import React, { useState, useEffect, useCallback, useRef, useMemo } from 'react';
import { useSearchParams } from 'react-router-dom';
import { PageId } from '../components/Sidebar';
import Pagination from '../components/Pagination';
import { Model } from '../types/models';
import { modelApi } from '../services/modelApi';
import { Search, Zap, Flame, Loader2 } from '../icons/commonIcons';
import ModelCard from '../components/ModelCard';
import LocalModelList from '../components/LocalModelList';

interface ModelSquareProps {}

const ModelSquare: React.FC<ModelSquareProps> = () => {
  const [searchParams, setSearchParams] = useSearchParams();
  const modelSource = useMemo(() => searchParams.get('source') || 'cloud', [searchParams]);
  const [activeCategory, setActiveCategory] = useState('全部');
  const activeGroupName = useMemo(() => searchParams.get('group') || '全部', [searchParams]);
  const setActiveGroupName = (name: string) => {
    setSearchParams(prev => {
      const newParams = new URLSearchParams(prev);
      if (name === '全部') {
        newParams.delete('group');
      } else {
        newParams.set('group', name);
      }
      newParams.delete('page');
      return newParams;
    });
  };
  const [groupNames, setGroupNames] = useState<string[]>([]);
  const [models, setModels] = useState<Model[]>([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const [searchKeyword, setSearchKeyword] = useState('');
  
  // 从 URL 读取页码，如果没有则默认为 1
  const currentPage = useMemo(() => {
    const pageParam = searchParams.get('page');
    const page = pageParam ? parseInt(pageParam, 10) : 1;
    return isNaN(page) || page < 1 ? 1 : page;
  }, [searchParams]);
  
  const [pagination, setPagination] = useState({
    page: currentPage,
    pageSize: 21,
    total: 0,
    totalPages: 0
  });
  const [showFilterPanel, setShowFilterPanel] = useState(false);
  const [selectedCompanies, setSelectedCompanies] = useState<string[]>([]);
  const [selectedModalTypes, setSelectedModalTypes] = useState<string[]>([]);
  const [isNewFilter, setIsNewFilter] = useState<boolean | undefined>(undefined);
  const [isFeaturedFilter, setIsFeaturedFilter] = useState<boolean | undefined>(undefined);
  const [isApiEnabledFilter, setIsApiEnabledFilter] = useState<boolean | undefined>(undefined);
  const [sortBy, setSortBy] = useState<string>('createdAt');
  const [sortOrder, setSortOrder] = useState<'asc' | 'desc'>('desc');
  const filterPanelRef = useRef<HTMLDivElement>(null);
  const filterButtonRef = useRef<HTMLButtonElement>(null);
  // 简单内存缓存，用于切换时快速展示已加载的数据（key 为 source|category|keyword）
  const modelsCacheRef = useRef<Record<string, Model[]>>({});
  const fetchTimerRef = useRef<number | null>(null);

  // 供应商列表（通义合并为一个，不做细分）
  const allSuppliers = ['通义', 'DeepSeek', 'Moonshot', '智谱AI', 'Black Forest Labs', 'MiniMax', 'Stability AI'];

  // 标签分组定义（与数据库实际标签值对应）
  const modalTypeGroups = {
    '版本': ['最新版本'],
    '翻译': ['翻译'],
    '视觉': ['视频生成']
  };
  
  // 模型分类列表（与后端 ModelCategory 枚举一致）
  const modelCategories = ['全部', '语言模型', '多模态模型', 'TTS模型', 'STT模型', '生图模型', '生视频模型', '图像编辑', 'Embedding', 'Rerank'];
  
  // 不再需要加载百炼模型数据，直接使用API

  const getCategoryTagStyle = (category: string) => {
    switch (category) {
      case '语言模型': return 'bg-blue-50 text-blue-600 border-blue-200';
      case '多模态模型': return 'bg-indigo-50 text-indigo-600 border-indigo-200';
      case 'TTS模型': return 'bg-emerald-50 text-emerald-600 border-emerald-200';
      case 'STT模型': return 'bg-teal-50 text-teal-600 border-teal-200';
      case '生图模型': return 'bg-purple-50 text-purple-600 border-purple-200';
      case '生视频模型': return 'bg-orange-50 text-orange-600 border-orange-200';
      case '图像编辑': return 'bg-pink-50 text-pink-600 border-pink-200';
      case 'Embedding': return 'bg-cyan-50 text-cyan-600 border-cyan-200';
      case 'Rerank': return 'bg-amber-50 text-amber-600 border-amber-200';
      default: return 'bg-gray-50 text-gray-500 border-gray-100/50';
    }
  };

