using UnityEngine;
using UnityEngine.UI;

namespace Streamingle.Contents.BossRaid
{
    /// <summary>
    /// 보스 HP바 UI. 고전 RPG (포켓몬) 스타일.
    /// 얇고 긴 게이지 + 이름판 + HP 수치.
    /// </summary>
    public class BossHPBar : MonoBehaviour
    {
        #region Fields

        [Header("UI 참조 (자동 생성 가능)")]
        [SerializeField] private Canvas canvas;
        [SerializeField] private Image hpFill;
        [SerializeField] private Image hpDamageFill;
        [SerializeField] private Text bossNameText;
        [SerializeField] private Text hpText;
        [SerializeField] private Text hpValueText;

        [Header("설정")]
        [SerializeField] private float smoothSpeed = 5f;
        [SerializeField] private float damageShowDelay = 0.4f;
        [SerializeField] private float damageSmooth = 3f;

        [Header("색상")]
        [SerializeField] private Color hpColorHigh = new Color(0.18f, 0.82f, 0.28f);
        [SerializeField] private Color hpColorMid = new Color(0.95f, 0.78f, 0.1f);
        [SerializeField] private Color hpColorLow = new Color(0.92f, 0.2f, 0.15f);
        [SerializeField] private Color damageTrailColor = new Color(0.9f, 0.35f, 0.1f, 0.9f);

        private float _targetRatio = 1f;
        private float _currentDisplayRatio = 1f;
        private float _damageDisplayRatio = 1f;
        private float _damageTimer;
        private bool _isVisible;
        private Font _font;

        private RectTransform _hpFillRect;
        private RectTransform _dmgFillRect;
        private int _maxHP;

        // 프레임 색상 (고전 RPG 도트 느낌)
        private static readonly Color FrameOuter = new Color(0.12f, 0.12f, 0.18f, 1f);
        private static readonly Color FrameInner = new Color(0.35f, 0.35f, 0.42f, 1f);
        private static readonly Color FrameHighlight = new Color(0.55f, 0.55f, 0.65f, 0.5f);
        private static readonly Color NameplateBG = new Color(0.08f, 0.08f, 0.15f, 0.92f);
        private static readonly Color GaugeBG = new Color(0.02f, 0.02f, 0.05f, 1f);

        #endregion

        #region Unity Messages

        private void Awake()
        {
            _font = BossRaidFontLoader.Load();

            if (canvas == null || hpFill == null)
                CreateUI();

            Hide();
        }

        private void Update()
        {
            if (!_isVisible) return;

            _currentDisplayRatio = Mathf.Lerp(_currentDisplayRatio, _targetRatio, Time.deltaTime * smoothSpeed);
            SetFillWidth(_hpFillRect, _currentDisplayRatio);
            hpFill.color = GetHPColor(_currentDisplayRatio);

            _damageTimer -= Time.deltaTime;
            if (_damageTimer <= 0f)
                _damageDisplayRatio = Mathf.Lerp(_damageDisplayRatio, _currentDisplayRatio, Time.deltaTime * damageSmooth);
            SetFillWidth(_dmgFillRect, _damageDisplayRatio);

            if (hpText != null)
            {
                int displayPercent = Mathf.RoundToInt(_currentDisplayRatio * 100f);
                hpText.text = $"{displayPercent}%";
            }

            if (hpValueText != null)
            {
                int displayHP = Mathf.RoundToInt(_currentDisplayRatio * _maxHP);
                hpValueText.text = $"{displayHP} / {_maxHP}";
            }
        }

