import { t, i18n } from '../i18n.js';
import { escapeHTML, formatPrice } from '../utils/helpers.js';

class ListingCard extends HTMLElement {
    static get observedAttributes() {
        return ['listing-id', 'title', 'price', 'currency', 'location', 'image'];
    }

    constructor() {
        super();
        this.isFavorite = false;
    }

    connectedCallback() {
        this.loadFavoriteState();
        this.render();
        this.setupEventListeners();
    }

    attributeChangedCallback() {
        if (this.isConnected) {
            this.render();
            this.setupEventListeners();
        }
    }

    loadFavoriteState() {
        const id = this.getAttribute('listing-id');
        if (id) {
            const favorites = JSON.parse(localStorage.getItem('favorites') || '[]');
            this.isFavorite = favorites.includes(id);
        }
    }

    saveFavoriteState() {
        const id = this.getAttribute('listing-id');
        if (!id) return;
        
        let favorites = JSON.parse(localStorage.getItem('favorites') || '[]');
        
        if (this.isFavorite) {
            if (!favorites.includes(id)) favorites.push(id);
        } else {
            favorites = favorites.filter(f => f !== id);
        }
        
        localStorage.setItem('favorites', JSON.stringify(favorites));
    }

    render() {
        const id = this.getAttribute('listing-id') || '';
        const title = this.getAttribute('title') || t('home.placeholderTitle');
        const price = this.getAttribute('price');
        const currency = this.getAttribute('currency') || 'EUR';
        const location = this.getAttribute('location') || t('home.placeholderLocation');
        const image = this.getAttribute('image');
        
        const priceDisplay = price ? formatPrice(parseFloat(price), currency) : '–';
        const favoriteLabel = this.isFavorite ? t('home.removeFavorite') : t('home.addFavorite');
        
        this.innerHTML = /* html */ `
            <a href="#/listing/${escapeHTML(id)}" class="listing-link">
                <div class="listing-image" ${image ? `style="background-image: url('${escapeHTML(image)}')"` : ''}></div>
                <div class="listing-info">
                    <h3 class="listing-title">${escapeHTML(title)}</h3>
                    <p class="listing-price">${priceDisplay}</p>
                    <p class="listing-location">${escapeHTML(location)}</p>
                </div>
            </a>
            <button 
                class="favorite-btn ${this.isFavorite ? 'active' : ''}" 
                aria-label="${favoriteLabel}"
                aria-pressed="${this.isFavorite}"
            >
                <svg class="heart-icon" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
                    <path d="M20.84 4.61a5.5 5.5 0 0 0-7.78 0L12 5.67l-1.06-1.06a5.5 5.5 0 0 0-7.78 7.78l1.06 1.06L12 21.23l7.78-7.78 1.06-1.06a5.5 5.5 0 0 0 0-7.78z"></path>
                </svg>
            </button>
        `;
    }

    setupEventListeners() {
        const btn = this.querySelector('.favorite-btn');
        btn?.addEventListener('click', (e) => {
            e.preventDefault();
            e.stopPropagation();
            this.toggleFavorite();
        });
    }

    toggleFavorite() {
        this.isFavorite = !this.isFavorite;
        this.saveFavoriteState();
        
        const btn = this.querySelector('.favorite-btn');
        btn?.classList.toggle('active', this.isFavorite);
        btn?.setAttribute('aria-pressed', this.isFavorite);
        btn?.setAttribute('aria-label', this.isFavorite ? t('home.removeFavorite') : t('home.addFavorite'));
        
        btn?.classList.add('animate__animated', 'animate__heartBeat');
        btn?.addEventListener('animationend', () => {
            btn?.classList.remove('animate__animated', 'animate__heartBeat');
        }, { once: true });
        
        this.dispatchEvent(new CustomEvent('favorite-toggle', {
            bubbles: true,
            detail: { id: this.getAttribute('listing-id'), isFavorite: this.isFavorite }
        }));
    }
}

customElements.define('listing-card', ListingCard);

const style = document.createElement('style');
style.textContent = /* css */ `
    listing-card {
        display: block;
        position: relative;
        background: var(--color-bg-secondary);
        border: 1px solid var(--color-border);
        border-radius: var(--radius-md);
        overflow: hidden;
        transition: box-shadow var(--transition-fast);
    }
    
    listing-card:hover {
        box-shadow: var(--shadow-md);
    }
    
    listing-card .listing-link {
        display: block;
        text-decoration: none;
        color: inherit;
    }
    
    listing-card .listing-image {
        aspect-ratio: 1;
        background: var(--color-bg-tertiary);
        background-size: cover;
        background-position: center;
    }
    
    listing-card .listing-info {
        padding: var(--space-sm);
    }
    
    listing-card .listing-title {
        font-size: var(--font-size-sm);
        font-weight: var(--font-weight-medium);
        margin: 0 0 var(--space-xs);
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }
    
    listing-card .listing-price {
        font-size: var(--font-size-sm);
        font-weight: var(--font-weight-bold);
        color: var(--color-primary);
        margin: 0;
    }
    
    listing-card .listing-location {
        font-size: var(--font-size-xs);
        color: var(--color-text-muted);
        margin: 0;
    }
    
    listing-card .favorite-btn {
        position: absolute;
        top: var(--space-sm);
        right: var(--space-sm);
        width: 36px;
        height: 36px;
        display: flex;
        align-items: center;
        justify-content: center;
        background: var(--color-bg);
        border: none;
        border-radius: var(--radius-full);
        cursor: pointer;
        box-shadow: var(--shadow-sm);
        transition: all var(--transition-fast);
        z-index: 1;
    }
    
    listing-card .favorite-btn:hover {
        transform: scale(1.1);
    }
    
    listing-card .favorite-btn .heart-icon {
        color: var(--color-text-muted);
        transition: all var(--transition-fast);
    }
    
    listing-card .favorite-btn.active .heart-icon {
        fill: var(--color-error);
        stroke: var(--color-error);
        color: var(--color-error);
    }
    
    listing-card .favorite-btn:hover .heart-icon {
        color: var(--color-error);
    }
`;
document.head.appendChild(style);