<?php
/**
 * API для привязки документов к проекту/заявке
 * 
 * Использование из n8n:
 * POST https://crm.clientright.ru/api_attach_documents.php
 * 
 * Входные данные (JSON массив):
 * [
 *   {
 *     "contact_id": "320096",
 *     "project_id": "396868",
 *     "ticket_id": "396936",
 *     "filename": "boarding_pass.pdf",
 *     "file_type": "flight_delay_boarding_or_ticket",
 *     "file": "/bucket/path/to/file.pdf"
 *   }
 * ]
 */

error_reporting(E_ALL);
ini_set('display_errors', '0');

// Функция для логирования
function log_message($message) {
    $timestamp = date('Y-m-d H:i:s');
    $line = "[$timestamp] $message\n";
    @file_put_contents(__DIR__ . '/logs/api_attach_documents.log', $line, FILE_APPEND | LOCK_EX);
    error_log('[api_attach_documents] ' . $message);
}

// Функция для JSON ответа
function json_response($data, $code = 200) {
    if (!headers_sent()) {
        http_response_code($code);
        header('Content-Type: application/json; charset=utf-8');
        header('Access-Control-Allow-Origin: *');
        header('Access-Control-Allow-Methods: POST, OPTIONS');
        header('Access-Control-Allow-Headers: Content-Type');
    }
    echo json_encode($data, JSON_UNESCAPED_UNICODE);
    exit;
}

// CORS preflight
if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
    json_response(['status' => 'ok']);
}

// Только POST
if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    json_response(['success' => false, 'error' => 'Method not allowed'], 405);
}

log_message('=== START API REQUEST ===');

// Получаем входные данные
$input = file_get_contents('php://input');
log_message('Raw input: ' . substr($input, 0, 500));

$input = ltrim($input, "\xEF\xBB\xBF\x00\x09\x0A\x0D\x20");
$data = json_decode($input, true);

if (json_last_error() !== JSON_ERROR_NONE) {
    log_message('❌ JSON Error: ' . json_last_error_msg());
    json_response([
        'success' => false,
        'error' => 'Invalid JSON: ' . json_last_error_msg()
    ], 400);
}

// Поддерживаем как массив, так и одиночный объект
$documents_array = is_array($data) && isset($data[0]) ? $data : [$data];

log_message('Processing ' . count($documents_array) . ' document(s)');

// Обрабатываем каждый документ
$processed_documents = [];
$S3_HOST = 'https://s3.twcstorage.ru';

foreach ($documents_array as $idx => $doc) {
    $contact_id = $doc['contact_id'] ?? null;
    $project_id = $doc['project_id'] ?? null;
    $ticket_id = $doc['ticket_id'] ?? null;
    
    // Поддерживаем оба формата: file и file_url
    $file_path = $doc['file'] ?? $doc['file_url'] ?? null;
    
    if (!$file_path) {
        log_message("❌ Document #{$idx}: missing 'file' or 'file_url'");
        continue;
    }
    
    // Строим полный S3 URL
    if (strpos($file_path, 'http') === 0) {
        $file_url = $file_path;
    } elseif (strpos($file_path, '/') === 0) {
        $file_url = $S3_HOST . $file_path;
    } else {
        $file_url = $S3_HOST . '/' . $file_path;
    }
    
    // Поддерживаем оба формата: filename и file_name
    $file_name = $doc['filename'] ?? $doc['file_name'] ?? null;
    
    if (!$file_name) {
        log_message("❌ Document #{$idx}: missing 'filename' or 'file_name'");
        continue;
    }
    
    $file_type = $doc['file_type'] ?? 'Документ';
    
    // Валидация обязательных полей
    if (!$contact_id || !$project_id) {
        log_message("❌ Document #{$idx}: missing contact_id or project_id");
        continue;
    }
    
    log_message("  [{$idx}] {$file_name} (type: {$file_type})");
    log_message("      Contact: {$contact_id}, Project: {$project_id}, Ticket: " . ($ticket_id ?: 'N/A'));
    log_message("      File URL: {$file_url}");
    
