Added .fish command

src/EllieBot.Tests/FishTests.cs

@@ -0,0 +1,88 @@
+// using System;
+// using System.Collections.Generic;
+// using System.Diagnostics;
+// using System.IO;
+// using System.Linq;
+// using Ellie.Common;
+// using EllieBot.Modules.Games;
+// using NUnit.Framework;
+//
+// namespace EllieBot.Tests;
+//
+// public class FishTests
+// {
+//     [Test]
+//     public void TestWeather()
+//     {
+//         var fs = new FishService(null, null);
+//
+//         var rng = new Random();
+//
+//         // output = @"ro+dD:bN0uVqV3ZOAv6r""EFeA'A]u]uSyz2Qd'r#0Vf:5zOX\VgSsF8LgRCL/uOW";
+//         while (true)
+//         {
+//             var output = "";
+//             for (var i = 0; i < 64; i++)
+//             {
+//                 var c = (char)rng.Next(33, 123);
+//                 output += c;
+//             }
+//
+//             output = "";
+//             var weathers = new List<FishingWeather>();
+//             for (var i = 0; i < 1_000_000; i++)
+//             {
+//                 var w = fs.GetWeather(DateTime.UtcNow.AddHours(6 * i), output);
+//                 weathers.Add(w);
+//             }
+//
+//             var vals = weathers.GroupBy(x => x)
+//                 .ToDictionary(x => x.Key, x => x.Count());
+//
+//             var str = weathers.Select(x => (int)x).Join("");
+//             var maxLength = MaxLength(str);
+//
+//             if (maxLength < 12)
+//             {
+//                 foreach (var v in vals)
+//                 {
+//                     Console.WriteLine($"{v.Key}: {v.Value}");
+//                 }
+//
+//                 Console.WriteLine(output);
+//                 Console.WriteLine(maxLength);
+//
+//                 File.WriteAllText("data.txt", weathers.Select(x => (int)x).Join(""));
+//
+//                 break;
+//             }
+//         }
+//     }
+//
+//     // string with same characters
+//     static int MaxLength(String s)
+//     {
+//         int ans = 1, temp = 1;
+//
+//         // Traverse the string
+//         for (int i = 1; i < s.Length; i++)
+//         {
+//             // If character is same as
+//             // previous increment temp value
+//             if (s[i] == s[i - 1])
+//             {
+//                 ++temp;
+//             }
+//             else
+//             {
+//                 ans = Math.Max(ans, temp);
+//                 temp = 1;
+//             }
+//         }
+//
+//         ans = Math.Max(ans, temp);
+//
+//         // Return the required answer
+//         return ans;
+//     }
+// }

src/EllieBot.Tests/KwumTests.cs

@@ -1,4 +1,5 @@
-using Ellie.Common;
+using System;
+using Ellie.Common;
 using NUnit.Framework;
 
 namespace EllieBot.Tests
@@ -120,5 +121,12 @@ namespace EllieBot.Tests
             num = new kwum(int.MaxValue);
             Assert.AreEqual("3zzzzzz", num.ToString());
         }
+
+        [Test]
+        public void TestPower()
+        {
+            var num = new kwum((int)Math.Pow(32, 2));
+            Assert.AreEqual("322", num.ToString());
+        }
     }
 }

src/EllieBot/Db/EllieContext.cs

@@ -74,6 +74,9 @@ public abstract class EllieContext : DbContext
 
     protected override void OnModelCreating(ModelBuilder modelBuilder)
     {
+        // load all entities from current assembly
+        modelBuilder.ApplyConfigurationsFromAssembly(typeof(EllieContext).Assembly);
+
         #region Notify
 
         modelBuilder.Entity<Notify>(e =>

src/EllieBot/Migrations/PostgreSql/20250114060020_fishes.cs

@@ -0,0 +1,39 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+
+#nullable disable
+
+namespace EllieBot.Migrations.PostgreSql
+{
+    /// <inheritdoc />
+    public partial class fishes : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "fishcatch",
+                columns: table => new
+                {
+                    id = table.Column<int>(type: "integer", nullable: false)
+                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
+                    userid = table.Column<decimal>(type: "numeric(20,0)", nullable: false),
+                    fishid = table.Column<int>(type: "integer", nullable: false),
+                    count = table.Column<int>(type: "integer", nullable: false),
+                    maxstars = table.Column<int>(type: "integer", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("pk_fishcatch", x => x.id);
+                    table.UniqueConstraint("ak_fishcatch_userid_fishid", x => new { x.userid, x.fishid });
+                });
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "fishcatch");
+        }
+    }
+}

