import { useState } from 'react';
import Box from '@mui/material/Box';
import Button from '@mui/material/Button';
import Card from '@mui/material/Card';
import CardContent from '@mui/material/CardContent';
import Stack from '@mui/material/Stack';
import Typography from '@mui/material/Typography';
import GoogleIcon from '@mui/icons-material/Google';
import { useSnackbar } from 'notistack';
import { useAuth } from '../auth/useAuth';
import { requestGoogleIdToken } from '../auth/googleSignIn';

export default function LoginPage() {
  const { loginWithGoogle, googleClientId, status } = useAuth();
  const { enqueueSnackbar } = useSnackbar();
  const [busy, setBusy] = useState(false);

  const handleLogin = async () => {
    setBusy(true);
    try {
      const idToken = await requestGoogleIdToken(googleClientId);
      await loginWithGoogle(idToken);
    } catch (err) {
      enqueueSnackbar(`Login failed: ${err.message}`, { variant: 'error' });
    } finally {
      setBusy(false);
    }
  };

  const loading = status === 'loading';
  const ready = Boolean(googleClientId);

  return (
    <Box
      sx={{
        display: 'flex',
        alignItems: 'center',
        justifyContent: 'center',
        minHeight: '100vh',
        bgcolor: 'grey.100',
      }}
    >
      <Button
        variant="contained"
        size="large"
        startIcon={<GoogleIcon />}
        disabled={busy || loading || !ready}
        onClick={handleLogin}
      >
        {busy ? 'Signing in…' : 'Sign in with Google'}
      </Button>
    </Box>
  );
}