import { emitKeypressEvents } from 'readline';

const handlers: Map<string, Function> = new Map();

export function on(keyName: string, callback: Function) {
  handlers.set(keyName, callback);
}

export function init() {
  emitKeypressEvents(process.stdin);
  (process.stdin as any).setRawMode(true);
  process.stdin.on('keypress', (letter, key) => {
    if (!key) return;

    if (key.ctrl && (key.name === 'c' || key.name === 'd')) {
      console.log('bye bye');
      process.exit();
    }

    for (const [keyName, callback] of handlers.entries()) {
      if (key.name === keyName) {
        callback();
      }
    }
  });
}