import React, { useState, useEffect } from 'react';
import { useIntl } from 'umi';
import { Card, Table, Button, Modal, Form, Input, Space, message, Select, TreeSelect } from 'antd';
import { PlusOutlined, DeleteOutlined, ExclamationCircleOutlined, EditOutlined } from '@ant-design/icons';
import './friendLinkManage.less';

const { Option } = Select;

// 友情链接分类类型定义
interface CategoryType {
  id: string;
  name: string;
  parentId: string | null;
  level: number;
  sort: number;
  children?: CategoryType[];
  key?: string;
}

const FriendLinkCategory: React.FC = () => {
  const intl = useIntl();
  const [loading, setLoading] = useState<boolean>(false);
  const [modalVisible, setModalVisible] = useState<boolean>(false);
  const [isEdit, setIsEdit] = useState<boolean>(false);
  const [isAddChild, setIsAddChild] = useState<boolean>(false);
  const [currentCategory, setCurrentCategory] = useState<CategoryType | null>(null);
  const [categoryData, setCategoryData] = useState<CategoryType[]>([]);
  const [form] = Form.useForm();

  // 模拟分类数据
  const mockCategories: CategoryType[] = [
    {
      id: '1',
      name: '政府机构',
      parentId: null,
      level: 1,
      sort: 1,
      children: [
        {
          id: '1-1',
          name: '中央部委',
          parentId: '1',
          level: 2,
          sort: 1,
        },
        {
          id: '1-2',
          name: '地方政府',
          parentId: '1',
          level: 2,
          sort: 2,
          children: [
            {
              id: '1-2-1',
              name: '省级政府',
              parentId: '1-2',
              level: 3,
              sort: 1,
            },
            {
              id: '1-2-2',
              name: '市级政府',
              parentId: '1-2',
              level: 3,
              sort: 2,
            }
          ]
        }
      ]
    },
    {
      id: '2',
      name: '港口集团',
      parentId: null,
      level: 1,
      sort: 2,
      children: [
        {
          id: '2-1',
          name: '沿海港口',
          parentId: '2',
          level: 2,
          sort: 1,
        },
        {
          id: '2-2',
          name: '内河港口',
          parentId: '2',
          level: 2,
          sort: 2,
        }
      ]
    },
    {
      id: '3',
      name: '航运企业',
      parentId: null,
      level: 1,
      sort: 3,
    }
  ];

  // 获取分类列表
  const fetchCategoryList = () => {
    setLoading(true);
    // 实际项目中应调用API
    setTimeout(() => {
      // 为每个节点添加key属性，用于Table组件
      const processData = (data: CategoryType[]): CategoryType[] => {
        return data.map(item => {
          const newItem = { ...item, key: item.id };
          if (item.children && item.children.length > 0) {
            newItem.children = processData(item.children);
          }
          return newItem;
        });
      };

      const processedData = processData(mockCategories);
      setCategoryData(processedData);
      setLoading(false);
    }, 500);
  };

  // 首次加载时获取数据
  useEffect(() => {
    fetchCategoryList();
  }, []);

  // 获取所有分类（扁平化）用于选择父分类
  const getAllCategories = (categories: CategoryType[] = categoryData, result: CategoryType[] = []): CategoryType[] => {
    categories.forEach(category => {
      result.push(category);
      if (category.children && category.children.length > 0) {
        getAllCategories(category.children, result);
      }
    });
    return result;
  };

  // 处理添加分类
  const handleAddCategory = () => {
    setIsEdit(false);
    setIsAddChild(false);
    setCurrentCategory(null);
    form.resetFields();
    setModalVisible(true);
  };

  // 处理添加子分类
  const handleAddChildCategory = (record: CategoryType) => {
    setIsEdit(false);
    setIsAddChild(true);
    setCurrentCategory(record);
    form.resetFields();
    form.setFieldsValue({
      parentId: record.id,
    });
    setModalVisible(true);
  };

  // 处理编辑分类
  const handleEditCategory = (record: CategoryType) => {
    setIsEdit(true);
    setIsAddChild(false);
    setCurrentCategory(record);
    form.setFieldsValue({
      name: record.name,
      parentId: record.parentId,
      sort: record.sort,
    });
    setModalVisible(true);
  };

  // 处理删除分类
  const handleDeleteCategory = (record: CategoryType) => {
    // 检查是否有子分类
    if (record.children && record.children.length > 0) {
      message.error('该分类下有子分类，不能直接删除');
      return;
    }

    Modal.confirm({
      title: '删除分类',
      icon: <ExclamationCircleOutlined />,
      content: `确定要删除分类"${record.name}"吗？`,
      okText: '确定',
      okType: 'danger',
      cancelText: '取消',
      onOk() {
        // 实际项目中应调用API
        // 递归查找并删除分类
        const deleteCategory = (data: CategoryType[], id: string): CategoryType[] => {
          return data.filter(item => {
            if (item.id === id) {
              return false;
            }
            if (item.children && item.children.length > 0) {
              item.children = deleteCategory(item.children, id);
            }
            return true;
          });
        };

        const newData = deleteCategory(categoryData, record.id);
        setCategoryData(newData);
        message.success('删除成功');
      },
    });
  };

