@page "/orders"
@inject PurchaseItemService PurchaseItemService
@inject SupplierService SupplierService
@inject NavigationManager Navigation
@using CutList.Core.Formatting
@using CutList.Web.Data.Entities

<PageTitle>Orders</PageTitle>

<div class="d-flex justify-content-between align-items-center mb-3">
    <h1>To Be Ordered</h1>
    <a href="orders/add" class="btn btn-primary">Add Item</a>
</div>

<p class="text-muted mb-4">
    Track material that needs to be ordered from suppliers. Items are added manually or automatically from job optimization results.
</p>

@if (loading)
{
    <p><em>Loading...</em></p>
}
else
{
    <ul class="nav nav-tabs mb-3">
        <li class="nav-item">
            <button class="nav-link @(activeTab == "pending" ? "active" : "")" @onclick='() => SetTab("pending")'>
                Pending
                @if (pendingCount > 0)
                {
                    <span class="badge bg-warning text-dark ms-1">@pendingCount</span>
                }
            </button>
        </li>
        <li class="nav-item">
            <button class="nav-link @(activeTab == "ordered" ? "active" : "")" @onclick='() => SetTab("ordered")'>
                Ordered
                @if (orderedCount > 0)
                {
                    <span class="badge bg-primary ms-1">@orderedCount</span>
                }
            </button>
        </li>
        <li class="nav-item">
            <button class="nav-link @(activeTab == "all" ? "active" : "")" @onclick='() => SetTab("all")'>All</button>
        </li>
    </ul>

    @if (tabItems.Count == 0)
    {
        <div class="alert alert-info">
            @if (activeTab == "pending")
            {
                <span>No pending items. <a href="orders/add">Add an item</a> or use "Add to Order List" from a job's results page.</span>
            }
            else if (activeTab == "ordered")
            {
                <span>No ordered items.</span>
            }
            else
            {
                <span>No order items found. <a href="orders/add">Add your first item</a>.</span>
            }
        </div>
    }
    else
    {
        <MaterialFilter AvailableGrades="availableGrades" Value="filterState" ValueChanged="OnFilterChanged" />

        @if (filteredItems.Count == 0)
        {
            <div class="alert alert-warning">
                No items match your filters.
            </div>
        }
        else
        {
            <table class="table table-striped table-hover">
                <thead>
                    <tr>
                        <th>Material</th>
                        <th>Length</th>
                        <th>Qty</th>
                        <th>Supplier</th>
                        <th>Job</th>
                        <th>Status</th>
                        <th>Notes</th>
                        <th style="width: 140px;">Actions</th>
                    </tr>
                </thead>
                <tbody>
                    @foreach (var item in pagedItems)
                    {
                        <tr>
                            <td>@item.StockItem.Material.DisplayName</td>
                            <td>@ArchUnits.FormatFromInches((double)item.StockItem.LengthInches)</td>
                            <td>@item.Quantity</td>
                            <td>
                                <select class="form-select form-select-sm" style="min-width: 140px;"
                                        value="@(item.SupplierId?.ToString() ?? "")"
                                        @onchange="(e) => OnSupplierChanged(item, e)">
                                    <option value="">-- Select --</option>
                                    @foreach (var supplier in suppliers)
                                    {
                                        <option value="@supplier.Id">@supplier.Name</option>
                                    }
                                </select>
                            </td>
                            <td>
                                @if (item.Job != null)
                                {
                                    <a href="jobs/@item.Job.Id">@item.Job.DisplayName</a>
                                }
                                else
                                {
                                    <span class="text-muted">-</span>
                                }
                            </td>
                            <td>
                                <span class="badge @GetStatusBadgeClass(item.Status)">@item.Status</span>
                            </td>
                            <td>
                                <span class="text-muted small">@(item.Notes ?? "-")</span>
                            </td>
                            <td>
                                <div class="d-flex gap-1">
                                    @if (item.Status == PurchaseItemStatus.Pending)
                                    {
                                        <button class="btn btn-sm btn-outline-primary" @onclick="() => MarkOrdered(item)" title="Mark Ordered">
                                            <i class="bi bi-truck"></i>
                                        </button>
                                    }
                                    @if (item.Status == PurchaseItemStatus.Ordered)
                                    {
                                        <button class="btn btn-sm btn-outline-success" @onclick="() => MarkReceived(item)" title="Mark Received">
                                            <i class="bi bi-check-lg"></i>
                                        </button>
                                    }
                                    <button class="btn btn-sm btn-outline-danger" @onclick="() => ConfirmDelete(item)" title="Delete">
                                        <i class="bi bi-trash"></i>
                                    </button>
                                </div>
                            </td>
                        </tr>
                    }
                </tbody>
            </table>

            <Pager TotalCount="filteredItems.Count" PageSize="pageSize" CurrentPage="currentPage" CurrentPageChanged="OnPageChanged" />
        }
    }
}

<ConfirmDialog @ref="deleteDialog"
               Title="Delete Order Item"
               Message="@deleteMessage"
               ConfirmText="Delete"
               OnConfirm="DeleteConfirmed" />

