script.js

'use strict';

///////////////////////////////////////
// Modal window
const btnScrollTo = document.querySelector('.btn--scroll-to');
const section1 = document.querySelector('#section--1');
const modal = document.querySelector('.modal');
const overlay = document.querySelector('.overlay');
const btnCloseModal = document.querySelector('.btn--close-modal');
const btnsOpenModal = document.querySelectorAll('.btn--show-modal');
const nav = document.querySelector('.nav');
const tabs = document.querySelectorAll('.operations__tab');
const tabsContainer = document.querySelector('.operations__tab-container');
const tabsContent = document.querySelectorAll('.operations__content');

const openModal = function (e) {
  e.preventDefault();
  modal.classList.remove('hidden');
  overlay.classList.remove('hidden');
};

const closeModal = function () {
  modal.classList.add('hidden');
  overlay.classList.add('hidden');
};

btnsOpenModal.forEach(btn => btn.addEventListener('click', openModal));

// for (let i = 0; i < btnsOpenModal.length; i++)
//   btnsOpenModal[i].addEventListener('click', openModal);

btnCloseModal.addEventListener('click', closeModal);
overlay.addEventListener('click', closeModal);

document.addEventListener('keydown', function (e) {
  if (e.key === 'Escape' && !modal.classList.contains('hidden')) {
    closeModal();
  }
});

///////////////////////////////
// Button scrolling
btnScrollTo.addEventListener('click', function (e) {
  // const s1coords = section1.getBoundingClientRect();
  // console.log(s1coords);

  // console.log(e.target.getBoundingClientRect());

  // console.log('Current scroll (X/Y)', window.pageXOffset, window.pageYOffset);

  // console.log(
  //   'height/width viewport',
  //   document.documentElement.clientHeight,
  //   document.documentElement.clientWidth
  // );

  // Scrolling
  // window.scrollTo(
  //   s1coords.left + window.pageXOffset,
  //   s1coords.top + window.pageYOffset
  // );

  // window.scrollTo({
  //   left: s1coords.left + window.pageXOffset,
  //   top: s1coords.top + window.pageYOffset,
  //   behavior: 'smooth',
  // });

  section1.scrollIntoView({ behavior: 'smooth' });
});

/////////////////////////////////////////////////
// Page Navigation

// document.querySelectorAll('.nav__link').forEach(function (el) {
//   el.addEventListener('click', function (e) {
//     e.preventDefault();
//     const id = this.getAttribute('href');
//     console.log(id);
//     document.querySelector(id).scrollIntoView({ behavior: 'smooth' });
//   });
// });

// EVENT DELEGATION!
// 1. Add event Listener to common parent element
// 2. Determine what element originated the event

document.querySelector('.nav__links').addEventListener('click', function (e) {
  e.preventDefault();

  // Matching Strategy
  if (e.target.classList.contains('nav__link')) {
    const id = e.target.getAttribute('href');
    console.log(id);
    document.querySelector(id).scrollIntoView({ behavior: 'smooth' });
  }
});

// BUILDING A TABBED COMPONENT
tabsContainer.addEventListener('click', function (e) {
  const clicked = e.target.closest('.operations__tab');

  // Guard clause
  if (!clicked) return;

  // Remove active classes
  tabs.forEach(t => t.classList.remove('operations__tab--active'));
  tabsContent.forEach(c => c.classList.remove('operations__content--active'));

  // Active tab
  clicked.classList.add('operations__tab--active');

  // Activate content area
  document
    .querySelector(`.operations__content--${clicked.dataset.tab}`)
    .classList.add('operations__content--active');
});

// Menu fade animation
const handleHover = function (e) {
  if (e.target.classList.contains('nav__link')) {
    const link = e.target;
    const siblings = link.closest('.nav').querySelectorAll('.nav__link');
    const logo = link.closest('.nav').querySelector('img');

    siblings.forEach(el => {
      if (el !== link) el.style.opacity = this;
    });
    logo.style.opacity = this;
  }
};

nav.addEventListener('mouseover', handleHover.bind(0.5));

nav.addEventListener('mouseout', handleHover.bind(1));

// // STICKY NAVIGATION
// const initialCoords = section1.getBoundingClientRect();
// // console.log(initialCoords);

// window.addEventListener('scroll', function () {
//   // console.log(window.scrollY);

//   if (window.scrollY > initialCoords.top) nav.classList.add('sticky');
//   else nav.classList.remove('sticky');
// });

// Sticky navigation: Intersection Observer API

// const obsCallback = function (entries, observer) {
//   entries.forEach(entry => {
//     console.log(entry);
//   });
// };

// const obsOptions = {
//   root: null,
//   threshold: [0, 0.2],
// };

