using System.IO;
using System;
using System.Reflection;
using UnityEditor;
using UnityEngine;
using UnityEngine.TextCore.LowLevel;
using Object = UnityEngine.Object;

public static class XWorldUIFontInstaller
{
    private const string SourceFontPath = "Assets/Game/Art/UI/Font/siyuan_CN_Bold.otf";
    private const string TmpFontAssetPath = "Assets/Game/Art/UI/Font/siyuan_CN_Bold SDF.asset";
    private const string TmpSettingsPath = "Assets/TextMesh Pro/Resources/TMP Settings.asset";
    private static bool s_IsInstalling;

    [InitializeOnLoadMethod]
    private static void InstallDefaultFontOnLoad()
    {
        EditorApplication.delayCall += () =>
        {
            if (!File.Exists(SourceFontPath))
                return;

            InstallDefaultFont();
        };
    }

    [MenuItem("XWorld/UI/Install Default Font", false, 702)]
    public static void InstallDefaultFont()
    {
        if (s_IsInstalling)
            return;

        s_IsInstalling = true;
        try
        {
            AssetDatabase.ImportAsset(SourceFontPath, ImportAssetOptions.ForceUpdate);

            Font sourceFont = AssetDatabase.LoadAssetAtPath<Font>(SourceFontPath);
            if (sourceFont == null)
            {
                Debug.LogError($"Default UI font source is missing: {SourceFontPath}");
                return;
            }

            Type tmpFontAssetType = FindType("TMPro.TMP_FontAsset");
            if (tmpFontAssetType == null)
            {
                Debug.LogError("Unable to find TMPro.TMP_FontAsset. Make sure TextMeshPro is installed.");
                return;
            }

            Object fontAsset = AssetDatabase.LoadAssetAtPath(TmpFontAssetPath, tmpFontAssetType);
            if (fontAsset == null)
                fontAsset = CreateDynamicTmpFontAsset(sourceFont, tmpFontAssetType);

            if (fontAsset == null)
                return;

            SetTmpDefaultFont(fontAsset);
            ApplyFontToKnownPrefabs(fontAsset, tmpFontAssetType);

            AssetDatabase.SaveAssets();
            AssetDatabase.Refresh();
            Debug.Log($"Installed default UI font: {TmpFontAssetPath}");
        }
        finally
        {
            s_IsInstalling = false;
        }
    }

    [MenuItem("XWorld/UI/Install Default Font", true)]
    private static bool ValidateInstallDefaultFont()
    {
        return File.Exists(SourceFontPath);
    }

    private static Object CreateDynamicTmpFontAsset(Font sourceFont, Type tmpFontAssetType)
    {
        string directory = Path.GetDirectoryName(TmpFontAssetPath);
        if (!string.IsNullOrEmpty(directory))
            Directory.CreateDirectory(directory);

        const int samplingPointSize = 90;
        const int atlasPadding = 9;
        const int atlasSize = 2048;
        const GlyphRenderMode renderMode = GlyphRenderMode.SDFAA;

        Type atlasPopulationModeType = FindType("TMPro.AtlasPopulationMode");
        if (atlasPopulationModeType == null)
        {
            Debug.LogError("Unable to find TMPro.AtlasPopulationMode.");
            return null;
        }

        MethodInfo createFontAsset = tmpFontAssetType.GetMethod(
            "CreateFontAsset",
            BindingFlags.Public | BindingFlags.Static,
            null,
            new[]
            {
                typeof(Font),
                typeof(int),
                typeof(int),
                typeof(GlyphRenderMode),
                typeof(int),
                typeof(int),
                atlasPopulationModeType,
                typeof(bool)
            },
            null);
        if (createFontAsset == null)
        {
            Debug.LogError("Unable to find TMP_FontAsset.CreateFontAsset overload.");
            return null;
        }

        object dynamicMode = Enum.ToObject(atlasPopulationModeType, 1);
        Object fontAsset = createFontAsset.Invoke(
            null,
            new object[]
            {
                sourceFont,
                samplingPointSize,
                atlasPadding,
                renderMode,
                atlasSize,
                atlasSize,
                dynamicMode,
                true
            }) as Object;
        if (fontAsset == null)
        {
            Debug.LogError($"Unable to create TMP font asset from: {SourceFontPath}");
            return null;
        }

        fontAsset.name = "siyuan_CN_Bold SDF";
        AssetDatabase.CreateAsset(fontAsset, TmpFontAssetPath);

        Texture2D[] atlasTextures = tmpFontAssetType.GetProperty("atlasTextures")?.GetValue(fontAsset) as Texture2D[];
        Texture2D texture = atlasTextures != null && atlasTextures.Length > 0 ? atlasTextures[0] : null;
        if (texture != null)
        {
            texture.name = "siyuan_CN_Bold Atlas";
            AssetDatabase.AddObjectToAsset(texture, fontAsset);
        }

