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import { Alert } from 'react-native';
import * as ImagePicker from 'expo-image-picker';
import * as ImageManipulator from 'expo-image-manipulator';
import { ApiError } from '@/services/api';
import {
createEvent,
searchLocation,
getEventImageUploadUrl,
uploadFileToPresignedUrl,
confirmEventImageUpload,
} from '@/services/eventService';
import {
PrivacyLevel,
LocationSuggestion,
CreateEventRequest,
CreateEventResponse,
EventConstraint,
EventCategory,
} from '@/models/event';
export const CATEGORIES: EventCategory[] = [
{ id: 1, name: 'Sports' },
{ id: 2, name: 'Music' },
{ id: 3, name: 'Education' },
{ id: 4, name: 'Technology' },
{ id: 5, name: 'Art' },
{ id: 6, name: 'Food & Drink' },
{ id: 7, name: 'Outdoors' },
{ id: 8, name: 'Fitness' },
{ id: 9, name: 'Networking' },
{ id: 10, name: 'Gaming' },
{ id: 11, name: 'Charity' },
{ id: 12, name: 'Photography' },
{ id: 13, name: 'Travel' },
{ id: 14, name: 'Workshops' },
{ id: 15, name: 'Conferences' },
{ id: 16, name: 'Movies & Cinema' },
{ id: 17, name: 'Theatre' },
{ id: 18, name: 'Books & Literature' },
{ id: 19, name: 'Wellness' },
{ id: 20, name: 'Volunteering' },
];
export const CATEGORY_PREVIEW_COUNT = 6;
export const PRIVACY_OPTIONS: { label: string; value: PrivacyLevel }[] = [
{ label: 'Public', value: 'PUBLIC' },
{ label: 'Protected', value: 'PROTECTED' },
];
export const CONSTRAINT_TYPES = ['gender', 'age', 'capacity', 'other'] as const;
export type ConstraintType = (typeof CONSTRAINT_TYPES)[number];
export const MAX_CONSTRAINTS = 5;
export const CONSTRAINT_TYPE_LIMITS: Record<ConstraintType, number> = {
gender: 1,
age: 1,
capacity: 1,
other: MAX_CONSTRAINTS,
};
export interface CreateEventFormData {
title: string;
description: string;
imageUrl: string;
categoryId: number | null;
locationQuery: string;
address: string;
lat: number | null;
lon: number | null;
startDate: string;
startTime: string;
endDate: string;
endTime: string;
privacyLevel: PrivacyLevel;
tags: string[];
tagInput: string;
constraints: EventConstraint[];
constraintType: ConstraintType;
// Type-specific constraint inputs
genderConstraintValue: 'MALE' | 'FEMALE' | null;
ageMinInput: string;
ageMaxInput: string;
capacityInput: string;
otherConstraintInput: string;
}
export interface CreateEventFormErrors {
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;
constraints?: string | null;
}
export interface CreateEventViewModel {
formData: CreateEventFormData;
errors: CreateEventFormErrors;
isLoading: boolean;
isUploadingImage: boolean;
apiError: string | null;
imageError: string | null;
successMessage: string | null;
imageUploadSuccessMessage: string | null;
selectedImageUri: string | null;
locationSuggestions: LocationSuggestion[];
isSearchingLocation: boolean;
categoriesExpanded: boolean;
constraintTypeCounts: Record<ConstraintType, number>;
updateField: <K extends keyof CreateEventFormData>(
field: K,
value: CreateEventFormData[K],
) => void;
handleLocationSearch: (query: string) => void;
selectLocation: (suggestion: LocationSuggestion) => void;
clearLocation: () => void;
toggleCategoriesExpanded: () => void;
addTag: () => void;
removeTag: (index: number) => void;
addGenderConstraint: (gender: 'MALE' | 'FEMALE') => void;
addConstraint: () => void;
removeConstraint: (index: number) => void;
pickImage: () => Promise<void>;
removeImage: () => void;
handleSubmit: (token: string) => Promise<CreateEventResponse | null>;
}
export function formatDateForForm(date: Date): string {
const day = String(date.getDate()).padStart(2, '0');
const month = String(date.getMonth() + 1).padStart(2, '0');
const year = String(date.getFullYear());
return `${day}.${month}.${year}`;
}
function decodeFileUriOnce(uri: string): string {
Iif (!uri.startsWith('file://')) {
