using System;

namespace Newtonsoft.Json
{
  /// <summary>
  /// Instructs the <see cref="JsonSerializer"/> to always serialize the member with the specified name.
  /// </summary>
  [AttributeUsage(AttributeTargets.Field | AttributeTargets.Property, AllowMultiple = false)]
  public sealed class JsonPropertyAttribute : Attribute
  {
    // yuck. can't set nullable properties on an attribute in C#
    // have to use this approach to get an unset default state
    internal NullValueHandling? _nullValueHandling;
    internal DefaultValueHandling? _defaultValueHandling;
    internal ReferenceLoopHandling? _referenceLoopHandling;
    internal ObjectCreationHandling? _objectCreationHandling;
    internal TypeNameHandling? _typeNameHandling;
    internal bool? _isReference;

    /// <summary>
    /// Gets or sets the null value handling used when serializing this property.
    /// </summary>
    /// <value>The null value handling.</value>
    public NullValueHandling NullValueHandling
    {
      get { return _nullValueHandling ?? default(NullValueHandling); }
      set { _nullValueHandling = value; }
    }

    /// <summary>
    /// Gets or sets the default value handling used when serializing this property.
    /// </summary>
    /// <value>The default value handling.</value>
    public DefaultValueHandling DefaultValueHandling
    {
      get { return _defaultValueHandling ?? default(DefaultValueHandling); }
      set { _defaultValueHandling = value; }
    }

    /// <summary>
    /// Gets or sets the reference loop handling used when serializing this property.
    /// </summary>
    /// <value>The reference loop handling.</value>
    public ReferenceLoopHandling ReferenceLoopHandling
    {
      get { return _referenceLoopHandling ?? default(ReferenceLoopHandling); }
      set { _referenceLoopHandling = value; }
    }

    /// <summary>
    /// Gets or sets the object creation handling used when deserializing this property.
    /// </summary>
    /// <value>The object creation handling.</value>
    public ObjectCreationHandling ObjectCreationHandling
    {
      get { return _objectCreationHandling ?? default(ObjectCreationHandling); }
      set { _objectCreationHandling = value; }
    }

    /// <summary>
    /// Gets or sets the type name handling used when serializing this property.
    /// </summary>
    /// <value>The type name handling.</value>
    public TypeNameHandling TypeNameHandling
    {
      get { return _typeNameHandling ?? default(TypeNameHandling); }
      set { _typeNameHandling = value; }
    }

    /// <summary>
    /// Gets or sets whether this property's value is serialized as a reference.
    /// </summary>
    /// <value>Whether this property's value is serialized as a reference.</value>
    public bool IsReference
    {
      get { return _isReference ?? default(bool); }
      set { _isReference = value; }
    }

    /// <summary>
    /// Gets or sets the name of the property.
    /// </summary>
    /// <value>The name of the property.</value>
    public string PropertyName { get; set; }

    /// <summary>
    /// Gets or sets a value indicating whether this property is required.
    /// </summary>
    /// <value>
    /// 	A value indicating whether this property is required.
    /// </value>
    public Required Required { get; set; }

    /// <summary>
    /// Initializes a new instance of the <see cref="JsonPropertyAttribute"/> class.
    /// </summary>
    public JsonPropertyAttribute()
    {
    }

    /// <summary>
    /// Initializes a new instance of the <see cref="JsonPropertyAttribute"/> class with the specified name.
    /// </summary>
    /// <param name="propertyName">Name of the property.</param>
    public JsonPropertyAttribute(string propertyName)
    {
      PropertyName = propertyName;
    }
  }
}