03. P!rates js exam

function solve(args) {
  let sailInputLine = args.shift();

  const cities = {};

  while (sailInputLine !== 'Sail') {
    let [cityName, population, gold] = sailInputLine.split('||');
    population = Number(population);
    gold = Number(gold);
    if (!Object.prototype.hasOwnProperty.call(cities, cityName)) {
      cities[cityName] = { population, gold };
    } else {
      cities[cityName].population += population;
      cities[cityName].gold += gold;
    }

    sailInputLine = args.shift();
  }

  let eventInputLine = args.shift();

  while (eventInputLine !== 'End') {
    let [event, town, arg1, arg2] = eventInputLine.split('=>');
    arg1 = Number(arg1);
    arg2 = Number(arg2);

    switch (event) {
      case 'Plunder':
        console.log(`${town} plundered! ${arg2} gold stolen, ${arg1} citizens killed.`);
        cities[town].population -= arg1;
        cities[town].gold -= arg2;

        if (cities[town].population === 0 || cities[town].gold === 0) {
          delete cities[town];
          console.log(`${town} has been wiped off the map!`);
        }


        break;

      case 'Prosper':

        if (arg1 > 0) {
          cities[town].gold += arg1;
          console.log(`${arg1} gold added to the city treasury. ${town} now has ${cities[town].gold} gold.`);
        } else {
          console.log('Gold added cannot be a negative number!');
        }

        break;

      default:
        break;
    }
    eventInputLine = args.shift();
  }

  if (Object.keys(cities).length !== 0) {
    console.log(`Ahoy, Captain! There are ${Object.keys(cities).length} wealthy settlements to go to:`);

    Object.entries(cities)
      .sort((a, b) => b[1].gold - a[1].gold || a[0].localeCompare(b[0]))
      .forEach((city) => {
        const [name, props] = city;
        const { population, gold } = props;

        console.log(`${name} -> Population: ${population} citizens, Gold: ${gold} kg`);
      });
  } else {
    console.log('Ahoy, Captain! All targets have been plundered and destroyed!');
  }
}