'use client';

import { useState, FormEvent } from 'react';
import { useRouter } from 'next/navigation';

export default function AdminLoginPage() {
  const router = useRouter();
  const [username, setUsername] = useState('');
  const [password, setPassword] = useState('');
  const [error, setError] = useState('');
  const [loading, setLoading] = useState(false);

  const handleSubmit = async (e: FormEvent) => {
    e.preventDefault();
    setError('');
    setLoading(true);
    try {
      const res = await fetch('/api/admin/login/', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ username, password }),
      });
      const data = await res.json();
      if (res.ok) {
        router.push('/admin/');
        router.refresh();
      } else {
        setError(data.error ?? 'Login failed');
      }
    } catch {
      setError('Network error. Please try again.');
    } finally {
      setLoading(false);
    }
  };

  return (
    <div style={pageStyle}>
      <div style={cardStyle}>
        <div style={{ textAlign: 'center', marginBottom: '2rem' }}>
          <div style={{
            width: '48px',
            height: '48px',
            borderRadius: '12px',
            background: 'rgba(59, 130, 246, 0.08)',
            border: '1px solid rgba(59, 130, 246, 0.2)',
            display: 'flex',
            alignItems: 'center',
            justifyContent: 'center',
            margin: '0 auto 1rem',
            fontSize: '1.25rem',
          }}>
            🔐
          </div>
          <h1 style={{ fontSize: '1.25rem', fontWeight: 700, color: '#1a1a2e', margin: 0, marginBottom: '0.25rem' }}>
            Admin Login
          </h1>
          <p style={{ fontSize: '0.8rem', color: '#94a3b8', margin: 0 }}>
            Lootah Robotics — G1 Configurator
          </p>
        </div>

        <form onSubmit={handleSubmit} style={{ display: 'flex', flexDirection: 'column', gap: '1rem' }}>
          <div>
            <label style={labelStyle} htmlFor="username">Username</label>
            <input
              id="username"
              type="text"
              autoComplete="username"
              required
              value={username}
              onChange={(e) => setUsername(e.target.value)}
              style={inputStyle}
              onFocus={(e) => (e.currentTarget.style.borderColor = 'rgba(59, 130, 246, 0.5)')}
              onBlur={(e) => (e.currentTarget.style.borderColor = 'rgba(0, 0, 0, 0.1)')}
              placeholder="admin"
            />
          </div>
          <div>
            <label style={labelStyle} htmlFor="password">Password</label>
            <input
              id="password"
              type="password"
              autoComplete="current-password"
              required
              value={password}
              onChange={(e) => setPassword(e.target.value)}
              style={inputStyle}
              onFocus={(e) => (e.currentTarget.style.borderColor = 'rgba(59, 130, 246, 0.5)')}
              onBlur={(e) => (e.currentTarget.style.borderColor = 'rgba(0, 0, 0, 0.1)')}
              placeholder="••••••••"
            />
          </div>

          {error && (
            <div style={{
              padding: '0.6rem 0.875rem',
              borderRadius: '0.375rem',
              background: 'rgba(239, 68, 68, 0.06)',
              border: '1px solid rgba(239, 68, 68, 0.2)',
              color: '#dc2626',
              fontSize: '0.8rem',
            }}>
              {error}
            </div>
          )}

          <button
            type="submit"
            disabled={loading}
            style={{
              padding: '0.7rem',
              borderRadius: '0.5rem',
              border: '1px solid rgba(59, 130, 246, 0.3)',
              background: loading ? 'rgba(148, 163, 184, 0.1)' : 'rgba(59, 130, 246, 0.08)',
              color: loading ? '#94a3b8' : '#2563eb',
              fontSize: '0.875rem',
              fontWeight: 600,
              cursor: loading ? 'not-allowed' : 'pointer',
              transition: 'all 0.2s ease',
              marginTop: '0.25rem',
            }}
          >
            {loading ? 'Signing in…' : 'Sign In'}
          </button>
        </form>
      </div>
    </div>
  );
}

const pageStyle: React.CSSProperties = {
  minHeight: '100vh',
  background: '#ffffff',
  display: 'flex',
  alignItems: 'center',
  justifyContent: 'center',
  padding: '2rem',
  fontFamily: 'system-ui, -apple-system, sans-serif',
};

const cardStyle: React.CSSProperties = {
  width: '100%',
  maxWidth: '380px',
  background: 'rgba(255, 255, 255, 0.95)',
  backdropFilter: 'blur(20px)',
  border: '1px solid rgba(0, 0, 0, 0.06)',
  borderRadius: '1rem',
  padding: '2rem',
};

const labelStyle: React.CSSProperties = {
  display: 'block',
  fontSize: '0.75rem',
  fontWeight: 600,
  color: '#374151',
  marginBottom: '0.375rem',
  letterSpacing: '0.02em',
};

const inputStyle: React.CSSProperties = {
  width: '100%',
  padding: '0.6rem 0.875rem',
  borderRadius: '0.5rem',
  border: '1px solid rgba(0, 0, 0, 0.1)',
  background: '#ffffff',
  color: '#1a1a2e',
  fontSize: '0.875rem',
  outline: 'none',
  transition: 'border-color 0.2s ease',
  boxSizing: 'border-box',
};