@code {
    private List<PurchaseItem> allItems = new();
    private List<Supplier> suppliers = new();
    private bool loading = true;
    private string activeTab = "pending";
    private int currentPage = 1;
    private int pageSize = 25;
    private ConfirmDialog deleteDialog = null!;
    private PurchaseItem? itemToDelete;
    private string deleteMessage = "";
    private MaterialFilterState filterState = new();

    private int pendingCount => allItems.Count(i => i.Status == PurchaseItemStatus.Pending);
    private int orderedCount => allItems.Count(i => i.Status == PurchaseItemStatus.Ordered);

    private List<PurchaseItem> tabItems => activeTab switch
    {
        "pending" => allItems.Where(i => i.Status == PurchaseItemStatus.Pending).ToList(),
        "ordered" => allItems.Where(i => i.Status == PurchaseItemStatus.Ordered).ToList(),
        _ => allItems
    };

    private List<PurchaseItem> filteredItems => tabItems.Where(i =>
    {
        var m = i.StockItem.Material;
        if (filterState.Shape.HasValue && m.Shape != filterState.Shape.Value)
            return false;
        if (filterState.Type.HasValue && m.Type != filterState.Type.Value)
            return false;
        if (!string.IsNullOrEmpty(filterState.Grade) && m.Grade != filterState.Grade)
            return false;
        if (!string.IsNullOrWhiteSpace(filterState.SearchText))
        {
            var search = filterState.SearchText.Trim();
            if (!Contains(m.Size, search)
                && !Contains(m.Grade, search)
                && !Contains(m.Shape.GetDisplayName(), search)
                && !Contains(i.Notes, search)
                && !Contains(i.Job?.DisplayName, search)
                && !Contains(i.Supplier?.Name, search))
                return false;
        }
        return true;
    }).ToList();

    private IEnumerable<string> availableGrades => tabItems
        .Select(i => i.StockItem.Material.Grade)
        .Where(g => !string.IsNullOrEmpty(g))
        .Distinct()
        .OrderBy(g => g)!;

    private IEnumerable<PurchaseItem> pagedItems => filteredItems
        .Skip((currentPage - 1) * pageSize)
        .Take(pageSize);

    protected override async Task OnInitializedAsync()
    {
        allItems = await PurchaseItemService.GetAllAsync();
        suppliers = await SupplierService.GetAllAsync();
        loading = false;
    }

    private void SetTab(string tab)
    {
        activeTab = tab;
        currentPage = 1;
        filterState = new();
    }

    private void OnFilterChanged(MaterialFilterState state)
    {
        filterState = state;
        currentPage = 1;
    }

    private async Task OnSupplierChanged(PurchaseItem item, ChangeEventArgs e)
    {
        int? supplierId = int.TryParse(e.Value?.ToString(), out var id) && id > 0 ? id : null;
        await PurchaseItemService.UpdateSupplierAsync(item.Id, supplierId);
        item.SupplierId = supplierId;
        item.Supplier = supplierId.HasValue ? suppliers.FirstOrDefault(s => s.Id == supplierId.Value) : null;
    }

    private async Task MarkOrdered(PurchaseItem item)
    {
        await PurchaseItemService.UpdateStatusAsync(item.Id, PurchaseItemStatus.Ordered);
        item.Status = PurchaseItemStatus.Ordered;
    }

    private async Task MarkReceived(PurchaseItem item)
    {
        await PurchaseItemService.UpdateStatusAsync(item.Id, PurchaseItemStatus.Received);
        allItems = await PurchaseItemService.GetAllAsync();

        var totalPages = (int)Math.Ceiling((double)filteredItems.Count / pageSize);
        if (currentPage > totalPages && totalPages > 0)
            currentPage = totalPages;
    }

    private void ConfirmDelete(PurchaseItem item)
    {
        itemToDelete = item;
        deleteMessage = $"Are you sure you want to delete this order item ({item.StockItem.Material.DisplayName} - {ArchUnits.FormatFromInches((double)item.StockItem.LengthInches)} x{item.Quantity})?";
        deleteDialog.Show();
    }

    private async Task DeleteConfirmed()
    {
        if (itemToDelete != null)
        {
            await PurchaseItemService.DeleteAsync(itemToDelete.Id);
            allItems = await PurchaseItemService.GetAllAsync();

            var totalPages = (int)Math.Ceiling((double)filteredItems.Count / pageSize);
            if (currentPage > totalPages && totalPages > 0)
                currentPage = totalPages;
        }
    }

    private void OnPageChanged(int page) => currentPage = page;

    private static string GetStatusBadgeClass(PurchaseItemStatus status) => status switch
    {
        PurchaseItemStatus.Pending => "bg-warning text-dark",
        PurchaseItemStatus.Ordered => "bg-primary",
        PurchaseItemStatus.Received => "bg-success",
        _ => "bg-secondary"
    };

    private static bool Contains(string? value, string search) =>
        value != null && value.Contains(search, StringComparison.OrdinalIgnoreCase);
}