import React, { useEffect, useMemo, useState } from 'react';
import { Button, Input, InputNumber, Space, Switch, Table, Tag, Typography, message } from 'antd';
import { ReloadOutlined, SaveOutlined, UndoOutlined } from '@ant-design/icons';
import { SycmCard } from '../../components/Common';
import { getSystemConfig, updateSystemConfig } from '../../api/admin';
import { DEFAULT_SIDEBAR_CONFIG, parseSidebarConfig } from '../../config/sidebarNavigation';

const { Text } = Typography;

const clone = (value) => JSON.parse(JSON.stringify(value));

const SidebarSettings = () => {
  const [config, setConfig] = useState(() => clone(DEFAULT_SIDEBAR_CONFIG));
  const [loading, setLoading] = useState(false);
  const [saving, setSaving] = useState(false);

  const loadConfig = async () => {
    try {
      setLoading(true);
      const result = await getSystemConfig();
      setConfig(parseSidebarConfig(result?.sidebar_navigation));
    } catch (error) {
      message.error(error.response?.data?.error || '加载侧边栏设置失败');
    } finally {
      setLoading(false);
    }
  };

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

  const rows = useMemo(() => config.entries.flatMap((entry) => [
    { ...entry, rowKey: entry.key, depth: 0 },
    ...(entry.children || []).map((child) => ({ ...child, rowKey: `${entry.key}:${child.key}`, parentKey: entry.key, depth: 1, type: 'item' })),
  ]), [config.entries]);

  const updateRow = (record, patch) => {
    setConfig((current) => ({
      ...current,
      entries: current.entries.map((entry) => {
        if (!record.parentKey) return entry.key === record.key ? { ...entry, ...patch } : entry;
        if (entry.key !== record.parentKey) return entry;
        return {
          ...entry,
          children: (entry.children || []).map((child) => child.key === record.key ? { ...child, ...patch } : child),
        };
      }),
    }));
  };

  const handleSave = async () => {
    try {
      setSaving(true);
      await updateSystemConfig({ sidebar_navigation: JSON.stringify(config) });
      message.success('侧边栏设置已保存，刷新页面后生效');
    } catch (error) {
      message.error(error.response?.data?.error || '保存侧边栏设置失败');
    } finally {
      setSaving(false);
    }
  };

  const columns = [
    {
      title: '菜单名称',
      dataIndex: 'label',
      width: 280,
      render: (value, record) => (
        <div style={{ paddingLeft: record.depth ? 24 : 0 }}>
          <Input value={value} onChange={(event) => updateRow(record, { label: event.target.value })} />
        </div>
      ),
    },
    {
      title: '类型',
      dataIndex: 'type',
      width: 110,
      render: (value, record) => <Tag>{record.depth ? '子菜单' : value === 'group' ? '分组' : value === 'section' ? '分隔标题' : '菜单'}</Tag>,
    },
    {
      title: '标识',
      dataIndex: 'key',
      width: 170,
      render: (value) => <Text code>{value}</Text>,
    },
    {
      title: '顺序',
      dataIndex: 'order',
      width: 110,
      render: (value, record) => <InputNumber min={0} max={999} value={value} onChange={(next) => updateRow(record, { order: next ?? 0 })} />,
    },
    {
      title: '显示',
      dataIndex: 'visible',
      width: 90,
      render: (value, record) => <Switch checked={value !== false} onChange={(checked) => updateRow(record, { visible: checked })} />,
    },
    {
      title: '默认展开',
      dataIndex: 'defaultExpanded',
      width: 110,
      render: (value, record) => record.type === 'group'
        ? <Switch checked={Boolean(value)} onChange={(checked) => updateRow(record, { defaultExpanded: checked })} />
        : '-',
    },
  ];

  return (
    <div className="settings-tab-page">
      <SycmCard bodyStyle={{ padding: 16 }}>
        <div style={{ display: 'flex', justifyContent: 'space-between', gap: 16, marginBottom: 16, flexWrap: 'wrap' }}>
          <Space wrap>
            <Text strong>侧栏默认状态</Text>
            <Switch
              checked={!config.collapsedByDefault}
              checkedChildren="展开"
              unCheckedChildren="收起"
              onChange={(expanded) => setConfig((current) => ({ ...current, collapsedByDefault: !expanded }))}
            />
            <Text strong style={{ marginLeft: 12 }}>默认暗黑模式</Text>
            <Switch
              checked={Boolean(config.darkModeByDefault)}
              checkedChildren="开启"
              unCheckedChildren="关闭"
              onChange={(checked) => setConfig((current) => ({ ...current, darkModeByDefault: checked }))}
            />
          </Space>
          <Space wrap>
            <Button icon={<ReloadOutlined />} onClick={loadConfig} loading={loading}>刷新</Button>
            <Button icon={<UndoOutlined />} onClick={() => setConfig(clone(DEFAULT_SIDEBAR_CONFIG))}>恢复默认</Button>
            <Button type="primary" icon={<SaveOutlined />} onClick={handleSave} loading={saving}>保存设置</Button>
          </Space>
        </div>
        <Table rowKey="rowKey" columns={columns} dataSource={rows} loading={loading} pagination={false} scroll={{ x: 960 }} />
      </SycmCard>
    </div>
  );
};

export default SidebarSettings;