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import {
createEvent,
listCategories,
searchLocation,
getEventImageUploadUrl,
confirmEventImageUpload,
} from '@/services/eventService';
import { prepareAvatarBlobs } from '@/utils/imageResize';
import { uploadImageVariants } from '@/utils/directImageUpload';
import {
CreateEventResponse,
CategoryItem,
LocationSuggestion,
type PrivacyLevel,
type PreferredGender,
type EventConstraint,
type LocationType,
} from '@/models/event';
import { ApiError } from '@/services/api';
import i18n from '@/i18n';
const TITLE_MIN = 10;
const TITLE_MAX = 60;
const DESC_MIN = 20;
const DESC_MAX = 600;
const CAPACITY_MIN = 2;
const MAX_TAGS = 5;
const TAG_MAX_LENGTH = 20;
export const MAX_CONSTRAINTS = 5;
export const ROUTE_MIN_POINTS = 2;
export const ROUTE_MAX_POINTS = 50;
export interface RouteWaypoint {
lat: number;
lon: number;
label?: string | null;
}
export function deriveRouteAddress(waypoints: RouteWaypoint[]): string {
if (waypoints.length === 0) return '';
const shortLabel = (w: RouteWaypoint): string => {
const trimmed = (w.label ?? '').split(',')[0]?.trim();
if (trimmed) return trimmed;
return `${w.lat.toFixed(4)}, ${w.lon.toFixed(4)}`;
};
const first = shortLabel(waypoints[0]);
const last = shortLabel(waypoints[waypoints.length - 1]);
if (waypoints.length === 1 || first === last) return first;
return `${first} → ${last}`;
}
export const PRIVACY_LEVELS: PrivacyLevel[] = ['PUBLIC', 'PROTECTED', 'PRIVATE'];
export type ConstraintType = 'gender' | 'age' | 'capacity' | 'other';
export interface CreateEventFormData {
title: string;
description: string;
/** Local file to upload via presigned URLs after the event is created. */
imageFile: File | null;
imagePreview: string;
categoryId: number | null;
locationType: LocationType;
locationQuery: string;
address: string;
lat: number | null;
lon: number | null;
routePoints: RouteWaypoint[];
startDate: string;
startTime: string;
endDate: string;
endTime: string;
privacyLevel: PrivacyLevel;
tags: string[];
tagInput: string;
capacity: string;
minimumAge: string;
maximumAge: string;
preferredGender: PreferredGender | '';
childFriendly: boolean;
familyOriented: boolean;
constraints: EventConstraint[];
constraintType: ConstraintType;
otherConstraintInput: string;
}
export interface CreateEventFormErrors {
image?: string | null;
title?: string | null;
description?: string | null;
categoryId?: string | null;
location?: string | null;
startDate?: string | null;
startTime?: string | null;
endDate?: string | null;
endTime?: string | null;
tags?: string | null;
capacity?: string | null;
minimumAge?: string | null;
maximumAge?: string | null;
}
type CreateEventTouchedFields = Partial<Record<keyof CreateEventFormErrors, boolean>>;
const INITIAL: CreateEventFormData = {
title: '',
description: '',
imageFile: null,
imagePreview: '',
categoryId: null,
locationType: 'POINT',
locationQuery: '',
address: '',
lat: null,
lon: null,
routePoints: [],
startDate: '',
startTime: '',
endDate: '',
endTime: '',
privacyLevel: 'PUBLIC',
tags: [],
tagInput: '',
capacity: '',
minimumAge: '',
maximumAge: '',
preferredGender: '',
childFriendly: false,
familyOriented: false,
constraints: [],
constraintType: 'other',
otherConstraintInput: '',
};
function toISODateTime(date: string, time: string): string | null {
if (!date || !time) return null;
try {
const dt = new Date(`${date}T${time}`);
if (isNaN(dt.getTime())) return null;
return dt.toISOString();
} catch {
return null;
}
}
function toDateOnly(date: string): Date | null {
if (!date) return null;
const dt = new Date(`${date}T00:00:00`);
return Number.isNaN(dt.getTime()) ? null : dt;
}
function validateForm(form: CreateEventFormData): CreateEventFormErrors {
const errors: CreateEventFormErrors = {};
if (!form.title.trim()) {
