package devices

import (
	"encoding/json"
	"fmt"
	"math/rand"
	"time"

	"iot-base-station/pkg/mqtt"
)

// TemperatureSensor 温度传感器模拟器
type TemperatureSensor struct {
	ID          string
	Name        string
	Location    string
	MinTemp     float64
	MaxTemp     float64
	Interval    time.Duration
	client      mqtt.Client
	topic       string
	running     bool
	stopChan    chan bool
}

// TemperatureData 温度数据
type TemperatureData struct {
	DeviceID    string    `json:"device_id"`
	Temperature float64   `json:"temperature"`
	Humidity    float64   `json:"humidity"`
	Timestamp   time.Time `json:"timestamp"`
	Location    string    `json:"location"`
	Status      string    `json:"status"`
}

// NewTemperatureSensor 创建温度传感器模拟器
func NewTemperatureSensor(id, name, location string, minTemp, maxTemp float64, interval time.Duration) *TemperatureSensor {
	return &TemperatureSensor{
		ID:       id,
		Name:     name,
		Location: location,
		MinTemp:  minTemp,
		MaxTemp:  maxTemp,
		Interval: interval,
		topic:    fmt.Sprintf("iot/data/%s/temperature", id),
		stopChan: make(chan bool),
	}
}

// Connect 连接到MQTT代理
func (s *TemperatureSensor) Connect(broker string) error {
	// 创建MQTT客户端
	opts := mqtt.NewClientOptions()
	opts.AddBroker(broker)
	opts.SetClientID(s.ID)
	opts.SetCleanSession(true)

	// 连接MQTT代理
	client := mqtt.NewClient(opts)
	if token := client.Connect(); token.Wait() && token.Error() != nil {
		return fmt.Errorf("failed to connect to MQTT broker: %w", token.Error())
	}

	s.client = client
	return nil
}

// Start 启动传感器
func (s *TemperatureSensor) Start() {
	if s.running {
		return
	}

	s.running = true
	go s.run()
}

// Stop 停止传感器
func (s *TemperatureSensor) Stop() {
	if !s.running {
		return
	}

	s.running = false
	s.stopChan <- true
}

// run 运行传感器
func (s *TemperatureSensor) run() {
	ticker := time.NewTicker(s.Interval)
	defer ticker.Stop()

	// 发送初始状态
	s.sendStatus("online")

	for {
		select {
		case <-ticker.C:
			// 生成随机温度数据
			temp := s.MinTemp + rand.Float64()*(s.MaxTemp-s.MinTemp)
			humidity := 30.0 + rand.Float64()*40.0 // 30-70%湿度

			// 创建温度数据
			data := TemperatureData{
				DeviceID:    s.ID,
				Temperature: temp,
				Humidity:    humidity,
				Timestamp:   time.Now(),
				Location:    s.Location,
				Status:      "normal",
			}

			// 检查温度是否异常
			if temp > s.MaxTemp*0.9 || temp < s.MinTemp*1.1 {
				data.Status = "warning"
				s.sendAlert(fmt.Sprintf("温度异常: %.2f°C", temp))
			}

			// 发送数据
			s.sendData(data)

		case <-s.stopChan:
			// 发送离线状态
			s.sendStatus("offline")
			return
		}
	}
}

// sendData 发送数据
func (s *TemperatureSensor) sendData(data TemperatureData) {
	if s.client == nil {
		return
	}

	payload, err := json.Marshal(data)
	if err != nil {
		fmt.Printf("Failed to marshal temperature data: %v\n", err)
		return
	}

	if err := s.client.Publish(s.topic, 1, false, payload); err != nil {
		fmt.Printf("Failed to publish temperature data: %v\n", err)
		return
	}

	fmt.Printf("Sent temperature data from %s: %.2f°C\n", s.ID, data.Temperature)
}

// sendStatus 发送状态
func (s *TemperatureSensor) sendStatus(status string) {
	if s.client == nil {
		return
	}

	topic := fmt.Sprintf("iot/status/%s", s.ID)
	payload := map[string]interface{}{
		"status":    status,
		"timestamp": time.Now(),
	}

	data, err := json.Marshal(payload)
	if err != nil {
		fmt.Printf("Failed to marshal status data: %v\n", err)
		return
	}

	if err := s.client.Publish(topic, 1, true, data); err != nil {
		fmt.Printf("Failed to publish status data: %v\n", err)
		return
	}

	fmt.Printf("Sent status from %s: %s\n", s.ID, status)
}

// sendAlert 发送告警
func (s *TemperatureSensor) sendAlert(message string) {
	if s.client == nil {
		return
	}

	topic := fmt.Sprintf("iot/event/%s", s.ID)
	payload := map[string]interface{}{
		"type":      "alert",
		"severity":  "warning",
		"message":   message,
		"timestamp": time.Now(),
	}

	data, err := json.Marshal(payload)
	if err != nil {
		fmt.Printf("Failed to marshal alert data: %v\n", err)
		return
	}

	if err := s.client.Publish(topic, 1, false, data); err != nil {
		fmt.Printf("Failed to publish alert data: %v\n", err)
		return
	}

	fmt.Printf("Sent alert from %s: %s\n", s.ID, message)
}

// Disconnect 断开连接
func (s *TemperatureSensor) Disconnect() {
	if s.client != nil {
		s.client.Disconnect(250)
	}
}