import React from 'dom-chef';
import select from 'select-dom';
import zipTextNodes from 'zip-text-nodes';
import {applyToLink} from 'shorten-repo-url';
import linkifyURLsCore from 'linkify-urls';
import linkifyIssuesCore from 'linkify-issues';

import getTextNodes from '../helpers/get-text-nodes.js';
import parseBackticksCore from './parse-backticks.js';
import {buildRepoURL} from './index.js';

// Shared class necessary to avoid also shortening the links
export const linkifiedURLClass = 'rgh-linkified-code';
export const linkifiedURLSelector = '.rgh-linkified-code';

export const codeElementsSelector = [
	// Sometimes formatted diffs are loaded later and discard our formatting #5870
	'.blob-code-inner:not(deferred-diff-lines.awaiting-highlight *)', // Code lines
	':not(.notranslate) > .notranslate', // Code blocks in comments. May be wrapped twice
];

export function shortenLink(link: HTMLAnchorElement): void {
	// Exclude the link if the closest element found is not `.comment-body`
	// This avoids shortening links in code and code suggestions, but still shortens them in review comments
	// https://github.com/refined-github/refined-github/pull/4759#discussion_r702460890
	if (link.closest([...codeElementsSelector, '.comment-body'])?.classList.contains('comment-body')) {
		applyToLink(link, location.href);
	}
}

export function linkifyIssues(
	currentRepo: {owner?: string; name?: string},
	element: Element,
	options: Partial<linkifyIssuesCore.TypeDomOptions> = {},
): void {
	const linkified = linkifyIssuesCore(element.textContent!, {
		user: currentRepo.owner ?? '/',
		repository: currentRepo.name ?? '/',
		type: 'dom',
		baseUrl: '',
		...options,
		attributes: {
			class: linkifiedURLClass, // Necessary to avoid also shortening the links
			...options.attributes,
		},
	});
	if (linkified.children.length === 0) { // Children are <a>
		return;
	}

	// Enable native issue title fetch
	for (const link of linkified.children as HTMLCollectionOf<HTMLAnchorElement>) {
		const issue = link.href.split('/').pop();
		link.setAttribute('class', 'issue-link js-issue-link');
		link.dataset.errorText = 'Failed to load title';
		link.dataset.permissionText = 'Title is private';
		link.dataset.url = link.href;
		link.dataset.id = `rgh-issue-${issue!}`;
		link.dataset.hovercardType = 'issue';
		link.dataset.hovercardUrl = `${link.pathname}/hovercard`;
	}

	zipTextNodes(element, linkified);
}

export function linkifyURLs(element: Element): Element[] | void {
	if (element.textContent!.length < 15) { // Must be long enough for a URL
		return;
	}

	if (select.exists(linkifiedURLSelector, element)) {
		return select.all(linkifiedURLSelector, element);
	}

	const linkified = linkifyURLsCore(element.textContent!, {
		type: 'dom' as const,
		attributes: {
			rel: 'noreferrer noopener',
			class: linkifiedURLClass, // Necessary to avoid also shortening the links
		},
	});

	if (linkified.lastChild?.textContent === '…') { // Link is followed by …
		return;
	}

	if (linkified.children.length === 0) { // Children are <a>
		return;
	}

	zipTextNodes(element, linkified);
}

export function parseBackticks(element: Element): void {
	for (const node of getTextNodes(element)) {
		const fragment = parseBackticksCore(node.textContent!);

		if (fragment.children.length > 0) {
			node.replaceWith(fragment);
		}
	}
}

export function linkifyCommit(sha: string): JSX.Element {
	// Data attributes copied from the commit in https://github.com/refined-github/github-url-detection/releases/tag/v7.1.2
	return (
		<code>
			<a
				className="Link--secondary"
				href={buildRepoURL('commit', sha)}
				data-hovercard-type="commit"
				data-hovercard-url={buildRepoURL('commit', sha, 'hovercard')}
			>
				{sha.slice(0, 7)}
			</a>
		</code>
	);
}