// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System.CodeDom;
using System.Collections;
using System.Globalization;
using System.Resources;
using System.Runtime.Serialization;

namespace System.ComponentModel.Design.Serialization;

internal partial class ResourceCodeDomSerializer
{
    /// <summary>
    ///  This is the meat of resource serialization. This implements a resource manager through a host-provided
    ///  <see cref="IResourceService"/> interface. The resource service feeds us with resource readers and writers,
    ///  and we simulate a runtime ResourceManager. There is one instance of this object for the entire
    ///  serialization process, just like there is one resource manager in runtime code. When an instance
    ///  of this object is created, it adds itself to the serialization manager's service list,
    ///  and listens for the SerializationComplete event. When serialization is complete, this will close and
    ///  flush any readers or writers it may have opened and will also remove itself from the service list.
    /// </summary>
    internal class SerializationResourceManager : ComponentResourceManager
    {
        private readonly IDesignerSerializationManager _manager;
        private bool _checkedLocalizationLanguage;
        private CultureInfo? _localizationLanguage;
        private IResourceWriter? _writer;
        private CultureInfo? _readCulture;
        private readonly Dictionary<string, int> _nameTable;
        private Dictionary<CultureInfo, Dictionary<string, object?>?>? _resourceSets;
        private Dictionary<string, object?>? _metadata;
        private Dictionary<string, object?>? _mergedMetadata;
        private object? _rootComponent;
        private HashSet<object>? _propertyFillAdded;
        private bool _invariantCultureResourcesDirty;
        private bool _metadataResourcesDirty;

        public SerializationResourceManager(IDesignerSerializationManager manager)
        {
            _manager = manager;
            _nameTable = [];

            // We need to know when we're done so we can push the resource file out.
            manager.SerializationComplete += OnSerializationComplete;
        }

        /// <summary>
        ///  State the serializers use to determine if the declaration of this resource manager has been performed. This
        ///  is just per-document state we keep; we do not actually care about this value.
        /// </summary>
        public bool DeclarationAdded { get; set; }

        /// <summary>
        ///  When a declaration is added, we also setup an expression other serializers can use to reference our resource
        ///  declaration. This bit tracks if we have setup this expression yet. Note that the expression and declaration
        ///  may be added at different times, if the declaration was added by a cached component.
        /// </summary>
        public bool ExpressionAdded { get; set; }

        /// <summary>
        ///  The language we should be localizing into.
        /// </summary>
        private CultureInfo? LocalizationLanguage
        {
            get
            {
                if (_checkedLocalizationLanguage)
                {
                    return _localizationLanguage;
                }

                // Check to see if our base component's localizable prop is true
                if (_manager.TryGetContext(out RootContext? rootCtx))
                {
                    object comp = rootCtx.Value;
                    if (TypeDescriptorHelper.TryGetPropertyValue(comp, "LoadLanguage", out CultureInfo? cultureInfo))
                    {
                        _localizationLanguage = cultureInfo;
                    }
                }

                _checkedLocalizationLanguage = true;
                return _localizationLanguage;
            }
        }

        /// <summary>
        ///  This is the culture info we should use to read and write resources. We always write using the same
        ///  culture we read with so we don't stomp on data.
        /// </summary>
        private CultureInfo ReadCulture => _readCulture ??= LocalizationLanguage ?? CultureInfo.InvariantCulture;

        /// <summary>
        ///  Returns a hash table where we shove resource sets.
        /// </summary>
        private Dictionary<CultureInfo, Dictionary<string, object?>?> ResourceTable
            => _resourceSets ??= [];

        /// <summary>
        ///  Retrieves the root component we're designing.
        /// </summary>
        private object? RootComponent => _rootComponent ??= _manager.GetContext<RootContext>()?.Value;