src/EllieBot/Migrations/Sqlite/20250114055850_fishes.cs

@@ -0,0 +1,38 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace EllieBot.Migrations
+{
+    /// <inheritdoc />
+    public partial class fishes : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "FishCatch",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "INTEGER", nullable: false)
+                        .Annotation("Sqlite:Autoincrement", true),
+                    UserId = table.Column<ulong>(type: "INTEGER", nullable: false),
+                    FishId = table.Column<int>(type: "INTEGER", nullable: false),
+                    Count = table.Column<int>(type: "INTEGER", nullable: false),
+                    MaxStars = table.Column<int>(type: "INTEGER", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_FishCatch", x => x.Id);
+                    table.UniqueConstraint("AK_FishCatch_UserId_FishId", x => new { x.UserId, x.FishId });
+                });
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "FishCatch");
+        }
+    }
+}

src/EllieBot/Modules/Games/Fish/CaptchaService.cs

@@ -0,0 +1,55 @@
+using SixLabors.Fonts;
+using SixLabors.Fonts.Unicode;
+using SixLabors.ImageSharp;
+using SixLabors.ImageSharp.Drawing.Processing;
+using SixLabors.ImageSharp.PixelFormats;
+using SixLabors.ImageSharp.Processing;
+using Color = SixLabors.ImageSharp.Color;
+
+namespace EllieBot.Modules.Games;
+
+public sealed class CaptchaService(FontProvider fonts) : IEService
+{
+    private readonly EllieRandom _rng = new();
+
+    public Image<Rgba32> GetPasswordImage(string password)
+    {
+        var img = new Image<Rgba32>(50, 24);
+
+        var font = fonts.NotoSans.CreateFont(22);
+        var outlinePen = new SolidPen(Color.Black, 0.5f);
+        var strikeoutRun = new RichTextRun
+        {
+            Start = 0,
+            End = password.GetGraphemeCount(),
+            Font = font,
+            StrikeoutPen = new SolidPen(Color.White, 4),
+            TextDecorations = TextDecorations.Strikeout
+        };
+
+        // draw password on the image
+        img.Mutate(x =>
+        {
+            DrawTextExtensions.DrawText(x,
+                new RichTextOptions(font)
+                {
+                    HorizontalAlignment = HorizontalAlignment.Center,
+                    VerticalAlignment = VerticalAlignment.Center,
+                    FallbackFontFamilies = fonts.FallBackFonts,
+                    Origin = new(25, 12),
+                    TextRuns = [strikeoutRun]
+                },
+                password,
+                Brushes.Solid(Color.White),
+                outlinePen);
+        });
+
+        return img;
+    }
+
+    public string GeneratePassword()
+    {
+        var num = _rng.Next((int)Math.Pow(31, 2), (int)Math.Pow(32, 3));
+        return new kwum(num).ToString();
+    }
+}

src/EllieBot/Modules/Games/Fish/FishCatch.cs

@@ -0,0 +1,27 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+using System.ComponentModel.DataAnnotations;
+
+namespace EllieBot.Modules.Games;
+
+public sealed class FishCatch
+{
+    [Key]
+    public int Id { get; set; }
+    public ulong UserId { get; set; }
+    public int FishId { get; set; }
+    public int Count { get; set; }
+    public int MaxStars { get; set; }
+}
+
+public sealed class FishCatchConfiguration : IEntityTypeConfiguration<FishCatch>
+{
+    public void Configure(EntityTypeBuilder<FishCatch> builder)
+    {
+        builder.HasAlternateKey(x => new
+        {
+            x.UserId,
+            x.FishId
+        });
+    }
+}

src/EllieBot/Modules/Games/Fish/FishChance.cs

@@ -0,0 +1,8 @@
+namespace EllieBot.Modules.Games;
+
+public sealed class FishChance
+{
+    public int Fish { get; set; } = 75;
+    public int Trash { get; set; } = 20;
+    public int Nothing { get; set; } = 0;
+}

