/**
 * 批量导入用户弹窗
 */

import React, { useState } from 'react';
import {
  Modal,
  Upload,
  Button,
  Select,
  Alert,
  Table,
  Space,
  Typography,
  message,
  Divider,
} from 'antd';
import { InboxOutlined, DownloadOutlined } from '@ant-design/icons';
import type { UploadFile } from 'antd/es/upload/interface';
import * as XLSX from 'xlsx';
import * as userApi from '../api/userApi';
import type { TenantOption, ImportUserRow, ImportResult } from '../types/user';

const { Dragger } = Upload;
const { Text } = Typography;

interface ImportUserModalProps {
  visible: boolean;
  onClose: () => void;
  onSuccess: () => void;
  tenantOptions: TenantOption[];
}

const ImportUserModal: React.FC<ImportUserModalProps> = ({
  visible,
  onClose,
  onSuccess,
  tenantOptions,
}) => {
  const [step, setStep] = useState<'upload' | 'preview' | 'result'>('upload');
  const [fileList, setFileList] = useState<UploadFile[]>([]);
  const [parsedData, setParsedData] = useState<ImportUserRow[]>([]);
  const [defaultTenantId, setDefaultTenantId] = useState<string>();
  const [importing, setImporting] = useState(false);
  const [importResult, setImportResult] = useState<ImportResult | null>(null);

  // 重置状态
  const resetState = () => {
    setStep('upload');
    setFileList([]);
    setParsedData([]);
    setDefaultTenantId(undefined);
    setImportResult(null);
  };

  // 关闭弹窗
  const handleClose = () => {
    resetState();
    onClose();
  };

  // 解析Excel文件
  const parseExcel = (file: File): Promise<ImportUserRow[]> => {
    return new Promise((resolve, reject) => {
      const reader = new FileReader();
      reader.onload = (e) => {
        try {
          const data = e.target?.result;
          const workbook = XLSX.read(data, { type: 'binary' });
          const sheetName = workbook.SheetNames[0];
          const worksheet = workbook.Sheets[sheetName];
          const jsonData = XLSX.utils.sheet_to_json<any>(worksheet);
          
          // 映射列名
          const rows: ImportUserRow[] = jsonData.map((row) => ({
            phone: String(row['手机号'] || row['phone'] || '').trim(),
            name: String(row['姓名'] || row['name'] || '').trim(),
            email: row['邮箱'] || row['email'] || undefined,
            role: row['角色'] || row['role'] || undefined,
            tenantCode: row['租户代码'] || row['tenantCode'] || undefined,
            departmentName: row['科室'] || row['departmentName'] || undefined,
            modules: row['模块'] || row['modules'] || undefined,
          }));

          resolve(rows);
        } catch (error) {
          reject(error);
        }
      };
      reader.onerror = reject;
      reader.readAsBinaryString(file);
    });
  };

  // 处理文件上传
  const handleUpload = async (file: File) => {
    try {
      const rows = await parseExcel(file);
      if (rows.length === 0) {
        message.error('文件中没有数据');
        return false;
      }
      setParsedData(rows);
      setStep('preview');
    } catch (error) {
      message.error('解析文件失败');
    }
    return false;
  };

  // 执行导入
  const handleImport = async () => {
    if (!defaultTenantId) {
      message.warning('请选择默认租户');
      return;
    }

    setImporting(true);
    try {
      const result = await userApi.importUsers(parsedData, defaultTenantId);
      setImportResult(result);
      setStep('result');
      if (result.success > 0) {
        onSuccess();
      }
    } catch (error) {
      message.error('导入失败');
    } finally {
      setImporting(false);
    }
  };

  // 下载模板
  const downloadTemplate = () => {
    const template = [
      {
        '手机号': '13800138000',
        '姓名': '张三',
        '邮箱': 'zhangsan@example.com',
        '角色': 'USER',
        '租户代码': '',
        '科室': '',
        '模块': 'AIA,PKB',
      },
    ];
    const ws = XLSX.utils.json_to_sheet(template);
    const wb = XLSX.utils.book_new();
    XLSX.utils.book_append_sheet(wb, ws, '用户导入模板');
    XLSX.writeFile(wb, '用户导入模板.xlsx');
  };

