import React, { useCallback, useEffect, useMemo, useState } from 'react';
import {
  Table,
  Button,
  Input,
  Space,
  Drawer,
  Form,
  Select,
  App,
  Tooltip,
  Switch,
  InputNumber,
  Upload,
  Tag,
  Avatar,
  Row,
  Col,
  Typography,
} from 'antd';
import {
  PlusOutlined,
  SaveOutlined,
  DeleteOutlined,
  EditOutlined,
  SearchOutlined,
  GlobalOutlined,
  RobotOutlined,
  UploadOutlined,
  LinkOutlined,
  AppstoreOutlined,
  ReloadOutlined,
  ExportOutlined,
  PictureOutlined,
  CheckCircleOutlined,
  BlockOutlined,
} from '@ant-design/icons';
import httpService from '../../services/httpService';
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 APP_TYPE_OPTIONS = [
  { label: '全部类型', value: 'all' },
  { label: '原生应用', value: 'native' },
  { label: 'Web 应用', value: 'web' },
];

const STATUS_OPTIONS = [
  { label: '全部状态', value: 'all' },
  { label: '已启用', value: 'active' },
  { label: '已停用', value: 'inactive' },
];

const parseAppInfo = (appInfo) => {
  if (!appInfo) return {};
  if (typeof appInfo === 'object') return appInfo;

  try {
    return JSON.parse(appInfo);
  } catch {
    return {};
  }
};

const getAppEntryUrl = (app) => {
  const info = parseAppInfo(app.app_info);
  return app.app_type === 'native' ? info.apk_url : info.web_url;
};

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

  const [apps, setApps] = useState([]);
  const [loading, setLoading] = useState(true);
  const [showDrawer, setShowDrawer] = useState(false);
  const [isEditing, setIsEditing] = useState(false);
  const [selectedApp, setSelectedApp] = useState(null);
  const [filterAppType, setFilterAppType] = useState('all');
  const [filterStatus, setFilterStatus] = useState('all');
  const [searchQuery, setSearchQuery] = useState('');
  const [uploading, setUploading] = useState(false);

  const fetchApps = useCallback(async () => {
    setLoading(true);
    try {
      const response = await httpService.get(buildApiUrl(API_ENDPOINTS.EXTERNAL_APPS.LIST));
      if (response.code === '200') {
        setApps(response.data || []);
      }
    } catch {
      message.error('获取外部应用列表失败');
    } finally {
      setLoading(false);
    }
  }, [message]);

  useEffect(() => {
    fetchApps();
  }, [fetchApps]);

  const handleOpenModal = (app = null) => {
    if (app) {
      setIsEditing(true);
      setSelectedApp(app);
      form.setFieldsValue({
        ...app,
        app_info: parseAppInfo(app.app_info),
        is_active: app.is_active === 1 || app.is_active === true,
      });
    } else {
      setIsEditing(false);
      setSelectedApp(null);
      form.resetFields();
      form.setFieldsValue({
        app_type: 'native',
        is_active: true,
        sort_order: 0,
        app_info: {},
      });
    }
    setShowDrawer(true);
  };

  const handleSave = async () => {
    try {
      const values = await form.validateFields();
      const payload = {
        ...values,
        app_info: JSON.stringify(values.app_info || {}),
        is_active: values.is_active ? 1 : 0,
      };

      if (isEditing) {
        await httpService.put(buildApiUrl(API_ENDPOINTS.EXTERNAL_APPS.UPDATE(selectedApp.id)), payload);
        message.success('应用更新成功');
      } else {
        await httpService.post(buildApiUrl(API_ENDPOINTS.EXTERNAL_APPS.CREATE), payload);
        message.success('应用创建成功');
      }