src/EllieBot/Modules/Games/Fish/FishCommands.cs

@@ -0,0 +1,292 @@
+using System.Text;
+using Format = Discord.Format;
+
+namespace EllieBot.Modules.Games;
+
+public partial class Games
+{
+    public class FishCommands(
+        FishService fs,
+        FishConfigService fcs,
+        IBotCache cache,
+        CaptchaService service) : EllieModule
+    {
+        private TypedKey<bool> FishingWhitelistKey(ulong userId)
+            => new($"fishingwhitelist:{userId}");
+
+        [Cmd]
+        public async Task Fish()
+        {
+            var cRes = await cache.GetAsync(FishingWhitelistKey(ctx.User.Id));
+            if (cRes.TryPickT1(out _, out _))
+            {
+                var password = await GetUserCaptcha(ctx.User.Id);
+                var img = service.GetPasswordImage(password);
+                using var stream = await img.ToStreamAsync();
+                var captcha = await Response()
+                                    .File(stream, "timely.png")
+                                    .SendAsync();
+
+                try
+                {
+                    var userInput = await GetUserInputAsync(ctx.User.Id, ctx.Channel.Id);
+                    if (userInput?.ToLowerInvariant() != password?.ToLowerInvariant())
+                    {
+                        return;
+                    }
+
+                    // whitelist the user for 30 minutes
+                    await cache.AddAsync(FishingWhitelistKey(ctx.User.Id), true, TimeSpan.FromMinutes(30));
+                    // reset the password
+                    await ClearUserCaptcha(ctx.User.Id);
+                }
+                finally
+                {
+                    _ = captcha.DeleteAsync();
+                }
+            }
+
+
+            var fishResult = await fs.FishAsync(ctx.User.Id, ctx.Channel.Id);
+            if (fishResult.TryPickT1(out _, out var fishTask))
+            {
+                return;
+            }
+
+            var currentWeather = fs.GetCurrentWeather();
+            var currentTod = fs.GetTime();
+            var spot = fs.GetSpot(ctx.Channel.Id);
+
+            var msg = await Response()
+                            .Embed(CreateEmbed()
+                                   .WithPendingColor()
+                                   .WithAuthor(ctx.User)
+                                   .WithDescription(GetText(strs.fish_waiting))
+                                   .AddField(GetText(strs.fish_spot), GetSpotEmoji(spot) + " " + spot.ToString(), true)
+                                   .AddField(GetText(strs.fish_weather),
+                                       GetWeatherEmoji(currentWeather) + " " + currentWeather,
+                                       true)
+                                   .AddField(GetText(strs.fish_tod), GetTodEmoji(currentTod) + " " + currentTod, true))
+                            .SendAsync();
+
+            var res = await fishTask;
+            if (res is null)
+            {
+                await Response().Error(strs.fish_nothing).SendAsync();
+                return;
+            }
+
+
+            await Response()
+                  .Embed(CreateEmbed()
+                         .WithOkColor()
+                         .WithAuthor(ctx.User)
+                         .WithDescription(GetText(strs.fish_caught(Format.Bold(res.Fish.Name))))
+                         .AddField(GetText(strs.fish_quality), GetStarText(res.Stars, res.Fish.Stars), true)
+                         .AddField(GetText(strs.desc), res.Fish.Fluff, true)
+                         .WithThumbnailUrl(res.Fish.Image))
+                  .SendAsync();
+
+            await msg.DeleteAsync();
+        }
+
+        [Cmd]
+        public async Task FishSpot()
+        {
+            var ws = fs.GetWeatherForPeriods(7);
+            var spot = fs.GetSpot(ctx.Channel.Id);
+            var time = fs.GetTime();
+
+            await Response()
+                  .Embed(CreateEmbed()
+                         .WithOkColor()
+                         .WithDescription(GetText(strs.fish_weather_duration(fs.GetWeatherPeriodDuration())))
+                         .AddField(GetText(strs.fish_spot), GetSpotEmoji(spot) + " " + spot, true)
+                         .AddField(GetText(strs.fish_tod), GetTodEmoji(time) + " " + time, true)
+                         .AddField(GetText(strs.fish_weather_forecast),
+                             ws.Select(x => GetWeatherEmoji(x)).Join(""),
+                             true))
+                  .SendAsync();
+        }
+
+        [Cmd]
+        public async Task Fishlist(int page = 1)
+        {
+            if (--page < 0)
+                return;
+
+            var fishes = await fs.GetAllFish();
+
+            Log.Information(fishes.Count.ToString());
+            var catches = await fs.GetUserCatches(ctx.User.Id);
+
