'use client';

import { useForm } from 'react-hook-form';
import { zodResolver } from '@hookform/resolvers/zod';
import { z } from 'zod';
import { useRouter, useSearchParams } from 'next/navigation';
import { useAuthStore } from '@/lib/auth-store';
import { useState, Suspense } from 'react';
import Link from 'next/link';
import { Train, ShieldCheck, Eye, EyeOff } from 'lucide-react';

const loginSchema = z.object({
  // Accepts either an email or a phone number. Passengers who registered without an
  // email sign in with their phone number, which is sent in the same `email` field —
  // the IAM matches on either identifier.
  email: z.string().min(1, 'Phone or email is required'),
  password: z.string().min(6, 'Password must be at least 6 characters'),
});

type LoginForm = z.infer<typeof loginSchema>;

function LoginContent() {
  const router = useRouter();
  const searchParams = useSearchParams();
  const login = useAuthStore((s) => s.login);
  const [error, setError] = useState('');
  const [loading, setLoading] = useState(false);
  const [showPassword, setShowPassword] = useState(false);

  const { register, handleSubmit, formState: { errors } } = useForm<LoginForm>({
    resolver: zodResolver(loginSchema as any),
  });

  const onSubmit = async (data: LoginForm) => {
    setLoading(true);
    setError('');
    try {
      await login(data.email, data.password);
      const redirect = searchParams.get('redirect') || '/booking/search';
      router.push(redirect);
    } catch (err: any) {
      setError(err.response?.data?.message || 'Login failed. Please check your credentials.');
    } finally {
      setLoading(false);
    }
  };

  return (
    <div className="min-h-screen bg-gradient-to-br from-[rgb(20_113_76)] from-10% via-transparent to-[rgb(20_113_76)] to-90% dark:from-gray-900 dark:to-gray-800 flex items-center justify-center py-12 px-4">
      <div className="max-w-md w-full">
        <div className="text-center mb-8">
          <div className="flex justify-center mb-4">
            <div className="w-12 h-12 bg-[rgb(20_113_76)] rounded-lg flex items-center justify-center">
              <Train className="w-6 h-6 text-white" />
            </div>
          </div>
          <h1 className="text-3xl font-bold text-gray-900 dark:text-gray-100">Sign in</h1>
          <p className="text-gray-600 dark:text-gray-400 mt-2">Welcome back</p>
        </div>

        <div className="card">
          <form onSubmit={handleSubmit(onSubmit)} className="space-y-4">
            {error && (
              <div className="bg-red-50 dark:bg-red-900/30 border border-red-200 dark:border-red-800 text-red-700 dark:text-red-300 px-4 py-3 rounded">
                {error}
              </div>
            )}

            <div>
              <label className="block text-sm font-medium mb-1 text-gray-700 dark:text-gray-300">Phone or email</label>
              <input
                type="text"
                {...register('email')}
                className="input-field"
                placeholder="+251912345678 or your@email.com"
                autoComplete="username"
              />
              {errors.email && (
                <p className="text-red-500 text-sm mt-1">{errors.email.message}</p>
              )}
            </div>

            <div>
              <label className="block text-sm font-medium mb-1 text-gray-700 dark:text-gray-300">Password</label>
              <div className="relative">
                <input
                  type={showPassword ? 'text' : 'password'}
                  {...register('password')}
                  className="input-field pr-10"
                  placeholder="••••••••"
                />
                <button
                  type="button"
                  onClick={() => setShowPassword((v) => !v)}
                  className="absolute inset-y-0 right-0 flex items-center pr-3 text-gray-400 hover:text-gray-600 dark:hover:text-gray-200"
                  aria-label={showPassword ? 'Hide password' : 'Show password'}
                  tabIndex={-1}
                >
                  {showPassword ? <EyeOff className="w-5 h-5" /> : <Eye className="w-5 h-5" />}
                </button>
              </div>
              {errors.password && (
                <p className="text-red-500 text-sm mt-1">{errors.password.message}</p>
              )}
              <div className="flex justify-end mt-1">
                <Link
                  href="/forgot-password"
                  className="text-sm text-[rgb(20_113_76)] dark:text-emerald-400 hover:underline"
                >
                  Forgot password?
                </Link>
              </div>
            </div>

            <button type="submit" className="btn-primary w-full" disabled={loading}>
              {loading ? 'Signing in...' : 'Sign in'}
            </button>
          </form>

          <div className="mt-6 pt-4 border-t border-gray-200 dark:border-gray-700 space-y-3">
            <div className="text-center">
              <span className="text-sm text-gray-600 dark:text-gray-400">Don&apos;t have an account? </span>
              <Link href="/register" className="text-sm font-medium text-[rgb(20_113_76)] dark:text-emerald-400 hover:underline">
                Create account
              </Link>
            </div>
            <Link
              href="/fayda-setup"
              className="flex items-center justify-center gap-2 text-sm text-gray-600 dark:text-gray-400 hover:text-[rgb(20_113_76)] dark:hover:text-emerald-400 transition-colors"
            >
              <ShieldCheck className="w-4 h-4" />
              Already verified with Fayda? Set up your password
            </Link>
          </div>

          <div className="mt-4 text-center">
            <button
              onClick={() => router.push('/booking/search')}
              className="text-sm text-gray-600 dark:text-gray-400 hover:text-primary dark:hover:text-primary-400"
            >
              ← Back to booking
            </button>
          </div>
        </div>
      </div>
    </div>
  );
}

export default function LoginPage() {
  return (
      <Suspense fallback={
      <div className="min-h-screen bg-gradient-to-br from-[rgb(20_113_76)] from-10% via-transparent to-[rgb(20_113_76)] to-90% dark:from-gray-900 dark:to-gray-800 flex items-center justify-center">
        <div className="text-center">
          <div className="w-12 h-12 bg-white rounded-lg flex items-center justify-center mx-auto mb-4">
            <Train className="w-6 h-6 text-[rgb(20_113_76)]" />
          </div>
          <p className="text-gray-600 dark:text-gray-400">Loading...</p>
        </div>
      </div>
    }>
      <LoginContent />
    </Suspense>
  );
}