nadekobot/src/NadekoBot/Modules/Gambling/SlotCommands.cs

using System.Text;
using NadekoBot.Db.Models;
using NadekoBot.Modules.Gambling.Services;
using NadekoBot.Modules.Gambling.Common;
using SixLabors.Fonts;
using Image = SixLabors.ImageSharp.Image;
using SixLabors.ImageSharp.Processing;
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Drawing.Processing;
using SixLabors.ImageSharp.PixelFormats;
using Color = SixLabors.ImageSharp.Color;

namespace NadekoBot.Modules.Gambling;

public partial class Gambling
{
    [Group]
    public class SlotCommands : GamblingSubmodule<GamblingService>
    {
        private static long _totalBet;
        private static long _totalPaidOut;

        private static readonly HashSet<ulong> _runningUsers = new HashSet<ulong>();

        //here is a payout chart
        //https://lh6.googleusercontent.com/-i1hjAJy_kN4/UswKxmhrbPI/AAAAAAAAB1U/82wq_4ZZc-Y/DE6B0895-6FC1-48BE-AC4F-14D1B91AB75B.jpg
        //thanks to judge for helping me with this

        private readonly IImageCache _images;
        private FontProvider _fonts;
        private readonly DbService _db;

        public SlotCommands(IDataCache data,
            FontProvider fonts, DbService db,
            GamblingConfigService gamb) : base(gamb)
        {
            _images = data.LocalImages;
            _fonts = fonts;
            _db = db;
        }

        public sealed class SlotMachine
        {
            public const int MaxValue = 5;

            static readonly List<Func<int[], int>> _winningCombos = new List<Func<int[], int>>()
            {
                //three flowers
                arr => arr.All(a=>a==MaxValue) ? 30 : 0,
                //three of the same
                arr => !arr.Any(a => a != arr[0]) ? 10 : 0,
                //two flowers
                arr => arr.Count(a => a == MaxValue) == 2 ? 4 : 0,
                //one flower
                arr => arr.Any(a => a == MaxValue) ? 1 : 0,
            };

            public static SlotResult Pull()
            {
                var numbers = new int[3];
                for (var i = 0; i < numbers.Length; i++)
                {
                    numbers[i] = new NadekoRandom().Next(0, MaxValue + 1);
                }
                var multi = 0;
                foreach (var t in _winningCombos)
                {
                    multi = t(numbers);
                    if (multi != 0)
                        break;
                }

                return new(numbers, multi);
            }

            public struct SlotResult
            {
                public int[] Numbers { get; }
                public int Multiplier { get; }
                public SlotResult(int[] nums, int multi)
                {
                    Numbers = nums;
                    Multiplier = multi;
                }
            }
        }

        [NadekoCommand, Aliases]
        [OwnerOnly]
        public async Task SlotStats()
        {
            //i remembered to not be a moron
            var paid = _totalPaidOut;
            var bet = _totalBet;

            if (bet <= 0)
                bet = 1;

            var embed = _eb.Create()
                .WithOkColor()
                .WithTitle("Slot Stats")
                .AddField("Total Bet", bet.ToString(), true)
                .AddField("Paid Out", paid.ToString(), true)
                .WithFooter($"Payout Rate: {paid * 1.0 / bet * 100:f4}%");

            await ctx.Channel.EmbedAsync(embed).ConfigureAwait(false);
        }

        [NadekoCommand, Aliases]
        [OwnerOnly]
        public async Task SlotTest(int tests = 1000)
        {
            if (tests <= 0)
                return;
            //multi vs how many times it occured
            var dict = new Dictionary<int, int>();
            for (var i = 0; i < tests; i++)
            {
                var res = SlotMachine.Pull();
                if (dict.ContainsKey(res.Multiplier))
                    dict[res.Multiplier] += 1;
                else
                    dict.Add(res.Multiplier, 1);
            }

            var sb = new StringBuilder();
            const int bet = 1;
            var payout = 0;
            foreach (var key in dict.Keys.OrderByDescending(x => x))
            {
                sb.AppendLine($"x{key} occured {dict[key]} times. {dict[key] * 1.0f / tests * 100}%");
                payout += key * dict[key];
            }
            await SendConfirmAsync("Slot Test Results", sb.ToString(),
                footer: $"Total Bet: {tests * bet} | Payout: {payout * bet} | {payout * 1.0f / tests * 100}%").ConfigureAwait(false);
        }

