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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, VNode } from "preact";
import { useFormContext } from "./FormProvider";
interface Use<V> {
error?: string;
required: boolean;
value: any;
initial: any;
onChange: (v: V) => void;
toStr: (f: V | undefined) => string;
fromStr: (v: string) => V
}
export function useField<T>(name: keyof T): Use<T[typeof name]> {
const { errors, object, initialObject, toStr, fromStr, valueHandler } = useFormContext<T>()
type P = typeof name
type V = T[P]
const updateField = (field: P) => (value: V): void => {
return valueHandler((prev) => {
return setValueDeeper(prev, String(field).split('.'), value)
})
}
const defaultToString = ((f?: V):string => String(!f ? '': f))
const defaultFromString = ((v: string):V => v as any)
const value = readField(object, String(name))
const initial = readField(initialObject, String(name))
const isDirty = value !== initial
const hasError = readField(errors, String(name))
return {
error: isDirty ? hasError : undefined,
required: !isDirty && hasError,
value,
initial,
onChange: updateField(name) as any,
toStr: toStr[name] ? toStr[name]! : defaultToString,
fromStr: fromStr[name] ? fromStr[name]! : defaultFromString,
}
}
/**
* read the field of an object an support accessing it using '.'
*
* @param object
* @param name
* @returns
*/
const readField = (object: any, name: string) => {
return name.split('.').reduce((prev, current) => prev && prev[current], object)
}
const setValueDeeper = (object: any, names: string[], value: any): any => {
if (names.length === 0) return value
const [head, ...rest] = names
return {...object, [head]: setValueDeeper(object[head] || {}, rest, value) }
}
export interface InputProps<T> {
name: T;
label: ComponentChildren;
placeholder?: string;
tooltip?: ComponentChildren;
readonly?: boolean;
help?: ComponentChildren;
}
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