using System;
using System.Collections;
using System.Linq;
using UnityEngine;
using UnityEngine.UI;

namespace Studio.UVC.UI
{
    /// <summary>
    /// On/Off 상태를 나타내는 버튼
    /// </summary>
    public class UVCSwitchButton : MonoBehaviour
    {
        private RectTransform rect;
        private Button button_switch;
        private RectTransform switch_rect;
        private Image image_background;

        private bool selected = false;
        public bool Selected { get { return selected; } }

        [SerializeField]
        private float space;
        [SerializeField]
        private float speed_MoveTo;
        [SerializeField]
        private float duration_MoveTo;

        private float switchBtnSize;
        private float bgWidthSize;

        private float process;
        public Action<bool> onClickSwitch;
        private float timer;

        [Header("BG_Color")]
        [SerializeField]
        private Color normalBG;
        [SerializeField]
        private Color SelectBG;
        public void Init()
        {
            rect = GetComponent<RectTransform>();
            button_switch = GetComponentInChildren<Button>();
            switch_rect = button_switch.GetComponent<RectTransform>();
            button_switch.onClick.AddListener(OnClickSwichBtn);
            var images = GetComponentsInChildren<Image>();
            image_background = images.FirstOrDefault(x => x.name.Equals(nameof(image_background), System.StringComparison.OrdinalIgnoreCase));

            image_background.color = normalBG;
            switchBtnSize = switch_rect.sizeDelta.x;
            bgWidthSize = rect.sizeDelta.x;
        }

        private void OnClickSwichBtn()
        {
            StopCoroutine(SwitchOnOff());
            selected = !selected;
            StartCoroutine(SwitchOnOff());
        }
     
        IEnumerator SwitchOnOff()
        {
            ProcessWinding();
            var pos = selected ? new Vector2(bgWidthSize - (switchBtnSize + space), switch_rect.anchoredPosition.y) : new Vector2(space, switch_rect.anchoredPosition.y);
           
            while (process < 1f)
            {
                timer += speed_MoveTo * 0.1f;
                process += timer / duration_MoveTo;
                switch_rect.anchoredPosition = Vector2.Lerp(switch_rect.anchoredPosition,pos, process);
                yield return null;
            }

            image_background.color = selected ? SelectBG : normalBG;
            timer = 0;
            onClickSwitch?.Invoke(selected);
        }

  
        private void ProcessWinding()
        {
            timer = 0;
            if (process > 0f)
            {
                process = 1f - process;
            }
        }
    }
}