cms-server/service/service_event/list_events.go

package service_event

import (
	"context"
	"nixcn-cms/data"
	"nixcn-cms/internal/exception"
	"nixcn-cms/service/shared"
	"strconv"

	"github.com/google/uuid"
)

type EventListData struct {
	Limit  *string `json:"limit"`
	Offset *string `json:"offset"`
}

type EventListPayload struct {
	Context context.Context
	UserId  uuid.UUID
	Data    *EventListData
}

type EventListResult struct {
	Common shared.CommonResult
	Data   *[]data.EventIndexDoc `json:"event_list"`
}

func (self *EventServiceImpl) ListEvents(payload *EventListPayload) (result *EventListResult) {
	var limit string
	if payload.Data.Limit == nil || *payload.Data.Limit == "" {
		limit = "20"
	} else {
		limit = *payload.Data.Limit
	}

	var offset string
	if payload.Data.Offset == nil || *payload.Data.Offset == "" {
		exception := new(exception.Builder).
			SetStatus(exception.StatusUser).
			SetService(exception.ServiceEvent).
			SetEndpoint(exception.EndpointEventServiceList).
			SetType(exception.TypeCommon).
			SetOriginal(exception.CommonErrorInvalidInput).
			SetError(nil).
			Throw(payload.Context)

		return &EventListResult{
			Common: shared.CommonResult{
				HttpCode:  400,
				Exception: exception,
			},
			Data: nil,
		}
	} else {
		offset = *payload.Data.Offset
	}

	limitNum, err := strconv.Atoi(limit)
	if err != nil {
		exc := new(exception.Builder).
			SetStatus(exception.StatusUser).
			SetService(exception.ServiceEvent).
			SetEndpoint(exception.EndpointEventServiceList).
			SetType(exception.TypeCommon).
			SetOriginal(exception.CommonErrorInvalidInput).
			SetError(err).
			Throw(payload.Context)

		return &EventListResult{
			Common: shared.CommonResult{
				HttpCode:  400,
				Exception: exc,
			},
			Data: nil,
		}
	}

	offsetNum, err := strconv.Atoi(offset)
	if err != nil {
		exc := new(exception.Builder).
			SetStatus(exception.StatusUser).
			SetService(exception.ServiceEvent).
			SetEndpoint(exception.EndpointEventServiceList).
			SetType(exception.TypeCommon).
			SetOriginal(exception.CommonErrorInvalidInput).
			SetError(err).
			Throw(payload.Context)

		return &EventListResult{
			Common: shared.CommonResult{
				HttpCode:  400,
				Exception: exc,
			},
			Data: nil,
		}
	}

	eventList, err := new(data.Event).
		FastListEvents(payload.Context, int64(limitNum), int64(offsetNum))
	if err != nil {
		exc := new(exception.Builder).
			SetStatus(exception.StatusServer).
			SetService(exception.ServiceEvent).
			SetEndpoint(exception.EndpointEventServiceList).
			SetType(exception.TypeSpecific).
			SetOriginal(exception.EventListDatabaseFailed).
			SetError(err).
			Throw(payload.Context)

		return &EventListResult{
			Common: shared.CommonResult{
				HttpCode:  500,
				Exception: exc,
			},
			Data: nil,
		}
	}

	if eventList != nil && len(*eventList) > 0 {
		var eventIds []uuid.UUID
		for _, e := range *eventList {
			parsedId, parseErr := uuid.Parse(e.EventId)
			if parseErr == nil {
				eventIds = append(eventIds, parsedId)
			}
		}

		joinedMap, err := new(data.Attendance).GetJoinedEventIDs(payload.Context, payload.UserId, eventIds)

		if err != nil {
			exc := new(exception.Builder).
				SetStatus(exception.StatusServer).
				SetService(exception.ServiceEvent).
				SetEndpoint(exception.EndpointEventServiceList).
				SetType(exception.TypeCommon).
				SetOriginal(exception.CommonErrorDatabase).
				SetError(err).
				Throw(payload.Context)

			return &EventListResult{
				Common: shared.CommonResult{
					HttpCode:  500,
					Exception: exc,
				},
				Data: nil,
			}
		}

		for i := range *eventList {
			currentIdStr := (*eventList)[i].EventId
			currentIdUuid, _ := uuid.Parse(currentIdStr)

			(*eventList)[i].IsJoined = joinedMap[currentIdUuid]
		}
	}

	successExc := new(exception.Builder).
		SetStatus(exception.StatusSuccess).
		SetService(exception.ServiceEvent).
		SetEndpoint(exception.EndpointEventServiceList).
		SetType(exception.TypeCommon).
		SetOriginal(exception.CommonSuccess).
		SetError(nil).
		Throw(payload.Context)

	result = &EventListResult{
		Common: shared.CommonResult{
			HttpCode:  200,
			Exception: successExc,
		},
		Data: eventList,
	}

	return
}