@using PowderCoating.Application.DTOs.PurchaseOrder
@model UpdatePurchaseOrderDto

@{
    ViewData["Title"] = $"Edit {ViewBag.PoNumber}";
    int poId = (int)ViewBag.PoId;
}

@section Scripts {
    <script id="inventoryItemsData" type="application/json">@Html.Raw(ViewBag.InventoryItemsJson ?? "[]")</script>
    <script id="existingItemsData" type="application/json">@Html.Raw(System.Text.Json.JsonSerializer.Serialize(Model.Items.Select(i => new {
        type          = i.InventoryItemId.HasValue ? "inventory" : "custom",
        selectedId    = i.InventoryItemId,
        description   = i.Description,
        uom           = i.UnitOfMeasure,
        qty           = i.QuantityOrdered,
        cost          = i.UnitCost,
        notes         = i.Notes
    })))</script>
    <script src="~/js/purchase-orders.js"></script>
}

<div class="d-flex justify-content-between align-items-center mb-3">
    <h4 class="mb-0">Edit @ViewBag.PoNumber</h4>
    <a asp-action="Details" asp-route-id="@poId" class="btn btn-sm btn-outline-secondary">
        <i class="bi bi-arrow-left"></i> Cancel
    </a>
</div>

<div class="alert alert-info alert-permanent d-flex align-items-center gap-2 mb-3">
    <i class="bi bi-info-circle-fill"></i>
    <span>Only <strong>Draft</strong> purchase orders can be edited.</span>
</div>

@if (!ViewData.ModelState.IsValid)
{
    <div class="alert alert-danger alert-permanent">
        <ul class="mb-0">
            @foreach (var error in ViewData.ModelState.Values.SelectMany(v => v.Errors))
            {
                <li>@error.ErrorMessage</li>
            }
        </ul>
    </div>
}

<form asp-action="Edit" asp-route-id="@poId" method="post">
    @Html.AntiForgeryToken()

    <div class="row g-3">
        <div class="col-lg-8">
            <div class="card border-0 shadow-sm mb-3">
                <div class="card-header bg-transparent fw-semibold">Order Details</div>
                <div class="card-body">
                    <div class="row g-3">
                        <div class="col-md-6">
                            <label asp-for="VendorId" class="form-label fw-semibold">Vendor <span class="text-danger">*</span></label>
                            <select asp-for="VendorId" asp-items="@ViewBag.Vendors" class="form-select"
                                    data-quick-add-url="/Vendors/Create" data-quick-add-title="Add New Vendor">
                                <option value="__new__">+ Add New Vendor&hellip;</option>
                            </select>
                            <span asp-validation-for="VendorId" class="text-danger small"></span>
                        </div>
                        <div class="col-md-3">
                            <label asp-for="OrderDate" class="form-label fw-semibold">Order Date</label>
                            <input asp-for="OrderDate" type="date" class="form-control"
                                   value="@Model.OrderDate.ToString("yyyy-MM-dd")" />
                        </div>
                        <div class="col-md-3">
                            <label asp-for="ExpectedDeliveryDate" class="form-label fw-semibold">Expected Delivery</label>
                            <input asp-for="ExpectedDeliveryDate" type="date" class="form-control"
                                   value="@Model.ExpectedDeliveryDate?.ToString("yyyy-MM-dd")" />
                        </div>
                    </div>
                </div>
            </div>

            <div class="card border-0 shadow-sm mb-3">
                <div class="card-header bg-transparent d-flex justify-content-between align-items-center">
                    <span class="fw-semibold">Line Items</span>
                    <button type="button" class="btn btn-sm btn-primary" onclick="addItem()">
                        <i class="bi bi-plus-lg"></i> Add Item
                    </button>
                </div>
                <div class="card-body p-0">
                    <div id="emptyItemsMessage" class="text-center py-4 text-muted"
                         style="display:@(Model.Items.Any() ? "none" : "block")">
                        <i class="bi bi-cart-plus d-block" style="font-size:2rem;"></i>
                        <p class="mb-0 mt-1 small">Click "Add Item" to add line items.</p>
                    </div>
                    <div class="table-responsive">
                        <table class="table mb-0">
                            <thead class="table-light small" id="lineItemsHeader"
                                   style="display:@(Model.Items.Any() ? "" : "none")">
                                <tr>
                                    <th style="min-width:240px">Item / Description</th>
                                    <th style="width:95px">Qty</th>
                                    <th style="width:110px">Unit Cost</th>
                                    <th style="width:100px" class="text-end">Line Total</th>
                                    <th>Notes</th>
                                    <th style="width:50px"></th>
                                </tr>
                            </thead>
                            <tbody id="lineItemsBody">
                            </tbody>
                        </table>
                    </div>
                </div>
            </div>

            <div class="card border-0 shadow-sm">
                <div class="card-body">
                    <div class="row g-3">
                        <div class="col-md-6">
                            <label asp-for="Notes" class="form-label fw-semibold">Notes</label>
                            <textarea asp-for="Notes" class="form-control" rows="3"
                                      placeholder="Visible on PO&hellip;"></textarea>
                        </div>
                        <div class="col-md-6">
                            <label asp-for="InternalNotes" class="form-label fw-semibold">Internal Notes</label>
                            <textarea asp-for="InternalNotes" class="form-control" rows="3"
                                      placeholder="Internal use only&hellip;"></textarea>
                        </div>
                    </div>
                </div>
            </div>
        </div>

        <div class="col-lg-4">
            <div class="card border-0 shadow-sm mb-3">
                <div class="card-header bg-transparent fw-semibold">Totals</div>
                <div class="card-body">
                    <div class="d-flex justify-content-between mb-2">
                        <span class="text-muted">Subtotal</span>
                        <span id="subTotalDisplay" class="fw-semibold">$0.00</span>
                    </div>
                    <div class="mb-3">
                        <label asp-for="ShippingCost" class="form-label small text-muted">Shipping Cost</label>
                        <div class="input-group input-group-sm">
                            <span class="input-group-text">$</span>
                            <input asp-for="ShippingCost" id="shippingCostInput" type="number"
                                   class="form-control" min="0" step="0.01" oninput="updateTotals()" />
                        </div>
                    </div>
                    <hr />
                    <div class="d-flex justify-content-between">
                        <span class="fw-bold">Grand Total</span>
                        <span id="grandTotalDisplay" class="fw-bold fs-5">$0.00</span>
                    </div>
                </div>
            </div>

            <div class="d-grid gap-2">
                <button type="submit" class="btn btn-primary">
                    <i class="bi bi-save me-1"></i> Save Changes
                </button>
                <a asp-action="Details" asp-route-id="@poId" class="btn btn-outline-secondary">Cancel</a>
            </div>
        </div>
    </div>
</form>

<script>
    document.addEventListener('DOMContentLoaded', () => {
        const existing = JSON.parse(document.getElementById('existingItemsData')?.textContent || '[]');
        const tbody = document.getElementById('lineItemsBody');
        const header = document.getElementById('lineItemsHeader');
        existing.forEach(item => {
            const i = itemIndex++;
            const tr = document.createElement('tr');
            tr.setAttribute('data-index', i);
            tr.innerHTML = buildRowHtml(i, item);
            tbody.appendChild(tr);
        });
        if (header) header.style.display = existing.length > 0 ? '' : 'none';
        toggleEmptyMessage();
        updateTotals();
    });
</script>