import getDefaultBranch from './get-default-branch.js';

import {getRepo} from './index.js';

/** Detects if the current view is on the default branch. To be used on file/folder/commit lists */

export default async function isDefaultBranch(): Promise<boolean> {

const repo = getRepo();

if (!repo) {

// Like /settings/repositories

return false;

}

const [type, ...parts] = repo.path.split('/');

if (parts.length === 0) {

// Exactly /user/repo, which is on the default branch

return true;

}

if (!['tree', 'blob', 'commits'].includes(type)) {

// Like /user/repo/pulls

return false;

}

// Don't use `getCurrentGitRef` because it requires too much DOM. This is good enough, it only fails when:

// defaultBranch === 'a/b' && currentBranch === 'a'

const path = parts.join('/');

const defaultBranch = await getDefaultBranch();

return path === defaultBranch || path.startsWith(`${defaultBranch}/`);

}