@page "/product/{BookId:long}"
@rendermode InteractiveServer

<div class="product-container">
    @if (IsLoading)
    {
        <div class="text-center py-5">
            <div class="spinner-border text-dark" role="status">
                <span class="visually-hidden">Loading product details...</span>
            </div>
            <p class="text-muted mt-2">Loading curated details...</p>
        </div>
    }
    else if (CurrentProduct == null)
    {
        <div class="text-center py-5 animate-fade-in">
            <svg class="text-muted mb-3" width="48" height="48" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5">
                <circle cx="12" cy="12" r="10" />
                <line x1="12" y1="8" x2="12" y2="12" />
                <line x1="12" y1="16" x2="12.01" y2="16" />
            </svg>
            <h2 class="h5 text-dark fw-medium">Artifact Not Found</h2>
            <p class="text-muted small">The requested book could not be found in our current catalog.</p>
            <button class="btn btn-dark btn-sm rounded-pill px-4 mt-2" @onclick='() => Navigation.NavigateTo("/")'>Return to Books</button>
        </div>
    }
    else
    {
        <nav class="breadcrumb">
            <span @onclick='() => Navigation.NavigateTo("/")' class="crumb-link">Books</span>
            <span class="crumb-separator">/</span>
            <span class="crumb-current">@CurrentProduct.Name</span>
        </nav>

        <div class="product-layout">
            <div class="gallery-section">
                <div class="main-image-wrapper">
                    @if (!string.IsNullOrWhiteSpace(ActiveImageUrl))
                    {
                        <img src="@ActiveImageUrl" alt="@CurrentProduct.Name" class="main-image" />
                    }
                    else
                    {
                        <div class="book-spine-fallback-large bg-dark d-flex align-items-center justify-content-center text-center p-4 text-white-50 shadow-sm">
                            <div>
                                <span class="fw-semibold tracking-wider d-block">@PrimaryCategory.ToUpper()</span>
                                <span class="opacity-50 small" style="font-size: 0.65rem;">CURATED EDITION</span>
                            </div>
                        </div>
                    }

                    <div class="format-badges">
                        @if (CurrentProduct.Enabled)
                        {
                            <span class="badge badge-physical">Physical Book</span>
                        }

                        @if (StockCount <= 0)
                        {
                            <span class="badge bg-danger text-white border-0">Out of Stock</span>
                        }
                        else if (StockCount <= 3)
                        {
                            <span class="badge bg-warning text-dark border-0">Only @StockCount Left</span>
                        }
                        else
                        {
                            <span class="badge badge-ebook">In Stock (@StockCount available)</span>
                        }
                    </div>
                </div>

                @if (Thumbnails.Count > 1)
                {
                    <div class="thumbnail-grid">
                        @foreach (var img in Thumbnails)
                        {
                            var currentImg = img;
                            <div class="thumbnail-wrapper @(ActiveImageUrl == currentImg ? "active" : "")"
                                 @onclick="() => ActiveImageUrl = currentImg">
                                <img src="@currentImg" alt="Catalog gallery 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 <= 4 ? "filled" : "")">★</span>
                        }
                        <span class="rating-text">(4.8)</span>
                    </div>
                </div>

                <h1 class="product-title">@CurrentProduct.Name</h1>
                <div class="product-price">R @LivePrice.ToString("N2")</div>

                <div class="purchase-actions">
                    <div class="quantity-picker @(StockCount <= 0 ? "opacity-50 pointer-events-none" : "")">
                        <button @onclick="DecreaseQty" class="qty-btn" disabled="@(StockCount <= 0 || Quantity <= 1)">-</button>
                        <span class="qty-val">@(StockCount <= 0 ? 0 : Quantity)</span>
                        <button @onclick="IncreaseQty" class="qty-btn" disabled="@(StockCount <= 0 || Quantity >= StockCount)">+</button>
                    </div>

                    @if (StockCount > 0)
                    {
                        <button class="btn-add-to-cart" @onclick="HandleAddToCart">
                            Add to Cart
                        </button>
                    }
                    else
                    {
                        <button class="btn-add-to-cart bg-secondary text-white-50 cursor-not-allowed" disabled>
                            Sold Out
                        </button>
                    }
                </div>

                <hr class="divider" />

                @if (!string.IsNullOrWhiteSpace(CurrentProduct.Description))
                {
                    <div class="info-block">
                        <h3>Description</h3>
                        <p class="description-text">@CurrentProduct.Description</p>
                    </div>
                }

                <div class="info-block author-bio-card">
                    <h3>About the Author</h3>
                    <p class="author-bio">
                        @(string.IsNullOrWhiteSpace(CurrentProduct.Metadata?.Manufacturer)
                            ? "Details regarding this publisher/author are maintained inside our curated archives."
                            : $"{CurrentProduct.Metadata.Manufacturer} is globally recognized for their direct contribution to this specific genre spectrum.")
                    </p>
                    <button class="btn-text-link" @onclick="ViewAllAuthorBooks">
                        View all books by @AuthorName →
                    </button>
                </div>
            </div>
        </div>
    }
</div>