using System;
using System.Globalization;
using System.Numerics;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;
using UnityEngine.UI;
using Vector2 = UnityEngine.Vector2;
using Vector3 = UnityEngine.Vector3;
using Vector4 = UnityEngine.Vector4;

// 코드로 만드는 uGUI 도우미 (기준 해상도 1080×1920 · 원작 GamePlayUI 좌표계와 같음)
namespace VS.View
{
    public static class Pal
    {
        public static readonly Color Ink = new Color32(44, 48, 80, 255);          // 남색 잉크(GUI Pro-SuperCasual 테두리 계열)
        public static readonly Color Navy = new Color32(38, 44, 72, 255);         // 어두운 판·탭 바
        public static readonly Color NavyLight = new Color32(78, 90, 136, 255);   // 선택된 탭
        public static readonly Color Outline = new Color(0.14f, 0.16f, 0.28f, 0.95f);
        public static readonly Color White = Color.white;
        public static readonly Color Pink = new Color32(255, 105, 170, 255);
        public static readonly Color PinkDark = new Color32(214, 62, 132, 255);
        public static readonly Color Purple = new Color32(126, 87, 214, 255);
        public static readonly Color PurpleDark = new Color32(84, 56, 160, 255);
        public static readonly Color Yellow = new Color32(255, 206, 64, 255);
        public static readonly Color Green = new Color32(78, 200, 120, 255);
        public static readonly Color GreenDark = new Color32(42, 150, 84, 255);
        public static readonly Color Gray = new Color32(170, 170, 185, 255);
        public static readonly Color Panel = new Color32(255, 255, 255, 255);
        public static readonly Color PanelEdge = new Color32(236, 240, 252, 255);
        public static readonly Color Row = new Color32(241, 243, 252, 255);       // 팝업 안 줄(행) 바탕
        public static readonly Color Dim = new Color(0.08f, 0.04f, 0.12f, 0.62f);
        public static readonly Color Blue = new Color32(84, 170, 255, 255);
        public static readonly Color Orange = new Color32(255, 150, 60, 255);
        public static readonly Color Red = new Color32(240, 72, 84, 255);
    }

    public static class Fmt
    {
        // NSHTool.Utilities.NumberShortFormatter (.cctor RVA 0x252D820) 접미사 표 그대로 · 소수점 = '.'(원작은 vi-VN ',')
        static readonly string[] Suf = { "", "k", "M", "B", "T", "Qa", "Qi", "Sx", "Sp", "Oc" };

        static decimal Trunc(decimal d, int n) { decimal p = 1m; for (int i = 0; i < n; i++) p *= 10m; return decimal.Truncate(d * p) / p; }

        public static string Num(BigInteger v, int decimals = 1)
        {
            if (v < 0) return "-" + Num(-v, decimals);
            if (v < 1000) return v.ToString(CultureInfo.InvariantCulture);
            int e = 0;
            BigInteger t = v;
            while (t >= 1000 && e < Suf.Length - 1) { t /= 1000; e++; }
            decimal d = (decimal)(v / BigInteger.Pow(1000, Math.Max(0, e - 1))) / 1000m;
            if (d >= 1000m && e == Suf.Length - 1) return t.ToString(CultureInfo.InvariantCulture) + Suf[e];
            decimal r = Trunc(d, decimals);
            return r.ToString("0." + new string('#', decimals), CultureInfo.InvariantCulture) + Suf[e];
        }

        public static string Num(decimal v, int decimals = 1)
        {
            if (v < 1000m)
            {
                if (v < 10m) return Trunc(v, 2).ToString("0.##", CultureInfo.InvariantCulture);
                return Trunc(v, 1).ToString("0.#", CultureInfo.InvariantCulture);
            }
            return Num(new BigInteger(decimal.Truncate(v)), decimals);
        }

        public static string Time(double sec)
        {
            if (sec < 0) sec = 0;
            int s = (int)Math.Ceiling(sec);
            if (s >= 3600) return $"{s / 3600}:{(s / 60) % 60:00}:{s % 60:00}";
            return $"{s / 60:00}:{s % 60:00}";
        }
    }

