/**
 * Book Card Component
 * Reusable card displaying book thumbnail, title, description, author, and price
 * Horizontal layout with image on left and content on right
 */
class BookCard extends HTMLElement {
  static get observedAttributes() {
    return [
      "title",
      "author",
      "description",
      "price",
      "image",
      "href",
      "theme",
    ];
  }

  constructor() {
    super();
    this.attachShadow({ mode: "open" });
  }

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

  setupEventListeners() {
    const addToCartButton = this.shadowRoot?.querySelector("add-to-cart-button");
    if (addToCartButton) {
      addToCartButton.addEventListener("add-to-cart", (e) => {
        e.stopPropagation();
        // Re-dispatch with book details
        this.dispatchEvent(
          new CustomEvent("add-to-cart", {
            bubbles: true,
            composed: true,
            detail: {
              title: this.title,
              author: this.author,
              price: this.price,
            },
          })
        );
      });
    }
  }

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

  get title() {
    return this.getAttribute("title") || "Book Title";
  }

  get author() {
    return this.getAttribute("author") || "Author Name";
  }

  get description() {
    return this.getAttribute("description") || "";
  }

  get price() {
    return this.getAttribute("price") || "$0.00";
  }

  get image() {
    return this.getAttribute("image") || "";
  }

  get href() {
    return this.getAttribute("href") || "book.html";
  }

  get theme() {
    return this.getAttribute("theme") || "light"; // 'light' or 'dark'
  }

  render() {
    const backgroundColor =
      this.theme === "dark"
        ? "var(--color-card-dark-bg, #ebeef4)"
        : "var(--color-background, #ffffff)";

    // Generate placeholder image if none provided
    const imageHtml = this.image
      ? `<img src="${this.image}" alt="${this.title}" class="book-image">`
      : `<div class="book-image placeholder">
           <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1" stroke="currentColor">
             <path stroke-linecap="round" stroke-linejoin="round" d="M12 6.042A8.967 8.967 0 0 0 6 3.75c-1.052 0-2.062.18-3 .512v14.25A8.987 8.987 0 0 1 6 18c2.305 0 4.408.867 6 2.292m0-14.25a8.966 8.966 0 0 1 6-2.292c1.052 0 2.062.18 3 .512v14.25A8.987 8.987 0 0 0 18 18a8.967 8.967 0 0 0-6 2.292m0-14.25v14.25" />
           </svg>
         </div>`;

    this.shadowRoot.innerHTML = `
      <style>
        :host {
          display: block;
        }

        .card {
          display: flex;
          flex-direction: row;
          align-items: stretch;
          gap: var(--spacing-md, 1rem);
          color: inherit;
          background-color: ${backgroundColor};
          border-radius: var(--radius-sm, 0.25rem);
          padding: var(--spacing-md, 1rem);
          transition: transform var(--transition-fast, 150ms ease), 
                      box-shadow var(--transition-fast, 150ms ease);
          min-width: 0;
          overflow: hidden;
        }

        .card:hover {
          transform: translateY(-2px);
          box-shadow: var(--shadow-md, 0 4px 6px -1px rgb(0 0 0 / 0.1));
        }

        .card:active {
          transform: translateY(0);
        }

        .image-container {
          width: 102px;
          min-width: 102px;
          max-width: 102px;
          height: 165px;
          background-color: var(--color-background-tertiary, #f1f5f9);
          overflow: hidden;
          border-radius: var(--radius-sm, 0.25rem);
        }

        .image-link {
          display: block;
          height: 100%;
          text-decoration: none;
          color: inherit;
        }

        .image-link:visited,
        .image-link:hover,
        .image-link:active {
          color: inherit;
          text-decoration: none;
        }

        .book-image {
          width: 100%;
          height: 100%;
          object-fit: cover;
          display: block;
        }

        .book-image.placeholder {
          display: flex;
          align-items: center;
          justify-content: center;
          color: var(--color-text-light, #64748b);
        }

        .book-image.placeholder svg {
          width: 48px;
          height: 48px;
          opacity: 0.5;
        }

        .content-wrapper {
          flex: 1;
          display: flex;
          flex-direction: column;
          overflow: hidden;
        }

        .content {
          height: 100%;
          flex: 1;
          display: flex;
          flex-direction: column;
          gap: var(--spacing-sm, 0.5rem); /* 8px gap between elements */
          justify-content: center;
        }

        .title-link {
          font-family: var(--font-family-outfit, "Outfit", sans-serif);
          font-size: var(--font-size-xl, 1.25rem); /* 20px */
          font-weight: var(--font-weight-bold, 700);
          line-height: var(--line-height-24, 24px);
          color: var(--color-black, #000000);
          text-decoration: underline;
          display: -webkit-box;
          -webkit-line-clamp: 2;
          -webkit-box-orient: vertical;
          overflow: hidden;
        }

        .title-link:hover {
          opacity: 0.8;
        }

        .description {
          margin: 0;
          font-family: var(--font-family-outfit, "Outfit", sans-serif);
          font-size: var(--font-size-base, 1rem); /* 16px */
          font-weight: var(--font-weight-light, 300);
          line-height: var(--line-height-24, 24px);
          color: var(--color-black, #000000);
          display: -webkit-box;
          -webkit-line-clamp: 2;
          -webkit-box-orient: vertical;
          overflow: hidden;
        }

        .author-link {
          font-family: var(--font-family-outfit, "Outfit", sans-serif);
          font-size: var(--font-size-base, 1rem); /* 16px */
          font-weight: var(--font-weight-light, 300);
          line-height: var(--line-height-24, 24px);
          color: var(--color-button-primary, #951d51);
          text-decoration: underline;
          white-space: nowrap;
          overflow: hidden;
          text-overflow: ellipsis;
        }

        .author-link:hover {
          opacity: 0.8;
        }

        .price {
          margin: 0;
          font-family: var(--font-family-outfit, "Outfit", sans-serif);
          font-size: var(--font-size-md, 1rem); /* 16px */
          font-weight: var(--font-weight-bold, 700);
          line-height: var(--line-height-24, 24px);
          color: var(--color-text, #1e293b);
        }

        .actions {
          display: flex;
          justify-content: flex-end;
          margin-top: auto;
        }
      </style>
      <div class="card">
        <a href="${this.href}" class="image-link">
          <div class="image-container">
            ${imageHtml}
          </div>
        </a>
        <div class="content-wrapper">
          <div class="content">
            <a href="${this.href}" class="title-link">${this.title}</a>
            ${
              this.description
                ? `<p class="description">${this.description}</p>`
                : ""
            }
            <a href="${this.href}" class="author-link">${this.author}</a>
            <p class="price">${this.price}</p>
          </div>
          <div class="actions">
            <add-to-cart-button></add-to-cart-button>
          </div>
        </div>
      </div>
    `;
  }
}

customElements.define("book-card", BookCard);