// ------------------------------------------------------------------------------
//  Copyright (c) Microsoft Corporation.  All Rights Reserved.  Licensed under the MIT License.  See License in the project root for license information.
// ------------------------------------------------------------------------------

namespace Microsoft.Graph
{
    using System;

    using Newtonsoft.Json;

    /// <summary>
    /// The Date Converter.
    /// </summary>
    public class DateConverter : JsonConverter
    {
        /// <summary>
        /// Check if the given object can be converted into a Date.
        /// </summary>
        /// <param name="objectType">The type of the object.</param>
        /// <returns>True if the object is a Date type.</returns>
        public override bool CanConvert(Type objectType)
        {
            if (objectType == typeof(Date))
            {
                return true;
            }

            return false;
        }

        /// <summary>
        /// Converts the JSON object into a Date object
        /// </summary>
        /// <param name="reader">The <see cref="JsonWriter"/> to read from.</param>
        /// <param name="objectType">The object type.</param>
        /// <param name="existingValue">The existing value.</param>
        /// <param name="serializer">The serializer to convert the object with.</param>
        /// <returns></returns>
        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
        {
            try
            {
                var dateTime = (DateTime)serializer.Deserialize(reader, typeof(DateTime));

                return new Date(dateTime);
            }
            catch (JsonSerializationException serializationException)
            {
                throw new ServiceException(
                    new Error
                    {
                        Code = ErrorConstants.Codes.GeneralException,
                        Message = ErrorConstants.Messages.UnableToDeserializeDate,
                    },
                    serializationException);
            }
        }

        /// <summary>
        /// Writes the JSON representation of the object.
        /// </summary>
        /// <param name="writer">The <see cref="JsonWriter"/> to write to.</param>
        /// <param name="value">The value.</param>
        /// <param name="serializer">The calling serializer.</param>
        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
        {
            var date = value as Date;

            if (date != null)
            {
                writer.WriteValue(date.ToString());
            }
            else
            {
                throw new ServiceException(
                    new Error
                    {
                        Code = ErrorConstants.Codes.GeneralException,
                        Message = ErrorConstants.Messages.InvalidTypeForDateConverter,
                    });
            }
        }
    }
}