using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UIElements;
using Cysharp.Threading.Tasks;
using System;
namespace BITKit.UX
{
    public class UXBar : UXElement<VisualElement>, IProvider<float>
    {
        [Header(Constant.Header.Settings)]
        public string fillElementName;
        public string labelName;
        [Header(Constant.Header.Output)]
        public Provider onValueChanged;
        [Header(Constant.Header.InternalVariables)]
        VisualElement fillElement;
        Label labelElement;
        public override void OnStart()
        {
            fillElement = visualElement.Q<VisualElement>(fillElementName);
            labelElement = visualElement.Q<Label>(labelName);
            if (visualElement is INotifyValueChanged<float> iNotify)
            {
                iNotify.RegisterValueChangedCallback(OnValueChanged);
            }
        }
        public void Set(int value)
        {
            float w = Mathf.Clamp((float)value / 100 * 100, 0f, 100f);
            Set(w);
        }
        public async void Set(float value)
        {
            try
            {
                await UniTask.SwitchToMainThread(gameObject.GetCancellationTokenOnDestroy());
                switch (visualElement)
                {
                    case INotifyValueChanged<float> iNotify:
                        iNotify.SetValueWithoutNotify(value);
                        break;
                    default:
                        value *= 100;
                        fillElement.style.width = new StyleLength(Length.Percent(value));
                        break;
                }
                if (labelElement is not null)
                    labelElement.text = value.ToString();
            }
            catch (System.Exception e)
            {
                if (e is not OperationCanceledException)
                    throw;
            }
        }
        public async void SetDirect(float progess,string label)
        {
            await UniTask.SwitchToMainThread(gameObject.GetCancellationTokenOnDestroy());
            Set(progess);
            labelElement.text = label;
        }
        float IProvider<float>.Get()
        {
            throw new System.NotImplementedException();
        }

        void OnValueChanged(ChangeEvent<float> changeEvent)
        {
            if(onValueChanged is not null)
                onValueChanged.Set(changeEvent.newValue);
        }
    }
}