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

'use strict';

import * as fs from 'fs-extra';
import * as handlebars from 'handlebars';
import * as path from 'path';
import * as vscode from 'vscode';

import * as Constants from './constants';
import * as nls from 'vscode-nls';

const localize = nls.loadMessageBundle();

/**
 * Helper to log messages to the developer console if enabled
 * @param msg Message to log to the console
 */
export function logDebug(msg: any): void {
	let config = vscode.workspace.getConfiguration(Constants.extensionConfigSectionName);
	let logDebugInfo = config[Constants.configLogDebugInfo];
	if (logDebugInfo === true) {
		let currentTime = new Date().toLocaleTimeString();
		let outputMsg = '[' + currentTime + ']: ' + msg ? msg.toString() : '';
		console.log(outputMsg);
	}
}

export function renderTemplateHtml(extensionPath: string, templateName: string, templateValues: object): Thenable<string> {
	let templatePath = path.join(extensionPath, 'resources', templateName);

	// 1) Read the template from the disk
	// 2) Compile it as a handlebars template and render the HTML
	// 3) On failure, return a simple string as an error
	return fs.readFile(templatePath, 'utf-8')
		.then(templateText => {
			let template = handlebars.compile(templateText);
			return template(templateValues);
		})
		.then(
			undefined,
			error => {
				logDebug(error);
				return localize('errorLoadingTab', 'An error occurred while loading the tab');
			}
		);
}