import './more-dropdown-links.css';
import React from 'dom-chef';
import elementReady from 'element-ready';
import * as pageDetect from 'github-url-detection';

import features from '.';
import getDefaultBranch from '../github-helpers/get-default-branch';
import {buildRepoURL, getCurrentCommittish} from '../github-helpers';

export function createDropdownItem(label: string, url: string, attributes?: Record<string, string>): Element {
	return (
		<li {...attributes}>
			<a role="menuitem" className="dropdown-item" href={url}>
				{label}
			</a>
		</li>
	);
}

export async function unhideOverflowDropdown(): Promise<void> {
	// Wait for the tab bar to be loaded
	const repoNavigationBar = await elementReady('.UnderlineNav-body');
	repoNavigationBar!.parentElement!.classList.add('rgh-has-more-dropdown');
}

async function init(): Promise<void> {
	const reference = getCurrentCommittish() ?? await getDefaultBranch();
	const compareUrl = buildRepoURL('compare', reference);
	const commitsUrl = buildRepoURL('commits', reference);
	const branchesUrl = buildRepoURL('branches');
	const dependenciesUrl = buildRepoURL('network/dependencies');
	await unhideOverflowDropdown();

	// Wait for the nav dropdown to be loaded #5244
	const repoNavigationDropdown = await elementReady('.UnderlineNav-actions ul');
	repoNavigationDropdown!.append(
		<li className="dropdown-divider" role="separator"/>,
		createDropdownItem('Compare', compareUrl),
		pageDetect.isEnterprise() ? '' : createDropdownItem('Dependencies', dependenciesUrl),
		createDropdownItem('Commits', commitsUrl),
		createDropdownItem('Branches', branchesUrl),
	);
}

void features.add(import.meta.url, {
	include: [
		pageDetect.isRepo,
	],
	exclude: [
		pageDetect.isEmptyRepo,
	],
	awaitDomReady: false,
	init,
});