  // 处理表单提交
  const handleModalSubmit = () => {
    form.validateFields().then(values => {
      // 准备提交数据
      const formData = {
        ...values,
        level: values.parentId ? (isAddChild ? currentCategory!.level + 1 : 2) : 1,
      };

      if (isEdit && currentCategory) {
        // 编辑模式
        // 递归更新分类
        const updateCategory = (data: CategoryType[], id: string, newData: any): CategoryType[] => {
          return data.map(item => {
            if (item.id === id) {
              return { ...item, ...newData };
            }
            if (item.children && item.children.length > 0) {
              item.children = updateCategory(item.children, id, newData);
            }
            return item;
          });
        };

        const newData = updateCategory(categoryData, currentCategory.id, formData);
        setCategoryData(newData);
        message.success('更新成功');
      } else {
        // 新增模式
        const newId = isAddChild
          ? `${currentCategory!.id}-${Date.now().toString().substr(-4)}`
          : (categoryData.length + 1).toString();

        const newCategory: CategoryType = {
          id: newId,
          name: formData.name,
          parentId: formData.parentId,
          level: formData.level,
          sort: formData.sort || 99,
          key: newId,
        };

        if (formData.parentId) {
          // 有父分类，需要将新分类添加到父分类的children中
          const addChildToParent = (data: CategoryType[], parentId: string, newChild: CategoryType): CategoryType[] => {
            return data.map(item => {
              if (item.id === parentId) {
                if (!item.children) {
                  item.children = [];
                }
                item.children.push(newChild);
                return item;
              }
              if (item.children && item.children.length > 0) {
                item.children = addChildToParent(item.children, parentId, newChild);
              }
              return item;
            });
          };

          const newData = addChildToParent(categoryData, formData.parentId, newCategory);
          setCategoryData(newData);
        } else {
          // 无父分类，直接添加到顶级
          setCategoryData([...categoryData, newCategory]);
        }

        message.success('添加成功');
      }

      setModalVisible(false);
      form.resetFields();
    });
  };

  // 表格列定义
  const columns = [
    {
      title: '分类名称',
      dataIndex: 'name',
      key: 'name',
    },
    {
      title: '层级',
      dataIndex: 'level',
      key: 'level',
      width: 100,
    },
    {
      title: '排序',
      dataIndex: 'sort',
      key: 'sort',
      width: 100,
      sorter: (a: CategoryType, b: CategoryType) => a.sort - b.sort,
    },
    {
      title: '操作',
      key: 'operation',
      width: 250,
      render: (_: any, record: CategoryType) => (
        <Space size="middle">
          <Button type="link"  onClick={() => handleAddChildCategory(record)}>
            新增子类
          </Button>
          <Button type="link"  onClick={() => handleEditCategory(record)}>
            编辑
          </Button>
          <Button type="link"  onClick={() => handleDeleteCategory(record)}>
            删除
          </Button>
        </Space>
      ),
    },
  ];

  return (
    <div className="friend-link-category-container common-container">
      <div className="action-bar">
        <Button type="primary" icon={<PlusOutlined />} onClick={handleAddCategory}>
          新增分类
        </Button>
      </div>

      <div className='content-area'>
        <Table
          rowKey="id"
          columns={columns}
          dataSource={categoryData}
          loading={loading}
          pagination={false}
          expandable={{
            defaultExpandAllRows: true
          }}
        />
      </div>

      {/* 新增/编辑分类模态框 */}
      <Modal
        title={isEdit ? '编辑分类' : (isAddChild ? '新增子分类' : '新增分类')}
        visible={modalVisible}
        onOk={handleModalSubmit}
        onCancel={() => setModalVisible(false)}
        destroyOnClose
      >
        <Form
          form={form}
          layout="vertical"
        >
          <Form.Item
            name="name"
            label="分类名称"
            rules={[{ required: true, message: '请输入分类名称' }]}
          >
            <Input placeholder="请输入分类名称" />
          </Form.Item>

          <Form.Item
            name="parentId"
            label="父级分类"
            rules={[{ required: isAddChild, message: '请选择父级分类' }]}
          >
            <TreeSelect
              placeholder="请选择父级分类"
              allowClear
              treeData={categoryData.map(item => ({
                title: item.name,
                value: item.id,
                disabled: isEdit && currentCategory ? (item.id === currentCategory.id || item.parentId === currentCategory.id) : false,
                children: item.children?.map(child => ({
                  title: child.name,
                  value: child.id,
                  disabled: isEdit && currentCategory ? (child.id === currentCategory.id || child.parentId === currentCategory.id) : false,
                  children: child.children?.map(grandChild => ({
                    title: grandChild.name,
                    value: grandChild.id,
                    disabled: isEdit && currentCategory ? (grandChild.id === currentCategory.id || grandChild.parentId === currentCategory.id) : false,
                  }))
                }))
              }))}
              disabled={isAddChild}
            />
          </Form.Item>

          <Form.Item
            name="sort"
            label="排序"
            rules={[{ required: true, message: '请输入排序值' }]}
            initialValue={99}
          >
            <Input type="number" placeholder="请输入排序值，数字越小越靠前" />
          </Form.Item>
        </Form>
      </Modal>
    </div>
  );
};

export default FriendLinkCategory;