        #endregion

        #region Public Methods

        public void Show(string bossName, float hpRatio = 1f, int maxHP = 0)
        {
            _isVisible = true;
            _targetRatio = hpRatio;
            _currentDisplayRatio = hpRatio;
            _damageDisplayRatio = hpRatio;
            _maxHP = maxHP;

            if (bossNameText != null)
                bossNameText.text = bossName;

            if (canvas != null)
                canvas.gameObject.SetActive(true);
        }

        public void Hide()
        {
            _isVisible = false;
            if (canvas != null)
                canvas.gameObject.SetActive(false);
        }

        public void SetHP(float ratio, int currentHP = -1, int maxHP = -1)
        {
            _targetRatio = Mathf.Clamp01(ratio);
            _damageTimer = damageShowDelay;
            if (maxHP > 0) _maxHP = maxHP;
        }

        #endregion

        #region Private Methods

        private void SetFillWidth(RectTransform rect, float ratio)
        {
            if (rect == null) return;
            rect.anchorMax = new Vector2(Mathf.Clamp01(ratio), rect.anchorMax.y);
        }

        private Color GetHPColor(float ratio)
        {
            if (ratio > 0.5f)
                return Color.Lerp(hpColorMid, hpColorHigh, (ratio - 0.5f) * 2f);
            else
                return Color.Lerp(hpColorLow, hpColorMid, ratio * 2f);
        }

        private void CreateUI()
        {
            // ━━━ Canvas ━━━
            var canvasObj = new GameObject("BossRaid_HPBar");
            canvasObj.transform.SetParent(transform);
            canvas = canvasObj.AddComponent<Canvas>();
            canvas.renderMode = RenderMode.ScreenSpaceOverlay;
            canvas.sortingOrder = 100;
            var scaler = canvasObj.AddComponent<CanvasScaler>();
            scaler.uiScaleMode = CanvasScaler.ScaleMode.ScaleWithScreenSize;
            scaler.referenceResolution = new Vector2(1920, 1080);

            // ━━━ 상단 영역 전체 ━━━
            var topArea = R("TopArea", canvasObj.transform,
                new Vector2(0.1f, 0.92f), new Vector2(0.9f, 0.98f));

            // ━━━ 이름판 (왼쪽 탭 형태) ━━━
            // 외곽
            var nameOuter = R("NameOuter", topArea,
                new Vector2(0f, 0f), new Vector2(0.22f, 1f));
            Img(nameOuter, FrameOuter);

            // 내부
            var nameInner = R("NameInner", nameOuter,
                new Vector2(0f, 0f), new Vector2(1f, 1f),
                new Vector2(2f, 2f), new Vector2(-2f, -2f));
            Img(nameInner, NameplateBG);

            // 이름 텍스트
            var nameTextR = R("NameText", nameInner,
                new Vector2(0f, 0f), new Vector2(1f, 1f),
                new Vector2(8f, 0f), new Vector2(-4f, 0f));
            bossNameText = AddText(nameTextR.gameObject, "BOSS", 20, Color.white, TextAnchor.MiddleLeft, FontStyle.Bold);

            // ━━━ HP 게이지 영역 (이름판 오른쪽 ~ 끝) ━━━
            // 외곽 프레임 (3중 테두리 — 도트 RPG 느낌)
            var gaugeOuter = R("GaugeOuter", topArea,
                new Vector2(0.22f, 0f), new Vector2(1f, 1f),
                new Vector2(-1f, 0f), Vector2.zero);
            Img(gaugeOuter, FrameOuter);

            // 중간 프레임
            var gaugeMid = R("GaugeMid", gaugeOuter,
                Vector2.zero, Vector2.one,
                new Vector2(2f, 2f), new Vector2(-2f, -2f));
            Img(gaugeMid, FrameInner);

            // 내부 프레임
            var gaugeInner = R("GaugeInner", gaugeMid,
                Vector2.zero, Vector2.one,
                new Vector2(2f, 2f), new Vector2(-2f, -2f));
            Img(gaugeInner, FrameOuter);

            // 게이지 배경 (검정)
            var gaugeBG = R("GaugeBG", gaugeInner,
                Vector2.zero, Vector2.one,
                new Vector2(2f, 2f), new Vector2(-2f, -2f));
            Img(gaugeBG, GaugeBG);

