var grocery_array = [];

/*
 * This function will return a random number
 * param min : minimum limit of the range (inclusive)
 * param max: maximum limit of the range (inclusive).
 * returns : Random integer within specified limits.
 */
function randint(min, max) {
  return Math.floor(Math.random() * (max - min + 1)) + min;
}

function clear_input() {
  document.getElementById("new_item_input").value = "";
}

function addItemToList(item) {
  grocery_array.push(item);
  localStorage.setItem("grocery_list", JSON.stringify(grocery_array));

  let item_box = document.createElement("div");
  item_box.classList.add("grocery_item");

  let item_name_container = document.createElement("span");
  item_name_container.classList.add("grocery_item_name");

  item_name_container.textContent = item;

  let item_button = document.createElement("button");
  item_button.innerHTML = "<i class='bi bi-trash'></i>";
  item_button.onclick = (ev) => {
    let parent_div = ev.target.parentElement.closest("div");
    let item_name;
    var children = parent_div.childNodes;
    for (var i = 0; i < children.length; i++) {
      console.log(children[i]);
      if (children[i].tagName == "SPAN") {
        item_name = children[i].textContent;
        break;
      }
    }
    grocery_array = grocery_array.filter((value) => value != item_name);
    localStorage.setItem("grocery_list", JSON.stringify(grocery_array));
    parent_div.remove();
  };

  item_box.appendChild(item_button);
  item_box.appendChild(item_name_container);

  document.getElementById("grocery_list").appendChild(item_box);
}

function addNewItemToList() {
  let input = document.getElementById("new_item_input");
  if (input.value === "") return;
  let item = input.value;
  input.value = "";

  // quantity
  let quantity = document.getElementById("new_item_quantity").value;

  // unit
  let e = document.getElementById("new_item_unit");
  let text = e.options[e.selectedIndex].text;

  switch (text) {
    case "L":
      item =
        "" + quantity + (quantity == 1 ? " liter of " : " liters of ") + item;
      break;
    case "KG":
      item =
        "" +
        quantity +
        (quantity == 1 ? " kilogram of" : " kilograms of ") +
        item;
      break;
    default:
      item = "" + quantity + " " + item;
  }

  addItemToList(item);
}

function restoreList() {
  JSON.parse(localStorage.getItem("grocery_list")).forEach((element) => {
    addItemToList(element);
  });
}