using System.Runtime.InteropServices;
using System.Text;

namespace AmrControl
{
    public class AppHelper
    {
        private static IConfiguration _config;

        public AppHelper(IConfiguration configuration)
        {
            _config = configuration;
        }

        /// <summary>
        /// 读取指定节点的字符串
        /// </summary>
        /// <param name="sessions"></param>
        /// <returns></returns>
        public static string ReadAppSettings(params string[] sessions)
        {
            try
            {
                if (sessions.Any())
                {
                    return _config[string.Join(":", sessions)];
                }
            }
            catch
            {
                return "";
            }
            return "";
        }

        /// <summary>
        /// 读取实体信息
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="session"></param>
        /// <returns></returns>
        public static List<T> ReadAppSettings<T>(params string[] session)
        {
            List<T> list = new List<T>();
            _config.Bind(string.Join(":", session), list);
            return list;
        }

        public static string BytesToString(byte[] array)
        {
            if (array == null)
                return "";

            StringBuilder strBuilder = new StringBuilder();
            foreach (var item in array)
            {
                strBuilder.Append(item.ToString() + " ");
            }
            return strBuilder.ToString().TrimEnd();
        }

        public static T BytesToStruct<T>(byte[] array)
        {
            if (array == null)
                return default(T);

            int size = Marshal.SizeOf<T>();
            IntPtr ptr = Marshal.AllocHGlobal(size);
            if(array.Length <= size)
            {
                Marshal.Copy(array,0,ptr,array.Length);
            }
            else
            {
                Marshal.Copy(array, 0, ptr, size);
            }
            T t = Marshal.PtrToStructure<T>(ptr);
            Marshal.FreeHGlobal(ptr);
            return t;
        }
    }
   
}