export function prependCondaToPath(condaRoot: string, platform: Platform): void {
    if (platform === Platform.Windows) {
        // Windows: `python` lives in `condaRoot` and `conda` lives in `condaRoot\Scripts`
        tool.prependPath(condaRoot);
        tool.prependPath(path.join(condaRoot, 'Scripts'));
    } else {
        // Linux and macOS: `python` and `conda` both live in the `bin` directory
        tool.prependPath(path.join(condaRoot, 'bin'));
    }
}

 return this.getKubectl().then((kubectlpath)=> {
     this.kubectlPath = kubectlpath; 
     // prepend the tools path. instructs the agent to prepend for future tasks
     if(!process.env['PATH'].toLowerCase().startsWith(path.dirname(this.kubectlPath.toLowerCase()))) {
         toolLib.prependPath(path.dirname(this.kubectlPath));
     }     
 });

export async function useRubyVersion(parameters: TaskParameters, platform: Platform): Promise<void> {
    const toolName: string = 'Ruby';
    const installDir: string | null = tool.findLocalTool(toolName, parameters.versionSpec);
    if (!installDir) {
        // Fail and list available versions
        throw new Error([
            task.loc('VersionNotFound', parameters.versionSpec),
            task.loc('ListAvailableVersions'),
            tool.findLocalToolVersions('Ruby')
        ].join(os.EOL));
    }

    const toolPath: string = path.join(installDir, 'bin');
    if (platform !== Platform.Windows) {
        // replace the default
        const dest: string = '/usr/bin/ruby';
        if (fs.existsSync(dest)) {
            task.debug('removing ' + dest);
            fs.unlinkSync(dest);
        }
        fs.symlinkSync(path.join(toolPath, 'ruby'), dest);
    }

    task.setVariable('rubyLocation', toolPath);
    if (parameters.addToPath) {
        tool.prependPath(toolPath);
    }
}

export async function useRubyVersion(parameters: TaskParameters, platform: Platform): Promise<void> {
    const toolName: string = 'Ruby';
    const installDir: string | null = tool.findLocalTool(toolName, parameters.versionSpec);
    if (!installDir) {
        // Fail and list available versions
        throw new Error([
            task.loc('VersionNotFound', parameters.versionSpec),
            task.loc('ListAvailableVersions', task.getVariable('Agent.ToolsDirectory')),
            tool.findLocalToolVersions('Ruby'),
            task.loc('ToolNotFoundMicrosoftHosted', 'Ruby', 'https://aka.ms/hosted-agent-software'),
            task.loc('ToolNotFoundSelfHosted', 'Ruby', 'https://go.microsoft.com/fwlink/?linkid=2005989')
        ].join(os.EOL));
    }

    const toolPath: string = path.join(installDir, 'bin');
    if (platform !== Platform.Windows) {
        // Ruby / Gem heavily use the '#!/usr/bin/ruby' to find ruby, so this task needs to
        // replace that version of ruby so all the correct version of ruby gets selected
        // replace the default
        const dest: string = '/usr/bin/ruby';
        task.execSync('sudo', `ln -sf ${path.join(toolPath, 'ruby')} ${dest}`); // replace any existing
    }

    task.setVariable('rubyLocation', toolPath);
    if (parameters.addToPath) {
        tool.prependPath(toolPath);
    }
}

async function run() {
    let packageType = tl.getInput('packageType', true).toLowerCase();
    let versionSpec = tl.getInput('version', true);
    let installationPath = tl.getInput('installationPath', false);
    if (!installationPath) {
        installationPath = path.join(tl.getVariable('Agent.ToolsDirectory'), "dotnet");
    }
    let includePreviewVersions: boolean = tl.getBoolInput('includePreviewVersions', false) || false;

    console.log(tl.loc("ToolToInstall", packageType, versionSpec));
    var versionSpecParts = new VersionParts(versionSpec);

    let versionFetcher = new DotNetCoreVersionFetcher();
    let versionInfo: VersionInfo = await versionFetcher.getVersionInfo(versionSpecParts.versionSpec, packageType, includePreviewVersions);
    if (!versionInfo) {
        throw tl.loc("MatchingVersionNotFound", versionSpecParts.versionSpec);
    }

    let dotNetCoreInstaller = new VersionInstaller(packageType, installationPath);
    if (!dotNetCoreInstaller.isVersionInstalled(versionInfo.getVersion())) {
        await dotNetCoreInstaller.downloadAndInstall(versionInfo, versionFetcher.getDownloadUrl(versionInfo));
    }

    toolLib.prependPath(installationPath);

    // By default disable Multi Level Lookup unless user wants it enabled.
    let  performMultiLevelLookup = tl.getBoolInput("performMultiLevelLookup", false);
    tl.setVariable("DOTNET_MULTILEVEL_LOOKUP", !performMultiLevelLookup ? "0" : "1");

