@typeparam TItem where TItem : class
@using System.Linq.Expressions
@using System.Reflection
@using BlazorWebAssemblyVisaApiClient.Infrastructure.Helpers
@typeparam TMember where TMember : struct, Enum

<InputSelect TValue="TMember" @bind-Value="selected">
    @foreach (var value in enumValues)
    {
        <option value="@value.Key">@value.Value</option>
    }
</InputSelect><br/>

@code {
    [Parameter, EditorRequired] public TItem Model { get; set; } = default!;

    [Parameter, EditorRequired] public Expression<Func<TItem, TMember>> EnumProperty { get; set; } = null!;

    [Parameter] public Action? OnChanged { get; set; }

    private Dictionary<TMember, string> enumValues = new();
    private PropertyInfo modelMemberInfo = null!;
    private TMember selected;

    protected override void OnInitialized()
    {
        var modelMemberName = ((MemberExpression)EnumProperty.Body).Member.Name;
        modelMemberInfo = typeof(TItem).GetProperty(modelMemberName)!;

        foreach (var value in Enum.GetValues<TMember>())
        {
            enumValues.Add(value, value.GetDisplayName());
        }
    }

    protected override void OnAfterRender(bool firstRender)
    {
        var current = (TMember)modelMemberInfo.GetValue(Model)!;
        if (!current.Equals(selected))
        {
            OnValueChanged();
        }
    }

    private void OnValueChanged()
    {
        modelMemberInfo.SetValue(Model, selected);
        OnChanged?.Invoke();
    }

}