@page "/stock/new"
@page "/stock/{Id:int}"
@inject StockItemService StockItemService
@inject MaterialService MaterialService
@inject NavigationManager Navigation
@using CutList.Core.Formatting

<PageTitle>@(IsNew ? "Add Stock Item" : "Edit Stock Item")</PageTitle>

<h1>@(IsNew ? "Add Stock Item" : $"{stockItem.Material?.DisplayName} - {ArchUnits.FormatFromInches((double)stockItem.LengthInches)}")</h1>

@if (loading)
{
    <p><em>Loading...</em></p>
}
else
{
    <div class="row">
        <div class="col-lg-6 mb-4">
            <div class="card">
                <div class="card-header">
                    <h5 class="mb-0">Stock Item Details</h5>
                </div>
                <div class="card-body">
                    <EditForm Model="stockItem" OnValidSubmit="SaveStockItemAsync">
                        <DataAnnotationsValidator />

                        <div class="mb-3">
                            <label class="form-label">Material</label>
                            <select class="form-select" @bind="stockItem.MaterialId" disabled="@(!IsNew)">
                                <option value="0">-- Select Material --</option>
                                @foreach (var material in materials)
                                {
                                    <option value="@material.Id">@material.DisplayName</option>
                                }
                            </select>
                        </div>

                        <div class="mb-3">
                            <label class="form-label">Length</label>
                            <LengthInput @bind-Value="stockItem.LengthInches" />
                        </div>

                        <div class="mb-3">
                            <label class="form-label">Name (optional)</label>
                            <InputText class="form-control" @bind-Value="stockItem.Name" placeholder="Custom display name" />
                        </div>

                        <div class="mb-3">
                            <label class="form-label">Notes (optional)</label>
                            <InputText class="form-control" @bind-Value="stockItem.Notes" placeholder="Internal notes" />
                        </div>

                        @if (!string.IsNullOrEmpty(errorMessage))
                        {
                            <div class="alert alert-danger">@errorMessage</div>
                        }

                        <div class="d-flex gap-2">
                            <button type="submit" class="btn btn-primary" disabled="@saving">
                                @if (saving)
                                {
                                    <span class="spinner-border spinner-border-sm me-1"></span>
                                }
                                @(IsNew ? "Create Stock Item" : "Save Changes")
                            </button>
                            <a href="stock" class="btn btn-outline-secondary">@(IsNew ? "Cancel" : "Back to List")</a>
                        </div>
                    </EditForm>
                </div>
            </div>
        </div>
    </div>
}

@code {
    [Parameter]
    public int? Id { get; set; }

    private StockItem stockItem = new();
    private List<Material> materials = new();
    private bool loading = true;
    private bool saving;
    private string? errorMessage;

    private bool IsNew => !Id.HasValue;

    protected override async Task OnInitializedAsync()
    {
        materials = await MaterialService.GetAllAsync();

        if (Id.HasValue)
        {
            var existing = await StockItemService.GetByIdAsync(Id.Value);
            if (existing == null)
            {
                Navigation.NavigateTo("stock");
                return;
            }
            stockItem = existing;
        }
        loading = false;
    }

    private async Task SaveStockItemAsync()
    {
        errorMessage = null;
        saving = true;

        try
        {
            if (stockItem.MaterialId == 0)
            {
                errorMessage = "Please select a material";
                return;
            }

            if (stockItem.LengthInches <= 0)
            {
                errorMessage = "Length must be greater than zero";
                return;
            }

            var exists = await StockItemService.ExistsAsync(
                stockItem.MaterialId,
                stockItem.LengthInches,
                IsNew ? null : stockItem.Id);

            if (exists)
            {
                errorMessage = "A stock item with this material and length already exists";
                return;
            }

            try
            {
                if (IsNew)
                {
                    var created = await StockItemService.CreateAsync(stockItem);
                    Navigation.NavigateTo($"stock/{created.Id}");
                }
                else
                {
                    await StockItemService.UpdateAsync(stockItem);
                }
            }
            catch (Microsoft.EntityFrameworkCore.DbUpdateException)
            {
                errorMessage = "A stock item with this material and length already exists (it may have been previously deleted).";
            }
        }
        finally
        {
            saving = false;
        }
    }
}