@page "/product/{BookId:long}"
@inject NavigationManager Navigation

<div class="product-container">
    <nav class="breadcrumb">
        <span @onclick='() => Navigation.NavigateTo("/")' class="crumb-link">Books</span>
        <span class="crumb-separator">/</span>
        <span class="crumb-current">@BookTitle</span>
    </nav>

    <div class="product-layout">
        <div class="gallery-section">
            <div class="main-image-wrapper">
                <img src="@ActiveImageUrl" alt="@BookTitle" class="main-image" />

                <div class="format-badges">
                    @if (IsPhysicalBook)
                    {
                        <span class="badge badge-physical">Book</span>
                    }
                    @if (IsEBook)
                    {
                        <span class="badge badge-ebook">E-Book</span>
                    }
                    @if (CanReadOnline)
                    {
                        <span class="badge badge-online">Read Online</span>
                    }
                </div>
            </div>

            <div class="thumbnail-grid">
                @foreach (var img in Thumbnails)
                {
                    <div class="thumbnail-wrapper @(ActiveImageUrl == img ? "active" : "")"
                         @onclick="() => ActiveImageUrl = img">
                        <img src="@img" alt="Thumbnail" />
                    </div>
                }
            </div>
        </div>

        <div class="details-section">
            <div class="meta-header">
                <span class="author-name">@AuthorName</span>
                <div class="rating-stars">
                    @for (int i = 1; i <= 5; i++)
                    {
                        <span class="star @(i <= CurrentRating ? "filled" : "")">★</span>
                    }
                    <span class="rating-text">(@CurrentRating.ToString("F1"))</span>
                </div>
            </div>

            <h1 class="product-title">@BookTitle</h1>
            <div class="product-price">R @Price.ToString("N2")</div>

            <div class="purchase-actions">
                <div class="quantity-picker">
                    <button @onclick="DecreaseQty" class="qty-btn">-</button>
                    <span class="qty-val">@Quantity</span>
                    <button @onclick="IncreaseQty" class="qty-btn">+</button>
                </div>
                <button class="btn-add-to-cart" @onclick="HandleAddToCart">
                    Add to Cart
                </button>
            </div>

            <hr class="divider" />

            <div class="info-block">
                <h3>Description</h3>
                <p class="description-text">@BookDescription</p>
            </div>

            <div class="info-block author-bio-card">
                <h3>About the Author</h3>
                <p class="author-bio">@AuthorBio</p>
                <button class="btn-text-link" @onclick="ViewAllAuthorBooks">
                    View all books by @AuthorName →
                </button>
            </div>
        </div>
    </div>
</div>

@code {
    [Parameter] public long BookId { get; set; }

    // Mock State - In production, pull these via a Service using BookId inside OnInitialized
    private string BookTitle { get; set; } = "Letters from M/M (Paris)";
    private string AuthorName { get; set; } = "M/M Paris";
    private string AuthorBio { get; set; } = "M/M Paris is an art and design partnership consisting of Michaël Amzalag and Mathias Augustyniak, established in 1992. Renowned globally for their influence on fashion, music, and contemporary art layout structures.";
    private string BookDescription { get; set; } = "An exquisite archive tracking visual graphics, typography, and structural design curation over three decades. Beautifully bound with matte-coated plates and custom layouts.";
    private decimal Price { get; set; } = 720.00m;

    // Dynamic Ratings State
    private double CurrentRating { get; set; } = 4.7;

    // Formats supported
    private bool IsPhysicalBook { get; set; } = true;
    private bool IsEBook { get; set; } = true;
    private bool CanReadOnline { get; set; } = false;

    // Image Caching Gallery State
    private string ActiveImageUrl { get; set; } = "images/book-cover-large.png";
    private List<string> Thumbnails { get; set; } = new()
    {
        "images/book-cover-large.png",
        "images/book-inside-1.png",
        "images/book-inside-2.png"
    };

    private int Quantity { get; set; } = 1;

    protected override void OnInitialized()
    {
        // Default the gallery viewer context logic
        if (Thumbnails.Any())
        {
            ActiveImageUrl = Thumbnails.First();
        }
    }

    private void IncreaseQty() => Quantity++;
    private void DecreaseQty() { if (Quantity > 1) Quantity--; }

    private void HandleAddToCart()
    {
        // Event logic hooked into your structural state layout
    }

    private void ViewAllAuthorBooks()
    {
        Navigation.NavigateTo($"/catalog?author={Uri.EscapeDataString(AuthorName)}");
    }
}