return uri;
}
try {
return `file://${decodeURIComponent(uri.slice('file://'.length))}`;
} catch {
return uri;
}
}
export function normalizePickedImageUri(uri: string): string {
let normalized = uri;
for (let i = 0; i < 3; i += 1) {
const next = decodeFileUriOnce(normalized);
if (next === normalized) break;
normalized = next;
}
return normalized;
}
function getPickedImageUriCandidates(uri: string): string[] {
return [...new Set([uri, decodeFileUriOnce(uri), normalizePickedImageUri(uri)])];
}
async function preparePickedImageUri(uri: string): Promise<string> {
let lastError: unknown = null;
for (const candidateUri of getPickedImageUriCandidates(uri)) {
try {
const preparedImage = await ImageManipulator.manipulateAsync(
candidateUri,
[],
{ compress: 0.9, format: ImageManipulator.SaveFormat.JPEG },
);
return preparedImage.uri;
} catch (error) {
lastError = error;
}
}
throw lastError ?? new Error('Could not prepare the selected image');
}
export const INITIAL_FORM_DATA: CreateEventFormData = {
title: '',
description: '',
imageUrl: '',
categoryId: null,
locationQuery: '',
address: '',
lat: null,
lon: null,
startDate: formatDateForForm(new Date()),
startTime: '',
endDate: '',
endTime: '',
privacyLevel: 'PUBLIC',
tags: [],
tagInput: '',
constraints: [],
constraintType: 'gender',
genderConstraintValue: null,
ageMinInput: '',
ageMaxInput: '',
capacityInput: '',
otherConstraintInput: '',
};
export function formatTimeInput(current: string, previous: string): string {
// Strip non-digit and non-colon characters
const cleaned = current.replace(/[^\d:]/g, '');
// If user is deleting, don't auto-format
if (cleaned.length < previous.length) return cleaned;
// After typing 2 digits, auto-insert ':'
if (cleaned.length === 2 && !cleaned.includes(':')) {
return cleaned + ':';
}
// Limit to HH:mm format (5 chars)
if (cleaned.length > 5) return cleaned.slice(0, 5);
return cleaned;
}
/** Formats typing into `dd.mm.yyyy` with auto-inserted dots (like `formatTimeInput` for times). */
function formatDigitsToDate(digits: string): string {
Iif (digits.length === 0) return '';
const day = digits.slice(0, 2);
if (digits.length <= 2) return day;
const month = digits.slice(2, 4);
if (digits.length <= 4) return `${day}.${month}`;
const year = digits.slice(4, 8);
return `${day}.${month}.${year}`;
}
export function formatDateInput(current: string, previous: string): string {
const digits = current.replace(/\D/g, '');
const prevDigits = previous.replace(/\D/g, '');
if (digits.length < prevDigits.length) {
return formatDigitsToDate(digits);
}
return formatDigitsToDate(digits.slice(0, 8));
}
/** Returns an error message if the date string (dd.mm.yyyy) is invalid, or null if valid. */
export function validateDateFormat(date: string): string | null {
const parts = date.split('.');
Iif (parts.length !== 3) return 'Invalid date format';
const [dayStr, monthStr, yearStr] = parts;
Iif (yearStr.length < 4) return 'Invalid date format';
const day = parseInt(dayStr, 10);
const month = parseInt(monthStr, 10);
const year = parseInt(yearStr, 10);
Iif (isNaN(day) || isNaN(month) || isNaN(year)) return 'Invalid date';
Iif (month < 1 || month > 12) return 'Invalid date: month must be 1–12';
Iif (day < 1 || day > 31) return 'Invalid date: day must be 1–31';
// Guard against JS Date silently normalizing overflow (e.g. 30.02.2030 → March)
const iso = `${year}-${monthStr.padStart(2, '0')}-${dayStr.padStart(2, '0')}T00:00:00`;
const parsed = new Date(iso);
if (
isNaN(parsed.getTime()) ||
parsed.getFullYear() !== year ||
parsed.getMonth() + 1 !== month ||
parsed.getDate() !== day
) {
return 'Invalid date';
}
return null;
}
/** Returns an error message if the time string (HH:mm) is invalid, or null if valid. */
export function validateTimeFormat(time: string): string | null {
