import { useEffect, useState, useCallback } from 'react';
import {
  Table,
  Button,
  Space,
  Tag,
  message,
  Upload,
  Modal,
  Input,
  Drawer,
  Descriptions,
  Popconfirm,
  Form,
  Tabs,
  theme,
} from 'antd';
import {
  UploadOutlined,
  PlayCircleOutlined,
  PauseCircleOutlined,
  CloudDownloadOutlined,
  DeleteOutlined,
  ReloadOutlined,
  HeartOutlined,
  SettingOutlined,
} from '@ant-design/icons';
import type { PluginInfo, PluginStatus, PluginSchemaResponse } from '../api/plugins';
import {
  listPlugins,
  uploadPlugin,
  installPlugin,
  enablePlugin,
  disablePlugin,
  uninstallPlugin,
  purgePlugin,
  getPluginHealth,
  getPluginSchema,
  updatePluginConfig,
} from '../api/plugins';
import PluginSettingsForm from '../components/PluginSettingsForm';

const STATUS_CONFIG: Record<PluginStatus, { color: string; label: string }> = {
  uploaded: { color: '#475569', label: '已上传' },
  installed: { color: '#2563EB', label: '已安装' },
  enabled: { color: '#059669', label: '已启用' },
  running: { color: '#059669', label: '运行中' },
  disabled: { color: '#dc2626', label: '已禁用' },
  uninstalled: { color: '#9333EA', label: '已卸载' },
};

export default function PluginAdmin() {
  const [plugins, setPlugins] = useState<PluginInfo[]>([]);
  const [total, setTotal] = useState(0);
  const [page, setPage] = useState(1);
  const [loading, setLoading] = useState(false);
  const [uploadModalOpen, setUploadModalOpen] = useState(false);
  const [manifestText, setManifestText] = useState('');
  const [wasmFile, setWasmFile] = useState<File | null>(null);
  const [detailPlugin, setDetailPlugin] = useState<PluginInfo | null>(null);
  const [schemaData, setSchemaData] = useState<PluginSchemaResponse | null>(null);
  const [healthDetail, setHealthDetail] = useState<Record<string, unknown> | null>(null);
  const [actionLoading, setActionLoading] = useState<string | null>(null);
  const { token } = theme.useToken();

  const fetchPlugins = useCallback(async (p = page) => {
    setLoading(true);
    try {
      const result = await listPlugins(p);
      setPlugins(result.data);
      setTotal(result.total);
    } catch {
      message.error('加载插件列表失败');
    }
    setLoading(false);
  }, [page]);

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

  // 打开详情时加载 schema（含 settings）
  useEffect(() => {
    if (!detailPlugin) {
      setSchemaData(null);
      return;
    }
    getPluginSchema(detailPlugin.id)
      .then(setSchemaData)
      .catch(() => setSchemaData(null));
  }, [detailPlugin]);

  const handleUpload = async () => {
    if (!wasmFile || !manifestText.trim()) {
      message.warning('请选择 WASM 文件并填写 Manifest');
      return;
    }
    try {
      await uploadPlugin(wasmFile, manifestText);
      message.success('插件上传成功');
      setUploadModalOpen(false);
      setWasmFile(null);
      setManifestText('');
      fetchPlugins();
    } catch {
      message.error('插件上传失败');
    }
  };

  const handleAction = async (id: string, action: () => Promise<PluginInfo>, label: string) => {
    setActionLoading(id);
    try {
      await action();
      message.success(`${label}成功`);
      fetchPlugins();
      if (detailPlugin?.id === id) {
        setDetailPlugin(null);
      }
    } catch {
      message.error(`${label}失败`);
    }
    setActionLoading(null);
  };

  const handleHealthCheck = async (id: string) => {
    try {
      const result = await getPluginHealth(id);
      setHealthDetail(result.details);
    } catch {
      message.error('健康检查失败');
    }
  };

