import { useState } from 'react';
import {
  Anchor,
  Button,
  Checkbox,
  Divider,
  Group,
  PasswordInput,
  Stack,
  Text,
  TextInput,
  Title,
} from '@mantine/core';
import {
  IconArrowRight,
  IconDeviceMobile,
  IconLock,
  IconMail,
} from '@tabler/icons-react';
import { useForm } from 'react-hook-form';
import { zodResolver } from '@hookform/resolvers/zod';
import { z } from 'zod';
import { useNavigate, Link } from 'react-router-dom';
import { useDispatch } from 'react-redux';
import { useApiMutation } from '@ema-platform/api';
import { notify } from '@ema-platform/ui';
import { AuthShell } from '../components/AuthShell';
import { loginSuccess, setUser } from '../store/auth.slice';
import type { LoginPayload, AuthUser } from '../types/auth.types';
import { useAuthConfig } from '../AuthConfig';
import { authStorage } from '../utils/auth-storage';

const schema = z.object({
  email: z.string().email({ message: 'Enter a valid email' }),
  password: z.string().min(5, { message: 'Password must be at least 6 characters' }),
});

type FormValues = z.infer<typeof schema>;

export function LoginPage() {
  const navigate = useNavigate();
  const dispatch = useDispatch();
  const { appName, loginRedirectPath, enableSignup, enableForgotPassword } =
    useAuthConfig();
  const [isLoading, setIsLoading] = useState(false);
  const [rememberMe, setRememberMe] = useState(true);
  const [loginTrigger] = useApiMutation<LoginPayload>();
  const [meTrigger] = useApiMutation<AuthUser>();
  const [profileCheckTrigger] = useApiMutation<{ total: number; items: Array<{ id: string; user: { id: string }; isComplete: boolean }> }>();

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

  const onSubmit = async (values: FormValues) => {
    setIsLoading(true);
    try {
      const data = await loginTrigger({
        url: '/auth/login',
        method: 'POST',
        body: values,
      }).unwrap();
      dispatch(loginSuccess(data));

      const me = await meTrigger({
        url: '/auth/me',
        method: 'GET',
      }).unwrap();
      dispatch(setUser(me));

      try {
        const profiles = await profileCheckTrigger({
          url: `/profiles?q=${encodeURIComponent('i=user')}`,
          method: 'GET',
        }).unwrap();
        const userProfile = profiles.items?.find((p) => p.user?.id === me.id);

        if (userProfile?.isComplete) {
          authStorage.setProfileId(userProfile.id);
        } else {
          navigate('/profile-setup');
          return;
        }
      } catch {
        navigate('/profile-setup');
        return;
      }

      if (me.isPhoneNumberVerified) {
        navigate(loginRedirectPath);
      } else {
        navigate('/otp-verify', {
          state: { email: me.email, phoneNumber: me.phoneNumber },
        });
      }
    } catch {
      notify.error('Invalid email or password');
    } finally {
      setIsLoading(false);
    }
  };

  return (
    <AuthShell>
      <Stack gap="lg">
        <div>
          <Title order={2} fz={30}>
            Welcome to {appName}
          </Title>
          <Text c="dimmed" mt={6}>
            Sign in to access your account.
          </Text>
        </div>

        <form onSubmit={handleSubmit(onSubmit)}>
          <Stack gap="md">
            <TextInput
              label="Email or phone"
              placeholder="you@example.com"
              size="md"
              leftSection={<IconMail size={18} />}
              error={errors.email?.message}
              {...register('email')}
            />
            <PasswordInput
              label="Password"
              placeholder="Your password"
              size="md"
              leftSection={<IconLock size={18} />}
              error={errors.password?.message}
              {...register('password')}
            />

            <Group justify="space-between">
              <Checkbox
                label="Remember me"
                size="sm"
                checked={rememberMe}
                onChange={(e) => setRememberMe(e.currentTarget.checked)}
              />
              {enableForgotPassword && (
                <Anchor
                  component={Link}
                  to="/forgot-password"
                  size="sm"
                  fw={600}
                >
                  Forgot password?
                </Anchor>
              )}
            </Group>

            <Button
              type="submit"
              loading={isLoading}
              fullWidth
              size="md"
              rightSection={<IconArrowRight size={18} />}
            >
              Sign in
            </Button>
          </Stack>
        </form>

        <Divider label="or" labelPosition="center" />

        <Button
          variant="default"
          fullWidth
          size="md"
          leftSection={<IconDeviceMobile size={18} />}
          onClick={() => notify.info('Phone sign-in is coming soon.')}
        >
          Sign in with phone number
        </Button>

        {enableSignup && (
          <Text ta="center" size="sm" c="dimmed">
            Don&apos;t have an account?{' '}
            <Anchor component={Link} to="/signup" fw={700}>
              Create one
            </Anchor>
          </Text>
        )}
      </Stack>
    </AuthShell>
  );
}