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"
)

// Specific guide about a specific event.
//
//	@Summary		Get Event Guide
//	@Description	Fetching attendance guide of an event using its UUID.
//	@Tags			Event
//	@Accept			json
//	@Produce		json
//	@Security		Bearer
//	@Param			event_id	query		string															true	"Event UUID"
//	@Success		200			{object}	utils.RespStatus{data=service_event.AttendanceGuideResponse}	"Successful retrieval"
//	@Failure		400			{object}	utils.RespStatus{data=nil}										"Invalid Input"
//	@Failure		401			{object}	utils.RespStatus{data=nil}										"Missing User ID / Unauthorized"
//	@Failure		404			{object}	utils.RespStatus{data=nil}										"Event Not Found"
//	@Failure		500			{object}	utils.RespStatus{data=nil}										"Internal Server Error"
//	@Router			/event/guide [get]
func (self *EventHandler) Guide(c *gin.Context) {
	ctx, span := tracer.StartSpan(
		c.Request.Context(),
		"api_event",
		"guide",
	)
	defer span.End()

	ctx = exception.ContextWithEndpoint(ctx, exception.EndpointEventAttendanceGuide)
	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
	}

	eventIdOrig := c.Query("event_id")
	eventId, err := uuid.Parse(eventIdOrig)
	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.GetAttendanceGuide(&service_event.AttendanceGuidePayload{
		Context: ctx,
		UserId:  userId,
		Data: &service_event.AttendanceGuideData{
			EventId: eventId,
		},
	})

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

	utils.HttpResponse(c, 200, result.Common.Exception.String(), result.Data)
}