package event

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

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

// List retrieves a paginated list of events from the database.
//
//	@Summary		List Events
//	@Description	Fetches a list of events with support for pagination via limit and offset. Data is retrieved directly from the database for consistency.
//	@Tags			Event
//	@Accept			json
//	@Produce		json
//	@Param			limit	query		int											false	"Maximum number of events to return (default 20)"
//	@Param			offset	query		int											false	"Number of events to skip"
//	@Success		200		{object}	utils.RespStatus{data=[]data.EventIndexDoc}	"Successful paginated list retrieval"
//	@Failure		400		{object}	utils.RespStatus{data=nil}					"Invalid Input (Missing offset or malformed parameters)"
//	@Failure		401		{object}	utils.RespStatus{data=nil}					"Missing User ID / Unauthorized"
//	@Failure		500		{object}	utils.RespStatus{data=nil}					"Internal Server Error (Database query failed)"
//	@Security		ApiKeyAuth
//	@Router			/event/list [get]
func (self *EventHandler) List(c *gin.Context) {
	userIdOrig, ok := c.Get("user_id")
	if !ok {
		errorCode := new(exception.Builder).
			SetStatus(exception.StatusUser).
			SetService(exception.ServiceUser).
			SetEndpoint(exception.EndpointUserServiceInfo).
			SetType(exception.TypeCommon).
			SetOriginal(exception.CommonErrorMissingUserId).
			Throw(c).
			String()
		utils.HttpResponse(c, 403, errorCode)
		return
	}

	userId, err := uuid.Parse(userIdOrig.(string))
	if err != nil {
		errorCode := new(exception.Builder).
			SetStatus(exception.StatusServer).
			SetService(exception.ServiceUser).
			SetEndpoint(exception.EndpointUserServiceInfo).
			SetType(exception.TypeCommon).
			SetOriginal(exception.CommonErrorUuidParseFailed).
			SetError(err).
			Throw(c).
			String()
		utils.HttpResponse(c, 500, errorCode)
		return
	}

	type ListQuery struct {
		Limit  *string `form:"limit"`
		Offset *string `form:"offset"`
	}

	var query ListQuery
	if err := c.ShouldBindQuery(&query); err != nil {
		// Handle binding error (e.g., syntax errors in query string)
		exc := new(exception.Builder).
			SetStatus(exception.StatusClient).
			SetService(exception.ServiceEvent).
			SetEndpoint(exception.EndpointEventServiceList).
			SetType(exception.TypeCommon).
			SetOriginal(exception.CommonErrorInvalidInput).
			Throw(c).
			String()

		utils.HttpResponse(c, 400, exc)
		return
	}

	// Prepare payload for the service layer
	eventListPayload := &service_event.EventListPayload{
		Context: c,
		UserId:  userId,
		Data: &service_event.EventListData{
			Limit:  query.Limit,
			Offset: query.Offset,
		},
	}

	// Call the service implementation
	result := self.svc.ListEvents(eventListPayload)

	// Check if the service returned any exception
	if result.Common.Exception.Original != exception.CommonSuccess {
		utils.HttpResponse(c, result.Common.HttpCode, result.Common.Exception.String())
		return
	}

	// Return successful response with event data
	utils.HttpResponse(c, result.Common.HttpCode, result.Common.Exception.String(), result.Data)
}