const parts = time.split(':');
Iif (parts.length !== 2) return 'Invalid time format';
const [hourStr, minuteStr] = parts;
const hour = parseInt(hourStr, 10);
const minute = parseInt(minuteStr, 10);
Iif (isNaN(hour) || isNaN(minute)) return 'Invalid time';
Iif (hour < 0 || hour > 23) return 'Invalid time: hour must be 0–23';
Iif (minute < 0 || minute > 59) return 'Invalid time: minute must be 0–59';
return null;
}
function isCompleteDateInput(date: string): boolean {
return date.length === 10;
}
function isCompleteTimeInput(time: string): boolean {
return time.length === 5;
}
export function validateLiveDateInput(date: string): string | null {
Iif (!date) return null;
const parts = date.split('.');
const dayStr = parts[0] ?? '';
const monthStr = parts[1] ?? '';
if (dayStr.length === 2) {
const day = parseInt(dayStr, 10);
if (isNaN(day) || day < 1 || day > 31) {
return 'Invalid date: day must be 1-31';
}
}
if (monthStr.length === 2) {
const month = parseInt(monthStr, 10);
if (isNaN(month) || month < 1 || month > 12) {
return 'Invalid date: month must be 1-12';
}
}
if (isCompleteDateInput(date)) {
return validateDateFormat(date);
}
return null;
}
export function validateLiveTimeInput(time: string): string | null {
Iif (!time) return null;
const parts = time.split(':');
const hourStr = parts[0] ?? '';
const minuteStr = parts[1] ?? '';
if (hourStr.length === 2) {
const hour = parseInt(hourStr, 10);
if (isNaN(hour) || hour < 0 || hour > 23) {
return 'Invalid time: hour must be 0-23';
}
}
if (minuteStr.length === 2) {
const minute = parseInt(minuteStr, 10);
if (isNaN(minute) || minute < 0 || minute > 59) {
return 'Invalid time: minute must be 0-59';
}
}
if (isCompleteTimeInput(time)) {
return validateTimeFormat(time);
}
return null;
}
function parseDateTime(date: string, time: string): string | null {
Iif (!date || !time) return null;
const [dayStr, monthStr, yearStr] = date.split('.');
Iif (!dayStr || !monthStr || !yearStr) return null;
const iso = `${yearStr}-${monthStr.padStart(2, '0')}-${dayStr.padStart(2, '0')}T${time}:00`;
const parsed = new Date(iso);
Iif (isNaN(parsed.getTime())) return null;
return parsed.toISOString();
}
export const TITLE_MIN_LENGTH = 10;
export const TITLE_MAX_LENGTH = 60;
export const DESCRIPTION_MIN_LENGTH = 20;
export const DESCRIPTION_MAX_LENGTH = 600;
export const CAPACITY_MIN = 2;
function getDateTimeErrors(
formData: CreateEventFormData,
requireMissingFields: boolean,
): Pick<CreateEventFormErrors, 'startDate' | 'startTime' | 'endDate' | 'endTime'> {
const errors: Pick<CreateEventFormErrors, 'startDate' | 'startTime' | 'endDate' | 'endTime'> = {
startDate: null,
startTime: null,
endDate: null,
endTime: null,
};
if (!formData.startDate) {
if (requireMissingFields) errors.startDate = 'Start date is required';
} else {
errors.startDate = validateLiveDateInput(formData.startDate);
}
if (!formData.startTime) {
if (requireMissingFields) errors.startTime = 'Start time is required';
} else {
errors.startTime = validateLiveTimeInput(formData.startTime);
}
const hasComparableStartDateTime =
isCompleteDateInput(formData.startDate) &&
isCompleteTimeInput(formData.startTime) &&
!errors.startDate &&
!errors.startTime;
if (hasComparableStartDateTime) {
const parsedStart = parseDateTime(formData.startDate, formData.startTime);
Iif (!parsedStart) {
errors.startDate = 'Invalid start date';
} else if (new Date(parsedStart) <= new Date()) {
errors.startDate = 'Start date must be in the future';
}
}
const hasEndInput = Boolean(formData.endDate || formData.endTime);
if (hasEndInput) {
Iif (!formData.endDate) {
if (requireMissingFields) errors.endDate = 'End date is required';
} else {
errors.endDate = validateLiveDateInput(formData.endDate);
}
Iif (!formData.endTime) {
if (requireMissingFields) errors.endTime = 'End time is required';
