import * as path from 'path';
import { 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('out', 'server.js'));

    // Server options - run the server in Node
    const serverOptions: ServerOptions = {
        run: { module: serverModule, transport: TransportKind.ipc },
        debug: {
            module: serverModule,
            transport: TransportKind.ipc,
            options: { execArgv: ['--nolazy', '--inspect=6009'] }
        }
    };

    // Options to control the language client
    const clientOptions: LanguageClientOptions = {
        // Register the server for EFTL documents
        documentSelector: [{ scheme: 'file', language: 'eftl' }]
    };

    // Create the language client and start the client
    client = new LanguageClient(
        'eftlLanguageServer',
        'EFTL 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();
}