09. Gladiator Inventory

function manipulateGladiatorInventory(arr) {
  let initialInventory = arr.shift().split(" ");

  for (let currentCommand of arr) {
    let [command, item] = currentCommand.split(" ");

    switch (command) {
      case "Buy":
        if (!initialInventory.includes(item)) {
          initialInventory.push(item);
        }

        break;

      case "Trash":
        if (initialInventory.includes(item)) {
          let itemIndex = initialInventory.indexOf(item);
          initialInventory.splice(itemIndex, 1);
        }
        break;

      case "Repair":
        if (initialInventory.includes(item)) {
          let itemIndex = initialInventory.indexOf(item);
          initialInventory.splice(itemIndex, 1);
          initialInventory.push(item);
        }
        break;

      case "Upgrade":
        if (item.includes("-")) {
          let [equipment, upgrade] = item.split("-");
          let upgradeAsString = `${equipment}:${upgrade}`;

          if (initialInventory.includes(equipment)) {
            let equipmentIndex = initialInventory.indexOf(equipment);
            initialInventory.splice(equipmentIndex + 1, 0, upgradeAsString);
          }
        }

        break;
    }
  }
  return initialInventory.join(" ");
}