using System;

namespace Superlazy.UI
{
    public abstract class SLUIOnOffTransition : SLUIComponent
    {
        protected bool currentState = false;

        private Action<bool> enableAction;
        private bool changing;

        internal void InitState(SLUIObjectOnOff bindParent)
        {
            if (this.bindParent == null)
            {
                OnInit();
            }
            currentState = false;
        }

        public void StartChange(bool toOn, SLUIEntity uiEntity, Action<bool> updateEnabledAction)
        {
            if (changing) return;

            changing = true;
            currentState = toOn;
            enableAction = updateEnabledAction;

            if (bindParent)
            {
                if (OnUpdate(true))
                {
                    EndChange();
                    return;
                }
            }

            {
                if (currentState)
                {
                    enableAction.Invoke(true);
                }
            }
        }

        protected override void Enable()
        {
        }

        protected override void Disable()
        {
            if (changing == false) return;
            // 언어변경등으로 강제 체인지 된 경우는 메서드 호출을 보장해준다
            ForceDisable();
            currentState = false;
            EndChange();
        }

        private void Update()
        {
            if (changing)
            {
                if (OnUpdate())
                {
                    EndChange();
                }
            }
        }

        protected abstract void ForceDisable();

        protected abstract bool OnUpdate(bool forceUpdate = false);

        private void EndChange()
        {
            if (changing == false) return;

            changing = false;

            if (currentState)
            {
                enableAction.Invoke(true);
            }
            else
            {
                enableAction.Invoke(false);
            }
        }
    }
}