// Package handler define HTTP handler functions for eventRT service
package handler

import (
	"errors"
	"eventRT/constants"
	"eventRT/event"
	"eventRT/logger"
	"net/http"
	"regexp"

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

func PostAlarmHandler(c *gin.Context) {
	ctx := c.Request.Context()

	record, err := checkAndGenPostAlarmParam(c)
	if err != nil {
		logger.Error(ctx, "check and gen param failed", "error", err)
		c.JSON(http.StatusBadRequest, gin.H{
			"code": 1,
			"msg":  "check and gen param failed",
		})
		return
	}

	if err := event.PersistAndPublishEvent(ctx, record); err != nil {
		logger.Error(ctx, "persist and publish event failed", "error", err)
		c.JSON(http.StatusInternalServerError, gin.H{
			"code": 2,
			"msg":  "persist and publish event failed",
		})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"code": 0,
		"msg":  "success",
	})
}

func checkAndGenPostAlarmParam(c *gin.Context) (*event.EventRecord, error) {
	a := new(alarm)
	if err := c.ShouldBindJSON(a); err != nil {
		return nil, err
	}

	ok, err := regexp.MatchString(`ssu\d{3}`, a.DeviceNo)
	if err != nil {
		return nil, err
	}
	if !ok {
		return nil, errors.New("invalid device_no")
	}

	if a.AlarmCode < 1 || a.AlarmCode > 10 {
		return nil, errors.New("invalid alarm_code")
	}

	if a.AlarmStatus < 0 || a.AlarmStatus > 1 {
		return nil, errors.New("invalid alarm_status")
	}

	event, err := a.ConvertToEvent(c.RemoteIP()) // TODO
	if err != nil {
		return nil, err
	}

	return event, nil
}

var almCode2Name = []string{
	0:  "", // 占位
	1:  "通信异常",
	2:  "AD故障",
	3:  "同步秒脉冲异常",
	4:  "备用",
	5:  "单元初始化",
	6:  "读参数错",
	7:  "备用",
	8:  "启动采样-内部转换信号",
	9:  "秒内采样点数过量",
	10: "秒内采样点数欠量",
}

type alarm struct {
	DriverName  string `bson:"driver_name" json:"driver_name"`
	DeviceNo    string `bson:"device_no" json:"device_no"`
	AlarmCode   int    `bson:"alarm_code" json:"alarm_code"`
	AlarmTime   int64  `bson:"alarm_time" json:"alarm_time"`
	AlarmStatus int    `bson:"alarm_status" json:"alarm_status"`
}

func (a *alarm) ConvertToEvent(op string) (*event.EventRecord, error) {
	e := new(event.EventRecord)
	uid, err := uuid.NewV4()
	if err != nil {
		return nil, err
	}

	if a != nil {
		e.EventName = almCode2Name[a.AlarmCode]
		e.EventUUID = uid.String()
		e.Type = a.GetType()
		e.Priority = a.GetPriority()
		e.Status = constants.EventStatusHappened
		e.Timestamp = a.AlarmTime
		e.From = "station"
		e.Operations = append(e.Operations, event.OperationRecord{
			Action: "happen",
			Op:     op,
			TS:     a.AlarmTime,
		})
		e.Origin = map[string]any{
			"driver_name":  a.DriverName,
			"device_no":    a.DeviceNo,
			"alarm_code":   a.AlarmCode,
			"alarm_time":   a.AlarmTime,
			"alarm_status": a.AlarmStatus,
		}
	}

	return e, nil
}

func (a *alarm) GetType() int {
	switch a.AlarmCode {
	case 4, 5, 7, 8:
		return 0

	case 9, 10:
		return 3

	case 1, 2, 3, 6:
		return 6
	}

	return -1
}

func (a *alarm) GetPriority() int {
	switch a.AlarmCode {
	case 4, 5, 7, 8:
		return 1

	case 9, 10:
		return 4

	case 1, 2, 3, 6:
		return 7
	}

	return -1
}