import React, { useState, useEffect, useCallback, useRef } from 'react';
import { Modal, Form, Select, Input, Button, message, Space, Spin } from 'antd';
import { SwapOutlined } from '@ant-design/icons';
import axios from 'axios';
import CloseButton from './CloseButton';
import { debounce } from '../utils/common';

const { Option } = Select;

const CableCreateModal = ({ visible, onClose, onSuccess, sourceDevice }) => {
  const [form] = Form.useForm();
  const [loading, setLoading] = useState(false);
  const [devices, setDevices] = useState([]);
  const [sourcePorts, setSourcePorts] = useState([]);
  const [targetPorts, setTargetPorts] = useState([]);
  const [fetchingDevices, setFetchingDevices] = useState(false);
  const devicesRef = useRef([]);

  const fetchDevices = useCallback(async (keyword = '') => {
    try {
      setFetchingDevices(true);
      const params = { pageSize: 100 };
      if (keyword && keyword.trim()) {
        params.keyword = keyword.trim();
      }
      console.log('[CableCreateModal] Fetching devices with params:', params);
      const response = await axios.get('/api/devices', { params });
      console.log('[CableCreateModal] API response:', response.data);
      const deviceList = response.data.devices || [];
      console.log('[CableCreateModal] Device list:', deviceList.length, 'devices');
      setDevices(deviceList);
      devicesRef.current = deviceList;
      return deviceList;
    } catch (error) {
      console.error('[CableCreateModal] Failed to fetch devices:', error);
      message.error('获取设备列表失败');
      return [];
    } finally {
      setFetchingDevices(false);
    }
  }, []);

  const handleDeviceSearch = useCallback(
    debounce(value => {
      fetchDevices(value);
    }, 300),
    [fetchDevices]
  );

  useEffect(() => {
    if (visible) {
      console.log('[CableCreateModal] Modal opened, sourceDevice:', sourceDevice);
      form.resetFields();
      setSourcePorts([]);
      setTargetPorts([]);
      setDevices([]);
      devicesRef.current = [];
      
      fetchDevices().then(deviceList => {
        console.log('[CableCreateModal] Devices fetched:', deviceList.length);
        const sourceDeviceId = sourceDevice?.deviceId || sourceDevice?.id;
        console.log('[CableCreateModal] sourceDeviceId:', sourceDeviceId);
        if (sourceDeviceId && deviceList.length > 0) {
          const deviceExists = deviceList.some(d => d.deviceId === sourceDeviceId);
          console.log('[CableCreateModal] Device exists in list:', deviceExists);
          if (deviceExists) {
            console.log('[CableCreateModal] Setting form value:', sourceDeviceId);
            form.setFieldsValue({
              sourceDeviceId: sourceDeviceId,
            });
            fetchDevicePorts(sourceDeviceId, 'source');
          }
        }
      });
    }
  }, [visible, sourceDevice?.deviceId, sourceDevice?.id, form, fetchDevices]);

  const fetchDevicePorts = async (deviceId, type) => {
    if (!deviceId) {
      if (type === 'source') setSourcePorts([]);
      else setTargetPorts([]);
      return;
    }

    try {
      const response = await axios.get(`/api/device-ports/device/${deviceId}`);
      const ports = response.data || [];
      if (type === 'source') {
        setSourcePorts(ports);
      } else {
        setTargetPorts(ports);
      }
    } catch (error) {
      console.error(`Failed to fetch ${type} ports:`, error);
      message.error('获取端口列表失败');
    }
  };

  const handleSourceDeviceChange = deviceId => {
    form.setFieldsValue({ sourcePort: undefined });
    fetchDevicePorts(deviceId, 'source');
  };

  const handleTargetDeviceChange = deviceId => {
    form.setFieldsValue({ targetPort: undefined });
    fetchDevicePorts(deviceId, 'target');
  };

  const handleSubmit = async () => {
    try {
      const values = await form.validateFields();
      setLoading(true);

      const sourceDev = devices.find(d => d.deviceId === values.sourceDeviceId);
      const targetDev = devices.find(d => d.deviceId === values.targetDeviceId);

      let payload = { ...values };

      if (sourceDev && targetDev && sourceDev.type !== 'switch' && targetDev.type === 'switch') {
        payload = {
          ...values,
          sourceDeviceId: values.targetDeviceId,
          sourcePort: values.targetPort,
          targetDeviceId: values.sourceDeviceId,
          targetPort: values.sourcePort,
        };
      }

      await axios.post('/api/cables', payload);

      message.success('接线创建成功');
      onSuccess?.();
      onClose();
    } catch (error) {
      if (error.errorFields) return;
      console.error('Failed to create cable:', error);
      message.error('接线创建失败');
    } finally {
      setLoading(false);
    }
  };

  return (
    <Modal
      title={
        <Space>
          <SwapOutlined style={{ color: '#1890ff' }} />
          <span>新增接线</span>
        </Space>
      }
      open={visible}
      closeIcon={<CloseButton />}
      onCancel={onClose}
      onOk={handleSubmit}
      confirmLoading={loading}
      width={600}
      maskClosable={false}
    >
      <Form form={form} layout="vertical">
        <Form.Item label="源设备" name="sourceDeviceId" rules={[{ required: true, message: '请选择源设备' }]}>
          <Select
            showSearch
            filterOption={false}
            placeholder={fetchingDevices ? '加载中...' : '搜索设备...'}
            loading={fetchingDevices}
            onSearch={handleDeviceSearch}
            onChange={handleSourceDeviceChange}
            notFoundContent={fetchingDevices ? <Spin size="small" /> : '暂无数据'}
          >
            {devices.map(device => (
              <Option key={device.deviceId} value={device.deviceId}>
                {device.name} ({device.deviceId})
              </Option>
            ))}
          </Select>
        </Form.Item>

        <Form.Item label="源端口" name="sourcePort" rules={[{ required: true, message: '请选择源端口' }]}>
          <Select
            placeholder="请先选择设备"
            disabled={!sourcePorts.length}
          >
            {sourcePorts.map(port => (
              <Option key={port.portId} value={port.portName}>
                {port.portName}
              </Option>
            ))}
          </Select>
        </Form.Item>

        <Form.Item label="目标设备" name="targetDeviceId" rules={[{ required: true, message: '请选择目标设备' }]}>
          <Select
            showSearch
            filterOption={false}
            placeholder={fetchingDevices ? '加载中...' : '搜索设备...'}
            loading={fetchingDevices}
            onSearch={handleDeviceSearch}
            onChange={handleTargetDeviceChange}
            notFoundContent={fetchingDevices ? <Spin size="small" /> : '暂无数据'}
          >
            {devices.map(device => (
              <Option key={device.deviceId} value={device.deviceId}>
                {device.name} ({device.deviceId})
              </Option>
            ))}
          </Select>
        </Form.Item>

        <Form.Item label="目标端口" name="targetPort" rules={[{ required: true, message: '请选择目标端口' }]}>
          <Select
            placeholder="请先选择设备"
            disabled={!targetPorts.length}
          >
            {targetPorts.map(port => (
              <Option key={port.portId} value={port.portName}>
                {port.portName}
              </Option>
            ))}
          </Select>
        </Form.Item>

        <Form.Item label="备注" name="notes">
          <Input.TextArea placeholder="接线备注信息" rows={2} />
        </Form.Item>
      </Form>
    </Modal>
  );
};

export default CableCreateModal;