import { IconFont } from '@gpustack/core-ui';
import { Link, useLocation, useNavigate } from '@umijs/max';
import { Menu } from 'antd';
import { createStyles } from 'antd-style';
import React, { useMemo } from 'react';

interface MenuItem {
  icon?: string;
  selectedIcon?: string;
  defaultIcon?: string;
  children?: MenuItem[];

  [key: string]: any;
}

interface HeaderMenuProps {
  menuData: MenuItem[];
  initialState?: Global.InitialStateType;
}

const useStyles = createStyles(({ css }) => {
  return {
    headerMenu: css`
      flex: 1;
      min-width: 0;
      background: transparent;
      border-bottom: none;
      line-height: inherit;

      &.ant-menu-horizontal {
        border-bottom: none;
      }
      &.ant-menu-horizontal > .ant-menu-item::after,
      &.ant-menu-horizontal > .ant-menu-submenu::after {
        display: none;
      }
      .ant-menu-title-content {
        display: inline-flex;
        align-items: center;
        gap: 8px;
      }
      .anticon {
        font-size: 16px;
      }
    `
  };
});

const isItemSelected = (item: MenuItem, pathname: string) => {
  return (
    pathname === item.path ||
    (Array.isArray(item.subMenu) && item.subMenu.includes(pathname))
  );
};

const HeaderMenu: React.FC<HeaderMenuProps> = (props) => {
  const { menuData } = props;
  const { styles } = useStyles();
  const location = useLocation();
  const navigate = useNavigate();

  const buildLeaf = (item: MenuItem) => {
    const selected = isItemSelected(item, location.pathname);
    return {
      key: item.path as string,
      label: (
        <Link
          prefetch="intent"
          to={(item.path as string).replace('/*', '')}
          target={item.target}
        >
          <span className="flex-center gap-8">
            <IconFont
              type={selected ? item.selectedIcon || '' : item.defaultIcon || ''}
            />
            <span>{item.name}</span>
          </span>
        </Link>
      )
    };
  };

  const items = useMemo(() => {
    return menuData.map((item) => {
      if (item.children && item.children.length > 0) {
        return {
          key: item.key,
          label: item.name,
          children: item.children.map((child) => buildLeaf(child))
        };
      }
      return buildLeaf(item);
    });
  }, [menuData, location.pathname]);

  const selectedKeys = useMemo(() => {
    const keys: string[] = [];
    for (const item of menuData) {
      const leaves =
        item.children && item.children.length > 0 ? item.children : [item];
      for (const leaf of leaves) {
        if (isItemSelected(leaf, location.pathname)) {
          keys.push(leaf.path as string);
        }
      }
    }
    return keys;
  }, [menuData, location.pathname]);

  const handleClick = ({ key }: { key: string }) => {
    if (key.startsWith('/')) {
      navigate(key.replace('/*', ''));
    }
  };

  return (
    <Menu
      className={styles.headerMenu}
      mode="horizontal"
      selectedKeys={selectedKeys}
      items={items}
      onClick={handleClick}
      triggerSubMenuAction="hover"
    />
  );
};

export default HeaderMenu;