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/*
This file is part of GNU Taler
(C) 2022 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/>
*/
import { createElement, VNode } from "preact";
import { useCallback, useMemo } from "preact/hooks";
function getJsonIfOk(r: Response): Promise<any> {
if (r.ok) {
return r.json();
}
if (r.status >= 400 && r.status < 500) {
throw new Error(`URL may not be right: (${r.status}) ${r.statusText}`);
}
throw new Error(
`Try another server: (${r.status}) ${r.statusText || "internal server error"
}`,
);
}
export async function queryToSlashConfig<T>(url: string): Promise<T> {
return fetch(new URL("config", url).href)
.catch(() => {
throw new Error(`Network error`);
})
.then(getJsonIfOk);
}
function timeout<T>(ms: number, promise: Promise<T>): Promise<T> {
return new Promise((resolve, reject) => {
const timer = setTimeout(() => {
reject(
new Error(
`Timeout: the query took longer than ${Math.floor(ms / 1000)} secs`,
),
);
}, ms);
promise
.then((value) => {
clearTimeout(timer);
resolve(value);
})
.catch((reason) => {
clearTimeout(timer);
reject(reason);
});
});
}
export async function queryToSlashKeys<T>(url: string): Promise<T> {
const endpoint = new URL("keys", url);
const query = fetch(endpoint.href)
.catch(() => {
throw new Error(`Network error`);
})
.then(getJsonIfOk);
return timeout(3000, query);
}
export type StateFunc<S> = (p: S) => VNode | null;
export type StateViewMap<StateType extends { status: string }> = {
[S in StateType as S["status"]]: StateFunc<S>;
};
export type RecursiveState<S extends object> = S | (() => RecursiveState<S>);
export function compose<SType extends { status: string }, PType>(
name: string,
hook: (p: PType) => RecursiveState<SType>,
viewMap: StateViewMap<SType>,
): (p: PType) => VNode {
function withHook(stateHook: () => RecursiveState<SType>): () => VNode {
function TheComponent(): VNode {
//if the function is the same, do not compute
const state = stateHook();
if (typeof state === "function") {
const subComponent = withHook(state);
return createElement(subComponent, {});
}
const statusName = state.status as unknown as SType["status"];
const viewComponent = viewMap[statusName] as unknown as StateFunc<SType>;
return createElement(viewComponent, state);
}
// TheComponent.name = `${name}`;
return useMemo(() => {
return TheComponent
}, [stateHook]);
}
return (p: PType) => {
const h = withHook(() => hook(p));
return h();
};
}
export function assertUnreachable(x: never): never {
throw new Error("Didn't expect to get here");
}
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