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import {
EventDetail,
EventDetailApprovedParticipant,
EventDetailPendingJoinRequest,
EventHostContextSummary,
ParticipationStatus,
} from '@/models/event';
import {
getEventDetail,
getEventHostContextSummary,
joinEvent,
leaveEvent,
requestJoinEvent,
listEventApprovedParticipants,
listEventPendingJoinRequests,
approveJoinRequest,
rejectJoinRequest,
cancelEvent,
upsertEventRating,
upsertParticipantRating,
} from '@/services/eventService';
import { addFavorite, removeFavorite } from '@/services/favoriteService';
import { useAuth } from '@/contexts/AuthContext';
import { ApiError } from '@/services/api';
export type ActionState =
| 'idle'
| 'joining'
| 'leaving'
| 'requesting'
| 'saving'
| 'success_joined'
| 'success_left'
| 'success_requested'
| 'success_saved';
export interface EventDetailViewModel {
event: EventDetail | null;
hostContextSummary: EventHostContextSummary | null;
approvedParticipants: EventDetailApprovedParticipant[];
pendingJoinRequests: EventDetailPendingJoinRequest[];
approvedParticipantsLoading: boolean;
pendingJoinRequestsLoading: boolean;
approvedParticipantsHasNext: boolean;
pendingJoinRequestsHasNext: boolean;
isLoading: boolean;
apiError: string | null;
actionError: string | null;
actionState: ActionState;
isFavorited: boolean;
participationStatus: ParticipationStatus | null;
isQuotaFull: boolean;
constraintViolation: string | null;
viewerRatingLoading: boolean;
viewerRatingError: string | null;
participantRatingLoadingId: string | null;
participantRatingError: { participantUserId: string; message: string } | null;
showJoinRequestModal: boolean;
joinRequestMessage: string;
openJoinRequestModal: () => void;
closeJoinRequestModal: () => void;
setJoinRequestMessage: (message: string) => void;
canLeave: boolean;
handleJoin: () => Promise<void>;
handleLeaveEvent: () => Promise<void>;
handleRequestJoin: () => Promise<void>;
handleToggleFavorite: () => Promise<void>;
handleViewerRatingSubmit: (rating: number, message?: string) => Promise<void>;
handleParticipantRatingSubmit: (participantUserId: string, rating: number, message?: string) => Promise<void>;
dismissViewerRatingError: () => void;
dismissParticipantRatingError: () => void;
retry: () => void;
showRequestsModal: boolean;
setShowRequestsModal: (val: boolean) => void;
showAttendeesModal: boolean;
setShowAttendeesModal: (val: boolean) => void;
loadMoreApprovedParticipants: () => Promise<void>;
loadMorePendingJoinRequests: () => Promise<void>;
handleApproveRequest: (joinRequestId: string) => Promise<void>;
handleRejectRequest: (joinRequestId: string) => Promise<void>;
handleCancelEvent: () => Promise<void>;
}
function mapRatingError(err: ApiError, fallback: string): string {
const errorMap: Record<string, string> = {
rating_not_allowed: 'You are not allowed to submit a rating for this event.',
rating_window_closed: 'The 7-day rating window has already closed.',
host_cannot_rate_self: 'Hosts cannot rate themselves.',
};
if (err.code === 'validation_error') {
const ratingMessage = err.details?.rating;
const feedbackMessage = err.details?.message;
return feedbackMessage ?? ratingMessage ?? err.message;
}
return errorMap[err.code] ?? err.message ?? fallback;
}
function computeAgeFromBirthDate(birthDate: string): number {
const birth = new Date(birthDate);
const now = new Date();
let age = now.getFullYear() - birth.getFullYear();
const monthDiff = now.getMonth() - birth.getMonth();
Iif (monthDiff < 0 || (monthDiff === 0 && now.getDate() < birth.getDate())) {
age -= 1;
}
return age;
}
export function resolveConstraintViolation(
event: EventDetail,
userGender?: string | null,
userBirthDate?: string | null,
): string | null {