} else {
errors.endTime = validateLiveTimeInput(formData.endTime);
}
const hasComparableEndDateTime =
isCompleteDateInput(formData.endDate) &&
isCompleteTimeInput(formData.endTime) &&
!errors.endDate &&
!errors.endTime;
Eif (hasComparableEndDateTime) {
const parsedEnd = parseDateTime(formData.endDate, formData.endTime);
const parsedStart = hasComparableStartDateTime
? parseDateTime(formData.startDate, formData.startTime)
: null;
Iif (!parsedEnd) {
errors.endDate = 'Invalid end date';
} else if (parsedStart && new Date(parsedEnd) <= new Date(parsedStart)) {
errors.endDate = 'End must be after start';
}
}
}
return errors;
}
function validateForm(formData: CreateEventFormData): CreateEventFormErrors {
const errors: CreateEventFormErrors = {};
const trimmedTitle = formData.title.trim();
if (!trimmedTitle) {
errors.title = 'Title is required';
} else if (trimmedTitle.length < TITLE_MIN_LENGTH) {
errors.title = `Title must be at least ${TITLE_MIN_LENGTH} characters`;
} else Iif (trimmedTitle.length > TITLE_MAX_LENGTH) {
errors.title = `Title must be at most ${TITLE_MAX_LENGTH} characters`;
}
const trimmedDescription = formData.description.trim();
if (!trimmedDescription) {
errors.description = 'Description is required';
} else if (trimmedDescription.length < DESCRIPTION_MIN_LENGTH) {
errors.description = `Description must be at least ${DESCRIPTION_MIN_LENGTH} characters`;
} else Iif (trimmedDescription.length > DESCRIPTION_MAX_LENGTH) {
errors.description = `Description must be at most ${DESCRIPTION_MAX_LENGTH} characters`;
}
if (formData.categoryId === null) {
errors.categoryId = 'Please select a category';
}
if (formData.lat === null || formData.lon === null) {
errors.location = 'Please select a location';
}
Object.assign(errors, getDateTimeErrors(formData, true));
return errors;
}
function getImageUploadErrorMessage(error: unknown): string {
Iif (error instanceof ApiError) {
return error.message;
}
Eif (error instanceof Error) {
if (error.message === 'Network request failed') {
return 'The event was created, but uploading the image failed because the network request did not complete.';
}
Iif (error.message === 'Missing upload instructions from server') {
return 'The server returned incomplete image upload instructions.';
}
Iif (error.message.startsWith('Unsupported upload method')) {
return 'The server returned an unsupported image upload method.';
}
Eif (error.message.startsWith('Upload failed with status')) {
return 'The event was created, but uploading the image to storage failed.';
}
return error.message;
}
return 'The event was created, but the image upload failed.';
}
function isLocalDateTimeError(
field: 'startDate' | 'startTime' | 'endDate' | 'endTime',
error: string | null | undefined,
): boolean {
if (error == null) return true;
const localErrorsByField: Record<
'startDate' | 'startTime' | 'endDate' | 'endTime',
Set<string>
> = {
startDate: new Set([
'Start date is required',
'Invalid date format',
'Invalid date',
'Invalid date: day must be 1–31',
'Invalid date: month must be 1–12',
'Invalid date: day must be 1-31',
'Invalid date: month must be 1-12',
'Start date must be in the future',
'Invalid start date',
]),
startTime: new Set([
'Start time is required',
'Invalid time format',
'Invalid time',
'Invalid time: hour must be 0–23',
'Invalid time: minute must be 0–59',
'Invalid time: hour must be 0-23',
'Invalid time: minute must be 0-59',
]),
endDate: new Set([
'End date is required',
'Invalid date format',
'Invalid date',
'Invalid date: day must be 1–31',
'Invalid date: month must be 1–12',
'Invalid date: day must be 1-31',
'Invalid date: month must be 1-12',
'End must be after start',
'Invalid end date',
]),
endTime: new Set([
'End time is required',
'Invalid time format',
'Invalid time',
