// 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;
using System.Collections.Immutable;
using System.Threading;
using Microsoft.CodeAnalysis.Editing;

namespace Microsoft.CodeAnalysis.CodeGeneration;

internal abstract class CodeGenerationTypeSymbol(
    IAssemblySymbol containingAssembly,
    INamedTypeSymbol containingType,
    ImmutableArray<AttributeData> attributes,
    Accessibility declaredAccessibility,
    DeclarationModifiers modifiers,
    string name,
    SpecialType specialType,
    NullableAnnotation nullableAnnotation)
    : CodeGenerationNamespaceOrTypeSymbol(containingAssembly, containingType, attributes, declaredAccessibility, modifiers, name), ITypeSymbol
{
    public SpecialType SpecialType { get; protected set; } = specialType;

    public abstract TypeKind TypeKind { get; }

    public virtual INamedTypeSymbol BaseType => null;

    public virtual ImmutableArray<INamedTypeSymbol> Interfaces
        => [];

    public ImmutableArray<INamedTypeSymbol> AllInterfaces
        => [];

    public bool IsReferenceType => false;

    public bool IsValueType => TypeKind is TypeKind.Struct or TypeKind.Enum;

    public bool IsAnonymousType => false;

    public bool IsTupleType => false;

    public bool IsNativeIntegerType => false;

#if !OLDER_ROSLYN
    bool ITypeSymbol.IsExtension => false;

    IParameterSymbol ITypeSymbol.ExtensionParameter => null;
#endif

    public static ImmutableArray<ITypeSymbol> TupleElementTypes => default;

    public static ImmutableArray<string> TupleElementNames => default;

    public new ITypeSymbol OriginalDefinition => this;

    public ISymbol FindImplementationForInterfaceMember(ISymbol interfaceMember) => null;

    public string ToDisplayString(NullableFlowState topLevelNullability, SymbolDisplayFormat format = null)
        => throw new System.NotImplementedException();

    public ImmutableArray<SymbolDisplayPart> ToDisplayParts(NullableFlowState topLevelNullability, SymbolDisplayFormat format = null)
        => throw new System.NotImplementedException();

    public string ToMinimalDisplayString(SemanticModel semanticModel, NullableFlowState topLevelNullability, int position, SymbolDisplayFormat format = null)
        => throw new System.NotImplementedException();

    public ImmutableArray<SymbolDisplayPart> ToMinimalDisplayParts(SemanticModel semanticModel, NullableFlowState topLevelNullability, int position, SymbolDisplayFormat format = null)
        => throw new System.NotImplementedException();

    public override bool IsNamespace => false;

    public override bool IsType => true;

    bool ITypeSymbol.IsRefLikeType => false;

    bool ITypeSymbol.IsUnmanagedType => throw new System.NotImplementedException();

    bool ITypeSymbol.IsReadOnly => Modifiers.IsReadOnly;

    public virtual bool IsRecord => false;

    public virtual bool IsUnion => false;

    public virtual ImmutableArray<ITypeSymbol> UnionCaseTypes => [];

    public virtual bool IsClosed => false;

#if !OLDER_ROSLYN
    public ClosedDerivedTypeInfo GetClosedDerivedTypeInfo(CancellationToken cancellationToken) => throw new NotImplementedException();
#endif

    public NullableAnnotation NullableAnnotation { get; } = nullableAnnotation;

    public ITypeSymbol WithNullableAnnotation(NullableAnnotation nullableAnnotation)
        => this.NullableAnnotation == nullableAnnotation ? this : CloneWithNullableAnnotation(nullableAnnotation);

    protected sealed override CodeGenerationSymbol Clone()
        => CloneWithNullableAnnotation(this.NullableAnnotation);

    protected abstract CodeGenerationTypeSymbol CloneWithNullableAnnotation(NullableAnnotation nullableAnnotation);
}