using System;
using Avalonia;
using Avalonia.Controls;
using Avalonia.Interactivity;
using ReactiveUI;

namespace DispenserUI.Views.Controls;

/// <summary>
///     按钮 with 加载中动画
/// </summary>
public class LoadingButton : Button
{
    public static readonly StyledProperty<bool> IsLoadingProperty =
        AvaloniaProperty.Register<LoadingButton, bool>(nameof(IsLoading));

    private bool _isCommandExecuting;

    static LoadingButton()
    {
        // Register the IsLoading property to trigger a pseudo-class when it changes
        IsLoadingProperty.Changed.AddClassHandler<LoadingButton>((x, e) => x.UpdatePseudoClasses());
    }

    public LoadingButton()
    {
        // Assign the default style of the button from 'LoadingButton.xaml'
        this.GetObservable(ContentProperty).Subscribe(_ => UpdatePseudoClasses());
        ClickEvent.AddClassHandler<LoadingButton>((x, e) => x.OnDebounceClick(e), RoutingStrategies.Bubble);
    }

    public bool IsLoading
    {
        get => GetValue(IsLoadingProperty);
        set => SetValue(IsLoadingProperty, value);
    }

    private void UpdatePseudoClasses()
    {
        PseudoClasses.Set(":loading", IsLoading);
    }

    private void OnDebounceClick(RoutedEventArgs e)
    {
        if (Command is not IReactiveCommand command) return;

        if (_isCommandExecuting || Command == null) return;

        command.IsExecuting.Subscribe(x =>
            {
                if (x) return;
                _isCommandExecuting = false;
                SetCurrentValue(IsLoadingProperty, false);
                e.Handled = true;
            },
            ex => { },
            () => { });

        var commandParameter = CommandParameter;
        // 检查命令是否可以执行
        if (!Command.CanExecute(commandParameter)) return;

        _isCommandExecuting = true;
        SetCurrentValue(IsLoadingProperty, true);
        // 执行命令
        Command.Execute(commandParameter);
    }
}