using System.Collections;
using TMPro;
using UnityEngine;
using UVC.Core;

namespace UVC.UI.Modal
{
    public class Toast : SingletonApp<Toast>
    {
        protected static string prefabPath = "Prefabs/UI/Modal/Toast";
        protected static GameObject prefab;
        protected static Toast toast;


        public static void Show(string message, float duration = 3f, float fadeInOutTime = 0.25f)
        {
            if (prefab == null) prefab = Resources.Load(prefabPath, typeof(GameObject)) as GameObject;
            if (prefab != null && toast == null)
            {
                GameObject go = UnityEngine.Object.Instantiate(prefab);
                toast = go.GetComponent<Toast>();
                toast.change(0);
            }
            if (toast != null)
            {
                toast.gameObject.SetActive(true);
                var canvass = GameObject.FindObjectsByType<Canvas>(FindObjectsSortMode.None);
                Canvas canvas = null;
                foreach (var c in canvass)
                {
                    if (c.tag == "ModalCanvas")
                    {
                        canvas = c;
                        toast.transform.SetParent(canvas.transform);
                        toast.show(message, duration, fadeInOutTime);
                        break;
                    }
                }
            }
        }

        protected CanvasGroup canvasGroup;
        protected TextMeshProUGUI txt;

        protected void show(string message, float duration = 3, float fadeInOutTime = 0.25f)
        {
            StopAllCoroutines();
            StartCoroutine(showCoroutine(message, duration, fadeInOutTime));
        }

        protected IEnumerator showCoroutine(string message, float duration = 3, float fadeInOutTime = 0.25f)
        {
            if (txt == null) txt = GetComponentInChildren<TextMeshProUGUI>();
            fitTextWidth(GetComponent<RectTransform>(), txt, message);

            yield return fadeInOut(fadeInOutTime, true);
            change(1);
            float elapsedTime = 0.0f;
            while (elapsedTime < duration)
            {
                elapsedTime += Time.deltaTime;
                yield return null;
            }

            yield return fadeInOut(fadeInOutTime, false);
            change(0);
            transform.SetParent(null);
            gameObject.SetActive(true);
        }


        protected IEnumerator fadeInOut(float durationTime, bool inOut)
        {
            float start = 0.0f;
            float end = 1.0f;
            if (!inOut)
            {
                start = 1.0f;
                end = 0.0f;
            }

            float elapsedTime = 0.0f;

            while (elapsedTime < durationTime)
            {
                float alpha = Mathf.Lerp(start, end, elapsedTime / durationTime);

                change(alpha);

                elapsedTime += Time.deltaTime;

                yield return null;
            }
        }

        protected void change(float alpha)
        {
            if (canvasGroup == null) canvasGroup = GetComponent<CanvasGroup>();
            canvasGroup.alpha = alpha;
        }

        private void fitTextWidth(RectTransform rect, TextMeshProUGUI text, string textValue)
        {
            text.text = textValue;

            Vector2 rectSize = rect.sizeDelta;
            rectSize.x = text.preferredWidth + 20;
            rect.sizeDelta = rectSize;
            rect.anchoredPosition = new Vector2(0, rectSize.y + 10);


        }

    }
}