package event

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

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

// Join handles the request for a user to join a specific event.
//
//	@Summary		Join an Event
//	@Description	Allows an authenticated user to join an event by providing the event ID. The user's role and state are initialized by the service.
//	@Tags			Event
//	@Accept			json
//	@Produce		json
//	@Param			request	body		service_event.EventJoinData								true	"Event Join Details (UserId and EventId are required)"
//	@Success		200		{object}	utils.RespStatus{data=service_event.EventJoinResponse}	"Successfully joined the event"
//	@Failure		400		{object}	utils.RespStatus{data=nil}								"Invalid Input or UUID Parse Failed"
//	@Failure		401		{object}	utils.RespStatus{data=nil}								"Missing User ID / Unauthorized"
//	@Failure		403		{object}	utils.RespStatus{data=nil}								"Unauthorized / Missing User ID / Event Limit Exceeded"
//	@Failure		500		{object}	utils.RespStatus{data=nil}								"Internal Server Error / Database Error"
//	@Security		ApiKeyAuth
//	@Router			/event/join [post]
func (self *EventHandler) Join(c *gin.Context) {
	userIdOrig, ok := c.Get("user_id")
	if !ok {
		errorCode := new(exception.Builder).
			SetStatus(exception.StatusUser).
			SetService(exception.ServiceEvent).
			SetEndpoint(exception.EndpointEventServiceJoin).
			SetType(exception.TypeCommon).
			SetOriginal(exception.CommonErrorMissingUserId).
			Throw(c).
			String()
		utils.HttpResponse(c, 403, errorCode)
		return
	}

	var joinData service_event.EventJoinData
	if err := c.ShouldBindJSON(&joinData); err != nil {
		errorCode := new(exception.Builder).
			SetStatus(exception.StatusUser).
			SetService(exception.ServiceEvent).
			SetEndpoint(exception.EndpointEventServiceJoin).
			SetType(exception.TypeCommon).
			SetOriginal(exception.CommonErrorInvalidInput).
			SetError(err).
			Throw(c).
			String()
		utils.HttpResponse(c, 400, errorCode)
		return
	}

	joinData.UserId = userIdOrig.(string)

	payload := &service_event.EventJoinPayload{
		Context: c,
		Data:    &joinData,
	}

	result := self.svc.JoinEvent(payload)

	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())
}