+            var catchDict = catches.ToDictionary(x => x.FishId, x => x);
+
+            await Response()
+                  .Paginated()
+                  .Items(fishes)
+                  .PageSize(9)
+                  .CurrentPage(page)
+                  .Page((fs, i) =>
+                  {
+                      var eb = CreateEmbed()
+                          .WithOkColor();
+
+                      foreach (var f in fs)
+                      {
+                          if (catchDict.TryGetValue(f.Id, out var c))
+                          {
+                              eb.AddField(f.Name,
+                                  GetFishEmoji(f, c.Count)
+                                  + " "
+                                  + GetSpotEmoji(f.Spot)
+                                  + GetTodEmoji(f.Time)
+                                  + GetWeatherEmoji(f.Weather)
+                                  + "\n"
+                                  + GetStarText(c.MaxStars, f.Stars)
+                                  + "\n"
+                                  + Format.Italics(f.Fluff),
+                                  true);
+                          }
+                          else
+                          {
+                              eb.AddField("?", GetFishEmoji(null, 0) + "\n" + GetStarText(0, f.Stars), true);
+                          }
+                      }
+
+                      return eb;
+                  })
+                  .SendAsync();
+        }
+
+        private string GetFishEmoji(FishData? fish, int count)
+        {
+            if (fish is null)
+                return "";
+
+            return fish.Emoji + " x" + count;
+        }
+
+        private string GetSpotEmoji(FishingSpot? spot)
+        {
+            if (spot is not FishingSpot fs)
+                return string.Empty;
+
+            var conf = fcs.Data;
+
+            return conf.SpotEmojis[(int)fs];
+        }
+
+        private string GetTodEmoji(FishingTime? fishTod)
+        {
+            return fishTod switch
+            {
+                FishingTime.Night => "🌑",
+                FishingTime.Dawn => "🌅",
+                FishingTime.Dusk => "🌆",
+                FishingTime.Day => "☀️",
+                _ => ""
+            };
+        }
+
+        private string GetWeatherEmoji(FishingWeather? w)
+            => w switch
+            {
+                FishingWeather.Rain => "🌧️",
+                FishingWeather.Snow => "❄️",
+                FishingWeather.Storm => "⛈️",
+                FishingWeather.Clear => "☀️",
+                _ => ""
+            };
+
+        private string GetStarText(int resStars, int fishStars)
+        {
+            if (resStars == fishStars)
+            {
+                return MultiplyStars(fcs.Data.StarEmojis[^1], fishStars);
+            }
+
+            var c = fcs.Data;
+            var starsp1 = MultiplyStars(c.StarEmojis[resStars], resStars);
+            var starsp2 = MultiplyStars(c.StarEmojis[0], fishStars - resStars);
+
+            return starsp1 + starsp2;
+        }
+
+        private string MultiplyStars(string starEmoji, int count)
+        {
+            var sb = new StringBuilder();
+
+            for (var i = 0; i < count; i++)
+            {
+                sb.Append(starEmoji);
+            }
+
+            return sb.ToString();
+        }
+
+        private static TypedKey<string> CaptchaPasswordKey(ulong userId)
+            => new($"timely_password:{userId}");
+
+        private async Task<string> GetUserCaptcha(ulong userId)
+        {
+            var pw = await cache.GetOrAddAsync(CaptchaPasswordKey(userId),
+                () =>
+                {
+                    var password = service.GeneratePassword();
+                    return Task.FromResult(password)!;
+                });
+
+            return pw!;
+        }
+
+        private ValueTask<bool> ClearUserCaptcha(ulong userId)
+            => cache.RemoveAsync(CaptchaPasswordKey(userId));
+    }
+}
+
+//
+// public sealed class UserFishStats
+// {
+//     [Key]
+//     public int Id { get; set; }
+//
+//     public ulong UserId { get; set; }
+//
+//     public ulong CommonCatches { get; set; }
+//     public ulong RareCatches { get; set; }
+//     public ulong VeryRareCatches { get; set; }
+//     public ulong EpicCatches { get; set; }
+//
+//     public ulong CommonMaxCatches { get; set; }
+//     public ulong RareMaxCatches { get; set; }
+//     public ulong VeryRareMaxCatches { get; set; }
+//     public ulong EpicMaxCatches { get; set; }
+//
+//     public int TotalStars { get; set; }
+// }
+
+public enum FishingSpot
+{
+    Ocean,
+    River,
+    Lake,
+    Swamp,
+    Reef
+}
+
+public enum FishingTime
+{
+    Night,
+    Dawn,
+    Day,
+    Dusk
+}
+
+public enum FishingWeather
+{
+    Clear,
+    Rain,
+    Storm,
+    Snow
+}

