DbFirst/DbFirst.BlazorWasm/Pages/Catalogs.razor

@page "/catalogs"
@inject CatalogApiClient Api

<PageTitle>Catalogs</PageTitle>

<h1>Catalogs</h1>

@if (!string.IsNullOrWhiteSpace(errorMessage))
{
    <div class="alert alert-danger" role="alert">@errorMessage</div>
}
else if (!string.IsNullOrWhiteSpace(infoMessage))
{
    <div class="alert alert-success" role="alert">@infoMessage</div>
}

<div class="mb-3">
    <button class="btn btn-primary" @onclick="StartCreate">Neuen Eintrag anlegen</button>
</div>

@if (showForm)
{
    <EditForm Model="formModel" OnValidSubmit="HandleSubmit">
        <div class="row g-3">
            <div class="col-md-6">
                <label class="form-label">Titel</label>
                <InputText class="form-control" @bind-Value="formModel.CatTitle" />
            </div>
            <div class="col-md-6">
                <label class="form-label">Kennung</label>
                <InputText class="form-control" @bind-Value="formModel.CatString" />
            </div>
        </div>

        <div class="mt-3 d-flex gap-2">
            <button type="submit" class="btn btn-success">@((isEditing ? "Speichern" : "Anlegen"))</button>
            <button type="button" class="btn btn-secondary" @onclick="CancelEdit">Abbrechen</button>
        </div>
    </EditForm>
}

@if (isLoading)
{
    <p><em>Lade Daten...</em></p>
}
else if (items.Count == 0)
{
    <p>Keine Einträge vorhanden.</p>
}
else
{
    <table class="table table-striped">
        <thead>
            <tr>
                <th>Id</th>
                <th>Titel</th>
                <th>String</th>
                <th>Angelegt von</th>
                <th>Angelegt am</th>
                <th>Geändert von</th>
                <th>Geändert am</th>
                <th></th>
            </tr>
        </thead>
        <tbody>
            @foreach (var item in items)
            {
                <tr>
                    <td>@item.Guid</td>
                    <td>@item.CatTitle</td>
                    <td>@item.CatString</td>
                    <td>@item.AddedWho</td>
                    <td>@item.AddedWhen.ToString("g")</td>
                    <td>@item.ChangedWho</td>
                    <td>@(item.ChangedWhen.HasValue ? item.ChangedWhen.Value.ToString("g") : string.Empty)</td>
                    <td class="text-end">
                        <button class="btn btn-sm btn-outline-primary me-2" @onclick="(() => StartEdit(item))">Bearbeiten</button>
                        <button class="btn btn-sm btn-outline-danger" @onclick="(() => DeleteCatalog(item.Guid))">Löschen</button>
                    </td>
                </tr>
            }
        </tbody>
    </table>
}

@code {
    private List<CatalogReadDto> items = new();
    private CatalogWriteDto formModel = new();
    private int editingId;
    private bool isLoading;
    private bool isEditing;
    private bool showForm;
    private string? errorMessage;
    private string? infoMessage;

    protected override async Task OnInitializedAsync()
    {
        await LoadCatalogs();
    }

    private async Task LoadCatalogs()
    {
        isLoading = true;
        errorMessage = null;
        try
        {
            items = await Api.GetAllAsync();
        }
        catch (Exception ex)
        {
            errorMessage = $"Kataloge konnten nicht geladen werden: {ex.Message}";
        }
        finally
        {
            isLoading = false;
            StateHasChanged();
        }
    }

    private void StartCreate()
    {
        formModel = new CatalogWriteDto();
        editingId = 0;
        isEditing = false;
        showForm = true;
        infoMessage = null;
        errorMessage = null;
    }

    private void StartEdit(CatalogReadDto item)
    {
        formModel = new CatalogWriteDto
        {
            CatTitle = item.CatTitle,
            CatString = item.CatString
        };
        editingId = item.Guid;
        isEditing = true;
        showForm = true;
        infoMessage = null;
        errorMessage = null;
    }

    private async Task HandleSubmit()
    {
        errorMessage = null;
        infoMessage = null;

        try
        {
            if (isEditing)
            {
                var updated = await Api.UpdateAsync(editingId, formModel);
                if (!updated)
                {
                    errorMessage = "Aktualisierung fehlgeschlagen.";
                    return;
                }

                infoMessage = "Katalog aktualisiert.";
            }
            else
            {
                var created = await Api.CreateAsync(formModel);
                if (created == null)
                {
                    errorMessage = "Anlegen fehlgeschlagen.";
                    return;
                }

                infoMessage = "Katalog angelegt.";
            }

            showForm = false;
            await LoadCatalogs();
        }
        catch (Exception ex)
        {
            errorMessage = $"Fehler beim Speichern: {ex.Message}";
        }
    }

    private void CancelEdit()
    {
        showForm = false;
        infoMessage = null;
        errorMessage = null;
    }

    private async Task DeleteCatalog(int id)
    {
        errorMessage = null;
        infoMessage = null;

        try
        {
            var deleted = await Api.DeleteAsync(id);
            if (!deleted)
            {
                errorMessage = "Löschen fehlgeschlagen.";
                return;
            }

            infoMessage = "Katalog gelöscht.";
            await LoadCatalogs();
        }
        catch (Exception ex)
        {
            errorMessage = $"Fehler beim Löschen: {ex.Message}";
        }
    }
}