    // Add dot net tools path to "PATH" environment variables, so that tools can be used directly.
    addDotNetCoreToolPath();

    // Set DOTNET_ROOT for dotnet core Apphost to find runtime since it is installed to a non well-known location.
    tl.setVariable('DOTNET_ROOT', installationPath);
}

async function configureHelm() {
    var version = await helminstaller.getHelmVersion();
    var helmPath = await helminstaller.downloadHelm(version);

    // prepend the tools path. instructs the agent to prepend for future tasks
    if(!process.env['PATH'].startsWith(path.dirname(helmPath))) {
        toolLib.prependPath(path.dirname(helmPath));
    }  
}

async function configureKubectl() {
    var version = await kubectlinstaller.getKuberctlVersion();
    var kubectlPath = await kubectlinstaller.downloadKubectl(version);

    // prepend the tools path. instructs the agent to prepend for future tasks
    if(!process.env['PATH'].startsWith(path.dirname(kubectlPath))) {
        toolLib.prependPath(path.dirname(kubectlPath));
    }  
}

    public async install() {
        // Check cache
        let toolPath: string;
        let osSuffixes = this.detectMachineOS();
        let parts = osSuffixes[0].split("-");
        this.arch = parts.length > 1 ? parts[1] : "x64";
        toolPath = this.getLocalTool();

        if (!toolPath) {
            // download, extract, cache
            console.log(tl.loc("InstallingAfresh"));
            console.log(tl.loc("GettingDownloadUrl", this.packageType, this.version));
            let downloadUrls = await DotNetCoreReleaseFetcher.getDownloadUrls(osSuffixes, this.version, this.packageType);
            toolPath = await this.downloadAndInstall(downloadUrls);
        } else {
            console.log(tl.loc("UsingCachedTool", toolPath));
        }

        // Prepend the tools path. instructs the agent to prepend for future tasks
        toolLib.prependPath(toolPath);

        try {
            let globalToolPath: string = "";
            if (tl.osType().match(/^Win/)) {
                globalToolPath = path.join(process.env.USERPROFILE, ".dotnet\\tools");
            } else {
                globalToolPath = path.join(process.env.HOME, ".dotnet/tools");
            }

            console.log(tl.loc("PrependGlobalToolPath"));
            tl.mkdirP(globalToolPath);
            toolLib.prependPath(globalToolPath);
        } catch (error) {
            //nop
        }

        // Set DOTNET_ROOT for dotnet core Apphost to find runtime since it is installed to a non well-known location.
        tl.setVariable('DOTNET_ROOT', toolPath);
    }

export async function getNode(versionSpec: string, checkLatest: boolean) {
    if (toolLib.isExplicitVersion(versionSpec)) {
        checkLatest = false; // check latest doesn't make sense when explicit version
    }

    // check cache
    let toolPath: string;
    if (!checkLatest) {
        toolPath = toolLib.findLocalTool('node', versionSpec);
    }

    if (!toolPath) {
        let version: string;
        if (toolLib.isExplicitVersion(versionSpec)) {
            // version to download
            version = versionSpec;
        }
        else {
            // query nodejs.org for a matching version
            version = await queryLatestMatch(versionSpec);
            if (!version) {
                throw new Error(`Unable to find Node version '${versionSpec}' for platform ${osPlat} and architecture ${osArch}.`);
            }

            // check cache
            toolPath = toolLib.findLocalTool('node', version)
        }

        if (!toolPath) {
            // download, extract, cache
            toolPath = await acquireNode(version);
        }
    }

    //
    // a tool installer initimately knows details about the layout of that tool
    // for example, node binary is in the bin folder after the extract on Mac/Linux.
    // layouts could change by version, by platform etc... but that's the tool installers job
    //
    if (osPlat != 'win32') {
        toolPath = path.join(toolPath, 'bin');
    }

    //
    // prepend the tools path. instructs the agent to prepend for future tasks
    //
    toolLib.prependPath(toolPath);
}

function addDotNetCoreToolPath() {
    try {
        let globalToolPath: string = "";
        if (tl.osType().match(/^Win/)) {
            globalToolPath = path.join(process.env.USERPROFILE, Constants.relativeGlobalToolPath);
        } else {
            globalToolPath = path.join(process.env.HOME, Constants.relativeGlobalToolPath);
        }

        console.log(tl.loc("PrependGlobalToolPath"));
        tl.mkdirP(globalToolPath);
        toolLib.prependPath(globalToolPath);
    } catch (error) {
        //nop
        console.log(tl.loc("ErrorWhileSettingDotNetToolPath", JSON.stringify(error)));
    }
}