<?php
// api/delete_file.php - Delete file from Google Drive via Apps Script Web App
header('Content-Type: application/json; charset=utf-8');
header('Access-Control-Allow-Origin: *');

require_once __DIR__ . '/../config/db.php';

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    echo json_encode(['status' => 'error', 'message' => 'Invalid request method']);
    exit;
}

$input = json_decode(file_get_contents('php://input'), true);
if (!$input) {
    $input = $_POST;
}

$url = $input['url'] ?? '';

if (empty($url)) {
    echo json_encode(['status' => 'error', 'message' => 'Missing Google Drive File URL']);
    exit;
}

// Extract file ID from Google Drive URL
// Typically: https://drive.google.com/file/d/1XyZ.../view?usp=drivesdk
preg_match('/\/d\/([a-zA-Z0-9_-]+)/', $url, $matches);
if (empty($matches[1])) {
    echo json_encode(['status' => 'error', 'message' => 'Invalid Google Drive URL format']);
    exit;
}

$fileId = $matches[1];

try {
    $dbInfo = getDbConnection();
    $pdo = $dbInfo['pdo'];

    // Get GAS URL from system settings
    $settingsStmt = $pdo->query("SELECT setting_value FROM system_settings WHERE setting_key = 'gdrive_gas_url'");
    $gasUrlRow = $settingsStmt->fetch();
    $gasUrl = $gasUrlRow ? $gasUrlRow['setting_value'] : '';

    if (empty($gasUrl)) {
        echo json_encode(['status' => 'error', 'message' => 'Super Admin ยังไม่ได้ตั้งค่า Google Apps Script Web App URL']);
        exit;
    }

    $payload = json_encode([
        'action' => 'delete',
        'fileId' => $fileId
    ]);

    // Send to GAS via cURL
    $ch = curl_init($gasUrl);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true); // GAS requires follow location for redirects
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
    curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1); // Fix HTTP/2 PROTOCOL_ERROR
    curl_setopt($ch, CURLOPT_HTTPHEADER, [
        'Content-Type: application/json'
    ]);

    $response = curl_exec($ch);
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    
    if(curl_errno($ch)) {
        throw new \Exception(curl_error($ch));
    }
    curl_close($ch);

    $resData = json_decode($response, true);
    if (!$resData) {
        throw new \Exception("Invalid JSON response from GAS: " . $response);
    }

    echo json_encode($resData);

} catch (\Exception $e) {
    echo json_encode(['status' => 'error', 'message' => $e->getMessage()]);
    exit;
}