src/EllieBot/Modules/Games/Fish/FishConfig.cs

@@ -0,0 +1,19 @@
+using Cloneable;
+using EllieBot.Common.Yml;
+
+namespace EllieBot.Modules.Games;
+
+[Cloneable]
+public sealed partial class FishConfig : ICloneable<FishConfig>
+{
+    [Comment("DO NOT CHANGE")]
+    public int Version { get; set; } = 1;
+
+    public string WeatherSeed { get; set; } = string.Empty;
+    public List<string> StarEmojis { get; set; } = new();
+    public List<string> SpotEmojis { get; set; } = new();
+    public FishChance Chance { get; set; } = new FishChance();
+
+    public List<FishData> Fish { get; set; } = new();
+    public List<FishData> Trash { get; set; } = new();
+}

src/EllieBot/Modules/Games/Fish/FishConfigService.cs

@@ -0,0 +1,19 @@
+using EllieBot.Common.Configs;
+
+namespace EllieBot.Modules.Games;
+
+public sealed class FishConfigService : ConfigServiceBase<FishConfig>
+{
+    private static string FILE_PATH = "data/fish.yml";
+    private static readonly TypedKey<FishConfig> _changeKey = new("config.fish.updated");
+
+    public override string Name
+        => "fishing";
+
+    public FishConfigService(
+        IConfigSeria serializer,
+        IPubSub pubSub)
+        : base(FILE_PATH, serializer, pubSub, _changeKey)
+    {
+    }
+}

src/EllieBot/Modules/Games/Fish/FishData.cs

@@ -0,0 +1,16 @@
+namespace EllieBot.Modules.Games;
+
+public class FishData
+{
+    public required int Id { get; set; }
+    public required string Name { get; set; }
+    public FishingWeather? Weather { get; set; }
+    public FishingSpot? Spot { get; set; }
+    public FishingTime? Time { get; set; }
+    public required double Chance { get; set; }
+    public required int Stars { get; set; }
+    public required string Fluff { get; set; }
+    public List<string>? Condition { get; set; }
+    public string? Image { get; init; }
+    public string? Emoji { get; set; }
+}

src/EllieBot/Modules/Games/Fish/FishResult.cs

@@ -0,0 +1,9 @@
+namespace EllieBot.Modules.Games;
+
+public sealed class FishResult
+{
+    public required FishData Fish { get; init; }
+    public int Stars { get; init; }
+}
+
+public readonly record struct AlreadyFishing;