  const getActions = (record: PluginInfo) => {
    const id = record.id;
    const btns: React.ReactNode[] = [];

    switch (record.status) {
      case 'uploaded':
        btns.push(
          <Button
            key="install"
            size="small"
            icon={<CloudDownloadOutlined />}
            loading={actionLoading === id}
            onClick={() => handleAction(id, () => installPlugin(id), '安装')}
          >
            安装
          </Button>,
        );
        break;
      case 'installed':
        btns.push(
          <Button
            key="enable"
            size="small"
            type="primary"
            icon={<PlayCircleOutlined />}
            loading={actionLoading === id}
            onClick={() => handleAction(id, () => enablePlugin(id), '启用')}
          >
            启用
          </Button>,
        );
        break;
      case 'enabled':
      case 'running':
        btns.push(
          <Button
            key="disable"
            size="small"
            danger
            icon={<PauseCircleOutlined />}
            loading={actionLoading === id}
            onClick={() => handleAction(id, () => disablePlugin(id), '停用')}
          >
            停用
          </Button>,
        );
        break;
      case 'disabled':
        btns.push(
          <Button
            key="enable"
            size="small"
            type="primary"
            icon={<PlayCircleOutlined />}
            loading={actionLoading === id}
            onClick={() => handleAction(id, () => enablePlugin(id), '启用')}
          >
            启用
          </Button>,
          <Button
            key="uninstall"
            size="small"
            icon={<DeleteOutlined />}
            loading={actionLoading === id}
            onClick={() => handleAction(id, () => uninstallPlugin(id), '卸载')}
          >
            卸载
          </Button>,
        );
        break;
    }

    return btns;
  };

  const columns = [
    { title: '名称', dataIndex: 'name', key: 'name', width: 180 },
    { title: '版本', dataIndex: 'version', key: 'version', width: 80 },
    {
      title: '状态',
      dataIndex: 'status',
      key: 'status',
      width: 100,
      render: (status: PluginStatus) => {
        const cfg = STATUS_CONFIG[status] || { color: '#475569', label: status };
        return <Tag color={cfg.color}>{cfg.label}</Tag>;
      },
    },
    { title: '作者', dataIndex: 'author', key: 'author', width: 120 },
    {
      title: '描述',
      dataIndex: 'description',
      key: 'description',
      ellipsis: true,
    },
    {
      title: '操作',
      key: 'action',
      width: 320,
      render: (_: unknown, record: PluginInfo) => (
        <Space size="small">
          {getActions(record)}
          <Button size="small" onClick={() => setDetailPlugin(record)}>
            详情
          </Button>
          <Popconfirm
            title="确定要清除该插件记录吗？"
            onConfirm={() => handleAction(record.id, async () => { await purgePlugin(record.id); return record; }, '清除')}
          >
            <Button size="small" danger disabled={!['uninstalled', 'disabled', 'uploaded', 'installed'].includes(record.status)}>
              清除
            </Button>
          </Popconfirm>
        </Space>
      ),
    },
  ];

  return (
    <div style={{ padding: 24 }}>
      <div style={{ marginBottom: 16, display: 'flex', justifyContent: 'space-between' }}>
        <Space>
          <Button icon={<UploadOutlined />} type="primary" onClick={() => setUploadModalOpen(true)}>
            上传插件
          </Button>
          <Button icon={<ReloadOutlined />} onClick={() => fetchPlugins()}>
            刷新
          </Button>
        </Space>
      </div>

      <Table
        columns={columns}
        dataSource={plugins}
        rowKey="id"
        loading={loading}
        pagination={{
          current: page,
          total,
          pageSize: 20,
          onChange: (p) => setPage(p),
          showTotal: (t) => `共 ${t} 个插件`,
        }}
      />

