// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
#nullable enable
 
using System.Linq;
using Microsoft.Extensions.Configuration;
 
namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal;
 
internal sealed class ConfigSectionClone
{
    public ConfigSectionClone(IConfigurationSection configSection)
    {
        Value = configSection.Value;
 
        // GetChildren() should return an empty IEnumerable instead of null, but we guard against it since it's a public interface.
        var children = configSection.GetChildren() ?? Enumerable.Empty<IConfigurationSection>();
        Children = children.ToDictionary(child => child.Key, child => new ConfigSectionClone(child));
    }
 
    public string? Value { get; }
 
    public Dictionary<string, ConfigSectionClone> Children { get; }
 
    public override bool Equals(object? obj)
    {
        if (!(obj is ConfigSectionClone other))
        {
            return false;
        }
 
        if (Value != other.Value || Children.Count != other.Children.Count)
        {
            return false;
        }
 
        foreach (var kvp in Children)
        {
            if (!other.Children.TryGetValue(kvp.Key, out var child))
            {
                return false;
            }
 
            if (kvp.Value != child)
            {
                return false;
            }
        }
 
        return true;
    }
 
    public override int GetHashCode() => HashCode.Combine(Value, Children.Count);
 
    public static bool operator ==(ConfigSectionClone lhs, ConfigSectionClone rhs) => lhs is null ? rhs is null : lhs.Equals(rhs);
    public static bool operator !=(ConfigSectionClone lhs, ConfigSectionClone rhs) => !(lhs == rhs);
}