// 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.

using System;

namespace Microsoft.CodeAnalysis.GenerateType;

[Flags]
internal enum TypeKindOptions
{
    None = 0x0,

    Class = 0x1,
    Structure = 0x2,
    Interface = 0x4,
    Enum = 0x8,
    Delegate = 0x10,
    Module = 0x20,

    // Enables class, struct, interface, enum and delegate
    AllOptions = Class | Structure | Interface | Enum | Delegate,

    // Only class is valid with Attribute
    Attribute = Class,

    // Only class, struct and interface are allowed. No Enums
    BaseList = Class | Interface,

    AllOptionsWithModule = AllOptions | Module,

    // Only Interface and Delegate cannot be part of the member access with Namespace as Left expression
    MemberAccessWithNamespace = Class | Structure | Enum | Module,

    // Enum and Modules are incompatible with Generics
    GenericInCompatibleTypes = Enum | Module
}

internal sealed class TypeKindOptionsHelper
{
    public static bool IsClass(TypeKindOptions option)
        => (option & TypeKindOptions.Class) != 0 ? true : false;

    public static bool IsStructure(TypeKindOptions option)
        => (option & TypeKindOptions.Structure) != 0 ? true : false;

    public static bool IsInterface(TypeKindOptions option)
        => (option & TypeKindOptions.Interface) != 0 ? true : false;

    public static bool IsEnum(TypeKindOptions option)
        => (option & TypeKindOptions.Enum) != 0 ? true : false;

    public static bool IsDelegate(TypeKindOptions option)
        => (option & TypeKindOptions.Delegate) != 0 ? true : false;

    public static bool IsModule(TypeKindOptions option)
        => (option & TypeKindOptions.Module) != 0 ? true : false;

    public static TypeKindOptions RemoveOptions(TypeKindOptions fromValue, params ReadOnlySpan<TypeKindOptions> removeValues)
    {
        var tempReturnValue = fromValue;
        foreach (var removeValue in removeValues)
        {
            tempReturnValue &= ~removeValue;
        }

        return tempReturnValue;
    }

    internal static TypeKindOptions AddOption(TypeKindOptions toValue, TypeKindOptions addValue)
        => toValue | addValue;
}