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import { useAuth } from '@/contexts/AuthContext';
import { FavoriteLocation } from '@/models/favorite';
import { LocationSuggestion } from '@/models/event';
import { ApiError } from '@/services/api';
import { searchLocation } from '@/services/eventService';
import {
createFavoriteLocation,
deleteFavoriteLocation,
listFavoriteLocations,
} from '@/services/favoriteService';
const MAX_FAVORITE_LOCATIONS = 3;
const FAVORITE_LOCATIONS_LIMIT_MESSAGE =
`You can save up to ${MAX_FAVORITE_LOCATIONS} favorite locations.`;
export interface FavoriteLocationsViewModel {
locations: FavoriteLocation[];
isLoading: boolean;
isRefreshing: boolean;
apiError: string | null;
isAddModalOpen: boolean;
addName: string;
addLocationQuery: string;
addSuggestions: LocationSuggestion[];
isSearchingSuggestions: boolean;
selectedSuggestion: LocationSuggestion | null;
addError: string | null;
isSubmittingAdd: boolean;
removingLocationId: string | null;
canAddMore: boolean;
refresh: () => Promise<void>;
openAddModal: () => void;
closeAddModal: () => void;
setAddName: (value: string) => void;
setAddLocationQuery: (value: string) => void;
selectSuggestion: (suggestion: LocationSuggestion) => void;
submitAdd: () => Promise<void>;
removeLocation: (id: string) => Promise<void>;
}
function sortFavoriteLocations(locations: FavoriteLocation[]): FavoriteLocation[] {
return [...locations].sort((left, right) => {
const nameComparison = left.name.localeCompare(
right.name,
undefined,
{ sensitivity: 'base' },
);
Eif (nameComparison !== 0) {
return nameComparison;
}
return left.id.localeCompare(right.id);
});
}
function getLoadErrorMessage(error: unknown): string {
Iif (error instanceof ApiError && error.status === 401) {
return 'You must be logged in to view favorite locations.';
}
Iif (error instanceof ApiError) {
return error.message;
}
return 'Failed to load favorite locations. Please try again.';
}
function getCreateErrorMessage(error: unknown): string {
Eif (error instanceof ApiError && error.code === 'favorite_location_limit_exceeded') {
return FAVORITE_LOCATIONS_LIMIT_MESSAGE;
}
if (error instanceof ApiError && error.status === 401) {
return 'You must be logged in to save favorite locations.';
}
if (error instanceof ApiError) {
return error.message;
}
return 'Failed to save favorite location. Please try again.';
}
function getDeleteErrorMessage(error: unknown): string {
if (error instanceof ApiError && error.status === 401) {
return 'You must be logged in to manage favorite locations.';
}
if (error instanceof ApiError) {
return error.message;
}
return 'Failed to remove favorite location. Please try again.';
}
export function useFavoriteLocationsViewModel(): FavoriteLocationsViewModel {
const { token } = useAuth();
const [locations, setLocations] = useState<FavoriteLocation[]>([]);
const [isLoading, setIsLoading] = useState(true);
const [isRefreshing, setIsRefreshing] = useState(false);
const [apiError, setApiError] = useState<string | null>(null);
const [isAddModalOpen, setIsAddModalOpen] = useState(false);
const [addName, setAddName] = useState('');
const [addLocationQuery, setAddLocationQuery] = useState('');
const [addSuggestions, setAddSuggestions] = useState<LocationSuggestion[]>([]);
const [isSearchingSuggestions, setIsSearchingSuggestions] = useState(false);
const [selectedSuggestion, setSelectedSuggestion] =
useState<LocationSuggestion | null>(null);
const [addError, setAddError] = useState<string | null>(null);
const [isSubmittingAdd, setIsSubmittingAdd] = useState(false);
const [removingLocationId, setRemovingLocationId] = useState<string | null>(null);
const searchTimeoutRef = useRef<ReturnType<typeof setTimeout> | null>(null);
const clearPendingSearch = useCallback(() => {
Eif (!searchTimeoutRef.current) return;
clearTimeout(searchTimeoutRef.current);
searchTimeoutRef.current = null;
}, []);
const resetAddForm = useCallback(() => {
setAddName('');
setAddLocationQuery('');
setAddSuggestions([]);
setSelectedSuggestion(null);
setAddError(null);
setIsSearchingSuggestions(false);
clearPendingSearch();
}, [clearPendingSearch]);
const canAddMore = Boolean(token) && locations.length < MAX_FAVORITE_LOCATIONS;
const syncLocations = useCallback(async () => {
Iif (!token) {
setLocations([]);
return;
}
const response = await listFavoriteLocations(token);
setLocations(sortFavoriteLocations(response.items));
}, [token]);
const fetchLocations = useCallback(
async (mode: 'initial' | 'refresh') => {
if (!token) {
