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import { AbsoluteTime, TranslatedString } from "@gnu-taler/taler-util";
import { ComponentChildren, VNode, createContext, h } from "preact";
import { StateUpdater, useMemo } from "preact/hooks";
export interface FormType<T> {
initialValue: Partial<T>;
value: Partial<T>;
onUpdate: StateUpdater<T>;
computeFormState?: (v: T) => FormState<T>;
}
//@ts-ignore
export const FormContext = createContext<FormType<any>>({});
type FormState<T> = {
[field in keyof T]?: T[field] extends AbsoluteTime
? Partial<InputFieldState>
: T[field] extends object
? FormState<T[field]>
: Partial<InputFieldState>;
};
export interface InputFieldState {
/* should show the error */
error?: TranslatedString;
/* should not allow to edit */
readonly: boolean;
/* should show as disable */
disabled: boolean;
/* should not show */
hidden: boolean;
}
export function FormProvider<T>({
children,
state,
computeFormState,
}: {
state: [Partial<T>, StateUpdater<T>];
computeFormState?: (v: T) => FormState<T>;
children: ComponentChildren;
}): VNode {
const [value, onUpdate] = state;
const initialValue = useMemo(() => value, []);
const contextValue = useMemo(
() => ({ initialValue, value, onUpdate, computeFormState }),
[value, onUpdate, computeFormState],
);
return (
<FormContext.Provider value={contextValue}>
<form>{children}</form>
</FormContext.Provider>
);
}
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