import React, { useCallback, useEffect, useMemo, useState } from 'react';
import {
  Table,
  Button,
  Input,
  Space,
  Drawer,
  Form,
  Select,
  App,
  Tooltip,
  Switch,
  Badge,
  Typography,
  Tag,
  Row,
  Col,
} from 'antd';
import {
  PlusOutlined,
  SaveOutlined,
  DeleteOutlined,
  EditOutlined,
  SearchOutlined,
  SyncOutlined,
  MonitorOutlined,
  ReloadOutlined,
  LinkOutlined,
  WifiOutlined,
  CheckCircleOutlined,
  SafetyCertificateOutlined,
} from '@ant-design/icons';
import apiClient from '../../utils/apiClient';
import { buildApiUrl, API_ENDPOINTS } from '../../config/api';
import AdminModuleShell from '../../components/AdminModuleShell';
import ActionButton from '../../components/ActionButton';
import useSystemPageSize from '../../hooks/useSystemPageSize';

const { Text } = Typography;
const { TextArea } = Input;

const ONLINE_MINUTES = 10;

const TerminalManagement = () => {
  const { message, modal } = App.useApp();
  const [form] = Form.useForm();
  const pageSize = useSystemPageSize(10);

  const [terminals, setTerminals] = useState([]);
  const [terminalTypes, setTerminalTypes] = useState([]);
  const [loading, setLoading] = useState(true);

  const [keyword, setKeyword] = useState('');
  const [filterType, setFilterType] = useState('all');
  const [filterStatus, setFilterStatus] = useState('all');
  const [filterActivation, setFilterActivation] = useState('all');

  const [showDrawer, setShowDrawer] = useState(false);
  const [isEditing, setIsEditing] = useState(false);
  const [selectedTerminal, setSelectedTerminal] = useState(null);

  const fetchTerminalTypes = useCallback(async () => {
    try {
      const response = await apiClient.get(buildApiUrl(API_ENDPOINTS.DICT_DATA.BY_TYPE('client_platform')), {
        params: { parent_code: 'TERMINAL' },
      });
      if (response.code === '200') {
        setTerminalTypes(response.data.items || []);
      }
    } catch (error) {
      console.error('Failed to fetch terminal types:', error);
    }
  }, []);

  const fetchTerminals = useCallback(async () => {
    setLoading(true);
    try {
      const response = await apiClient.get(buildApiUrl(API_ENDPOINTS.TERMINALS.LIST), {
        params: { page: 1, size: 10000 },
      });
      if (response.code === '200') {
        setTerminals(response.data.items || []);
      }
    } catch {
      message.error('获取终端列表失败');
    } finally {
      setLoading(false);
    }
  }, [message]);

  useEffect(() => {
    fetchTerminalTypes();
    fetchTerminals();
  }, [fetchTerminalTypes, fetchTerminals]);

  const handleOpenModal = (terminal = null) => {
    if (terminal) {
      setIsEditing(true);
      setSelectedTerminal(terminal);
      form.setFieldsValue({
        ...terminal,
        status: terminal.status === 1,
      });
    } else {
      setIsEditing(false);
      setSelectedTerminal(null);
      form.resetFields();
      form.setFieldsValue({
        terminal_type: terminalTypes[0]?.dict_code,
        status: true,
      });
    }
    setShowDrawer(true);
  };

  const handleSave = async () => {
    try {
      const values = await form.validateFields();
      const payload = {
        ...values,
        status: values.status ? 1 : 0,
      };

      if (isEditing) {
        await apiClient.put(buildApiUrl(API_ENDPOINTS.TERMINALS.UPDATE(selectedTerminal.id)), payload);
        message.success('终端更新成功');
      } else {
        await apiClient.post(buildApiUrl(API_ENDPOINTS.TERMINALS.CREATE), payload);
        message.success('终端创建成功');
      }

      setShowDrawer(false);
      fetchTerminals();
    } catch (error) {
      if (!error.errorFields) {
        message.error('保存失败');
      }
    }
  };

  const handleDelete = (item) => {
    modal.confirm({
      title: '删除终端',
      content: `确定要删除 IMEI 为 ${item.imei} 的终端吗？`,
      okText: '确定',
      okType: 'danger',
      onOk: async () => {
        try {
          await apiClient.delete(buildApiUrl(API_ENDPOINTS.TERMINALS.DELETE(item.id)));
          message.success('删除成功');
          fetchTerminals();
        } catch {
          message.error('删除失败');
        }
      },
    });
  };

  const handleToggleStatus = async (item, checked) => {
    try {
      const newStatus = checked ? 1 : 0;
      await apiClient.post(buildApiUrl(API_ENDPOINTS.TERMINALS.STATUS(item.id)), null, {
        params: { status: newStatus },
      });
      setTerminals((prev) => prev.map((terminal) => (
        terminal.id === item.id ? { ...terminal, status: newStatus } : terminal
      )));
      message.success(`已${newStatus === 1 ? '启用' : '停用'}终端`);
    } catch {
      message.error('状态更新失败');
    }
  };