  // 获取模型列表（从API获取）
  const fetchModels = useCallback(async () => {
    try {
      setError(null);

      // 防抖：清理已有定时器，延迟实际请求以合并快速的切换/输入
      if (fetchTimerRef.current) {
        window.clearTimeout(fetchTimerRef.current);
      }

      // 计算缓存键
      const categoryParam = modelSource === 'local'
        ? (activeCategory !== '全部' ? activeCategory : '多模态模型')
        : (activeCategory !== '全部' ? activeCategory : undefined);
      const groupNameParam = modelSource === 'cloud' && activeGroupName !== '全部' ? activeGroupName : undefined;
      const cacheKey = `${modelSource}|${categoryParam || 'all'}|${groupNameParam || 'all'}|${searchKeyword || ''}`;

      // 如果有缓存，先使用缓存快速展示（不覆盖后续刷新结果）
      const cached = modelsCacheRef.current[cacheKey];
      if (cached && cached.length > 0) {
        setModels(cached);
        setPagination(prev => ({ ...prev, total: cached.length, totalPages: 1, page: 1 }));
        setLoading(false);
      } else {
        // 如果没有缓存且是本地且期望显示开源模型，立即展示占位（快速反馈）
        if (modelSource === 'local') {
          setModels([]);
          setLoading(true);
        } else {
          setLoading(true);
        }
      }

      // 延迟实际网络请求，合并短时间内的多次变更
      fetchTimerRef.current = window.setTimeout(async () => {
        // 处理供应商筛选：将显示名称映射到实际的供应商名称
        let supplierFilter: string | undefined;
        if (selectedCompanies.length > 0) {
          const supplierMap: Record<string, string> = {
            '通义': 'Qwen',
            'DeepSeek': 'DeepSeek',
            'Moonshot': 'Moonshot',
            '智谱AI': '智谱AI',
            'Black Forest Labs': 'Black Forest Labs',
            'MiniMax': 'MiniMax',
            'Stability AI': 'Stability AI'
          };
          supplierFilter = supplierMap[selectedCompanies[0]] || selectedCompanies[0];
        }

        // 处理标签筛选：后端 filter_tag 参数支持在 tag1 或 tag2 中精确匹配
        let tagFilter: string | undefined;
        if (selectedModalTypes.length > 0) {
          tagFilter = selectedModalTypes[0];
        }

        const response = await modelApi.getModels({
          keyword: modelSource === 'local' ? '通义千问3开源模型' : (searchKeyword || undefined),
          page: currentPage,
          pageSize: 21,
          category: categoryParam,
          supplier: modelSource === 'local' ? undefined : supplierFilter,
          group_name: groupNameParam,
          filter_tag: modelSource === 'local' ? undefined : tagFilter,
          is_api_enabled: modelSource === 'local' ? undefined : isApiEnabledFilter,
          isNew: modelSource === 'local' ? undefined : isNewFilter,
          isHot: modelSource === 'local' ? undefined : isFeaturedFilter,
          sortBy,
          order: sortOrder
        }, false);

        if (response.code === 200 && response.data) {
          let list = response.data.list;
          let pagination = response.data.pagination;

          // 如果是本地模型且列表为空，但当前分类是多模态，则注入mock
          if (modelSource === 'local' && list.length === 0 && (activeCategory === '多模态模型' || activeCategory === '全部' && categoryParam === '多模态模型')) {
            const mockModel: Model = {
              id: -1,
              title: 'qwen3-vl-32b-thinking',
              name: '通义千问3开源模型',
              img: '/icons/Tongyi.svg',
              description: '通义千问3系列开源模型，支持多模态输入，具备强大的视觉理解与逻辑推理能力。',
              tag1: '开源',
              tag2: '32B',
              category: 1,
              supplier: 'Qwen',
              is_featured: true,
              created_at: new Date().toISOString(),
              updated_at: new Date().toISOString(),
              pricing_mode: 'free',
              input_price: '0',
              output_price: '0',
              price_unit: '1k tokens',
              price_currency: 'CNY',
              price_tiers: [],
              keyword: '开源,多模态,Qwen3'
            };
            list = [mockModel];
            pagination = {
              page: 1,
              pageSize: 21,
              total: 1,
              totalPages: 1
            };
          }

