package rabbitmq

import (
	"context"
	"errors"
	"fmt"
	"os"
	"time"

	"github.com/streadway/amqp"
)

var p *Producer

type Producer struct {
	ctx         context.Context
	msgIDPrefix string
	exchange    *Exchange
	ch          *amqp.Channel
	conn        *Conn
	logger      Logger
	queue       *Queue
}

func Publish(data string) error {
	conn, err := New(context.Background(), Broker{
		Ssl:       false,                          // bool
		Username:  os.Getenv("RABBITMQ_USER"),     // string
		Password:  os.Getenv("RABBITMQ_PASSWORD"), // string
		Server:    os.Getenv("RABBITMQ_HOST"),     // string
		Port:      os.Getenv("RABBITMQ_PORT"),     // string
		Vhost:     os.Getenv("RABBITMQ_VHOST"),    // string
		TSL:       nil,                            // *tls.Config
		ProxyAddr: "",                             // string
		Beatime:   15 * time.Second,               // time.Duration
	})
	if err != nil {
		panic(err)
	}
	var exchange *Exchange
	var queue *Queue
	if os.Getenv("RABBITMQ_PDF_BUILDER_QUEUE") != "" {
		queue = &Queue{
			Name:       os.Getenv("RABBITMQ_PDF_BUILDER_QUEUE"),
			Durable:    true,
			AutoDelete: true,
		}
	}
	if exchange != nil || queue != nil {
		_, err = conn.Producer(exchange, queue)
		if err != nil {
			panic(err)
		}
	}

	if p == nil {
		return errors.New("nil producer")
	}
	// 关闭连接
	defer conn.conn.Close()
	return p.Publish(amqp.Publishing{
		ContentType:  "text/plain",
		DeliveryMode: amqp.Persistent,
		Body:         []byte(data),
	})
}

func PublishExchange(data string) error {
	if p == nil {
		return errors.New("nil producer")
	}
	return p.PublishExchange(amqp.Publishing{
		ContentType:  "text/plain",
		DeliveryMode: amqp.Persistent,
		Body:         []byte(data),
	})
}

func (p *Producer) Conn() *Conn {
	return p.conn
}

func (p *Producer) Publish(msg amqp.Publishing) error {
	msg.MessageId = fmt.Sprintf("%s:%d", p.msgIDPrefix, p.conn.MsgId())
	return p.ch.Publish(
		"",
		p.queue.Name, // routing key
		false,        // mandatory
		false,        // immediate
		msg,
	)
}

func (p *Producer) PublishExchange(msg amqp.Publishing) error {
	msg.MessageId = fmt.Sprintf("%s:%d", p.msgIDPrefix, p.conn.MsgId())
	return p.ch.Publish(
		p.exchange.Name, // exchange
		p.exchange.Key,  // routing key
		false,           // mandatory
		false,           // immediate
		msg,
	)
}