errors.title = i18n.t('errors.create_event_title_required');
} else if (form.title.trim().length < TITLE_MIN) {
errors.title = i18n.t('errors.create_event_title_min', { count: TITLE_MIN });
} else if (form.title.trim().length > TITLE_MAX) {
errors.title = i18n.t('errors.create_event_title_max', { count: TITLE_MAX });
}
if (!form.description.trim()) {
errors.description = i18n.t('errors.create_event_description_required');
} else if (form.description.trim().length < DESC_MIN) {
errors.description = i18n.t('errors.create_event_description_min', { count: DESC_MIN });
} else if (form.description.trim().length > DESC_MAX) {
errors.description = i18n.t('errors.create_event_description_max', { count: DESC_MAX });
}
if (!form.categoryId) {
errors.categoryId = i18n.t('errors.create_event_category_required');
}
if (!form.imageFile) {
errors.image = i18n.t('errors.create_event_image_required');
}
if (form.locationType === 'ROUTE') {
if (form.routePoints.length < ROUTE_MIN_POINTS) {
errors.location = i18n.t('errors.create_event_route_min_points', { count: ROUTE_MIN_POINTS });
}
} else if (form.lat === null || form.lon === null) {
errors.location = i18n.t('errors.create_event_location_required');
}
if (!form.startDate) {
errors.startDate = i18n.t('errors.create_event_start_date_required');
}
if (!form.startTime) {
errors.startTime = i18n.t('errors.create_event_start_time_required');
}
const now = new Date();
const today = new Date(now.getFullYear(), now.getMonth(), now.getDate());
const startDateOnly = form.startDate ? toDateOnly(form.startDate) : null;
if (form.startDate && !startDateOnly) {
errors.startDate = i18n.t('errors.create_event_start_date_invalid');
} else if (startDateOnly && startDateOnly < today) {
errors.startDate = i18n.t('errors.create_event_start_date_past');
}
const startISO = !errors.startDate && form.startDate && form.startTime
? toISODateTime(form.startDate, form.startTime)
: null;
if (!errors.startDate && form.startDate && form.startTime && !startISO) {
errors.startTime = i18n.t('errors.create_event_start_time_invalid');
} else if (
!errors.startDate
&& startDateOnly
&& startDateOnly.getTime() === today.getTime()
&& startISO
&& new Date(startISO) <= now
) {
errors.startTime = i18n.t('errors.create_event_start_time_future');
}
if (form.endDate || form.endTime) {
if (!form.endDate) errors.endDate = i18n.t('errors.create_event_end_date_required');
if (!form.endTime) errors.endTime = i18n.t('errors.create_event_end_time_required');
const endDateOnly = form.endDate ? toDateOnly(form.endDate) : null;
if (form.endDate && !endDateOnly) {
errors.endDate = i18n.t('errors.create_event_end_date_invalid');
} else if (!errors.startDate && startDateOnly && endDateOnly && endDateOnly < startDateOnly) {
errors.endDate = i18n.t('errors.create_event_end_date_before_start');
}
const endISO = !errors.endDate && form.endDate && form.endTime
? toISODateTime(form.endDate, form.endTime)
: null;
if (!errors.endDate && form.endDate && form.endTime && !endISO) {
errors.endTime = i18n.t('errors.create_event_end_time_invalid');
} else if (
!errors.endDate
&& !errors.startDate
&& startDateOnly
&& endDateOnly
&& startISO
&& endISO
&& endDateOnly.getTime() === startDateOnly.getTime()
&& new Date(endISO) <= new Date(startISO)
) {
errors.endTime = i18n.t('errors.create_event_end_time_before_start');
}
}
if (form.capacity) {
const cap = parseInt(form.capacity, 10);
if (isNaN(cap) || cap < CAPACITY_MIN) {
errors.capacity = i18n.t('errors.create_event_capacity_min', { count: CAPACITY_MIN });
}
}
if (form.minimumAge) {
const age = parseInt(form.minimumAge, 10);
if (isNaN(age) || age < 1 || age > 120) {
errors.minimumAge = i18n.t('errors.create_event_age_invalid');
}
}
if (form.maximumAge) {
const age = parseInt(form.maximumAge, 10);