'Invalid time: hour must be 0–23',
'Invalid time: minute must be 0–59',
'Invalid time: hour must be 0-23',
'Invalid time: minute must be 0-59',
]),
};
return localErrorsByField[field].has(error);
}
export function useCreateEventViewModel(): CreateEventViewModel {
const [formData, setFormData] = useState<CreateEventFormData>(INITIAL_FORM_DATA);
const [errors, setErrors] = useState<CreateEventFormErrors>({});
const [isLoading, setIsLoading] = useState(false);
const [apiError, setApiError] = useState<string | null>(null);
const [imageError, setImageError] = useState<string | null>(null);
const [successMessage, setSuccessMessage] = useState<string | null>(null);
const [imageUploadSuccessMessage, setImageUploadSuccessMessage] = useState<string | null>(null);
const [locationSuggestions, setLocationSuggestions] = useState<LocationSuggestion[]>([]);
const [isSearchingLocation, setIsSearchingLocation] = useState(false);
const [categoriesExpanded, setCategoriesExpanded] = useState(false);
const [selectedImageUri, setSelectedImageUri] = useState<string | null>(null);
const [isUploadingImage, setIsUploadingImage] = useState(false);
const [hasAttemptedSubmit, setHasAttemptedSubmit] = useState(false);
const searchTimeoutRef = useRef<ReturnType<typeof setTimeout> | null>(null);
const imageUploadSuccessTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
const clearImageUploadSuccessMessage = useCallback(() => {
Iif (imageUploadSuccessTimerRef.current) {
clearTimeout(imageUploadSuccessTimerRef.current);
imageUploadSuccessTimerRef.current = null;
}
setImageUploadSuccessMessage(null);
}, []);
useEffect(
() => () => {
if (imageUploadSuccessTimerRef.current) clearTimeout(imageUploadSuccessTimerRef.current);
},
[],
);
const constraintTypeCounts = useMemo(() => {
const counts: Record<ConstraintType, number> = { gender: 0, age: 0, capacity: 0, other: 0 };
formData.constraints.forEach((c) => {
const t = c.type as ConstraintType;
Eif (t in counts) counts[t]++;
});
return counts;
}, [formData.constraints]);
const updateField = useCallback(
<K extends keyof CreateEventFormData>(field: K, value: CreateEventFormData[K]) => {
setFormData((prev) => ({ ...prev, [field]: value }));
// Map form fields to their corresponding error keys
const errorKeyMap: Partial<Record<keyof CreateEventFormData, keyof CreateEventFormErrors>> = {
locationQuery: 'location',
};
const errorKey = (errorKeyMap[field] ?? field) as keyof CreateEventFormErrors;
setErrors((prev) => {
const next = { ...prev, [errorKey]: null };
// Time changes also clear the associated date error (cross-field "must be after" constraint)
if (field === 'startTime') next.startDate = null;
if (field === 'endTime') next.endDate = null;
return next;
});
setApiError(null);
setSuccessMessage(null);
clearImageUploadSuccessMessage();
},
[clearImageUploadSuccessMessage],
);
const toggleCategoriesExpanded = useCallback(() => {
setCategoriesExpanded((prev) => !prev);
}, []);
useEffect(() => {
const nextDateTimeErrors = getDateTimeErrors(formData, hasAttemptedSubmit);
setErrors((prev) => {
const hasExistingDateTimeError = Boolean(
prev.startDate || prev.startTime || prev.endDate || prev.endTime,
);
if (
!hasAttemptedSubmit &&
Object.values(nextDateTimeErrors).every((value) => value == null) &&
!hasExistingDateTimeError
) {
return prev;
}
const dateTimeKeys: Array<keyof typeof nextDateTimeErrors> = [
'startDate',
'startTime',
'endDate',
'endTime',
];
const changed = dateTimeKeys.some((key) => {
if (!isLocalDateTimeError(key, prev[key])) {
return false;
}
return prev[key] !== nextDateTimeErrors[key];
});
if (!changed) return prev;
const nextErrors = { ...prev };
dateTimeKeys.forEach((key) => {
if (isLocalDateTimeError(key, prev[key])) {
nextErrors[key] = nextDateTimeErrors[key];
}
});
return nextErrors;
});
}, [
