import { useState } from 'react';
import {
  Center,
  Container,
  Paper,
  Text,
  TextInput,
  PasswordInput,
  Button,
  Anchor,
  Stack,
  Alert,
} from '@mantine/core';
import { useForm } from '@mantine/form';
import { IconAlertCircle } from '@tabler/icons-react';
import { useNavigate, Link } from 'react-router-dom';
import api from '../../services/api';
import { useAuthStore } from '../../stores/authStore';
import logoSrc from '../../assets/logo.svg';

export function LoginPage() {
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState('');
  const navigate = useNavigate();
  const setAuth = useAuthStore((s) => s.setAuth);

  const form = useForm({
    initialValues: { email: '', password: '' },
    validate: {
      email: (v) => (/^\S+@\S+$/.test(v) ? null : 'Invalid email'),
      password: (v) => (v.length >= 1 ? null : 'Password required'),
    },
  });

  const handleSubmit = async (values: typeof form.values) => {
    setLoading(true);
    setError('');
    try {
      const { data } = await api.post('/auth/login', values);
      setAuth(data.accessToken, data.user, data.organizations);
      // Platform owner / superadmin with no orgs → admin panel
      if (data.user?.isSuperadmin && data.organizations.length === 0) {
        navigate('/admin');
      } else if (data.organizations.length >= 1) {
        // Always go through org selection to ensure correct JWT with orgSchema
        navigate('/select-org');
      } else {
        navigate('/');
      }
    } catch (err: any) {
      setError(err.response?.data?.message || 'Login failed');
    } finally {
      setLoading(false);
    }
  };

  return (
    <Container size={420} my={80}>
      <Center>
        <img src={logoSrc} alt="HOA LedgerIQ" style={{ height: 60 }} />
      </Center>
      <Text c="dimmed" size="sm" ta="center" mt={5}>
        Don&apos;t have an account?{' '}
        <Anchor component={Link} to="/register" size="sm">
          Register
        </Anchor>
      </Text>

      <Paper withBorder shadow="md" p={30} mt={30} radius="md">
        <form onSubmit={form.onSubmit(handleSubmit)}>
          <Stack>
            {error && (
              <Alert icon={<IconAlertCircle size={16} />} color="red" variant="light">
                {error}
              </Alert>
            )}
            <TextInput
              label="Email"
              placeholder="your@email.com"
              required
              {...form.getInputProps('email')}
            />
            <PasswordInput
              label="Password"
              placeholder="Your password"
              required
              {...form.getInputProps('password')}
            />
            <Button type="submit" fullWidth loading={loading}>
              Sign in
            </Button>
          </Stack>
        </form>
      </Paper>
    </Container>
  );
}