/* --------------------------------------------------------------------------------------------
 * Copyright (c) Vu Nguyen. All rights reserved.
 * Licensed under the MIT License. See License.txt in the project root for license information.
 * ------------------------------------------------------------------------------------------ */

import * as path from 'path';
import { workspace, ExtensionContext } from 'vscode';

import {
  LanguageClient,
  LanguageClientOptions,
  ServerOptions,
  TransportKind,
} from 'vscode-languageclient/node';

let client: LanguageClient;

export function activate(context: ExtensionContext) {
  // The server is implemented in node
  const serverModule = context.asAbsolutePath(path.join('dist', 'server.js'));

  // The debug options for the server
  // --inspect=6009: runs the server in Node's Inspector mode so VS Code can attach to the server for debugging
  const debugOptions = { execArgv: ['--nolazy', '--inspect=6009'] };

  // If the extension is launched in debug mode then the debug server options are used
  // Otherwise the run options are used
  const serverOptions: ServerOptions = {
    run: { module: serverModule, transport: TransportKind.ipc },
    debug: {
      module: serverModule,
      transport: TransportKind.ipc,
      options: debugOptions,
    },
  };

	const settings = workspace.getConfiguration('cssVariables');
	const languages = settings.get('languages', [
		'astro',
		'svelte',
		'vue',
		'vue-html',
		'vue-postcss',
		'scss',
		'postcss',
		'less',
		'css',
		'html',
		'javascript',
		'javascriptreact',
		'typescript',
		'typescriptreact',
		'source.css.styled',
	]);

  // Options to control the language client
  const clientOptions: LanguageClientOptions = {
    documentSelector: languages.map((language) => ({
      scheme: 'file',
      language,
    })),
    synchronize: {
      fileEvents: [
        workspace.createFileSystemWatcher('**/*.css'),
        workspace.createFileSystemWatcher('**/*.scss'),
        workspace.createFileSystemWatcher('**/*.sass'),
        workspace.createFileSystemWatcher('**/*.less'),
      ],
    },
  };

  // Create the language client and start the client.
  client = new LanguageClient(
    'cssVariables',
    'CSS Variables Language Server',
    serverOptions,
    clientOptions
  );

  // Start the client. This will also launch the server
  client.start();
}

export function deactivate(): Thenable<void> | undefined {
  if (!client) {
    return undefined;
  }
  return client.stop();
}