// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System;
using System.ComponentModel;
using System.Reflection;
using System.Text.Json.Nodes;
using System.Threading;
 
namespace Microsoft.Extensions.AI;
 
/// <summary>
/// Provides options for configuring the behavior of <see cref="AIJsonUtilities"/> JSON schema creation functionality.
/// </summary>
public sealed record class AIJsonSchemaCreateOptions
{
    /// <summary>
    /// Gets the default options instance.
    /// </summary>
    public static AIJsonSchemaCreateOptions Default { get; } = new AIJsonSchemaCreateOptions();
 
    /// <summary>
    /// Gets a callback that is invoked for every schema that is generated within the type graph.
    /// </summary>
    public Func<AIJsonSchemaCreateContext, JsonNode, JsonNode>? TransformSchemaNode { get; init; }
 
    /// <summary>
    /// Gets a callback that is invoked for every parameter in the <see cref="MethodBase"/> provided to
    /// <see cref="AIJsonUtilities.CreateFunctionJsonSchema"/> in order to determine whether it should
    /// be included in the generated schema.
    /// </summary>
    /// <remarks>
    /// By default, when <see cref="IncludeParameter"/> is <see langword="null"/>, all parameters other
    /// than those of type <see cref="CancellationToken"/> are included in the generated schema.
    /// The delegate is not invoked for <see cref="CancellationToken"/> parameters.
    /// </remarks>
    public Func<ParameterInfo, bool>? IncludeParameter { get; init; }
 
    /// <summary>
    /// Gets a callback that is invoked for each parameter in the <see cref="MethodBase"/> provided to
    /// <see cref="AIJsonUtilities.CreateFunctionJsonSchema"/> to obtain a description for the parameter.
    /// </summary>
    /// <remarks>
    /// The delegate receives a <see cref="ParameterInfo"/> instance and returns a string describing
    /// the parameter. If <see langword="null"/>, or if the delegate returns <see langword="null"/>,
    /// the description will be sourced from the <see cref="MethodBase"/> metadata (like <see cref="DescriptionAttribute"/>),
    /// if available.
    /// </remarks>
    public Func<ParameterInfo, string?>? ParameterDescriptionProvider { get; init; }
 
    /// <summary>
    /// Gets a <see cref="AIJsonSchemaTransformOptions"/> governing transformations on the JSON schema after it has been generated.
    /// </summary>
    public AIJsonSchemaTransformOptions? TransformOptions { get; init; }
 
    /// <summary>
    /// Gets a value indicating whether to include the $schema keyword in created schemas.
    /// </summary>
    public bool IncludeSchemaKeyword { get; init; }
}