'use client';

import { signIn, useSession } from '@/lib/better-auth';
import { useRouter } from 'next/navigation';
import { useEffect, useState } from 'react';

export default function SignIn() {
  const { data: session, isPending: sessionPending } = useSession();
  const router = useRouter();

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

  useEffect(() => {
    if (!sessionPending && session?.user) {
      router.replace('/');
    }
  }, [sessionPending, session, router]);

  const handleCredentialsLogin = async (e: React.FormEvent) => {
    e.preventDefault();
    setLoading(true);
    setError('');

    try {
      const result = await signIn.email({
        email,
        password,
      });

      if (result.error) {
        setError(result.error.message || 'Invalid credentials');
        return;
      }

      router.replace('/');
      router.refresh();
    } catch (err) {
      setError('Login failed');
    } finally {
      setLoading(false);
    }
  };

  return (
    <div className="min-h-screen bg-gradient-to-br from-slate-900 to-slate-800 flex items-center justify-center p-4">
      <div className="max-w-md w-full bg-slate-800/50 rounded-lg p-8 border border-slate-700">
        <h1 className="text-3xl font-bold text-center mb-2 bg-gradient-to-r from-blue-400 to-purple-500 bg-clip-text text-transparent">
          Fiscal Clone
        </h1>
        <p className="text-slate-400 text-center mb-8">Sign in to your account</p>

        {error && (
          <div className="bg-red-500/20 border border-red-500 text-red-400 px-4 py-3 rounded-lg mb-6">
            {error}
          </div>
        )}

        <form onSubmit={handleCredentialsLogin} className="space-y-4">
          <div>
            <label className="block text-sm font-medium text-slate-300 mb-2">
              Email
            </label>
            <input
              type="email"
              value={email}
              onChange={(e) => setEmail(e.target.value)}
              className="w-full bg-slate-700/50 border border-slate-600 rounded-lg px-4 py-3 text-white placeholder-slate-400 focus:outline-none focus:ring-2 focus:ring-blue-500"
              placeholder="you@example.com"
              required
            />
          </div>

          <div>
            <label className="block text-sm font-medium text-slate-300 mb-2">
              Password
            </label>
            <input
              type="password"
              value={password}
              onChange={(e) => setPassword(e.target.value)}
              className="w-full bg-slate-700/50 border border-slate-600 rounded-lg px-4 py-3 text-white placeholder-slate-400 focus:outline-none focus:ring-2 focus:ring-blue-500"
              placeholder="•••••••••"
              required
              minLength={8}
            />
          </div>

          <button
            type="submit"
            disabled={loading || sessionPending}
            className="w-full bg-gradient-to-r from-blue-500 to-purple-500 hover:from-blue-600 hover:to-purple-600 text-white font-semibold py-3 rounded-lg transition disabled:opacity-50 disabled:cursor-not-allowed"
          >
            {loading ? 'Signing in...' : 'Sign In'}
          </button>
        </form>

        <p className="mt-8 text-center text-sm text-slate-400">
          Don&apos;t have an account?{' '}
          <a href="/auth/signup" className="text-blue-400 hover:text-blue-300">
            Sign up
          </a>
        </p>
      </div>
    </div>
  );
}