import {Power3, TweenMax} from 'gsap/TweenMax';
import {formatMoney} from '@shopify/theme-currency/currency';
import 'whatwg-fetch';
import serialize from 'form-serialize';

export default class AjaxCart {

  constructor() {

    this.defaults = {
      cartModal: '.js-ajax-cart-modal',
      cartModalClose: '.js-ajax-cart-modal-close',
      cartDrawer: '.js-ajax-cart-drawer',
      cartDrawerContent: '.js-ajax-cart-drawer-content',
      cartDrawerClose: '.js-ajax-cart-drawer-close',
      cartDrawerTrigger: '.js-ajax-cart-drawer-trigger',
      cartOverlay: '.js-ajax-cart-overlay',
      cartCounter: '.js-ajax-cart-counter',
      addToCart: '.js-ajax-add-to-cart',
      removeFromCart: '.js-ajax-remove-from-cart',
      removeFromCartNoDot: 'js-ajax-remove-from-cart',
      checkoutButton: '.js-ajax-checkout-button',
      bodyClass: 'is-overlay-opened',
    };

    this.cartModal = document.querySelector(this.defaults.cartModal);
    this.cartModalClose = document.querySelector(this.defaults.cartModalClose);
    this.cartDrawer = document.querySelector(this.defaults.cartDrawer);
    this.cartDrawerContent = document.querySelector(this.defaults.cartDrawerContent);
    this.cartDrawerClose = document.querySelector(this.defaults.cartDrawerClose);
    this.cartDrawerTrigger = document.querySelector(this.defaults.cartDrawerTrigger);
    this.cartOverlay = document.querySelector(this.defaults.cartOverlay);
    this.cartCounter = document.querySelector(this.defaults.cartCounter);
    this.addToCart = document.querySelectorAll(this.defaults.addToCart);
    this.checkoutButton = document.querySelector(this.defaults.checkoutButton);
    this.htmlSelector = document.documentElement;

    this.fetchCart();

    this.addToCart.forEach((item) => {
      item.addEventListener('click', (event) => {
        event.preventDefault();
        const formID = item.parentNode.getAttribute('id');
        this.addProductToCart(formID);
      });
    });

    this.cartOverlay.addEventListener('click', () => {
      this.closeFailModal();
      this.closeCartDrawer();
      this.closeCartOverlay();
    });

    this.cartDrawerClose.addEventListener('click', () => {
      this.closeCartDrawer();
      this.closeCartOverlay();
    });

    this.cartDrawerTrigger.addEventListener('click', (event) => {
      event.preventDefault();
      this.openCartDrawer();
      this.openCartOverlay();
    });

    this.cartModalClose.addEventListener('click', () => {
      this.closeFailModal();
      this.closeCartDrawer();
      this.closeCartOverlay();
    });

  }

  fetchCart(callback) {
    window.fetch('/cart.js', {
      credentials: 'same-origin',
      method: 'GET',
    })
      .then((resp) => resp.json())
      .then((cart) => {
        this.currentCartItemNumber(cart);
        if (cart.item_count === 0) {
          this.renderBlankCart();
          this.checkoutButton.classList.add('is-hidden');
        } else {
          this.renderCart(cart);
          this.checkoutButton.classList.remove('is-hidden');
          if ((typeof callback) === 'function') {
            callback(cart);
          }
        }
      })
      .catch((error) => {
        this.ajaxRequestFail();
        throw new Error(error);
      });
  }

  addProductToCart(formID, callback) {
    const form = document.querySelector(`#${formID}`);
    const formData = serialize(form, {hash: true});
    window.fetch('/cart/add.js', {
      method: 'POST',
      credentials: 'include',
      headers: {
        'Content-Type': 'application/json',
      },
      body: JSON.stringify(formData),
    })
      .then((resp) => resp.json())
      .then((cart) => {
        if ((typeof callback) === 'function') {
          callback(cart);
        } else {
          this.addToCartOk();
        }
      })
      .catch((error) => {
        this.ajaxRequestFail();
        throw new Error(error);
      });
  }

