import React from 'react';
import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
import { Button } from '@/client/components/ui/button';
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/client/components/ui/card';
import { Table, TableBody, TableCell, TableHead, TableHeader, TableRow } from '@/client/components/ui/table';
import { DataTablePagination } from '../components/DataTablePagination';
import { Plus, Edit, Trash2, Search, Power, ListTree, Table as TableIcon, RotateCcw } from 'lucide-react';
import { useState, useCallback } from 'react';
import { areaClient } from '@/client/api';
import type { InferResponseType, InferRequestType } from 'hono/client';
import { Input } from '@/client/components/ui/input';
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/client/components/ui/select';
import { Badge } from '@/client/components/ui/badge';
import { Dialog, DialogContent, DialogDescription, DialogHeader, DialogTitle } from '@/client/components/ui/dialog';
import { AlertDialog, AlertDialogAction, AlertDialogCancel, AlertDialogContent, AlertDialogDescription, AlertDialogFooter, AlertDialogHeader, AlertDialogTitle } from '@/client/components/ui/alert-dialog';
import { AreaForm } from '../components/AreaForm';
import { AreaTree } from '../components/AreaTree';
import type { CreateAreaInput, UpdateAreaInput } from '@d8d/server/modules/areas/area.schema';
import { Tabs, TabsContent, TabsList, TabsTrigger } from '@/client/components/ui/tabs';

// 类型提取规范
type AreaResponse = InferResponseType<typeof areaClient.$get, 200>['data'][0];
type SearchAreaRequest = InferRequestType<typeof areaClient.$get>['query'];
type CreateAreaRequest = InferRequestType<typeof areaClient.$post>['json'];
type UpdateAreaRequest = InferRequestType<typeof areaClient[':id']['$put']>['json'];

// 树形节点类型
interface AreaNode {
  id: number;
  name: string;
  code: string;
  level: number;
  parentId: number | null;
  isDisabled: number;
  children?: AreaNode[];
}

// 统一操作处理函数
const handleOperation = async (operation: () => Promise<any>) => {
  try {
    await operation();
    // toast.success('操作成功');
    console.log('操作成功');
  } catch (error) {
    console.error('操作失败:', error);
    // toast.error('操作失败，请重试');
    throw error;
  }
};

// 防抖搜索函数
const debounce = (func: Function, delay: number) => {
  let timeoutId: NodeJS.Timeout;
  return (...args: any[]) => {
    clearTimeout(timeoutId);
    timeoutId = setTimeout(() => func(...args), delay);
  };
};

export const AreasPage: React.FC = () => {
  const queryClient = useQueryClient();
  const [page, setPage] = useState(1);
  const [pageSize, setPageSize] = useState(20);
  const [keyword, setKeyword] = useState('');
  const [level, setLevel] = useState<string>('all');
  const [parentId, setParentId] = useState<string>('');
  const [isDisabled, setIsDisabled] = useState<string>('all');
  const [viewMode, setViewMode] = useState<'table' | 'tree'>('table');
  const [expandedNodes, setExpandedNodes] = useState<Set<number>>(new Set());
  const [isCreateDialogOpen, setIsCreateDialogOpen] = useState(false);
  const [isEditDialogOpen, setIsEditDialogOpen] = useState(false);
  const [isDeleteDialogOpen, setIsDeleteDialogOpen] = useState(false);
  const [isStatusDialogOpen, setIsStatusDialogOpen] = useState(false);
  const [selectedArea, setSelectedArea] = useState<AreaResponse | null>(null);

  // 构建搜索参数
  const filters: Record<string, any> = {};
  if (level && level !== 'all') filters.level = Number(level);
  if (parentId) filters.parentId = Number(parentId);
  if (isDisabled && isDisabled !== 'all') filters.isDisabled = Number(isDisabled);

  const searchParams:SearchAreaRequest = {
    page,
    pageSize,
    keyword: keyword || undefined,
    filters: Object.keys(filters).length > 0 ? JSON.stringify(filters) : undefined,
    sortBy: 'id',
    sortOrder: 'ASC'
  };

