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﻿using System;
using System.Collections.Generic;
using System.Text;
namespace UnityDataTools.FileSystem;
// A TypeTreeNode represents how a property of a serialized object was written to disk.
// See the TextDumper library for an example.
public class TypeTreeNode
    int m_FirstChildNodeIndex;
    int m_NextNodeIndex;
    TypeTreeHandle m_Handle;
    Lazy<List<TypeTreeNode>> m_Children;
    Lazy<Type> m_CSharpType;
    Lazy<bool> m_hasConstantSize;
    // The type of the property (basic type like int or float or class names for objects)
    public readonly string Type;
    // The name of the property (e.g. m_IndexBuffer for a Mesh or m_Width for a Texture)
    public readonly string Name;
    // The size of the property (for basic types only, otherwise -1)
    public readonly int Size;
    // The offset of the property (mostly useless).
    public readonly int Offset;
    // Flags used for different things (e.g. field is an array, data alignment, etc.)
    public readonly TypeTreeFlags Flags;
    public readonly TypeTreeMetaFlags MetaFlags;
    // Child nodes container.
    public List<TypeTreeNode> Children => m_Children.Value;
    // True if the field has no child.
    public bool IsLeaf => m_FirstChildNodeIndex == 0;
    // True if the field is a basic type. (int, float, char, etc.)
    public bool IsBasicType => IsLeaf && Size > 0;
    // True if the field is an array.
    public bool IsArray => ((int)Flags & (int)TypeTreeFlags.IsArray) != 0;
    // True if the field is a ManagedReferenceRegistry
    public bool IsManagedReferenceRegistry => ((int)Flags & (int)TypeTreeFlags.IsManagedReferenceRegistry) != 0;
    // C# type corresponding to the node type
    public Type CSharpType => m_CSharpType.Value;
    // True if the node has a constant size (it contains no array or other containers with variable size).
    public bool HasConstantSize => m_hasConstantSize.Value;
    [ThreadStatic]
    static StringBuilder s_NodeType;
    [ThreadStatic]
    static StringBuilder s_NodeName;
    // Properties are required to initialize the ThreadStatic members.
    static StringBuilder NodeTypeBuilder
        get
            if (s_NodeType == null)
                s_NodeType = new StringBuilder(512);
            return s_NodeType;
    static StringBuilder NodeNameBuilder
        get
            if (s_NodeName == null)
                s_NodeName = new StringBuilder(512);
            return s_NodeName;
    internal TypeTreeNode(TypeTreeHandle typeTreeHandle, int nodeIndex)
        m_Handle = typeTreeHandle;
        var r = DllWrapper.GetTypeTreeNodeInfo(m_Handle, nodeIndex, NodeTypeBuilder, NodeTypeBuilder.Capacity, NodeNameBuilder, NodeNameBuilder.Capacity, out Offset, out Size, out Flags, out MetaFlags, out m_FirstChildNodeIndex, out m_NextNodeIndex);
        UnityFileSystem.HandleErrors(r);
        Type = NodeTypeBuilder.ToString();
        Name = NodeNameBuilder.ToString();
        m_Children = new Lazy<List<TypeTreeNode>>(GetChildren);
        m_CSharpType = new Lazy<Type>(GetCSharpType);
        m_hasConstantSize = new Lazy<bool>(GetHasConstantSize);
    internal List<TypeTreeNode> GetChildren()
        var children = new List<TypeTreeNode>();
        var current = m_FirstChildNodeIndex;
        while (current != 0)
            var child = new TypeTreeNode(m_Handle, current);
            children.Add(child);
            current = child.m_NextNodeIndex;
        return children;
    bool GetHasConstantSize()
        if (IsArray || CSharpType == typeof(string))
            return false;
        foreach (var child in Children)
            if (!child.HasConstantSize)
                return false;
        return true;
    Type GetCSharpType()
        switch (Type)
            case "int":
            case "SInt32":
            case "TypePtr":
                return typeof(int);
            case "unsigned int":
            case "UInt32":
                return typeof(uint);
            case "float":
                return typeof(float);
            case "double":
                return typeof(double);
            case "SInt16":
                return typeof(short);
            case "UInt16":
                return typeof(ushort);
            case "SInt64":
                return typeof(long);
            case "FileSize":
            case "UInt64":
                return typeof(ulong);
            case "SInt8":
                return typeof(sbyte);
            case "UInt8":
            case "char":
                return typeof(byte);
            case "bool":
                return typeof(bool);
            case "string":
                return typeof(string);
            default:
                if (Size == 8)
                    return typeof(long);
                else if (Size == 4)
                    return typeof(int);
                else if (Size == 2)
                    return typeof(short);
                else if (Size == 1)
                    return typeof(sbyte);
                return typeof(object);
        throw new Exception($"Unknown type {Type}");
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