const violations: string[] = [];
const genderTrim = userGender?.trim() ?? '';
if (
event.preferred_gender != null &&
genderTrim !== '' &&
genderTrim.toUpperCase() !== event.preferred_gender
) {
const label =
event.preferred_gender.charAt(0) + event.preferred_gender.slice(1).toLowerCase();
violations.push(`This event is open to ${label} participants only`);
}
const birthTrim = userBirthDate?.trim() ?? '';
if (event.minimum_age != null && birthTrim !== '') {
const age = computeAgeFromBirthDate(birthTrim);
if (age < event.minimum_age) {
violations.push(`Participants must be ${event.minimum_age}+ years old`);
}
}
return violations.length > 0 ? violations.join(' ยท ') : null;
}
export function useEventDetailViewModel(eventId: string): EventDetailViewModel {
const hostCollectionPageSize = 25;
const { token, user } = useAuth();
const [event, setEvent] = useState<EventDetail | null>(null);
const [hostContextSummary, setHostContextSummary] = useState<EventHostContextSummary | null>(null);
const [approvedParticipants, setApprovedParticipants] = useState<EventDetailApprovedParticipant[]>([]);
const [approvedParticipantsLoading, setApprovedParticipantsLoading] = useState(false);
const [approvedParticipantsNextCursor, setApprovedParticipantsNextCursor] = useState<string | null>(null);
const [approvedParticipantsHasNext, setApprovedParticipantsHasNext] = useState(false);
const [pendingJoinRequests, setPendingJoinRequests] = useState<EventDetailPendingJoinRequest[]>([]);
const [pendingJoinRequestsLoading, setPendingJoinRequestsLoading] = useState(false);
const [pendingJoinRequestsNextCursor, setPendingJoinRequestsNextCursor] = useState<string | null>(null);
const [pendingJoinRequestsHasNext, setPendingJoinRequestsHasNext] = useState(false);
const [isLoading, setIsLoading] = useState(true);
const [apiError, setApiError] = useState<string | null>(null);
const [actionError, setActionError] = useState<string | null>(null);
const [actionState, setActionState] = useState<ActionState>('idle');
const [viewerRatingLoading, setViewerRatingLoading] = useState(false);
const [viewerRatingError, setViewerRatingError] = useState<string | null>(null);
const [participantRatingLoadingId, setParticipantRatingLoadingId] = useState<string | null>(null);
const [participantRatingError, setParticipantRatingError] = useState<{ participantUserId: string; message: string } | null>(null);
const [isFavorited, setIsFavorited] = useState(false);
const [participationStatus, setParticipationStatus] =
useState<ParticipationStatus | null>(null);
const [showJoinRequestModal, setShowJoinRequestModal] = useState(false);
const [joinRequestMessage, setJoinRequestMessage] = useState('');
const [showRequestsModal, setShowRequestsModal] = useState(false);
const [showAttendeesModal, setShowAttendeesModal] = useState(false);
const isQuotaFull =
event?.capacity != null &&
event.approved_participant_count >= event.capacity;
const canLeave = useMemo(() => {
if (!event) return false;
if (event.viewer_context.is_host) return false;
if (participationStatus !== 'JOINED') return false;
if (event.status === 'CANCELED' || event.status === 'COMPLETED') return false;
Eif (event.end_time) {
const now = new Date();
const endTime = new Date(event.end_time);
if (now >= endTime) return false;
}
return true;
}, [event, participationStatus]);
const constraintViolation = useMemo(
() =>
event != null
? resolveConstraintViolation(event, user?.gender, user?.birth_date)
: null,
[event, user?.gender, user?.birth_date],
);
const resetHostManagement = useCallback(() => {
setHostContextSummary(null);
setApprovedParticipants([]);
setApprovedParticipantsNextCursor(null);
setApprovedParticipantsHasNext(false);
setPendingJoinRequests([]);
