// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Collections.Generic;
using System.Diagnostics;
 
namespace Microsoft.Extensions.AI;
 
/// <summary>Provides usage details about a request/response.</summary>
[DebuggerDisplay("{DebuggerDisplay,nq}")]
public class UsageDetails
{
    /// <summary>Gets or sets the number of tokens in the input.</summary>
    public int? InputTokenCount { get; set; }
 
    /// <summary>Gets or sets the number of tokens in the output.</summary>
    public int? OutputTokenCount { get; set; }
 
    /// <summary>Gets or sets the total number of tokens used to produce the response.</summary>
    public int? TotalTokenCount { get; set; }
 
    /// <summary>Gets or sets additional properties for the usage details.</summary>
    public AdditionalPropertiesDictionary? AdditionalProperties { get; set; }
 
    /// <summary>Gets a string representing this instance to display in the debugger.</summary>
    [DebuggerBrowsable(DebuggerBrowsableState.Never)]
    internal string DebuggerDisplay
    {
        get
        {
            List<string> parts = [];
 
            if (InputTokenCount is int input)
            {
                parts.Add($"{nameof(InputTokenCount)} = {input}");
            }
 
            if (OutputTokenCount is int output)
            {
                parts.Add($"{nameof(OutputTokenCount)} = {output}");
            }
 
            if (TotalTokenCount is int total)
            {
                parts.Add($"{nameof(TotalTokenCount)} = {total}");
            }
 
            if (AdditionalProperties is { } additionalProperties)
            {
                foreach (var entry in additionalProperties)
                {
                    parts.Add($"{entry.Key} = {entry.Value}");
                }
            }
 
            return string.Join(", ", parts);
        }
    }
}