import { JSONRPCMessage } from '../../src/types.js';
import { ReadBuffer } from '../../src/shared/stdio.js';

const testMessage: JSONRPCMessage = {
    jsonrpc: '2.0',
    method: 'foobar'
};

test('should have no messages after initialization', () => {
    const readBuffer = new ReadBuffer();
    expect(readBuffer.readMessage()).toBeNull();
});

test('should only yield a message after a newline', () => {
    const readBuffer = new ReadBuffer();

    readBuffer.append(Buffer.from(JSON.stringify(testMessage)));
    expect(readBuffer.readMessage()).toBeNull();

    readBuffer.append(Buffer.from('\n'));
    expect(readBuffer.readMessage()).toEqual(testMessage);
    expect(readBuffer.readMessage()).toBeNull();
});

test('should be reusable after clearing', () => {
    const readBuffer = new ReadBuffer();

    readBuffer.append(Buffer.from('foobar'));
    readBuffer.clear();
    expect(readBuffer.readMessage()).toBeNull();

    readBuffer.append(Buffer.from(JSON.stringify(testMessage)));
    readBuffer.append(Buffer.from('\n'));
    expect(readBuffer.readMessage()).toEqual(testMessage);
});