          // 云端模型：按正常顺序显示，不硬编码任何模型

          // 更新缓存并设置展示
          modelsCacheRef.current[cacheKey] = list;
          setModels(list);
          setPagination(pagination);
          setLoading(false);
        } else {
          throw new Error(response.message || '获取模型列表失败');
        }
      }, 150); // 150ms 防抖

      return;
    } catch (err) {
      setError(err instanceof Error ? err.message : '网络错误，请稍后重试');
      console.error('Failed to fetch models:', err);
    } finally {
      // 仅在没有缓存展示时才关闭 loading（缓存路径上已经设置过）
      if (!models || models.length === 0) setLoading(false);
    }
  }, [activeCategory, activeGroupName, searchKeyword, selectedCompanies, selectedModalTypes, isNewFilter, isFeaturedFilter, isApiEnabledFilter, sortBy, sortOrder, currentPage, modelSource]);

  // 获取分组列表
  const fetchGroupNames = useCallback(async () => {
    if (modelSource !== 'cloud') return;
    try {
      const response = await modelApi.getGroupNames();
      if (response.code === 200 && response.data) {
        setGroupNames(response.data);
      }
    } catch (err) {
      console.error('Failed to fetch group names:', err);
    }
  }, [modelSource]);

  // 初始加载分组列表
  useEffect(() => {
    fetchGroupNames();
  }, [fetchGroupNames]);

  // 初始加载和URL页码变化时，重新获取数据并立即跳转到顶部
  useEffect(() => {
    fetchModels();
    // 立即跳转到顶部
    const mainElement = document.querySelector('main');
    if (mainElement) {
      mainElement.scrollTop = 0;
    }
  }, [currentPage, fetchModels]);

  // 初始加载和分类切换时，重置页码为 1
  useEffect(() => {
    setSearchParams(prev => {
      const newParams = new URLSearchParams(prev);
      newParams.delete('page');
      newParams.set('source', modelSource);
      return newParams;
    });
  }, [activeCategory, activeGroupName, modelSource]); // eslint-disable-line react-hooks/exhaustive-deps

  // 筛选条件改变时自动应用筛选并重置页码为 1
  useEffect(() => {
    // 使用一个标志来避免初始加载时触发
    const timer = setTimeout(() => {
      if (pagination.total > 0 || models.length > 0) {
        setSearchParams(prev => {
          const newParams = new URLSearchParams(prev);
          newParams.delete('page');
          newParams.set('source', modelSource);
          return newParams;
        });
      }
    }, 100);
    return () => clearTimeout(timer);
  }, [selectedCompanies, selectedModalTypes, isNewFilter, isFeaturedFilter, isApiEnabledFilter, sortBy, sortOrder, modelSource]); // eslint-disable-line react-hooks/exhaustive-deps

  // 点击外部关闭筛选面板
  useEffect(() => {
    const handleClickOutside = (event: MouseEvent) => {
      if (
        filterPanelRef.current &&
        !filterPanelRef.current.contains(event.target as Node) &&
        filterButtonRef.current &&
        !filterButtonRef.current.contains(event.target as Node)
      ) {
        setShowFilterPanel(false);
      }
    };

    if (showFilterPanel) {
      document.addEventListener('mousedown', handleClickOutside);
    }

    return () => {
      document.removeEventListener('mousedown', handleClickOutside);
    };
  }, [showFilterPanel]);

  // 切换厂商选择
  const toggleCompany = (company: string) => {
    setSelectedCompanies(prev =>
      prev.includes(company)
        ? prev.filter(c => c !== company)
        : [...prev, company]
    );
  };

  // 切换模态类型选择
  const toggleModalType = (modalType: string) => {
    setSelectedModalTypes(prev =>
      prev.includes(modalType)
        ? prev.filter(m => m !== modalType)
        : [...prev, modalType]
    );
  };

  // 清除所有筛选条件
  const clearFilters = () => {
    setSelectedCompanies([]);
    setSelectedModalTypes([]);
    setIsNewFilter(undefined);
    setIsFeaturedFilter(undefined);
    setIsApiEnabledFilter(undefined);
    setSortBy('createdAt');
    setSortOrder('desc');
  };