src/EllieBot/Modules/Games/Fish/FishService.cs

@@ -0,0 +1,318 @@
+using LinqToDB;
+using LinqToDB.EntityFrameworkCore;
+using System.Security.Cryptography;
+
+namespace EllieBot.Modules.Games;
+
+public sealed class FishService(FishConfigService fcs, IBotCache cache, DbService db) : IEService
+{
+    private Random _rng = new Random();
+
+    private static TypedKey<bool> FishingKey(ulong userId)
+        => new($"fishing:{userId}");
+
+    public async Task<OneOf.OneOf<Task<FishResult?>, AlreadyFishing>> FishAsync(ulong userId, ulong channelId)
+    {
+        var duration = _rng.Next(1, 9);
+
+        if (!await cache.AddAsync(FishingKey(userId), true, TimeSpan.FromSeconds(duration), overwrite: false))
+        {
+            return new AlreadyFishing();
+        }
+
+        return TryFishAsync(userId, channelId, duration);
+    }
+
+    private async Task<FishResult?> TryFishAsync(ulong userId, ulong channelId, int duration)
+    {
+        var conf = fcs.Data;
+        await Task.Delay(TimeSpan.FromSeconds(duration));
+
+        // first roll whether it's fish, trash or nothing
+        var totalChance = conf.Chance.Fish + conf.Chance.Trash + conf.Chance.Nothing;
+        var typeRoll = _rng.NextDouble() * totalChance;
+
+        if (typeRoll < conf.Chance.Nothing)
+        {
+            return null;
+        }
+
+        var items = typeRoll < conf.Chance.Nothing + conf.Chance.Fish
+            ? conf.Fish
+            : conf.Trash;
+
+        return await FishAsyncInternal(userId, channelId, items);
+    }
+
+    private async Task<FishResult?> FishAsyncInternal(ulong userId, ulong channelId, List<FishData> items)
+    {
+        var filteredItems = new List<FishData>();
+
+        var loc = GetSpot(channelId);
+        var time = GetTime();
+        var w = GetWeather(DateTime.UtcNow);
+
+        foreach (var item in items)
+        {
+            if (item.Condition is { Count: > 0 })
+            {
+                if (!item.Condition.Any(x => channelId.ToString().EndsWith(x)))
+                {
+                    continue;
+                }
+            }
+
+
+            if (item.Spot is not null && item.Spot != loc)
+                continue;
+
+            if (item.Time is not null && item.Time != time)
+                continue;
+
+            if (item.Weather is not null && item.Weather != w)
+                continue;
+
+            filteredItems.Add(item);
+            Log.Information("Added {FishName} to filtered items", item.Name);
+        }
+
+        var maxSum = filteredItems.Sum(x => x.Chance * 100);
+
+
+        var roll = _rng.NextDouble() * maxSum;
+        Log.Information("Roll: {Roll}, MaxSum: {MaxSum}", roll, maxSum);
+
+        FishResult? caught = null;
+
+        var curSum = 0d;
+        foreach (var i in filteredItems)
+        {
+            curSum += i.Chance * 100;
+
+            if (roll < curSum)
+            {
+                caught = new FishResult()
+                {
+                    Fish = i,
+                    Stars = GetRandomStars(i.Stars),
+                };
+                break;
+            }
+        }
+
+        if (caught is not null)
+        {
+            await using var uow = db.GetDbContext();
+
+            await uow.GetTable<FishCatch>()
+                     .InsertOrUpdateAsync(() => new FishCatch()
+                     {
+                         UserId = userId,
+                         FishId = caught.Fish.Id,
+                         MaxStars = caught.Stars,
+                         Count = 1
+                     },
+                         (old) => new()
+                         {
+                             Count = old.Count + 1,
+                             MaxStars = Math.Max((int)old.MaxStars, caught.Stars),
+                         },
+                         () => new()
+                         {
+                             FishId = caught.Fish.Id,
+                             UserId = userId
+                         });
+
+            return caught;
+        }
+
+        Log.Error(
+            "Something went wrong in the fish command, no fish with sufficient chance was found, Roll: {Roll}, MaxSum: {MaxSum}",
+            roll,
+            maxSum);
+
+        return null;
+    }
+
+    public FishingSpot GetSpot(ulong channelId)
+    {
+        var cid = (channelId >> 22 >> 8) & 1;
+
+        return cid switch
+        {
+            < 1 => FishingSpot.Reef,
+            < 3 => FishingSpot.River,
+            < 5 => FishingSpot.Lake,
+            < 7 => FishingSpot.Swamp,
