<?php

declare(strict_types=1);

namespace App\Services\Crawler;

use App\Enums\CrawlAlertSeverity;
use App\Models\CrawlAlert;
use App\Models\CrawlRule;
use App\Models\CrawlRun;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Mail;

class CrawlAlertService
{
    public function notify(
        CrawlAlertSeverity $severity,
        string $type,
        string $message,
        ?CrawlRule $rule = null,
        ?CrawlRun $run = null,
        ?array $context = null,
    ): CrawlAlert {
        $alert = CrawlAlert::query()->create([
            'run_id' => $run?->id,
            'rule_id' => $rule?->id,
            'severity' => $severity,
            'type' => $type,
            'message' => $message,
            'context' => $context,
            'is_resolved' => false,
        ]);

        $recipient = $rule?->alert_email ?: config('crawler.default_alert_email');

        if (is_string($recipient) && $recipient !== '') {
            try {
                Mail::raw($this->buildEmailBody($alert), static function ($mail) use ($recipient, $severity): void {
                    $mail->to($recipient)
                        ->subject(sprintf('[Crawler][%s] 采集告警', strtoupper($severity->value)));
                });
            } catch (\Throwable $exception) {
                Log::warning('Crawler alert email failed', [
                    'alert_id' => $alert->id,
                    'error' => $exception->getMessage(),
                ]);
            }
        }

        return $alert;
    }

    private function buildEmailBody(CrawlAlert $alert): string
    {
        $lines = [
            '采集告警通知',
            sprintf('等级: %s', $alert->severity?->value ?? 'unknown'),
            sprintf('类型: %s', $alert->type),
            sprintf('信息: %s', $alert->message),
            sprintf('规则ID: %s', (string) ($alert->rule_id ?? '-')),
            sprintf('运行ID: %s', (string) ($alert->run_id ?? '-')),
            sprintf('时间: %s', (string) $alert->created_at),
        ];

        if (is_array($alert->context) && $alert->context !== []) {
            $lines[] = '上下文:';
            $lines[] = json_encode($alert->context, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT) ?: '{}';
        }

        return implode("\n", $lines);
    }
}