if (isNaN(age) || age < 1 || age > 120) {
errors.maximumAge = i18n.t('errors.create_event_age_invalid');
} else if (form.minimumAge) {
const minAge = parseInt(form.minimumAge, 10);
if (!isNaN(minAge) && age <= minAge) {
errors.maximumAge = i18n.t('errors.create_event_max_age_gt_min');
}
}
}
return errors;
}
export function useCreateEventViewModel() {
const [form, setForm] = useState<CreateEventFormData>(INITIAL);
const [errors, setErrors] = useState<CreateEventFormErrors>({});
const [touched, setTouched] = useState<CreateEventTouchedFields>({});
const [submitAttempted, setSubmitAttempted] = useState(false);
const [isLoading, setIsLoading] = useState(false);
const [isUploadingImage, setIsUploadingImage] = useState(false);
const [apiError, setApiError] = useState<string | null>(null);
const [imageError, setImageError] = useState<string | null>(null);
const [imageUploadSuccessMessage, setImageUploadSuccessMessage] = useState<string | null>(null);
const [coverImageUploadedForLastCreate, setCoverImageUploadedForLastCreate] = useState(false);
const [successMessage, setSuccessMessage] = useState<string | null>(null);
const [categories, setCategories] = useState<CategoryItem[]>([]);
const [locationResults, setLocationResults] = useState<LocationSuggestion[]>([]);
const [locationSearching, setLocationSearching] = useState(false);
const searchTimeout = useRef<ReturnType<typeof setTimeout>>(undefined);
const imageUploadSuccessTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
const clearImageUploadSuccessToast = useCallback(() => {
if (imageUploadSuccessTimerRef.current) {
clearTimeout(imageUploadSuccessTimerRef.current);
imageUploadSuccessTimerRef.current = null;
}
setImageUploadSuccessMessage(null);
}, []);
useEffect(
() => () => {
if (imageUploadSuccessTimerRef.current) clearTimeout(imageUploadSuccessTimerRef.current);
},
[],
);
useEffect(() => {
listCategories()
.then((res) => setCategories(res.items))
.catch(() => {});
}, []);
const getVisibleErrors = useCallback(
(nextForm: CreateEventFormData, nextTouched: CreateEventTouchedFields, forceAll = false) => {
const validationErrors = validateForm(nextForm);
if (forceAll) return validationErrors;
const visibleErrors: CreateEventFormErrors = {};
(Object.keys(validationErrors) as (keyof CreateEventFormErrors)[]).forEach((key) => {
if (nextTouched[key]) {
visibleErrors[key] = validationErrors[key];
}
});
return visibleErrors;
},
[],
);
useEffect(() => {
setErrors(getVisibleErrors(form, touched, submitAttempted));
}, [form, touched, submitAttempted, getVisibleErrors]);
const updateField = useCallback(
<K extends keyof CreateEventFormData>(field: K, value: CreateEventFormData[K]) => {
setForm((prev) => ({ ...prev, [field]: value }));
setApiError(null);
setImageError(null);
setSuccessMessage(null);
clearImageUploadSuccessToast();
setCoverImageUploadedForLastCreate(false);
},
[clearImageUploadSuccessToast],
);
const touchField = useCallback(
(field: keyof CreateEventFormErrors) => {
setTouched((prev) => {
if (prev[field]) return prev;
return { ...prev, [field]: true };
});
},
[],
);
const handleLocationSearch = useCallback((query: string) => {
updateField('locationQuery', query);
updateField('lat', null);
updateField('lon', null);
updateField('address', '');
setLocationResults([]);
if (searchTimeout.current) clearTimeout(searchTimeout.current);
if (query.trim().length < 3) return;
searchTimeout.current = setTimeout(async () => {
setLocationSearching(true);
try {
const results = await searchLocation(query);
setLocationResults(results);
} catch {
setLocationResults([]);
} finally {
setLocationSearching(false);
}
}, 400);
}, [updateField]);
const selectLocation = useCallback((suggestion: LocationSuggestion) => {
setForm((prev) => ({
...prev,
locationQuery: suggestion.display_name,