        /// <summary>
        ///  Retrieves a resource writer we should write into.
        /// </summary>
        private IResourceWriter Writer
        {
            get
            {
                if (_writer is null)
                {
                    if (_manager.TryGetService(out IResourceService? rs))
                    {
                        // We always write with the culture we read with. In the event of a language change
                        // during localization, we will write the new language to the source code
                        // and then perform a reload.
                        _writer = rs.GetResourceWriter(ReadCulture);
                    }
                    else
                    {
                        // No resource service, so there is no way to create a resource writer for the object.
                        // In this case we just create an empty one so the resources go into the bit-bucket.
                        Debug.Fail("We expected to get IResourceService -- no resource serialization will be available");
                        _writer = new ResourceWriter(new MemoryStream());
                    }
                }

                return _writer;
            }
        }

        /// <summary>
        ///  The component serializer supports caching serialized outputs for speed. It holds both a collection
        ///  of statements as well as an opaque blob for resources. This function adds data to that blob.
        ///  The parameters to this function are the same as those to SetValue,
        ///  or SetMetadata (when isMetadata is <see langword="true"/>).
        /// </summary>
        private static void AddCacheEntry(IDesignerSerializationManager manager, string name, object? value, bool isMetadata, bool forceInvariant, bool shouldSerializeValue, bool ensureInvariant)
        {
            if (manager.TryGetContext(out ComponentCache.Entry? entry))
            {
                ComponentCache.ResourceEntry re = new(
                    name,
                    value,
                    forceInvariant,
                    shouldSerializeValue,
                    ensureInvariant,
                    manager.GetContext<PropertyDescriptor>(),
                    manager.GetContext<ExpressionContext>());

                if (isMetadata)
                {
                    entry.AddMetadata(re);
                }
                else
                {
                    if (re.PropertyDescriptor is null)
                    {
                        throw new ArgumentException("Serialization manager should have a PropertyDescriptor context");
                    }

                    if (re.ExpressionContext is null)
                    {
                        throw new ArgumentException("Serialization manager should have an ExpressionContext context");
                    }

                    entry.AddResource(re);
                }
            }
        }

        /// <summary>
        ///  Returns true if the caller should add a property fill statement for the given object.
        ///  A property fill is required for the component only once, so this remembers the value.
        /// </summary>
        public bool AddPropertyFill(object value)
        {
            _propertyFillAdded ??= [];
            return _propertyFillAdded.Add(value);
        }

        /// <summary>
        ///  This method examines all the resources for the provided culture.
        ///  When it finds a resource with a key in the format of "[objectName].[property name]";
        ///  it will apply that resources value to the corresponding property on the object.
        /// </summary>
        [RequiresUnreferencedCode("The Type of value cannot be statically discovered.")]
        public override void ApplyResources(object value, string objectName, CultureInfo? culture)
        {
            culture ??= ReadCulture;

            // .NET Framework 4.0 (Dev10 #425129): Control location moves due to incorrect anchor info when resource files are reloaded.
            Windows.Forms.Control? control = value as Windows.Forms.Control;
            control?.SuspendLayout();

            base.ApplyResources(value, objectName, culture);

            control?.ResumeLayout(false);
        }

        /// <summary>
        ///  This determines if the given resource name/value pair can be retrieved from a parent culture.
        ///  We don't want to write duplicate resources for each language, so we do a check of the parent culture.
        /// </summary>
        private CompareValue CompareWithParentValue(string name, object? value)
        {
            Debug.Assert(name is not null, "name is null");
            // If there is no parent culture, treat that as being different from the parent's resource.
            // which results in the "normal" code path for the caller.
            return ReadCulture.Equals(CultureInfo.InvariantCulture)
                ? CompareValue.Different
                : CompareWithParentValue(ReadCulture, name, value);
        }

        private CompareValue CompareWithParentValue(CultureInfo culture, string name, object? value)
        {
            Debug.Assert(culture.Parent != culture, "should have returned when culture = InvariantCulture");
            CultureInfo parent = culture.Parent;
            Dictionary<string, object?>? resourceSet = GetResourceSet(culture);
            if (resourceSet is not null && resourceSet.TryGetValue(name, out object? parentValue))
            {
                return parentValue is null || !parentValue.Equals(value) ? CompareValue.Different : CompareValue.Same;
            }
            else if (culture.Equals(CultureInfo.InvariantCulture))
            {
                return CompareValue.New;
            }

