1 files changed, 81 insertions, 0 deletions
diff --git a/packages/merchant-backoffice-ui/src/components/form/FormProvider.tsx b/packages/merchant-backoffice-ui/src/components/form/FormProvider.tsx
new file mode 100644
index 000000000..aef410ce7
--- /dev/null
+++ b/packages/merchant-backoffice-ui/src/components/form/FormProvider.tsx
@@ -0,0 +1,81 @@
+/*
+ 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
+}