using System.Collections.Generic;
using System.IO;
using System.Text;
using UnityEditor;
using UnityEngine;

namespace TKS.EditorTools
{
    /// <summary>
    /// UI 테마 임포트(PD #1100) — Assets/Data/UI/ui_theme.csv(SOT) → Assets/Resources/UI/UITheme.asset.
    /// 경로 = 팩 Components 기준 상대 경로(Assets/ 로 시작하면 그대로) · 오류가 있으면 자산을 바꾸지 않는다.
    /// 신규 제작 납품(Assets/UI/Samguk/**/&lt;id&gt;.png)은 같은 id 의 스킨·아이콘을 치환하고 표에 없는 id 는 아이콘으로 추가한다(코드 변경 없이 교체).
    /// </summary>
    public static class UIThemeImporter
    {
        public const string CsvPath = "Assets/Data/UI/ui_theme.csv";
        public const string AssetPath = "Assets/Resources/UI/UITheme.asset";
        public const string PackRoot = "Assets/UI/GUIPro/ResourcesData/Sprites/Components/";
        public const string SamgukRoot = "Assets/UI/Samguk";

        [MenuItem("TKS/Import UI Theme (UI 테마 임포트)")]
        public static void Menu()
        {
            Import();
        }

        public static bool Import()
        {
            var errors = new List<string>();
            var theme = ScriptableObject.CreateInstance<UITheme>();
            if (!File.Exists(CsvPath))
            {
                Debug.LogError("[TKS] UI 테마 표 없음: " + CsvPath);
                return false;
            }
            var lines = File.ReadAllText(CsvPath, Encoding.UTF8).TrimStart('').Replace("\r", "").Split('\n');
            for (int n = 1; n < lines.Length; n++)
            {
                var line = lines[n];
                if (string.IsNullOrWhiteSpace(line)) continue;
                var f = line.Split(',');
                if (f.Length < 8)
                {
                    errors.Add((n + 1) + "행: 열 부족");
                    continue;
                }
                string kind = f[0].Trim(), id = f[1].Trim(), path = f[2].Trim(), overlay = f[3].Trim(), color = f[7].Trim();
                switch (kind)
                {
                    case "color":
                    {
                        Color c;
                        if (!ColorUtility.TryParseHtmlString(color, out c)) errors.Add((n + 1) + "행 " + id + ": 색 형식 " + color);
                        else theme.colors.Add(new UITheme.ColorEntry { id = id, color = c });
                        break;
                    }
                    case "skin":
                    {
                        var s = new UITheme.SkinEntry { id = id, pack = LoadSprite(path, n, errors) };
                        if (overlay.Length > 0) s.overlay = LoadSprite(overlay, n, errors);
                        s.ppu = ParseF(f[4], 1f);
                        s.inset = ParseInset(f[5]);
                        s.overlayAlpha = ParseF(f[6], 1f);
                        theme.skins.Add(s);
                        break;
                    }
                    case "icon":
                    {
                        var e = new UITheme.IconEntry { id = id, pack = LoadSprite(path, n, errors) };
                        Color c;
                        if (color.Length > 0 && ColorUtility.TryParseHtmlString(color, out c)) e.tint = c;
                        theme.icons.Add(e);
                        break;
                    }
                    case "font":
                        if (id == "title")
                        {
                            theme.titleFont = AssetDatabase.LoadAssetAtPath<Font>(path);
                            if (theme.titleFont == null) errors.Add((n + 1) + "행: 폰트 없음 " + path);
                        }
                        break;
                    default:
                        errors.Add((n + 1) + "행: 알 수 없는 kind " + kind);
                        break;
                }
            }
            if (errors.Count > 0)
            {
                foreach (var e in errors) Debug.LogError("[TKS] UI 테마 표 오류 · " + e);
                Debug.LogError("[TKS] UI 테마 임포트 중단(오류 " + errors.Count + ") · 자산 변경 없음");
                Object.DestroyImmediate(theme);
                return false;
            }

            // 신규 제작 치환(파일 이름 = id)
            var samguk = SamgukSprites();
            int replaced = 0, added = 0;
            var used = new HashSet<string>();
            foreach (var s in theme.skins)
            {
                Sprite sp;
                if (samguk.TryGetValue(s.id, out sp))
                {
                    s.samguk = sp;
                    used.Add(s.id);
                    replaced++;
                }
            }
            foreach (var e in theme.icons)
            {
                Sprite sp;
                if (samguk.TryGetValue(e.id, out sp))
                {
                    e.samguk = sp;
                    used.Add(e.id);
                    replaced++;
                }
            }
            foreach (var kv in samguk)
            {
                if (used.Contains(kv.Key)) continue;
                theme.icons.Add(new UITheme.IconEntry { id = kv.Key, samguk = kv.Value });
                added++;
            }

