using System;
using Cysharp.Threading.Tasks;
using UnityEngine.UIElements;

namespace DanieleMarotta.RiversongCodeShowcase
{
    [UIView("speed-controls-panel")]
    public class SpeedControlsPanelUIView : UIView<SpeedControlsPanelModel>
    {
        private VisualElement _normalSpeedButton;

        private VisualElement _fastSpeedButton;

        private VisualElement _veryFastSpeedButton;

        public event Action<int> SpeedChanged;

        public override UniTask InitializeAsync(UIService uiService, VisualElement rootElement)
        {
            base.InitializeAsync(uiService, rootElement);

            _normalSpeedButton = rootElement.Q(className: "speed-controls-panel__normal-speed");
            _fastSpeedButton = rootElement.Q(className: "speed-controls-panel__fast-speed");
            _veryFastSpeedButton = rootElement.Q(className: "speed-controls-panel__very-fast-speed");

            _normalSpeedButton.RegisterCallback<ClickEvent>(OnNormalSpeedClick);
            _fastSpeedButton.RegisterCallback<ClickEvent>(OnFastSpeedClick);
            _veryFastSpeedButton.RegisterCallback<ClickEvent>(OnVeryFastSpeedClick);

            return UniTask.CompletedTask;
        }

        protected override void OnNewModel(SpeedControlsPanelModel model)
        {
            base.OnNewModel(model);

            UpdateSelected(model.SpeedLevel);
        }

        protected override void OnModelPropertyChanged(object sender, BindablePropertyChangedEventArgs e)
        {
            base.OnModelPropertyChanged(sender, e);

            UpdateSelected(Model.SpeedLevel);
        }

        private void OnNormalSpeedClick(ClickEvent evt)
        {
            SpeedChanged?.Invoke(0);
        }

        private void OnFastSpeedClick(ClickEvent evt)
        {
            SpeedChanged?.Invoke(1);
        }

        private void OnVeryFastSpeedClick(ClickEvent evt)
        {
            SpeedChanged?.Invoke(2);
        }

        public void UpdateSelected(int speedLevel)
        {
            UpdateSelected(_normalSpeedButton, speedLevel == 0);
            UpdateSelected(_fastSpeedButton, speedLevel == 1);
            UpdateSelected(_veryFastSpeedButton, speedLevel == 2);
        }

        private static void UpdateSelected(VisualElement element, bool isSelected)
        {
            if (isSelected)
                element.AddToClassList("selected");
            else
                element.RemoveFromClassList("selected");
        }
    }
}