            return CompareWithParentValue(parent, name, value);
        }

        /// <summary>
        ///  Creates a resource set dictionary for the given resource reader.
        /// </summary>
        private Dictionary<string, object?> CreateResourceSet(IResourceReader reader, CultureInfo culture)
        {
            Dictionary<string, object?> result = [];

            // We need to guard against bad or unloadable resources. We warn the user in the task list here,
            // but we will still load the designer.
            try
            {
                IDictionaryEnumerator resEnum = reader.GetEnumerator();
                while (resEnum.MoveNext())
                {
                    string name = (string)resEnum.Key;
                    object? value = resEnum.Value;
                    result[name] = value;
                }
            }
            catch (Exception e)
            {
                string message = e.Message;
                if (string.IsNullOrEmpty(message))
                {
                    message = e.GetType().Name;
                }

                Exception se = culture == CultureInfo.InvariantCulture
                    ? new SerializationException(string.Format(SR.SerializerResourceExceptionInvariant, message), e)
                    : (Exception)new SerializationException(string.Format(SR.SerializerResourceException, culture.ToString(), message), e);

                _manager.ReportError(se);
            }

            return result;
        }

        /// <summary>
        ///  This returns a dictionary enumerator for metadata on the invariant culture.
        ///  If no metadata can be found this will return null.
        /// </summary>
        public IDictionaryEnumerator? GetMetadataEnumerator()
        {
            if (_mergedMetadata is not null)
            {
                return _mergedMetadata.GetEnumerator();
            }

            Dictionary<string, object?>? metaData = GetMetadata();
            if (metaData is not null)
            {
                // This is for backwards compatibility and also for the case when our reader/writer don't
                // support metadata. We must merge the original enumeration data in here or else existing
                // design time properties won't show up. That would be really bad for things like Localizable.
                Dictionary<string, object?>? resourceSet = GetResourceSet(CultureInfo.InvariantCulture);
                if (resourceSet is not null)
                {
                    foreach (KeyValuePair<string, object?> item in resourceSet)
                    {
                        metaData.TryAdd(item.Key, item.Value);
                    }
                }

                _mergedMetadata = metaData;
            }

            return _mergedMetadata?.GetEnumerator();
        }

        /// <summary>
        ///  This returns a dictionary enumerator for the given culture.
        ///  If no such resource file exists for the culture this will return null.
        /// </summary>
        public IDictionaryEnumerator? GetEnumerator(CultureInfo culture)
        {
            Dictionary<string, object?>? ht = GetResourceSet(culture);
            return ht?.GetEnumerator();
        }

        /// <summary>
        ///  Loads the metadata table
        /// </summary>
        private Dictionary<string, object?>? GetMetadata()
        {
            if (_metadata is not null)
            {
                return _metadata;
            }

            IResourceService? resSvc = _manager.GetService<IResourceService>();
            IResourceReader? reader = resSvc?.GetResourceReader(CultureInfo.InvariantCulture);
            if (reader is not null)
            {
                try
                {
                    if (reader is ResXResourceReader resxReader)
                    {
                        _metadata = [];
                        IDictionaryEnumerator de = resxReader.GetMetadataEnumerator();
                        while (de.MoveNext())
                        {
                            _metadata[(string)de.Key] = de.Value;
                        }
                    }
                }
                finally
                {
                    reader.Close();
                }
            }

            return _metadata;
        }

        /// <summary>
        ///  Overrides ResourceManager.GetObject to return the requested object. Returns null if the object couldn't be found.
        /// </summary>
        public override object? GetObject(string resourceName)
        {
            return GetObject(resourceName, false);
        }

