log in.']);
    exit;
}

if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_FILES['voiceFile'])) {
    $file = $_FILES['voiceFile'];
    $outputFormat = isset($_POST['outputFormat']) ? $_POST['outputFormat'] : 'txt';
    $enableTranslation = isset($_POST['enableTranslation']) ? $_POST['enableTranslation'] : '0';
    $targetLanguage = isset($_POST['targetLanguage']) ? $_POST['targetLanguage'] : 'EN-US';

    // Check file size
    if ($file['size'] > 350 * 1024 * 1024) { // 350 MB limit
        echo json_encode(['success' => false, 'error' => "File is too large. Maximum size is 350 MB."]);
        exit;
    }

    // Prepare the file for sending to Python API
    $formData = [
        'audio' => new CURLFile($file['tmp_name'], $file['type'], $file['name']),
        'format' => $outputFormat,
        'translate' => $enableTranslation,
        'target_lang' => $targetLanguage
    ];

    // Build API URL
    $apiUrl = PYTHON_API_URL . '/transcribe';

    // DEBUG: Log the exact URL and configuration
    error_log("=== UPLOAD DEBUG START ===");
    error_log("PYTHON_API_URL constant: " . PYTHON_API_URL);
    error_log("Full API URL: " . $apiUrl);
    error_log("File name: " . $file['name']);
    error_log("File size: " . $file['size']);
    error_log("Output format: " . $outputFormat);

    // Send request to Python API
    $ch = curl_init($apiUrl);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $formData);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_TIMEOUT, 300); // 5 minutes timeout for large files

    $response = curl_exec($ch);
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    $curlError = curl_error($ch);
    $effectiveUrl = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);

    // DEBUG: Log response details
    error_log("HTTP Code: " . $httpCode);
    error_log("cURL Error: " . ($curlError ?: 'none'));
    error_log("Effective URL: " . $effectiveUrl);

    if ($httpCode === 301 || $httpCode === 302) {
        $redirectUrl = curl_getinfo($ch, CURLINFO_REDIRECT_URL);
        error_log("REDIRECT DETECTED!");
        error_log("Redirect Location: " . ($redirectUrl ?: 'not provided'));
    }

    error_log("Response preview: " . substr($response, 0, 500));
    error_log("=== UPLOAD DEBUG END ===");

    if (curl_errno($ch)) {
        echo json_encode(['success' => false, 'error' => "Error processing file: " . curl_error($ch)]);
    } else {

        if ($httpCode === 200) {
            $data = json_decode($response, true);

            if (isset($data['success']) && $data['success']) {
                // Track file ownership in session
                if (!isset($_SESSION['user_files'])) {
                    $_SESSION['user_files'] = [];
                }

                // Add original file to user's file list
                $_SESSION['user_files'][] = $data['filename'];

                // Return content for display and download links
                $downloadUrl = 'download.php?file=' . urlencode($data['filename']);

                $response = [
                    'success' => true,
                    'fileUrl' => $downloadUrl,
                    'filename' => $data['filename'],
                    'format' => $outputFormat
                ];

                // Add content for display (all formats)
                if (isset($data['content'])) {
                    if ($outputFormat === 'txt') {
                        $response['response'] = nl2br(htmlspecialchars($data['content']));
                    } else {
                        // For VTT/SRT, format as preformatted text
                        $response['response'] = '<pre style="text-align: left; white-space: pre-wrap; word-wrap: break-word;">' . htmlspecialchars($data['content']) . '</pre>';
                    }
                }

                // Add translated content if available
                if (isset($data['translated_filename'])) {
                    // Add translated file to user's file list
                    $_SESSION['user_files'][] = $data['translated_filename'];

                    $response['translatedFileUrl'] = 'download.php?file=' . urlencode($data['translated_filename']);
                    $response['translatedFilename'] = $data['translated_filename'];

                    if (isset($data['translated_content'])) {
                        if ($outputFormat === 'txt') {
                            $response['translatedResponse'] = nl2br(htmlspecialchars($data['translated_content']));
                        } else {
                            // For VTT/SRT, format as preformatted text
                            $response['translatedResponse'] = '<pre style="text-align: left; white-space: pre-wrap; word-wrap: break-word;">' . htmlspecialchars($data['translated_content']) . '</pre>';
                        }
                    }
                }

                echo json_encode($response);
            } else {
                echo json_encode(['success' => false, 'error' => $data['error'] ?? "Unknown error occurred"]);
            }
        } else {
            echo json_encode(['success' => false, 'error' => "Server error: HTTP $httpCode"]);
        }
    }

    curl_close($ch);
} else {
    echo json_encode(['success' => false, 'error' => "Invalid request."]);
}