script.js

let myLibrary = [];

window.addEventListener("load", function () {
  populateStorage();
  render();
});

function populateStorage() {
  if (myLibrary.length == 0) {
    const book1 = new Book("Robinson Crusoe", "Daniel Defoe", 252, true);
    const book2 = new Book(
      "The Old Man and the Sea",
      "Ernest Hemingway",
      127,
      true
    );
    myLibrary.push(book1);
    myLibrary.push(book2);
  }
}

const titleInput = document.getElementById("title");
const authorInput = document.getElementById("author");
const pagesInput = document.getElementById("pages");
const checkInput = document.getElementById("check");
const bookForm = document.getElementById("book-form");

bookForm.addEventListener("submit", submit);
//check the right input from forms and if its ok -> add the new book (object in array)
//via Book function and start render function
function submit(event) {
  event.preventDefault();
  if (
    titleInput.value.trim() === "" ||
    authorInput.value.trim() === "" ||
    pagesInput.value.trim() === ""
  ) {
    alert("Please fill all fields!");
    return false;
  } 
  
  const pageCount = Number(pagesInput.value);

  if (!Number.isInteger(pageCount) || pageCount < 1) {
    alert("Pages must be a positive whole number!");
    return false;
  }
    const book = new Book(titleInput.value.trim(), authorInput.value.trim(), pageCount, checkInput.checked);
    myLibrary.push(book);
    render();

    titleInput.value = "";
    authorInput.value = "";
    pagesInput.value = "";
    checkInput.checked = false;
  }


function Book(title, author, pages, isRead) {
  this.title = title;
  this.author = author;
  this.pages = pages;
  this.isRead = isRead;
}

function render() {
  const bookList = document.getElementById("book-list");

  bookList.innerHTML = "";
  
  //insert updated row and cells
  const length = myLibrary.length;

  for (let i = 0; i < length; i++) {
    const row = document.createElement("tr");
    bookList.appendChild(row);

    const titleCell = row.insertCell(0);
    const authorCell = row.insertCell(1);
    const pagesCell = row.insertCell(2);
    const wasReadCell = row.insertCell(3);
    const deleteCell = row.insertCell(4);

    titleCell.textContent = myLibrary[i].title;
    authorCell.textContent = myLibrary[i].author;
    pagesCell.textContent = myLibrary[i].pages;

    //add and wait for action for read/unread button
    const readButton = document.createElement("button");
    readButton.className = "btn btn-success";
    wasReadCell.appendChild(readButton);
    
    const readStatus = myLibrary[i].isRead ? "Yes" : "No";    
    readButton.textContent = readStatus;

    readButton.addEventListener("click", function () {
      myLibrary[i].isRead = !myLibrary[i].isRead;
      render();
    });


    //add delete button to every row and render again+
    const deleteButton = document.createElement("button");
    deleteCell.appendChild(deleteButton);
    deleteButton.className = "btn btn-warning";
    deleteButton.textContent = "Delete";
    deleteButton.addEventListener("click", function () {
      const deletedTitle = myLibrary[i].title;
      myLibrary.splice(i, 1);
      render();
      alert(`You've deleted title: ${deletedTitle}`);
    });
  }
}