setPendingJoinRequestsNextCursor(null);
setPendingJoinRequestsHasNext(false);
}, []);
const refreshHostContextSummary = useCallback(async () => {
Iif (!token) return null;
const summary = await getEventHostContextSummary(eventId, token);
setHostContextSummary(summary);
return summary;
}, [eventId, token]);
const refreshApprovedParticipants = useCallback(async (cursor?: string | null, append = false) => {
Iif (!token) return;
setApprovedParticipantsLoading(true);
try {
const response = await listEventApprovedParticipants(eventId, token, {
limit: hostCollectionPageSize,
cursor,
});
setApprovedParticipants((prev) => append ? [...prev, ...response.items] : response.items);
setApprovedParticipantsNextCursor(response.page_info.next_cursor ?? null);
setApprovedParticipantsHasNext(response.page_info.has_next);
} finally {
setApprovedParticipantsLoading(false);
}
}, [eventId, token]);
const refreshPendingJoinRequests = useCallback(async (cursor?: string | null, append = false) => {
Iif (!token) return;
setPendingJoinRequestsLoading(true);
try {
const response = await listEventPendingJoinRequests(eventId, token, {
limit: hostCollectionPageSize,
cursor,
});
setPendingJoinRequests((prev) => append ? [...prev, ...response.items] : response.items);
setPendingJoinRequestsNextCursor(response.page_info.next_cursor ?? null);
setPendingJoinRequestsHasNext(response.page_info.has_next);
} finally {
setPendingJoinRequestsLoading(false);
}
}, [eventId, token]);
const fetchEvent = useCallback(async (silent = false) => {
Iif (!token) {
setApiError('You must be logged in to view this event.');
if (!silent) setIsLoading(false);
return;
}
if (!silent) setIsLoading(true);
setApiError(null);
resetHostManagement();
try {
const data = await getEventDetail(eventId, token);
setEvent(data);
setIsFavorited(data.viewer_context.is_favorited);
setParticipationStatus(data.viewer_context.participation_status);
if (data.viewer_context.is_host) {
void refreshHostContextSummary();
}
} catch {
Eif (!silent) setApiError('Failed to load event details. Please try again.');
} finally {
if (!silent) setIsLoading(false);
}
}, [eventId, token, resetHostManagement, refreshHostContextSummary]);
useEffect(() => {
void fetchEvent();
}, [fetchEvent]);
useEffect(() => {
Eif (!showAttendeesModal || !event?.viewer_context.is_host || approvedParticipants.length > 0) return;
void refreshApprovedParticipants();
}, [approvedParticipants.length, event?.viewer_context.is_host, refreshApprovedParticipants, showAttendeesModal]);
useEffect(() => {
Eif (!showRequestsModal || !event?.viewer_context.is_host || pendingJoinRequests.length > 0) return;
void refreshPendingJoinRequests();
}, [event?.viewer_context.is_host, pendingJoinRequests.length, refreshPendingJoinRequests, showRequestsModal]);
const handleJoin = useCallback(async () => {
Iif (!token || !event) return;
setActionError(null);
setActionState('joining');
try {
await joinEvent(event.id, token);
setActionState('success_joined');
await fetchEvent(true);
} catch (err: unknown) {
setActionState('idle');
if (err && typeof err === 'object' && 'message' in err) {
setActionError((err as { message: string }).message);
} else E{
setActionError('Failed to join the event. Please try again.');
}
}
}, [token, event, fetchEvent]);
const handleLeaveEvent = useCallback(async () => {
Iif (!token || !event) return;
setActionError(null);
setActionState('leaving');
try {
const leftBeforeStart = new Date() < new Date(event.start_time);
await leaveEvent(event.id, token);
setParticipationStatus('LEAVED');
await fetchEvent(true);
// Pre-start leave: backend resets participation, so go back to idle
// to let the join/request button render based on refreshed status.
