import { chatStore } from "./chatStore.svelte.js";

// keyed by chat_id → chatStore instance
const cache = $state({});

// which chat is on screen right now
export const activeChatId = $state(null);

export function getStore(chatId) {
  if (!cache[chatId]) {
    cache[chatId] = chatStore(chatId);
  }
  return cache[chatId];
}

export function switchChat(chatId) {
  activeChatId = chatId;
}

export function newChat() {
  const id = "chat_" + crypto.randomUUID();
  switchChat(id);
  return id;
}

// restore last opened chat (or create first one)
(() => {
  const ids = JSON.parse(localStorage.getItem("chat_ids") || "[]");
  if (ids.length) switchChat(ids[0]);
  else newChat();
})();