import type { MetaFunction, LoaderFunctionArgs } from '@remix-run/node';
import { useLoaderData, useSearchParams, useNavigate } from '@remix-run/react';
import { useState } from 'react';
import { SearchResultHeader } from '~/components/contract-template/SearchResultHeader';
import { FilterTabs } from '~/components/contract-template/FilterTabs';
import { TemplateGrid } from '~/components/contract-template/TemplateGrid';
import { Pagination } from '~/components/ui/Pagination';
import styles from '~/styles/pages/contract-template.css?url';

export const links = () => [
  { rel: 'stylesheet', href: styles }
];

export const meta: MetaFunction = () => {
  return [
    { title: '合同模板列表 - 智慧法务' },
    { 
      name: 'description', 
      content: '浏览和管理所有合同模板，按分类查看各种类型的合同模板。' 
    }
  ];
};

// 模拟数据 - 完整的模板库
const mockTemplates = [
  {
    id: '1',
    title: '烟草产品销售合同（2023版）',
    type: '标准版',
    description: '最新版本的烟草产品销售合同模板，包含完整的法律条款、风险控制措施和行业标准要求。',
    updateTime: '2023-10-25',
    useCount: 2156,
    rating: 4.9,
    category: '销售合同'
  },
  {
    id: '2',
    title: '零售商销售协议模板',
    type: '标准版',
    description: '专为零售商设计的销售协议，涵盖商品配送、结算方式、退换货政策等关键条款。',
    updateTime: '2023-10-20',
    useCount: 1834,
    rating: 4.8,
    category: '销售合同'
  },
  {
    id: '3',
    title: '大客户销售合同模板',
    type: '专业版',
    description: '适用于大客户的专业销售合同，包含定制化条款、特殊优惠政策和长期合作框架。',
    updateTime: '2023-10-18',
    useCount: 1245,
    rating: 4.7,
    category: '销售合同'
  },
  {
    id: '4',
    title: '小额销售合同（简化版）',
    type: '简化版',
    description: '适用于小额交易的简化版销售合同，条款精简但保证法律效力。',
    updateTime: '2023-10-15',
    useCount: 956,
    rating: 4.6,
    category: '销售合同'
  },
  {
    id: '5',
    title: '区域代理销售合同',
    type: '标准版',
    description: '区域代理商专用销售合同，明确代理权限、销售目标和考核标准。',
    updateTime: '2023-10-12',
    useCount: 743,
    rating: 4.5,
    category: '销售合同'
  },
  {
    id: '6',
    title: '批发销售合同模板',
    type: '标准版',
    description: '适用于大宗批发业务的销售合同，包含数量折扣、物流配送等专业条款。',
    updateTime: '2023-10-10',
    useCount: 612,
    rating: 4.4,
    category: '销售合同'
  },
  {
    id: '7',
    title: '设备采购合同标准模板',
    type: '标准版',
    description: '设备采购专用合同模板，包含详细的技术要求、验收标准、质保条款等内容。',
    updateTime: '2023-10-08',
    useCount: 589,
    rating: 4.6,
    category: '采购合同'
  },
  {
    id: '8',
    title: '服务类采购合同',
    type: '标准版',
    description: '适用于各类服务采购，包含服务标准、交付要求、考核指标等条款。',
    updateTime: '2023-10-05',
    useCount: 432,
    rating: 4.5,
    category: '采购合同'
  }
];

export async function loader({ request }: LoaderFunctionArgs) {
  const url = new URL(request.url);
  const category = url.searchParams.get('category') || '';
  const type = url.searchParams.get('type') || '';
  const page = parseInt(url.searchParams.get('page') || '1');
  const pageSize = 6;
  
  // 筛选模板
  let filteredTemplates = mockTemplates;
  
  if (category) {
    filteredTemplates = filteredTemplates.filter(t => t.category === category);
  }
  
  if (type) {
    filteredTemplates = filteredTemplates.filter(t => t.type === type);
  }
  
  const total = filteredTemplates.length;
  const startIndex = (page - 1) * pageSize;
  const templates = filteredTemplates.slice(startIndex, startIndex + pageSize);

  return {
    templates,
    total,
    page,
    pageSize,
    category,
    type
  };
}

export default function ContractTemplateList() {
  const { templates, total, page, pageSize, category } = useLoaderData<typeof loader>();
  const [searchParams] = useSearchParams();
  const navigate = useNavigate();
  const [activeFilter, setActiveFilter] = useState(category || '全部');
  const [viewMode, setViewMode] = useState<'grid' | 'list'>('grid');
  const [sortBy, setSortBy] = useState('newest');

  const handleTemplateClick = (templateId: string) => {
    navigate(`/contract-template/detail/${templateId}`);
  };

  const handleFilterChange = (filter: string) => {
    setActiveFilter(filter);
    const params = new URLSearchParams(searchParams);
    
    if (filter === '全部') {
      params.delete('category');
    } else {
      params.set('category', filter);
    }
    params.delete('page'); // 重置页码
    
    navigate(`/contract-template/list?${params.toString()}`);
  };

  const handlePageChange = (newPage: number) => {
    const params = new URLSearchParams(searchParams);
    params.set('page', newPage.toString());
    navigate(`/contract-template/list?${params.toString()}`);
  };

  // 动态生成筛选选项
  const allCategories = [...new Set(mockTemplates.map(t => t.category))];
  const filters = [
    { label: '全部', count: mockTemplates.length },
    ...allCategories.map(cat => ({
      label: cat,
      count: mockTemplates.filter(t => t.category === cat).length
    }))
  ];

  const totalPages = Math.ceil(total / pageSize);
  const currentCategory = category || '全部';

  return (
    <div className="contract-search-results">
      {/* 页面头部 */}
      <div className="result-header">
        <div>
          <h2 className="text-2xl font-semibold mb-2">
            {currentCategory === '全部' ? '合同模板库' : `${currentCategory}模板`}
          </h2>
          <div className="result-info">
            共 <span className="result-count">{total}</span> 个模板
          </div>
        </div>
        <div className="flex items-center gap-4">
          <SearchResultHeader 
            total={0}
            viewMode={viewMode}
            onViewModeChange={setViewMode}
            sortBy={sortBy}
            onSortChange={setSortBy}
          />
        </div>
      </div>

      {/* 筛选标签 */}
      <FilterTabs 
        filters={filters}
        activeFilter={activeFilter}
        onFilterChange={handleFilterChange}
      />

      {/* 模板网格 */}
      <TemplateGrid 
        templates={templates}
        viewMode={viewMode}
        onTemplateClick={handleTemplateClick}
      />

      {/* 分页 */}
      {totalPages > 1 && (
        <Pagination 
          currentPage={page}
          total={total}
          pageSize={pageSize}
          onChange={handlePageChange}
          showPageSizeChanger={false}
        />
      )}
    </div>
  );
}

// 面包屑导航配置
export const handle = {
  breadcrumb: "合同列表"
};