  changeItem(line, callback) {
    const quantity = 0;
    window.fetch('/cart/change.js', {
      method: 'POST',
      credentials: 'same-origin',
      body: JSON.stringify({line, quantity}),
      headers: {
        'Content-Type': 'application/json',
      },
    })
      .then((resp) => resp.json())
      .then((cart) => {
        if ((typeof callback) === 'function') {
          callback(cart);
        } else {
          this.fetchCart();
        }
      })
      .catch((error) => {
        this.ajaxRequestFail();
        throw new Error(error);
      });
  }

  currentCartItemNumber(cart) {
    this.cartCounter.innerHTML = cart.item_count;
  }

  addToCartOk() {
    this.fetchAndOpenCart();
  }

  fetchAndOpenCart() {
    this.fetchCart(() => {
      this.openCartDrawer();
      this.openCartOverlay();
    });
  }

  ajaxRequestFail() {
    this.openFailModal();
    this.openCartOverlay();
  }

  renderCart(cart) {
    this.clearCartDrawer();
    cart.items.forEach((item, index) => {
      const cartSingleProduct = `
        <div class="ajax-cart-item__single" data-line="${Number(index + 1)}">
            <div class="ajax-cart-item__info-wrapper">
                <div class="ajax-cart-item__image" style="background-image: url(${item.image});"></div>
                <div class="ajax-cart-item__info">
                    <a href="${item.url}" class="ajax-cart-item__title">${item.product_title}</a>
                    <div class="ajax-cart-item__variant">${item.variant_title}</div>
                    <div class="ajax-cart-item__quantity">Quantity: ${item.quantity}</div>
                </div>
            </div>
            <div class="ajax-cart-item__price">${formatMoney(item.line_price)}</div>
            <a class="ajax-cart-item__remove ${this.defaults.removeFromCartNoDot}">Remove</a>
        </div>
      `;
      this.cartDrawerContent.innerHTML += cartSingleProduct;
    });
    const cartSubTotal = `
        <div class="ajax-cart-drawer__subtotal">
            <span>Subtotal: </span>
            <span class="ajax-cart-drawer__subtotal-price">${formatMoney(cart.total_price)}</span>
        </div>
    `;
    this.cartDrawerContent.innerHTML += cartSubTotal;
    const removeFromCart = document.querySelectorAll(this.defaults.removeFromCart);
    removeFromCart.forEach((item) => {
      item.addEventListener('click', () => {
        const line = item.parentNode.getAttribute('data-line');
        this.changeItem(line);
      });
    });
  }

  renderBlankCart() {
    this.clearCartDrawer();
    this.cartDrawerContent.innerHTML = '<div class="ajax-cart__empty">Your Cart is currenty empty!</div>';
  }

  openCartDrawer() {
    TweenMax.to(this.cartDrawer, 0.5, {
      x: -480,
      ease: Power3.easeInOut,
    });
  }

  closeCartDrawer() {
    TweenMax.to(this.cartDrawer, 0.5, {
      x: 0,
      ease: Power3.easeInOut,
    });
  }

  clearCartDrawer() {
    this.cartDrawerContent.innerHTML = '';
  }

  openFailModal() {
    TweenMax.to(this.cartModal, 0.4, {
      autoAlpha: 1,
      ease: Power3.easeOut,
    });
  }

  closeFailModal() {
    TweenMax.to(this.cartModal, 0.2, {
      autoAlpha: 0,
      ease: Power3.easeOut,
    });
  }

  openCartOverlay() {
    this.htmlSelector.classList.add(this.defaults.bodyClass);
    TweenMax.to(this.cartOverlay, 0.5, {
      autoAlpha: 1,
      ease: Power3.easeInOut,
    });
  }

  closeCartOverlay() {
    this.htmlSelector.classList.remove(this.defaults.bodyClass);
    TweenMax.to(this.cartOverlay, 0.5, {
      autoAlpha: 0,
      ease: Power3.easeInOut,
    });
  }

}

// tipovi ajax carta (mini cart, lijevi i desni drawer, popup, quantity change in cart)