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

import * as vscode from 'vscode';
import * as path from 'path';
import * as fs from 'fs';
import * as os from 'os';
import * as cp from 'promisify-child-process';
import * as nls from 'vscode-nls';
import { isNullOrUndefined } from 'util';
import * as utils from '../common/utils';
const localize = nls.loadMessageBundle();

export const DBProjectConfigurationKey: string = 'sqlDatabaseProjects';
export const NetCoreInstallLocationKey: string = 'netCoreSDKLocation';
export const NextCoreNonWindowsDefaultPath = '/usr/local/share';
export const NetCoreInstallationConfirmation: string = localize('sqlDatabaseProjects.NetCoreInstallationConfirmation', "The .NET Core SDK cannnot be located. Project build will not work. Please install the same or update the .Net Core SDK location in settings if already installed.");
export const UpdateNetCoreLocation: string = localize('sqlDatabaseProjects.UpdateNetCoreLocation', "Update .Net Core location");
export const InstallNetCore: string = localize('sqlDatabaseProjects.InstallNetCore', "Install .Net Core SDK");

const projectsOutputChannel = localize('sqlDatabaseProjects.outputChannel', "Database Projects");
const dotnet = os.platform() === 'win32' ? 'dotnet.exe' : 'dotnet';

export interface DotNetCommandOptions {
	workingDirectory?: string;
	additionalEnvironmentVariables?: NodeJS.ProcessEnv;
	commandTitle?: string;
	argument?: string;
}

export class NetCoreTool {

	private _outputChannel: vscode.OutputChannel = vscode.window.createOutputChannel(projectsOutputChannel);

	public findOrInstallNetCore(): boolean {
		if (!this.isNetCoreInstallationPresent) {
			this.showInstallDialog();
			return false;
		}
		return true;
	}

	private showInstallDialog(): void {
		vscode.window.showInformationMessage(NetCoreInstallationConfirmation, UpdateNetCoreLocation, InstallNetCore).then(async (result) => {
			if (result === UpdateNetCoreLocation) {
				//open settings
				vscode.commands.executeCommand('workbench.action.openGlobalSettings');
			}
			else if (result === InstallNetCore) {
				//open install link
				const dotnetcoreURL = 'https://dotnet.microsoft.com/download/dotnet-core/3.1';
				vscode.env.openExternal(vscode.Uri.parse(dotnetcoreURL));
			}
		});
	}

	private get isNetCoreInstallationPresent(): Boolean {
		return (!isNullOrUndefined(this.netcoreInstallLocation) && fs.existsSync(this.netcoreInstallLocation));
	}

	public get netcoreInstallLocation(): string {
		return vscode.workspace.getConfiguration(DBProjectConfigurationKey)[NetCoreInstallLocationKey] ||
			this.defaultLocalInstallLocationByDistribution;
	}

	private get defaultLocalInstallLocationByDistribution(): string | undefined {
		const osPlatform: string = os.platform();
		return (osPlatform === 'win32') ? this.defaultWindowsLocation :
			(osPlatform === 'darwin' || osPlatform === 'linux') ? this.defaultnonWindowsLocation :
				undefined;
	}

	private get defaultnonWindowsLocation(): string | undefined {
		const defaultNonWindowsInstallLocation = NextCoreNonWindowsDefaultPath; //default folder for net core sdk
		return this.getDotnetPathIfPresent(defaultNonWindowsInstallLocation) ||
			this.getDotnetPathIfPresent(os.homedir()) ||
			undefined;
	}

	private get defaultWindowsLocation(): string | undefined {
		return this.getDotnetPathIfPresent(process.env['ProgramW6432']) ||
			this.getDotnetPathIfPresent(process.env['ProgramFiles(x86)']) ||
			this.getDotnetPathIfPresent(process.env['ProgramFiles']);
	}

	private getDotnetPathIfPresent(folderPath: string | undefined): string | undefined {
		if (!isNullOrUndefined(folderPath) && fs.existsSync(path.join(folderPath, 'dotnet'))) {
			return path.join(folderPath, 'dotnet');
		}
		return undefined;
	}

	public async runDotnetCommand(options: DotNetCommandOptions): Promise<string> {
		if (options && options.commandTitle !== undefined && options.commandTitle !== null) {
			this._outputChannel.appendLine(`\t[ ${options.commandTitle} ]`);
		}

		if (!this.findOrInstallNetCore()) {
			throw new Error(NetCoreInstallationConfirmation);
		}

		const dotnetPath = utils.getSafePath(path.join(this.netcoreInstallLocation, dotnet));
		const command = dotnetPath + ' ' + options.argument;

		try {
			return await this.runStreamedCommand(command, this._outputChannel, options);
		} catch (error) {
			this._outputChannel.append(localize('sqlDatabaseProject.RunCommand.ErroredOut', "\t>>> {0}   … errored out: {1}", command, utils.getErrorMessage(error))); //errors are localized in our code where emitted, other errors are pass through from external components that are not easily localized
			throw error;
		}
	}

	// spawns the dotnet command with arguments and redirects the error and output to ADS output channel
	public async runStreamedCommand(command: string, outputChannel: vscode.OutputChannel, options?: DotNetCommandOptions): Promise<string> {
		const stdoutData: string[] = [];
		outputChannel.appendLine(`    > ${command}`);

		const spawnOptions = {
			cwd: options && options.workingDirectory,
			env: Object.assign({}, process.env, options && options.additionalEnvironmentVariables),
			encoding: 'utf8',
			maxBuffer: 10 * 1024 * 1024, // 10 Mb of output can be captured.
			shell: true,
			detached: false,
			windowsHide: true
		};

		const child = cp.spawn(command, [], spawnOptions);
		outputChannel.show();

		// Add listeners to print stdout and stderr and exit code
		child.on('exit', (code: number | null, signal: string | null) => {
			if (code !== null) {
				outputChannel.appendLine(localize('sqlDatabaseProjects.RunStreamedCommand.ExitedWithCode', "    >>> {0}    … exited with code: {1}", command, code));
			} else {
				outputChannel.appendLine(localize('sqlDatabaseProjects.RunStreamedCommand.ExitedWithSignal', "    >>> {0}   … exited with signal: {1}", command, signal));
			}
		});

		child.stdout!.on('data', (data: string | Buffer) => {
			stdoutData.push(data.toString());
			this.outputDataChunk(data, outputChannel, localize('sqlDatabaseProjects.RunCommand.stdout', "    stdout: "));
		});

		child.stderr!.on('data', (data: string | Buffer) => {
			this.outputDataChunk(data, outputChannel, localize('sqlDatabaseProjects.RunCommand.stderr', "    stderr: "));
		});
		await child;

		return stdoutData.join('');
	}

	private outputDataChunk(data: string | Buffer, outputChannel: vscode.OutputChannel, header: string): void {
		data.toString().split(/\r?\n/)
			.forEach(line => {
				outputChannel.appendLine(header + line);
			});
	}
}