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/*
This file is part of GNU Taler
(C) 2022-2024 Taler Systems S.A.
GNU Taler is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
import { AmountJson, TalerBankConversionApi, TranslatedString } from "@gnu-taler/taler-util";
import { useState } from "preact/hooks";
export type UIField = {
value: string | undefined;
onUpdate: (s: string) => void;
error: TranslatedString | undefined;
}
type FormHandler<T> = {
[k in keyof T]?:
T[k] extends string ? UIField :
T[k] extends AmountJson ? UIField :
FormHandler<T[k]>;
}
export type FormValues<T> = {
[k in keyof T]:
T[k] extends string ? (string | undefined) :
T[k] extends AmountJson ? (string | undefined) :
FormValues<T[k]>;
}
export type RecursivePartial<T> = {
[k in keyof T]?:
T[k] extends string ? (string) :
T[k] extends AmountJson ? (AmountJson) :
RecursivePartial<T[k]>;
}
export type FormErrors<T> = {
[k in keyof T]?:
T[k] extends string ? (TranslatedString) :
T[k] extends AmountJson ? (TranslatedString) :
FormErrors<T[k]>;
}
export type FormStatus<T> = {
status: "ok",
result: T,
errors: undefined,
} | {
status: "fail",
result: RecursivePartial<T>,
errors: FormErrors<T>,
}
function constructFormHandler<T>(form: FormValues<T>, updateForm: (d: FormValues<T>) => void, errors: FormErrors<T> | undefined): FormHandler<T> {
const keys = (Object.keys(form) as Array<keyof T>)
const handler = keys.reduce((prev, fieldName) => {
const currentValue: any = form[fieldName];
const currentError: any = errors ? errors[fieldName] : undefined;
function updater(newValue: any) {
updateForm({ ...form, [fieldName]: newValue })
}
if (typeof currentValue === "object") {
const group = constructFormHandler(currentValue, updater, currentError)
// @ts-expect-error asdasd
prev[fieldName] = group
return prev;
}
const field: UIField = {
error: currentError,
value: currentValue,
onUpdate: updater
}
// @ts-expect-error asdasd
prev[fieldName] = field
return prev
}, {} as FormHandler<T>)
return handler;
}
export function useFormState<T>(defaultValue: FormValues<T>, check: (f: FormValues<T>) => FormStatus<T>): [FormHandler<T>, FormStatus<T>] {
const [form, updateForm] = useState<FormValues<T>>(defaultValue)
const status = check(form)
const handler = constructFormHandler(form, updateForm, status.errors)
return [handler, status]
}
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