// 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.Diagnostics;
using System.Reflection;

namespace Microsoft.CodeAnalysis.CSharp
{
    internal partial class SymbolDisplayVisitor
    {
        private void AddConstantValue(ITypeSymbol type, object? constantValue, bool preferNumericValueOrExpandedFlagsForEnum = false)
        {
            if (constantValue != null)
            {
                AddNonNullConstantValue(type, constantValue, preferNumericValueOrExpandedFlagsForEnum);
            }
            else if (type.IsReferenceType || type.TypeKind == TypeKind.Pointer || ITypeSymbolHelpers.IsNullableType(type))
            {
                AddKeyword(SyntaxKind.NullKeyword);
            }
            else
            {
                AddKeyword(SyntaxKind.DefaultKeyword);
                if (!Format.MiscellaneousOptions.IncludesOption(SymbolDisplayMiscellaneousOptions.AllowDefaultLiteral))
                {
                    AddPunctuation(SyntaxKind.OpenParenToken);
                    type.Accept(this.NotFirstVisitor);
                    AddPunctuation(SyntaxKind.CloseParenToken);
                }
            }
        }

        protected override void AddExplicitlyCastedLiteralValue(INamedTypeSymbol namedType, SpecialType type, object value)
        {
            AddPunctuation(SyntaxKind.OpenParenToken);
            namedType.Accept(this.NotFirstVisitor);
            AddPunctuation(SyntaxKind.CloseParenToken);
            AddLiteralValue(type, value);
        }

        protected override void AddLiteralValue(SpecialType type, object value)
        {
            Debug.Assert(value.GetType().GetTypeInfo().IsPrimitive || value is string || value is decimal);
            var valueString = SymbolDisplay.FormatPrimitive(value, quoteStrings: true, useHexadecimalNumbers: false);
            Debug.Assert(valueString != null);

            var kind = SymbolDisplayPartKind.NumericLiteral;
            switch (type)
            {
                case SpecialType.System_Boolean:
                    kind = SymbolDisplayPartKind.Keyword;
                    break;

                case SpecialType.System_String:
                case SpecialType.System_Char:
                    kind = SymbolDisplayPartKind.StringLiteral;
                    break;
            }

            this.Builder.Add(CreatePart(kind, null, valueString));
        }

        protected override void AddBitwiseOr()
        {
            AddPunctuation(SyntaxKind.BarToken);
        }
    }
}