<?php
require_once 'config.php';
require_once 'logger.php';
require_once 'api_client.php';

header('Content-Type: application/json');
session_start();

try {
    Logger::log('Starting video processing');
    
    if (!isset($_SESSION['video_request'])) {
        Logger::log('Session data: ' . print_r($_SESSION, true));
        throw new Exception('No video request found in session');
    }
    
    $videoRequest = $_SESSION['video_request'];
    Logger::log('Video request data: ' . print_r($videoRequest, true));
    
    if (!isset($videoRequest['requestId'])) {
        throw new Exception('No request ID found in session data');
    }
    
    $requestId = $videoRequest['requestId'];
    Logger::log("Using request ID: $requestId");
    
    // Verify the file still exists
    if (!file_exists($videoRequest['file']['tmp_name'])) {
        throw new Exception('Upload file not found: ' . $videoRequest['file']['tmp_name']);
    }
    
    $apiClient = new TopazApiClient(Config::API_KEY);
    
    // Accept the request with the same video info from estimation
    Logger::log("Accepting request ID: $requestId");
    $acceptResponse = $apiClient->acceptVideoRequest($requestId);
    Logger::log('Accept response: ' . json_encode($acceptResponse));
    
    if (!isset($acceptResponse['urls']) || !is_array($acceptResponse['urls'])) {
        throw new Exception('Invalid upload URLs received from API');
    }
    
    $uploadUrls = $acceptResponse['urls'];
    Logger::log("Received " . count($uploadUrls) . " upload URLs");
    
    // Upload the file parts
    $uploadResults = [];
    $fileSize = filesize($videoRequest['file']['tmp_name']);
    $partSize = ceil($fileSize / count($uploadUrls));
    
    foreach ($uploadUrls as $index => $url) {
        $partNum = $index + 1;
        Logger::log("Uploading part $partNum");
        
        $handle = fopen($videoRequest['file']['tmp_name'], 'rb');
        if (!$handle) {
            throw new Exception('Could not open file for reading');
        }
        
        // Seek to the correct position for this part
        fseek($handle, $index * $partSize);
        
        // Create curl handle
        $ch = curl_init($url);
        
        // Setup curl options
        curl_setopt_array($ch, [
            CURLOPT_CUSTOMREQUEST => 'PUT',
            CURLOPT_UPLOAD => true,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_INFILE => $handle,
            CURLOPT_INFILESIZE => min($partSize, $fileSize - ($index * $partSize)),
            CURLOPT_HEADER => true
        ]);
        
        // Execute the request
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        
        fclose($handle);
        
        if ($httpCode !== 200) {
            throw new Exception("Failed to upload part $partNum. HTTP Code: $httpCode");
        }
        
        // Extract ETag from response headers
        if (preg_match('/ETag: "([^"]+)"/', $response, $matches)) {
            $eTag = $matches[1];
            $uploadResults[] = [
                'partNum' => $partNum,
                'eTag' => $eTag
            ];
            Logger::log("Successfully uploaded part $partNum with ETag: $eTag");
        } else {
            throw new Exception("No ETag found in response for part $partNum");
        }
        
        curl_close($ch);
    }
    
    // Complete the upload
    Logger::log("Completing upload with results: " . json_encode($uploadResults));
    $completeResponse = $apiClient->completeUpload($requestId, $uploadResults);
    Logger::log("Complete upload response: " . json_encode($completeResponse));
    
    // Store request ID in session
    $_SESSION['current_request_id'] = $requestId;
    
    Logger::log("Processing started with request ID: $requestId");
    
    $response = ['requestId' => $requestId, 'status' => 'success'];
    Logger::log("Sending response: " . json_encode($response));
    echo json_encode($response);
    
} catch (Exception $e) {
    Logger::log('Error during processing: ' . $e->getMessage(), 'ERROR');
    Logger::log('Error trace: ' . $e->getTraceAsString(), 'ERROR');
    http_response_code(400);
    $errorResponse = ['error' => $e->getMessage(), 'status' => 'error'];
    Logger::log("Sending error response: " . json_encode($errorResponse));
    echo json_encode($errorResponse);
}
?>