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

namespace Streamingle.Contents.BossRaid
{
    /// <summary>
    /// GAME OVER 화면. 유저 HP 0 시 표시됩니다.
    /// </summary>
    public class GameOverScreen : MonoBehaviour
    {
        #region Fields

        [Header("비주얼")]
        [SerializeField] private Color titleColor = new Color(0.9f, 0.15f, 0.1f);
        [SerializeField] private Color bgColor = new Color(0f, 0f, 0f, 0.6f);

        private Canvas _canvas;
        private CanvasGroup _canvasGroup;
        private Text _titleText;
        private Coroutine _showCoroutine;
        private Font _font;

        #endregion

        #region Unity Messages

        private void Awake()
        {
            _font = BossRaidFontLoader.Load();
            CreateUI();
            _canvasGroup.alpha = 0f;
        }

        #endregion

        #region Public Methods

        public void Show()
        {
            if (_showCoroutine != null) StopCoroutine(_showCoroutine);
            _showCoroutine = StartCoroutine(ShowCoroutine());
        }

        public void Hide()
        {
            if (_showCoroutine != null)
            {
                StopCoroutine(_showCoroutine);
                _showCoroutine = null;
            }
            _canvasGroup.alpha = 0f;
        }

        #endregion

        #region Private Methods

        private IEnumerator ShowCoroutine()
        {
            _titleText.text = "";
            _canvasGroup.alpha = 0f;

            // 페이드 인
            float elapsed = 0f;
            while (elapsed < 0.5f)
            {
                elapsed += Time.deltaTime;
                _canvasGroup.alpha = elapsed / 0.5f;
                yield return null;
            }
            _canvasGroup.alpha = 1f;

            // 텍스트 등장 (펀치 스케일)
            _titleText.text = "GAME OVER";
            var rect = _titleText.rectTransform;
            rect.localScale = Vector3.one * 2f;

            elapsed = 0f;
            while (elapsed < 0.4f)
            {
                elapsed += Time.deltaTime;
                float t = elapsed / 0.4f;
                float ease = 1f + 2.7f * Mathf.Pow(t - 1f, 3f) + 1.7f * Mathf.Pow(t - 1f, 2f);
                rect.localScale = Vector3.one * Mathf.LerpUnclamped(2f, 1f, ease);
                yield return null;
            }
            rect.localScale = Vector3.one;
        }

        private void CreateUI()
        {
            var canvasObj = new GameObject("BossRaid_GameOver");
            canvasObj.transform.SetParent(transform);
            _canvas = canvasObj.AddComponent<Canvas>();
            _canvas.renderMode = RenderMode.ScreenSpaceOverlay;
            _canvas.sortingOrder = 201;
            _canvasGroup = canvasObj.AddComponent<CanvasGroup>();
            _canvasGroup.interactable = false;
            _canvasGroup.blocksRaycasts = false;
            var scaler = canvasObj.AddComponent<CanvasScaler>();
            scaler.uiScaleMode = CanvasScaler.ScaleMode.ScaleWithScreenSize;
            scaler.referenceResolution = new Vector2(1920, 1080);

            // 배경
            var bgObj = new GameObject("BG");
            bgObj.transform.SetParent(canvasObj.transform, false);
            var bgRect = bgObj.AddComponent<RectTransform>();
            bgRect.anchorMin = Vector2.zero;
            bgRect.anchorMax = Vector2.one;
            bgRect.offsetMin = Vector2.zero;
            bgRect.offsetMax = Vector2.zero;
            var bgImg = bgObj.AddComponent<Image>();
            bgImg.color = bgColor;
            bgImg.raycastTarget = false;

            // 타이틀
            var titleObj = new GameObject("Title");
            titleObj.transform.SetParent(canvasObj.transform, false);
            var titleRect = titleObj.AddComponent<RectTransform>();
            titleRect.anchorMin = new Vector2(0.1f, 0.3f);
            titleRect.anchorMax = new Vector2(0.9f, 0.7f);
            titleRect.offsetMin = Vector2.zero;
            titleRect.offsetMax = Vector2.zero;
            _titleText = titleObj.AddComponent<Text>();
            _titleText.fontSize = 90;
            _titleText.color = titleColor;
            _titleText.alignment = TextAnchor.MiddleCenter;
            _titleText.fontStyle = FontStyle.Bold;
            _titleText.raycastTarget = false;
            if (_font != null) _titleText.font = _font;
            var outline = titleObj.AddComponent<Outline>();
            outline.effectColor = Color.black;
            outline.effectDistance = new Vector2(3f, -3f);
        }

        #endregion
    }
}