<?php

namespace App\Services;

use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;

class DingTalkService
{
    private ?string $webhook;
    private ?string $secret;

    public function __construct()
    {
        $config = config('services.dingtalk', []);
        $this->webhook = $config['webhook'] ?? null;
        $this->secret = $config['secret'] ?? null;
    }

    public function sendText(string $message, array $atMobiles = [], bool $atAll = false): void
    {
        if (empty($this->webhook)) {
            Log::warning('DingTalk webhook is not configured, skip sending alert. Alert content logged below.', [
                'message' => $message,
                'atMobiles' => $atMobiles,
                'atAll' => $atAll,
            ]);
            return;
        }

        $payload = [
            'msgtype' => 'text',
            'text' => [
                'content' => $message,
            ],
            'at' => [
                'atMobiles' => $atMobiles,
                'isAtAll' => $atAll,
            ],
        ];

        $url = $this->webhook;
        if (!empty($this->secret)) {
            $timestamp = (int) round(microtime(true) * 1000);
            $stringToSign = $timestamp . "\n" . $this->secret;
            $sign = base64_encode(hash_hmac('sha256', $stringToSign, $this->secret, true));
            $encodedSign = urlencode($sign);
            $separator = str_contains($url, '?') ? '&' : '?';
            $url .= "{$separator}timestamp={$timestamp}&sign={$encodedSign}";
        }

        try {
            Http::timeout(10)->asJson()->post($url, $payload);
        } catch (\Throwable $e) {
            Log::error('Failed to send DingTalk alert', [
                'message' => $e->getMessage(),
            ]);
        }
    }
}