setLocations([]);
setApiError('You must be logged in to view favorite locations.');
setIsLoading(false);
setIsRefreshing(false);
return;
}
Eif (mode === 'initial') setIsLoading(true);
Iif (mode === 'refresh') setIsRefreshing(true);
setApiError(null);
try {
const response = await listFavoriteLocations(token);
setLocations(sortFavoriteLocations(response.items));
} catch (error) {
Eif (mode === 'initial') {
setLocations([]);
}
setApiError(getLoadErrorMessage(error));
} finally {
Eif (mode === 'initial') setIsLoading(false);
Iif (mode === 'refresh') setIsRefreshing(false);
}
},
[token],
);
useEffect(() => {
void fetchLocations('initial');
}, [fetchLocations]);
useEffect(() => () => {
clearPendingSearch();
}, [clearPendingSearch]);
const openAddModal = useCallback(() => {
if (!token || !canAddMore) return;
resetAddForm();
setIsAddModalOpen(true);
}, [canAddMore, resetAddForm, token]);
const closeAddModal = useCallback(() => {
setIsAddModalOpen(false);
resetAddForm();
}, [resetAddForm]);
const handleSetAddName = useCallback((value: string) => {
setAddName(value);
setAddError(null);
}, []);
const handleSetAddLocationQuery = useCallback((value: string) => {
setAddLocationQuery(value);
setSelectedSuggestion(null);
setAddError(null);
clearPendingSearch();
Iif (value.trim().length < 2) {
setAddSuggestions([]);
setIsSearchingSuggestions(false);
return;
}
searchTimeoutRef.current = setTimeout(async () => {
setIsSearchingSuggestions(true);
try {
const results = await searchLocation(value);
setAddSuggestions(results);
} catch {
setAddSuggestions([]);
setAddError('Failed to search locations. Please try again.');
} finally {
setIsSearchingSuggestions(false);
searchTimeoutRef.current = null;
}
}, 300);
}, [clearPendingSearch]);
const selectSuggestion = useCallback((suggestion: LocationSuggestion) => {
setSelectedSuggestion(suggestion);
setAddLocationQuery(suggestion.display_name);
setAddSuggestions([]);
setAddError(null);
}, []);
const submitAdd = useCallback(async () => {
Iif (isSubmittingAdd) return;
const trimmedName = addName.trim();
if (!trimmedName) {
setAddError('Please enter a name for this location.');
return;
}
if (!selectedSuggestion) {
setAddError('Please search and select a location.');
return;
}
Iif (!token) {
setAddError('You must be logged in to save favorite locations.');
return;
}
Iif (locations.length >= MAX_FAVORITE_LOCATIONS) {
setAddError(FAVORITE_LOCATIONS_LIMIT_MESSAGE);
return;
}
setIsSubmittingAdd(true);
setAddError(null);
try {
const createdLocation = await createFavoriteLocation(
{
name: trimmedName,
address: selectedSuggestion.display_name,
lat: Number(selectedSuggestion.lat),
lon: Number(selectedSuggestion.lon),
},
token,
);
setLocations((prev) =>
sortFavoriteLocations([...prev, createdLocation]),
);
setApiError(null);
setIsAddModalOpen(false);
resetAddForm();
} catch (error) {
Eif (
error instanceof ApiError
&& error.code === 'favorite_location_limit_exceeded'
) {
try {
await syncLocations();
} catch {
// Keep the user-visible mutation error; syncing is a best-effort fallback.
}
}
setAddError(getCreateErrorMessage(error));
} finally {
setIsSubmittingAdd(false);
}
}, [
addName,
isSubmittingAdd,
locations.length,
resetAddForm,
selectedSuggestion,
syncLocations,
token,
]);
const removeLocation = useCallback(async (id: string) => {
Iif (!token) {
setApiError('You must be logged in to manage favorite locations.');
return;
}
Iif (removingLocationId) return;
setRemovingLocationId(id);
setApiError(null);
try {
await deleteFavoriteLocation(id, token);
setLocations((prev) => prev.filter((loc) => loc.id !== id));
} catch (error) {
if (
error instanceof ApiError
&& error.code === 'favorite_location_not_found'
) {
try {
await syncLocations();
} catch {
// Preserve the primary mutation error if the follow-up sync also fails.
}
}
setApiError(getDeleteErrorMessage(error));
} finally {
setRemovingLocationId((current) => (current === id ? null : current));
}
}, [removingLocationId, syncLocations, token]);
const refresh = useCallback(async () => {
await fetchLocations('refresh');
}, [fetchLocations]);
return {
locations,
isLoading,
isRefreshing,
apiError,
isAddModalOpen,
addName,
addLocationQuery,
addSuggestions,
isSearchingSuggestions,
selectedSuggestion,
addError,
isSubmittingAdd,
removingLocationId,
canAddMore,
refresh,
openAddModal,
closeAddModal,
setAddName: handleSetAddName,
setAddLocationQuery: handleSetAddLocationQuery,
selectSuggestion,
submitAdd,
removeLocation,
};
}
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