// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
#nullable disable
 
using System.Runtime.InteropServices;
using Microsoft.CodeAnalysis;
using Microsoft.VisualStudio.LanguageServices.Implementation.CodeModel.Collections;
using Microsoft.VisualStudio.LanguageServices.Implementation.Interop;
using Microsoft.VisualStudio.LanguageServices.Implementation.Utilities;
 
namespace Microsoft.VisualStudio.LanguageServices.Implementation.CodeModel.InternalElements;
 
[ComVisible(true)]
[ComDefaultInterface(typeof(EnvDTE80.CodeElement2))]
public sealed class CodeImplementsStatement : AbstractCodeElement
{
    internal static EnvDTE80.CodeElement2 Create(
        CodeModelState state,
        AbstractCodeMember parent,
        string namespaceName,
        int ordinal)
    {
        var element = new CodeImplementsStatement(state, parent, namespaceName, ordinal);
        var result = (EnvDTE80.CodeElement2)ComAggregate.CreateAggregatedObject(element);
 
        return result;
    }
 
    internal static EnvDTE80.CodeElement2 CreateUnknown(
        CodeModelState state,
        FileCodeModel fileCodeModel,
        int nodeKind,
        string name)
    {
        var element = new CodeImplementsStatement(state, fileCodeModel, nodeKind, name);
        return (EnvDTE80.CodeElement2)ComAggregate.CreateAggregatedObject(element);
    }
 
    private readonly ParentHandle<AbstractCodeMember> _parentHandle;
    private readonly string _namespaceName;
    private readonly int _ordinal;
 
    private CodeImplementsStatement(
        CodeModelState state,
        AbstractCodeMember parent,
        string namespaceName,
        int ordinal)
        : base(state, parent.FileCodeModel)
    {
        _parentHandle = new ParentHandle<AbstractCodeMember>(parent);
        _namespaceName = namespaceName;
        _ordinal = ordinal;
    }
 
    private CodeImplementsStatement(
        CodeModelState state,
        FileCodeModel fileCodeModel,
        int nodeKind,
        string name)
        : base(state, fileCodeModel, nodeKind)
    {
        _namespaceName = name;
    }
 
    internal override bool TryLookupNode(out SyntaxNode node)
    {
        node = null;
 
        var parentNode = _parentHandle.Value.LookupNode();
        if (parentNode == null)
        {
            return false;
        }
 
        if (!CodeModelService.TryGetImplementsNode(parentNode, _namespaceName, _ordinal, out var implementsNode))
        {
            return false;
        }
 
        node = implementsNode;
        return node != null;
    }
 
    public override EnvDTE.vsCMElement Kind
    {
        get { return EnvDTE.vsCMElement.vsCMElementImplementsStmt; }
    }
 
    public override object Parent
    {
        get { return _parentHandle.Value; }
    }
 
    public override EnvDTE.CodeElements Children
    {
        get { return EmptyCollection.Create(this.State, this); }
    }
 
    protected override void SetName(string value)
        => throw Exceptions.ThrowENotImpl();
 
    public override void RenameSymbol(string newName)
        => throw Exceptions.ThrowENotImpl();
}