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

namespace ModVersionChecker.utils
{
    public class TimeUtils
    {
        public static long GetUnixTimeMillis(DateTime? dateTime)
        {
            DateTime dt = dateTime ?? DateTime.UtcNow;
            return (long)(dt - new DateTime(1970, 1, 1)).TotalMilliseconds;
        }

        public static DateTime FromUnixTimeMillis(long unixTimeMillis)
        {
            return new DateTime(1970, 1, 1).AddMilliseconds(unixTimeMillis);
        }

        public static string ToFriendlyTime(long millisecods)
        {
            DateTime dateTime = FromUnixTimeMillis(millisecods);
            return ToFriendlyTime(dateTime);
        }

        public static string ToFriendlyTime(DateTime dateTime)
        {
            // Use UTC for consistency with LiteDB if needed
            DateTime now = DateTime.UtcNow;
            

            TimeSpan span = now - dateTime;

            // Handle future dates (optional)
            if (span.TotalSeconds < 0)
                return "In the future";

            if (span.TotalSeconds < 60)
                return $"{(int)span.TotalSeconds} seconds ago";
            if (span.TotalMinutes < 60)
                return $"{(int)span.TotalMinutes} minute{(span.TotalMinutes < 2 ? "" : "s")} ago";
            if (span.TotalHours < 24)
                return $"{(int)span.TotalHours} hour{(span.TotalHours < 2 ? "" : "s")} ago";
            if (span.TotalDays < 30)
                return $"{(int)span.TotalDays} day{(span.TotalDays < 2 ? "" : "s")} ago";
            if (span.TotalDays < 365)
                return $"{(int)(span.TotalDays / 30)} month{(span.TotalDays / 30 < 2 ? "" : "s")} ago";

            return $"{(int)(span.TotalDays / 365)} year{(span.TotalDays / 365 < 2 ? "" : "s")} ago";
        }
    }
}