formData.startDate,
formData.startTime,
formData.endDate,
formData.endTime,
hasAttemptedSubmit,
]);
const handleLocationSearch = useCallback((query: string) => {
setFormData((prev) => ({ ...prev, locationQuery: query }));
setErrors((prev) => ({ ...prev, location: null }));
Iif (searchTimeoutRef.current) {
clearTimeout(searchTimeoutRef.current);
}
Iif (query.trim().length < 2) {
setLocationSuggestions([]);
return;
}
searchTimeoutRef.current = setTimeout(async () => {
setIsSearchingLocation(true);
const results = await searchLocation(query);
setLocationSuggestions(results);
setIsSearchingLocation(false);
}, 400);
}, []);
const selectLocation = useCallback((suggestion: LocationSuggestion) => {
setFormData((prev) => ({
...prev,
locationQuery: suggestion.display_name,
address: suggestion.display_name,
lat: parseFloat(suggestion.lat),
lon: parseFloat(suggestion.lon),
}));
setLocationSuggestions([]);
setErrors((prev) => ({ ...prev, location: null }));
}, []);
const clearLocation = useCallback(() => {
setFormData((prev) => ({
...prev,
locationQuery: '',
address: '',
lat: null,
lon: null,
}));
setLocationSuggestions([]);
}, []);
const addTag = useCallback(() => {
setFormData((prev) => {
const tag = prev.tagInput.trim();
if (!tag || prev.tags.length >= 5 || prev.tags.includes(tag)) return prev;
Iif (tag.length > 20) {
setErrors((e) => ({ ...e, tags: 'Each tag must be at most 20 characters' }));
return prev;
}
return { ...prev, tags: [...prev.tags, tag], tagInput: '' };
});
setErrors((prev) => ({ ...prev, tags: null }));
}, []);
const removeTag = useCallback((index: number) => {
setFormData((prev) => ({
...prev,
tags: prev.tags.filter((_, i) => i !== index),
}));
}, []);
const addGenderConstraint = useCallback((gender: 'MALE' | 'FEMALE') => {
setFormData((prev) => {
Iif (prev.constraints.length >= MAX_CONSTRAINTS) return prev;
const genderCount = prev.constraints.filter((c) => c.type === 'gender').length;
if (genderCount >= CONSTRAINT_TYPE_LIMITS.gender) return prev;
const info = gender === 'MALE' ? 'Males only' : 'Females only';
return {
...prev,
constraints: [...prev.constraints, { type: 'gender', info }],
genderConstraintValue: null,
};
});
setErrors((prev) => ({ ...prev, constraints: null }));
}, []);
const addConstraint = useCallback(() => {
setFormData((prev) => {
if (prev.constraints.length >= MAX_CONSTRAINTS) {
setErrors((e) => ({ ...e, constraints: `Maximum ${MAX_CONSTRAINTS} constraints allowed` }));
return prev;
}
const type = prev.constraintType;
const typeCounts: Record<ConstraintType, number> = { gender: 0, age: 0, capacity: 0, other: 0 };
prev.constraints.forEach((c) => {
const t = c.type as ConstraintType;
Eif (t in typeCounts) typeCounts[t]++;
});
Iif (typeCounts[type] >= CONSTRAINT_TYPE_LIMITS[type]) {
setErrors((e) => ({ ...e, constraints: `Only ${CONSTRAINT_TYPE_LIMITS[type]} ${type} constraint allowed` }));
return prev;
}
let info = '';
const updates: Partial<CreateEventFormData> = {};
switch (type) {
case 'gender': {
if (!prev.genderConstraintValue) return prev;
info = prev.genderConstraintValue === 'MALE' ? 'Males only' : 'Females only';
updates.genderConstraintValue = null;
break;
}
case 'age': {
const min = prev.ageMinInput.trim();
const max = prev.ageMaxInput.trim();
Iif (!min && !max) return prev;
Eif (min) {
const minNum = parseInt(min, 10);
if (isNaN(minNum) || minNum < 0 || minNum > 120) {
setErrors((e) => ({ ...e, constraints: 'Age must be between 0 and 120' }));
return prev;
}
}
if (max) {
const maxNum = parseInt(max, 10);
Iif (isNaN(maxNum) || maxNum < 0 || maxNum > 120) {
setErrors((e) => ({ ...e, constraints: 'Age must be between 0 and 120' }));
return prev;
}
}
if (min && max) {
const minNum = parseInt(min, 10);
const maxNum = parseInt(max, 10);
if (minNum > maxNum) {
