import { useState, FormEvent } from 'react';
import { motion } from 'motion/react';
import { Lock, User, AlertCircle, ShieldCheck } from 'lucide-react';

interface AdminLoginProps {
  onLoginSuccess: (adminUsername: string) => void;
  onCancel: () => void;
}

export default function AdminLogin({ onLoginSuccess, onCancel }: AdminLoginProps) {
  const [username, setUsername] = useState('');
  const [password, setPassword] = useState('');
  const [error, setError] = useState('');
  const [isSubmitting, setIsSubmitting] = useState(false);

  const handleSubmit = async (e: FormEvent) => {
    e.preventDefault();
    setError('');
    setIsSubmitting(true);
    
    try {
      const response = await fetch('/api/login', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ username, password })
      });
      const data = await response.json();
      if (!response.ok) {
        throw new Error(data.error || 'Username atau Password salah.');
      }
      onLoginSuccess(data.name);
    } catch (err: any) {
      setError(err.message || 'Terjadi kesalahan koneksi ke server.');
    } finally {
      setIsSubmitting(false);
    }
  };

  return (
    <div id="admin-login-container" className="min-h-screen bg-slate-50 flex flex-col justify-center py-12 px-4 sm:px-6 lg:px-8 font-sans transition-colors duration-200">
      <motion.div
        initial={{ opacity: 0, y: -20 }}
        animate={{ opacity: 1, y: 0 }}
        transition={{ duration: 0.5 }}
        className="sm:mx-auto sm:w-full sm:max-w-md"
      >
        <div className="flex justify-center">
          <img 
            src="https://yptgkp.or.id/wp-content/uploads/2023/05/LOGO-TULISAN.jpg" 
            alt="Yayasan Perguruan Tinggi GKP" 
            className="h-16 md:h-20 object-contain rounded-2xl border border-slate-200 bg-white p-2.5 shadow-sm"
          />
        </div>
        <h2 id="login-title" className="mt-6 text-center text-3xl font-bold tracking-tight text-slate-900 dark:text-white">
          Portal Administrasi
        </h2>
        <p id="login-subtitle" className="mt-2 text-center text-sm text-slate-600 dark:text-slate-400">
          Urus data penilaian, cetak laporan Excel/PDF, & atur pengguna pimpinan
        </p>
      </motion.div>

      <motion.div
        initial={{ opacity: 0, scale: 0.95 }}
        animate={{ opacity: 1, scale: 1 }}
        transition={{ duration: 0.4, delay: 0.1 }}
        className="mt-8 sm:mx-auto sm:w-full sm:max-w-md"
      >
        <div className="bg-white dark:bg-slate-800 py-8 px-4 shadow-xl rounded-2xl sm:px-10 border border-slate-100 dark:border-slate-700/50">

          <form id="admin-login-form" className="space-y-6" onSubmit={handleSubmit}>
            <div>
              <label htmlFor="username" className="block text-sm font-medium text-slate-700 dark:text-slate-300">
                Username
              </label>
              <div className="mt-1 relative rounded-md shadow-sm">
                <div className="absolute inset-y-0 left-0 pl-3 flex items-center pointer-events-none text-slate-400">
                  <User className="h-5 w-5" />
                </div>
                <input
                  id="username"
                  name="username"
                  type="text"
                  required
                  value={username}
                  onChange={(e) => setUsername(e.target.value)}
                  className="block w-full pl-10 pr-3 py-2.5 border border-slate-300 dark:border-slate-600 rounded-xl bg-white dark:bg-slate-900 text-slate-900 dark:text-white placeholder-slate-400 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-blue-500 text-sm transition"
                  placeholder="Masukkan username admin"
                />
              </div>
            </div>

            <div>
              <label htmlFor="password" className="block text-sm font-medium text-slate-700 dark:text-slate-300">
                Password
              </label>
              <div className="mt-1 relative rounded-md shadow-sm">
                <div className="absolute inset-y-0 left-0 pl-3 flex items-center pointer-events-none text-slate-400">
                  <Lock className="h-5 w-5" />
                </div>
                <input
                  id="password"
                  name="password"
                  type="password"
                  required
                  value={password}
                  onChange={(e) => setPassword(e.target.value)}
                  className="block w-full pl-10 pr-3 py-2.5 border border-slate-300 dark:border-slate-600 rounded-xl bg-white dark:bg-slate-900 text-slate-900 dark:text-white placeholder-slate-400 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-blue-500 text-sm transition"
                  placeholder="••••••••"
                />
              </div>
            </div>

            {error && (
              <motion.div
                initial={{ opacity: 0, y: -10 }}
                animate={{ opacity: 1, y: 0 }}
                id="login-error-message"
                className="bg-rose-50 dark:bg-rose-950/20 border border-rose-200 dark:border-rose-800 p-3.5 rounded-xl flex items-start gap-2.5 text-xs text-rose-700 dark:text-rose-400"
              >
                <AlertCircle className="h-4 w-4 shrink-0 mt-0.5" />
                <span>{error}</span>
              </motion.div>
            )}

            <div className="flex gap-3">
              <button
                type="button"
                id="btn-login-cancel"
                onClick={onCancel}
                className="w-1/2 flex justify-center py-2.5 px-4 border border-slate-300 dark:border-slate-600 rounded-xl text-sm font-medium text-slate-700 dark:text-slate-300 bg-white dark:bg-slate-800 hover:bg-slate-50 dark:hover:bg-slate-700/60 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-slate-500 transition cursor-pointer"
              >
                Kembali ke Form
              </button>
              <button
                type="submit"
                id="btn-login-submit"
                disabled={isSubmitting}
                className="w-1/2 flex justify-center py-2.5 px-4 border border-transparent rounded-xl shadow-sm text-sm font-medium text-white bg-blue-600 hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500 disabled:opacity-50 transition cursor-pointer"
              >
                {isSubmitting ? 'Memproses...' : 'Masuk'}
              </button>
            </div>
          </form>
        </div>
        
        <div className="mt-8 text-center text-xs text-slate-500 dark:text-slate-600 flex items-center justify-center gap-1.5">
          <ShieldCheck className="h-4 w-4" />
          <span>Sistem Evaluasi Pimpinan IKI © 2026 Yayasan Perguruan Tinggi - GKP</span>
        </div>
      </motion.div>
    </div>
  );
}