  const getTerminalTypeLabel = (code) => (
    terminalTypes.find((terminalType) => terminalType.dict_code === code)?.label_cn || code
  );

  const isOnline = (lastOnlineAt) => {
    if (!lastOnlineAt) return false;
    const diffMs = Date.now() - new Date(lastOnlineAt).getTime();
    return diffMs >= 0 && diffMs <= ONLINE_MINUTES * 60 * 1000;
  };

  const filteredTerminals = useMemo(() => terminals.filter((terminal) => {
    if (filterType !== 'all' && terminal.terminal_type !== filterType) {
      return false;
    }

    if (filterStatus !== 'all' && terminal.status !== Number.parseInt(filterStatus, 10)) {
      return false;
    }

    if (filterActivation === 'activated' && terminal.is_activated !== 1) {
      return false;
    }

    if (filterActivation === 'pending' && terminal.is_activated === 1) {
      return false;
    }

    if (!keyword) {
      return true;
    }

    const query = keyword.toLowerCase();
    return [
      terminal.imei,
      terminal.terminal_name,
      terminal.current_username,
      terminal.current_user_caption,
      terminal.mac_address,
      terminal.ip_address,
    ].some((field) => String(field || '').toLowerCase().includes(query));
  }), [terminals, filterType, filterStatus, filterActivation, keyword]);

  const activeCount = useMemo(() => terminals.filter((terminal) => terminal.status === 1).length, [terminals]);
  const activatedCount = useMemo(() => terminals.filter((terminal) => terminal.is_activated === 1).length, [terminals]);
  const onlineCount = useMemo(() => terminals.filter((terminal) => isOnline(terminal.last_online_at)).length, [terminals]);

  const columns = [
    {
      title: 'IMEI',
      dataIndex: 'imei',
      key: 'imei',
      width: 160,
      render: (text) => <Text code>{text}</Text>,
    },
    {
      title: '终端信息',
      key: 'terminal',
      width: 220,
      render: (_, record) => (
        <Space direction="vertical" size={0}>
          <Text strong>{record.terminal_name || '未命名终端'}</Text>
          <Space size={8}>
            <Tag color="orange">{getTerminalTypeLabel(record.terminal_type)}</Tag>
            {isOnline(record.last_online_at) ? <Tag color="green" icon={<WifiOutlined />}>在线</Tag> : <Tag>离线</Tag>}
          </Space>
        </Space>
      ),
    },
    {
      title: '绑定账号',
      key: 'user',
      width: 170,
      render: (_, record) => (
        record.current_user_caption ? (
          <Space direction="vertical" size={0}>
            <Text>{record.current_user_caption}</Text>
            <Text type="secondary" style={{ fontSize: 11 }}>({record.current_username})</Text>
          </Space>
        ) : (
          <Text type="secondary">未绑定</Text>
        )
      ),
    },
    {
      title: '网络与固件',
      key: 'network',
      width: 220,
      render: (_, record) => (
        <Space direction="vertical" size={0}>
          <Text type="secondary">IP：{record.ip_address || '-'}</Text>
          <Text type="secondary">MAC：{record.mac_address || '-'}</Text>
          <Text type="secondary">固件：{record.firmware_version || '-'}</Text>
        </Space>
      ),
    },
    {
      title: '状态',
      key: 'status',
      width: 110,
      render: (_, record) => (
        <Switch
          size="small"
          checked={record.status === 1}
          onChange={(checked) => handleToggleStatus(record, checked)}
        />
      ),
    },
    {
      title: '激活情况',
      dataIndex: 'is_activated',
      key: 'is_activated',
      width: 120,
      render: (value) => (
        value === 1
          ? <Badge status="success" text="已激活" />
          : <Badge status="default" text="未激活" />
      ),
    },
    {
      title: '最后在线',
      dataIndex: 'last_online_at',
      key: 'last_online_at',
      width: 180,
      render: (time) => (time ? new Date(time).toLocaleString() : '-'),
    },
    {
      title: '操作',
      key: 'action',
      fixed: 'right',
      width: 100,
      render: (_, record) => (
        <Space size={6}>
          <ActionButton tone="edit" variant="iconSm" tooltip="编辑" icon={<EditOutlined />} onClick={() => handleOpenModal(record)} />
          <ActionButton tone="delete" variant="iconSm" tooltip="删除" icon={<DeleteOutlined />} onClick={() => handleDelete(record)} />
        </Space>
      ),
    },
  ];

