@page "/stock/productimport"
@using phronCare.UIBlazor.Services.Stock

@inject IJSRuntime JS
@inject IToastService toastService
@inject NavigationManager Navigation
@inject LSProductService productService

<h3 class="mb-4">Importación masiva de productos</h3>

<div class="mb-3">
    <button class="btn btn-primary" @onclick="DownloadTemplate">Descargar plantilla Excel</button>
</div>

<div class="mb-4">
    <label for="fileUpload" class="form-label fw-semibold">Seleccionar archivo Excel</label>
    <div class="input-group">
        <label class="input-group-text bg-light border-secondary" for="fileUpload">📎</label>
        <InputFile id="fileUpload" class="form-control" OnChange="HandleFileSelected" accept=".xlsx" />
    </div>
</div>

@if (UploadedFile != null)
{
    <div class="mb-4">
        <button class="btn btn-warning" @onclick="ProcessFile">Procesar archivo Excel</button>
    </div>
}

@if (PreviewItems != null)
{
    <h5 class="mt-4">Vista previa</h5>
    <table class="table table-sm table-bordered">
        <thead>
            <tr>
                <th>Cód. Fábrica</th>
                <th>Nombre</th>
                <th>Descripción</th>
                <th>Tipo</th>
                <th>Trazabilidad</th>
                <th>División</th>
                <th>Unidad</th>
                <th>Plus</th>
                <th>Cód. Ext.</th>
                <th>Errores</th>
            </tr>
        </thead>
        <tbody>
            @foreach (var item in PreviewItems)
            {
                <tr class="@(item.HasError ? "table-danger" : null)">
                    <td>@item.FactoryCode</td>
                    <td>@item.Name</td>
                    <td>@item.Description</td>
                    <td>@item.ProductType</td>
                    <td>@item.TraceabilityType</td>
                    <td>@item.DivisionCode</td>
                    <td>@item.UnitCode</td>
                    <td>@(item.PlusProcess ? "Sí" : "No")</td>
                    <td>@item.ExternalCode</td>
                    <td>@item.ErrorMessage</td>
                </tr>
            }
        </tbody>
    </table>

    <div class="mt-3 d-flex justify-content-end gap-2">
        <button class="btn btn-outline-secondary" @onclick="SimulateImport">Simular importación</button>
        <button class="btn btn-success" @onclick="ConfirmImport" disabled="@(PreviewItems.All(x => x.HasError))">Importar productos</button>
    </div>
}

@code {
    private List<ProductImportPreviewDto>? PreviewItems;
    private IBrowserFile? UploadedFile;

    protected override void OnInitialized()
    {
        PreviewItems = new List<ProductImportPreviewDto>
        {
            new() { FactoryCode = "ZIM001", Name = "Clavo tibial largo", Description = "Clavo para tibia", ProductType = 1, TraceabilityType = 3, DivisionCode = "ZIM", UnitCode = "UN", PlusProcess = true, ExternalCode = "EXT001" },
            new() { FactoryCode = "ZIM002", Name = "Tornillo esponjoso", Description = "Tornillo de 6.5mm", ProductType = 1, TraceabilityType = 3, DivisionCode = "ZIM", UnitCode = "UN", PlusProcess = false, ExternalCode = "EXT002" },
            new() { FactoryCode = "ZIM003", Name = "Placa de compresión", Description = "Placa DCP 4.5", ProductType = 1, TraceabilityType = 2, DivisionCode = "ZIM", UnitCode = "UN", PlusProcess = false, ExternalCode = "EXT003" },
            new() { FactoryCode = "ZIM004", Name = "Caja instrumental", Description = "Caja para implantes", ProductType = 2, TraceabilityType = 1, DivisionCode = "ZIM", UnitCode = "CJ", PlusProcess = false, ExternalCode = "EXT004", ErrorMessage = "Unidad no reconocida" },
            new() { FactoryCode = "ZIM005", Name = "Perno cortical", Description = "Perno de fijación", ProductType = 1, TraceabilityType = 3, DivisionCode = "ZIM", UnitCode = "UN", PlusProcess = true, ExternalCode = "EXT005" }
        };
    }

    private async Task DownloadTemplate()
    {
        try
        {
            await productService.DownloadTemplateAsync();
        }
        catch (Exception ex)
        {
            toastService.ShowError($"Error al descargar la plantilla: {ex.Message}");
        }
    }

    private async Task HandleFileSelected(InputFileChangeEventArgs e)
    {
        UploadedFile = e.File;
        //PreviewItems = null; // Limpiar preview anterior
    }

    private async Task ProcessFile()
    {
        if (UploadedFile == null) return;

        using var stream = UploadedFile.OpenReadStream(10 * 1024 * 1024);
        using var ms = new MemoryStream();
        await stream.CopyToAsync(ms);
        var content = ms.ToArray();

        // Aquí deberías llamar al backend para validar y obtener la vista previa
        // Por ahora se simula con los datos ya cargados en OnInitialized
        // PreviewItems = await Http.PostAsJsonAsync(...)
    }

    private async Task SimulateImport()
    {
        // Lógica futura para simular importación
    }

    private async Task ConfirmImport()
    {
        // Lógica futura para guardar los productos
    }

    public class ProductImportPreviewDto
    {
        public string FactoryCode { get; set; } = string.Empty;
        public string Name { get; set; } = string.Empty;
        public string Description { get; set; } = string.Empty;
        public int ProductType { get; set; }
        public int TraceabilityType { get; set; }
        public string DivisionCode { get; set; } = string.Empty;
        public string UnitCode { get; set; } = string.Empty;
        public bool PlusProcess { get; set; }
        public string ExternalCode { get; set; } = string.Empty;
        public string? ErrorMessage { get; set; }
        public bool HasError => !string.IsNullOrWhiteSpace(ErrorMessage);
    }
}