﻿#region Licence
// The MIT License (MIT)
// 
// Copyright (c) 2013 Eric Ruan
// 
// 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;

namespace cmstar.Serialization.Json.Contracts
{
    /// <summary>
    /// The contract for booleans.
    /// </summary>
    public class BooleanContract : JsonContract
    {
        /// <summary>
        /// Initializes a new instance of <see cref="BooleanContract"/>.
        /// </summary>
        public BooleanContract()
            : base(typeof(bool))
        {
        }

        protected override void DoWrite(
            JsonWriter writer,
            JsonSerializingState state,
            IJsonContractResolver contractResolver,
            object obj)
        {
            writer.WriteBooleanValue((bool)obj);
        }

        protected override object DoRead(JsonReader reader, JsonDeserializingState state)
        {
            reader.Read();

            switch (reader.Token)
            {
                case JsonToken.BooleanValue:
                    return (bool)reader.Value;

                case JsonToken.StringValue:
                case JsonToken.NumberValue:
                    try
                    {
                        return Convert.ToBoolean(reader.Value);
                    }
                    catch (FormatException ex)
                    {
                        throw JsonContractErrors.CannotConverType(reader.Value, typeof(bool), ex);
                    }

                case JsonToken.NullValue:
                    if (state.NullValueHandling == JsonDeserializationNullValueHandling.AsDefaultValue)
                        return false;

                    throw JsonContractErrors.CannotConverType(null, typeof(double), null);

                default:
                    throw JsonContractErrors.UnexpectedToken(JsonToken.BooleanValue, reader.Token);
            }
        }
    }
}
