import { writable, derived } from "svelte/store";
import type * as GAME from "vibegame";

type GameInstance = Awaited<ReturnType<typeof GAME.run>>;

export interface GameState {
  instance: GameInstance | null;
  isRunning: boolean;
  isStarting: boolean;
  isAutoRunning: boolean;
}

function createGameStore() {
  const { subscribe, set, update } = writable<GameState>({
    instance: null,
    isRunning: false,
    isStarting: false,
    isAutoRunning: true,
  });

  return {
    subscribe,
    setInstance: (instance: GameInstance | null) =>
      update((state) => ({
        ...state,
        instance,
        isRunning: instance !== null,
      })),
    setStarting: (isStarting: boolean) =>
      update((state) => ({
        ...state,
        isStarting,
      })),
    setAutoRunning: (isAutoRunning: boolean) =>
      update((state) => ({
        ...state,
        isAutoRunning,
      })),
    reset: () =>
      set({
        instance: null,
        isRunning: false,
        isStarting: false,
        isAutoRunning: true,
      }),
  };
}

export const gameStore = createGameStore();
export const isGameRunning = derived(gameStore, ($game) => $game.isRunning);