using System;
using System.Globalization;
using NewLife.Reflection;
using NewLife.Serialization;

namespace NewLife.JT808.Protocols;
    /// <summary>BCD时间序列化特性</summary>
    [AttributeUsage(AttributeTargets.Property | AttributeTargets.Field)]
    public class BCDTimeAttribute : AccessorAttribute
    {
        /// <summary>长度</summary>
        public Int32 Length { get; set; }

        /// <summary>格式化字符串</summary>
        public String Format { get; set; } = "yyMMddHHmmss";

        /// <summary>>BCD时间序列化</summary>
        /// <param name="length"></param>
        /// <param name="format"></param>
        public BCDTimeAttribute(Int32 length, String format)
        {
            Length = length;
            Format = format;
        }

        /// <summary>从数据流中读取消息</summary>
        /// <param name="formatter">序列化</param>
        /// <param name="context">上下文</param>
        /// <returns>是否成功</returns>
        public override Boolean Read(IFormatterX formatter, AccessorContext context)
        {
            if (formatter is Binary bn)
            {
                var str = bn.ReadBCD(Length);
                if (DateTime.TryParseExact(str, Format, null, DateTimeStyles.None, out var dt))
                    context.Value.SetValue(context.Member, dt);

                return true;
            }

            return false;
        }

        /// <summary>把消息写入到数据流中</summary>
        /// <param name="formatter">序列化</param>
        /// <param name="context">上下文</param>
        public override Boolean Write(IFormatterX formatter, AccessorContext context)
        {
            if (formatter is Binary bn)
            {
                var dt = (DateTime)context.Value.GetValue(context.Member);
                var str = dt.ToString(Format);
                bn.WriteBCD(str, Length);

                return true;
            }

            return false;
        }
    }