import React, { useState, useEffect } from 'react';
import { Input, Select, Row, Col, Table, Button, Form, Tooltip, message } from 'antd';
import { RightOutlined, LeftOutlined } from '@ant-design/icons';
import { getSupplierPage } from '@/servers/api/supplier';
import CategorySelector from '@/components/CategorySelector/CategorySelector';
import './SupplierSelector.less';

const { Option } = Select;

/**
 * SupplierSelector 组件的属性接口
 * @interface SupplierSelectorProps
 * @property {Function} [onSelect] - 当选择供应商发生变化时的回调函数
 * @property {any[]} [selectedSuppliers] - 初始已选择的供应商列表
 */
interface SupplierSelectorProps {
  onSelect?: (selected: any[]) => void;
  selectedSuppliers?: any[];
}

/**
 * 供应商数据项接口，对应后端SupplierPageVo
 * @interface SupplierItem
 * @property {string} id - 供应商ID
 * @property {string} name - 供应商名称
 * @property {string} [deptId] - 部门ID
 * @property {string} [deptName] - 部门名称
 * @property {string} [companyName] - 公司名称
 * @property {string} [categoryName] - 所属品类
 * @property {string} [levelName] - 最新评价等级
 * @property {Date} [admissionTime] - 准入时间
 * @property {Date} [evaluationTime] - 最新评价时间
 * @property {any} [key: string] - 其他属性
 */
interface SupplierItem {
  id: string;
  name: string;
  deptId?: string;
  deptName?: string;
  companyName?: string;
  categoryName?: string;
  levelName?: string;
  admissionTime?: Date;
  evaluationTime?: Date;
  [key: string]: any;
}

/**
 * 供应商选择器组件
 * 用于从系统中选择供应商数据，支持搜索过滤、分页加载、双列表展示
 *
 * @param {SupplierSelectorProps} props - 组件属性
 * @returns {React.ReactElement} 供应商选择器组件
 */
const SupplierSelector: React.FC<SupplierSelectorProps> = ({
  onSelect,
  selectedSuppliers: initialSelectedSuppliers = [],
}) => {
  // 表单实例，用于管理查询条件
  const [form] = Form.useForm();

  // 待选供应商数据列表
  const [tableListData, setTableListData] = useState<SupplierItem[]>([]);

  // 分页信息
  const [pagination, setPagination] = useState({ current: 1, pageSize: 10, total: 0 });

  // 加载状态
  const [loading, setLoading] = useState(false);

  // 左侧待选列表中已选中的项的ID
  const [leftSelected, setLeftSelected] = useState<React.Key[]>([]);

  // 右侧已选列表中选中的项的ID
  const [rightSelected, setRightSelected] = useState<React.Key[]>([]);

  // 最终已选择的供应商列表
  const [chosenSuppliers, setChosenSuppliers] = useState<SupplierItem[]>(initialSelectedSuppliers);

  // 查询参数
  const [queryParams, setQueryParams] = useState({
    pageNo: 1,
    pageSize: 10
  });

  /**
   * 监听初始已选供应商变化，更新内部状态
   */
  useEffect(() => {
    setChosenSuppliers(initialSelectedSuppliers);
  }, [initialSelectedSuppliers]);

  /**
   * 合并供应商列表并去重
   * @param {SupplierItem[]} suppliers - 原有的供应商列表
   * @param {SupplierItem[]} selected - 新选择的供应商列表
   * @returns {SupplierItem[]} 合并后的供应商列表，去除重复项
   */
  const filteredData = (suppliers: SupplierItem[], selected: SupplierItem[]) => {
    // 创建已有供应商ID的集合，用于快速查找
    const ids = new Set(suppliers.map((item: SupplierItem) => item.id));
    // 过滤出未在原列表中出现的供应商
    const newSelected = selected.filter((item: SupplierItem) => !ids.has(item.id));
    // 合并列表
    return [...suppliers, ...newSelected];
  };

  /**
   * 将左侧选中的供应商移动到右侧已选列表
   */
  const moveToRight = () => {
    // 获取左侧选中的供应商数据
    const selected = tableListData.filter((item: SupplierItem) => leftSelected.includes(item.id));
    // 合并到已选列表并去重
    const chosenSuppliersNew = filteredData(chosenSuppliers, selected);
    // 更新已选列表
    setChosenSuppliers(chosenSuppliersNew);
    // 清空左侧选择状态
    setLeftSelected([]);
    // 触发外部回调
    onSelect?.(chosenSuppliersNew);
  };

  /**
   * 将右侧选中的供应商从已选列表中移除
   */
  const moveToLeft = () => {
    // 过滤掉右侧选中的供应商
    const remaining = chosenSuppliers.filter((item: SupplierItem) => !rightSelected.includes(item.id));
    // 更新已选列表
    setChosenSuppliers(remaining);
    // 清空右侧选择状态
    setRightSelected([]);
    // 触发外部回调
    onSelect?.(remaining);
  };

