/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

import { URI } from 'vs/base/common/uri';

const SshProtocolMatcher = /^([^@:]+@)?([^:]+):/;
const SshUrlMatcher = /^([^@:]+@)?([^:]+):(.+)$/;
const AuthorityMatcher = /^([^@]+@)?([^:]+)(:\d+)?$/;
const SecondLevelDomainMatcher = /([^@:.]+\.[^@:.]+)(:\d+)?$/;
const RemoteMatcher = /^\s*url\s*=\s*(.+\S)\s*$/mg;
const AnyButDot = /[^.]/g;

export const AllowedSecondLevelDomains = [
	'github.com',
	'bitbucket.org',
	'visualstudio.com',
	'gitlab.com',
	'heroku.com',
	'azurewebsites.net',
	'ibm.com',
	'amazon.com',
	'amazonaws.com',
	'cloudapp.net',
	'rhcloud.com',
	'google.com',
	'azure.com'
];

function stripLowLevelDomains(domain: string): string | null {
	const match = domain.match(SecondLevelDomainMatcher);
	return match ? match[1] : null;
}

function extractDomain(url: string): string | null {
	if (url.indexOf('://') === -1) {
		const match = url.match(SshProtocolMatcher);
		if (match) {
			return stripLowLevelDomains(match[2]);
		} else {
			return null;
		}
	}
	try {
		const uri = URI.parse(url);
		if (uri.authority) {
			return stripLowLevelDomains(uri.authority);
		}
	} catch (e) {
		// ignore invalid URIs
	}
	return null;
}

export function getDomainsOfRemotes(text: string, allowedDomains: readonly string[]): string[] {
	const domains = new Set<string>();
	let match: RegExpExecArray | null;
	while (match = RemoteMatcher.exec(text)) {
		const domain = extractDomain(match[1]);
		if (domain) {
			domains.add(domain);
		}
	}

	const allowedDomainsSet = new Set(allowedDomains);
	return Array.from(domains)
		.map(key => allowedDomainsSet.has(key) ? key : key.replace(AnyButDot, 'a'));
}

function stripPort(authority: string): string | null {
	const match = authority.match(AuthorityMatcher);
	return match ? match[2] : null;
}

function normalizeRemote(host: string | null, path: string, stripEndingDotGit: boolean): string | null {
	if (host && path) {
		if (stripEndingDotGit && path.endsWith('.git')) {
			path = path.substr(0, path.length - 4);
		}
		return (path.indexOf('/') === 0) ? `${host}${path}` : `${host}/${path}`;
	}
	return null;
}

function extractRemote(url: string, stripEndingDotGit: boolean): string | null {
	if (url.indexOf('://') === -1) {
		const match = url.match(SshUrlMatcher);
		if (match) {
			return normalizeRemote(match[2], match[3], stripEndingDotGit);
		}
	}
	try {
		const uri = URI.parse(url);
		if (uri.authority) {
			return normalizeRemote(stripPort(uri.authority), uri.path, stripEndingDotGit);
		}
	} catch (e) {
		// ignore invalid URIs
	}
	return null;
}

export function getRemotes(text: string, stripEndingDotGit: boolean = false): string[] {
	const remotes: string[] = [];
	let match: RegExpExecArray | null;
	while (match = RemoteMatcher.exec(text)) {
		const remote = extractRemote(match[1], stripEndingDotGit);
		if (remote) {
			remotes.push(remote);
		}
	}
	return remotes;
}