'use client';

import React, { useState, useEffect } from 'react';
import { cn } from '@/public/lib/utils';

interface Project {
  id: string;
  name: string;
  status: 'active' | 'inactive';
  last_activity: string;
}

interface ProjectSelectorProps {
  selectedProjectIds: string[];
  onProjectChange: (projectIds: string[]) => void;
}

export default function ProjectSelector({ selectedProjectIds, onProjectChange }: ProjectSelectorProps) {
  const [isOpen, setIsOpen] = useState(false);
  const [searchTerm, setSearchTerm] = useState('');
  const [projects, setProjects] = useState<Project[]>([]);
  const [loading, setLoading] = useState(false);

  // 模拟项目数据 - 在实际应用中应该从API获取
  const mockProjects: Project[] = [
    {
      id: 'bc43bc81-c781-4caa-8256-9710fd5bee80',
      name: '视频制作项目 A',
      status: 'active',
      last_activity: '2024-01-15T10:30:00Z'
    },
    {
      id: 'd203016d-6f7e-4d1c-b66b-1b7d33632800',
      name: '视频制作项目 B',
      status: 'active',
      last_activity: '2024-01-15T09:15:00Z'
    },
    {
      id: '029bbc09-6d83-440b-97fe-e2aa37b8042d',
      name: '视频制作项目 C',
      status: 'active',
      last_activity: '2024-01-14T16:45:00Z'
    },
    {
      id: 'f47ac10b-58cc-4372-a567-0e02b2c3d479',
      name: '视频制作项目 D',
      status: 'inactive',
      last_activity: '2024-01-10T14:20:00Z'
    },
  ];

  useEffect(() => {
    // 模拟加载项目列表
    setLoading(true);
    setTimeout(() => {
      setProjects(mockProjects);
      setLoading(false);
    }, 500);
  }, []);

  const filteredProjects = projects.filter(project =>
    project.name.toLowerCase().includes(searchTerm.toLowerCase()) ||
    project.id.toLowerCase().includes(searchTerm.toLowerCase())
  );

  const handleProjectToggle = (projectId: string) => {
    if (selectedProjectIds.includes(projectId)) {
      // 移除项目
      onProjectChange(selectedProjectIds.filter(id => id !== projectId));
    } else {
      // 添加项目
      onProjectChange([...selectedProjectIds, projectId]);
    }
  };

  const handleSelectAll = () => {
    const activeProjects = filteredProjects.filter(p => p.status === 'active');
    onProjectChange(activeProjects.map(p => p.id));
  };

  const handleClearAll = () => {
    onProjectChange([]);
  };

  const getSelectedProjectNames = () => {
    return selectedProjectIds
      .map(id => projects.find(p => p.id === id)?.name || id.slice(0, 8))
      .join(', ');
  };

  return (
    <div className="relative">
      {/* 选择器按钮 */}
      <button
        onClick={() => setIsOpen(!isOpen)}
        className="flex items-center gap-2 px-4 py-2 bg-gray-800 border border-gray-700 rounded-lg text-white hover:bg-gray-700 transition-colors min-w-[200px]"
      >
        <div className="flex-1 text-left truncate">
          {selectedProjectIds.length === 0 ? (
            <span className="text-gray-400">选择项目...</span>
          ) : selectedProjectIds.length === 1 ? (
            <span>{getSelectedProjectNames()}</span>
          ) : (
            <span>{selectedProjectIds.length} 个项目</span>
          )}
        </div>
        <svg
          className={cn('w-4 h-4 transition-transform', isOpen && 'rotate-180')}
          fill="none"
          stroke="currentColor"
          viewBox="0 0 24 24"
        >
          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 9l-7 7-7-7" />
        </svg>
      </button>

      {/* 下拉面板 */}
      {isOpen && (
        <div className="absolute top-full left-0 mt-2 w-80 bg-gray-800 border border-gray-700 rounded-lg shadow-xl z-50">
          {/* 搜索框 */}
          <div className="p-3 border-b border-gray-700">
            <input
              type="text"
              placeholder="搜索项目..."
              value={searchTerm}
              onChange={(e) => setSearchTerm(e.target.value)}
              className="w-full px-3 py-2 bg-gray-700 border border-gray-600 rounded text-white placeholder-gray-400 text-sm focus:outline-none focus:border-blue-500"
            />
          </div>

          {/* 批量操作 */}
          <div className="p-3 border-b border-gray-700 flex gap-2">
            <button
              onClick={handleSelectAll}
              className="px-3 py-1 bg-blue-500 hover:bg-blue-600 text-white rounded text-sm transition-colors"
            >
              全选活跃
            </button>
            <button
              onClick={handleClearAll}
              className="px-3 py-1 bg-gray-600 hover:bg-gray-500 text-white rounded text-sm transition-colors"
            >
              清空
            </button>
            <div className="flex-1 text-right text-sm text-gray-400 flex items-center justify-end">
              已选 {selectedProjectIds.length} 个
            </div>
          </div>

          {/* 项目列表 */}
          <div className="max-h-64 overflow-y-auto">
            {loading ? (
              <div className="p-4 text-center text-gray-400">
                <div className="animate-spin w-6 h-6 border-2 border-blue-500 border-t-transparent rounded-full mx-auto mb-2"></div>
                加载中...
              </div>
            ) : filteredProjects.length === 0 ? (
              <div className="p-4 text-center text-gray-400">
                {searchTerm ? '未找到匹配的项目' : '暂无项目'}
              </div>
            ) : (
              <div className="p-2">
                {filteredProjects.map((project) => (
                  <div
                    key={project.id}
                    className={cn(
                      'flex items-center gap-3 p-2 rounded hover:bg-gray-700 cursor-pointer transition-colors',
                      selectedProjectIds.includes(project.id) && 'bg-blue-500/20'
                    )}
                    onClick={() => handleProjectToggle(project.id)}
                  >
                    <input
                      type="checkbox"
                      checked={selectedProjectIds.includes(project.id)}
                      onChange={() => {}} // 由父级点击处理
                      className="rounded"
                    />
                    
                    <div className="flex-1 min-w-0">
                      <div className="flex items-center gap-2">
                        <span className="text-white font-medium truncate">{project.name}</span>
                        <div className={cn(
                          'w-2 h-2 rounded-full',
                          project.status === 'active' ? 'bg-emerald-400' : 'bg-gray-500'
                        )}></div>
                      </div>
                      <div className="text-xs text-gray-400 truncate">
                        ID: {project.id}
                      </div>
                      <div className="text-xs text-gray-500">
                        最后活动: {new Date(project.last_activity).toLocaleDateString()}
                      </div>
                    </div>
                  </div>
                ))}
              </div>
            )}
          </div>

          {/* 底部信息 */}
          <div className="p-3 border-t border-gray-700 text-xs text-gray-400">
            <div className="flex items-center justify-between">
              <span>共 {projects.length} 个项目</span>
              <span>支持多选对比</span>
            </div>
          </div>
        </div>
      )}

      {/* 点击外部关闭 */}
      {isOpen && (
        <div
          className="fixed inset-0 z-40"
          onClick={() => setIsOpen(false)}
        />
      )}
    </div>
  );
}