  // 计算选中数量
  const selectedCount = selectedCompanies.length + selectedModalTypes.length + 
    (isNewFilter !== undefined ? 1 : 0) + (isFeaturedFilter !== undefined ? 1 : 0) + (isApiEnabledFilter !== undefined ? 1 : 0);

  // 检查是否有活动的筛选条件
  const hasActiveFilters = selectedCompanies.length > 0 || selectedModalTypes.length > 0 || 
    isNewFilter !== undefined || isFeaturedFilter !== undefined || isApiEnabledFilter !== undefined || sortBy !== 'createdAt' || sortOrder !== 'desc';

  // 搜索处理
  const handleSearch = (e: React.FormEvent) => {
    e.preventDefault();
    setSearchParams(prev => {
      const newParams = new URLSearchParams(prev);
      newParams.delete('page');
      newParams.set('source', modelSource);
      return newParams;
    });
  };

  return (
    <div className="bg-white p-4 sm:p-6 md:p-8 rounded-2xl border border-gray-100 shadow-sm">
      <div className="space-y-4 sm:space-y-6 md:space-y-8 animate-in fade-in duration-500">
        <div className="flex flex-col md:flex-row md:items-center justify-between gap-3 sm:gap-4 md:gap-6">
          <div className="flex-1">
            <h2 className="text-xl sm:text-2xl font-bold text-gray-900 tracking-tight">模型广场</h2>
            <p className="text-sm text-gray-500 mt-1">
              {modelSource === 'local' ? '运行于本地节点的私域模型，确保数据隐私与高效响应' : '探索前沿 AI 基础模型，一键集成到您的创作流'}
            </p>
          </div>

        {/* 云端/本地模型切换Tab - 居中 */}
        <div className="flex items-center justify-center">
          <div className="flex items-center bg-gray-100 rounded-xl p-1">
            <button
              onClick={() => {
                if (modelSource !== 'cloud') {
                  setActiveCategory('全部');
                  clearFilters();
                  setSearchParams(prev => {
                    const newParams = new URLSearchParams(prev);
                    newParams.set('source', 'cloud');
                    newParams.delete('page');
                    return newParams;
                  });
                }
              }}
              className={`px-5 py-2 rounded-lg text-sm font-medium transition-all duration-200 ${
                modelSource === 'cloud'
                  ? 'bg-white text-blue-600 shadow-sm'
                  : 'text-gray-500 hover:text-gray-700'
              }`}
            >
              云端模型
            </button>
            <button
              onClick={() => {
                if (modelSource !== 'local') {
                  setActiveCategory('全部');
                  clearFilters();
                  setSearchParams(prev => {
                    const newParams = new URLSearchParams(prev);
                    newParams.set('source', 'local');
                    newParams.delete('page');
                    return newParams;
                  });
                }
              }}
              className={`px-5 py-2 rounded-lg text-sm font-medium transition-all duration-200 ${
                modelSource === 'local'
                  ? 'bg-white text-blue-600 shadow-sm'
                  : 'text-gray-500 hover:text-gray-700'
              }`}
            >
              私域模型
            </button>
          </div>
        </div>

        {/* 右侧占位，保持Tab居中 */}
        <div className="flex-1"></div>
      </div>

      {/* 分类选择器 + 搜索筛选 - 仅云端模型显示 */}
      {modelSource === 'cloud' && (
        <div className="flex flex-col gap-3 pb-2">
          {/* 分组筛选按钮行 - 在分类按钮上方 */}
          {groupNames.length > 0 && (
            <div className="flex items-center space-x-2 overflow-x-auto scrollbar-hide">
              <button
                onClick={() => setActiveGroupName('全部')}
                className={`px-4 py-1.5 rounded-full text-xs font-medium whitespace-nowrap transition-all duration-200 ${
                  activeGroupName === '全部'
                    ? 'bg-violet-600 text-white shadow-md shadow-violet-600/20'
                    : 'bg-white text-gray-500 border border-gray-100 hover:border-violet-200 hover:text-violet-600'
                }`}
              >
                全部分组
              </button>
              {groupNames.map(name => (
                <button
                  key={name}
                  onClick={() => setActiveGroupName(name)}
                  className={`px-4 py-1.5 rounded-full text-xs font-medium whitespace-nowrap transition-all duration-200 ${
                    activeGroupName === name
                      ? 'bg-violet-600 text-white shadow-md shadow-violet-600/20'
                      : 'bg-white text-gray-500 border border-gray-100 hover:border-violet-200 hover:text-violet-600'
                  }`}
                >
                  {name}
                </button>
              ))}
            </div>
          )}