// Post-start leave: show the "You left" chip.
setActionState(leftBeforeStart ? 'idle' : 'success_left');
} catch (err: unknown) {
setActionState('idle');
if (err && typeof err === 'object' && 'message' in err) {
setActionError((err as { message: string }).message);
} else {
setActionError('Failed to leave the event. Please try again.');
}
}
}, [token, event, fetchEvent]);
const handleRequestJoin = useCallback(async () => {
Iif (!token || !event) return;
setActionError(null);
setActionState('requesting');
try {
await requestJoinEvent(
event.id,
{ message: joinRequestMessage.trim() || null },
token,
);
setEvent((prev) =>
prev
? {
...prev,
viewer_context: {
...prev.viewer_context,
participation_status: 'PENDING',
},
}
: prev,
);
setParticipationStatus('PENDING');
setActionState('success_requested');
setShowJoinRequestModal(false);
setJoinRequestMessage('');
} catch (err: unknown) {
setActionState('idle');
if (err && typeof err === 'object' && 'message' in err) {
setActionError((err as { message: string }).message);
} else E{
setActionError('Failed to send join request. Please try again.');
}
}
}, [token, event, joinRequestMessage]);
const handleToggleFavorite = useCallback(async () => {
Iif (!token || !event) return;
const wasFavorited = isFavorited;
const previousCount = event.favorite_count;
const nextCount = wasFavorited
? Math.max(0, previousCount - 1)
: previousCount + 1;
setIsFavorited(!wasFavorited);
setEvent((prev) =>
prev ? { ...prev, favorite_count: nextCount } : prev,
);
try {
if (wasFavorited) {
await removeFavorite(event.id, token);
} else {
await addFavorite(event.id, token);
}
} catch {
setIsFavorited(wasFavorited);
setEvent((prev) =>
prev ? { ...prev, favorite_count: previousCount } : prev,
);
setActionError('Failed to update favorite. Please try again.');
}
}, [token, event, isFavorited]);
const handleViewerRatingSubmit = useCallback(async (rating: number, message?: string) => {
Iif (!token || !event) return;
setViewerRatingLoading(true);
setViewerRatingError(null);
try {
await upsertEventRating(event.id, { rating, message: message?.trim() || null }, token);
await fetchEvent(true);
} catch (err: unknown) {
if (err instanceof ApiError) {
setViewerRatingError(mapRatingError(err, 'Failed to save your rating. Please try again.'));
} else E{
setViewerRatingError('Failed to save your rating. Please try again.');
}
} finally {
setViewerRatingLoading(false);
}
}, [token, event, fetchEvent]);
const handleParticipantRatingSubmit = useCallback(async (
participantUserId: string,
rating: number,
message?: string,
) => {
Iif (!token || !event) return;
setParticipantRatingLoadingId(participantUserId);
setParticipantRatingError(null);
try {
await upsertParticipantRating(
event.id,
participantUserId,
{ rating, message: message?.trim() || null },
token,
);
await Promise.all([fetchEvent(true), refreshApprovedParticipants(undefined, false)]);
} catch (err: unknown) {
if (err instanceof ApiError) {
setParticipantRatingError({
participantUserId,
message: mapRatingError(err, 'Failed to save the participant rating. Please try again.'),
});
} else E{
setParticipantRatingError({
participantUserId,
message: 'Failed to save the participant rating. Please try again.',
});
}
} finally {
setParticipantRatingLoadingId(null);
}
}, [token, event, fetchEvent, refreshApprovedParticipants]);
const handleApproveRequest = useCallback(
async (joinRequestId: string) => {
Iif (!token || !event) return;
try {
await approveJoinRequest(event.id, joinRequestId, token);
await Promise.all([
fetchEvent(true),
refreshHostContextSummary(),