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

  const handleDelete = (item) => {
    modal.confirm({
      title: '删除外部应用',
      content: `确定要删除应用“${item.app_name}”吗？此操作不可恢复。`,
      okText: '确定',
      okType: 'danger',
      onOk: async () => {
        try {
          await httpService.delete(buildApiUrl(API_ENDPOINTS.EXTERNAL_APPS.DELETE(item.id)));
          message.success('删除成功');
          fetchApps();
        } catch {
          message.error('删除失败');
        }
      },
    });
  };

  const handleFileUpload = async (options, type) => {
    const { file, onSuccess, onError } = options;
    setUploading(true);

    const uploadFormData = new FormData();
    const endpoint = type === 'apk' ? API_ENDPOINTS.EXTERNAL_APPS.UPLOAD_APK : API_ENDPOINTS.EXTERNAL_APPS.UPLOAD_ICON;
    const fieldName = type === 'apk' ? 'apk_file' : 'icon_file';
    uploadFormData.append(fieldName, file);

    try {
      const response = await httpService.post(buildApiUrl(endpoint), uploadFormData, {
        headers: { 'Content-Type': 'multipart/form-data' },
      });

      if (response.code === '200') {
        if (type === 'apk') {
          const apkData = response.data;
          const currentInfo = form.getFieldValue('app_info') || {};
          form.setFieldsValue({
            app_name: apkData.app_name || form.getFieldValue('app_name'),
            app_info: {
              ...currentInfo,
              version_name: apkData.version_name,
              package_name: apkData.package_name,
              apk_url: apkData.apk_url,
            },
          });
          message.success('APK 上传并解析成功');
        } else {
          form.setFieldsValue({ icon_url: response.data.icon_url });
          message.success('应用图标上传成功');
        }
        onSuccess(response.data);
      }
    } catch (error) {
      message.error('上传失败');
      onError(error);
    } finally {
      setUploading(false);
    }
  };

  const handleToggleStatus = async (item, checked) => {
    try {
      const newActive = checked ? 1 : 0;
      await httpService.put(buildApiUrl(API_ENDPOINTS.EXTERNAL_APPS.UPDATE(item.id)), { is_active: newActive });
      setApps((prev) => prev.map((app) => (
        app.id === item.id ? { ...app, is_active: newActive } : app
      )));
      message.success(`已${newActive ? '启用' : '禁用'}应用`);
    } catch {
      message.error('状态更新失败');
    }
  };

  const filteredApps = useMemo(() => apps.filter((app) => {
    if (filterAppType !== 'all' && app.app_type !== filterAppType) {
      return false;
    }

    const enabled = app.is_active === 1 || app.is_active === true;
    if (filterStatus === 'active' && !enabled) {
      return false;
    }
    if (filterStatus === 'inactive' && enabled) {
      return false;
    }

    if (!searchQuery) {
      return true;
    }

    const query = searchQuery.toLowerCase();
    const info = parseAppInfo(app.app_info);
    return [
      app.app_name,
      app.description,
      info.package_name,
      info.web_url,
      info.apk_url,
      info.version_name,
    ].some((field) => String(field || '').toLowerCase().includes(query));
  }), [apps, filterAppType, filterStatus, searchQuery]);

  const nativeCount = useMemo(() => apps.filter((app) => app.app_type === 'native').length, [apps]);
  const webCount = useMemo(() => apps.filter((app) => app.app_type === 'web').length, [apps]);
  const activeCount = useMemo(() => apps.filter((app) => app.is_active === 1 || app.is_active === true).length, [apps]);
  const iconMissingCount = useMemo(() => apps.filter((app) => !app.icon_url).length, [apps]);