            // ━━━ 데미지 트레일 ━━━
            var dmgRect = R("DmgFill", gaugeBG, Vector2.zero, Vector2.one);
            hpDamageFill = Img(dmgRect, damageTrailColor);
            _dmgFillRect = dmgRect;

            // ━━━ HP Fill ━━━
            var fillRect = R("HPFill", gaugeBG, Vector2.zero, Vector2.one);
            hpFill = Img(fillRect, hpColorHigh);
            _hpFillRect = fillRect;

            // ━━━ 하이라이트 (게이지 위쪽 밝은 줄) ━━━
            var hlRect = R("Highlight", fillRect,
                new Vector2(0f, 0.55f), new Vector2(1f, 0.9f),
                new Vector2(1f, 0f), new Vector2(-1f, 0f));
            Img(hlRect, new Color(1f, 1f, 1f, 0.18f));

            // ━━━ 하단 그림자 (게이지 아래쪽 어두운 줄) ━━━
            var shRect = R("Shadow", fillRect,
                new Vector2(0f, 0.05f), new Vector2(1f, 0.3f),
                new Vector2(1f, 0f), new Vector2(-1f, 0f));
            Img(shRect, new Color(0f, 0f, 0f, 0.2f));

            // ━━━ 프레임 위 하이라이트 라인 (상단 엣지) ━━━
            var topLineRect = R("TopLine", gaugeMid,
                new Vector2(0f, 0.85f), new Vector2(1f, 1f),
                new Vector2(2f, 0f), new Vector2(-2f, 0f));
            Img(topLineRect, FrameHighlight);

            // ━━━ HP % 텍스트 (게이지 중앙) ━━━
            var pctRect = R("HPPercent", gaugeOuter,
                Vector2.zero, Vector2.one,
                new Vector2(4f, 0f), new Vector2(-4f, 0f));
            hpText = AddText(pctRect.gameObject, "100%", 18, Color.white, TextAnchor.MiddleCenter, FontStyle.Bold);

            // ━━━ HP 수치 (게이지 오른쪽 바깥) ━━━
            var valRect = R("HPValue", topArea,
                new Vector2(0.82f, -0.6f), new Vector2(1f, 0f),
                Vector2.zero, new Vector2(-4f, 0f));
            hpValueText = AddText(valRect.gameObject, "1000 / 1000", 14,
                new Color(0.7f, 0.7f, 0.75f), TextAnchor.MiddleRight, FontStyle.Normal);
        }

        // ── 유틸 ──

        private RectTransform R(string name, Transform parent,
            Vector2 anchorMin, Vector2 anchorMax,
            Vector2? offsetMin = null, Vector2? offsetMax = null)
        {
            var obj = new GameObject(name);
            obj.transform.SetParent(parent, false);
            var rt = obj.AddComponent<RectTransform>();
            rt.anchorMin = anchorMin;
            rt.anchorMax = anchorMax;
            rt.offsetMin = offsetMin ?? Vector2.zero;
            rt.offsetMax = offsetMax ?? Vector2.zero;
            return rt;
        }

        private Image Img(RectTransform rt, Color color)
        {
            var img = rt.gameObject.AddComponent<Image>();
            img.color = color;
            img.raycastTarget = false;
            return img;
        }

        private Text AddText(GameObject go, string content, int fontSize, Color color, TextAnchor anchor, FontStyle style)
        {
            var text = go.AddComponent<Text>();
            text.text = content;
            text.fontSize = fontSize;
            text.color = color;
            text.alignment = anchor;
            text.fontStyle = style;
            text.raycastTarget = false;
            if (_font != null) text.font = _font;

            var outline = go.AddComponent<Outline>();
            outline.effectColor = new Color(0f, 0f, 0f, 0.95f);
            outline.effectDistance = new Vector2(1f, -1f);

            return text;
        }

        #endregion
    }
}