package parser

import (
	"log"
	"runtime"
	"sync"
	"time"

	"github.com/streadway/amqp"
)

// Queue Youmi的队列
type Queue struct {
	url      string `yaml:"url"`
	exchange string `yaml:"exchange"`
	routekey string `yaml:"routekey"`

	mutex sync.Mutex
	conn  *amqp.Connection

	contentType string
}

// NewQueue youmi queue队列 mq
func NewQueue(url string, exchange, routekey string) *Queue {
	que := Queue{url: url, exchange: exchange, routekey: routekey}
	que.contentType = "application/json"

	if err := que.Connect(); err != nil {
		panic(err)
	}
	return &que
}

// SetContentType 设置发送的类型, 让接收端好判断
func (que *Queue) SetContentType(ct string) {
	que.mutex.Lock()
	defer que.mutex.Unlock()

	que.contentType = ct
}

// Connect 链接MQ
func (que *Queue) Connect() error {
	que.mutex.Lock()
	defer que.mutex.Unlock()

	conn, err := amqp.Dial(que.url)
	if err != nil {
		return err
	}
	que.conn = conn
	runtime.SetFinalizer(que.conn, func(obj *amqp.Connection) {
		que.conn.Close()
	})
	return nil
}

// Push 推送数据
func (que *Queue) Push(data []byte) error {
	que.mutex.Lock()
	defer que.mutex.Unlock()

	ch, err := que.conn.Channel()
	if err != nil {
		log.Println(err)
		if err := que.Connect(); err != nil {
			panic(err)
		}
	}
	return ch.Publish(que.exchange, que.routekey, false, false, amqp.Publishing{
		DeliveryMode: amqp.Persistent,
		Timestamp:    time.Now(),
		ContentType:  que.contentType,
		Body:         data,
	})
}