using System;
using System.Buffers.Text;
using System.IO;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Text;

namespace SmallInjectorDemo
{
    /// <summary>
    /// Static helper class for generating random numbers.
    /// </summary>
    public static class Helper
    {
        /// <summary>
        /// Encode Base64 string
        /// </summary>
        public static string EncodeBase64String(this Guid guid)
        {
            Span<byte> guidBytes = stackalloc byte[16];
            Span<byte> encodedBytes = stackalloc byte[24];

            MemoryMarshal.TryWrite(guidBytes, ref guid); // write bytes from the Guid
            Base64.EncodeToUtf8(guidBytes, encodedBytes, out _, out _);

            // skip the last two bytes as these will be '==' padding
            var final = Encoding.UTF8.GetString(encodedBytes.Slice(0, 22));

            return final;
        }

        /// <summary>
        /// Write method string.
        /// </summary>
        /// <param name="clock">The current clock</param>
        /// <param name="id">id of the object</param>
        /// <param name="memberName">member name</param>
        /// <param name="filepath">file path</param>
        /// <returns></returns>
        public static string WriteMethodString(IClock clock, string id, [CallerMemberName] string memberName = null, [CallerFilePath] string filepath = null)
        {
            var classname = Path.GetFileNameWithoutExtension(filepath);
            return $"[{clock.CurrentDateTime}] {classname}.{memberName?.TrimStart('.')}".PadRight(30) + $"Id: {id}";
        }
    }
}