<?php

namespace App\Console\Commands;

use Illuminate\Console\Command;
use PhpAmqpLib\Connection\AMQPStreamConnection;
use PhpAmqpLib\Message\AMQPMessage;
use PhpAmqpLib\Channel\AMQPChannel;
use App\Jobs\ProcessAITranslateJob;
use App\Jobs\BaseRabbitMQJob;
use Illuminate\Support\Facades\Log;
use PhpAmqpLib\Exception\AMQPTimeoutException;


class RabbitMQWorker extends Command
{
    /**
     * The name and signature of the console command.
     * php artisan rabbitmq:consume ai_translate
     * @var string
     */
    protected $signature = 'rabbitmq:consume {queue} {--reset-loop-count}';
    protected $description = '消费 RabbitMQ 队列消息';

    private $connection;
    private $channel;
    private $processedCount = 0;
    private $maxLoopCount = 0;
    private $queueName;
    private $queueConfig;
    private $shouldStop = false;
    private $timeout = 15;
    public function handle()
    {
        $this->queueName = $this->argument('queue');
        $this->queueConfig = config("mint.rabbitmq.queues.{$this->queueName}");

        if (!$this->queueConfig) {
            $this->error("队列 {$this->queueName} 的配置不存在");
            return 1;
        }

        $this->maxLoopCount = $this->queueConfig['max_loop_count'];

        $this->info("启动 RabbitMQ Worker");
        $this->info("队列: {$this->queueName}");
        $this->info("最大循环次数: {$this->maxLoopCount}");
        $this->info("重试次数: {$this->queueConfig['retry_times']}");

        try {
            $this->setupConnection();
            $this->setupQueues();
            $this->startConsuming();
        } catch (\Exception $e) {
            $this->error("Worker 启动失败: " . $e->getMessage());
            Log::error("RabbitMQ Worker 启动失败", [
                'queue' => $this->queueName,
                'error' => $e->getMessage()
            ]);
            return 1;
        } finally {
            $this->cleanup();
        }

        return 0;
    }

    private function setupConnection()
    {
        $config = config('queue.connections.rabbitmq');
        $this->connection = new AMQPStreamConnection(
            $config['host'],
            $config['port'],
            $config['user'],
            $config['password'],
            $config['virtual_host']
        );

        $this->channel = $this->connection->channel();

        // 设置 QoS - 每次只处理一条消息
        $this->channel->basic_qos(null, 1, null);
    }

    private function setupQueues()
    {
        // 声明主队列
        $this->channel->queue_declare(
            $this->queueName,
            false,  // passive
            true,   // durable
            false,  // exclusive
            false,  // auto_delete
            false,  // nowait
            [
                'x-dead-letter-exchange' => ['S', ''],
                'x-dead-letter-routing-key' => ['S', $this->queueConfig['dead_letter_queue']]
            ]
        );

        // 声明死信队列
        $dlqName = $this->queueConfig['dead_letter_queue'];
        $dlqConfig = config("rabbitmq.dead_letter_queues.{$dlqName}", []);

        $dlqArgs = [];
        if (isset($dlqConfig['ttl'])) {
            $dlqArgs['x-message-ttl'] = ['I', $dlqConfig['ttl']];
        }
        if (isset($dlqConfig['max_length'])) {
            $dlqArgs['x-max-length'] = ['I', $dlqConfig['max_length']];
        }

        $this->channel->queue_declare(
            $dlqName,
            false,  // passive
            true,   // durable
            false,  // exclusive
            false,  // auto_delete
            false,  // nowait
            $dlqArgs
        );

        $this->info("队列设置完成，死信队列: {$dlqName}");
    }

    private function startConsuming()
    {
        $callback = function (AMQPMessage $msg) {
            $this->processMessage($msg);
        };

        $this->channel->basic_consume(
            $this->queueName,
            '',     // consumer_tag
            false,  // no_local
            false,  // no_ack
            false,  // exclusive
            false,  // nowait
            $callback
        );

        $this->info("开始消费消息... 按 Ctrl+C 退出");

        // 设置信号处理
        if (extension_loaded('pcntl')) {
            pcntl_signal(SIGTERM, [$this, 'handleSignal']);
            pcntl_signal(SIGINT, [$this, 'handleSignal']);
        }

        while ($this->channel->is_consuming() && !$this->shouldStop) {
            try {
                $this->channel->wait(null, false, $this->timeout);
            } catch (AMQPTimeoutException $e) {
                // ignore it
            }


            if (extension_loaded('pcntl')) {
                pcntl_signal_dispatch();
            }

