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

public static class AssemblyExtensions
{
    /// <summary>
    /// Gets the assembly build date according to the visual studio extension (auto version increment).
    /// The scheme of the assembly version should be {Major}.{Minor}.{BuildNumber}.{YYDDD}
    /// The revision number contains the number of years since 2000 and day in year.
    /// </summary>
    /// <param name="asm">The assembly.</param>
    /// <returns></returns>
    public static DateTime GetBuildDate(this Assembly asm)
    {
        var version = asm.GetName().Version;

        String revision = version.Revision.ToString();

        if (revision.Length == 5)
        {
            int years = int.Parse(new String(revision.Take(2).ToArray()));
            int day = int.Parse(new String(revision.Skip(2).ToArray()));

            return new DateTime(2000, 1, 1).AddYears(years).AddDays(day - 1);
        }
        else
        {
            return new DateTime(2000, 1, 1)
                        .AddDays(version.Revision);
        }
    }

    public static IEnumerable<Type> GetLoadableTypes(this Assembly assembly)
    {
        try
        {
            return assembly.GetTypes();
        }
        catch (ReflectionTypeLoadException e)
        {
            return e.Types.Where(t => t != null);
        }
    }
}