import { useEffect, useRef } from 'react';
import { useGameStore } from '@/store';
import { api, getAuthToken, setAuthToken, clearAuthToken, decodeTokenPayload } from '@/lib/api';
import { AUTO_SAVE_INTERVAL_TICKS } from '@ai-tycoon/shared';

export function useCloudSave() {
  const tickCount = useGameStore((s) => s.meta.tickCount);
  const companyName = useGameStore((s) => s.meta.companyName);
  const lastSaveTick = useRef(0);

  useEffect(() => {
    if (!companyName) return;
    if (tickCount - lastSaveTick.current < AUTO_SAVE_INTERVAL_TICKS * 5) return;

    const token = getAuthToken();
    if (!token) return;

    lastSaveTick.current = tickCount;

    const state = useGameStore.getState();
    const { activePage, notifications, ...gameState } = state;

    api.saves.put({
      companyName: state.meta.companyName,
      saveVersion: state.meta.saveVersion,
      gameData: gameState,
      tickCount: state.meta.tickCount,
      era: state.meta.currentEra,
    }).catch(() => {});
  }, [tickCount, companyName]);
}

export async function ensureAuth(): Promise<string | null> {
  const token = getAuthToken();
  if (token) {
    if (decodeTokenPayload(token)) return token;
    clearAuthToken();
  }

  try {
    const result = await api.auth.anonymous();
    setAuthToken(result.token);
    return result.token;
  } catch {
    return null;
  }
}