  /**
   * 获取供应商列表数据
   */
  const fetchTableData = async () => {
    if (loading) return;

    setLoading(true);
    try {
      // 调用API获取供应商列表
      const response = await getSupplierPage(queryParams);

      if (response && response.code === 200) {
        // 请求成功，更新数据和分页信息
        setTableListData(response.data.records.map((item: any) => ({
          ...item,
          supplierName: item.name,
        })));
        setPagination({
          current: queryParams.pageNo,
          pageSize: queryParams.pageSize,
          total: response.data.total || 0
        });
      } else {
        // 请求失败，显示错误信息
        message.error(response?.message || '获取供应商列表失败');
        setTableListData([]);
        setPagination({ current: 1, pageSize: 10, total: 0 });
      }
    } catch (error) {
      // 处理异常情况
      console.error('获取供应商列表出错:', error);
      message.error('获取供应商列表失败，请稍后重试');
      setTableListData([]);
      setPagination({ current: 1, pageSize: 10, total: 0 });
    } finally {
      setLoading(false);
    }
  };

  /**
   * 当查询参数变化时，加载数据
   */
  useEffect(() => {
    fetchTableData();
  }, [queryParams]);

  /**
   * 组件初始挂载时，加载一次数据
   */
  useEffect(() => {
    const values = form.getFieldsValue();
    setQueryParams(prev => ({
      ...prev,
      ...values,
      pageNo: 1
    }));
  }, []); // 空依赖数组，只在组件挂载时执行一次

  /**
   * 处理查询表单提交
   * @param {any} values - 表单值
   */
  const handleSearch = (values: any) => {
    setQueryParams(prev => ({
      ...prev,
      ...values,
      pageNo: 1
    }));
  };

  /**
   * 重置查询表单并重新加载数据
   */
  const handleReset = () => {
    form.resetFields();
    const values = form.getFieldsValue();
    setQueryParams(prev => ({
      ...prev,
      ...values,
      pageNo: 1
    }));
  };

  /**
   * 处理表格分页变化
   * @param {any} paginationInfo - 分页信息
   */
  const handleTableChange = (paginationInfo: any) => {
    setQueryParams(prev => ({
      ...prev,
      pageNo: paginationInfo.current,
      pageSize: paginationInfo.pageSize
    }));
  };

  // 表格列定义
  const columns = [
    {
      title: '供应商名称',
      dataIndex: 'supplierName',
      ellipsis: true,
      render: (supplierName: string) => (
        <Tooltip placement="topLeft" title={supplierName}>
          {supplierName}
        </Tooltip>
      ),
    },
    {
      title: '统一社会信用代码',
      dataIndex: 'socialCreditCode',
      ellipsis: true,
      render: (socialCreditCode: string) => (
        <Tooltip placement="topLeft" title={socialCreditCode}>
          {socialCreditCode || '-'}
        </Tooltip>
      ),
    },
    {
      title: '准入品类',
      dataIndex: 'categoryName',
      ellipsis: true,
      render: (categoryName: string) => (
        <Tooltip placement="topLeft" title={categoryName}>
          {categoryName || '-'}
        </Tooltip>
      ),
    },

  ];

  return (
    <div className="supplier-selector">
      {/* 查询表单 */}
      <Form layout="inline" form={form} onFinish={handleSearch} style={{ marginBottom: 30 }}>
        <Form.Item name="name" label="供应商名称">
          <Input placeholder="供应商名称" allowClear />
        </Form.Item>

        <Form.Item name="deptId" label="部门">
          <Select placeholder="请选择部门" allowClear style={{ width: 150 }}>
            <Option value="1">采购部</Option>
            <Option value="2">技术部</Option>
            <Option value="3">质量部</Option>
          </Select>
        </Form.Item>

        <Form.Item name="categoryId" label="所属品类">
          <CategorySelector multiple={false} style={{ width: 150 }} />
        </Form.Item>

        <Form.Item>
          <Button type="primary" htmlType="submit">查询</Button>
        </Form.Item>
        <Form.Item>
          <Button onClick={handleReset}>重置</Button>
        </Form.Item>
      </Form>

      {/* 供应商选择区域 */}
      <Row gutter={16} className="supplier-lists">
        {/* 左侧待选列表 */}
        <Col span={10}>
          <div className="list-title">
            待选供应商
            <span className="search-count">{pagination.total}项</span>
          </div>
          <Table
            rowSelection={{
              type: 'checkbox',
              onChange: setLeftSelected,
              selectedRowKeys: leftSelected
            }}
            rowKey="id"
            dataSource={tableListData}
            columns={columns}
            loading={loading}
            pagination={pagination}
            onChange={handleTableChange}
          />
        </Col>

        {/* 中间操作按钮 */}
        <Col span={4} className="transfer-buttons">
          <Button
            type="primary"
            icon={<RightOutlined />}
            onClick={moveToRight}
            disabled={leftSelected.length === 0}
          />
          <Button
            icon={<LeftOutlined />}
            onClick={moveToLeft}
            disabled={rightSelected.length === 0}
          />
        </Col>

        {/* 右侧已选列表 */}
        <Col span={10}>
          <div className="list-title">
            已选供应商
            <span className="search-count">{chosenSuppliers.length}项</span>
          </div>
          <Table
            rowSelection={{
              type: 'checkbox',
              onChange: setRightSelected,
              selectedRowKeys: rightSelected
            }}
            columns={columns}
            dataSource={chosenSuppliers}
            rowKey="id"
            pagination={false}
          />
        </Col>
      </Row>
    </div>
  );
};

export default SupplierSelector;
