JS метод добавления в корзину

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class UserCart {
    _key = 'userCart'
    _text = {
        add: 'Добавить в корзину',
        remove: 'Удалить из корзины'
    }
    _linkCreateOrder = '/orders/create'

    constructor() {
        if (window.location.pathname !== this._linkCreateOrder) {
            this.cart = this.getCartLS()
            this._init()
        }
    }

    _init = () => {
        document.querySelectorAll('.products-card__add-to-cart').forEach((button) => {
            const productId = button.closest('[data-productid]').dataset.productid
            if (this.cart.includes(productId)) button.innerText = this._text.remove
            button.addEventListener('click', () => this._onClick(button, productId))
        })
        this._toggleShowFloatingBasket()
    }

    _onClick = (button, productId) => {
        const action = this.toggleProduct(productId)
        button.innerText = (action === 'added') ? this._text.remove : this._text.add
    }

    getCartLS = () => {
        const userCartLS = JSON.parse(localStorage.getItem(this._key))
        return userCartLS ?? []
    }

    resetCart = () => {
        this.cart = []
        localStorage.removeItem(this._key)
    }

    _setCartLS = () => {
        if (this.cart.length < 1) {
            this.resetCart()
        } else {
            localStorage.setItem(this._key, JSON.stringify(this.cart))
        }
    }

    addProduct = (id) => {
        if (!this.cart.includes(id)) {
            this.cart.push(id)
            this._setCartLS()
            this._toggleShowFloatingBasket()
            return 'added'
        }
    }

    removeProduct = (id) => {
        if (this.cart.includes(id)) {
            this.cart.splice(this.cart.indexOf(id), 1)
            this._setCartLS()
            this._toggleShowFloatingBasket()
            return 'deleted'
        }
    }

    toggleProduct = (id) => {
        return this.removeProduct(id) ?? this.addProduct(id)
    }

    _toggleShowFloatingBasket = () => {
        if (this.cart.length > 0) {
            if (!this.floatingBasket) {
                this._createFloatingBasket()
            }
            this._fillFloatingBasket()
        } else {
            if (this.floatingBasket) {
                this.floatingBasket.remove()
                this.floatingBasket = null
            }
        }
    }

    _fillFloatingBasket = () => {
        const list = this.floatingBasket.querySelector('.floating-basket__list')
        list.innerHTML = ''
        this.cart.forEach((productId) => {
            const text = `Элемент с id ${productId}`
            const newItem = this._createElement('div', 'floating-basket__item', text)
            const buttonRemove = this._createElement('button', 'floating-basket__remove')
            buttonRemove.addEventListener('click', () => {
                try {
                    document.querySelector(`[data-productid="${productId}"] .products-card__add-to-cart`)
                        .innerText = this._text.add
                } catch {
                }
                this.removeProduct(productId)
            })
            newItem.appendChild(buttonRemove)
            list.appendChild(newItem)
        })
    }

    _createElement = (tag, classNames, text) => {
        const newElement = document.createElement(tag)
        if (classNames) newElement.classList.add(classNames)
        if (text) newElement.innerText = text
        return newElement
    }

    _createFloatingBasket = () => {
        const floatingBasket = this._createElement('div', 'floating-basket')

        floatingBasket.appendChild(
            this._createElement('span', 'floating-basket__title', 'Корзина')
        )
        floatingBasket.appendChild(
            this._createElement('div', 'floating-basket__list')
        )
        const link = this._createElement('a', 'floating-basket__button', 'Оформить')
        link.setAttribute('href', this._linkCreateOrder)
        floatingBasket.appendChild(link)

        this.floatingBasket = floatingBasket
        document.body.appendChild(floatingBasket)
    }

}

const userCart = new UserCart()