@page "/checkout"
@inject NavigationManager Navigation
@rendermode InteractiveServer
@attribute [Authorize]

<div class="checkout-page-container py-5">

    <!-- HANDOVER MODAL VIEW OVERLAY -->
    @if (IsProcessing)
    {
        <div class="processing-screen-overlay">
            <div class="processing-card-box">
                <div class="mb-1">
                    <svg class="payment-vector-loader" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
                        <circle class="loader-track" cx="12" cy="12" r="10" />
                        <path class="loader-handshake-ring" d="M12 2a10 10 0 0 1 10 10" />
                    </svg>
                </div>
                <div>
                    <h4 class="fw-bold text-dark font-monospace text-uppercase tracking-wider mb-2" style="font-size: 1.1rem;">
                        Securing Your Order
                    </h4>
                    <p class="text-muted small mb-0 px-2" style="line-height: 1.5; font-size: 0.85rem;">
                        Please stand by. We are preparing your payment portal and transferring you securely to PayFast.
                    </p>
                </div>
                <div class="secure-badge">
                    <svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round">
                        <rect x="3" y="11" width="18" height="11" rx="2" ry="2"></rect>
                        <path d="M7 11V7a5 5 0 0 1 10 0v4"></path>
                    </svg>
                    <span>Bank-Grade 256-Bit SSL Connection</span>
                </div>
            </div>
        </div>
    }

    <!-- Header Presentation Details -->
    <header class="checkout-header mb-5">
        <span class="text-uppercase font-monospace text-muted tracking-wider small d-block mb-1">Secure Checkout</span>
        <h1 class="checkout-main-title fw-bold">Review Your Order</h1>
    </header>

    @if (ShoppingCart.Items.Any() == false)
    {
        <!-- EMPTY STATE TRAP: Displays when cart hits zero items -->
        <div class="checkout-section-panel text-center py-5 my-4 d-flex flex-column align-items-center gap-3">
            <div class="text-muted opacity-50">
                <svg width="48" height="48" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round">
                    <circle cx="9" cy="21" r="1"></circle>
                    <circle cx="20" cy="21" r="1"></circle>
                    <path d="M1 1h4l2.68 13.39a2 2 0 0 0 2 1.61h9.72a2 2 0 0 0 2-1.61L23 6H6"></path>
                </svg>
            </div>
            <div>
                <h4 class="fw-bold text-dark mb-1">Your cart is empty</h4>
                <p class="text-muted small mb-0">You cannot proceed to payment without selected titles.</p>
            </div>
            <a href="/" class="btn btn-premium-action px-4 py-2 mt-2 text-decoration-none" style="font-size: 0.85rem;">
                Browse Book Catalogue
            </a>
        </div>
    }
    else
    {
        <div class="row g-5">
            <!-- Left Side Forms Layout Matrix -->
            <div class="col-lg-7">

                <!-- SECTION A: SHOPPING CART MANIFEST LIST -->
                <section class="checkout-section-panel mb-4">
                    <div class="panel-header-row d-flex justify-content-between align-items-center mb-4">
                        <h5 class="panel-title fw-bold mb-0">Your Selection</h5>
                        <span class="badge rounded-pill bg-light text-dark font-monospace px-2.5 py-1.5 border">
                            @ShoppingCart.Items.Count Items
                        </span>
                    </div>

                    <div class="checkout-items-stack">
                        @foreach (var item in ShoppingCart.Items)
                        {
                            <div class="checkout-item-row py-3 d-flex align-items-center justify-content-between">
                                <div class="item-meta-details pe-4">
                                    <h6 class="item-product-name fw-bold mb-1 text-dark">@item.Product!.Name</h6>
                                    <span class="item-author-label small text-muted font-monospace">
                                        By @($"{item.Author!.Name} {item.Author.LastName}")
                                    </span>
                                </div>
                                <div class="item-interactive-actions d-flex align-items-center gap-3 flex-shrink-0">
                                    <div class="premium-quantity-stepper">
                                        <button class="step-btn" @onclick="() => ChangeQuantity(item, -1)" aria-label="Decrease quantity">−</button>
                                        <span class="step-value font-monospace">@item.Quantity</span>
                                        <button class="step-btn" @onclick="() => ChangeQuantity(item, 1)" aria-label="Increase quantity">+</button>
                                    </div>
                                    <button class="btn-clean-remove font-monospace text-uppercase" @onclick="() => RemoveFromCart(item)">
                                        Remove
                                    </button>
                                </div>
                            </div>
                        }
                    </div>
                </section>

                <!-- SECTION B: FULFILLMENT SELECTABLE METHODS -->
                <section class="checkout-section-panel mb-4">
                    <h5 class="panel-title fw-bold mb-4">Fulfillment Option</h5>

                    <div class="premium-radio-group d-flex flex-column gap-3">

                        <!-- Collect Card Structure -->
                        <div class="premium-selectable-card @(ShippingCost == 0 ? "active" : "")">
                            <input class="form-check-input visual-hidden" type="radio" name="shipping" id="pickup"
                                   checked=@(ShippingCost == 0) @onclick="() => ShippingCost = 0">
                            <div class="card-indicator-circle"></div>
                            <label class="card-text-block m-0 context-clickable" for="pickup">
                                <span class="card-label-title fw-bold d-block text-dark">Collect from Midrand Bookshop</span>
                                <span class="card-label-desc text-muted small">Corner of Church & Third Roads. Ready within 2 hours.</span>
                            </label>
                            <span class="card-price-tag font-monospace ms-auto text-success fw-bold">FREE</span>
                        </div>

