@using Microsoft.AspNetCore.Components.Forms

@* Session-medium fields. The hero image is resource-addressed (POST api/release/{id}/session/hero-image)
   and therefore cannot be uploaded until the release exists. The file is selected here, held by the
   parent form, and uploaded after the create call returns a release id — the same deferred-upload
   pattern AlbumHeaderFields uses for cover art ("Will upload on submit"). The hero is optional; the
   parent warns (does not block) when a Session is submitted without one. *@
<MudItem xs="12">
    <MudField Label="Hero Image" Variant="Variant.Outlined" InnerPadding="false">
        <MudStack Spacing="3">
            <MudText Typo="Typo.body2" Color="Color.Default">
                Sessions are single-track live releases. The hero image is the session's primary visual identity.
            </MudText>

            @if (HeroImageFile is { } selectedHero)
            {
                <MudStack Row="true" AlignItems="AlignItems.Center" Spacing="2">
                    <MudText Typo="Typo.body2" Color="Color.Default">Selected: @selectedHero.Name</MudText>
                    <MudIconButton Icon="@Icons.Material.Filled.Clear"
                                   Color="Color.Error"
                                   Size="Size.Small"
                                   Disabled="Disabled"
                                   OnClick="ClearHeroFile"
                                   aria-label="Cancel hero image selection" />
                </MudStack>
            }
            else
            {
                <MudText Typo="Typo.body2" Color="Color.Default">No hero image — optional, but recommended.</MudText>
            }

            <InputFile OnChange="HandleHeroFileSelected" accept="image/*" disabled="@Disabled" />
            @if (HeroImageFile is not null)
            {
                <MudText Typo="Typo.caption">Will upload on submit.</MudText>
            }
        </MudStack>
    </MudField>
</MudItem>

@code {
    [Parameter] public IBrowserFile? HeroImageFile { get; set; }
    [Parameter] public EventCallback<IBrowserFile?> HeroImageFileChanged { get; set; }
    [Parameter] public bool Disabled { get; set; }

    private Task HandleHeroFileSelected(InputFileChangeEventArgs e) =>
        HeroImageFileChanged.InvokeAsync(e.File);

    private Task ClearHeroFile() =>
        HeroImageFileChanged.InvokeAsync(null);
}