// 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.
 
namespace Roslyn.LanguageServer.Protocol;
 
using System;
using System.Globalization;
using System.Text.Json.Serialization;
 
/// <summary>
/// Class which represents a text document, but has a version identifier.
///
/// See the <see href="https://microsoft.github.io/language-server-protocol/specifications/specification-current/#versionedTextDocumentIdentifier">Language Server Protocol specification</see> for additional information.
/// </summary>
internal sealed class VersionedTextDocumentIdentifier : TextDocumentIdentifier, IEquatable<VersionedTextDocumentIdentifier>
{
    /// <summary>
    /// Gets or sets the version of the document.
    /// </summary>
    [JsonPropertyName("version")]
    public int Version
    {
        get;
        set;
    }
 
    public static bool operator ==(VersionedTextDocumentIdentifier? value1, VersionedTextDocumentIdentifier? value2)
    {
        if (ReferenceEquals(value1, value2))
        {
            return true;
        }
 
        // Is null?
        if (ReferenceEquals(null, value2))
        {
            return false;
        }
 
        return value1?.Equals(value2) ?? false;
    }
 
    public static bool operator !=(VersionedTextDocumentIdentifier? value1, VersionedTextDocumentIdentifier? value2)
    {
        return !(value1 == value2);
    }
 
    /// <inheritdoc/>
    public bool Equals(VersionedTextDocumentIdentifier other)
    {
        return other is not null
            && this.Version == other.Version
            && base.Equals(other);
    }
 
    /// <inheritdoc/>
    public override bool Equals(object obj)
    {
        if (obj is VersionedTextDocumentIdentifier other)
        {
            return this.Equals(other);
        }
        else
        {
            return false;
        }
    }
 
    /// <inheritdoc/>
    public override int GetHashCode()
    {
        return this.Version.GetHashCode()
            ^ (base.GetHashCode() * 79);
    }
 
    /// <inheritdoc/>
    public override string ToString()
    {
        // Invariant culture because the culture on the server vs client may vary.
        return base.ToString() + "|" + this.Version.ToString(CultureInfo.InvariantCulture);
    }
}