// Svelte adapter (0.31.0) — `@pouchy_ai/companion-sdk/svelte`.
// Implements the Svelte STORE CONTRACT (subscribe(run) → unsubscribe) by hand,
// so it needs no `svelte` import and works from Svelte 3 through 5 (`$store`
// auto-subscription, or `fromStore()` in runes mode). Behavior lives in
// adapter-core.ts.
//
//   const companion = companionStore(client);
//   $companion.transcript / $companion.draft / $companion.streamState
//   companion.sendText('hi');

import type { CompanionClient } from './client';
import {
	createCompanionView,
	type CompanionView,
	type CompanionViewOptions,
	type CompanionViewSnapshot
} from './adapter-core';

/** Svelte-store-contract readable of the companion view snapshot. */
export interface CompanionStore {
	/** Store contract: calls `run` with the current snapshot immediately and on
	 *  every change. Returns unsubscribe. */
	subscribe(run: (snapshot: CompanionViewSnapshot) => void): () => void;
	sendText: CompanionView['sendText'];
	confirmAction: CompanionView['confirmAction'];
	/** Detach from the client (does not close it). */
	dispose(): void;
	client: CompanionClient;
}

/** Wrap a host-owned client as a Svelte-compatible readable store. */
export function companionStore(
	client: CompanionClient,
	opts?: CompanionViewOptions
): CompanionStore {
	const view = createCompanionView(client, opts);
	return {
		subscribe(run) {
			run(view.getSnapshot());
			return view.subscribe(() => run(view.getSnapshot()));
		},
		sendText: view.sendText,
		confirmAction: view.confirmAction,
		dispose: view.dispose,
		client
	};
}