// 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.Collections.Generic;
using System.Text.Json.Serialization;
 
/// <summary>
/// Class which represents a text document text range.
///
/// See the <see href="https://microsoft.github.io/language-server-protocol/specifications/specification-current/#range">Language Server Protocol specification</see> for additional information.
/// </summary>
internal sealed class Range : IEquatable<Range>
{
    /// <summary>
    /// Gets or sets the text start position.
    /// </summary>
    [JsonPropertyName("start")]
    [JsonRequired]
    public Position Start
    {
        get;
        set;
    }
 
    /// <summary>
    /// Gets or sets the text end position.
    /// </summary>
    [JsonPropertyName("end")]
    [JsonRequired]
    public Position End
    {
        get;
        set;
    }
 
    public static bool operator ==(Range? value1, Range? value2)
    {
        if (ReferenceEquals(value1, value2))
        {
            return true;
        }
 
        // Is null?
        if (ReferenceEquals(null, value2))
        {
            return false;
        }
 
        return value1?.Equals(value2) ?? false;
    }
 
    public static bool operator !=(Range? value1, Range? value2)
    {
        return !(value1 == value2);
    }
 
    /// <inheritdoc/>
    public override bool Equals(object obj)
    {
        return this.Equals(obj as Range);
    }
 
    /// <inheritdoc/>
    public bool Equals(Range? other)
    {
        return other != null &&
               EqualityComparer<Position>.Default.Equals(this.Start, other.Start) &&
               EqualityComparer<Position>.Default.Equals(this.End, other.End);
    }
 
    /// <inheritdoc/>
    public override int GetHashCode()
    {
        var hashCode = -1676728671;
        hashCode = (hashCode * -1521134295) + EqualityComparer<Position>.Default.GetHashCode(this.Start);
        hashCode = (hashCode * -1521134295) + EqualityComparer<Position>.Default.GetHashCode(this.End);
        return hashCode;
    }
}