import {
  Paper,
  TextInput,
  Button,
  Stack,
  Title,
  Text,
  Anchor,
} from '@mantine/core';
import { useForm } from 'react-hook-form';
import { zodResolver } from '@hookform/resolvers/zod';
import { z } from 'zod';
import { useNavigate, Link } from 'react-router-dom';
import { useAppDispatch, useAppSelector } from '../../../store/hooks';
import { signupStart, signupSuccess, signupFailure } from '../store/signup.slice';
import { hydrateAuth } from '../store/auth.slice';
import { authStorage } from '../utils/auth-storage';
import { notify } from '@ema-platform/ui';

const BASE_API_URL =
  (import.meta as { env?: Record<string, string> }).env?.['VITE_BASE_API_URL'] ??
  'http://localhost:3001/api';

const schema = z.object({
  email: z.string().email('Enter a valid email'),
  username: z.string().min(3, 'Username must be at least 3 characters'),
  phoneNumber: z.string().min(1, 'Phone number is required'),
  userType: z.string().min(1, 'User type is required'),
  name: z.string().min(1, 'Name is required'),
});

type FormValues = z.infer<typeof schema>;

interface SignupPayload {
  email: string;
  username: string;
  phoneNumber: string;
  userType: string;
  name: {
    am: string;
    en: string;
  };
}

export function SignupPage() {
  const navigate = useNavigate();
  const dispatch = useAppDispatch();
  const { loading } = useAppSelector((s) => s.signup);

  const {
    register,
    handleSubmit,
    formState: { errors },
  } = useForm<FormValues>({
    resolver: zodResolver(schema),
  });

  const onSubmit = async (values: FormValues) => {
    dispatch(signupStart());
    try {
      const payload: SignupPayload = {
        email: values.email,
        username: values.username,
        phoneNumber: values.phoneNumber,
        userType: values.userType,
        name: {
          am: '',
          en: values.name,
        },
      };

      const res = await fetch(`${BASE_API_URL}/auth/signup`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(payload),
      });

      if (!res.ok) {
        const errorData = await res.json().catch(() => null);
        throw new Error(errorData?.message ?? 'Signup failed');
      }

      const data = (await res.json()) as { token: string; refreshToken: string };

      authStorage.setToken(data.token);
      authStorage.setRefreshToken(data.refreshToken);
      dispatch(hydrateAuth());
      dispatch(signupSuccess());

      navigate('/set-password', { state: { email: values.email } });
    } catch (err) {
      const msg = err instanceof Error ? err.message : 'Something went wrong';
      dispatch(signupFailure(msg));
      notify.error(msg);
    }
  };

  return (
    <Paper p="xl" shadow="md" radius="md">
      <Stack gap="lg">
        <Stack gap={4}>
          <Title order={2}>Create an account</Title>
          <Text c="dimmed" size="sm">
            Fill in your details to get started
          </Text>
        </Stack>
        <form onSubmit={handleSubmit(onSubmit)}>
          <Stack gap="md">
            <TextInput
              label="Full Name"
              placeholder="Your full name"
              error={errors.name?.message}
              {...register('name')}
            />
            <TextInput
              label="Email"
              placeholder="you@example.com"
              error={errors.email?.message}
              {...register('email')}
            />
            <TextInput
              label="Username"
              placeholder="Choose a username"
              error={errors.username?.message}
              {...register('username')}
            />
            <TextInput
              label="Phone Number"
              placeholder="+251 911 234 567"
              error={errors.phoneNumber?.message}
              {...register('phoneNumber')}
            />
            <TextInput
              label="User Type"
              placeholder="e.g. admin, manager"
              error={errors.userType?.message}
              {...register('userType')}
            />
            <Button type="submit" loading={loading} fullWidth mt="sm">
              Sign up
            </Button>
          </Stack>
        </form>
        <Text ta="center" size="sm" c="dimmed">
          Already have an account?{' '}
          <Anchor component={Link} to="/login">
            Sign in
          </Anchor>
        </Text>
      </Stack>
    </Paper>
  );
}