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import { createElement, VNode } from "preact";
export type StateFunc<S> = (p: S) => VNode;
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>(
hook: (p: PType) => RecursiveState<SType>,
viewMap: StateViewMap<SType>,
): (p: PType) => VNode {
function withHook(stateHook: () => RecursiveState<SType>): () => VNode {
function ComposedComponent(): VNode {
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);
}
return ComposedComponent;
}
return (p: PType) => {
const h = withHook(() => hook(p));
return h();
};
}
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