        /// <summary>
        ///  Retrieves the object of the given name from our resource bundle.
        ///  If forceInvariant is <see langword="true"/>, this will always use the invariant resource,
        ///  rather than using the current language.
        ///  Returns <see langword="null"/> if the object couldn't be found.
        /// </summary>
        public object? GetObject(string resourceName, bool forceInvariant)
        {
            Debug.Assert(_manager is not null, "This resource manager object has been destroyed.");
            // We fetch the read culture if someone asks for a culture-sensitive string.
            // If forceInvariant is set, we always use the invariant culture.
            CultureInfo culture = forceInvariant ? CultureInfo.InvariantCulture : ReadCulture;
            CultureInfo lastCulture;

            object? value = null;
            do
            {
                Dictionary<string, object?>? rs = GetResourceSet(culture);
                rs?.TryGetValue(resourceName, out value);

                lastCulture = culture;
                culture = culture.Parent;
            }
            while (value is null && !lastCulture.Equals(culture));

            return value;
        }

        /// <summary>
        ///  Looks up the resource set in the resourceSets hash table, loading the set if it hasn't been loaded already.
        ///  Returns <see langword="null"/> if no resource that exists for that culture.
        /// </summary>
        private Dictionary<string, object?>? GetResourceSet(CultureInfo culture)
        {
            Debug.Assert(culture is not null, "null parameter");
            if (!ResourceTable.TryGetValue(culture, out Dictionary<string, object?>? resourceSet))
            {
                if (_manager.TryGetService(out IResourceService? resSvc))
                {
                    IResourceReader? reader = resSvc.GetResourceReader(culture);
                    if (reader is not null)
                    {
                        try
                        {
                            resourceSet = CreateResourceSet(reader, culture);
                        }
                        finally
                        {
                            reader.Close();
                        }
                    }
                    else if (culture.Equals(CultureInfo.InvariantCulture))
                    {
                        // If this is the invariant culture, always provide a resource set.
                        resourceSet = [];
                    }

                    // resourceSet may be null here. We add it to the cache anyway as a sentinel so we don't repeatedly ask for the same resource.
                    ResourceTable[culture] = resourceSet;
                }
            }

            return resourceSet;
        }

        /// <summary>
        ///  Override of GetResourceSet from ResourceManager.
        /// </summary>
        public override ResourceSet? GetResourceSet(CultureInfo culture, bool createIfNotExists, bool tryParents)
        {
            ArgumentNullException.ThrowIfNull(culture);

            CultureInfo lastCulture;
            do
            {
                lastCulture = culture;
                culture = culture.Parent;
            }
            while (tryParents && !lastCulture.Equals(culture));

            return createIfNotExists ? new CodeDomResourceSet() : null;
        }

        /// <summary>
        ///  Overrides ResourceManager.GetString to return the requested string. Returns null if the string couldn't be found.
        /// </summary>
        public override string? GetString(string resourceName)
        {
            return GetObject(resourceName, false) as string;
        }

        /// <summary>
        ///  Event handler that gets called when serialization or deserialization is complete.
        ///  Here we need to write any resources to disk. Since we open resources for write on demand,
        ///  this code handles the case of reading resources as well.
        /// </summary>
        private void OnSerializationComplete(object? sender, EventArgs e)
        {
            // Commit any changes we have made.
            _writer?.Close();
            _writer = null;

            if (_invariantCultureResourcesDirty || _metadataResourcesDirty)
            {
                if (_manager.TryGetService(out IResourceService? service))
                {
                    IResourceWriter invariantWriter = service.GetResourceWriter(CultureInfo.InvariantCulture);
                    Debug.Assert(invariantWriter is not null, "GetResourceWriter returned null for the InvariantCulture");

                    try
                    {
                        // Do the invariant resources first
                        Debug.Assert(!ReadCulture.Equals(CultureInfo.InvariantCulture), "invariantCultureResourcesDirty should only come into play when readCulture != CultureInfo.InvariantCulture; check that CompareWithParentValue is correct");
                        ResourceTable.TryGetValue(CultureInfo.InvariantCulture, out Dictionary<string, object?>? resourceSet);
                        Debug.Assert(resourceSet is not null, "ResourceSet for the InvariantCulture not loaded, but it's considered dirty?");

