cosmo/frontend/src/components/Header.tsx

/**
 * Header component - application header with navigation and controls
 */
import { useState } from 'react';

interface HeaderProps {
  isTimelineMode: boolean;
  onToggleTimeline: () => void;
  bodyCount: number;
  selectedBodyName?: string;
}

export function Header({
  isTimelineMode,
  onToggleTimeline,
  bodyCount,
  selectedBodyName
}: HeaderProps) {
  const [showLoginModal, setShowLoginModal] = useState(false);

  return (
    <>
      <header className="absolute top-0 left-0 right-0 z-50 bg-gradient-to-b from-black via-black/80 to-transparent backdrop-blur-sm">
        <div className="flex items-center justify-between px-6 py-4">
          {/* Left: Logo and Title */}
          <div className="flex items-center gap-4">
            <div className="flex items-center gap-3">
              <div className="w-10 h-10 rounded-full bg-gradient-to-br from-blue-500 to-purple-600 flex items-center justify-center">
                <span className="text-2xl">🌌</span>
              </div>
              <div>
                <h1 className="text-2xl font-bold text-white tracking-tight">Cosmo</h1>
                <p className="text-xs text-gray-400">宇宙星空可视化平台</p>
              </div>
            </div>

            {/* Status Info */}
            <div className="ml-6 px-3 py-1.5 bg-white/5 rounded-lg border border-white/10">
              <p className="text-xs text-gray-300">
                {selectedBodyName ? (
                  <>
                    <span className="text-cyan-400">●</span> 聚焦: <span className="text-white font-medium">{selectedBodyName}</span>
                  </>
                ) : (
                  <>
                    <span className="text-green-400">●</span> {bodyCount} 个天体
                  </>
                )}
              </p>
            </div>
          </div>

          {/* Right: Controls */}
          <div className="flex items-center gap-3">
            {/* Timeline Mode Toggle */}
            <button
              onClick={onToggleTimeline}
              className={`
                group relative px-4 py-2 rounded-lg font-medium text-sm transition-all duration-200
                ${
                  isTimelineMode
                    ? 'bg-blue-600 text-white border-2 border-blue-400 shadow-lg shadow-blue-500/50'
                    : 'bg-white/5 text-gray-300 border border-white/10 hover:bg-white/10 hover:border-white/20'
                }
              `}
            >
              <div className="flex items-center gap-2">
                <span className="text-lg">📅</span>
                <span>{isTimelineMode ? '时间轴已启用' : '启用时间轴'}</span>
              </div>

              {/* Tooltip */}
              {!isTimelineMode && (
                <div className="absolute top-full right-0 mt-2 px-3 py-2 bg-gray-900 text-white text-xs rounded-lg shadow-xl opacity-0 group-hover:opacity-100 transition-opacity pointer-events-none whitespace-nowrap">
                  查看天体历史运动轨迹
                </div>
              )}
            </button>

            {/* Login Button */}
            <button
              onClick={() => setShowLoginModal(true)}
              className="px-4 py-2 rounded-lg font-medium text-sm bg-white/5 text-gray-300 hover:bg-white/10 border border-white/10 transition-all duration-200"
            >
              <div className="flex items-center gap-2">
                <span className="text-lg">👤</span>
                <span>登录</span>
              </div>
            </button>
          </div>
        </div>

      </header>

      {/* Login Modal */}
      {showLoginModal && (
        <div
          className="fixed inset-0 z-[100] flex items-center justify-center bg-black/70 backdrop-blur-sm"
          onClick={() => setShowLoginModal(false)}
        >
          <div
            className="bg-gray-900 rounded-2xl p-8 max-w-md w-full mx-4 shadow-2xl border border-gray-700"
            onClick={(e) => e.stopPropagation()}
          >
            <div className="flex items-center justify-between mb-6">
              <h2 className="text-2xl font-bold text-white">登录 Cosmo</h2>
              <button
                onClick={() => setShowLoginModal(false)}
                className="text-gray-400 hover:text-white transition-colors"
              >
                <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
                </svg>
              </button>
            </div>

            <div className="space-y-4">
              <div>
                <label className="block text-sm font-medium text-gray-300 mb-2">
                  邮箱或用户名
                </label>
                <input
                  type="text"
                  placeholder="请输入邮箱或用户名"
                  className="w-full px-4 py-3 bg-gray-800 border border-gray-600 rounded-lg text-white placeholder-gray-500 focus:outline-none focus:border-blue-500 transition-colors"
                />
              </div>

              <div>
                <label className="block text-sm font-medium text-gray-300 mb-2">
                  密码
                </label>
                <input
                  type="password"
                  placeholder="请输入密码"
                  className="w-full px-4 py-3 bg-gray-800 border border-gray-600 rounded-lg text-white placeholder-gray-500 focus:outline-none focus:border-blue-500 transition-colors"
                />
              </div>

              <div className="flex items-center justify-between text-sm">
                <label className="flex items-center text-gray-300 cursor-pointer">
                  <input type="checkbox" className="mr-2 rounded" />
                  记住我
                </label>
                <a href="#" className="text-blue-400 hover:text-blue-300">
                  忘记密码?
                </a>
              </div>

              <button className="w-full py-3 bg-gradient-to-r from-blue-600 to-blue-700 text-white rounded-lg font-medium hover:from-blue-700 hover:to-blue-800 transition-all duration-200">
                登录
              </button>

              <div className="text-center text-sm text-gray-400">
                还没有账号？{' '}
                <a href="#" className="text-blue-400 hover:text-blue-300">
                  立即注册
                </a>
              </div>
            </div>
          </div>
        </div>
      )}
    </>
  );
}