      <Modal
        title="上传插件"
        open={uploadModalOpen}
        onOk={handleUpload}
        onCancel={() => setUploadModalOpen(false)}
        okText="上传"
        width={600}
      >
        <Form layout="vertical">
          <Form.Item label="WASM 文件" required>
            <Upload
              beforeUpload={(file) => {
                setWasmFile(file);
                return false;
              }}
              maxCount={1}
              accept=".wasm"
              fileList={[]}
              onRemove={() => setWasmFile(null)}
            >
              <Button icon={<UploadOutlined />}>选择 WASM 文件</Button>
            </Upload>
          </Form.Item>
          <Form.Item label="Manifest (TOML)" required>
            <Input.TextArea
              rows={12}
              value={manifestText}
              onChange={(e) => setManifestText(e.target.value)}
              placeholder="[metadata]
id = &quot;my-plugin&quot;
name = &quot;我的插件&quot;
version = &quot;0.1.0&quot;"
            />
          </Form.Item>
        </Form>
      </Modal>

      <Drawer
        title={detailPlugin ? `插件详情: ${detailPlugin.name}` : '插件详情'}
        open={!!detailPlugin}
        onClose={() => {
          setDetailPlugin(null);
          setHealthDetail(null);
          setSchemaData(null);
        }}
        width={500}
      >
        {detailPlugin && (
          <Tabs
            defaultActiveKey="info"
            items={[
              {
                key: 'info',
                label: '基本信息',
                children: (
                  <>
                    <Descriptions column={1} bordered size="small">
                      <Descriptions.Item label="ID">{detailPlugin.id}</Descriptions.Item>
                      <Descriptions.Item label="名称">{detailPlugin.name}</Descriptions.Item>
                      <Descriptions.Item label="版本">{detailPlugin.version}</Descriptions.Item>
                      <Descriptions.Item label="状态">
                        <Tag color={STATUS_CONFIG[detailPlugin.status]?.color}>
                          {STATUS_CONFIG[detailPlugin.status]?.label || detailPlugin.status}
                        </Tag>
                      </Descriptions.Item>
                      <Descriptions.Item label="作者">{detailPlugin.author || '-'}</Descriptions.Item>
                      <Descriptions.Item label="描述">{detailPlugin.description || '-'}</Descriptions.Item>
                      <Descriptions.Item label="安装时间">{detailPlugin.installed_at || '-'}</Descriptions.Item>
                      <Descriptions.Item label="启用时间">{detailPlugin.enabled_at || '-'}</Descriptions.Item>
                      <Descriptions.Item label="实体数量">{detailPlugin.entities.length}</Descriptions.Item>
                    </Descriptions>
                    <div style={{ marginTop: 16 }}>
                      <Button
                        icon={<HeartOutlined />}
                        onClick={() => handleHealthCheck(detailPlugin.id)}
                        style={{ marginBottom: 8 }}
                      >
                        健康检查
                      </Button>
                      {healthDetail && (
                        <pre
                          style={{
                            background: token.colorBgContainer,
                            padding: 12,
                            borderRadius: 6,
                            fontSize: 12,
                            overflow: 'auto',
                          }}
                        >
                          {JSON.stringify(healthDetail, null, 2)}
                        </pre>
                      )}
                    </div>
                  </>
                ),
              },
              ...(schemaData?.settings
                ? [
                    {
                      key: 'settings',
                      label: (
                        <span>
                          <SettingOutlined /> 配置
                        </span>
                      ),
                      children: (
                        <PluginSettingsForm
                          fields={schemaData.settings.fields}
                          values={detailPlugin.config as Record<string, unknown>}
                          recordVersion={detailPlugin.record_version}
                          onSave={async (config, version) => {
                            const updated = await updatePluginConfig(
                              detailPlugin.id,
                              config,
                              version,
                            );
                            setDetailPlugin({ ...detailPlugin, ...updated });
                          }}
                          readOnly={detailPlugin.status !== 'enabled' && detailPlugin.status !== 'running'}
                        />
                      ),
                    },
                  ]
                : []),
            ]}
          />
        )}
      </Drawer>
    </div>
  );
}