package main

import (
	"context"
	"errors"
	"fmt"
	"log/slog"
	"net/url"
	"time"

	"github.com/eclipse/paho.golang/autopaho"
	"github.com/eclipse/paho.golang/autopaho/extensions/rpc"
	"github.com/eclipse/paho.golang/paho"
	"google.golang.org/protobuf/proto"
	"joylink.club/iot/dto"
	"joylink.club/iot/mqtt"
	"joylink.club/iot/server"
	"joylink.club/iot/service"
	"joylink.club/iot/service/model"
)

// 作为子系统使用方式

func main() {
	go server.StartIotQcServer()

	time.Sleep(2 * time.Second) // 等待mqtt主题初始化
	ac := initAppClient()
	time.Sleep(3 * time.Second) // 等待应用mqtt连接
	for i := 0; i < 4; i++ {
		ac.startIotQcService() // 启动IOT驱采服务
		resp, err := ac.iotLogReq(&dto.IotServiceLogReq{Count: 10})
		if err != nil {
			slog.Error("应用请求日志错误", "err", err)
		} else {
			slog.Info("应用请求日志成功", "resp", resp)
		}
		time.Sleep(10 * time.Second)
		ac.stopIotQcService() // 停止IOT驱采服务
		time.Sleep(5 * time.Second)
	}
	time.Sleep(10 * time.Second)
	ac.disconnect()
}

type AppClient struct {
	cfg  *autopaho.ClientConfig
	cm   *autopaho.ConnectionManager
	task service.IScheduledTask
}

func (app *AppClient) stopIotQcService() {
	resp, err := app.iotStopReq(&dto.IotQcServiceStopReq{})
	if err != nil {
		panic(fmt.Errorf("停止服务请求错误, err: %v", err))
	}
	if resp.Code != 0 {
		panic(fmt.Errorf("停止服务请求响应错误, code: %d, msg: %s", resp.Code, resp.Msg))
	}
	slog.Info("应用停止iot服务成功", "resp", resp)
	app.cfg.Router.UnregisterHandler(mqtt.GetCjTopic())
	app.cfg.Router.UnregisterHandler(mqtt.GetQdTopic())
	t := app.task
	app.task = nil
	if t != nil {
		t.Stop()
	}
}

func (app *AppClient) startIotQcService() {
	modbusCfg := &dto.ModbusConfig{
		Url:      "tcp://127.0.0.1:502",
		UnitId:   2,
		Timeout:  500,
		Interval: 1000,
		Qdl:      2, // 驱动数据字节数
		Cjl:      2, // 采集数据字节数
		Mapping: []*dto.ModbusDcMapping{
			{
				// Function: proto.Modbus_ReadHoldingRegister,
				Function: dto.Modbus_ReadCoil,
				Addr:     0,
				Quantity: 16,
				Type:     dto.DataType_CJ,
				Start:    0,
			},
			{
				Function: dto.Modbus_RWCoils,
				Addr:     16,
				Quantity: 16,
				Type:     dto.DataType_QD,
				Start:    0,
			},
		},
	}
	resp, err := app.iotServiceStartReq(&dto.IotQcServiceStartReq{
		Config: modbusCfg,
	})
	if err != nil {
		panic(fmt.Errorf("启动服务请求错误, err: %v", err))
	}
	if resp.Code != 0 {
		panic(fmt.Errorf("启动服务请求响应错误, code: %d, msg: %s", resp.Code, resp.Msg))
	}
	slog.Info("应用启动iot服务成功", "resp", resp)
	app.RegIotCjDataHandler(func(cj *dto.IotCj) {
		slog.Info("应用收到采集数据", "cj", model.BytesDebug(cj.Data))
	})
	app.RegIotQdDataHandler(func(qd *dto.IotQd) {
		slog.Info("应用收到驱动数据", "qd", model.BytesDebug(qd.Data))
	})

	i := 0
	writeTask := service.NewScheduledTask(func() {
		i++
		idx := i % 8
		err := app.PubIotQdData(&dto.IotQd{Data: []byte{byte(1 << idx), byte(3 << idx)}})
		if err != nil {
			slog.Error("发布写入驱动数据错误", "error", err)
		}
	}, time.Second)
	app.task = writeTask
}

func (app *AppClient) disconnect() {
	slog.Info("断开应用MQTT客户端")
	ctx, cancle := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancle()
	err := app.cm.Disconnect(ctx)
	if err != nil {
		slog.Error("断开MQTT客户端失败", "err", err)
	}
}
func (app *AppClient) newRpcHandler(respTopicFmt string) (*rpc.Handler, error) {
	ctx, cancel := context.WithTimeout(context.Background(), time.Second*3)
	defer cancel()
	h, err := rpc.NewHandler(ctx, rpc.HandlerOpts{
		Conn:             app.cm,
		Router:           app.cfg.Router,
		ResponseTopicFmt: respTopicFmt,
		ClientID:         app.cfg.ClientID,
	})
	if err != nil {
		slog.Error("创建RPC处理器失败", "err", err)
		return nil, err
	}
	return h, nil
}

