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/*
This file is part of GNU Taler
(C) 2021 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!)
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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