// 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.Text.Json.Serialization;
 
    /// <summary>
    /// <see cref="VSTextDocumentIdentifier"/> extends <see cref="TextDocumentIdentifier"/> providing additional properties used by Visual Studio.
    /// </summary>
    internal class VSTextDocumentIdentifier : TextDocumentIdentifier, IEquatable<VSTextDocumentIdentifier>
    {
        /// <summary>
        /// Gets or sets the project context of the text document.
        /// </summary>
        [JsonPropertyName("_vs_projectContext")]
        [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
        public VSProjectContext? ProjectContext
        {
            get;
            set;
        }
 
        public static bool operator ==(VSTextDocumentIdentifier? value1, VSTextDocumentIdentifier? value2)
        {
            if (ReferenceEquals(value1, value2))
            {
                return true;
            }
 
            // Is null?
            if (ReferenceEquals(null, value2))
            {
                return false;
            }
 
            return value1?.Equals(value2) ?? false;
        }
 
        public static bool operator !=(VSTextDocumentIdentifier? value1, VSTextDocumentIdentifier? value2)
        {
            return !(value1 == value2);
        }
 
        /// <inheritdoc/>
        public bool Equals(VSTextDocumentIdentifier other)
        {
            return this.ProjectContext == other.ProjectContext
                && base.Equals(other);
        }
 
        /// <inheritdoc/>
        public override bool Equals(object obj)
        {
            if (obj is VSTextDocumentIdentifier other)
            {
                return this.Equals(other);
            }
            else
            {
                return false;
            }
        }
 
        /// <inheritdoc/>
        public override int GetHashCode()
        {
            return this.ProjectContext == null ? 89 : this.ProjectContext.GetHashCode()
                ^ (base.GetHashCode() * 79);
        }
 
        /// <inheritdoc/>
        public override string ToString()
        {
            var result = base.ToString();
            if (this.ProjectContext != null)
            {
                result += "|" + this.ProjectContext.Label + "|" + this.ProjectContext.Id;
            }
 
            return result;
        }
    }
}