/**
 * HandList - 左侧导航的 Hands 列表
 *
 * 显示所有可用的 Hands（自主能力包），
 * 允许用户选择一个 Hand 来查看其任务和结果。
 */

import { useEffect } from 'react';
import { useGatewayStore, type Hand } from '../store/gatewayStore';
import { Zap, Loader2, RefreshCw, CheckCircle, XCircle, AlertTriangle } from 'lucide-react';

interface HandListProps {
  selectedHandId?: string;
  onSelectHand?: (handId: string) => void;
}

// 状态图标
function HandStatusIcon({ status }: { status: Hand['status'] }) {
  switch (status) {
    case 'running':
      return <Loader2 className="w-3.5 h-3.5 text-blue-500 animate-spin" />;
    case 'needs_approval':
      return <AlertTriangle className="w-3.5 h-3.5 text-yellow-500" />;
    case 'error':
      return <XCircle className="w-3.5 h-3.5 text-red-500" />;
    case 'setup_needed':
    case 'unavailable':
      return <AlertTriangle className="w-3.5 h-3.5 text-orange-500" />;
    default:
      return <CheckCircle className="w-3.5 h-3.5 text-green-500" />;
  }
}

// 状态标签
const STATUS_LABELS: Record<Hand['status'], string> = {
  idle: '就绪',
  running: '运行中',
  needs_approval: '待审批',
  error: '错误',
  unavailable: '不可用',
  setup_needed: '需配置',
};

export function HandList({ selectedHandId, onSelectHand }: HandListProps) {
  const { hands, loadHands, isLoading } = useGatewayStore();

  useEffect(() => {
    loadHands();
  }, [loadHands]);

  if (isLoading && hands.length === 0) {
    return (
      <div className="p-4 text-center">
        <Loader2 className="w-5 h-5 animate-spin mx-auto text-gray-400 mb-2" />
        <p className="text-xs text-gray-400">加载中...</p>
      </div>
    );
  }

  if (hands.length === 0) {
    return (
      <div className="p-4 text-center">
        <Zap className="w-8 h-8 mx-auto text-gray-300 mb-2" />
        <p className="text-xs text-gray-400 mb-1">暂无可用 Hands</p>
        <p className="text-xs text-gray-300">连接 OpenFang 后显示</p>
      </div>
    );
  }

  return (
    <div className="flex flex-col h-full">
      {/* 头部 */}
      <div className="p-3 border-b border-gray-200 flex items-center justify-between">
        <div>
          <h3 className="text-xs font-semibold text-gray-700">自主能力包</h3>
          <p className="text-xs text-gray-400">{hands.length} 个可用</p>
        </div>
        <button
          onClick={() => loadHands()}
          disabled={isLoading}
          className="p-1.5 text-gray-400 hover:text-gray-600 hover:bg-gray-100 rounded transition-colors disabled:opacity-50"
          title="刷新"
        >
          <RefreshCw className={`w-3.5 h-3.5 ${isLoading ? 'animate-spin' : ''}`} />
        </button>
      </div>

      {/* Hands 列表 */}
      <div className="flex-1 overflow-y-auto">
        {hands.map((hand) => (
          <button
            key={hand.id}
            onClick={() => onSelectHand?.(hand.id)}
            className={`w-full text-left p-3 border-b border-gray-100 hover:bg-gray-100 transition-colors ${
              selectedHandId === hand.id ? 'bg-blue-50 border-l-2 border-l-blue-500' : ''
            }`}
          >
            <div className="flex items-start gap-2">
              <span className="text-lg flex-shrink-0">{hand.icon || '🤖'}</span>
              <div className="flex-1 min-w-0">
                <div className="flex items-center gap-1.5">
                  <span className="font-medium text-gray-800 text-sm truncate">
                    {hand.name}
                  </span>
                  <HandStatusIcon status={hand.status} />
                </div>
                <p className="text-xs text-gray-400 truncate mt-0.5">
                  {hand.description}
                </p>
                <div className="flex items-center gap-2 mt-1">
                  <span className="text-xs text-gray-400">
                    {STATUS_LABELS[hand.status]}
                  </span>
                  {hand.toolCount !== undefined && (
                    <span className="text-xs text-gray-300">
                      {hand.toolCount} 工具
                    </span>
                  )}
                </div>
              </div>
            </div>
          </button>
        ))}
      </div>
    </div>
  );
}

export default HandList;