using System;
using System.IO;

namespace CPF.Windows.Json
{
    /// <summary>
    ///      KoobooJson Serializer
    /// </summary>
    public class JsonSerializer
    {
        private static readonly JsonSerializerOption defaultSerializerOption = new JsonSerializerOption();
        private static readonly JsonDeserializeOption defaultDeserializeOption = new JsonDeserializeOption();


        /// <summary>
        ///     Serialize objects into JSON strings
        /// </summary>
        /// <typeparam name="T">Value type</typeparam>
        /// <param name="value">Value</param>
        /// <param name="option">Serialize option</param>
        /// <returns>JSON strings</returns>
        public static string ToJson<T>(T value, JsonSerializerOption option = null)
        {
            var handler = new JsonSerializerHandler(new System.Text.StringBuilder())
            {
                Option = option?? defaultSerializerOption
            };
            Serializer.FormattingProvider<T>.Get(value, handler);
            return handler.ToString();
        }

        /// <summary>
        ///     Serialize Object from the StreamWriter
        /// </summary>
        /// <typeparam name="T">Value type</typeparam>
        /// <param name="value">Value</param>
        /// <param name="streamWriter">Stream</param>
        /// <param name="option">Serialize option</param>
        public static void ToJson<T>(T value, StreamWriter streamWriter, JsonSerializerOption option = null)
        {
            streamWriter.Flush();//posting set 0
            bool isAutoFlush = false;
            if (streamWriter.AutoFlush)
            {
                isAutoFlush = true;
                streamWriter.AutoFlush = false;
            }
            var handler = new JsonSerializerHandler(streamWriter)
            {
                Option = option ?? defaultSerializerOption
            };
            Serializer.FormattingProvider<T>.Get(value, handler);
            if(isAutoFlush)
                streamWriter.AutoFlush = true;
        }


        /// <summary>
        ///     Converting Json strings to objects
        /// </summary>
        /// <typeparam name="T">Types converted</typeparam>
        /// <param name="json">Json string</param>
        /// <param name="option">Json Deserialize Option</param>
        /// <returns>Object</returns>
        public static T ToObject<T>(string json, JsonDeserializeOption option=null)
        {
            var handler = new JsonDeserializeHandler
            {
                Option = option?? defaultDeserializeOption
            };
            return Deserialize.ResolveProvider<T>.Convert(json, handler);
        }

        /// <summary>
        ///     Converting Json strings to objects
        /// </summary>
        /// <param name="json">Json string</param>
        /// <param name="type">Types converted</param>
        /// <param name="option">Json Deserialize Option</param>
        /// <returns>Object</returns>
        public static object ToObject(string json, Type type, JsonDeserializeOption option=null)
        {
            var handler = new JsonDeserializeHandler
            {
                Option = option ?? defaultDeserializeOption
            };
            return Deserialize.DeserializeObjectJump.GetThreadSafetyJumpFunc(json, type, handler);
        }

        /// <summary>
        ///     Deserializes JSON from the StreamReader
        /// </summary>
        /// <typeparam name="T">Types converted</typeparam>
        /// <param name="streamReader">Stream</param>
        /// <param name="option">Json Deserialize Option</param>
        /// <returns>Object</returns>
        [Obsolete("Current convection processing does not achieve the meaning of the stream itself. Errors occur when the length of the deserialized character exceeds the length of StreamReader's charBuffer. This method will be revised in the next version.", false)]
        public static T ToObject<T>(StreamReader streamReader, JsonDeserializeOption option = null)
        {
            var handler = new JsonDeserializeHandler
            {
                Option = option ?? defaultDeserializeOption
            };
            return Deserialize.ResolveProvider<T>.Convert(streamReader, handler);
        }

        /// <summary>
        ///     Deserializes JSON from the StreamReader
        /// </summary>
        /// <param name="streamReader">Stream</param>
        /// <param name="type">Types converted</param>
        /// <param name="option">Json Deserialize Option</param>
        /// <returns>Object</returns>
        [Obsolete("Current convection processing does not achieve the meaning of the stream itself. Errors occur when the length of the deserialized character exceeds the length of StreamReader's charBuffer. This method will be revised in the next version.", false)]
        public static object ToObject(StreamReader streamReader, Type type, JsonDeserializeOption option = null)
        {
            var handler = new JsonDeserializeHandler
            {
                Option = option ?? defaultDeserializeOption
            };
            return Deserialize.DeserializeObjectJump.GetThreadSafetyJumpFunc(streamReader, type, handler);
        }

    }
}