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/*
This file is part of GNU Taler
(C) 2021-2023 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/>
*/
/**
*
* @author Sebastian Javier Marchano (sebasjm)
*/
import { ComponentChildren, createContext, h, VNode } from "preact";
import { useContext, useMemo } from "preact/hooks";
type Updater<S> = (value: (prevState: S) => S) => void;
export interface Props<T> {
object?: Partial<T>;
errors?: FormErrors<T>;
name?: string;
valueHandler: Updater<Partial<T>> | null;
children: ComponentChildren;
}
const noUpdater: Updater<Partial<unknown>> = () => (s: unknown) => s;
export function FormProvider<T>({
object = {},
errors = {},
name = "",
valueHandler,
children,
}: Props<T>): VNode {
const initialObject = useMemo(() => object, []);
const value = useMemo<FormType<T>>(
() => ({
errors,
object,
initialObject,
valueHandler: valueHandler ? valueHandler : noUpdater,
name,
toStr: {},
fromStr: {},
}),
[errors, object, valueHandler],
);
return (
<FormContext.Provider value={value}>
<form
class="field"
onSubmit={(e) => {
e.preventDefault();
// if (valueHandler) valueHandler(object);
}}
>
{children}
</form>
</FormContext.Provider>
);
}
export interface FormType<T> {
object: Partial<T>;
initialObject: Partial<T>;
errors: FormErrors<T>;
toStr: FormtoStr<T>;
name: string;
fromStr: FormfromStr<T>;
valueHandler: Updater<Partial<T>>;
}
const FormContext = createContext<FormType<unknown>>(null!);
/**
* FIXME:
* USE MEMORY EVENTS INSTEAD OF CONTEXT
* @deprecated
*/
export function useFormContext<T>() {
return useContext<FormType<T>>(FormContext);
}
export type FormErrors<T> = {
[P in keyof T]?: string | FormErrors<T[P]>;
};
export type FormtoStr<T> = {
[P in keyof T]?: (f?: T[P]) => string;
};
export type FormfromStr<T> = {
[P in keyof T]?: (f: string) => T[P];
};
export type FormUpdater<T> = {
[P in keyof T]?: (f: keyof T) => (v: T[P]) => void;
};
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