﻿#region License

// Copyright (c) 2007 James Newton-King
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.

#endregion

using System.Collections.Generic;
using uWebshop.Newtonsoft.Json.Linq;
using uWebshop.Newtonsoft.Json.Utilities;

namespace uWebshop.Newtonsoft.Json.Schema
{
	/// <summary>
	/// Contains the JSON schema extension methods.
	/// </summary>
	public static class Extensions
	{
		/// <summary>
		/// Determines whether the <see cref="JToken"/> is valid.
		/// </summary>
		/// <param name="source">The source <see cref="JToken"/> to test.</param>
		/// <param name="schema">The schema to test with.</param>
		/// <returns>
		/// 	<c>true</c> if the specified <see cref="JToken"/> is valid; otherwise, <c>false</c>.
		/// </returns>
		public static bool IsValid(this JToken source, JsonSchema schema)
		{
			bool valid = true;
			source.Validate(schema, (sender, args) => { valid = false; });
			return valid;
		}

		/// <summary>
		/// Determines whether the <see cref="JToken"/> is valid.
		/// </summary>
		/// <param name="source">The source <see cref="JToken"/> to test.</param>
		/// <param name="schema">The schema to test with.</param>
		/// <param name="errorMessages">When this method returns, contains any error messages generated while validating. </param>
		/// <returns>
		/// 	<c>true</c> if the specified <see cref="JToken"/> is valid; otherwise, <c>false</c>.
		/// </returns>
		public static bool IsValid(this JToken source, JsonSchema schema, out IList<string> errorMessages)
		{
			IList<string> errors = new List<string>();

			source.Validate(schema, (sender, args) => errors.Add(args.Message));

			errorMessages = errors;
			return (errorMessages.Count == 0);
		}

		/// <summary>
		/// Validates the specified <see cref="JToken"/>.
		/// </summary>
		/// <param name="source">The source <see cref="JToken"/> to test.</param>
		/// <param name="schema">The schema to test with.</param>
		public static void Validate(this JToken source, JsonSchema schema)
		{
			source.Validate(schema, null);
		}

		/// <summary>
		/// Validates the specified <see cref="JToken"/>.
		/// </summary>
		/// <param name="source">The source <see cref="JToken"/> to test.</param>
		/// <param name="schema">The schema to test with.</param>
		/// <param name="validationEventHandler">The validation event handler.</param>
		public static void Validate(this JToken source, JsonSchema schema, ValidationEventHandler validationEventHandler)
		{
			ValidationUtils.ArgumentNotNull(source, "source");
			ValidationUtils.ArgumentNotNull(schema, "schema");

			using (var reader = new JsonValidatingReader(source.CreateReader()))
			{
				reader.Schema = schema;
				if (validationEventHandler != null)
					reader.ValidationEventHandler += validationEventHandler;

				while (reader.Read())
				{
				}
			}
		}
	}
}