// Package handler provides HTTP handlers for various endpoints.
package handler

import (
	"fmt"
	"net/http"
	"sync"

	"modelRT/constants"
	"modelRT/logger"
	"modelRT/network"

	"github.com/gin-gonic/gin"
	"github.com/gofrs/uuid"
)

var globalMonitorState *SharedMonitorState

func init() {
	globalMonitorState = NewSharedMonitorState()
}

// RealTimeMonitorHandler define real time data monitor process API
// @Summary 开始或结束实时数据监控
// @Description 根据用户输入的组件token,从 modelRT 服务中开始或结束对于实时数据的监控
// @Tags RealTime Component
// @Accept json
// @Produce json
// @Router /data/realtime [get]
func RealTimeMonitorHandler(c *gin.Context) {
	var request network.RealTimeQueryRequest
	var monitorAction string
	var monitorID string

	if err := c.ShouldBindJSON(&request); err != nil {
		logger.Error(c, "failed to unmarshal real time query request", "error", err)
		c.JSON(http.StatusOK, network.FailureResponse{
			Code: http.StatusBadRequest,
			Msg:  err.Error(),
		})
		return
	}

	if request.Action == constants.MonitorStartAction && request.MonitorID == "" {
		monitorAction = request.Action
		id, err := uuid.NewV4()
		if err != nil {
			logger.Error(c, "failed to generate monitor id", "error", err)
			c.JSON(http.StatusOK, network.FailureResponse{
				Code: http.StatusBadRequest,
				Msg:  err.Error(),
			})
			return
		}
		monitorID = id.String()
	} else if request.Action == constants.MonitorStartAction && request.MonitorID != "" {
		monitorAction = constants.MonitorAppendAction
		monitorID = request.MonitorID
	} else if request.Action == constants.MonitorStopAction && request.MonitorID != "" {
		monitorAction = request.Action
		monitorID = request.MonitorID
	}

	switch monitorAction {
	case constants.MonitorStartAction:
		fmt.Println(monitorID)
		var config RealTimeMonitorConfig
		for _, component := range request.Components {
			fmt.Println(config)
			globalMonitorState.Get(monitorID, component.Interval)
		}
	case constants.MonitorStopAction:
		for _, component := range request.Components {
			fmt.Println(component.Interval)
		}
	case constants.MonitorAppendAction:
		for _, component := range request.Components {
			fmt.Println(component.Interval)
		}
	default:
		err := fmt.Errorf("%w: %s", constants.ErrUnsupportedAction, request.Action)
		logger.Error(c, "unsupported action of real time data monitor request", "error", err)
		c.JSON(http.StatusOK, network.FailureResponse{
			Code: http.StatusBadRequest,
			Msg:  err.Error(),
		})
		return
	}
}

// RealTimeMonitorComponent define struct of real time monitor component
type RealTimeMonitorComponent struct {
	interval string
	targets  []string
}

// RealTimeMonitorConfig define struct of real time monitor config
type RealTimeMonitorConfig struct {
	noticeChan chan struct{}
	components map[string]*RealTimeMonitorComponent
}

// SharedMonitorState define struct of shared monitor state with mutex
type SharedMonitorState struct {
	monitorMap map[string]*RealTimeMonitorConfig
	mutex      sync.RWMutex
}

// NewSharedMonitorState define function to create new SharedMonitorState
func NewSharedMonitorState() *SharedMonitorState {
	return &SharedMonitorState{
		monitorMap: make(map[string]*RealTimeMonitorConfig),
	}
}

// Set defined function to set value in SharedMonitorState
func (s *SharedMonitorState) Set(key string, value *RealTimeMonitorConfig) {
	s.mutex.Lock()
	defer s.mutex.Unlock()
	s.monitorMap[key] = value
}

// Get defined function to get value from SharedMonitorState
func (s *SharedMonitorState) Get(monitorID, interval string) ([]string, bool) {
	s.mutex.RLock()
	defer s.mutex.RUnlock()

	config, ok := s.monitorMap[monitorID]
	if !ok {
		return nil, false
	}

	component, ok := config.components[interval]
	if !ok {
		return nil, false
	}

	return component.targets, true
}