package mqtt

import (
	"fmt"
	"log/slog"
	"math/rand"
	"net/url"
	"time"

	"github.com/eclipse/paho.golang/autopaho"
	"github.com/eclipse/paho.golang/paho"
	"github.com/google/uuid"
	"joylink.club/bj-rtsts-server/config"
)

type MqttOptions struct {
	AppId             string // 所属应用编号
	BrokerUrl         string // Broker地址
	ClientId          string // 客户端ID
	Username          string // 用户名
	Password          string // 密码
	KeepAlive         uint16 // 保活时间间隔,单位s,默认为60
	ConnectRetryDelay uint16 // 连接重试延时,单位s,默认为3
	ConnectTimeout    uint16 // 连接操作超时,单位s,默认为3
	route             *paho.StandardRouter
}

func NewMqttOptions(address, username, password string) *MqttOptions {
	return &MqttOptions{
		AppId:     config.SystemName,
		BrokerUrl: address,
		Username:  username,
		Password:  password,
		ClientId: (func() string { // 初始化MQTT客户端id
			us := uuid.New().String()
			usl := len(us)
			sufix5 := us[usl-5 : usl]
			return fmt.Sprintf("%s%d", sufix5, rand.New(rand.NewSource(time.Now().UnixNano())).Int()%1000)
		})(),
	}
}

func (c *MqttOptions) tryInto() (*autopaho.ClientConfig, error) {
	addr, err := url.Parse(c.BrokerUrl)
	if err != nil {
		return nil, fmt.Errorf("Mqtt.Address格式错误, %s: %w", c.BrokerUrl, err)
	}
	if c.KeepAlive == 0 {
		c.KeepAlive = 60
	}
	if c.ConnectRetryDelay == 0 {
		c.ConnectRetryDelay = 3
	}
	if c.ConnectTimeout == 0 {
		c.ConnectTimeout = 3
	}
	router := paho.NewStandardRouter()
	cc := &autopaho.ClientConfig{
		BrokerUrls: []*url.URL{
			addr,
		},
		KeepAlive:         c.KeepAlive,
		ConnectRetryDelay: time.Duration(c.ConnectRetryDelay) * time.Second,
		ConnectTimeout:    time.Duration(c.ConnectTimeout) * time.Second,
		OnConnectionUp: func(*autopaho.ConnectionManager, *paho.Connack) {
			slog.Info("MQTT连接成功")
		},
		OnConnectError: func(err error) {
			slog.Error("MQTT连接失败", "error", err)
		},
		ClientConfig: paho.ClientConfig{
			ClientID:      c.ClientId,
			Router:        paho.NewStandardRouter(),
			OnClientError: func(err error) { fmt.Printf("%s Mqtt客户端发生错误: %s\n", c.ClientId, err) },
			OnServerDisconnect: func(d *paho.Disconnect) {
				fmt.Printf("%s 连接断开; reason code: %d,properties: %v\n", c.ClientId, d.ReasonCode, d.Properties)
			},
			//添加订阅路由功能，以支持订阅
			OnPublishReceived: []func(paho.PublishReceived) (bool, error){
				func(pr paho.PublishReceived) (bool, error) {
					router.Route(pr.Packet.Packet())
					return true, nil // we assume that the router handles all messages (todo: amend router API)
				}},
		},
	}
	cc.SetUsernamePassword(c.Username, []byte(c.Password))
	c.route = router
	return cc, nil
}