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// Copyright (c) Microsoft Corporation. All rights reserved.

// Licensed under the MIT License.

'use strict';

import * as fs from 'fs';

import * as path from 'path';

import { promisify } from 'util';

import { WorkspaceConfiguration } from 'vscode';

import './common/extensions';

import { traceError } from './common/logger';

import { EXTENSION_ROOT_DIR } from './constants';

type VSCode = typeof import('vscode');

// tslint:disable:no-require-imports

const setting = 'sourceMapsEnabled';

export class SourceMapSupport {

private readonly config: WorkspaceConfiguration;

constructor(private readonly vscode: VSCode) {

this.config = this.vscode.workspace.getConfiguration('python.diagnostics', null);

}

public async initialize(): Promise<void> {

if (!this.enabled) {

return;

}

await this.enableSourceMaps(true);

const localize = require('./common/utils/localize') as typeof import('./common/utils/localize');

const disable = localize.Diagnostics.disableSourceMaps();

this.vscode.window.showWarningMessage(localize.Diagnostics.warnSourceMaps(), disable).then(selection => {

if (selection === disable) {

this.disable().ignoreErrors();

}

});

}

public get enabled(): boolean {

return this.config.get<boolean>(setting, false);

}

public async disable(): Promise<void> {

if (this.enabled) {

await this.config.update(setting, false, this.vscode.ConfigurationTarget.Global);

}

await this.enableSourceMaps(false);

}

protected async enableSourceMaps(enable: boolean) {

const extensionSourceFile = path.join(EXTENSION_ROOT_DIR, 'out', 'client', 'extension.js');

const debuggerSourceFile = path.join(EXTENSION_ROOT_DIR, 'out', 'client', 'debugger', 'debugAdapter', 'main.js');

await Promise.all([this.enableSourceMap(enable, extensionSourceFile), this.enableSourceMap(enable, debuggerSourceFile)]);

}

protected async enableSourceMap(enable: boolean, sourceFile: string) {

const sourceMapFile = `${sourceFile}.map`;

const disabledSourceMapFile = `${sourceFile}.map.disabled`;

if (enable) {

await this.rename(disabledSourceMapFile, sourceMapFile);

} else {

await this.rename(sourceMapFile, disabledSourceMapFile);

}

}

protected async rename(sourceFile: string, targetFile: string) {

const fsExists = promisify(fs.exists);

const fsRename = promisify(fs.rename);

if (await fsExists(targetFile)) {

return;

}

await fsRename(sourceFile, targetFile);

}

}

export function initialize(vscode: VSCode = require('vscode')) {

if (!vscode.workspace.getConfiguration('python.diagnostics', null).get('sourceMapsEnabled', false)) {

new SourceMapSupport(vscode).disable().ignoreErrors();

return;

}

new SourceMapSupport(vscode).initialize().catch(_ex => {

traceError('Failed to initialize source map support in extension');

});

}