problem 2_1 - mid exam

function groceryStore(input) {
  let list = input.shift().split('|');

  let end = false;
  for (let i = 0; i < input.length; i++) {
    let splitCommand = input[i].split('%');
    let command = splitCommand.shift();
    let items = splitCommand;
    let item = items.shift();

    switch (command) {
      case "Important":
        if (list.includes(item)) {
          list.splice(list.indexOf(item), 1);
          list.unshift(item)
        } else {
          list.splice(0, 0, item)
        }
        break;
      case "Add":
        if (!list.includes(item)) {
          list.push(item);
        } else {
          console.log(`The product is already in the list.`)
        }
        break;
      case "Swap":
        let itemTwo = items.shift();
        let itemOneMissing = !list.includes(item);
        let itemTwoMissing = !list.includes(itemTwo);
        let itemOneIndex = list.indexOf(item);
        let itemTwoIndex = list.indexOf(itemTwo);
        if (list.includes(item) && list.includes(itemTwo)) {
          list.splice(itemOneIndex, 1, itemTwo);
          list.splice(itemTwoIndex, 1, item);
        } else {
          let missing = itemOneMissing ? item : itemTwo;
          console.log(`Product ${missing} missing!`)
        }
        break;
      case "Remove":
        if (list.includes(item)) {
          let itemIndex = list.indexOf(item);
          list.splice(itemIndex)
        } else {
          console.log(`Product ${item} isn't in the list.`)
        }
        break;
      case "Reversed":
        list.reverse()
        break;
      case "Shop!":
        end = true;
        break;
      default:
        break;
    }
    if(end) { break; }
  }

  list.map((item, index) => console.log(`${index + 1}. ${item}`))
}