  // 查询省市区列表
  const { data, isLoading } = useQuery({
    queryKey: ['areas', searchParams],
    queryFn: async () => {
      const res = await areaClient.$get({
        query: searchParams
      });
      if (res.status !== 200) throw new Error('获取省市区列表失败');
      return await res.json();
    },
    staleTime: 5 * 60 * 1000,
    gcTime: 10 * 60 * 1000,
  });

  // 查询树形结构数据
  const { data: treeData, isLoading: isTreeLoading } = useQuery({
    queryKey: ['areas-tree'],
    queryFn: async () => {
      const res = await areaClient.tree.$get();
      if (res.status !== 200) throw new Error('获取省市区树形数据失败');
      const response = await res.json();
      return response.data;
    },
    staleTime: 5 * 60 * 1000,
    gcTime: 10 * 60 * 1000,
    enabled: viewMode === 'tree'
  });

  // 创建省市区
  const createMutation = useMutation({
    mutationFn: async (data: CreateAreaRequest) => {
      await handleOperation(async () => {
        const res = await areaClient.$post({ json: data });
        if (res.status !== 201) throw new Error('创建省市区失败');
      });
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['areas'] });
      setIsCreateDialogOpen(false);
    },
  });

  // 更新省市区
  const updateMutation = useMutation({
    mutationFn: async ({ id, data }: { id: number; data: UpdateAreaRequest }) => {
      await handleOperation(async () => {
        const res = await areaClient[':id'].$put({
          param: { id },
          json: data
        });
        if (res.status !== 200) throw new Error('更新省市区失败');
      });
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['areas'] });
      setIsEditDialogOpen(false);
      setSelectedArea(null);
    },
  });

  // 删除省市区
  const deleteMutation = useMutation({
    mutationFn: async (id: number) => {
      await handleOperation(async () => {
        const res = await areaClient[':id'].$delete({
          param: { id }
        });
        if (res.status !== 204) throw new Error('删除省市区失败');
      });
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['areas'] });
      setIsDeleteDialogOpen(false);
      setSelectedArea(null);
    },
  });

  // 启用/禁用省市区
  const toggleStatusMutation = useMutation({
    mutationFn: async ({ id, isDisabled }: { id: number; isDisabled: number }) => {
      await handleOperation(async () => {
        const res = await areaClient[':id'].$put({
          param: { id },
          json: { isDisabled }
        });
        if (res.status !== 200) throw new Error('更新省市区状态失败');
      });
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['areas'] });
      setIsStatusDialogOpen(false);
      setSelectedArea(null);
    },
  });

  // 防抖搜索
  const debouncedSearch = useCallback(
    debounce((keyword: string) => {
      setKeyword(keyword);
      setPage(1);
    }, 300),
    []
  );


  // 处理筛选变化
  const handleFilterChange = (filterType: string, value: string) => {
    switch (filterType) {
      case 'level':
        setLevel(value);
        break;
      case 'parentId':
        setParentId(value);
        break;
      case 'isDisabled':
        setIsDisabled(value);
        break;
    }
    setPage(1);
  };

  // 处理创建省市区
  const handleCreateArea = async (data: CreateAreaInput | UpdateAreaInput) => {
    await createMutation.mutateAsync(data as CreateAreaInput);
  };

  // 处理更新省市区
  const handleUpdateArea = async (data: UpdateAreaInput) => {
    if (!selectedArea) return;
    await updateMutation.mutateAsync({ id: selectedArea.id, data });
  };

  // 处理删除省市区
  const handleDeleteArea = async () => {
    if (!selectedArea) return;
    await deleteMutation.mutateAsync(selectedArea.id);
  };

  // 处理启用/禁用省市区
  const handleToggleStatus = async (isDisabled: number) => {
    if (!selectedArea) return;
    await toggleStatusMutation.mutateAsync({ id: selectedArea.id, isDisabled });
  };

  // 打开编辑对话框
  const handleEdit = (area: AreaNode) => {
    // 将 AreaNode 转换为 AreaResponse
    const areaResponse: AreaResponse = {
      ...area,
      isDeleted: 0,
      createdAt: new Date().toISOString(),
      updatedAt: new Date().toISOString(),
      createdBy: null,
      updatedBy: null
    };
    setSelectedArea(areaResponse);
    setIsEditDialogOpen(true);
  };

