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

namespace Streamingle.Contents.BossRaid
{
    /// <summary>
    /// 콤보 카운터 UI. 컴팩트 디자인, 오른쪽 수직 중앙.
    /// 히트 시 슬라이드 인 + 펀치 스케일, 타임아웃 시 슬라이드 아웃.
    /// </summary>
    public class ComboCounter : MonoBehaviour
    {
        #region Fields

        [Header("설정")]
        [SerializeField] private float comboTimeout = 2f;

        [Header("비주얼")]
        [SerializeField] private Color comboColor = new Color(1f, 0.85f, 0.15f);
        [SerializeField] private Color labelColor = new Color(0.85f, 0.85f, 0.9f);
        [SerializeField] private int baseFontSize = 80;
        [SerializeField] private int maxFontSize = 120;
        [SerializeField] private int fontSizeGrowPerHit = 1;

        private Canvas _canvas;
        private CanvasGroup _canvasGroup;
        private Text _comboText;
        private Text _hitLabel;
        private RectTransform _rootRect;

        private int _currentCombo;
        private float _lastHitTime;
        private Coroutine _punchCoroutine;
        private Coroutine _slideCoroutine;
        private Font _font;
        private bool _isShowing;

        // 슬라이드 위치 (화면 오른쪽 밖 → 안)
        private const float OffScreenX = 120f;
        private const float OnScreenX = -40f;

        #endregion

        #region Properties

        public int CurrentCombo => _currentCombo;

        #endregion

        #region Unity Messages

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

        private void Update()
        {
            if (_currentCombo <= 0) return;

            if (Time.time - _lastHitTime > comboTimeout)
                SlideOut();
        }

        #endregion

        #region Public Methods

        public void RegisterHit()
        {
            _currentCombo++;
            _lastHitTime = Time.time;
            UpdateDisplay();

            // 슬라이드 인 (처음이거나 숨겨진 상태일 때)
            if (!_isShowing)
                SlideIn();

            // 펀치 스케일
            if (_punchCoroutine != null) StopCoroutine(_punchCoroutine);
            _punchCoroutine = StartCoroutine(PunchCoroutine());
        }

        public void ResetCombo()
        {
            _currentCombo = 0;
            _isShowing = false;
            if (_canvasGroup != null) _canvasGroup.alpha = 0f;
        }

        public void Hide()
        {
            ResetCombo();
        }

        #endregion

        #region Private Methods

        private void UpdateDisplay()
        {
            _comboText.text = _currentCombo.ToString();
            _comboText.fontSize = Mathf.Min(baseFontSize + _currentCombo * fontSizeGrowPerHit, maxFontSize);
        }

        private void SlideIn()
        {
            if (_slideCoroutine != null) StopCoroutine(_slideCoroutine);
            _slideCoroutine = StartCoroutine(SlideCoroutine(OffScreenX, OnScreenX, 0f, 1f, 0.2f));
            _isShowing = true;
        }

        private void SlideOut()
        {
            if (!_isShowing) return;
            if (_slideCoroutine != null) StopCoroutine(_slideCoroutine);
            _slideCoroutine = StartCoroutine(SlideOutAndReset());
        }

        private IEnumerator SlideCoroutine(float fromX, float toX, float fromAlpha, float toAlpha, float duration)
        {
            float elapsed = 0f;
            while (elapsed < duration)
            {
                elapsed += Time.deltaTime;
                float t = elapsed / duration;
                float ease = 1f - (1f - t) * (1f - t); // EaseOutQuad
                _rootRect.anchoredPosition = new Vector2(Mathf.Lerp(fromX, toX, ease), _rootRect.anchoredPosition.y);
                _canvasGroup.alpha = Mathf.Lerp(fromAlpha, toAlpha, ease);
                yield return null;
            }
            _rootRect.anchoredPosition = new Vector2(toX, _rootRect.anchoredPosition.y);
            _canvasGroup.alpha = toAlpha;
            _slideCoroutine = null;
        }

        private IEnumerator SlideOutAndReset()
        {
            yield return SlideCoroutine(OnScreenX, OffScreenX, 1f, 0f, 0.3f);
            _currentCombo = 0;
            _isShowing = false;
        }

        private IEnumerator PunchCoroutine()
        {
            var rect = _comboText.rectTransform;
            float punchSize = 1.4f;
            float duration = 0.12f;
            float elapsed = 0f;

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

        private void CreateUI()
        {
            var canvasObj = new GameObject("BossRaid_ComboCounter");
            canvasObj.transform.SetParent(transform);
            _canvas = canvasObj.AddComponent<Canvas>();
            _canvas.renderMode = RenderMode.ScreenSpaceOverlay;
            _canvas.sortingOrder = 101;
            _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);

            // 루트 (오른쪽 수직 중앙, 피벗 오른쪽)
            var rootObj = new GameObject("ComboRoot");
            rootObj.transform.SetParent(canvasObj.transform, false);
            _rootRect = rootObj.AddComponent<RectTransform>();
            _rootRect.anchorMin = new Vector2(1f, 0.5f);
            _rootRect.anchorMax = new Vector2(1f, 0.5f);
            _rootRect.pivot = new Vector2(1f, 0.5f);
            _rootRect.sizeDelta = new Vector2(160f, 110f);
            _rootRect.anchoredPosition = new Vector2(OffScreenX, 0f);

            // 콤보 숫자
            var comboObj = new GameObject("ComboNumber");
            comboObj.transform.SetParent(rootObj.transform, false);
            var comboRect = comboObj.AddComponent<RectTransform>();
            comboRect.anchorMin = new Vector2(0f, 0.25f);
            comboRect.anchorMax = Vector2.one;
            comboRect.offsetMin = Vector2.zero;
            comboRect.offsetMax = Vector2.zero;
            _comboText = comboObj.AddComponent<Text>();
            _comboText.text = "0";
            _comboText.fontSize = baseFontSize;
            _comboText.color = comboColor;
            _comboText.alignment = TextAnchor.MiddleCenter;
            _comboText.fontStyle = FontStyle.Bold;
            _comboText.horizontalOverflow = HorizontalWrapMode.Overflow;
            _comboText.raycastTarget = false;
            if (_font != null) _comboText.font = _font;
            var outline = comboObj.AddComponent<Outline>();
            outline.effectColor = new Color(0.15f, 0.1f, 0f, 1f);
            outline.effectDistance = new Vector2(2f, -2f);

            // "COMBO" 라벨
            var labelObj = new GameObject("ComboLabel");
            labelObj.transform.SetParent(rootObj.transform, false);
            var labelRect = labelObj.AddComponent<RectTransform>();
            labelRect.anchorMin = Vector2.zero;
            labelRect.anchorMax = new Vector2(1f, 0.3f);
            labelRect.offsetMin = Vector2.zero;
            labelRect.offsetMax = Vector2.zero;
            _hitLabel = labelObj.AddComponent<Text>();
            _hitLabel.text = "COMBO";
            _hitLabel.fontSize = 16;
            _hitLabel.color = labelColor;
            _hitLabel.alignment = TextAnchor.MiddleCenter;
            _hitLabel.raycastTarget = false;
            if (_font != null) _hitLabel.font = _font;
            var labelOutline = labelObj.AddComponent<Outline>();
            labelOutline.effectColor = new Color(0f, 0f, 0f, 0.9f);
            labelOutline.effectDistance = new Vector2(1f, -1f);
        }

        #endregion
    }
}