// 注册IOT服务启动请求处理
func (app *AppClient) iotServiceStartReq(req *dto.IotQcServiceStartReq) (*dto.IotQcServiceCommonResp, error) {
	h, err := app.newRpcHandler("%s/iotstartresp")
	if err != nil {
		return nil, err
	}
	ctx, cancel := context.WithTimeout(context.Background(), time.Second*3)
	defer cancel()
	b, err := proto.Marshal(req)
	if err != nil {
		slog.Error("序列化请求消息失败", "err", err)
		return nil, err
	}
	resp, err := h.Request(ctx, &paho.Publish{
		Topic:   mqtt.GetIotServiceStartTopic(),
		Payload: b,
	})
	if err != nil {
		return nil, errors.Join(fmt.Errorf("发送启动服务请求错误"), err)
	}
	result := &dto.IotQcServiceCommonResp{}
	proto.Unmarshal(resp.Payload, result)
	return result, nil
}

func (app *AppClient) iotStopReq(req *dto.IotQcServiceStopReq) (*dto.IotQcServiceCommonResp, error) {
	h, err := app.newRpcHandler("%s/iotstopresp")
	if err != nil {
		return nil, err
	}
	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
	defer cancel()
	b, err := proto.Marshal(req)
	if err != nil {
		return nil, errors.Join(fmt.Errorf("序列化IOT服务停止请求消息失败"), err)
	}
	resp, err := h.Request(ctx, &paho.Publish{
		Topic:   mqtt.GetIotServiceStopTopic(),
		Payload: b,
	})
	if err != nil {
		return nil, errors.Join(fmt.Errorf("发送停止IOT服务请求错误"), err)
	}
	result := &dto.IotQcServiceCommonResp{}
	proto.Unmarshal(resp.Payload, result)
	return result, nil
}

func (app *AppClient) iotLogReq(req *dto.IotServiceLogReq) (*dto.IotServiceLogResp, error) {
	h, err := app.newRpcHandler("%s/iotlogresp")
	if err != nil {
		return nil, err
	}
	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
	defer cancel()
	b, err := proto.Marshal(req)
	if err != nil {
		return nil, errors.Join(fmt.Errorf("序列化IOT服务日志请求消息失败"), err)
	}
	resp, err := h.Request(ctx, &paho.Publish{
		Topic:   mqtt.GetLogReqTopic(),
		Payload: b,
	})
	if err != nil {
		return nil, errors.Join(fmt.Errorf("发送IOT服务日志请求错误"), err)
	}
	result := &dto.IotServiceLogResp{}
	proto.Unmarshal(resp.Payload, result)
	return result, nil
}
func (app *AppClient) RegIotCjDataHandler(h func(*dto.IotCj)) {
	app.cfg.Router.RegisterHandler(mqtt.GetCjTopic(), func(p *paho.Publish) {
		cj := &dto.IotCj{}
		err := proto.Unmarshal(p.Payload, cj)
		if err != nil {
			slog.Error("采集数据proto.Unmarshal异常", "error", err)
			return
		}
		h(cj)
	})
}

func (app *AppClient) RegIotQdDataHandler(h func(*dto.IotQd)) {
	app.cfg.Router.RegisterHandler(mqtt.GetQdTopic(), func(p *paho.Publish) {
		qd := &dto.IotQd{}
		err := proto.Unmarshal(p.Payload, qd)
		if err != nil {
			slog.Error("驱动数据proto.Unmarshal异常", "error", err)
			return
		}
		h(qd)
	})
}

func (app *AppClient) PubIotCjData(cj *dto.IotCj) error {
	return app.pub(mqtt.GetCjTopic(), cj)
}

func (app *AppClient) PubIotQdData(qd *dto.IotQd) error {
	slog.Warn("应用发布驱动数据", "topic", mqtt.GetQdTopic(), "data", model.BytesDebug(qd.Data))
	return app.pub(mqtt.GetQdTopic(), qd)
}

func (app *AppClient) pub(topic string, data proto.Message) error {
	b, err := proto.Marshal(data)
	if err != nil {
		return err
	}
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	_, err = app.cm.Publish(ctx, &paho.Publish{
		Topic:   topic,
		Payload: b,
	})
	return err
}

func initAppClient() *AppClient {
	clientId := "iotstartreq_test"
	topics := []string{mqtt.GetIotServiceStateTopic(), mqtt.GetCjTopic(), mqtt.GetQdTopic()}
	cfg := getCmConfig(clientId, topics)

	// ctx, cancel := context.WithCancel(context.Background())
	// defer cancel()
	cm, err := autopaho.NewConnection(context.Background(), cfg)
	if err != nil {
		panic(err)
	}
	ac := &AppClient{cfg: &cfg, cm: cm}
	return ac
}

func getCmConfig(clientId string, subTopics []string) autopaho.ClientConfig {
	addr, _ := url.Parse("tcp://192.168.3.233:1883")
	cc := autopaho.ClientConfig{
		BrokerUrls: []*url.URL{addr},
		KeepAlive:  60,
		OnConnectionUp: func(cm *autopaho.ConnectionManager, connAck *paho.Connack) {
			fmt.Println("mqtt connection up")
			ctx, cancel := context.WithTimeout(context.Background(), time.Duration(5*time.Second))
			defer cancel()
			for _, v := range subTopics {
				if _, err := cm.Subscribe(ctx, &paho.Subscribe{
					Subscriptions: []paho.SubscribeOptions{
						{Topic: v, QoS: 0, NoLocal: true},
					},
				}); err != nil {
					fmt.Printf("failed to subscribe (%s). This is likely to mean no messages will be received.", err)
					return
				}
			}
			fmt.Println("mqtt subscription made")
		},
		OnConnectError: func(err error) { fmt.Printf("error whilst attempting connection: %s\n", err) },
		ClientConfig: paho.ClientConfig{
			ClientID:      clientId,
			Router:        paho.NewStandardRouter(),
			OnClientError: func(err error) { fmt.Printf("%s 客户端错误: %s\n", clientId, err) },
			OnServerDisconnect: func(d *paho.Disconnect) {
				if d.Properties != nil {
					fmt.Printf("%s 服务断联: %v\n", clientId, d)
				} else {
					fmt.Printf("%s 服务断联; reason code: %d\n", clientId, d.ReasonCode)
				}
			},
		},
	}
	cc.SetUsernamePassword("rtsts_service", []byte("joylink@0503"))
	return cc
}