            // 检查是否达到最大循环次数
            if ($this->processedCount >= $this->maxLoopCount) {
                $this->info("达到最大循环次数 ({$this->maxLoopCount})，Worker 自动退出");
                break;
            }
        }
    }

    private function processMessage(AMQPMessage $msg)
    {
        try {
            $data = json_decode($msg->body, true);

            if (json_last_error() !== JSON_ERROR_NONE) {
                throw new \Exception("JSON 解析失败: " . json_last_error_msg());
            }

            // 获取重试次数（从消息头中获取）
            $retryCount = 0;
            if ($msg->has('application_headers')) {
                $headers = $msg->get('application_headers')->getNativeData();
                $retryCount = $headers['retry_count'] ?? 0;
            }

            // 根据队列类型创建对应的 Job
            $job = $this->createJob($data, $retryCount);

            try {
                // 执行业务逻辑
                $job->handle();

                // 成功处理，确认消息
                $msg->ack();
                $this->processedCount++;

                $this->info("消息处理成功 [{$this->processedCount}/{$this->maxLoopCount}]");
            } catch (\Exception $e) {
                $this->handleJobException($msg, $data, $retryCount, $e);
            }
        } catch (\Exception $e) {
            $this->error("消息处理异常: " . $e->getMessage());
            Log::error("RabbitMQ 消息处理异常", [
                'queue' => $this->queueName,
                'error' => $e->getMessage(),
                'message_body' => $msg->body
            ]);

            // 拒绝消息并发送到死信队列
            $msg->nack(false, false);
            $this->processedCount++;
        }
    }

    private function createJob(array $data, int $retryCount): BaseRabbitMQJob
    {
        // 根据队列名称创建对应的 Job 实例
        switch ($this->queueName) {
            case 'ai_translate':
                return new ProcessAITranslateJob($this->queueName, $data, $retryCount);
                // 可以添加更多队列类型
            default:
                throw new \Exception("未知的队列类型: {$this->queueName}");
        }
    }

    private function handleJobException(AMQPMessage $msg, array $data, int $retryCount, \Exception $e)
    {
        $maxRetries = $this->queueConfig['retry_times'];

        if ($retryCount < $maxRetries - 1) {
            // 还有重试机会，重新入队
            $this->requeueMessage($msg, $data, $retryCount + 1);
            $this->info("消息重新入队，重试次数: " . ($retryCount + 1) . "/{$maxRetries}");
        } else {
            // 超过重试次数，发送到死信队列
            $this->sendToDeadLetterQueue($data, $e);
            $msg->ack(); // 确认原消息以避免重复
            $this->error("消息超过最大重试次数，已发送到死信队列");
        }

        $this->processedCount++;
    }

    private function requeueMessage(AMQPMessage $msg, array $data, int $newRetryCount)
    {
        // 添加重试计数到消息头
        $headers = [
            'retry_count' => $newRetryCount,
            'original_queue' => $this->queueName,
            'retry_timestamp' => time()
        ];

        $newMsg = new AMQPMessage(
            json_encode($data),
            [
                'delivery_mode' => AMQPMessage::DELIVERY_MODE_PERSISTENT,
                'application_headers' => $headers
            ]
        );

        // 发布到同一队列
        $this->channel->basic_publish($newMsg, '', $this->queueName);

        // 确认原消息
        $msg->ack();
    }

    private function sendToDeadLetterQueue(array $data, \Exception $e)
    {
        $dlqName = $this->queueConfig['dead_letter_queue'];

        $dlqData = [
            'original_message' => $data,
            'failure_reason' => $e->getMessage(),
            'failed_at' => date('Y-m-d H:i:s'),
            'queue' => $this->queueName,
            'max_retries' => $this->queueConfig['retry_times']
        ];

        $dlqMsg = new AMQPMessage(
            json_encode($dlqData),
            ['delivery_mode' => AMQPMessage::DELIVERY_MODE_PERSISTENT]
        );

        $this->channel->basic_publish($dlqMsg, '', $dlqName);

        Log::error("消息发送到死信队列", [
            'original_queue' => $this->queueName,
            'dead_letter_queue' => $dlqName,
            'data' => $data,
            'error' => $e->getMessage()
        ]);
    }

    public function handleSignal($signal)
    {
        $this->info("接收到退出信号，正在优雅关闭...");
        $this->shouldStop = true;

        if ($this->channel && $this->channel->is_consuming()) {
            $this->channel->basic_cancel_on_shutdown(true);
        }
    }

    private function cleanup()
    {
        try {
            if ($this->channel) {
                $this->channel->close();
            }
            if ($this->connection) {
                $this->connection->close();
            }

            $this->info("连接已关闭，处理了 {$this->processedCount} 条消息");
        } catch (\Exception $e) {
            $this->error("清理资源时出错: " . $e->getMessage());
        }
    }
}