address: suggestion.display_name,
lat: parseFloat(suggestion.lat),
lon: parseFloat(suggestion.lon),
}));
setLocationResults([]);
setErrors((prev) => ({ ...prev, location: undefined }));
}, []);
const addTag = useCallback(() => {
setForm((prev) => {
const tag = prev.tagInput.trim();
if (!tag || prev.tags.length >= MAX_TAGS || tag.length > TAG_MAX_LENGTH) return prev;
if (prev.tags.some((t) => t.toLowerCase() === tag.toLowerCase())) return prev;
return { ...prev, tags: [...prev.tags, tag], tagInput: '' };
});
}, []);
const removeTag = useCallback((index: number) => {
setForm((prev) => ({
...prev,
tags: prev.tags.filter((_, i) => i !== index),
}));
}, []);
const addConstraint = useCallback(() => {
setForm((prev) => {
if (prev.constraints.length >= MAX_CONSTRAINTS) return prev;
let constraint: EventConstraint | null = null;
if (prev.constraintType === 'other' && prev.otherConstraintInput.trim()) {
constraint = { type: 'other', info: prev.otherConstraintInput.trim() };
}
if (!constraint) return prev;
return {
...prev,
constraints: [...prev.constraints, constraint],
otherConstraintInput: '',
};
});
}, []);
const handleImageUpload = useCallback(
(file: File | null) => {
setImageError(null);
setTouched((prev) => ({ ...prev, image: true }));
if (!file) {
setForm((prev) => ({ ...prev, imageFile: null, imagePreview: '' }));
return;
}
const reader = new FileReader();
reader.onloadend = () => {
setForm((prev) => ({ ...prev, imageFile: file, imagePreview: reader.result as string }));
};
reader.readAsDataURL(file);
},
[],
);
const removeImage = useCallback(() => {
setImageError(null);
setTouched((prev) => ({ ...prev, image: true }));
setForm((prev) => ({ ...prev, imageFile: null, imagePreview: '' }));
}, []);
const setLocationType = useCallback((type: LocationType) => {
setForm((prev) => {
if (prev.locationType === type) return prev;
return {
...prev,
locationType: type,
...(type === 'ROUTE'
? { lat: null, lon: null, address: '', locationQuery: '' }
: { routePoints: [] }),
};
});
setLocationResults([]);
setErrors((prev) => ({ ...prev, location: undefined }));
}, []);
const addRoutePointFromSuggestion = useCallback((suggestion: LocationSuggestion) => {
const lat = parseFloat(suggestion.lat);
const lon = parseFloat(suggestion.lon);
if (Number.isNaN(lat) || Number.isNaN(lon)) return;
setForm((prev) => {
if (prev.routePoints.length >= ROUTE_MAX_POINTS) return prev;
return {
...prev,
locationQuery: '',
routePoints: [
...prev.routePoints,
{ lat, lon, label: suggestion.display_name },
],
};
});
setLocationResults([]);
setErrors((prev) => ({ ...prev, location: undefined }));
}, []);
const addRoutePointFromCoordinate = useCallback(
(lat: number, lon: number, label?: string | null) => {
setForm((prev) => {
if (prev.routePoints.length >= ROUTE_MAX_POINTS) return prev;
return {
...prev,
routePoints: [...prev.routePoints, { lat, lon, label: label ?? null }],
};
});
setErrors((prev) => ({ ...prev, location: undefined }));
},
[],
);
const removeRoutePoint = useCallback((index: number) => {
setForm((prev) => {
if (index < 0 || index >= prev.routePoints.length) return prev;
const next = [...prev.routePoints];
next.splice(index, 1);
return { ...prev, routePoints: next };
});
}, []);
const moveRoutePoint = useCallback((index: number, direction: -1 | 1) => {
setForm((prev) => {
const target = index + direction;
if (target < 0 || target >= prev.routePoints.length) return prev;
const next = [...prev.routePoints];
[next[index], next[target]] = [next[target], next[index]];
return { ...prev, routePoints: next };
});
}, []);
const updateRoutePointLabel = useCallback((index: number, label: string) => {
setForm((prev) => {
if (index < 0 || index >= prev.routePoints.length) return prev;
const next = [...prev.routePoints];
next[index] = { ...next[index], label };
