// 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 Microsoft.CodeAnalysis.CSharp.Syntax;
using System.Diagnostics.CodeAnalysis;
using System.Text.Json.Serialization;
 
namespace Microsoft.CodeAnalysis.Editor.CSharp.StringCopyPaste
{
    /// <summary>
    /// Content from a string literal or interpolated string that has been copied.
    /// </summary>
    internal readonly struct StringCopyPasteContent
    {
        public StringCopyPasteContentKind Kind { get; }
 
        /// <summary>
        /// The actual string value for <see cref="StringCopyPasteContentKind.Text"/>.  <see langword="null"/> for <see
        /// cref="StringCopyPasteContentKind.Interpolation"/>.
        /// </summary>
        public string? TextValue { get; }
 
        /// <summary>
        /// The actual string value for <see cref="InterpolationSyntax.Expression"/> for <see
        /// cref="StringCopyPasteContentKind.Interpolation"/>.  <see langword="null"/> for <see
        /// cref="StringCopyPasteContentKind.Text"/>.
        /// </summary>
        public string? InterpolationExpression { get; }
 
        /// <summary>
        /// The actual string value for <see cref="InterpolationSyntax.AlignmentClause"/> for <see
        /// cref="StringCopyPasteContentKind.Interpolation"/>.  <see langword="null"/> for <see
        /// cref="StringCopyPasteContentKind.Text"/>.
        /// </summary>
        public string? InterpolationAlignmentClause { get; }
 
        /// <summary>
        /// The actual string value for <see cref="InterpolationSyntax.FormatClause"/> for <see
        /// cref="StringCopyPasteContentKind.Interpolation"/>.  <see langword="null"/> for <see
        /// cref="StringCopyPasteContentKind.Text"/>.
        /// </summary>
        public string? InterpolationFormatClause { get; }
 
        [JsonConstructor]
        public StringCopyPasteContent(
            StringCopyPasteContentKind kind,
            string? textValue,
            string? interpolationExpression,
            string? interpolationAlignmentClause,
            string? interpolationFormatClause)
        {
            Kind = kind;
            TextValue = textValue;
            InterpolationExpression = interpolationExpression;
            InterpolationAlignmentClause = interpolationAlignmentClause;
            InterpolationFormatClause = interpolationFormatClause;
        }
 
        [JsonIgnore]
        [MemberNotNullWhen(true, nameof(TextValue))]
        public bool IsText => Kind == StringCopyPasteContentKind.Text;
 
        [JsonIgnore]
        [MemberNotNullWhen(true, nameof(InterpolationExpression))]
        public bool IsInterpolation => Kind == StringCopyPasteContentKind.Interpolation;
 
        public static StringCopyPasteContent ForText(string text)
            => new(StringCopyPasteContentKind.Text, text, null, null, null);
 
        public static StringCopyPasteContent ForInterpolation(string expression, string? alignmentClause, string? formatClause)
            => new(StringCopyPasteContentKind.Interpolation, null, expression, alignmentClause, formatClause);
    }
}