using System;

namespace SharpCompress.Common.Arj.Headers;

public class DosDateTime
{
    public DateTime DateTime { get; }

    public DosDateTime(long dosValue)
    {
        // Ensure only the lower 32 bits are used
        int value = unchecked((int)(dosValue & 0xFFFFFFFF));

        var date = (value >> 16) & 0xFFFF;
        var time = value & 0xFFFF;

        var day = date & 0x1F;
        var month = (date >> 5) & 0x0F;
        var year = ((date >> 9) & 0x7F) + 1980;

        var second = (time & 0x1F) * 2;
        var minute = (time >> 5) & 0x3F;
        var hour = (time >> 11) & 0x1F;

        try
        {
            DateTime = new DateTime(year, month, day, hour, minute, second);
        }
        catch
        {
            DateTime = DateTime.MinValue;
        }
    }

    public override string ToString() =>
        DateTime.ToString("yyyy-MM-dd HH:mm:ss", Constants.DefaultCultureInfo);
}