refreshApprovedParticipants(undefined, false),
refreshPendingJoinRequests(undefined, false),
]);
} catch (err: unknown) {
if (err && typeof err === 'object' && 'message' in err) {
setActionError((err as { message: string }).message);
} else {
setActionError('Failed to approve request.');
}
}
},
[token, event, fetchEvent, refreshApprovedParticipants, refreshHostContextSummary, refreshPendingJoinRequests],
);
const handleRejectRequest = useCallback(
async (joinRequestId: string) => {
Iif (!token || !event) return;
try {
await rejectJoinRequest(event.id, joinRequestId, token);
await Promise.all([
fetchEvent(true),
refreshHostContextSummary(),
refreshPendingJoinRequests(undefined, false),
]);
} catch (err: unknown) {
if (err && typeof err === 'object' && 'message' in err) {
setActionError((err as { message: string }).message);
} else {
setActionError('Failed to reject request.');
}
}
},
[token, event, fetchEvent, refreshHostContextSummary, refreshPendingJoinRequests],
);
const handleCancelEvent = useCallback(async () => {
Iif (!token || !event) return;
try {
await cancelEvent(event.id, token);
await fetchEvent(true);
} catch (err: unknown) {
if (err && typeof err === 'object' && 'message' in err) {
setActionError((err as { message: string }).message);
} else E{
setActionError('Failed to cancel event.');
}
}
}, [token, event, fetchEvent]);
const openJoinRequestModal = useCallback(() => {
setActionError(null);
setShowJoinRequestModal(true);
}, []);
const closeJoinRequestModal = useCallback(() => {
setShowJoinRequestModal(false);
setJoinRequestMessage('');
setActionError(null);
}, []);
const retry = useCallback(() => {
void fetchEvent();
}, [fetchEvent]);
const dismissViewerRatingError = useCallback(() => setViewerRatingError(null), []);
const dismissParticipantRatingError = useCallback(() => setParticipantRatingError(null), []);
const loadMoreApprovedParticipants = useCallback(async () => {
if (!approvedParticipantsHasNext || !approvedParticipantsNextCursor || approvedParticipantsLoading) return;
await refreshApprovedParticipants(approvedParticipantsNextCursor, true);
}, [
approvedParticipantsHasNext,
approvedParticipantsLoading,
approvedParticipantsNextCursor,
refreshApprovedParticipants,
]);
const loadMorePendingJoinRequests = useCallback(async () => {
if (!pendingJoinRequestsHasNext || !pendingJoinRequestsNextCursor || pendingJoinRequestsLoading) return;
await refreshPendingJoinRequests(pendingJoinRequestsNextCursor, true);
}, [
pendingJoinRequestsHasNext,
pendingJoinRequestsLoading,
pendingJoinRequestsNextCursor,
refreshPendingJoinRequests,
]);
return {
event,
hostContextSummary,
approvedParticipants,
pendingJoinRequests,
approvedParticipantsLoading,
pendingJoinRequestsLoading,
approvedParticipantsHasNext,
pendingJoinRequestsHasNext,
isLoading,
apiError,
actionError,
actionState,
isFavorited,
participationStatus,
isQuotaFull,
viewerRatingLoading,
viewerRatingError,
participantRatingLoadingId,
participantRatingError,
canLeave,
constraintViolation,
showJoinRequestModal,
joinRequestMessage,
openJoinRequestModal,
closeJoinRequestModal,
setJoinRequestMessage,
handleJoin,
handleLeaveEvent,
handleRequestJoin,
handleToggleFavorite,
handleViewerRatingSubmit,
handleParticipantRatingSubmit,
dismissViewerRatingError,
dismissParticipantRatingError,
retry,
showRequestsModal,
setShowRequestsModal,
showAttendeesModal,
setShowAttendeesModal,
loadMoreApprovedParticipants,
loadMorePendingJoinRequests,
handleApproveRequest,
handleRejectRequest,
handleCancelEvent,
};
}
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