'use strict';

import * as vscode from 'vscode';

import * as path from 'path';

import * as fs from 'fs';

import {sendCommand} from './../common/childProc';

import * as settings from './../common/configSettings';

export abstract class BaseFormatter {

public Id: string;

protected outputChannel: vscode.OutputChannel;

protected pythonSettings: settings.IPythonSettings;

constructor(id: string, outputChannel: vscode.OutputChannel) {

this.Id = id;

this.outputChannel = outputChannel;

this.pythonSettings = settings.PythonSettings.getInstance();

}

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

protected provideDocumentFormattingEdits(document: vscode.TextDocument, options: vscode.FormattingOptions, token: vscode.CancellationToken, cmdLine: string): Thenable<vscode.TextEdit[]> {

var fileDir = path.dirname(document.uri.fsPath);

return new Promise<vscode.TextEdit[]>((resolve, reject) => {

//Todo: Save the contents of the file to a temporary file and format that instead saving the actual file

//This could unnecessarily trigger other behaviours

document.save().then(saved=> {

var filePath = document.uri.fsPath;

if (!fs.existsSync(filePath)) {

vscode.window.showErrorMessage(`File ${filePath} does not exist`)

return resolve([]);

}

this.outputChannel.clear();

sendCommand(cmdLine, fileDir).then(data=> {

var formattedText = data;

if (document.getText() === formattedText) {

return resolve([]);

}

var range = new vscode.Range(document.lineAt(0).range.start, document.lineAt(document.lineCount - 1).range.end)

var txtEdit = new vscode.TextEdit(range, formattedText);

resolve([txtEdit]);

}).catch(errorMsg => {

vscode.window.showErrorMessage(`There was an error in formatting the document. View the Python output window for details.`);

this.outputChannel.appendLine(errorMsg);

return resolve([]);

});

});

});

}

}