  const columns = [
    {
      title: '应用',
      key: 'app',
      width: 240,
      render: (_, record) => (
        <Space>
          <Avatar shape="square" size={42} src={record.icon_url} icon={<AppstoreOutlined />} />
          <Space direction="vertical" size={0}>
            <Text strong>{record.app_name}</Text>
            <Text type="secondary">{record.description || '暂无描述'}</Text>
          </Space>
        </Space>
      ),
    },
    {
      title: '类型',
      dataIndex: 'app_type',
      key: 'app_type',
      width: 120,
      render: (type) => (
        type === 'native'
          ? <Tag icon={<RobotOutlined />} color="green">原生应用</Tag>
          : <Tag icon={<GlobalOutlined />} color="blue">Web 应用</Tag>
      ),
    },
    {
      title: '入口信息',
      key: 'info',
      render: (_, record) => {
        const info = parseAppInfo(record.app_info);
        return (
          <Space direction="vertical" size={0}>
            <Text type="secondary">版本：{info.version_name || '-'}</Text>
            {record.app_type === 'native' ? (
              <Text type="secondary" ellipsis style={{ maxWidth: 220 }}>
                包名：{info.package_name || '-'}
              </Text>
            ) : (
              <Text type="secondary" ellipsis style={{ maxWidth: 240 }}>
                地址：{info.web_url || '-'}
              </Text>
            )}
          </Space>
        );
      },
    },
    {
      title: '状态',
      key: 'status',
      width: 110,
      render: (_, record) => (
        <Switch
          size="small"
          checked={record.is_active === 1 || record.is_active === true}
          onChange={(checked) => handleToggleStatus(record, checked)}
        />
      ),
    },
    {
      title: '排序',
      dataIndex: 'sort_order',
      key: 'sort_order',
      align: 'center',
      width: 80,
    },
    {
      title: '操作',
      key: 'action',
      fixed: 'right',
      width: 140,
      render: (_, record) => (
        <Space size={6}>
          <ActionButton tone="view" variant="iconSm" tooltip="打开入口" icon={<ExportOutlined />} href={getAppEntryUrl(record)} target="_blank" disabled={!getAppEntryUrl(record)} />
          <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="external-app-management">
      <AdminModuleShell
        icon={<AppstoreOutlined style={{ fontSize: 18, color: '#1d4ed8' }} />}
        title="外部应用管理"
        subtitle="统一维护原生应用与 Web 应用入口，支持 APK 自动解析、图标上传和状态治理。"
        rightActions={(
          <Space>
            <Button icon={<ReloadOutlined />} className="btn-soft-blue" onClick={fetchApps} loading={loading}>刷新</Button>
            <Button type="primary" icon={<PlusOutlined />} onClick={() => handleOpenModal()}>添加应用</Button>
          </Space>
        )}
        stats={[
          {
            label: '应用总数',
            value: apps.length,
            icon: <AppstoreOutlined />,
            tone: 'blue',
            desc: '统一纳管的外部应用入口总量',
          },
          {
            label: '原生应用',
            value: nativeCount,
            icon: <RobotOutlined />,
            tone: 'green',
            desc: '通过 APK 分发和安装的原生应用',
          },
          {
            label: 'Web 应用',
            value: webCount,
            icon: <GlobalOutlined />,
            tone: 'cyan',
            desc: '通过浏览器访问的外部系统入口',
          },
          {
            label: '缺少图标',
            value: iconMissingCount,
            icon: <PictureOutlined />,
            tone: 'amber',
            desc: '建议补齐图标以统一系统视觉入口',
          },
          {
            label: '已启用',
            value: activeCount,
            icon: activeCount > 0 ? <CheckCircleOutlined /> : <BlockOutlined />,
            tone: 'violet',
            desc: '当前对用户可见并允许访问的应用数量',
          },
        ]}
        toolbar={(
          <Space wrap>
            <Select value={filterAppType} onChange={setFilterAppType} style={{ width: 140 }} options={APP_TYPE_OPTIONS} />
            <Select value={filterStatus} onChange={setFilterStatus} style={{ width: 140 }} options={STATUS_OPTIONS} />
            <Input
              placeholder="搜索名称、描述、包名或入口..."
              prefix={<SearchOutlined />}
              value={searchQuery}
              onChange={(e) => setSearchQuery(e.target.value)}
              style={{ width: 280 }}
              allowClear
            />
          </Space>
        )}
      >
        <div className="console-table">
          <Table
            columns={columns}
            dataSource={filteredApps}
            loading={loading}
            rowKey="id"
            scroll={{ x: 980 }}
            pagination={{ pageSize, showTotal: (count) => `共 ${count} 条记录` }}
          />
        </div>
      </AdminModuleShell>

      <Drawer
        open={showDrawer}
        title={isEditing ? '编辑外部应用' : '添加外部应用'}
        placement="right"
        width={680}
        onClose={() => setShowDrawer(false)}
        destroyOnClose
        extra={(
          <Space>
            <Button type="primary" icon={<SaveOutlined />} onClick={() => form.submit()}>
              {isEditing ? '保存修改' : '创建应用'}
            </Button>
          </Space>
        )}
      >
        <Form form={form} layout="vertical" style={{ marginTop: 20 }} onFinish={handleSave}>
          <Form.Item name="app_type" label="应用类型" rules={[{ required: true, message: '请选择应用类型' }]}>
            <Select>
              <Select.Option value="native">原生应用（Android APK）</Select.Option>
              <Select.Option value="web">Web 应用</Select.Option>
            </Select>
          </Form.Item>