setErrors((e) => ({ ...e, constraints: 'Minimum age cannot be greater than maximum age' }));
return prev;
}
info = `Ages ${minNum}–${maxNum}`;
} else if (min) {
info = `${parseInt(min, 10)}+`;
} else E{
info = `Under ${parseInt(max, 10)}`;
}
updates.ageMinInput = '';
updates.ageMaxInput = '';
break;
}
case 'capacity': {
const cap = prev.capacityInput.trim();
Iif (!cap) return prev;
const capNum = parseInt(cap, 10);
if (isNaN(capNum) || capNum < CAPACITY_MIN) {
setErrors((e) => ({ ...e, constraints: `Capacity must be at least ${CAPACITY_MIN}` }));
return prev;
}
info = `${capNum} participants`;
updates.capacityInput = '';
break;
}
case 'other': {
info = prev.otherConstraintInput.trim();
Iif (!info) return prev;
updates.otherConstraintInput = '';
break;
}
}
setErrors((e) => ({ ...e, constraints: null }));
const constraint: EventConstraint = { type, info };
return {
...prev,
...updates,
constraints: [...prev.constraints, constraint],
};
});
}, []);
const removeConstraint = useCallback((index: number) => {
setFormData((prev) => ({
...prev,
constraints: prev.constraints.filter((_, i) => i !== index),
}));
}, []);
const pickImage = useCallback(async () => {
setImageError(null);
try {
const { status } = await ImagePicker.requestMediaLibraryPermissionsAsync();
if (status !== 'granted') {
const message = 'Please allow access to your photo library to add an event image.';
setImageError(message);
Alert.alert('Permission required', message);
return;
}
const result = await ImagePicker.launchImageLibraryAsync({
mediaTypes: ['images'],
allowsEditing: true,
aspect: [16, 9],
quality: 0.8,
});
Iif (result.canceled) return;
const asset = result.assets[0];
Iif (!asset?.uri) {
setImageError('We could not read the selected image. Please try a different one.');
return;
}
try {
const preparedImageUri = await preparePickedImageUri(asset.uri);
setSelectedImageUri(preparedImageUri);
} catch {
setImageError('We could not process the selected image. Please try a different one.');
return;
}
setSuccessMessage(null);
} catch {
setImageError('We could not open your photo library. Please try again.');
}
}, []);
const removeImage = useCallback(() => {
setSelectedImageUri(null);
setImageError(null);
}, []);
const uploadEventImage = useCallback(
async (eventId: string, imageUri: string, token: string): Promise<void> => {
setIsUploadingImage(true);
try {
// Resize to original (max 1200px wide) as JPEG
const original = await ImageManipulator.manipulateAsync(
imageUri,
[{ resize: { width: 1200 } }],
{ compress: 0.8, format: ImageManipulator.SaveFormat.JPEG },
);
// Resize to small thumbnail (max 400px wide) as JPEG
const small = await ImageManipulator.manipulateAsync(
imageUri,
[{ resize: { width: 400 } }],
{ compress: 0.7, format: ImageManipulator.SaveFormat.JPEG },
);
// 1. Get presigned upload URLs
const uploadInit = await getEventImageUploadUrl(eventId, token);
const originalUpload = uploadInit.uploads.find((u) => u.variant === 'ORIGINAL');
const smallUpload = uploadInit.uploads.find((u) => u.variant === 'SMALL');
Iif (!originalUpload || !smallUpload) {
throw new Error('Missing upload instructions from server');
}
// 2. Upload both variants
await Promise.all([
uploadFileToPresignedUrl(
originalUpload.method,
originalUpload.url,
originalUpload.headers,
original.uri,
),
uploadFileToPresignedUrl(smallUpload.method, smallUpload.url, smallUpload.headers, small.uri),
]);
// 3. Confirm
await confirmEventImageUpload(eventId, uploadInit.confirm_token, token);
} finally {
setIsUploadingImage(false);
}
},
[],
);
const handleSubmit = useCallback(
async (token: string): Promise<CreateEventResponse | null> => {
setHasAttemptedSubmit(true);
const validationErrors = validateForm(formData);
const hasErrors = Object.values(validationErrors).some((e) => e != null);
if (hasErrors) {
setErrors(validationErrors);
