'use client';

import Link from 'next/link';
import { useRouter, useSearchParams } from 'next/navigation';
import { useState } from 'react';
import { Loader2 } from 'lucide-react';

import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Label } from '@/components/ui/label';

export default function PortalLoginPage() {
  const router = useRouter();
  const search = useSearchParams();
  const next = search.get('next') ?? '/portal/dashboard';

  const [email, setEmail] = useState('');
  const [password, setPassword] = useState('');
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState('');

  async function handleSubmit(e: React.FormEvent) {
    e.preventDefault();
    setError('');
    setLoading(true);

    try {
      const res = await fetch('/api/portal/auth/sign-in', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ email, password }),
      });

      if (!res.ok) {
        const data = await res.json().catch(() => ({}));
        setError((data as { error?: string }).error ?? 'Invalid email or password');
        return;
      }

      // typedRoutes: `next` is a runtime string we can't statically check.
      router.replace(next as never);
      router.refresh();
    } catch {
      setError('Unable to connect. Please try again.');
    } finally {
      setLoading(false);
    }
  }

  return (
    <div className="min-h-screen flex items-center justify-center bg-gray-50 px-4">
      <div className="w-full max-w-sm">
        <div className="bg-white rounded-lg border p-8 shadow-sm">
          <div className="text-center mb-6">
            <h1 className="text-xl font-semibold text-gray-900">Client Portal</h1>
            <p className="text-sm text-gray-500 mt-1">Sign in to your account</p>
          </div>

          <form onSubmit={handleSubmit} className="space-y-4">
            <div className="space-y-1.5">
              <Label htmlFor="email">Email address</Label>
              <Input
                id="email"
                type="email"
                placeholder="you@example.com"
                value={email}
                onChange={(e) => setEmail(e.target.value)}
                required
                autoFocus
                autoComplete="email"
                disabled={loading}
              />
            </div>

            <div className="space-y-1.5">
              <div className="flex items-center justify-between">
                <Label htmlFor="password">Password</Label>
                <Link
                  href="/portal/forgot-password"
                  className="text-xs text-[#1e2844] hover:underline"
                >
                  Forgot password?
                </Link>
              </div>
              <Input
                id="password"
                type="password"
                value={password}
                onChange={(e) => setPassword(e.target.value)}
                required
                autoComplete="current-password"
                disabled={loading}
              />
            </div>

            {error && <p className="text-sm text-red-600">{error}</p>}

            <Button
              type="submit"
              className="w-full bg-[#1e2844] hover:bg-[#1e2844]/90 text-white"
              disabled={loading || !email || !password}
            >
              {loading ? (
                <>
                  <Loader2 className="h-4 w-4 mr-2 animate-spin" />
                  Signing in…
                </>
              ) : (
                'Sign in'
              )}
            </Button>
          </form>
        </div>

        <p className="text-center text-xs text-gray-400 mt-4">
          This portal is for existing clients only.
        </p>
      </div>
    </div>
  );
}