          <Form.Item noStyle shouldUpdate={(prev, curr) => prev.app_type !== curr.app_type}>
            {({ getFieldValue }) => (
              getFieldValue('app_type') === 'native' ? (
                <div style={{ marginBottom: 16 }}>
                  <Upload customRequest={(options) => handleFileUpload(options, 'apk')} showUploadList={false}>
                    <Button icon={<UploadOutlined />} loading={uploading}>上传并自动解析 APK</Button>
                  </Upload>
                </div>
              ) : null
            )}
          </Form.Item>

          <Space align="start" style={{ width: '100%' }}>
            <Form.Item label="应用图标">
              <Upload customRequest={(options) => handleFileUpload(options, 'icon')} showUploadList={false}>
                <div style={{ cursor: 'pointer' }}>
                  <Form.Item noStyle shouldUpdate={(prev, curr) => prev.icon_url !== curr.icon_url}>
                    {({ getFieldValue }) => (
                      <Avatar
                        size={64}
                        shape="square"
                        src={getFieldValue('icon_url')}
                        icon={getFieldValue('icon_url') ? <PictureOutlined /> : <PlusOutlined />}
                        style={{ border: '1px dashed #d9d9d9', backgroundColor: '#fff' }}
                      />
                    )}
                  </Form.Item>
                </div>
              </Upload>
            </Form.Item>
            <Form.Item name="icon_url" hidden>
              <Input />
            </Form.Item>

            <div style={{ flex: 1 }}>
              <Form.Item name="app_name" label="应用名称" rules={[{ required: true, message: '请输入应用名称' }]}>
                <Input placeholder="请输入应用名称" />
              </Form.Item>
            </div>
          </Space>

          <Form.Item noStyle shouldUpdate={(prev, curr) => prev.app_type !== curr.app_type}>
            {({ getFieldValue }) => (
              getFieldValue('app_type') === 'native' ? (
                <>
                  <Row gutter={16}>
                    <Col span={8}>
                      <Form.Item
                        name={['app_info', 'version_name']}
                        label="版本名称"
                        rules={[{ required: true, message: '请输入版本名称' }]}
                      >
                        <Input placeholder="例如 1.0.0" />
                      </Form.Item>
                    </Col>
                    <Col span={16}>
                      <Form.Item
                        name={['app_info', 'package_name']}
                        label="应用包名"
                        rules={[{ required: true, message: '请输入应用包名' }]}
                      >
                        <Input placeholder="com.example.app" />
                      </Form.Item>
                    </Col>
                  </Row>
                  <Form.Item
                    name={['app_info', 'apk_url']}
                    label="APK 下载链接"
                    rules={[{ required: true, message: '请输入 APK 下载链接' }]}
                  >
                    <Input prefix={<LinkOutlined />} placeholder="https://..." />
                  </Form.Item>
                </>
              ) : (
                <>
                  <Row gutter={16}>
                    <Col span={8}>
                      <Form.Item name={['app_info', 'version_name']} label="版本名称">
                        <Input placeholder="可选，例如 1.2.0" />
                      </Form.Item>
                    </Col>
                    <Col span={16}>
                      <Form.Item
                        name={['app_info', 'web_url']}
                        label="Web 应用 URL"
                        rules={[{ required: true, message: '请输入 URL' }]}
                      >
                        <Input prefix={<GlobalOutlined />} placeholder="https://..." />
                      </Form.Item>
                    </Col>
                  </Row>
                </>
              )
            )}
          </Form.Item>

          <Form.Item name="description" label="应用描述">
            <TextArea rows={2} placeholder="简单描述该应用的用途..." />
          </Form.Item>

          <Row gutter={16}>
            <Col span={12}>
              <Form.Item name="sort_order" label="排序权重">
                <InputNumber style={{ width: '100%' }} min={0} />
              </Form.Item>
            </Col>
            <Col span={12}>
              <Form.Item name="is_active" label="状态" valuePropName="checked">
                <Switch />
              </Form.Item>
            </Col>
          </Row>
        </Form>
      </Drawer>
    </div>
  );
};

export default ExternalAppManagement;