async function main(): Promise<void> {
	var feed = getProjectAndFeedIdFromInputParam("feed");
	if(feed.projectId) {
		throw new Error(tl.loc("UnsupportedProjectScopedFeeds"));
	}
	let feedId = feed.feedId;
	let regexGuid = /^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i;
	let packageId = tl.getInput("definition");

	if(!regexGuid.test(packageId)){
		packageId = "Nuget_" + tl.getInput("definition");
	}

	let version = tl.getInput("version");
	let downloadPath = tl.getInput("downloadPath");
	let collectionUrl = tl.getVariable("System.TeamFoundationCollectionUri");

	var accessToken = getAuthToken();
	var credentialHandler = vsts.getBearerHandler(accessToken);
	var vssConnection = new vsts.WebApi(collectionUrl, credentialHandler);
	var coreApi = vssConnection.getCoreApi();
	const retryLimitValue: string = tl.getVariable("VSTS_HTTP_RETRY");
	const retryLimit: number = (!!retryLimitValue && !isNaN(parseInt(retryLimitValue))) ? parseInt(retryLimitValue) : 4;
	tl.debug(`RetryLimit set to ${retryLimit}`);

	await executeWithRetries("downloadPackage", () => downloadPackage(collectionUrl, accessToken, credentialHandler, feedId, packageId, version, downloadPath).catch((reason) => {
		throw reason;
	}), retryLimit);
}

async function main(): Promise<void> {
    tl.setResourcePath(path.join(__dirname, 'task.json'));
    let packagingLocation: pkgLocationUtils.PackagingLocation;
    try {
        packagingLocation = await pkgLocationUtils.getPackagingUris(pkgLocationUtils.ProtocolType.Npm);
    } catch (error) {
        tl.debug('Unable to get packaging URIs, using default collection URI');
        tl.debug(JSON.stringify(error));
        const collectionUrl = tl.getVariable('System.TeamFoundationCollectionUri');
        packagingLocation = {
            PackagingUris: [collectionUrl],
            DefaultPackagingUri: collectionUrl
        };
    }
    const forcedUrl = tl.getVariable('Npm.PackagingCollectionUrl');
    if (forcedUrl) {
        packagingLocation.DefaultPackagingUri = forcedUrl;
        packagingLocation.PackagingUris.push(forcedUrl);
    }

    await _logNpmStartupVariables(packagingLocation);

    const command = tl.getInput(NpmTaskInput.Command);
    switch (command) {
        case NpmCommand.Install:
            return npmCustom.run(packagingLocation, NpmCommand.Install);
        case NpmCommand.Publish:
            return npmPublish.run(packagingLocation);
        case NpmCommand.Custom:
            return npmCustom.run(packagingLocation);
        default:
            tl.setResult(tl.TaskResult.Failed, tl.loc('UnknownCommand', command));
            return;
    }
}

function getDefaultProps() {
    return {
        releaseuri: tl.getVariable('Release.ReleaseUri'),
        releaseid: tl.getVariable('Release.ReleaseId'),
        builduri: tl.getVariable('Build.BuildUri'),
        buildid: tl.getVariable('Build.Buildid')
    };
}

export function getTempPath(): string {
    const tempNpmrcDir
        = tl.getVariable('Agent.BuildDirectory')
        || tl.getVariable('Agent.TempDirectory');
        const tempPath = path.join(tempNpmrcDir, 'npm');
    if (tl.exist(tempPath) === false) {
        tl.mkdirP(tempPath);
    }

    return tempPath;
}

function shouldUseVstsNuGetPush(isInternalFeed: boolean, conflictsAllowed: boolean, nugetExePath: string): boolean {
    if (tl.osType() !== "Windows_NT"){
        tl.debug("Running on a non-windows platform so NuGet.exe will be used.");
        return false;
    }

    if (!isInternalFeed)
    {
        tl.debug("Pushing to an external feed so NuGet.exe will be used.");
        return false;
    }

    if (commandHelper.isOnPremisesTfs())
    {
        tl.debug("Pushing to an onPrem environment, only NuGet.exe is supported.");
        if(conflictsAllowed){
            tl.warning(tl.loc("Warning_AllowDuplicatesOnlyAvailableHosted"));
        }
        return false;
    }

