'use client';
import { cn } from '@/lib/cn';

export function PageHeader({ title, subtitle, right }: { title: string; subtitle?: string; right?: React.ReactNode }) {
  return (
    <div className="flex items-end justify-between border-b border-slate-200 pb-3 mb-5">
      <div>
        <h1 className="text-xl font-bold text-slate-900">{title}</h1>
        {subtitle && <p className="text-xs text-slate-500 mt-1">{subtitle}</p>}
      </div>
      {right && <div>{right}</div>}
    </div>
  );
}

export function Card({ className, children }: { className?: string; children: React.ReactNode }) {
  return (
    <div className={cn('bg-white rounded-xl border border-slate-200 shadow-sm p-5', className)}>
      {children}
    </div>
  );
}

export function CardHeader({ icon: Icon, title, hint }: any) {
  return (
    <div className="flex items-center gap-2 mb-3">
      {Icon && <Icon size={16} className="text-blue-600" />}
      <span className="text-sm font-bold text-slate-800">{title}</span>
      {hint && <span className="text-xs text-slate-400">· {hint}</span>}
    </div>
  );
}

export function Input({ label, ...props }: any) {
  return (
    <label className="block">
      {label && <span className="block text-xs font-medium text-slate-600 mb-1">{label}</span>}
      <input
        {...props}
        className={cn(
          'w-full px-3 py-2 text-sm rounded-md border border-slate-300 bg-slate-50',
          'focus:outline-none focus:ring-2 focus:ring-blue-500 focus:bg-white',
          'placeholder:text-slate-400 disabled:bg-slate-100 disabled:text-slate-500',
          props.className,
        )}
      />
    </label>
  );
}

export function Select({ label, children, ...props }: any) {
  return (
    <label className="block">
      {label && <span className="block text-xs font-medium text-slate-600 mb-1">{label}</span>}
      <select {...props} className={cn(
        'w-full px-3 py-2 text-sm rounded-md border border-slate-300 bg-slate-50',
        'focus:outline-none focus:ring-2 focus:ring-blue-500 focus:bg-white',
        props.className,
      )}>
        {children}
      </select>
    </label>
  );
}

export function Button({ variant = 'primary', size = 'md', className, children, ...props }: any) {
  const variants: Record<string, string> = {
    primary:   'bg-blue-600 hover:bg-blue-700 text-white shadow-sm',
    secondary: 'bg-slate-100 hover:bg-slate-200 text-slate-800 border border-slate-300',
    ghost:     'bg-transparent hover:bg-slate-100 text-slate-700',
    danger:    'bg-red-600 hover:bg-red-700 text-white',
  };
  const sizes: Record<string, string> = {
    sm: 'px-2.5 py-1 text-xs',
    md: 'px-4 py-2 text-sm',
    lg: 'px-5 py-2.5 text-base',
  };
  return (
    <button
      {...props}
      className={cn(
        'rounded-md font-medium transition-colors disabled:opacity-50 disabled:cursor-not-allowed',
        variants[variant],
        sizes[size],
        className,
      )}
    >
      {children}
    </button>
  );
}

export function Toggle({ checked, onChange, label }: any) {
  return (
    <label className="inline-flex items-center gap-2 cursor-pointer">
      <span className="relative">
        <input type="checkbox" checked={checked} onChange={(e) => onChange(e.target.checked)} className="sr-only peer" />
        <div className="w-9 h-5 bg-slate-300 rounded-full peer-checked:bg-blue-600 transition" />
        <div className="absolute left-0.5 top-0.5 w-4 h-4 bg-white rounded-full shadow transition peer-checked:translate-x-4" />
      </span>
      <span className="text-sm text-slate-700">{label}</span>
    </label>
  );
}

export function Banner({ level = 'info', children }: { level: 'info' | 'success' | 'warning' | 'danger'; children: React.ReactNode }) {
  const styles: Record<string, string> = {
    info:    'bg-blue-50 border-blue-200 text-blue-800',
    success: 'bg-green-50 border-green-200 text-green-800',
    warning: 'bg-yellow-50 border-yellow-200 text-yellow-800',
    danger:  'bg-red-50 border-red-200 text-red-800',
  };
  return (
    <div className={cn('border rounded-lg px-4 py-3 text-sm', styles[level])}>
      {children}
    </div>
  );
}

export function Stat({ label, value, hint }: { label: string; value: any; hint?: string }) {
  return (
    <div className="bg-white rounded-xl border border-slate-200 p-4 shadow-sm">
      <div className="text-xs text-slate-500 mb-1">{label}</div>
      <div className="text-xl font-bold text-slate-900">{value}</div>
      {hint && <div className="text-xs text-slate-400 mt-1">{hint}</div>}
    </div>
  );
}