// const observer = new IntersectionObserver(obsCallback, obsOptions);
// observer.observe(section1);

const header = document.querySelector('.header');
const navHeight = nav.getBoundingClientRect().height;

const stickyNav = function (entries) {
  const [entry] = entries;
  // console.log(entry);

  if (!entry.isIntersecting) nav.classList.add('sticky');
  else nav.classList.remove('sticky');
};

const headerObserver = new IntersectionObserver(stickyNav, {
  root: null,
  threshold: 0,
  rootMargin: `-${navHeight}px`,
});
headerObserver.observe(header);

// Reveal Sections
const allSections = document.querySelectorAll('.section');

const revealSection = function (entries, observer) {
  const [entry] = entries;

  if (!entry.isIntersecting) return;

  entry.target.classList.remove('section--hidden');
  observer.unobserve(entry.target);
};

const sectionObserver = new IntersectionObserver(revealSection, {
  root: null,
  threshold: 0.15, // 15%
});

allSections.forEach(function (section) {
  sectionObserver.observe(section);
  section.classList.add('section--hidden');
});

// Lazy Loading Images
const imgTarget = document.querySelectorAll('img[data-src]');

const loadImg = function (entries, observer) {
  const [entry] = entries;

  if (!entry.isIntersecting) return;

  // Replace src with data-src
  entry.target.src = entry.target.dataset.src;

  entry.target.addEventListener('load', function () {
    entry.target.classList.remove('lazy-img');
  });

  observer.unobserve(entry.target);
};

const imgObserver = new IntersectionObserver(loadImg, {
  root: null,
  threshold: 0,
  rootMargin: '200px',
});

imgTarget.forEach(img => imgObserver.observe(img));

// Slider
const slider = function () {
  const slides = document.querySelectorAll('.slide');
  const btnLeft = document.querySelector('.slider__btn--left');
  const btnRight = document.querySelector('.slider__btn--right');
  const dotContainer = document.querySelector('.dots');

  let curSlide = 0;
  const maxSlide = slides.length;

  // Functions
  const createDots = function () {
    slides.forEach(function (_, i) {
      dotContainer.insertAdjacentHTML(
        'beforeend',
        `<button class="dots__dot" data-slide="${i}"></button>`
      );
    });
  };

  const activateDot = function (slide) {
    document
      .querySelectorAll('.dots__dot')
      .forEach(dot => dot.classList.remove('dots__dot--active'));

    document
      .querySelector(`.dots__dot[data-slide="${slide}"]`)
      .classList.add('dots__dot--active');
  };

  const goToSlide = function (slide) {
    slides.forEach(
      (s, i) => (s.style.transform = `translateX(${100 * (i - slide)}%)`)
    );
  };

  // Next slide
  const nextSlide = function () {
    if (curSlide === maxSlide - 1) {
      curSlide = 0;
    } else {
      curSlide++;
    }

    goToSlide(curSlide);
    activateDot(curSlide);
  };

  const prevSlide = function () {
    if (curSlide === 0) {
      curSlide = maxSlide - 1;
    } else {
      curSlide--;
    }
    goToSlide(curSlide);
    activateDot(curSlide);
  };

  const init = function () {
    goToSlide(0);
    createDots();

    activateDot(0);
  };
  init();

  // Event handlers
  btnRight.addEventListener('click', nextSlide);
  btnLeft.addEventListener('click', prevSlide);

  document.addEventListener('keydown', function (e) {
    if (e.key === 'ArrowLeft') prevSlide();
    e.key === 'ArrowRight' && nextSlide();
  });

  dotContainer.addEventListener('click', function (e) {
    if (e.target.classList.contains('dots__dot')) {
      const { slide } = e.target.dataset;
      goToSlide(slide);
      activateDot(slide);
    }
  });
};
slider();

/////////////////////////////////////////////////
/////////////////////////////////////////////////
/*
const header = document.querySelector('.header');
const allSections = document.querySelectorAll('.section');
console.log(allSections);

document.getElementById('section--1');
const allButtons = document.getElementsByTagName('button');
console.log(allButtons);

console.log(document.getElementsByClassName('btn'));

// Creating and inserting elements
const message = document.createElement('div');
message.classList.add('cookie-message');
// message.textContent = 'We used cookie for improved functionality and analytics.';
message.innerHTML = `We used cookie for improved functionality and analytics. <button class='btn btn--close-cookie'>Got it!</button>`;

// header.prepend(message); // Prepend is last child
header.append(message); // Append is first child
// If you want the same element to be twice at the same place you need to copy it then!
// header.append(message.cloneNode(true));

// header.before(message);
// header.after(message);