                        // Dump the hash table to the resource writer
                        foreach ((string name, object? value) in resourceSet)
                        {
                            invariantWriter.AddResource(name, value);
                        }

                        _invariantCultureResourcesDirty = false;

                        // Followed by the metadata.
                        Debug.Assert(_metadata is not null, "No metadata, but it's dirty?");
                        if (invariantWriter is ResXResourceWriter resxWriter)
                        {
                            foreach (KeyValuePair<string, object?> de in _metadata)
                            {
                                resxWriter.AddMetadata(de.Key, de.Value);
                            }
                        }
                        else
                        {
                            Debug.Fail("Metadata not supported, but it's dirty?");
                        }

                        _metadataResourcesDirty = false;
                    }
                    finally
                    {
                        invariantWriter.Close();
                    }
                }
                else
                {
                    Debug.Fail("Couldn't find IResourceService");
                    _invariantCultureResourcesDirty = false;
                    _metadataResourcesDirty = false;
                }
            }
        }

        /// <summary>
        ///  Writes a metadata tag to the resource, or writes a normal tag if the resource writer doesn't support metadata.
        /// </summary>
        public void SetMetadata(IDesignerSerializationManager manager, string resourceName, object? value, bool shouldSerializeValue, bool applyingCachedResources)
        {
#pragma warning disable SYSLIB0050 // Type or member is obsolete
            if (value is not null && (!value.GetType().IsSerializable))
            {
                Debug.Fail($"Cannot save a non-serializable value into resources. Add serializable to {(value is null ? "(null)" : value.GetType().Name)}");
                return;
            }
#pragma warning restore SYSLIB0050

            // If we are currently the invariant culture then we may be able to write directly.
            if (ReadCulture.Equals(CultureInfo.InvariantCulture))
            {
                if (shouldSerializeValue)
                {
                    if (Writer is ResXResourceWriter resxWriter)
                    {
                        resxWriter.AddMetadata(resourceName, value);
                    }
                    else
                    {
                        Writer.AddResource(resourceName, value);
                    }
                }
            }
            else
            {
                // Check if the invariant writer supports metadata. If not, we need to push metadata as regular data.
                IResourceService? service = manager.GetService<IResourceService>();
                IResourceWriter? invariantWriter = service?.GetResourceWriter(CultureInfo.InvariantCulture);

                // GetResourceSet never returns null for CultureInfo.InvariantCulture
                Dictionary<string, object?> invariant = GetResourceSet(CultureInfo.InvariantCulture)!;
                Dictionary<string, object?>? metadata;
                if (invariantWriter is null or ResXResourceWriter)
                {
                    metadata = GetMetadata();
                    if (metadata is null)
                    {
                        _metadata = [];
                        metadata = _metadata;
                    }

                    // Note that when we read metadata, for backwards compatibility,
                    // we also merge in regular data from the invariant resource.
                    // We need to clear that data here, since we are going to write out metadata separately.
                    invariant.Remove(resourceName);
                    _metadataResourcesDirty = true;
                }
                else
                {
                    metadata = invariant;
                    _invariantCultureResourcesDirty = true;
                }

                Debug.Assert(metadata is not null, "Don't know where to push metadata.");
                if (metadata is not null)
                {
                    if (shouldSerializeValue)
                    {
                        metadata[resourceName] = value;
                    }
                    else
                    {
                        metadata.Remove(resourceName);
                    }
                }

                _mergedMetadata = null;
            }

            // Update the component cache, if we have one active
            if (!applyingCachedResources)
            {
                AddCacheEntry(manager, resourceName, value, true, false, shouldSerializeValue, false);
            }
        }

