<?php
error_reporting(E_ALL);
ini_set('display_errors', 0); // Don't print errors to output directly to not break JSON

require_once '../config.php';
header('Content-Type: application/json');

if (!function_exists('curl_init')) {
    echo json_encode(['status' => 'error', 'message' => 'เซิร์ฟเวอร์ของคุณไม่รองรับ cURL (cURL extension is missing)']);
    exit;
}

if (!isLoggedIn() || !isAdmin()) {
    echo json_encode(['status' => 'error', 'message' => 'Unauthorized access']);
    exit;
}

$type = $_POST['type'] ?? '';

if ($type === 'line') {
    $token = $_POST['token'] ?? '';
    if (empty($token)) {
        echo json_encode(['status' => 'error', 'message' => 'กรุณากรอก Token ก่อนทดสอบ']);
        exit;
    }
    
    $tomorrow = date('d/m/Y', strtotime('+1 day'));
    $message = "⚠️ แจ้งเตือนกำหนดส่งงาน ⚠️\n";
    $message .= "เรียนคุณ: นักเรียนทดสอบ (Test)\n";
    $message .= "งาน: ทดสอบระบบแจ้งเตือน\n";
    $message .= "กำหนดส่ง: {$tomorrow}\n";
    $message .= "สถานะ: เหลือเวลาอีก 1 วัน!\n";
    $message .= "กรุณาตรวจสอบระบบ";
    
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, "https://notify-api.line.me/api/notify");
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query(array('message' => $message)));
    $headers = array('Content-type: application/x-www-form-urlencoded', 'Authorization: Bearer ' . $token);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    
    $result = curl_exec($ch);
    $error_msg = curl_error($ch);
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);
    
    if ($result === false) {
        echo json_encode(['status' => 'error', 'message' => 'cURL Error: ' . $error_msg]);
    } elseif ($httpCode == 200) {
        echo json_encode(['status' => 'success', 'message' => 'ส่งข้อความทดสอบ LINE สำเร็จ']);
    } else {
        $resObj = json_decode($result, true);
        $reason = isset($resObj['message']) ? $resObj['message'] : 'HTTP Code ' . $httpCode;
        echo json_encode(['status' => 'error', 'message' => 'ไม่สามารถส่งข้อความได้: ' . $reason]);
    }
} elseif ($type === 'telegram') {
    $bot_token = $_POST['bot_token'] ?? '';
    $chat_id = $_POST['chat_id'] ?? '';
    
    if (empty($bot_token) || empty($chat_id)) {
        echo json_encode(['status' => 'error', 'message' => 'กรุณากรอก Bot Token และ Chat ID ก่อนทดสอบ']);
        exit;
    }
    
    $tomorrow = date('d/m/Y', strtotime('+1 day'));
    $message = "⚠️ <b>แจ้งเตือนกำหนดส่งงาน (Test)</b> ⚠️\n\n";
    $message .= "👤 เรียนคุณ: นักเรียนทดสอบ\n";
    $message .= "📝 งาน: <b>ทดสอบระบบการแจ้งเตือน</b>\n";
    $message .= "📅 กำหนดส่ง: {$tomorrow}\n";
    $message .= "⏳ สถานะ: <b>เหลือเวลาอีก 1 วัน!</b>\n";
    
    $url = "https://api.telegram.org/bot{$bot_token}/sendMessage";
    $data = [
        'chat_id' => $chat_id,
        'text' => $message,
        'parse_mode' => 'HTML'
    ];
    
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data));
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    
    $result = curl_exec($ch);
    $error_msg = curl_error($ch);
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);
    
    if ($result === false) {
        echo json_encode(['status' => 'error', 'message' => 'cURL Error: ' . $error_msg]);
    } elseif ($httpCode == 200) {
        echo json_encode(['status' => 'success', 'message' => 'ส่งข้อความทดสอบ Telegram สำเร็จ']);
    } else {
        $resObj = json_decode($result, true);
        $reason = isset($resObj['description']) ? $resObj['description'] : 'HTTP Code ' . $httpCode;
        echo json_encode(['status' => 'error', 'message' => 'ไม่สามารถส่งข้อความได้: ' . $reason]);
    }
} else {
    echo json_encode(['status' => 'error', 'message' => 'Invalid request type']);
}
?>