<?php

namespace App\Services;

use Carbon\CarbonImmutable;
use Illuminate\Database\DatabaseManager;

class AgentConsumerDelayMonitorService
{
    public const STATE_CONFIG_KEY = 'agent_consumer_delay_monitor.alerts';

    private const DELAY_THRESHOLD_MINUTES = 5;

    public function __construct(
        private readonly DatabaseManager $database,
        private readonly DingTalkService $dingTalkService,
        private readonly ConfigService $configService
    ) {}

    public function check(): array
    {
        $now = CarbonImmutable::now();
        $latestPending = $this->database->connection('agentslave')
            ->table('crm_event_consumer')
            ->select(['event_name', 'created'])
            ->where('status', '<>', 1)
            ->orderByDesc('id')
            ->first();

        $eventName = $latestPending?->event_name;
        $created = $latestPending ? CarbonImmutable::parse($latestPending->created) : null;
        $delayMinutes = $created?->diffInMinutes($now, false);
        $isDelayed = $delayMinutes !== null && $delayMinutes > self::DELAY_THRESHOLD_MINUTES;

        $previousState = $this->configService->get(self::STATE_CONFIG_KEY, []);
        $previousState = is_array($previousState) ? $previousState : [];
        $wasDelayed = $previousState !== [];
        $alertedCount = 0;
        $recoveredCount = 0;

        if ($isDelayed && ! $wasDelayed
            && $this->dingTalkService->sendText($this->buildDelayAlert($eventName, $created, $delayMinutes, $now))) {
            $this->configService->set(self::STATE_CONFIG_KEY, [
                'event_name' => $eventName,
                'delayed_since' => $created->toDateTimeString(),
            ], 'Agent 消费延迟告警状态');
            $alertedCount = 1;
        } elseif (! $isDelayed && $wasDelayed
            && $this->dingTalkService->sendText($this->buildRecoveryNotice($eventName, $delayMinutes, $now))) {
            $this->configService->set(self::STATE_CONFIG_KEY, [], 'Agent 消费延迟告警状态');
            $recoveredCount = 1;
        }

        return [
            'checked_at' => $now->toDateTimeString(),
            'event_name' => $eventName,
            'consumer_time' => $created?->toDateTimeString(),
            'delay_minutes' => $delayMinutes === null ? null : (int) floor($delayMinutes),
            'alerted_count' => $alertedCount,
            'recovered_count' => $recoveredCount,
        ];
    }

    private function buildDelayAlert(
        string $eventName,
        CarbonImmutable $created,
        float $delayMinutes,
        CarbonImmutable $now
    ): string {
        return implode("\n", [
            '⚠️ 【Agent 消费延迟告警】',
            'eventname: '.$eventName,
            '消费到: '.$created->toDateTimeString(),
            sprintf('延迟: %d 分钟', (int) floor($delayMinutes)),
            '检查时间: '.$now->toDateTimeString(),
        ]);
    }

    private function buildRecoveryNotice(
        ?string $eventName,
        ?float $delayMinutes,
        CarbonImmutable $now
    ): string {
        $lines = [
            '✅ 【Agent 消费延迟恢复】',
            '检查时间: '.$now->toDateTimeString(),
        ];

        if ($eventName !== null && $delayMinutes !== null) {
            $lines[] = '当前 eventname: '.$eventName;
            $lines[] = sprintf('当前延迟: %d 分钟', (int) floor($delayMinutes));
        } else {
            $lines[] = '当前无待消费消息';
        }

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