    $processed_documents[] = [
        'url' => $file_url,
        'file_name' => $file_name,
        'description' => $file_type,
        'projectid' => (int)$project_id,
        'ticket_id' => $ticket_id ? (int)$ticket_id : null,
        'contactid' => (int)$contact_id,
        'pages' => 1
    ];
}

if (empty($processed_documents)) {
    log_message('❌ No valid documents to process');
    json_response([
        'success' => false,
        'error' => 'No valid documents to process'
    ], 400);
}

log_message('📤 Sending ' . count($processed_documents) . ' documents to upload_documents_to_crm.php');

// Формируем запрос к upload_documents_to_crm.php
$upload_url = 'https://crm.clientright.ru/upload_documents_to_crm.php';

// Берем общие параметры из первого документа
$first_doc = $processed_documents[0];

$payload = json_encode([
    'documents' => $processed_documents,
    'projectid' => $first_doc['projectid'],
    'ticket_id' => $first_doc['ticket_id'],
    'user_id' => 1
], JSON_UNESCAPED_UNICODE);

log_message('Payload: ' . substr($payload, 0, 500));

// Отправляем запрос
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $upload_url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_TIMEOUT, 60);
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'Content-Type: application/json',
    'Content-Length: ' . strlen($payload)
]);

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

if ($response === false) {
    log_message('❌ CURL error: ' . curl_error($ch));
    json_response([
        'success' => false,
        'error' => 'Internal error: ' . curl_error($ch)
    ], 500);
}

log_message("Response HTTP code: {$http_code}");
log_message("Response: " . substr($response, 0, 500));

// Парсим ответ
$result = json_decode($response, true);

if (json_last_error() !== JSON_ERROR_NONE) {
    log_message('❌ Failed to parse response JSON: ' . json_last_error_msg());
    json_response([
        'success' => false,
        'error' => 'Invalid response from upload service'
    ], 500);
}

// Проверяем успешность
if ($result && $result['success'] && isset($result['results'])) {
    $results_array = $result['results'];
    
    // Формируем ответ
    $processed_results = [];
    $errors = [];
    
    foreach ($results_array as $idx => $res) {
        if ($res['status'] === 'success') {
            $crm_result = $res['crm_result'] ?? [];
            
            $processed_results[] = [
                'document_id' => $crm_result['document_id'] ?? null,
                'document_numeric_id' => $crm_result['document_numeric_id'] ?? null,
                'attached_to' => isset($res['ticket_id']) && $res['ticket_id'] ? 'ticket' : 'project',
                'attached_to_id' => $res['ticket_id'] ?? $res['projectid'] ?? null,
                'file_name' => $res['file_name'] ?? null,
                'file_type' => $res['description'] ?? null,
                's3_bucket' => $crm_result['s3_bucket'] ?? null,
                's3_key' => $crm_result['s3_key'] ?? null,
                'file_size' => $crm_result['file_size'] ?? null,
                'message' => $crm_result['message'] ?? null
            ];
            
            log_message("  ✅ [{$idx}] {$res['file_name']} → {$crm_result['document_id']}");
        } else {
            $error_msg = $res['crm_result']['message'] ?? 'Unknown error';
            $errors[] = [
                'file_name' => $res['file_name'] ?? 'Unknown',
                'error' => $error_msg
            ];
            log_message("  ❌ [{$idx}] {$res['file_name']}: {$error_msg}");
        }
    }
    
    log_message('✅ Success: ' . count($processed_results) . ' documents attached');
    
    json_response([
        'success' => true,
        'total_processed' => count($results_array),
        'successful' => count($processed_results),
        'failed' => count($errors),
        'results' => $processed_results,
        'errors' => !empty($errors) ? $errors : null
    ]);
} else {
    log_message('❌ Upload failed: ' . ($result['error']['message'] ?? 'Unknown error'));
    json_response([
        'success' => false,
        'error' => $result['error']['message'] ?? 'Upload failed'
    ], 500);
}