return { ...prev, routePoints: next };
});
}, []);
const removeConstraint = useCallback((index: number) => {
setForm((prev) => ({
...prev,
constraints: prev.constraints.filter((_, i) => i !== index),
}));
}, []);
const handleSubmit = useCallback(
async (token: string): Promise<CreateEventResponse | null> => {
setSubmitAttempted(true);
const validationErrors = validateForm(form);
const hasErrors = Object.values(validationErrors).some((e) => e != null);
if (hasErrors) {
// Errors will be synced by the useEffect, but we can set them immediately too for responsiveness
setErrors(validationErrors);
return null;
}
setIsLoading(true);
setApiError(null);
setImageError(null);
clearImageUploadSuccessToast();
setCoverImageUploadedForLastCreate(false);
try {
const startTime = toISODateTime(form.startDate, form.startTime)!;
const endTime = toISODateTime(form.endDate, form.endTime);
const isRoute = form.locationType === 'ROUTE';
const routeAddress = isRoute ? deriveRouteAddress(form.routePoints) : undefined;
const request = {
title: form.title.trim(),
description: form.description.trim(),
category_id: form.categoryId!,
address: isRoute ? routeAddress : (form.address || undefined),
...(isRoute
? { route_points: form.routePoints.map((p) => ({ lat: p.lat, lon: p.lon })) }
: { lat: form.lat!, lon: form.lon! }),
location_type: form.locationType,
start_time: startTime,
end_time: endTime || undefined,
capacity: form.capacity ? parseInt(form.capacity, 10) : undefined,
privacy_level: form.privacyLevel,
tags: form.tags.length > 0 ? form.tags : undefined,
constraints: form.constraints.length > 0 ? form.constraints : undefined,
minimum_age: form.minimumAge ? parseInt(form.minimumAge, 10) : undefined,
maximum_age: form.maximumAge ? parseInt(form.maximumAge, 10) : undefined,
preferred_gender: form.preferredGender || undefined,
child_friendly: form.childFriendly,
family_oriented: form.familyOriented,
};
const result = await createEvent(request, token);
if (form.imageFile) {
setIsUploadingImage(true);
setImageError(null);
try {
const { original, small } = await prepareAvatarBlobs(form.imageFile);
const uploadInit = await getEventImageUploadUrl(result.id, token);
await uploadImageVariants(uploadInit, { original, small });
await confirmEventImageUpload(
result.id,
{ confirm_token: uploadInit.confirm_token },
token,
);
setCoverImageUploadedForLastCreate(true);
if (imageUploadSuccessTimerRef.current) clearTimeout(imageUploadSuccessTimerRef.current);
setImageUploadSuccessMessage(i18n.t('create_event.cover_uploaded_message'));
imageUploadSuccessTimerRef.current = setTimeout(() => {
setImageUploadSuccessMessage(null);
imageUploadSuccessTimerRef.current = null;
}, 5000);
} catch (err) {
if (err instanceof ApiError) {
setImageError(err.message);
} else {
setImageError(
err instanceof Error
? err.message
: i18n.t('errors.create_event_image_upload_failed_after_create'),
);
}
} finally {
setIsUploadingImage(false);
}
}
setSuccessMessage(i18n.t('errors.create_event_created_success'));
return result;
} catch (err) {
if (err instanceof ApiError) {
setApiError(err.message);
} else {
setApiError(i18n.t('errors.unexpected'));
}
return null;
} finally {
setIsLoading(false);
}
},
[form, clearImageUploadSuccessToast],
);
return {
form,
errors,
isLoading,
isUploadingImage,
apiError,
imageError,
imageUploadSuccessMessage,
coverImageUploadedForLastCreate,
dismissImageUploadSuccess: clearImageUploadSuccessToast,
successMessage,
categories,
locationResults,
locationSearching,
touchField,
updateField,
handleLocationSearch,
selectLocation,
setLocationType,
addRoutePointFromSuggestion,
addRoutePointFromCoordinate,
removeRoutePoint,
moveRoutePoint,
updateRoutePointLabel,
addTag,
removeTag,
handleImageUpload,
removeImage,
addConstraint,
removeConstraint,
handleSubmit,
};
}
|