            if (!AssetDatabase.IsValidFolder("Assets/Resources")) AssetDatabase.CreateFolder("Assets", "Resources");
            if (!AssetDatabase.IsValidFolder("Assets/Resources/UI")) AssetDatabase.CreateFolder("Assets/Resources", "UI");
            var asset = AssetDatabase.LoadAssetAtPath<UITheme>(AssetPath);
            if (asset == null)
            {
                AssetDatabase.CreateAsset(theme, AssetPath);
                asset = theme;
            }
            else
            {
                EditorUtility.CopySerialized(theme, asset);
                Object.DestroyImmediate(theme);
            }
            asset.Rebuild();
            EditorUtility.SetDirty(asset);
            AssetDatabase.SaveAssets();
            UITheme.Use(asset);
            Debug.Log("[TKS] UI 테마 임포트 · 색 " + asset.colors.Count + " · 스킨 " + asset.skins.Count + " · 아이콘 " + asset.icons.Count +
                      " · 신규 제작 치환 " + replaced + " · 추가 " + added + " → " + AssetPath);
            // 테마가 쓰는 스프라이트 = UI 아틀라스 구성(PD 2026-11-10 · 새 스프라이트도 자동으로 묶임 · 구성이 같으면 그대로)
            UIAtlasBuilder.Build(asset);
            return true;
        }

        /// <summary>Assets/UI/Samguk/**/&lt;id&gt;.png → 스프라이트(같은 id 가 둘이면 경로 순 마지막).</summary>
        public static Dictionary<string, Sprite> SamgukSprites()
        {
            var map = new Dictionary<string, Sprite>();
            if (!AssetDatabase.IsValidFolder(SamgukRoot)) return map;
            var guids = AssetDatabase.FindAssets("t:Sprite", new[] { SamgukRoot });
            var paths = new List<string>();
            foreach (var g in guids) paths.Add(AssetDatabase.GUIDToAssetPath(g));
            paths.Sort(System.StringComparer.Ordinal);
            foreach (var p in paths)
            {
                var sp = AssetDatabase.LoadAssetAtPath<Sprite>(p);
                if (sp != null) map[Path.GetFileNameWithoutExtension(p)] = sp;
            }
            return map;
        }

        static Sprite LoadSprite(string path, int n, List<string> errors)
        {
            if (string.IsNullOrEmpty(path))
            {
                errors.Add((n + 1) + "행: 경로 없음");
                return null;
            }
            string full = path.StartsWith("Assets/") ? path : PackRoot + path;
            var sp = AssetDatabase.LoadAssetAtPath<Sprite>(full);
            if (sp == null) errors.Add((n + 1) + "행: 스프라이트 없음 " + full);
            return sp;
        }

        static float ParseF(string s, float def)
        {
            float v;
            return float.TryParse(s.Trim(), System.Globalization.NumberStyles.Float, System.Globalization.CultureInfo.InvariantCulture, out v) ? v : def;
        }

        static Vector4 ParseInset(string s)
        {
            s = s.Trim();
            if (s.Length == 0) return Vector4.zero;
            var p = s.Split(';');
            if (p.Length == 1)
            {
                float v = ParseF(p[0], 0f);
                return new Vector4(v, v, v, v);
            }
            return new Vector4(ParseF(p[0], 0f), p.Length > 1 ? ParseF(p[1], 0f) : 0f, p.Length > 2 ? ParseF(p[2], 0f) : 0f, p.Length > 3 ? ParseF(p[3], 0f) : 0f);
        }
    }

    /// <summary>신규 제작 UI(Assets/UI/Samguk) · 로비 배경(Assets/UI/Lobby) 임포트 설정 = Sprite(2D) · 납품 파일이 들어오면 테마 치환 테이블 자동 갱신.</summary>
    public class UIThemeAssetPostprocessor : AssetPostprocessor
    {
        static bool pending;

        static bool Ours(string path)
        {
            return path.StartsWith(UIThemeImporter.SamgukRoot + "/") || path.StartsWith("Assets/UI/Lobby/") || path.StartsWith("Assets/UI/Symbols/"); // Symbols = 병과 단색 심볼(Tools/class_symbols.py · PD 2026-11-09)
        }

        void OnPreprocessTexture()
        {
            if (!Ours(assetPath)) return;
            var ti = (TextureImporter)assetImporter;
            ti.textureType = TextureImporterType.Sprite;
            ti.spriteImportMode = SpriteImportMode.Single;
            ti.alphaIsTransparency = true;
            ti.mipmapEnabled = false;
            ti.spritePixelsPerUnit = 100f;
            ti.maxTextureSize = assetPath.StartsWith("Assets/UI/Lobby/") ? 2048 : 1024;
        }

        static void OnPostprocessAllAssets(string[] imported, string[] deleted, string[] moved, string[] movedFrom)
        {
            bool hit = false;
            foreach (var p in imported) hit |= p.StartsWith(UIThemeImporter.SamgukRoot + "/") && p.EndsWith(".png");
            foreach (var p in deleted) hit |= p.StartsWith(UIThemeImporter.SamgukRoot + "/") && p.EndsWith(".png");
            if (!hit || pending) return;
            pending = true;
            EditorApplication.delayCall += () =>
            {
                pending = false;
                UIThemeImporter.Import();
            };
        }
    }
}