        /// <summary>
        ///  Writes the given resource value under the given name. This checks the parent resource to see if the values
        ///  are the same. If they are, the resource is not written. If not, then the resource is written.
        ///  We always write using the resource language we read in with, so we don't stomp on the wrong resource data
        ///  in the event that someone changes the language.
        /// </summary>
        public void SetValue(IDesignerSerializationManager manager, string resourceName, object? value, bool forceInvariant, bool shouldSerializeInvariant, bool ensureInvariant, bool applyingCachedResources)
        {
            // Values we are going to serialize must be serializable or else the resource writer will fail when we close it.
#pragma warning disable SYSLIB0050 // Type or member is obsolete
            if (value is not null && (!value.GetType().IsSerializable))
            {
                Debug.Fail($"Cannot save a non-serializable value into resources. Add serializable to {(value is null ? "(null)" : value.GetType().Name)}");
                return;
            }
#pragma warning restore SYSLIB0050

            if (forceInvariant)
            {
                if (ReadCulture.Equals(CultureInfo.InvariantCulture))
                {
                    if (shouldSerializeInvariant)
                    {
                        Writer.AddResource(resourceName, value);
                    }
                }
                else
                {
                    Dictionary<string, object?>? resourceSet = GetResourceSet(CultureInfo.InvariantCulture);
                    Debug.Assert(resourceSet is not null, "No ResourceSet for the InvariantCulture?");
                    if (shouldSerializeInvariant)
                    {
                        resourceSet[resourceName] = value;
                    }
                    else
                    {
                        resourceSet.Remove(resourceName);
                    }

                    _invariantCultureResourcesDirty = true;
                }
            }
            else
            {
                CompareValue comparison = CompareWithParentValue(resourceName, value);
                switch (comparison)
                {
                    case CompareValue.Same:
                        // don't add to any resource set
                        break;
                    case CompareValue.Different:
                        Writer.AddResource(resourceName, value);
                        break;
                    case CompareValue.New:
                        if (ensureInvariant)
                        {
                            // Add resource to InvariantCulture
                            Debug.Assert(!ReadCulture.Equals(CultureInfo.InvariantCulture), "invariantCultureResourcesDirty should only come into play when readCulture != CultureInfo.InvariantCulture; check that CompareWithParentValue is correct");
                            Dictionary<string, object?>? resourceSet = GetResourceSet(CultureInfo.InvariantCulture);
                            Debug.Assert(resourceSet is not null, "No ResourceSet for the InvariantCulture?");
                            resourceSet[resourceName] = value;
                            _invariantCultureResourcesDirty = true;
                            Writer.AddResource(resourceName, value);
                        }
                        else
                        {
                            // This is a new value. We want to write it out, PROVIDED that the value is not associated
                            // with a property that is currently returning false from ShouldSerializeValue.
                            // This allows us to skip writing out Font == NULL on all non-invariant cultures,
                            // but still allow us to write out the value if the user is resetting a font back to null.
                            // If we cannot associate the value with a property we will write it out just to be safe.
                            // In addition, we need to handle the case of the user adding a new component
                            // to the non-invariant language. This would be bad, because when he/she moved back
                            // to the invariant language the component's properties would all be defaults.
                            // In order to minimize this problem, but still allow holes in the invariant resx,
                            // we also check to see if the property can be reset. If it cannot be reset,
                            // that means that it has no meaningful default. Therefore, it should have appeared
                            // in the invariant resx and its absence indicates a new component.
                            bool writeValue = true;
                            bool writeInvariant = false;
                            if (manager.TryGetContext(out PropertyDescriptor? prop))
                            {
                                if (manager.TryGetContext(out ExpressionContext? tree) && tree.Expression is CodePropertyReferenceExpression)
                                {
                                    writeValue = prop.ShouldSerializeValue(tree.Owner);
                                    writeInvariant = !prop.CanResetValue(tree.Owner);
                                }
                            }