    public static class UI
    {
        static Font font;
        public static Font Font
        {
            get
            {
                if (font == null) font = Resources.Load<Font>("Fonts/MaplestoryBold");
                if (font == null) font = Resources.GetBuiltinResource<Font>("LegacyRuntime.ttf");
                return font;
            }
        }

        public static RectTransform Rect(string name, Transform parent)
        {
            var go = new GameObject(name, typeof(RectTransform));
            go.layer = 5;
            var rt = (RectTransform)go.transform;
            rt.SetParent(parent, false);
            return rt;
        }

        public static RectTransform Place(this RectTransform rt, Vector2 aMin, Vector2 aMax, Vector2 pos, Vector2 size, Vector2? pivot = null)
        {
            rt.anchorMin = aMin; rt.anchorMax = aMax; rt.pivot = pivot ?? new Vector2(0.5f, 0.5f);
            rt.anchoredPosition = pos; rt.sizeDelta = size;
            return rt;
        }

        public static RectTransform Fill(this RectTransform rt, float l = 0, float b = 0, float r = 0, float t = 0)
        {
            rt.anchorMin = Vector2.zero; rt.anchorMax = Vector2.one; rt.pivot = new Vector2(0.5f, 0.5f);
            rt.offsetMin = new Vector2(l, b); rt.offsetMax = new Vector2(-r, -t);
            return rt;
        }

        public static Image Img(Transform parent, string name, Sprite sp, Color c, bool raycast = false)
        {
            var rt = Rect(name, parent);
            var im = rt.gameObject.AddComponent<Image>();
            im.sprite = sp; im.color = c; im.raycastTarget = raycast;
            if (sp != null && sp.border != Vector4.zero) im.type = Image.Type.Sliced;
            return im;
        }

        public static Text Txt(Transform parent, string name, string s, int size, Color c, TextAnchor a = TextAnchor.MiddleCenter, bool outline = false)
        {
            var rt = Rect(name, parent);
            var t = rt.gameObject.AddComponent<Text>();
            t.font = Font; t.text = s; t.fontSize = size; t.color = c; t.alignment = a;
            t.raycastTarget = false; t.horizontalOverflow = HorizontalWrapMode.Wrap; t.verticalOverflow = VerticalWrapMode.Truncate;
            t.resizeTextForBestFit = true; t.resizeTextMinSize = Math.Max(10, size / 2); t.resizeTextMaxSize = size;
            if (outline) { var o = rt.gameObject.AddComponent<Outline>(); o.effectColor = Pal.Outline; float d = Mathf.Clamp(size / 15f, 1.5f, 3f); o.effectDistance = new Vector2(d, -d); }   // 작은 글자는 얇게
            return t;
        }

        /// 아이콘 그림 (비율 유지)
        public static Image Icon(Transform parent, string name, Sprite sp, Color c)
        {
            var im = Img(parent, name, sp, c);
            im.preserveAspect = true;
            return im;
        }

        public static Button Btn(Transform parent, string name, Sprite sp, Color c, UnityAction onClick)
        {
            var im = Img(parent, name, sp, c, true);
            var b = im.gameObject.AddComponent<Button>();
            var cb = b.colors; cb.pressedColor = new Color(0.85f, 0.85f, 0.85f); cb.disabledColor = new Color(0.62f, 0.62f, 0.66f, 1f); b.colors = cb;
            if (onClick != null) b.onClick.AddListener(onClick);
            im.gameObject.AddComponent<PressScale>();
            return b;
        }

        /// 글자 버튼 (배경 + 글자)
        /// 팩이 있으면 색이 구워진 버튼 그림(흰 틴트) · 없으면 둥근 판 + 색
        public static Button TextBtn(Transform parent, string name, string label, Color bg, int size, UnityAction onClick, out Text text)
        {
            var sp = Skin.Button(bg);
            var b = Btn(parent, name, sp ?? Art.Round, sp != null ? Color.white : bg, onClick);
            text = Txt(b.transform, "Label", label, size, Color.white, TextAnchor.MiddleCenter, true);
            text.rectTransform.Fill(10, sp != null ? 16 : 6, 10, 6);   // 팩 버튼은 아래 그림자 두께만큼 글자를 올림
            return b;
        }

