package event

import (
	"errors"
	"nixcn-cms/internal/exception"
	"nixcn-cms/service/service_event"
	"nixcn-cms/tracer"
	"nixcn-cms/utils"

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

// Stats returns aggregate statistics for an event.
//
//	@Summary		Get Event Statistics
//	@Description	Returns join count, checkin count, KYC pass rate, and agenda submission count. Only accessible by the event owner (Manager).
//	@Tags			Event
//	@Produce		json
//	@Security		Bearer
//	@Param			event_id	query		string													true	"Event UUID"
//	@Success		200			{object}	utils.RespStatus{data=service_event.EventStatsResponse}	"Statistics retrieved successfully"
//	@Failure		400			{object}	utils.RespStatus{data=nil}								"Invalid Input"
//	@Failure		401			{object}	utils.RespStatus{data=nil}								"Unauthorized"
//	@Failure		403			{object}	utils.RespStatus{data=nil}								"Not Event Owner"
//	@Failure		404			{object}	utils.RespStatus{data=nil}								"Event Not Found"
//	@Failure		500			{object}	utils.RespStatus{data=nil}								"Internal Server Error"
//	@Router			/event/stats [get]
func (self *EventHandler) Stats(c *gin.Context) {
	ctx, span := tracer.StartSpan(
		c.Request.Context(),
		"api_event",
		"stats",
	)
	defer span.End()

	ctx = exception.ContextWithEndpoint(ctx, exception.EndpointEventStats)
	ctx = exception.ContextWithService(ctx, exception.ServiceEndpoint)

	userIdOrig, ok := c.Get("user_id")
	if !ok {
		errorCode := exception.New(
			exception.WithStatus(exception.StatusUser),
			exception.WithType(exception.TypeCommon),
			exception.WithOriginal(exception.CommonErrorMissingUserId),
			exception.WithError(errors.New("Missing UserId")),
		).Throw(ctx).String()
		utils.HttpResponse(c, 403, errorCode)
		return
	}

	userId, err := uuid.Parse(userIdOrig.(string))
	if err != nil {
		errorCode := exception.New(
			exception.WithStatus(exception.StatusServer),
			exception.WithType(exception.TypeCommon),
			exception.WithOriginal(exception.CommonErrorUuidParseFailed),
			exception.WithError(err),
		).Throw(ctx).String()
		utils.HttpResponse(c, 500, errorCode)
		return
	}

	result := self.svc.Stats(&service_event.EventStatsPayload{
		Context: ctx,
		UserId:  userId,
		Data: &service_event.EventStatsData{
			EventId: c.Query("event_id"),
		},
	})

	if result.Common.Exception.Original != exception.CommonSuccess {
		utils.HttpResponse(c, result.Common.HttpCode, result.Common.Exception.String())
		return
	}

	utils.HttpResponse(c, result.Common.HttpCode, result.Common.Exception.String(), result.Data)
}