import React, { useCallback, useState } from 'react';
import {
  Grid,
  List,
  Loader2,
  AlertCircle,
  Package,
} from 'lucide-react';
import { MaterialSearchResultsProps } from '../../types/outfitRecommendation';
import { MaterialCard, MaterialSearchPagination } from './index';
import { EmptyState } from '../EmptyState';
import MaterialSearchService from '../../services/materialSearchService';

/**
 * 素材检索结果列表组件
 * 遵循设计系统规范，提供统一的结果展示界面
 */
const MaterialSearchResults: React.FC<MaterialSearchResultsProps> = ({
  results,
  totalSize,
  currentPage,
  pageSize,
  isLoading = false,
  error,
  onPageChange,
  onMaterialSelect,
  className = '',
}) => {
  // 视图模式状态
  const [viewMode, setViewMode] = useState<'grid' | 'list'>('grid');

  // 计算分页信息
  const totalPages = MaterialSearchService.getTotalPages(totalSize, pageSize);
  const pageInfo = MaterialSearchService.getPageRangeInfo(currentPage, pageSize, totalSize);

  // 处理页面变化
  const handlePageChange = useCallback((page: number) => {
    if (page >= 1 && page <= totalPages && !isLoading) {
      onPageChange(page);
    }
  }, [totalPages, onPageChange, isLoading]);

  // 处理素材选择
  const handleMaterialSelect = useCallback((material: any) => {
    if (onMaterialSelect) {
      onMaterialSelect(material);
    }
  }, [onMaterialSelect]);

  // 加载状态
  if (isLoading && results.length === 0) {
    return (
      <div className={`space-y-6 ${className}`}>
        {/* 加载标题 */}
        <div className="flex items-center justify-center gap-3 p-6">
          <Loader2 className="w-6 h-6 text-primary-500 animate-spin" />
          <div className="text-center">
            <h3 className="text-lg font-semibold text-high-emphasis mb-1">
              正在检索素材...
            </h3>
            <p className="text-sm text-medium-emphasis">
              请稍候，我们正在为您搜索最合适的素材
            </p>
          </div>
        </div>

        {/* 加载骨架屏 */}
        <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
          {[1, 2, 3, 4, 5, 6].map((index) => (
            <div
              key={index}
              className="card p-4 animate-pulse"
            >
              <div className="space-y-4">
                {/* 图片骨架 */}
                <div className="aspect-square bg-gray-200 rounded-lg"></div>
                
                {/* 标题骨架 */}
                <div className="h-4 bg-gray-200 rounded w-3/4"></div>
                
                {/* 描述骨架 */}
                <div className="space-y-2">
                  <div className="h-3 bg-gray-200 rounded w-full"></div>
                  <div className="h-3 bg-gray-200 rounded w-2/3"></div>
                </div>

                {/* 标签骨架 */}
                <div className="flex gap-2">
                  <div className="h-6 bg-gray-200 rounded-full w-16"></div>
                  <div className="h-6 bg-gray-200 rounded-full w-12"></div>
                </div>
              </div>
            </div>
          ))}
        </div>
      </div>
    );
  }

  // 错误状态
  if (error) {
    return (
      <div className={`${className}`}>
        <EmptyState
          variant="error"
          icon={<AlertCircle className="w-12 h-12 text-red-500" />}
          title="检索失败"
          description={error}
          actionText="重新检索"
          onAction={() => onPageChange(currentPage)}
          illustration="error"
          size="md"
          className="py-12"
        />
      </div>
    );
  }

  // 空状态
  if (!results || results.length === 0) {
    return (
      <div className={`${className}`}>
        <EmptyState
          variant="default"
          icon={<Package className="w-12 h-12 text-gray-400" />}
          title="暂无素材结果"
          description="未找到符合条件的素材，请尝试调整检索条件"
          actionText="重新检索"
          onAction={() => onPageChange(1)}
          illustration="folder"
          size="md"
          className="py-12"
          showTips={true}
          tips={[
            '尝试使用更通用的关键词',
            '调整颜色和风格过滤条件',
            '检查网络连接是否正常',
          ]}
        />
      </div>
    );
  }

