using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace PCRobot.Utils
{
    /// <summary>
    /// ProtoBuf-Net扩展方法类
    /// </summary>
    public static class ProtoBufExtension
    {
        /// <summary>
        /// 将对象实例序列化为字符串（Base64编码格式）——ProtoBuf
        /// </summary>
        /// <typeparam name="T">对象类型</typeparam>
        /// <param name="obj">对象实例</param>
        /// <returns>字符串（Base64编码格式）</returns>
        public static string SerializeToString_PB<T>(this T obj)
        {
            using (MemoryStream ms = new MemoryStream())
            {
                ProtoBuf.Serializer.Serialize(ms, obj);
                return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);
            }
        }

        /// <summary>
        /// 将字符串（Base64编码格式）反序列化为对象实例——ProtoBuf
        /// </summary>
        /// <typeparam name="T">对象类型</typeparam>
        /// <param name="txt">字符串（Base64编码格式）</param>
        /// <returns>对象实例</returns>
        public static T DeserializeFromString_PB<T>(this string txt)
        {
            byte[] arr = Convert.FromBase64String(txt);
            using (MemoryStream ms = new MemoryStream(arr))
                return ProtoBuf.Serializer.Deserialize<T>(ms);
        }

        /// <summary>
        /// 将对象实例序列化为字节数组——ProtoBuf
        /// </summary>
        /// <typeparam name="T">对象类型</typeparam>
        /// <param name="obj">对象实例</param>
        /// <returns>字节数组</returns>
        public static byte[] SerializeToByteAry_PB<T>(this T obj)
        {
            using (MemoryStream ms = new MemoryStream())
            {
                ProtoBuf.Serializer.Serialize(ms, obj);
                return ms.ToArray();
            }
        }

        /// <summary>
        /// 将字节数组反序列化为对象实例——ProtoBuf
        /// </summary>
        /// <typeparam name="T">对象类型</typeparam>
        /// <param name="arr">字节数组</param>
        /// <returns></returns>
        public static T DeserializeFromByteAry_PB<T>(this byte[] arr)
        {
            try
            {
                using (MemoryStream ms = new MemoryStream(arr))
                    return ProtoBuf.Serializer.Deserialize<T>(ms);
            }
            catch (Exception)
            {
                return default(T);
            }
        }

        /// <summary>
        /// 将对象实例序列化为二进制文件——ProtoBuf
        /// </summary>
        /// <typeparam name="T">对象类型</typeparam>
        /// <param name="obj">对象实例</param>
        /// <param name="path">文件路径（目录+文件名）</param>
        public static void SerializeToFile_PB<T>(this T obj, string path)
        {
            using (var file = File.Create(path))
            {
                ProtoBuf.Serializer.Serialize(file, obj);
            }
        }

        /// <summary>
        /// 将二进制文件反序列化为对象实例——ProtoBuf
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="path"></param>
        /// <returns></returns>
        public static T DeserializeFromFile_PB<T>(this string path)
        {
            using (var file = File.OpenRead(path))
            {
                return ProtoBuf.Serializer.Deserialize<T>(file);
            }
        }
    }
}