          {/* 模型分类按钮 + 搜索框 */}
          <div className="flex flex-col sm:flex-row items-start sm:items-center justify-between gap-3 sm:gap-4">
            <div className="flex items-center space-x-2 overflow-x-auto scrollbar-hide w-full sm:w-auto pb-1 sm:pb-0">
              {modelCategories.map(cat => (
                <button 
                  key={cat} 
                  onClick={() => setActiveCategory(cat)}
                  className={`px-6 py-2 rounded-full text-xs font-bold whitespace-nowrap transition-all duration-200 ${
                    cat === activeCategory 
                      ? 'bg-blue-600 text-white shadow-lg shadow-blue-600/20' 
                      : 'bg-white text-gray-500 border border-gray-100 hover:border-blue-200 hover:text-blue-600'
                  }`}
                >
                  {cat}
                </button>
              ))}
            </div>
            
            {/* 搜索框 */}
            <div className="flex items-center gap-2 flex-shrink-0 w-full sm:w-auto">
              <form onSubmit={handleSearch} className="relative group w-full sm:w-auto">
                <Search className="absolute left-3 top-1/2 -translate-y-1/2 text-gray-400 w-4 h-4 group-focus-within:text-blue-500 transition-colors" />
                <input 
                  type="text" 
                  value={searchKeyword}
                  onChange={(e) => setSearchKeyword(e.target.value)}
                  placeholder="搜索模型名称" 
                  className="pl-10 pr-4 py-2 bg-white border border-gray-200 rounded-xl text-sm outline-none focus:ring-2 focus:ring-blue-500/20 focus:border-blue-500 w-full sm:w-48 transition-all shadow-sm" 
                />
              </form>
            </div>
          </div>
        </div>
      )}

      {/* 主体区域：模型列表（移除右侧分组面板，分组已移至顶部） */}
      <div className="flex gap-4">
        {/* 模型内容区 */}
        <div className="flex-1 min-w-0 space-y-4">
          {/* 本地模型列表 */}
          {modelSource === 'local' && (
            <LocalModelList />
          )}

          {/* 云端模型加载状态 */}
          {modelSource === 'cloud' && loading && (
            <div className="flex items-center justify-center py-20">
              <Loader2 className="w-8 h-8 text-blue-600 animate-spin" />
              <span className="ml-3 text-gray-600">加载中...</span>
            </div>
          )}

          {/* 云端模型错误状态 */}
          {modelSource === 'cloud' && error && !loading && (
            <div className="bg-red-50 border border-red-200 rounded-xl p-4 text-center">
              <p className="text-red-600">{error}</p>
              <button
                onClick={() => fetchModels()}
                className="mt-2 text-sm text-red-600 font-bold hover:underline"
              >
                重试
              </button>
            </div>
          )}

          {/* 云端模型列表或空状态 */}
          {modelSource === 'cloud' && !loading && !error && (
            <>
              {models.length > 0 ? (
                <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-3 sm:gap-4">
                  {models.map((m) => (
                    <ModelCard
                      key={m.id}
                      model={m}
                      versionDisplayMode="standard"
                    />
                  ))}
                </div>
              ) : (
                <div className="py-20 flex flex-col items-center justify-center text-center bg-gray-50 rounded-3xl border-2 border-dashed border-gray-200">
                  <div className="w-16 h-16 bg-white rounded-full flex items-center justify-center shadow-sm mb-4">
                    <Search className="w-8 h-8 text-gray-300" />
                  </div>
                  <h3 className="text-lg font-bold text-gray-900">未找到相关模型</h3>
                  <p className="text-sm text-gray-500 mt-2">试试更换分类或搜索关键词</p>
                  <button 
                    onClick={() => {
                      setActiveCategory('全部');
                      setSearchKeyword('');
                    }}
                    className="mt-6 text-sm text-blue-600 font-bold hover:underline"
                  >
                    查看全部模型
                  </button>
                </div>
              )}
            </>
          )}

          {/* 云端模型分页信息 */}
          {modelSource === 'cloud' && !loading && !error && (
            <Pagination
              total={pagination.total}
              totalPages={pagination.totalPages}
              currentPage={currentPage}
            />
          )}
        </div>

        {/* 右侧分组面板已移至顶部，此处不再显示 */}
      </div>
      </div>
    </div>
  );
};

export default ModelSquare;