using System;
using System.Collections.Generic;
using System.Linq;
using System.Security;
using System.Threading.Tasks;
using Discord;
using Kehyeedra3.Services.Models;

namespace Kehyeedra3.Services
{
    public class ReminderService
    {
        static IDMChannel LanChannel;
        private static async Task SendReminderAsync(Reminder reminder)
        {
        try {
                var dmchannel = await Bot._bot.GetUser(reminder.UserId).CreateDMChannelAsync();
                if (dmchannel != null)
                {
                    ulong m = (reminder.Send - reminder.Created) / 60;
                    ulong h = 0;
                    ulong d = 0;
                    while (m > 59)
                    {
                        h += 1;
                        m -= 60;
                    }
                    while (h > 23)
                    {
                        d += 1;
                        h -= 24;
                    }
                    string remin = "";
                    if (d > 0)
                    {
                        remin += $" {d} day";
                        if (d > 1)
                        {
                            remin += $"s";
                        }
                    }
                    if (h > 0)
                    {
                        remin += $" {h} hour";
                        if (h > 1)
                        {
                            remin += $"s";
                        }
                    }
                    if (m > 0)
                    {
                        remin += $" {m} minute";
                        if (m > 1)
                        {
                            remin += $"s";
                        }
                    }
                    await dmchannel.SendMessageAsync($"**Reminder from{remin} ago:**\n\n''{reminder.Message}''");
                }
            }
            catch { if (LanChannel is null)
                {
                    IUser Lan = Bot._bot.GetUser(242040333309837327);
                    LanChannel = await Lan.CreateDMChannelAsync();
                }

                await LanChannel.SendMessageAsync($"Time of error        ^\n" +
                $"A fucky wucky has occurred, uwu\nFix wemindew sewwis dimwiwt" +
                $"\nThis was the reminder: {reminder.Id} \nto: {reminder.UserId} \ntime: {reminder.Send.FromYeedraStamp()}"); }
        }
            
        public async Task Tick()
        {
            while (true)
            {
                if(Bot.IsReady)
				{
                    using (var Database = new ApplicationDbContextFactory().CreateDbContext())
                    {
                        var reminders = Database.Reminders.ToList();
                        if (Database.Reminders.Any() && Bot._bot != null && Bot._bot.ConnectionState == Discord.ConnectionState.Connected)
                        {
                            bool hasChanged = false;
                            foreach (var x in reminders)
                            {
                                if (x.Send <= DateTime.UtcNow.ToYeedraStamp())
                                {
                                    await SendReminderAsync(x).ConfigureAwait(false);
                                    Database.Reminders.Remove(x);
                                    hasChanged = true;
                                }
                            }

                            if (hasChanged)
                            {
                                await Database.SaveChangesAsync().ConfigureAwait(false);
                            }
                        }
                    }
                }
                await Task.Delay(250);
            }
        }
    }
}