        /// 버튼 색 바꾸기 (팩 = 그림 교체 · 코드 그림 = 색)
        public static void SetBtnColor(Button b, Color c)
        {
            var im = b.GetComponent<Image>();
            var sp = Skin.Button(c);
            if (sp != null) { im.sprite = sp; im.color = Color.white; } else { im.sprite = Art.Round; im.color = c; }
        }

        /// 가로 막대 — small = 유닛 체력 같은 작은 막대(테두리 얇은 그림)
        public static Image Bar(Transform parent, string name, Color bg, Color fg, out Image fill, bool small = false)
        {
            var back = Img(parent, name, small ? Skin.HpBg : Skin.BarBg, bg);
            fill = Img(back.transform, "Fill", small ? Skin.HpFill : Skin.BarFill, fg);
            fill.type = Image.Type.Filled; fill.fillMethod = Image.FillMethod.Horizontal; fill.fillAmount = 0;
            fill.preserveAspect = false;
            int pad = Skin.On ? (small ? 3 : 5) : 4;
            fill.rectTransform.Fill(pad, pad, pad, pad);
            return back;
        }

        /// 빨간 알림 점 (흰 테두리) — 오른쪽 위
        public static Image Dot(Transform parent, string name, float size = 36f)
        {
            var d = Img(parent, name, Skin.CirclePlain, Pal.Red);
            d.rectTransform.Place(new Vector2(1, 1), new Vector2(1, 1), new Vector2(-6, -6), new Vector2(size, size));
            if (Skin.DotBorder != null) Img(d.transform, "Border", Skin.DotBorder, Color.white).rectTransform.Fill(-3, -3, -3, -3);
            return d;
        }

        public static ScrollRect Scroll(Transform parent, string name, out RectTransform content, float spacing = 16f)
        {
            var root = Img(parent, name, Art.Square, new Color(1, 1, 1, 0), true);
            var sr = root.gameObject.AddComponent<ScrollRect>();
            var vp = Rect("Viewport", root.transform).Fill();
            vp.gameObject.AddComponent<RectMask2D>();
            content = Rect("Content", vp);
            content.anchorMin = new Vector2(0, 1); content.anchorMax = new Vector2(1, 1); content.pivot = new Vector2(0.5f, 1);
            content.anchoredPosition = Vector2.zero; content.sizeDelta = Vector2.zero;
            var vl = content.gameObject.AddComponent<VerticalLayoutGroup>();
            vl.spacing = spacing; vl.childControlHeight = true; vl.childControlWidth = true; vl.childForceExpandHeight = false; vl.childForceExpandWidth = true;
            vl.padding = new RectOffset(8, 8, 8, 24);
            var fit = content.gameObject.AddComponent<ContentSizeFitter>();
            fit.verticalFit = ContentSizeFitter.FitMode.PreferredSize;
            sr.viewport = vp; sr.content = content; sr.horizontal = false; sr.vertical = true;
            sr.movementType = ScrollRect.MovementType.Elastic; sr.scrollSensitivity = 30f;
            return sr;
        }

        public static void SetLayoutHeight(Component c, float h)
        {
            var le = c.GetComponent<LayoutElement>() ?? c.gameObject.AddComponent<LayoutElement>();
            le.preferredHeight = h; le.minHeight = h;
        }
    }

    /// 버튼 눌림 크기 반응
    public class PressScale : MonoBehaviour, IPointerDownHandler, IPointerUpHandler, IPointerExitHandler
    {
        Vector3 baseScale = Vector3.one; float target = 1f;
        void Awake() { baseScale = transform.localScale; }
        public void OnPointerDown(PointerEventData e) { target = 0.93f; }
        public void OnPointerUp(PointerEventData e) { target = 1f; }
        public void OnPointerExit(PointerEventData e) { target = 1f; }
        void Update()
        {
            float s = transform.localScale.x / Mathf.Max(0.0001f, baseScale.x);
            s = Mathf.MoveTowards(s, target, Time.unscaledDeltaTime * 2.5f);
            transform.localScale = baseScale * s;
        }
    }
}