  // 打开删除对话框
  const handleDelete = (area: AreaNode) => {
    // 将 AreaNode 转换为 AreaResponse
    const areaResponse: AreaResponse = {
      ...area,
      isDeleted: 0,
      createdAt: new Date().toISOString(),
      updatedAt: new Date().toISOString(),
      createdBy: null,
      updatedBy: null
    };
    setSelectedArea(areaResponse);
    setIsDeleteDialogOpen(true);
  };

  // 打开状态切换对话框
  const handleToggleStatusDialog = (area: AreaNode) => {
    // 将 AreaNode 转换为 AreaResponse
    const areaResponse: AreaResponse = {
      ...area,
      isDeleted: 0,
      createdAt: new Date().toISOString(),
      updatedAt: new Date().toISOString(),
      createdBy: null,
      updatedBy: null
    };
    setSelectedArea(areaResponse);
    setIsStatusDialogOpen(true);
  };


  // 切换节点展开状态
  const handleToggleNode = (nodeId: number) => {
    setExpandedNodes(prev => {
      const newSet = new Set(prev);
      if (newSet.has(nodeId)) {
        newSet.delete(nodeId);
      } else {
        newSet.add(nodeId);
      }
      return newSet;
    });
  };

  // 重置筛选
  const handleResetFilters = () => {
    setKeyword('');
    setLevel('all');
    setParentId('');
    setIsDisabled('all');
    setPage(1);
  };

  // 获取层级显示名称
  const getLevelName = (level: number) => {
    switch (level) {
      case 1: return '省/直辖市';
      case 2: return '市';
      case 3: return '区/县';
      default: return '未知';
    }
  };

  return (
    <div className="space-y-6">
      <div className="flex items-center justify-between">
        <div>
          <h1 className="text-3xl font-bold tracking-tight">省市区管理</h1>
          <p className="text-muted-foreground">
            管理省市区三级联动数据
          </p>
        </div>
        <div className="flex gap-2">
          <Button
            variant={viewMode === 'table' ? 'default' : 'outline'}
            size="sm"
            onClick={() => setViewMode('table')}
          >
            <TableIcon className="mr-2 h-4 w-4" />
            表格视图
          </Button>
          <Button
            variant={viewMode === 'tree' ? 'default' : 'outline'}
            size="sm"
            onClick={() => setViewMode('tree')}
          >
            <ListTree className="mr-2 h-4 w-4" />
            树形视图
          </Button>
          <Button onClick={() => setIsCreateDialogOpen(true)}>
            <Plus className="mr-2 h-4 w-4" />
            新增省市区
          </Button>
        </div>
      </div>

      <Tabs value={viewMode} onValueChange={(value) => setViewMode(value as 'table' | 'tree')}>
        <TabsList className="mb-4">
          <TabsTrigger value="table">
            <TableIcon className="mr-2 h-4 w-4" />
            表格视图
          </TabsTrigger>
          <TabsTrigger value="tree">
            <ListTree className="mr-2 h-4 w-4" />
            树形视图
          </TabsTrigger>
        </TabsList>