  return (
    <div className="terminal-management">
      <AdminModuleShell
        icon={<MonitorOutlined style={{ fontSize: 18, color: '#1d4ed8' }} />}
        title="终端管理"
        subtitle="维护终端设备全生命周期：注册、绑定、激活、启停与在线状态监控。"
        rightActions={(
          <Space>
            <Button icon={<ReloadOutlined />} className="btn-soft-blue" onClick={fetchTerminals} loading={loading}>刷新</Button>
            <Button type="primary" icon={<PlusOutlined />} onClick={() => handleOpenModal()}>添加终端</Button>
          </Space>
        )}
        stats={[
          {
            label: '设备总数',
            value: terminals.length,
            icon: <MonitorOutlined />,
            tone: 'blue',
            desc: '已纳入系统管理的终端设备总量',
          },
          {
            label: '启用设备',
            value: activeCount,
            icon: <CheckCircleOutlined />,
            tone: 'green',
            desc: '允许接入平台并正常提供服务的设备',
          },
          {
            label: '已激活设备',
            value: activatedCount,
            icon: <SafetyCertificateOutlined />,
            tone: 'violet',
            desc: '已完成激活或完成初始化绑定的设备',
          },
          {
            label: '在线设备',
            value: onlineCount,
            icon: <WifiOutlined />,
            tone: 'cyan',
            desc: `最近 ${ONLINE_MINUTES} 分钟内有心跳上报的设备`,
          },
        ]}
        toolbar={(
          <Space wrap>
            <Input
              placeholder="搜索 IMEI、名称、账号或网络信息..."
              prefix={<SearchOutlined />}
              value={keyword}
              onChange={(e) => setKeyword(e.target.value)}
              style={{ width: 280 }}
              allowClear
            />
            <Select value={filterType} onChange={setFilterType} style={{ width: 160 }}>
              <Select.Option value="all">所有类型</Select.Option>
              {terminalTypes.map((terminalType) => (
                <Select.Option key={terminalType.dict_code} value={terminalType.dict_code}>
                  {terminalType.label_cn}
                </Select.Option>
              ))}
            </Select>
            <Select value={filterStatus} onChange={setFilterStatus} style={{ width: 120 }}>
              <Select.Option value="all">所有状态</Select.Option>
              <Select.Option value="1">启用</Select.Option>
              <Select.Option value="0">停用</Select.Option>
            </Select>
            <Select value={filterActivation} onChange={setFilterActivation} style={{ width: 130 }}>
              <Select.Option value="all">全部激活状态</Select.Option>
              <Select.Option value="activated">已激活</Select.Option>
              <Select.Option value="pending">未激活</Select.Option>
            </Select>
            <Tooltip title={`最近 ${ONLINE_MINUTES} 分钟内有心跳即视为在线`}>
              <Button icon={<SyncOutlined />} className="btn-soft-blue" onClick={fetchTerminals} loading={loading} />
            </Tooltip>
          </Space>
        )}
      >
        <div className="console-table">
          <Table
            columns={columns}
            dataSource={filteredTerminals}
            loading={loading}
            rowKey="id"
            scroll={{ x: 1220 }}
            pagination={{ pageSize, showTotal: (count) => `共 ${count} 条记录` }}
          />
        </div>
      </AdminModuleShell>

      <Drawer
        open={showDrawer}
        title={isEditing ? '编辑终端' : '添加终端'}
        placement="right"
        width={720}
        onClose={() => setShowDrawer(false)}
        destroyOnClose
        extra={(
          <Space>
            <Button type="primary" icon={<SaveOutlined />} onClick={handleSave}>
              {isEditing ? '保存修改' : '创建终端'}
            </Button>
          </Space>
        )}
      >
        <Form form={form} layout="vertical" style={{ marginTop: 20 }}>
          <Row gutter={16}>
            <Col span={12}>
              <Form.Item name="imei" label="IMEI 号" rules={[{ required: true, message: '请输入 IMEI 号' }]}>
                <Input placeholder="设备唯一识别码" disabled={isEditing} />
              </Form.Item>
            </Col>
            <Col span={12}>
              <Form.Item name="terminal_name" label="终端名称">
                <Input placeholder="例如：会议室终端 A" />
              </Form.Item>
            </Col>
          </Row>

          <Row gutter={16}>
            <Col span={12}>
              <Form.Item name="terminal_type" label="终端类型" rules={[{ required: true, message: '请选择终端类型' }]}>
                <Select placeholder="选择终端硬件类型">
                  {terminalTypes.map((terminalType) => (
                    <Select.Option key={terminalType.dict_code} value={terminalType.dict_code}>
                      {terminalType.label_cn}
                    </Select.Option>
                  ))}
                </Select>
              </Form.Item>
            </Col>
            <Col span={12}>
              <Form.Item name="firmware_version" label="固件版本">
                <Input placeholder="例如：v1.0.3" prefix={<LinkOutlined />} />
              </Form.Item>
            </Col>
          </Row>

          <Row gutter={16}>
            <Col span={12}>
              <Form.Item name="mac_address" label="MAC 地址">
                <Input placeholder="例如：00:11:22:33:44:55" />
              </Form.Item>
            </Col>
            <Col span={12}>
              <Form.Item name="status" label="启用状态" valuePropName="checked">
                <Switch />
              </Form.Item>
            </Col>
          </Row>

          <Form.Item name="description" label="备注说明">
            <TextArea rows={3} placeholder="记录设备部署位置、资产编号或特殊说明" />
          </Form.Item>
        </Form>
      </Drawer>
    </div>
  );
};

export default TerminalManagement;