// Delete element
document
  .querySelector('.btn--close-cookie')
  .addEventListener('click', function () {
    message.remove();
  });
  

/*
// Styles
message.style.backgroundColor = '#37383d';
message.style.width = '120%';

console.log(message.style.color);
console.log(message.style.backgroundColor);

console.log(getComputedStyle(message).color);
console.log(getComputedStyle(message).height);

message.style.height =
  Number.parseFloat(getComputedStyle(message).height, 10) + 30 + 'px';

// console.log(message.style.height);

// documentelement means root over here
document.documentElement.style.setProperty('--color-primary', 'orangered');

// Attributes
const logo = document.querySelector('.nav__logo');
// Only standard attributes will work
console.log(logo.alt);
console.log(logo.className);

// This way you can set the property too!
// logo.alt = 'Beautiful logo';
// console.log(logo.alt);

// Non-standard won't work
console.log(logo.designer);
// But this is how non-standard will work!
console.log(logo.getAttribute('designer'));
// This way you can create attribute
logo.setAttribute('company', 'Bankist');
// console.log(logo.getAttribute('company'));

console.log(logo.src);
console.log(logo.getAttribute('src'));

const link = document.querySelector('.twitter-link');
console.log(link.href);
console.log(link.getAttribute('href'));

const link2 = document.querySelector('.nav__link--btn');
console.log(link2.href);
console.log(link2.getAttribute('href'));

// Data attributes
console.log(logo.dataset.versionNumber);

// Classes
// logo.classList.add('');
// logo.classList.remove('');
// logo.classList.toggle('');
// logo.classList.contains(''); // not includes

// Don't use
// logo.className = 'jonas';
  */

// Implementing Smooth Scroll---------------.
// const btnScrollTo = document.querySelector('.btn--scroll-to');
// const section1 = document.querySelector('#section--1');

// btnScrollTo.addEventListener('click', function (e) {
//   section1.scrollIntoView({ behavior: 'smooth' });
// });

///////////////////////////////
// TYPES OF EVENTS AND EVENT HANDLERS
/*
const h1 = document.querySelector('h1');

const alertH1 = function (e) {
  alert(`addEventListener: Great! You are reading the heading :) `);

  // h1.removeEventListener('mouseenter', alertH1);
  // You can line the above code anywhere
};

h1.addEventListener('mouseenter', alertH1);

setTimeout(
  () => h1.removeEventListener('mouseenter', alertH1),

  3000
); */

// CAPTURING AND BUBBLING PHASE!
// rgb(255,255,255)
/*
const randomInt = (min, max) =>
  Math.floor(Math.random() * (max - min + 1) + min);

const randomColor = () =>
  `rgb(${randomInt(0, 255)}, ${randomInt(0, 255)}, ${randomInt(0, 255)})`;

document.querySelector('.nav__link').addEventListener('click', function (e) {
  this.style.backgroundColor = randomColor();
  console.log('LINK', e.target, e.currentTarget);
  // console.log(e.currentTarget === this);
});

document.querySelector('.nav__links').addEventListener('click', function (e) {
  this.style.backgroundColor = randomColor();
  console.log('CONTAINER', e.target, e.currentTarget);
});

document.querySelector('.nav').addEventListener('click', function (e) {
  this.style.backgroundColor = randomColor();
  console.log('NAV', e.target, e.currentTarget);
}); */

///////////////////////////////////
// DOM TRAVERSING
/*
const h1 = document.querySelector('h1');

// Going downwards
console.log(h1.querySelectorAll('.highlight'));
console.log(h1.childNodes);
console.log(h1.children);

h1.firstElementChild.style.color = 'white';
h1.lastElementChild.style.color = 'orangered';

// Going upwards: parents
console.log(h1.parentNode);
console.log(h1.parentElement);

h1.closest('.header').style.background = 'var(--gradient-secondary)';

h1.closest('h1').style.background = 'var(--gradient-primary)';

// Going sideways siblings
console.log(h1.previousElementSibling);
console.log(h1.nextElementSibling);

console.log(h1.previousSibling);
console.log(h1.nextSibling);

console.log(h1.parentElement.children);
[...h1.parentElement.children].forEach(function (el) {
  if (el !== h1) el.style.transform = 'scale(0.5)';
}); */

/////////////////////////////////////////
// LIFE-CYCLE DOM EVENTS

document.addEventListener('DOMContentLoaded', function (e) {
  console.log('HTML Parsed');
});

window.addEventListener('load', function (e) {
  console.log('FULLY LOADED');
});

// window.addEventListener('beforeunload', function (e) {
//   e.preventDefault();
//   console.log(e);
//   e.returnValue = true;
// });

// DEFER AND ASYNC