        {/* 表格视图 */}
        <TabsContent value="table">
          <Card>
            <CardHeader>
              <CardTitle>省市区列表</CardTitle>
              <CardDescription>
                查看和管理所有省市区数据
              </CardDescription>
            </CardHeader>
            <CardContent>
          {/* 搜索和筛选区域 */}
          <div className="flex flex-col gap-4 mb-6">
            <div className="flex gap-4">
              <div className="flex-1">
                <div className="relative">
                  <Search className="absolute left-2 top-2.5 h-4 w-4 text-muted-foreground" />
                  <Input
                    placeholder="搜索省市区名称或代码..."
                    className="pl-8"
                    value={keyword}
                    onChange={(e) => {
                      setKeyword(e.target.value);
                      debouncedSearch(e.target.value);
                    }}
                  />
                </div>
              </div>
              <Button
                variant="outline"
                onClick={handleResetFilters}
                disabled={!keyword && level === 'all' && isDisabled === 'all'}
              >
                <RotateCcw className="mr-2 h-4 w-4" />
                重置
              </Button>
            </div>
            <div className="flex gap-4">
              <Select value={level} onValueChange={(value) => handleFilterChange('level', value)}>
                <SelectTrigger className="w-[180px]">
                  <SelectValue placeholder="选择层级" />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value="all">全部层级</SelectItem>
                  <SelectItem value="1">省/直辖市</SelectItem>
                  <SelectItem value="2">市</SelectItem>
                  <SelectItem value="3">区/县</SelectItem>
                </SelectContent>
              </Select>
              <Select value={isDisabled} onValueChange={(value) => handleFilterChange('isDisabled', value)}>
                <SelectTrigger className="w-[180px]">
                  <SelectValue placeholder="选择状态" />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value="all">全部状态</SelectItem>
                  <SelectItem value="0">启用</SelectItem>
                  <SelectItem value="1">禁用</SelectItem>
                </SelectContent>
              </Select>
            </div>
          </div>

          {/* 数据表格 */}
          <div className="rounded-md border">
            <Table>
              <TableHeader>
                <TableRow>
                  <TableHead>ID</TableHead>
                  <TableHead>名称</TableHead>
                  <TableHead>代码</TableHead>
                  <TableHead>层级</TableHead>
                  <TableHead>父级ID</TableHead>
                  <TableHead>状态</TableHead>
                  <TableHead>创建时间</TableHead>
                  <TableHead className="text-right">操作</TableHead>
                </TableRow>
              </TableHeader>
              <TableBody>
                {isLoading ? (
                  <TableRow>
                    <TableCell colSpan={8} className="text-center py-8">
                      加载中...
                    </TableCell>
                  </TableRow>
                ) : !data?.data || data.data.length === 0 ? (
                  <TableRow>
                    <TableCell colSpan={8} className="text-center py-8">
                      暂无数据
                    </TableCell>
                  </TableRow>
                ) : (
                  data.data.map((area) => (
                    <TableRow key={area.id}>
                      <TableCell className="font-medium">{area.id}</TableCell>
                      <TableCell>{area.name}</TableCell>
                      <TableCell>{area.code}</TableCell>
                      <TableCell>
                        <Badge variant="outline">
                          {getLevelName(area.level)}
                        </Badge>
                      </TableCell>
                      <TableCell>{area.parentId || '-'}</TableCell>
                      <TableCell>
                        <Badge variant={area.isDisabled === 0 ? 'default' : 'secondary'}>
                          {area.isDisabled === 0 ? '启用' : '禁用'}
                        </Badge>
                      </TableCell>
                      <TableCell>
                        {new Date(area.createdAt).toLocaleDateString('zh-CN')}
                      </TableCell>
                      <TableCell className="text-right">
                        <div className="flex justify-end gap-2">
                          <Button
                            variant="outline"
                            size="sm"
                            onClick={() => handleEdit(area)}
                          >
                            <Edit className="h-4 w-4" />
                          </Button>
                          <Button
                            variant="outline"
                            size="sm"
                            onClick={() => handleToggleStatusDialog(area)}
                          >
                            <Power className="h-4 w-4" />
                          </Button>
                          <Button
                            variant="outline"
                            size="sm"
                            onClick={() => handleDelete(area)}
                          >
                            <Trash2 className="h-4 w-4" />
                          </Button>
                        </div>
                      </TableCell>
                    </TableRow>
                  ))
                )}
              </TableBody>
            </Table>
          </div>

          {/* 分页 */}
          {data && (
            <div className="mt-4">
              <DataTablePagination
                currentPage={page}
                pageSize={pageSize}
                totalCount={data.pagination.total}
                onPageChange={(newPage, newPageSize) => {
                  setPage(newPage);
                  setPageSize(newPageSize);
                }}
              />
            </div>
          )}
        </CardContent>
      </Card>
        </TabsContent>

