export class FlowAddToCart extends HTMLElement {
    constructor() {
        super();
    }

    connectedCallback() {
        this.btn = this.querySelector('button');
        if (!this.btn) return;

        this.productId = this.getAttribute('product-id');
        this.btn.addEventListener('click', (e) => {
            e.preventDefault();
            this.addToCart();
        });
    }

    async addToCart() {
        // 1. Check Dates
        const dates = JSON.parse(localStorage.getItem('reservation_dates') || '{}');
        if (!dates.start || !dates.end) {
            // Open Date Picker if no dates
            document.dispatchEvent(new CustomEvent('open-date-picker'));
            return;
        }

        // 2. Loading State
        const originalContent = this.btn.innerHTML;
        this.btn.disabled = true;
        this.btn.innerHTML = '<span class="animate-spin inline-block w-4 h-4 border-2 border-white border-t-transparent rounded-full"></span>';

        try {
            // 3. Check Availability
            const response = await fetch('/produit/check', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({
                    id: this.productId,
                    start: dates.start,
                    end: dates.end
                })
            });

            if (!response.ok) throw new Error('Network error');
            const data = await response.json();

            if (data.dispo) {
                // 4. Add to Cart
                const list = JSON.parse(localStorage.getItem('pl_list') || '[]');
                if (!list.includes(this.productId)) {
                    list.push(this.productId);
                    localStorage.setItem('pl_list', JSON.stringify(list));
                    window.dispatchEvent(new CustomEvent('cart:updated'));
                }
                
                // Open Cart
                const cart = document.querySelector('[is="flow-reserve"]');
                if (cart) cart.open();

            } else {
                // 5. Not Available
                alert("Ce produit n'est pas disponible pour les dates sélectionnées.");
            }

        } catch (error) {
            console.error(error);
            alert("Une erreur est survenue.");
        } finally {
            this.btn.disabled = false;
            this.btn.innerHTML = originalContent;
        }
    }
}