using System;
using TMPro;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;
using UnityEngine.UI;

namespace Studio.UVC.UI
{
    [RequireComponent(typeof(RectTransform))]
    public class UVCButton : MonoBehaviour, IPointerEnterHandler, IPointerExitHandler
    {
        private static GameObject prefab;

        public static UVCButton Create(string text, Transform parent = null)
        {
            if (prefab == null) prefab = Resources.Load("Prefabs/Common/UVCButton", typeof(GameObject)) as GameObject;
            var instance = Instantiate(prefab, parent);
            var btn = instance.GetComponent<UVCButton>();
            if (text != null && text.Length > 0) btn.GetComponentInChildren<TextMeshProUGUI>().text = text;
            return btn;
        }

        [SerializeField]
        private bool selected = false;
        public bool Selected { get => selected; }

        public int Index { get; set; }

        private TextMeshProUGUI txt;

        private UnityEngine.UI.Button button;
        public Button UVCClickButton { get { return button; } }
        private RectTransform rect;
        public RectTransform Rect { get { return rect; } }

        private Image image;
        public Image Image { get { return image; } }

        public float Space = 8f;

        [Header("Color")]
        public Color normalColor;
        public Color HighLightColor;
        public Color selectColor;

        [Header("Sprite")]
        public Sprite normalSprite;
        public Sprite selectSprite;

        public UnityEvent onClickButton;
        public void Init()
        {
            txt = GetComponentInChildren<TextMeshProUGUI>();
            button = GetComponent<UnityEngine.UI.Button>();
            rect = GetComponent<RectTransform>();
            image = GetComponent<Image>();
            button.navigation = new Navigation() { mode = Navigation.Mode.None };
            if (button != null)
            {
                button.onClick.AddListener(() =>
                {
                    if (selected) return;
                    selected = true;
                    onClickButton.Invoke();
                });
            }
        }

        /// <summary>
        /// 텍스트 길이에 따른 사이즈 변경
        /// </summary>
        /// <param name="text">Title Name</param>
        public void SetText(string text)
        {
            txt.text = text;
            rect.sizeDelta = new Vector2(txt.preferredWidth + Space, rect.sizeDelta.y);
        }

        /// <summary>
        /// 선택된 탭
        /// </summary>
        public void Select()
        {
            if (image == null) image = GetComponent<Image>();
            if (txt == null) txt = GetComponentInChildren<TextMeshProUGUI>();

            image.sprite = selectSprite;
            image.color = selectColor;

            selected = true;
        }

        /// <summary>
        /// 탭이 변경 될 경우
        /// </summary>
        public void Deselect()
        {
            if (image == null) image = GetComponent<Image>();
            if (txt == null) txt = GetComponentInChildren<TextMeshProUGUI>();

            image.sprite = normalSprite;
            image.color = normalColor;

            selected = false;
        }

        
        private void OnDestroy()
        {
            if (button != null) button.onClick.RemoveAllListeners();
            onClickButton.RemoveAllListeners();
        }

        public void OnPointerEnter(PointerEventData eventData)
        {
            image.sprite = selectSprite;
            image.color = HighLightColor;
        }

        public void OnPointerExit(PointerEventData eventData)
        {
            if (selected)
                image.color = selectColor;
            else
                image.sprite = normalSprite;
                image.color = normalColor;
        }

    }
}