import * as fs from 'fs-extra';

import * as path from 'path';

import * as vscode from 'vscode';

import { IWorkspaceService } from '../common/application/types';

import { STANDARD_OUTPUT_CHANNEL } from '../common/constants';

import '../common/extensions';

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

import { IPythonToolExecutionService } from '../common/process/types';

import { IInstaller, IOutputChannel, Product } from '../common/types';

import { IServiceContainer } from '../ioc/types';

import { getTempFileWithDocumentContents, getTextEditsFromPatch } from './../common/editor';

import { IFormatterHelper } from './types';

export abstract class BaseFormatter {

protected readonly outputChannel: vscode.OutputChannel;

protected readonly workspace: IWorkspaceService;

private readonly helper: IFormatterHelper;

constructor(public Id: string, private product: Product, protected serviceContainer: IServiceContainer) {

this.outputChannel = serviceContainer.get<vscode.OutputChannel>(IOutputChannel, STANDARD_OUTPUT_CHANNEL);

this.helper = serviceContainer.get<IFormatterHelper>(IFormatterHelper);

this.workspace = serviceContainer.get<IWorkspaceService>(IWorkspaceService);

}

public abstract formatDocument(document: vscode.TextDocument, options: vscode.FormattingOptions, token: vscode.CancellationToken, range?: vscode.Range): Thenable<vscode.TextEdit[]>;

protected getDocumentPath(document: vscode.TextDocument, fallbackPath: string) {

if (path.basename(document.uri.fsPath) === document.uri.fsPath) {

return fallbackPath;

}

return path.dirname(document.fileName);

}

protected getWorkspaceUri(document: vscode.TextDocument) {

const workspaceFolder = this.workspace.getWorkspaceFolder(document.uri);

if (workspaceFolder) {

return workspaceFolder.uri;

}

const folders = this.workspace.workspaceFolders;

if (Array.isArray(folders) && folders.length > 0) {

return folders[0].uri;

}

return vscode.Uri.file(__dirname);

}

protected async provideDocumentFormattingEdits(document: vscode.TextDocument, options: vscode.FormattingOptions, token: vscode.CancellationToken, args: string[], cwd?: string): Promise<vscode.TextEdit[]> {

this.outputChannel.clear();

if (typeof cwd !== 'string' || cwd.length === 0) {

cwd = this.getWorkspaceUri(document).fsPath;

}

// autopep8 and yapf have the ability to read from the process input stream and return the formatted code out of the output stream.

// However they don't support returning the diff of the formatted text when reading data from the input stream.

// Yet getting text formatted that way avoids having to create a temporary file, however the diffing will have

// to be done here in node (extension), i.e. extension CPU, i.e. less responsive solution.

const tempFile = await this.createTempFile(document);

if (this.checkCancellation(document.fileName, tempFile, token)) {

return [];

}

const executionInfo = this.helper.getExecutionInfo(this.product, args, document.uri);

executionInfo.args.push(tempFile);

const pythonToolsExecutionService = this.serviceContainer.get<IPythonToolExecutionService>(IPythonToolExecutionService);

const promise = pythonToolsExecutionService.exec(executionInfo, { cwd, throwOnStdErr: true, token }, document.uri)

.then(output => output.stdout)

.then(data => {

if (this.checkCancellation(document.fileName, tempFile, token)) {

return [] as vscode.TextEdit[];

}

return getTextEditsFromPatch(document.getText(), data);

})

.catch(error => {

if (this.checkCancellation(document.fileName, tempFile, token)) {

return [] as vscode.TextEdit[];

}

// tslint:disable-next-line:no-empty

this.handleError(this.Id, error, document.uri).catch(() => { });

return [] as vscode.TextEdit[];

})

.then(edits => {

this.deleteTempFile(document.fileName, tempFile).ignoreErrors();

return edits;

});

vscode.window.setStatusBarMessage(`Formatting with ${this.Id}`, promise);

return promise;

}

protected async handleError(expectedFileName: string, error: Error, resource?: vscode.Uri) {

let customError = `Formatting with ${this.Id} failed.`;

if (isNotInstalledError(error)) {

const installer = this.serviceContainer.get<IInstaller>(IInstaller);

const isInstalled = await installer.isInstalled(this.product, resource);

if (!isInstalled) {

customError += `\nYou could either install the '${this.Id}' formatter, turn it off or use another formatter.`;

installer.promptToInstall(this.product, resource).catch(ex => console.error('Python Extension: promptToInstall', ex));

}

}

this.outputChannel.appendLine(`\n${customError}\n${error}`);

}

private async createTempFile(document: vscode.TextDocument): Promise<string> {

return document.isDirty

? getTempFileWithDocumentContents(document)

: document.fileName;

}

private deleteTempFile(originalFile: string, tempFile: string): Promise<void> {

if (originalFile !== tempFile) {

return fs.unlink(tempFile);

}

return Promise.resolve();

}

private checkCancellation(originalFile: string, tempFile: string, token?: vscode.CancellationToken): boolean {

if (token && token.isCancellationRequested) {

this.deleteTempFile(originalFile, tempFile).ignoreErrors();

return true;

}

return false;

}

}