  // 正常状态 - 显示结果列表
  return (
    <div className={`space-y-6 max-h-full overflow-y-auto ${className}`}>
      {/* 列表标题和统计信息 */}
      <div className="flex items-center justify-between">
        <div className="flex items-center gap-3">
          <div className="icon-container primary w-8 h-8">
            <Grid className="w-4 h-4" />
          </div>
          <div>
            <h3 className="text-lg font-semibold text-high-emphasis">
              素材检索结果
            </h3>
            <p className="text-sm text-medium-emphasis">
              第 {pageInfo.start}-{pageInfo.end} 项，共 {totalSize} 个素材
            </p>
          </div>
        </div>

        {/* 视图切换 */}
        <div className="flex items-center gap-2">
          <button
            onClick={() => setViewMode('grid')}
            className={`p-2 rounded-lg transition-colors duration-200 ${
              viewMode === 'grid'
                ? 'text-primary-600 bg-primary-50'
                : 'text-gray-400 hover:text-gray-600 hover:bg-gray-100'
            }`}
            title="网格视图"
          >
            <Grid className="w-4 h-4" />
          </button>
          <button
            onClick={() => setViewMode('list')}
            className={`p-2 rounded-lg transition-colors duration-200 ${
              viewMode === 'list'
                ? 'text-primary-600 bg-primary-50'
                : 'text-gray-400 hover:text-gray-600 hover:bg-gray-100'
            }`}
            title="列表视图"
          >
            <List className="w-4 h-4" />
          </button>
        </div>
      </div>

      {/* 素材卡片展示 */}
      <div className={
        viewMode === 'grid'
          ? "grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6"
          : "space-y-4"
      }>
        {results.map((material, index) => (
          <MaterialCard
            key={material.id || index}
            material={material}
            onSelect={handleMaterialSelect}
            showScore={true}
            compact={viewMode === 'list'}
            className={`animate-fade-in-up ${isLoading ? 'opacity-50 pointer-events-none' : ''} ${
              viewMode === 'list' ? 'flex flex-row items-center gap-4 p-4' : ''
            }`}
          />
        ))}
      </div>

      {/* 分页控制 */}
      {totalPages > 1 && (
        <MaterialSearchPagination
          currentPage={currentPage}
          totalPages={totalPages}
          pageSize={pageSize}
          totalSize={totalSize}
          isLoading={isLoading}
          onPageChange={handlePageChange}
          className="mt-8"
        />
      )}

      {/* 底部提示 */}
      <div className="card p-4 bg-gradient-to-r from-blue-50 to-indigo-50 border border-blue-200">
        <div className="flex items-start gap-3">
          <div className="icon-container blue w-6 h-6 mt-0.5 shadow-sm">
            <Package className="w-3 h-3" />
          </div>
          <div className="flex-1">
            <h4 className="text-sm font-semibold text-blue-900 mb-2">💡 使用提示</h4>
            <ul className="text-xs text-blue-700 space-y-1.5">
              <li className="flex items-center gap-2">
                <div className="w-1 h-1 bg-blue-400 rounded-full"></div>
                点击素材卡片查看详细信息和产品描述
              </li>
              <li className="flex items-center gap-2">
                <div className="w-1 h-1 bg-blue-400 rounded-full"></div>
                使用分页控制浏览更多素材结果
              </li>
              <li className="flex items-center gap-2">
                <div className="w-1 h-1 bg-blue-400 rounded-full"></div>
                相关性评分越高表示与穿搭方案越匹配
              </li>
              <li className="flex items-center gap-2">
                <div className="w-1 h-1 bg-blue-400 rounded-full"></div>
                可以重新生成检索条件获得不同的结果
              </li>
            </ul>
          </div>
        </div>
      </div>

      {/* 加载遮罩 */}
      {isLoading && results.length > 0 && (
        <div className="absolute inset-0 bg-white/50 backdrop-blur-sm flex items-center justify-center">
          <div className="flex items-center gap-3 bg-white rounded-lg shadow-lg p-4">
            <Loader2 className="w-5 h-5 text-primary-500 animate-spin" />
            <span className="text-sm font-medium text-gray-700">正在加载...</span>
          </div>
        </div>
      )}
    </div>
  );
};

export default MaterialSearchResults;