return null;
}
setIsLoading(true);
setApiError(null);
setImageError(null);
setSuccessMessage(null);
clearImageUploadSuccessMessage();
try {
const startTimeISO = parseDateTime(formData.startDate, formData.startTime)!;
const endTimeISO =
formData.endDate && formData.endTime
? parseDateTime(formData.endDate, formData.endTime) ?? undefined
: undefined;
// Map structured constraints to first-class API fields
let preferredGender: 'MALE' | 'FEMALE' | undefined;
let minimumAge: number | undefined;
let capacity: number | undefined;
const otherConstraints: EventConstraint[] = [];
for (const c of formData.constraints) {
switch (c.type) {
case 'gender':
preferredGender = c.info === 'Males only' ? 'MALE' : 'FEMALE';
break;
case 'age': {
// Formats: "18+", "Ages 18–30", "Under 30"
const plusMatch = c.info.match(/^(\d+)\+$/);
const rangeMatch = c.info.match(/^Ages (\d+)/);
if (plusMatch) minimumAge = parseInt(plusMatch[1], 10);
else if (rangeMatch) minimumAge = parseInt(rangeMatch[1], 10);
break;
}
case 'capacity': {
const capMatch = c.info.match(/(\d+)/);
if (capMatch) capacity = parseInt(capMatch[1], 10);
break;
}
case 'other':
otherConstraints.push(c);
break;
}
}
const address = formData.address || undefined;
const request: CreateEventRequest = {
title: formData.title.trim(),
description: formData.description.trim(),
image_url: formData.imageUrl.trim() || undefined,
category_id: formData.categoryId!,
address,
lat: formData.lat ?? undefined,
lon: formData.lon ?? undefined,
location_type: 'POINT',
start_time: startTimeISO,
end_time: endTimeISO,
privacy_level: formData.privacyLevel,
tags: formData.tags.length > 0 ? formData.tags : undefined,
constraints: otherConstraints.length > 0 ? otherConstraints : undefined,
preferred_gender: preferredGender,
minimum_age: minimumAge,
capacity,
};
const result = await createEvent(request, token);
setSuccessMessage('Event created successfully!');
// Upload image if one was selected
if (selectedImageUri) {
try {
await uploadEventImage(result.id, selectedImageUri, token);
Iif (imageUploadSuccessTimerRef.current) clearTimeout(imageUploadSuccessTimerRef.current);
setImageUploadSuccessMessage('Cover image uploaded successfully.');
imageUploadSuccessTimerRef.current = setTimeout(() => {
setImageUploadSuccessMessage(null);
imageUploadSuccessTimerRef.current = null;
}, 5000);
} catch (error) {
setImageError(getImageUploadErrorMessage(error));
}
}
return result;
} catch (err) {
if (err instanceof ApiError) {
if (err.details) {
const fieldErrors: CreateEventFormErrors = {};
for (const [key, msg] of Object.entries(err.details)) {
if (key === 'title') fieldErrors.title = msg;
else Iif (key === 'description') fieldErrors.description = msg;
else Iif (key === 'category_id') fieldErrors.categoryId = msg;
else Iif (key === 'lat' || key === 'lon' || key === 'address')
fieldErrors.location = msg;
else if (key === 'start_time') fieldErrors.startDate = msg;
else Eif (key === 'end_time') fieldErrors.endDate = msg;
else if (key === 'tags') fieldErrors.tags = msg;
else if (key.startsWith('constraints')) fieldErrors.constraints = msg;
}
setErrors(fieldErrors);
}
setApiError(err.message);
} else {
setApiError('An unexpected error occurred. Please try again.');
}
return null;
} finally {
setIsLoading(false);
}
},
[formData, selectedImageUri, uploadEventImage, clearImageUploadSuccessMessage],
);
return {
formData,
errors,
isLoading,
isUploadingImage,
apiError,
imageError,
successMessage,
imageUploadSuccessMessage,
selectedImageUri,
locationSuggestions,
isSearchingLocation,
categoriesExpanded,
constraintTypeCounts,
updateField,
handleLocationSearch,
selectLocation,
clearLocation,
toggleCategoriesExpanded,
addTag,
removeTag,
addGenderConstraint,
addConstraint,
removeConstraint,
pickImage,
removeImage,
handleSubmit,
};
}
|