package api

import (
	"datart/data/mongo"
	"datart/log"
	"errors"
	"fmt"
	"strconv"
	"strings"

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
	"go.mongodb.org/mongo-driver/v2/bson"
)

const (
	pageSizeLimit = 500
)

func (a *Api) GetEvents(ctx *gin.Context) {
	filter, sort, pageNo, pageSize, err := a.checkAndGenGetEventsRequest(ctx)
	if err != nil {

		log.Error(err)

		ctx.JSON(200, gin.H{
			"code": 1,
			"msg":  err.Error(),
		})
		return
	}

	events, err := mongo.FindEventsWithPageLimit(ctx.Request.Context(), filter, sort, pageNo, pageSize)
	if err != nil {

		log.Error(err, fmt.Sprintf(" params: %v, %d, %d, %d", filter, sort, pageNo, pageSize))

		ctx.JSON(200, gin.H{
			"code": 2,
			"msg":  err.Error(),
		})
		return
	}

	ctx.JSON(200, gin.H{
		"code": 0,
		"msg":  "success",
		"data": events,
	})
}

func (a *Api) PostUpsertEvents(ctx *gin.Context) {
	noUUID, eventUUID, upsert, err := a.checkAndGenUpsertEventsRequest(ctx)
	if err != nil {
		log.Error(err)
		ctx.JSON(200, gin.H{
			"code": 1,
			"msg":  err.Error(),
		})
		return
	}

	if noUUID {
		if err = mongo.InsertOneEvent(ctx.Request.Context(), upsert); err != nil {

			log.Error(err, fmt.Sprintf(" params: %v", upsert))

			ctx.JSON(200, gin.H{
				"code": 2,
				"msg":  err.Error(),
			})
			return
		}
	} else if err = mongo.UpsertOneEvent(ctx.Request.Context(), bson.M{"event_uuid": eventUUID},
		bson.M{"$set": bson.M(upsert)}); err != nil {

		log.Error(err, fmt.Sprintf(" params: %v", upsert))

		ctx.JSON(200, gin.H{
			"code": 3,
			"msg":  err.Error(),
		})
		return
	}

	ctx.JSON(200, gin.H{
		"code": 0,
		"msg":  "success",
	})
}

func (a *Api) checkAndGenGetEventsRequest(ctx *gin.Context) (bson.M, int, int64, int64, error) {
	uuidStr := ctx.Query("uuid")
	if len(uuidStr) > 0 {

		if uuid.Validate(uuidStr) != nil {
			return nil, 0, -1, -1, errors.New("invalid uuid")
		}

		return bson.M{"event_uuid": uuidStr}, 0, -1, -1, nil
	}

	filter := bson.M{}

	var err error
	begin, end := int64(-1), int64(-1)
	beginStr := ctx.Query("begin")
	if len(beginStr) > 0 {
		if begin, err = strconv.ParseInt(beginStr, 10, 64); err != nil {
			return nil, 0, -1, -1, err
		}
	}

	endStr := ctx.Query("end")
	if len(endStr) > 0 {
		if end, err = strconv.ParseInt(endStr, 10, 64); err != nil {
			return nil, 0, -1, -1, err
		}
	}

	if begin > 0 && end > 0 && begin > end {
		return nil, 0, -1, -1, errors.New("invalid time")
	}

	switch {
	case begin > 0 && end < 0:
		filter["timestamp"] = bson.M{"$gte": begin}
	case begin < 0 && end > 0:
		filter["timestamp"] = bson.M{"$lte": end}
	case begin > 0 && end > 0:
		filter["timestamp"] = bson.M{"$gte": begin, "$lte": end}
	}

	statusStr := ctx.Query("status")
	if len(statusStr) > 0 {
		statusStrs := strings.Split(statusStr, ",")
		statuss := make([]int, len(statusStrs))
		for i := range statusStrs {
			s, err := strconv.Atoi(statusStrs[i])
			if err != nil {
				return nil, 0, -1, -1, errors.New("invalid status")
			}
			statuss[i] = s
		}
		filter["status"] = bson.M{"$in": statuss}
	}

	var sort int
	sortStr := ctx.Query("sort")
	if len(sortStr) > 0 {
		s, err := strconv.Atoi(sortStr)
		if err != nil {
			return nil, 0, -1, -1, err
		}

		if s != 1 && s != -1 {
			return nil, 0, -1, -1, errors.New("invalid sort")
		}
		sort = s
	}

	pageNo, pageSize := -1, -1
	pageNoStr := ctx.Query("page_no")
	pageSizeStr := ctx.Query("page_size")
	if len(pageNoStr) > 0 && len(pageSizeStr) > 0 {
		pageNo, err = strconv.Atoi(pageNoStr)
		if err != nil {
			return nil, 0, -1, -1, err
		}

		pageSize, err = strconv.Atoi(pageSizeStr)
		if err != nil {
			return nil, 0, -1, -1, err
		}

		if pageNo <= 0 || pageSize <= 0 {
			return nil, 0, -1, -1, errors.New("invalid page param")
		}

		if pageSize > pageSizeLimit {
			pageSize = pageSizeLimit
		}
	}

	return filter, sort, int64(pageNo), int64(pageSize), nil
}

func (a *Api) checkAndGenUpsertEventsRequest(ctx *gin.Context) (bool, string, map[string]any, error) {
	e := map[string]any{}
	err := ctx.ShouldBindJSON(&e)
	if err != nil {
		return false, "", nil, errors.New("invalid body param")
	}

	eventUUID := ""
	noUUID := true
	if eu, ok := e["event_uuid"]; ok {
		if eUUID, ok := eu.(string); ok {
			if uuid.Validate(eUUID) == nil {
				eventUUID = eUUID
				noUUID = false
			}
		}
	}

	if noUUID {
		noUUID = true
		if uid, err := uuid.NewV7(); err != nil {
			return false, "", nil, err
		} else {
			eventUUID = uid.String()
			e["event_uuid"] = eventUUID
		}
	}

	return noUUID, eventUUID, e, nil
}