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import type {
TAction,
TActionFunc,
TActionWithArgs,
TActionWithOptionalArgs,
TActionArgsMap,
TArgOfAction,
TInvocationTrigger,
} from "./types";
type ActionHandler = (arg: unknown, trigger?: TInvocationTrigger) => void;
const boundActions: Partial<Record<TAction, ActionHandler[]>> = {};
export function bindAction<A extends TAction>(
action: A,
handler: TActionFunc<A>,
) {
const handlers = boundActions[action];
const typedHandler = handler as ActionHandler;
if (handlers) {
handlers.push(typedHandler);
} else {
boundActions[action] = [typedHandler];
}
}
export function unbindAction<A extends TAction>(
action: A,
handler: TActionFunc<A>,
) {
const handlers = boundActions[action];
if (!handlers) return;
const typedHandler = handler as ActionHandler;
boundActions[action] = handlers.filter((h) => h !== typedHandler);
if (boundActions[action]?.length === 0) {
delete boundActions[action];
}
}
type InvokeActionFunc = {
(
action: TActionWithOptionalArgs,
args?: undefined,
trigger?: TInvocationTrigger,
): void;
<A extends TActionWithArgs>(
action: A,
args: TActionArgsMap[A],
trigger?: TInvocationTrigger,
): void;
};
export const invokeAction: InvokeActionFunc = <A extends TAction>(
action: A,
args?: TArgOfAction<A>,
trigger?: TInvocationTrigger,
) => {
boundActions[action]?.forEach((handler) => handler(args, trigger));
};
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