        Material material = tmpFontAssetType.GetField("material")?.GetValue(fontAsset) as Material;
        if (material != null)
        {
            material.name = "siyuan_CN_Bold Atlas Material";
            AssetDatabase.AddObjectToAsset(material, fontAsset);
        }

        SetCreationSettings(fontAsset, tmpFontAssetType, samplingPointSize, atlasPadding, atlasSize, renderMode);

        EditorUtility.SetDirty(fontAsset);
        return fontAsset;
    }

    private static void SetCreationSettings(Object fontAsset, Type tmpFontAssetType, int samplingPointSize, int atlasPadding, int atlasSize, GlyphRenderMode renderMode)
    {
        PropertyInfo creationSettingsProperty = tmpFontAssetType.GetProperty("creationSettings");
        if (creationSettingsProperty == null)
            return;

        object settings = Activator.CreateInstance(creationSettingsProperty.PropertyType);
        SetField(settings, "sourceFontFileGUID", AssetDatabase.AssetPathToGUID(SourceFontPath));
        SetField(settings, "pointSize", samplingPointSize);
        SetField(settings, "pointSizeSamplingMode", 0);
        SetField(settings, "padding", atlasPadding);
        SetField(settings, "packingMode", 0);
        SetField(settings, "atlasWidth", atlasSize);
        SetField(settings, "atlasHeight", atlasSize);
        SetField(settings, "characterSetSelectionMode", 7);
        SetField(settings, "characterSequence", string.Empty);
        SetField(settings, "renderMode", (int)renderMode);
        SetField(settings, "includeFontFeatures", false);
        creationSettingsProperty.SetValue(fontAsset, settings);
    }

    private static void SetTmpDefaultFont(Object fontAsset)
    {
        Object settings = AssetDatabase.LoadAssetAtPath<Object>(TmpSettingsPath);
        if (settings == null)
        {
            Debug.LogWarning($"TMP Settings asset is missing: {TmpSettingsPath}");
            return;
        }

        SerializedObject serializedSettings = new SerializedObject(settings);
        serializedSettings.FindProperty("m_defaultFontAsset").objectReferenceValue = fontAsset;
        serializedSettings.ApplyModifiedPropertiesWithoutUndo();
        EditorUtility.SetDirty(settings);
    }

    private static void ApplyFontToKnownPrefabs(Object fontAsset, Type tmpFontAssetType)
    {
        Type tmpTextType = FindType("TMPro.TMP_Text");
        Type tmpInputFieldType = FindType("TMPro.TMP_InputField");
        Object fontMaterial = tmpFontAssetType.GetField("material")?.GetValue(fontAsset) as Object;
        string[] searchFolders =
        {
            "Assets/Game/Art/UI/Prefab",
            "Assets/Base/Prefab"
        };

        string[] prefabGuids = AssetDatabase.FindAssets("t:Prefab", searchFolders);
        foreach (string prefabGuid in prefabGuids)
        {
            string prefabPath = AssetDatabase.GUIDToAssetPath(prefabGuid);
            GameObject prefab = AssetDatabase.LoadAssetAtPath<GameObject>(prefabPath);
            if (prefab == null)
                continue;

            bool changed = false;
            foreach (Component component in prefab.GetComponentsInChildren<Component>(true))
            {
                if (component == null)
                    continue;

                Type componentType = component.GetType();
                if (tmpTextType != null && tmpTextType.IsAssignableFrom(componentType))
                {
                    changed |= SetSerializedObjectReference(component, "m_fontAsset", fontAsset);
                    changed |= SetSerializedObjectReference(component, "m_sharedMaterial", fontMaterial);
                }

                if (tmpInputFieldType != null && tmpInputFieldType.IsAssignableFrom(componentType))
                    changed |= SetSerializedObjectReference(component, "m_GlobalFontAsset", fontAsset);
            }

            if (changed)
                EditorUtility.SetDirty(prefab);
        }
    }

    private static bool SetSerializedObjectReference(Object target, string propertyName, Object value)
    {
        SerializedObject serializedObject = new SerializedObject(target);
        SerializedProperty property = serializedObject.FindProperty(propertyName);
        if (property == null || property.objectReferenceValue == value)
            return false;

        property.objectReferenceValue = value;
        serializedObject.ApplyModifiedPropertiesWithoutUndo();
        EditorUtility.SetDirty(target);
        return true;
    }

    private static void SetField(object target, string fieldName, object value)
    {
        target.GetType().GetField(fieldName)?.SetValue(target, value);
    }

    private static Type FindType(string fullName)
    {
        foreach (Assembly assembly in AppDomain.CurrentDomain.GetAssemblies())
        {
            Type type = assembly.GetType(fullName);
            if (type != null)
                return type;
        }

        return null;
    }
}