06. System Components

function systemComponents(input) {
  const systems = new Map();

  const sortSystems = (s1, s2) => {
    if (systems.get(s1).size != systems.get(s2).size) {
      return systems.get(s2).size - systems.get(s1).size;
    }
    return s1.toLowerCase().localeCompare(s2.toLowerCase());
  };

  const sortComponents = (system, c1, c2) => systems.get(system).get(c2).length - systems.get(system).get(c1).length;


  input.forEach((line) => {
    const tokens = line.split(/\s*\|\s*/);

    const [system, component, subcomponent] = tokens;

    if (!systems.get(system)) {
      systems.set(system, new Map());
    }
    if (!systems.get(system).get(component)) {
      systems.get(system).set(component, []);
    }
    systems.get(system).get(component).push(subcomponent);
  });

  const systemsSorted = Array.from(systems.keys()).sort((s1, s2) => sortSystems(s1, s2));

  systemsSorted.forEach((system) => {
    console.log(system);
    const componentsSorted = Array.from(systems.get(system).keys()).sort((c1, c2) => sortComponents(system, c1, c2));

    componentsSorted.forEach((component) => {
      console.log(`|||${component}`);
      systems.get(system).get(component).forEach((sc) => console.log(`||||||${sc}`));
    });
  });
}