// Vue 3 adapter (0.31.0) — `@pouchy_ai/companion-sdk/vue`.
// Thin binding of adapter-core onto a shallowRef; behavior lives (and is
// tested) in adapter-core.ts.
//
//   const { snapshot, sendText } = useCompanion(client);
//   snapshot.value.transcript / snapshot.value.streamState
//
// Inside a component/effect scope the subscription is torn down automatically
// (onScopeDispose); outside any scope, call dispose() yourself.

import { getCurrentScope, onScopeDispose, shallowRef, type ShallowRef } from 'vue';
import type { CompanionClient } from './client';
import {
	createCompanionView,
	type CompanionView,
	type CompanionViewOptions,
	type CompanionViewSnapshot
} from './adapter-core';

export interface UseCompanionReturn {
	/** Reactive, immutable view snapshot (replaced wholesale per change). */
	snapshot: ShallowRef<CompanionViewSnapshot>;
	sendText: CompanionView['sendText'];
	confirmAction: CompanionView['confirmAction'];
	/** Manual teardown for use outside an effect scope. */
	dispose(): void;
	client: CompanionClient;
}

/** Reactive companion view state for a host-owned client. */
export function useCompanion(
	client: CompanionClient,
	opts?: CompanionViewOptions
): UseCompanionReturn {
	const view = createCompanionView(client, opts);
	const snapshot = shallowRef(view.getSnapshot());
	const unsub = view.subscribe(() => {
		snapshot.value = view.getSnapshot();
	});
	const dispose = () => {
		unsub();
		view.dispose();
	};
	if (getCurrentScope()) onScopeDispose(dispose);
	return { snapshot, sendText: view.sendText, confirmAction: view.confirmAction, dispose, client };
}