@page "/stock"
@inject StockItemService StockItemService
@inject NavigationManager Navigation
@using CutList.Core.Formatting
@using CutList.Web.Data.Entities

<PageTitle>Stock Items</PageTitle>

<div class="d-flex justify-content-between align-items-center mb-3">
    <h1>Stock Items</h1>
    <a href="stock/new" class="btn btn-primary">Add Stock Item</a>
</div>

<p class="text-muted mb-4">
    Stock items represent the specific lengths of material you have available for cutting. Each stock item links
    a material to a length and tracks how many pieces you have on hand.
</p>

@if (loading)
{
    <p><em>Loading...</em></p>
}
else if (stockItems.Count == 0)
{
    <div class="alert alert-info">
        No stock items found. <a href="stock/new">Add your first stock item</a>.
    </div>
}
else
{
    <MaterialFilter AvailableGrades="availableGrades" Value="filterState" ValueChanged="OnFilterChanged" />

    @if (filteredItems.Count == 0)
    {
        <div class="alert alert-warning">
            No stock items match your filters.
        </div>
    }
    else
    {
        <table class="table table-striped table-hover">
            <thead>
                <tr>
                    <th>Shape</th>
                    <th>Type</th>
                    <th>Grade</th>
                    <th>Size</th>
                    <th>Length</th>
                    <th>On Hand</th>
                    <th style="width: 100px;">Actions</th>
                </tr>
            </thead>
            <tbody>
                @foreach (var item in pagedItems)
                {
                    <tr>
                        <td>@item.Material.Shape.GetDisplayName()</td>
                        <td>@item.Material.Type</td>
                        <td>@item.Material.Grade</td>
                        <td>@item.Material.Size</td>
                        <td>@ArchUnits.FormatFromInches((double)item.LengthInches)</td>
                        <td>
                            @if (item.QuantityOnHand > 0)
                            {
                                <span class="badge bg-success">@item.QuantityOnHand</span>
                            }
                            else
                            {
                                <span class="badge bg-secondary">0</span>
                            }
                        </td>
                        <td>
                            <div class="d-flex gap-1">
                                <a href="stock/@item.Id" class="btn btn-sm btn-outline-primary" title="Edit"><i class="bi bi-pencil"></i></a>
                                <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 Stock Item"
               Message="@deleteMessage"
               ConfirmText="Delete"
               OnConfirm="DeleteConfirmed" />

@code {
    private List<StockItem> stockItems = new();
    private bool loading = true;
    private int currentPage = 1;
    private int pageSize = 25;
    private ConfirmDialog deleteDialog = null!;
    private StockItem? itemToDelete;
    private string deleteMessage = "";
    private MaterialFilterState filterState = new();

    private List<StockItem> filteredItems => stockItems.Where(s =>
    {
        var m = s.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.Description, search)
                && !Contains(m.Shape.GetDisplayName(), search)
                && !Contains(s.Name, search)
                && !Contains(s.Notes, search))
                return false;
        }
        return true;
    }).ToList();

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

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

    protected override async Task OnInitializedAsync()
    {
        stockItems = await StockItemService.GetAllAsync();
        loading = false;
    }

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

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

    private async Task DeleteConfirmed()
    {
        if (itemToDelete != null)
        {
            await StockItemService.DeleteAsync(itemToDelete.Id);
            stockItems = await StockItemService.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 bool Contains(string? value, string search) =>
        value != null && value.Contains(search, StringComparison.OrdinalIgnoreCase);
}