import { useEffect, useState } from 'react';
import { ProLayout, type MenuDataItem } from '@ant-design/pro-components';
import { Avatar, Button, DatePicker, Dropdown, Space, Typography } from 'antd';
import { Outlet, useLocation, useNavigate } from 'react-router-dom';
import { useQuery } from '@tanstack/react-query';
import { IconChevronDown, IconLogout, IconSettings, IconUser } from '@tabler/icons-react';
import dayjs from 'dayjs';
import { menuApi, type MenuResp } from '@/api/menu';
import { authApi } from '@/api/auth';
import { useAuthStore } from '@/stores/auth';
import { getMenuIcon } from '@/components/common/MenuIcon';
import ErrorBoundary from '@/components/common/ErrorBoundary';
import NotificationBell from '@/components/biz/NotificationBell';
import {
  COLOR_PRIMARY, COLOR_PRIMARY_LIGHT, GRAY, LAYOUT,
} from '@/theme/tokens';

const { Text } = Typography;

const COLLAPSE_KEY = 'ga-sider-collapsed';

/** API 메뉴 트리 → ProLayout MenuDataItem */
function toProMenu(menus: MenuResp[]): MenuDataItem[] {
  return menus.map((m) => {
    const item: MenuDataItem = {
      name:  m.menuName,
      path:  m.menuPath ?? `/_grp/${m.menuCode}`,
      key:   m.menuCode,
      icon:  getMenuIcon(m.menuCode, m.menuPath),
    };
    if (m.children?.length) item.children = toProMenu(m.children);
    return item;
  });
}

/** 로컬스토리지에서 collapse 상태 읽기 */
function readCollapsed(): boolean {
  try { return localStorage.getItem(COLLAPSE_KEY) === 'true'; } catch { return false; }
}

export default function MainLayout() {
  const navigate  = useNavigate();
  const location  = useLocation();
  const auth      = useAuthStore();
  const [settleMonth, setSettleMonth] = useState(dayjs());
  const [collapsed, setCollapsed]     = useState(readCollapsed);

  // collapse 상태 localStorage 저장
  useEffect(() => {
    try { localStorage.setItem(COLLAPSE_KEY, String(collapsed)); } catch { /* ignore */ }
  }, [collapsed]);

  const { data: menus = [] } = useQuery({
    queryKey: ['menu', 'my'],
    queryFn:  menuApi.myMenus,
  });

  const handleLogout = async () => {
    try { await authApi.logout(); } catch { /* ignore */ }
    localStorage.removeItem('accessToken');
    localStorage.removeItem('refreshToken');
    auth.clear();
    navigate('/login');
  };

  const displayName = auth.userName ?? auth.loginId ?? '관리자';
  const roleLabel   = auth.roles?.[0] ?? 'USER';

  const userMenuItems = [
    {
      key:     'profile',
      label:   '내 프로필',
      icon:    <IconUser size={14} />,
      onClick: () => navigate('/system/users'),
    },
    {
      key:     'config',
      label:   '시스템 설정',
      icon:    <IconSettings size={14} />,
      onClick: () => navigate('/system/config'),
    },
    { type: 'divider' as const },
    {
      key:     'logout',
      label:   '로그아웃',
      icon:    <IconLogout size={14} />,
      danger:  true,
      onClick: handleLogout,
    },
  ];

  return (
    <ProLayout
      title="GA 정산시스템"
      logo={
        <div style={{
          width: 32, height: 32, borderRadius: 8,
          background: COLOR_PRIMARY,
          display: 'flex', alignItems: 'center', justifyContent: 'center',
          color: '#fff', fontWeight: 700, fontSize: 14, letterSpacing: -0.5,
        }}>
          GA
        </div>
      }
      layout="mix"
      navTheme="light"
      contentWidth="Fluid"
      fixedHeader
      fixSiderbar
      siderWidth={LAYOUT.siderWidth}
      collapsed={collapsed}
      onCollapse={setCollapsed}
      menu={{ locale: false }}
      menuDataRender={() => toProMenu(menus)}
      location={{ pathname: location.pathname }}
      menuItemRender={(item, dom) => (
        <div
          onClick={() =>
            item.path && !item.path.startsWith('/_grp/') && navigate(item.path)
          }
        >
          {dom}
        </div>
      )}
      breadcrumbRender={(routers = []) => routers}
      onMenuHeaderClick={() => navigate('/')}
      token={{
        sider: {
          colorMenuBackground:      '#ffffff',
          colorTextMenuSelected:    COLOR_PRIMARY,
          colorBgMenuItemSelected:  COLOR_PRIMARY_LIGHT,
          colorTextMenuItemHover:   GRAY[800],
          colorTextMenu:            GRAY[600],
          colorTextMenuSecondary:   GRAY[500],
          colorTextSubMenuSelected: COLOR_PRIMARY,
        },
        header: {
          colorBgHeader:               '#ffffff',
          colorHeaderTitle:            GRAY[800],
          heightLayoutHeader:          LAYOUT.headerHeight,
          colorBgRightActionsItemHover: GRAY[100],
        },
        bgLayout: GRAY[50],
        colorTextAppListIconHover: COLOR_PRIMARY,
      }}
      actionsRender={() => [
        // 정산월 선택
        <Space key="month" size={6} align="center" style={{ marginRight: 4 }}>
          <Text style={{ fontSize: 12, color: GRAY[500], whiteSpace: 'nowrap' }}>정산월</Text>
          <DatePicker
            picker="month"
            value={settleMonth}
            onChange={(d) => d && setSettleMonth(d)}
            allowClear={false}
            format="YYYY-MM"
            size="small"
            style={{ width: 96 }}
          />
        </Space>,

        // 알림 벨 (NotificationBell — unread-count API 연동)
        <NotificationBell key="bell" />,
      ]}
      avatarProps={{
        size:  'small',
        style: {
          background:  COLOR_PRIMARY,
          color:       '#fff',
          fontWeight:  600,
          fontSize:    12,
        },
        src:   undefined,
        children: displayName.charAt(0),
        render: (_props, dom) => (
          <Dropdown
            menu={{ items: userMenuItems }}
            placement="bottomRight"
            trigger={['click']}
          >
            <Space
              style={{
                cursor:   'pointer',
                padding:  '4px 8px',
                borderRadius: 6,
                transition: 'background 0.2s',
              }}
              onMouseEnter={(e) => {
                (e.currentTarget as HTMLElement).style.background = GRAY[100];
              }}
              onMouseLeave={(e) => {
                (e.currentTarget as HTMLElement).style.background = 'transparent';
              }}
            >
              {dom}
              <div style={{ lineHeight: 1.2 }}>
                <div style={{ fontSize: 13, fontWeight: 600, color: GRAY[900] }}>{displayName}</div>
                <div style={{ fontSize: 11, color: GRAY[500] }}>{roleLabel}</div>
              </div>
              <IconChevronDown size={12} style={{ color: GRAY[400] }} />
            </Space>
          </Dropdown>
        ),
      }}
      footerRender={() => (
        <div style={{
          textAlign: 'center', padding: '8px 0',
          fontSize: 11, color: GRAY[400],
          borderTop: `1px solid ${GRAY[200]}`,
        }}>
          GA Commission System v1.0.0-alpha
        </div>
      )}
    >
      <ErrorBoundary>
        <Outlet />
      </ErrorBoundary>
    </ProLayout>
  );
}