import * as os from 'os';

import { CancellationToken, debug, OutputChannel, workspace, Uri } from 'vscode';

import { PythonSettings } from '../../common/configSettings';

import { execPythonFile } from './../../common/utils';

import { createDeferred } from './../../common/helpers';

const pythonSettings = PythonSettings.getInstance();

export function launchDebugger(rootDirectory: string, testArgs: string[], token?: CancellationToken, outChannel?: OutputChannel) {

const def = createDeferred<any>();

const launchDef = createDeferred<any>();

let outputChannelShown = false;

execPythonFile(pythonSettings.pythonPath, testArgs, rootDirectory, true, (data: string) => {

if (data.startsWith('READY' + os.EOL)) {

// debug socket server has started.

launchDef.resolve();

data = data.substring(('READY' + os.EOL).length);

}

if (!outputChannelShown) {

outputChannelShown = true;

outChannel.show();

}

outChannel.append(data);

}, token).catch(reason => {

if (!def.rejected && !def.resolved) {

def.reject(reason);

}

}).then(() => {

if (!def.rejected && !def.resolved) {

def.resolve();

}

}).catch(reason => {

if (!def.rejected && !def.resolved) {

def.reject(reason);

}

});

launchDef.promise.then(() => {

if (!Array.isArray(workspace.workspaceFolders) || workspace.workspaceFolders.length === 0) {

throw new Error('Please open a workspace');

}

let workspaceFolder = workspace.getWorkspaceFolder(Uri.file(rootDirectory));

if (!workspaceFolder) {

workspaceFolder = workspace.workspaceFolders[0];

}

return debug.startDebugging(workspaceFolder, {

"name": "Debug Unit Test",

"type": "python",

"request": "attach",

"localRoot": rootDirectory,

"remoteRoot": rootDirectory,

"port": pythonSettings.unitTest.debugPort,

"secret": "my_secret",

"host": "localhost"

});

}).catch(reason => {

if (!def.rejected && !def.resolved) {

def.reject(reason);

}

});

return def.promise;

}