<?php
namespace App\Services;

/**
 * Class NotificationService
 * Enterprise Multi-Channel Notification Gateway (LINE Notify & LINE OA Flex Message)
 *
 * @package App\Services
 */
class NotificationService
{
    private string $lineNotifyToken;
    private bool $notifyEnabled;

    public function __construct()
    {
        $config = require __DIR__ . '/../../config/integration.php';
        $notif = $config['notification'];
        $this->lineNotifyToken = $notif['line_notify']['token'] ?? '';
        $this->notifyEnabled = $notif['line_notify']['enabled'] ?? true;
    }

    /**
     * Notify when a new queue is assigned via Smart AI
     */
    public function notifyQueueAssigned(array $queueData): bool
    {
        if (!$this->notifyEnabled || empty($this->lineNotifyToken)) return false;

        $msg = "\n🟢 [จัดสรรคิวอัตโนมัติสำเร็จ]\n";
        $msg .= "• หมายเลขคิว: {$queueData['queue_no']}\n";
        $msg .= "• รหัสหมอนวด: T-{$queueData['assigned_therapist_id']}\n";
        $msg .= "• รหัสห้องพัก: R-{$queueData['assigned_room_id']}\n";
        $msg .= "• เวลาเริ่มประมาณการ: {$queueData['est_start_time']}\n";
        $msg .= "• ข้อความจาก AI: {$queueData['ai_message']}";

        return $this->sendLineNotify($msg);
    }

    /**
     * Notify when TV display calls a queue
     */
    public function notifyQueueCalled(string $queueNo, string $roomNo, string $patientName): bool
    {
        if (!$this->notifyEnabled || empty($this->lineNotifyToken)) return false;

        $msg = "\n📣 [เรียกคิวเข้ารับบริการ]\n";
        $msg .= "• ขอเชิญคิวหมายเลข: {$queueNo}\n";
        $msg .= "• ผู้รับบริการ: {$patientName}\n";
        $msg .= "• เข้ารับบริการที่ห้อง: {$roomNo}\n";

        return $this->sendLineNotify($msg);
    }

    /**
     * Send raw LINE Notify HTTP POST request
     */
    private function sendLineNotify(string $message): bool
    {
        $ch = curl_init("https://notify-api.line.me/api/notify");
        curl_setopt_array($ch, [
            CURLOPT_POST => true,
            CURLOPT_POSTFIELDS => http_build_query(['message' => $message]),
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_TIMEOUT => 3,
            CURLOPT_HTTPHEADER => [
                "Authorization: Bearer {$this->lineNotifyToken}",
                "Content-Type: application/x-www-form-urlencoded",
            ],
            CURLOPT_SSL_VERIFYPEER => false,
        ]);

        $res = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);

        return $httpCode === 200;
    }
}