    const nugetOverrideFlag = tl.getVariable("NuGet.ForceNuGetForPush");
    if (nugetOverrideFlag === "true") {
        tl.debug("NuGet.exe is force enabled for publish.");
        if(conflictsAllowed)
        {
            tl.warning(tl.loc("Warning_ForceNuGetCannotSkipConflicts"));
        }
        return false;
    }

    if (nugetOverrideFlag === "false") {
        tl.debug("NuGet.exe is force disabled for publish.");
        return true;
    }

    const vstsNuGetPushOverrideFlag = tl.getVariable("NuGet.ForceVstsNuGetPushForPush");
    if (vstsNuGetPushOverrideFlag === "true") {
        tl.debug("VstsNuGetPush.exe is force enabled for publish.");
        return true;
    }

    if (vstsNuGetPushOverrideFlag === "false") {
        tl.debug("VstsNuGetPush.exe is force disabled for publish.");
        if(conflictsAllowed)
        {
            tl.warning(tl.loc("Warning_ForceNuGetCannotSkipConflicts"));
        }
        return false;
    }

    return true;
}

export function getPypircPath(): string {
    let pypircPath: string;
    if (tl.getVariable("PYPIRC_PATH")) {
        pypircPath = tl.getVariable("PYPIRC_PATH");
    }
    else {
       let tempPath = tl.getVariable("Agent.TempDirectory");
       tempPath = path.join(tempPath, "twineAuthenticate");
       tl.mkdirP(tempPath);
       let savePypircPath = fs.mkdtempSync(tempPath + path.sep);
       pypircPath = savePypircPath + path.sep + ".pypirc";
    }
    return pypircPath;
}

  public static setupIotedgedev(): void {
    try {
      let result = tl.execSync(`${Constants.iotedgedev}`, `--version`, Constants.execSyncSilentOption);
      if (result.code === 0) {
        console.log(tl.loc('DependencyAlreadyInstalled', Constants.iotedgedev, result.stdout.substring(result.stdout.indexOf("version"))));
        return;
      }
    } catch (e) {
      // If exception, it means iotedgedev is not installed. Do nothing.
    }

    let cmds: Cmd[] = [];
    let version = Constants.iotedgedevDefaultVersion;
    if (tl.getVariable(Constants.iotedgedevLockVersionKey)) {
      version = tl.getVariable(Constants.iotedgedevLockVersionKey);
    }
    tl.debug(`The specified iotedgedev version is: ${version}`);
    if (tl.osType() === Constants.osTypeLinux) {
      cmds = [
        { path: `sudo`, arg: `apt-get update`, execOption: Constants.execSyncSilentOption },
        { path: `sudo`, arg: `apt-get install -y python-setuptools`, execOption: Constants.execSyncSilentOption },
        { path: `sudo`, arg: `pip install ${Constants.iotedgedev}==${version}`, execOption: Constants.execSyncSilentOption },
      ]
    } else if (tl.osType() === Constants.osTypeWindows) {
      cmds = [
        { path: `pip`, arg: `install ${Constants.iotedgedev}==${version}`, execOption: Constants.execSyncSilentOption },
      ]
    }

    try {
      for (let cmd of cmds) {
        let result = tl.execSync(cmd.path, cmd.arg, cmd.execOption);
        if (result.code !== 0) {
          tl.debug(result.stderr);
        }
      }
    } catch (e) {
      // If exception, record error message to debug
      tl.debug(e);
    }

    let result = tl.execSync(`${Constants.iotedgedev}`, `--version`, Constants.execSyncSilentOption);
    if (result.code === 0) {
      console.log(tl.loc('DependencyInstallSuccess', Constants.iotedgedev, result.stdout.substring(result.stdout.indexOf("version"))));
    } else {
      throw Error(tl.loc('DependencyInstallFail', Constants.iotedgedev));
    }
  }

