'use client';

import { useState, type FormEvent } from 'react';
import { useRouter } from 'next/navigation';
import { Shield } from 'lucide-react';
import { useConfig } from '@/hooks/use-config';
import { useThemeStore } from '@/stores/theme-store';
import { apiFetch, withBasePath } from '@/lib/browser-navigation';

export default function AdminLoginPage() {
  const router = useRouter();
  const [password, setPassword] = useState('');
  const [error, setError] = useState('');
  const [loading, setLoading] = useState(false);
  const { loginLogoLightUrl, loginLogoDarkUrl } = useConfig();
  const resolvedTheme = useThemeStore((s) => s.resolvedTheme);
  const logoUrl = withBasePath(resolvedTheme === 'dark' ? loginLogoDarkUrl : loginLogoLightUrl);

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

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

      const data = await res.json();

      if (!res.ok) {
        setError(data.error || 'Login failed');
        return;
      }

      router.push('/admin');
    } catch {
      setError('Network error. Please try again.');
    } finally {
      setLoading(false);
    }
  }

  return (
    <div className="min-h-screen flex items-center justify-center bg-background px-4">
      <div className="w-full max-w-sm">
        <div className="flex flex-col items-center mb-8">
          {logoUrl ? (
            <img src={logoUrl} alt="" className="h-12 object-contain mb-4" />
          ) : (
            <div className="w-12 h-12 rounded-xl bg-primary/10 flex items-center justify-center mb-4">
              <Shield className="w-6 h-6 text-primary" />
            </div>
          )}
          <h1 className="text-xl font-semibold text-foreground">Admin Dashboard</h1>
          <p className="text-sm text-muted-foreground mt-1">Enter your admin password to continue</p>
        </div>

        <form onSubmit={handleSubmit} className="space-y-4">
          <div>
            <label htmlFor="password" className="block text-sm font-medium text-foreground mb-1.5">
              Password
            </label>
            <input
              id="password"
              type="password"
              value={password}
              onChange={(e) => setPassword(e.target.value)}
              className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm text-foreground transition-all duration-200 placeholder:text-muted-foreground hover:border-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:border-ring"
              placeholder="Enter admin password"
              required
              autoFocus
              autoComplete="current-password"
            />
          </div>

          {error && (
            <div className="text-sm text-destructive bg-destructive/10 rounded-md px-3 py-2">
              {error}
            </div>
          )}

          <button
            type="submit"
            disabled={loading || !password}
            className="w-full h-10 rounded-md bg-primary text-primary-foreground font-medium text-sm hover:bg-primary/90 disabled:opacity-50 disabled:pointer-events-none transition-all duration-200 shadow-sm"
          >
            {loading ? 'Signing in...' : 'Sign in'}
          </button>
        </form>
      </div>
    </div>
  );
}