        {/* 树形视图 */}
        <TabsContent value="tree">
          <Card>
            <CardHeader>
              <CardTitle>省市区树形结构</CardTitle>
              <CardDescription>
                以树形结构查看和管理省市区层级关系
              </CardDescription>
            </CardHeader>
            <CardContent>
              {isTreeLoading ? (
                <div className="text-center py-8">
                  加载中...
                </div>
              ) : !treeData || treeData.length === 0 ? (
                <div className="text-center py-8">
                  暂无数据
                </div>
              ) : (
                <AreaTree
                  areas={treeData}
                  expandedNodes={expandedNodes}
                  onToggleNode={handleToggleNode}
                  onEdit={handleEdit}
                  onDelete={handleDelete}
                  onToggleStatus={handleToggleStatusDialog}
                />
              )}
            </CardContent>
          </Card>
        </TabsContent>
      </Tabs>

      {/* 创建省市区对话框 */}
      <Dialog open={isCreateDialogOpen} onOpenChange={setIsCreateDialogOpen}>
        <DialogContent className="max-w-2xl">
          <DialogHeader>
            <DialogTitle>新增省市区</DialogTitle>
            <DialogDescription>
              填写省市区信息
            </DialogDescription>
          </DialogHeader>
          <AreaForm
            onSubmit={handleCreateArea}
            isLoading={createMutation.isPending}
            onCancel={() => setIsCreateDialogOpen(false)}
          />
        </DialogContent>
      </Dialog>

      {/* 编辑省市区对话框 */}
      <Dialog open={isEditDialogOpen} onOpenChange={setIsEditDialogOpen}>
        <DialogContent className="max-w-2xl">
          <DialogHeader>
            <DialogTitle>编辑省市区</DialogTitle>
            <DialogDescription>
              修改省市区信息
            </DialogDescription>
          </DialogHeader>
          {selectedArea && (
            <AreaForm
              area={{
                id: selectedArea.id,
                parentId: selectedArea.parentId || undefined,
                name: selectedArea.name,
                level: selectedArea.level,
                code: selectedArea.code,
                isDisabled: selectedArea.isDisabled
              }}
              onSubmit={handleUpdateArea}
              isLoading={updateMutation.isPending}
              onCancel={() => {
                setIsEditDialogOpen(false);
                setSelectedArea(null);
              }}
            />
          )}
        </DialogContent>
      </Dialog>

      {/* 删除确认对话框 */}
      <AlertDialog open={isDeleteDialogOpen} onOpenChange={setIsDeleteDialogOpen}>
        <AlertDialogContent>
          <AlertDialogHeader>
            <AlertDialogTitle>确认删除</AlertDialogTitle>
            <AlertDialogDescription>
              确定要删除省市区 "{selectedArea?.name}" 吗？此操作不可恢复。
            </AlertDialogDescription>
          </AlertDialogHeader>
          <AlertDialogFooter>
            <AlertDialogCancel>取消</AlertDialogCancel>
            <AlertDialogAction
              onClick={handleDeleteArea}
              disabled={deleteMutation.isPending}
            >
              {deleteMutation.isPending ? '删除中...' : '确认删除'}
            </AlertDialogAction>
          </AlertDialogFooter>
        </AlertDialogContent>
      </AlertDialog>

      {/* 状态切换确认对话框 */}
      <AlertDialog open={isStatusDialogOpen} onOpenChange={setIsStatusDialogOpen}>
        <AlertDialogContent>
          <AlertDialogHeader>
            <AlertDialogTitle>
              {selectedArea?.isDisabled === 0 ? '禁用' : '启用'}确认
            </AlertDialogTitle>
            <AlertDialogDescription>
              确定要{selectedArea?.isDisabled === 0 ? '禁用' : '启用'}省市区 "{selectedArea?.name}" 吗？
            </AlertDialogDescription>
          </AlertDialogHeader>
          <AlertDialogFooter>
            <AlertDialogCancel>取消</AlertDialogCancel>
            <AlertDialogAction
              onClick={() => handleToggleStatus(selectedArea?.isDisabled === 0 ? 1 : 0)}
              disabled={toggleStatusMutation.isPending}
            >
              {toggleStatusMutation.isPending ? '处理中...' : '确认'}
            </AlertDialogAction>
          </AlertDialogFooter>
        </AlertDialogContent>
      </AlertDialog>
    </div>
  );
};