package rmq

import (
	"context"
	"errors"
	"github.com/fox/fox/log"
	amqp "github.com/rabbitmq/amqp091-go"
	"time"
)

type Connection struct {
	conn          *amqp.Connection
	channel       *amqp.Channel
	config        *RabbitMQConfig
	isConnected   bool
	done          chan bool
	notifyClose   chan *amqp.Error
	notifyConfirm chan amqp.Confirmation
}

func NewConnection(config *RabbitMQConfig) (*Connection, error) {
	conn := &Connection{
		config: config,
		done:   make(chan bool),
	}

	if err := conn.Connect(); err != nil {
		return nil, err
	}

	return conn, nil
}

func (c *Connection) Connect() error {
	var err error

	// 建立连接
	c.conn, err = amqp.Dial(c.config.URL)
	if err != nil {
		return errors.Join(err, errors.New("failed to connect to RabbitMQ"))
	}

	// 创建通道
	c.channel, err = c.conn.Channel()
	if err != nil {
		return errors.Join(err, errors.New("failed to open channel"))
	}

	// 设置QoS
	err = c.channel.Qos(c.config.PrefetchCount, 0, false)
	if err != nil {
		return errors.Join(err, errors.New("failed to set QoS"))
	}

	// 声明交换器
	err = c.channel.ExchangeDeclare(
		c.config.ExchangeName,
		"direct",
		true,
		false,
		false,
		false,
		nil,
	)
	if err != nil {
		return errors.Join(err, errors.New("failed to declare exchange"))
	}

	// 声明队列
	_, err = c.channel.QueueDeclare(
		c.config.QueueName, // 队列名称
		c.config.Durable,   // 持久化 true：队列元数据（名称、属性）和消息会写入磁盘，RabbitMQ 重启后仍存在。false：队列存在于内存，重启后丢失。
		false,              // 不自动删除 true：当最后一个消费者断开连接后，队列自动删除。
		false,              // 非独占队列
		false,              // 等待服务器确认
		nil,
	)
	if err != nil {
		return errors.Join(err, errors.New("failed to declare queue"))
	}

	// 绑定队列
	err = c.channel.QueueBind(
		c.config.QueueName,
		c.config.RoutingKey,
		c.config.ExchangeName,
		false,
		nil,
	)
	if err != nil {
		return errors.Join(err, errors.New("failed to bind queue"))
	}

	// 设置确认通道
	c.notifyClose = make(chan *amqp.Error)
	if err = c.channel.Confirm(false); err != nil {
		return errors.Join(err, errors.New("failed to set confirm"))
	}
	c.notifyConfirm = make(chan amqp.Confirmation)
	c.channel.NotifyClose(c.notifyClose)
	c.channel.NotifyPublish(c.notifyConfirm)

	c.isConnected = true
	log.Info("RabbitMQ connection established successfully")

	return nil
}

func (c *Connection) Reconnect(ctx context.Context) {
	for {
		select {
		case <-ctx.Done():
			return
		case <-c.done:
			return
		case err := <-c.notifyClose:
			if err != nil {
				log.ErrorF("RabbitMQ connection closed: %v", err)
				c.isConnected = false

				// 重连逻辑
				for {
					if err := c.Connect(); err != nil {
						log.ErrorF("Failed to reconnect: %v. Retrying in %vs", err, c.config.ReconnectInterval)
						time.Sleep(time.Duration(c.config.ReconnectInterval) * time.Second)
						continue
					}
					break
				}
			}
		}
	}
}

func (c *Connection) Close() error {
	close(c.done)

	if c.channel != nil {
		if err := c.channel.Close(); err != nil {
			return err
		}
	}

	if c.conn != nil {
		if err := c.conn.Close(); err != nil {
			return err
		}
	}

	c.isConnected = false
	log.Info("RabbitMQ connection closed")
	return nil
}

func (c *Connection) IsConnected() bool {
	return c.isConnected
}

func (c *Connection) GetChannel() *amqp.Channel {
	return c.channel
}