                        <!-- Courier Card Structure -->
                        <div class="premium-selectable-card @(ShippingCost == 60 ? "active" : "")">
                            <input class="form-check-input visual-hidden" type="radio" name="shipping" id="delivery"
                                   checked=@(ShippingCost == 60) @onclick="() => ShippingCost = 60">
                            <div class="card-indicator-circle"></div>
                            <label class="card-text-block m-0 context-clickable" for="delivery">
                                <span class="card-label-title fw-bold d-block text-dark">Door-to-Door Home Delivery</span>
                                <span class="card-label-desc text-muted small">Dispatched via reliable overnight courier straight to your steps.</span>
                            </label>
                            <span class="card-price-tag font-monospace ms-auto text-dark fw-bold">R 60.00</span>
                        </div>
                    </div>
                </section>

                <!-- SECTION C: ADDITIONAL COURIER DELIVERY NOTES -->
                <section class="checkout-section-panel mb-4">
                    <div class="d-flex justify-content-between align-items-baseline mb-2">
                        <h5 class="panel-title fw-bold mb-0">Delivery Instructions</h5>
                        <span class="text-muted font-monospace extra-small opacity-75">Optional</span>
                    </div>
                    <p class="text-muted small mb-3">
                        Add any specific details for our dispatch team (e.g., gate access codes, complex navigation, or safe drop-off preferences).
                    </p>
                    <div class="premium-textarea-wrapper">
                        <textarea class="form-control premium-plaintext-field"
                                  rows="3"
                                  placeholder="Type your notes or courier instructions here..."
                                  @bind="OrderNotes"
                                  maxlength="500">
                        </textarea>
                        <div class="text-end mt-1.5">
                            <small class="font-monospace text-muted extra-small opacity-50">
                                @(OrderNotes?.Length ?? 0) / 500 characters
                            </small>
                        </div>
                    </div>
                </section>

                <!-- SECTION D: BILLING ADDRESS EQUALITY SETTINGS -->
                <section class="checkout-section-panel">
                    <h5 class="panel-title fw-bold mb-3">Billing Settings</h5>
                    <div class="premium-checkbox-wrapper d-flex align-items-center gap-3 p-3 border rounded-3">
                        <input class="form-check-input custom-box-tick m-0" type="checkbox" id="sameAsBilling" @bind="IsSameAddress">
                        <label class="checkbox-text-label small text-dark fw-medium m-0 context-clickable w-100 py-1" for="sameAsBilling">
                            My billing address is the same as my shipping address
                        </label>
                    </div>
                </section>
            </div>

            <!-- Right Side Sidebar Sticky Cost Summary -->
            <div class="col-lg-5">
                <div class="sticky-summary-card p-4 border">
                    <h5 class="fw-bold text-dark font-monospace text-uppercase tracking-wider mb-4 small-summary-heading">Summary Breakdown</h5>

                    <div class="price-summary-ledger d-flex flex-column gap-3">
                        <div class="ledger-row d-flex justify-content-between">
                            <span class="text-muted small">Items Subtotal</span>
                            <span class="font-monospace text-dark fw-medium">R @ShoppingCart.TotalAmount.ToString("F2")</span>
                        </div>

                        <!-- VAT DISPLAY LOGIC SWITCH -->
                        <div class="ledger-row d-flex justify-content-between align-items-center">
                            @if (ShoppingCart.TotalVat > 0)
                            {
                                <span class="text-muted small">Value Added Tax (VAT 15%)</span>
                                <span class="font-monospace text-dark fw-medium">R @ShoppingCart.TotalVat.ToString("F2")</span>
                            }
                            else
                            {
                                <span class="text-muted small">Value Added Tax (VAT)</span>
                                <small class="text-danger fw-medium tracking-wide font-monospace" style="font-size: 0.78rem;">
                                    (Price is VAT inclusive)
                                </small>
                            }
                        </div>

                        <div class="ledger-row d-flex justify-content-between">
                            <span class="text-muted small">Fulfillment Courier Fee</span>
                            <span class="font-monospace text-dark fw-medium">
                                @if (ShippingCost == 0)
                                {
                                    <span class="text-success fw-bold">FREE</span>
                                }
                                else
                                {
                                    <span>R @($"{ShippingCost:F2}")</span>
                                }
                            </span>
                        </div>

                        <hr class="summary-divider my-2" />

                        <div class="ledger-row d-flex justify-content-between align-items-baseline mb-4">
                            <span class="fw-bold text-dark">Total Due Amount</span>
                            <div class="text-end">
                                <span class="font-monospace text-dark fw-bold h3 mb-0 d-block tracking-tight">
                                    R @($"{ShoppingCart.TotalAmount + ShoppingCart.TotalVat + ShippingCost:F2}")
                                </span>
                                <small class="text-muted opacity-60 font-monospace extra-small">ZAR Currency</small>
                            </div>
                        </div>
                    </div>

                    <button class="btn btn-premium-action w-100 py-3.5 d-flex align-items-center justify-content-center gap-2"
                            disabled="@IsProcessing"
                            @onclick="PayNow">
                        <span>Pay Now</span>
                        <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round">
                            <line x1="5" y1="12" x2="19" y2="12"></line>
                            <polyline points="12 5 19 12 12 19"></polyline>
                        </svg>
                    </button>
                </div>
            </div>

            <!-- Automatic PayFast Form Handover Context -->
            @if (IsProcessing == true && CheckoutPayload?.Count > 0)
            {
                <form id="payfastForm" action="@PayfastOptions.Value.CheckoutUrl" method="POST">
                    @foreach (var field in CheckoutPayload)
                    {
                        <input type="hidden" name="@field.Key" value="@field.Value" />
                    }
                </form>
            }
        </div>
    }
</div>