// For non LTS versions of Node, the files we need (for Windows) are sometimes located
// in a different folder than they normally are for other versions.
// Normally the format is similar to: https://nodejs.org/dist/v5.10.1/node-v5.10.1-win-x64.7z
// In this case, there will be two files located at:
//      /dist/v5.10.1/win-x64/node.exe
//      /dist/v5.10.1/win-x64/node.lib
// If this is not the structure, there may also be two files located at:
//      /dist/v0.12.18/node.exe
//      /dist/v0.12.18/node.lib
// This method attempts to download and cache the resources from these alternative locations.
// Note also that the files are normally zipped but in this case they are just an exe
// and lib file in a folder, not zipped.
async function acquireNodeFromFallbackLocation(version: string): Promise<string> {
    // Create temporary folder to download in to
    let tempDownloadFolder: string = 'temp_' + Math.floor(Math.random() * 2000000000);
    let tempDir: string = path.join(taskLib.getVariable('agent.tempDirectory'), tempDownloadFolder);
    taskLib.mkdirP(tempDir);
    let exeUrl: string;
    let libUrl: string;
    try {
        exeUrl = `https://nodejs.org/dist/v${version}/win-${os.arch()}/node.exe`;
        libUrl = `https://nodejs.org/dist/v${version}/win-${os.arch()}/node.lib`;

        await toolLib.downloadTool(exeUrl, path.join(tempDir, "node.exe"));
        await toolLib.downloadTool(libUrl, path.join(tempDir, "node.lib"));
    }
    catch (err) {
        if (err['httpStatusCode'] && 
            err['httpStatusCode'] === '404')
        {
            exeUrl = `https://nodejs.org/dist/v${version}/node.exe`;
            libUrl = `https://nodejs.org/dist/v${version}/node.lib`;

            await toolLib.downloadTool(exeUrl, path.join(tempDir, "node.exe"));
            await toolLib.downloadTool(libUrl, path.join(tempDir, "node.lib"));
        }
        else {
            throw err;
        }
    }
    return await toolLib.cacheDir(tempDir, 'node', version);
}

function isServerBasedRun(): boolean {
    const batchType = tl.getInput('distributionBatchType');
    if (batchType && batchType === 'basedOnTestCases') {
        const batchSize = tl.getInput('batchingBasedOnAgentsOption');
        if (batchSize && batchSize === 'customBatchSize') {
            return true;
        }
    } else if (batchType && batchType === 'basedOnExecutionTime') {
        return true;
    } else if (batchType && batchType === 'basedOnAssembly') {
        return true;
    }

    const testType = tl.getInput('testSelector');
    tl.debug('Value of Test Selector :' + testType);
    if (testType.toLowerCase() === 'testplan' || testType.toLowerCase() === 'testrun') {
        return true;
    }

    const parallelExecution = tl.getVariable('System.ParallelExecutionType');
    tl.debug('Value of ParallelExecutionType :' + parallelExecution);

    if (parallelExecution && parallelExecution.toLowerCase() === 'multimachine') {
        const dontDistribute = tl.getBoolInput('dontDistribute');
        if (dontDistribute) {
            return false;
        }
        return true;
    }

    return false;
}

async function acquireTfx(version: string): Promise<string> {
    try{
        version = toolLib.cleanVersion(version);
        
        let extPath: string;
        taskLib.assertAgent('2.115.0');
        extPath = taskLib.getVariable('Agent.TempDirectory');
        if (!extPath) {
            throw new Error('Expected Agent.TempDirectory to be set');
        }
        extPath = path.join(extPath, 'tfx'); // use as short a path as possible due to nested node_modules folders

        taskLib.mkdirP(path.join(extPath));
        const npmRunner = new tr.ToolRunner("npm");
        npmRunner.arg(["install", "tfx-cli@" + version, "--prefix", extPath]);

        const result = npmRunner.execSync({ failOnStdErr: false, silent: true, ignoreReturnCode: false} as tr.IExecOptions);
        if (result.code === 0)
        {
            if (os.platform() === "win32")
            {
                fs.unlinkSync(path.join(extPath, "/tfx"));
            }
            return await toolLib.cacheDir(extPath, 'tfx', version);
        }
    }
    catch {
        return Promise.reject(new Error("Failed to install tfx"));
    }
}