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

import { ExtensionContext } from 'vscode';
import { startClient, LanguageClientConstructor } from '../jsonClient';
import { ServerOptions, TransportKind, LanguageClientOptions, LanguageClient } from 'vscode-languageclient/node';

import * as fs from 'fs';
import { xhr, XHRResponse, getErrorStatusDescription } from 'request-light';

import TelemetryReporter from 'vscode-extension-telemetry';
import { RequestService } from '../requests';

let telemetry: TelemetryReporter | undefined;

// this method is called when vs code is activated
export function activate(context: ExtensionContext) {

	const clientPackageJSON = getPackageInfo(context);
	telemetry = new TelemetryReporter(clientPackageJSON.name, clientPackageJSON.version, clientPackageJSON.aiKey);

	const serverMain = `./server/${clientPackageJSON.main.indexOf('/dist/') !== -1 ? 'dist' : 'out'}/node/jsonServerMain`;
	const serverModule = context.asAbsolutePath(serverMain);

	// The debug options for the server
	const debugOptions = { execArgv: ['--nolazy', '--inspect=' + (6000 + Math.round(Math.random() * 999))] };

	// If the extension is launch in debug mode the debug server options are use
	// Otherwise the run options are used
	const serverOptions: ServerOptions = {
		run: { module: serverModule, transport: TransportKind.ipc },
		debug: { module: serverModule, transport: TransportKind.ipc, options: debugOptions }
	};

	const newLanguageClient: LanguageClientConstructor = (id: string, name: string, clientOptions: LanguageClientOptions) => {
		return new LanguageClient(id, name, serverOptions, clientOptions);
	};

	startClient(context, newLanguageClient, { http: getHTTPRequestService(), telemetry });
}

export function deactivate(): Promise<any> {
	return telemetry ? telemetry.dispose() : Promise.resolve(null);
}

interface IPackageInfo {
	name: string;
	version: string;
	aiKey: string;
	main: string;
}

function getPackageInfo(context: ExtensionContext): IPackageInfo {
	const location = context.asAbsolutePath('./package.json');
	try {
		return JSON.parse(fs.readFileSync(location).toString());
	} catch (e) {
		console.log(`Problems reading ${location}: ${e}`);
		return { name: '', version: '', aiKey: '', main: '' };
	}
}

function getHTTPRequestService(): RequestService {
	return {
		getContent(uri: string, _encoding?: string) {
			const headers = { 'Accept-Encoding': 'gzip, deflate' };
			return xhr({ url: uri, followRedirects: 5, headers }).then(response => {
				return response.responseText;
			}, (error: XHRResponse) => {
				return Promise.reject(error.responseText || getErrorStatusDescription(error.status) || error.toString());
			});
		}
	};
}