  // 预览表格列
  const previewColumns = [
    { title: '手机号', dataIndex: 'phone', key: 'phone', width: 130 },
    { title: '姓名', dataIndex: 'name', key: 'name', width: 100 },
    { title: '邮箱', dataIndex: 'email', key: 'email', width: 180 },
    { title: '角色', dataIndex: 'role', key: 'role', width: 100 },
    { title: '租户代码', dataIndex: 'tenantCode', key: 'tenantCode', width: 100 },
    { title: '科室', dataIndex: 'departmentName', key: 'departmentName', width: 100 },
    { title: '模块', dataIndex: 'modules', key: 'modules', width: 120 },
  ];

  // 错误表格列
  const errorColumns = [
    { title: '行号', dataIndex: 'row', key: 'row', width: 80 },
    { title: '手机号', dataIndex: 'phone', key: 'phone', width: 130 },
    { title: '错误原因', dataIndex: 'error', key: 'error' },
  ];

  return (
    <Modal
      title="批量导入用户"
      open={visible}
      onCancel={handleClose}
      width={800}
      footer={null}
      destroyOnClose
    >
      {step === 'upload' && (
        <>
          <Alert
            message="导入说明"
            description={
              <ul style={{ margin: 0, paddingLeft: 20 }}>
                <li>支持 .xlsx 或 .xls 格式的Excel文件</li>
                <li>必填字段：手机号、姓名</li>
                <li>角色可选值：SUPER_ADMIN、HOSPITAL_ADMIN、PHARMA_ADMIN、DEPARTMENT_ADMIN、USER</li>
                <li>模块字段使用逗号分隔，如：AIA,PKB,RVW</li>
              </ul>
            }
            type="info"
            showIcon
            style={{ marginBottom: 16 }}
          />

          <div style={{ marginBottom: 16 }}>
            <Button icon={<DownloadOutlined />} onClick={downloadTemplate}>
              下载导入模板
            </Button>
          </div>

          <Dragger
            accept=".xlsx,.xls"
            fileList={fileList}
            beforeUpload={handleUpload}
            onChange={({ fileList }) => setFileList(fileList)}
            maxCount={1}
          >
            <p className="ant-upload-drag-icon">
              <InboxOutlined />
            </p>
            <p className="ant-upload-text">点击或拖拽文件到此区域上传</p>
            <p className="ant-upload-hint">支持 .xlsx 或 .xls 格式</p>
          </Dragger>
        </>
      )}

      {step === 'preview' && (
        <>
          <Alert
            message={`共解析 ${parsedData.length} 条数据，请确认后导入`}
            type="info"
            showIcon
            style={{ marginBottom: 16 }}
          />

          <div style={{ marginBottom: 16 }}>
            <Space>
              <Text>默认租户：</Text>
              <Select
                placeholder="请选择默认租户"
                value={defaultTenantId}
                onChange={setDefaultTenantId}
                style={{ width: 250 }}
                options={tenantOptions.map((t) => ({
                  value: t.id,
                  label: `${t.name} (${t.code})`,
                }))}
              />
            </Space>
          </div>

          <Table
            columns={previewColumns}
            dataSource={parsedData.map((row, i) => ({ ...row, key: i }))}
            size="small"
            scroll={{ x: 800, y: 300 }}
            pagination={false}
          />

          <Divider />

          <Space style={{ width: '100%', justifyContent: 'flex-end' }}>
            <Button onClick={() => setStep('upload')}>上一步</Button>
            <Button type="primary" loading={importing} onClick={handleImport}>
              开始导入
            </Button>
          </Space>
        </>
      )}

      {step === 'result' && importResult && (
        <>
          <Alert
            message={`导入完成：成功 ${importResult.success} 条，失败 ${importResult.failed} 条`}
            type={importResult.failed === 0 ? 'success' : 'warning'}
            showIcon
            style={{ marginBottom: 16 }}
          />

          {importResult.errors.length > 0 && (
            <>
              <Text strong style={{ display: 'block', marginBottom: 8 }}>
                失败记录：
              </Text>
              <Table
                columns={errorColumns}
                dataSource={importResult.errors.map((e, i) => ({ ...e, key: i }))}
                size="small"
                scroll={{ y: 200 }}
                pagination={false}
              />
            </>
          )}

          <Divider />

          <Space style={{ width: '100%', justifyContent: 'flex-end' }}>
            <Button onClick={resetState}>继续导入</Button>
            <Button type="primary" onClick={handleClose}>
              完成
            </Button>
          </Space>
        </>
      )}
    </Modal>
  );
};

export default ImportUserModal;