        [NadekoCommand, Aliases]
        public async Task Slot(ShmartNumber amount)
        {
            if (!_runningUsers.Add(ctx.User.Id))
                return;
               
            try
            {
                if (!await CheckBetMandatory(amount).ConfigureAwait(false))
                    return;
                    
                await ctx.Channel.TriggerTypingAsync().ConfigureAwait(false);

                var result = await _service.SlotAsync(ctx.User.Id, amount);

                if (result.Error != GamblingError.None)
                {
                    if (result.Error == GamblingError.NotEnough)
                    {
                        await ReplyErrorLocalizedAsync(strs.not_enough(CurrencySign));
                    }

                    return;
                }

                Interlocked.Add(ref _totalBet, amount);
                Interlocked.Add(ref _totalPaidOut, result.Won);

                long ownedAmount;
                await using (var uow = _db.GetDbContext())
                {
                    ownedAmount = uow.Set<DiscordUser>()
                        .FirstOrDefault(x => x.UserId == ctx.User.Id)
                        ?.CurrencyAmount ?? 0;
                }

                using (var bgImage = Image.Load<Rgba32>(_images.SlotBackground, out var format))
                {
                    var numbers = new int[3];
                    result.Rolls.CopyTo(numbers, 0);

                    Color fontColor = _config.Slots.CurrencyFontColor;
                       
                    bgImage.Mutate(x => x.DrawText(new()
                        {
                            TextOptions = new()
                            {
                                HorizontalAlignment = HorizontalAlignment.Center,
                                VerticalAlignment = VerticalAlignment.Center,
                                WrapTextWidth = 140,
                            }
                        }, result.Won.ToString(), _fonts.DottyFont.CreateFont(65), fontColor,
                        new(227, 92)));

                    var bottomFont = _fonts.DottyFont.CreateFont(50);
                       
                    bgImage.Mutate(x => x.DrawText(new()
                        {
                            TextOptions = new()
                            {
                                HorizontalAlignment = HorizontalAlignment.Center,
                                VerticalAlignment = VerticalAlignment.Center,
                                WrapTextWidth = 135,
                            }
                        }, amount.ToString(), bottomFont, fontColor,
                        new(129, 472)));

                    bgImage.Mutate(x => x.DrawText(new()
                        {
                            TextOptions = new()
                            {
                                HorizontalAlignment = HorizontalAlignment.Center,
                                VerticalAlignment = VerticalAlignment.Center,
                                WrapTextWidth = 135,
                            }
                        }, ownedAmount.ToString(), bottomFont, fontColor,
                        new(325, 472)));
                    //sw.PrintLap("drew red text");

                    for (var i = 0; i < 3; i++)
                    {
                        using (var img = Image.Load(_images.SlotEmojis[numbers[i]]))
                        {
                            bgImage.Mutate(x => x.DrawImage(img, new Point(148 + 105 * i, 217), 1f));
                        }
                    }

                    var msg = GetText(strs.better_luck);
                    if (result.Multiplier > 0)
                    {
                        if (result.Multiplier == 1f)
                            msg = GetText(strs.slot_single(CurrencySign, 1));
                        else if (result.Multiplier == 4f)
                            msg = GetText(strs.slot_two(CurrencySign, 4));
                        else if (result.Multiplier == 10f)
                            msg = GetText(strs.slot_three(10));
                        else if (result.Multiplier == 30f)
                            msg = GetText(strs.slot_jackpot(30));
                    }

                    await using (var imgStream = bgImage.ToStream())
                    {
                        await ctx.Channel.SendFileAsync(imgStream,
                            filename: "result.png",
                            text: Format.Bold(ctx.User.ToString()) + " " + msg).ConfigureAwait(false);
                    }
                }
            }
            finally
            {
                var _ = Task.Run(async () =>
                {
                    await Task.Delay(1000).ConfigureAwait(false);
                    _runningUsers.Remove(ctx.User.Id);
                });
            }
        }
    }
}