/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the Source EULA. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/
import * as assert from 'assert';
import * as os from 'os';
import * as vscode from 'vscode';
import { InMemoryDocument } from '../util/inMemoryDocument';

export const joinLines = (...args: string[]) =>
	args.join(os.platform() === 'win32' ? '\r\n' : '\n');

export const noopToken = new class implements vscode.CancellationToken {
	_onCancellationRequestedEmitter = new vscode.EventEmitter<void>();
	onCancellationRequested = this._onCancellationRequestedEmitter.event;

	get isCancellationRequested() { return false; }
};

export const CURSOR = '$$CURSOR$$';

export function getCursorPositions(contents: string, doc: InMemoryDocument): vscode.Position[] {
	let positions: vscode.Position[] = [];
	let index = 0;
	let wordLength = 0;
	while (index !== -1) {
		index = contents.indexOf(CURSOR, index + wordLength);
		if (index !== -1) {
			positions.push(doc.positionAt(index));
		}
		wordLength = CURSOR.length;
	}
	return positions;
}

export function workspacePath(...segments: string[]): vscode.Uri {
	return vscode.Uri.joinPath(vscode.workspace.workspaceFolders![0].uri, ...segments);
}

export function assertRangeEqual(expected: vscode.Range, actual: vscode.Range, message?: string) {
	assert.strictEqual(expected.start.line, actual.start.line, message);
	assert.strictEqual(expected.start.character, actual.start.character, message);
	assert.strictEqual(expected.end.line, actual.end.line, message);
	assert.strictEqual(expected.end.character, actual.end.character, message);
}