/**
 * Sidebar 侧边栏导航组件 (桌面端)
 * 设计稿参考: UIDesignSpec.md 3.7
 */
import React from 'react';
import { LucideIcon } from 'lucide-react';

export interface SidebarItem {
  id: string;
  label: string;
  icon: LucideIcon;
  href?: string;
  badge?: number;
  children?: SidebarItem[];
}

export interface SidebarSection {
  title?: string;
  items: SidebarItem[];
}

export interface SidebarProps {
  logo?: React.ReactNode;
  sections: SidebarSection[];
  activeId: string;
  onItemClick?: (id: string) => void;
  footer?: React.ReactNode;
  className?: string;
}

export const Sidebar: React.FC<SidebarProps> = ({
  logo,
  sections,
  activeId,
  onItemClick,
  footer,
  className = '',
}) => {
  return (
    <aside
      className={`
        fixed left-0 top-0 bottom-0 z-sidebar
        w-sidebar bg-bg-card
        flex flex-col
        border-r border-border-subtle
        ${className}
      `}
    >
      {/* Logo */}
      {logo && (
        <div className="px-4 py-5 border-b border-border-subtle">
          {logo}
        </div>
      )}

      {/* Navigation */}
      <nav className="flex-1 overflow-y-auto py-4 px-3">
        {sections.map((section, sectionIndex) => (
          <div key={sectionIndex} className="mb-6">
            {section.title && (
              <h4 className="px-3 mb-2 text-small text-text-tertiary uppercase tracking-wider">
                {section.title}
              </h4>
            )}
            <ul className="space-y-1">
              {section.items.map((item) => (
                <SidebarNavItem
                  key={item.id}
                  item={item}
                  isActive={item.id === activeId}
                  onClick={() => onItemClick?.(item.id)}
                />
              ))}
            </ul>
          </div>
        ))}
      </nav>

      {/* Footer */}
      {footer && (
        <div className="px-4 py-4 border-t border-border-subtle">
          {footer}
        </div>
      )}
    </aside>
  );
};

interface SidebarNavItemProps {
  item: SidebarItem;
  isActive: boolean;
  onClick: () => void;
}

const SidebarNavItem: React.FC<SidebarNavItemProps> = ({
  item,
  isActive,
  onClick,
}) => {
  const Icon = item.icon;

  return (
    <li>
      <button
        onClick={onClick}
        className={`
          w-full flex items-center gap-2.5
          px-3 py-2.5 rounded-btn
          transition-colors duration-200
          ${isActive
            ? 'bg-bg-elevated text-accent-indigo font-semibold'
            : 'text-text-secondary hover:bg-bg-elevated'
          }
        `}
      >
        <Icon size={20} className="flex-shrink-0" />
        <span className="flex-1 text-left text-body">{item.label}</span>
        {item.badge !== undefined && item.badge > 0 && (
          <span
            className="
              min-w-[20px] h-5 px-1.5
              flex items-center justify-center
              bg-accent-coral text-white
              text-[11px] font-semibold
              rounded-full
            "
          >
            {item.badge > 99 ? '99+' : item.badge}
          </span>
        )}
      </button>
    </li>
  );
};

export default Sidebar;