                            if (writeValue)
                            {
                                Writer.AddResource(resourceName, value);
                                if (writeInvariant)
                                {
                                    // Add resource to InvariantCulture
                                    Debug.Assert(!ReadCulture.Equals(CultureInfo.InvariantCulture), "invariantCultureResourcesDirty should only come into play when readCulture != CultureInfo.InvariantCulture; check that CompareWithParentValue is correct");
                                    Dictionary<string, object?>? resourceSet = GetResourceSet(CultureInfo.InvariantCulture);
                                    Debug.Assert(resourceSet is not null, "No ResourceSet for the InvariantCulture?");
                                    resourceSet[resourceName] = value;
                                    _invariantCultureResourcesDirty = true;
                                }
                            }
                        }

                        break;
                    default:
                        Debug.Fail($"Unknown CompareValue {comparison}");
                        break;
                }
            }

            // Update the component cache, if we have one active. We don't have to be fancy here because updating
            // this cache just indicates that code in the component cache will later call us to re-apply the resources,
            // and our logic above will be called again.
            if (!applyingCachedResources)
            {
                AddCacheEntry(manager, resourceName, value, false, forceInvariant, shouldSerializeInvariant, ensureInvariant);
            }
        }

        /// <summary>
        ///  Writes the given resource value under the given name.
        ///  This checks the parent resource to see if the values are the same.
        ///  If they are, the resource is not written. If not, then the resource is written.
        ///  We always write using the resource language we read in with,
        ///  so we don't stomp on the wrong resource data in the event that someone changes the language.
        /// </summary>
        public string SetValue(IDesignerSerializationManager manager, ExpressionContext? tree, object? value, bool forceInvariant, bool shouldSerializeInvariant, bool ensureInvariant, bool applyingCachedResources)
        {
            string? nameBase;
            bool appendCount = false;
            if (tree is not null)
            {
                if (tree.Owner == RootComponent)
                {
                    nameBase = "$this";
                }
                else
                {
                    nameBase = manager.GetName(tree.Owner);
                    if (nameBase is null && manager.TryGetService(out IReferenceService? referenceService))
                    {
                        nameBase = referenceService.GetName(tree.Owner);
                    }
                }

                CodeExpression expression = tree.Expression;
                string? expressionName;
                if (expression is CodePropertyReferenceExpression codeProperty)
                {
                    expressionName = codeProperty.PropertyName;
                }
                else if (expression is CodeFieldReferenceExpression codeField)
                {
                    expressionName = codeField.FieldName;
                }
                else if (expression is CodeMethodReferenceExpression codeMethod)
                {
                    expressionName = codeMethod.MethodName;
                    if (expressionName.StartsWith("Set", StringComparison.InvariantCulture))
                    {
                        expressionName = expressionName[3..];
                    }
                }
                else
                {
                    expressionName = null;
                }

                nameBase ??= "resource";

                if (expressionName is not null)
                {
                    nameBase += "." + expressionName;
                }
            }
            else
            {
                nameBase = "resource";
                appendCount = true;
            }

            // Now find an unused name
            string resourceName = nameBase;

            // Only append the number when appendCount is set or if there is already a count.
            int count = 0;

            if (appendCount || _nameTable.ContainsKey(nameBase))
            {
                _nameTable.TryGetValue(nameBase, out count);

                do
                {
                    count++;
                    resourceName = $"{nameBase}{count}";
                }
                while (_nameTable.ContainsKey(resourceName));
            }

            // Now that we have a name, write out the resource.
            SetValue(manager, resourceName, value, forceInvariant, shouldSerializeInvariant, ensureInvariant, applyingCachedResources);
            _nameTable[resourceName] = count;
            return resourceName;
        }

        private class CodeDomResourceSet : ResourceSet
        {
            public CodeDomResourceSet()
            {
            }
        }

        private enum CompareValue
        {
            Same, // parent value == child value
            Different, // parent value exists, but != child value
            New, // parent value does not exist
        }
    }
}