+            _ => FishingSpot.Ocean,
+        };
+    }
+
+    public FishingTime GetTime()
+    {
+        var hour = DateTime.UtcNow.Hour % 12;
+
+        if (hour < 3)
+            return FishingTime.Night;
+
+        if (hour < 4)
+            return FishingTime.Dawn;
+
+        if (hour < 11)
+            return FishingTime.Day;
+
+        return FishingTime.Dusk;
+
+    }
+
+    private const int WEATHER_PERIODS_PER_DAY = 12;
+
+    public IReadOnlyList<FishingWeather> GetWeatherForPeriods(int periods)
+    {
+        var now = DateTime.UtcNow;
+        var result = new FishingWeather[periods];
+
+        for (var i = 0; i < periods; i++)
+        {
+            result[i] = GetWeather(now.AddHours(i * GetWeatherPeriodDuration()));
+        }
+
+        return result;
+    }
+
+    public FishingWeather GetCurrentWeather()
+        => GetWeather(DateTime.UtcNow);
+
+    public FishingWeather GetWeather(DateTime time)
+        => GetWeather(time, fcs.Data.WeatherSeed);
+
+    private FishingWeather GetWeather(DateTime time, string seed)
+    {
+        var year = time.Year;
+        var dayOfYear = time.DayOfYear;
+        var hour = time.Hour;
+
+        var num = (year * 100_000) + (dayOfYear * 100) + (hour / GetWeatherPeriodDuration());
+
+        Span<byte> dataArray = stackalloc byte[4];
+        BitConverter.TryWriteBytes(dataArray, num);
+
+        Span<byte> seedArray = stackalloc byte[seed.Length];
+        for (var index = 0; index < seed.Length; index++)
+        {
+            var c = seed[index];
+            seedArray[index] = (byte)c;
+        }
+
+        Span<byte> arr = stackalloc byte[dataArray.Length + seedArray.Length];
+
+        dataArray.CopyTo(arr);
+        seedArray.CopyTo(arr[dataArray.Length..]);
+
+        using var algo = SHA512.Create();
+
+        Span<byte> hash = stackalloc byte[64];
+        algo.TryComputeHash(arr, hash, out _);
+
+        byte reduced = 0;
+        foreach (var u in hash)
+            reduced ^= u;
+
+        var r = reduced % 16;
+
+        // return (FishingWeather)r;
+        return r switch
+        {
+            < 5 => FishingWeather.Clear,
+            < 9 => FishingWeather.Rain,
+            < 13 => FishingWeather.Storm,
+            _ => FishingWeather.Snow
+        };
+    }
+
+
+    /// <summary>
+    /// Returns a random number of stars between 1 and maxStars
+    /// if maxStars == 1, returns 1
+    /// if maxStars == 2, returns 1 (66%) or 2 (33%)
+    /// if maxStars == 3, returns 1 (65%) or 2 (25%) or 3 (10%)
+    /// if maxStars == 5, returns 1 (40%) or 2 (30%) or 3 (15%) or 4 (10%) or 5 (5%)
+    /// </summary>
+    /// <param name="maxStars">Max Number of stars to generate</param>
+    /// <returns>Random number of stars</returns>
+    private int GetRandomStars(int maxStars)
+    {
+        if (maxStars == 1)
+            return 1;
+
+        if (maxStars == 2)
+        {
+            // 66% chance of 1 star, 33% chance of 2 stars
+            return _rng.NextDouble() < 0.66 ? 1 : 2;
+        }
+
+        if (maxStars == 3)
+        {
+            // 65% chance of 1 star, 25% chance of 2 stars, 10% chance of 3 stars
+            var r = _rng.NextDouble();
+            if (r < 0.65)
+                return 1;
+            if (r < 0.9)
+                return 2;
+            return 3;
+        }
+
+        if (maxStars == 4)
+        {
+            // this should never happen
+            // 50% chance of 1 star, 25% chance of 2 stars, 18% chance of 3 stars, 7% chance of 4 stars
+            var r = _rng.NextDouble();
+            if (r < 0.5)
+                return 1;
+            if (r < 0.7)
+                return 2;
+            if (r < 0.85)
+                return 3;
+            return 4;
+        }
+
+        if (maxStars == 5)
+        {
+            // 40% chance of 1 star, 30% chance of 2 stars, 15% chance of 3 stars, 10% chance of 4 stars, 5% chance of 5 stars
+            var r = _rng.NextDouble();
+            if (r < 0.4)
+                return 1;
+            if (r < 0.7)
+                return 2;
+            if (r < 0.9)
+                return 3;
+            if (r < 0.95)
+                return 4;
+            return 5;
+        }
+
+        return 1;
+    }
+
+    public int GetWeatherPeriodDuration()
+        => 24 / WEATHER_PERIODS_PER_DAY;
+
+    public async Task<List<FishData>> GetAllFish()
+    {
+        await Task.Yield();
+
+        var conf = fcs.Data;
+        return conf.Fish.Concat(conf.Trash).ToList();
+    }
+
+    public async Task<List<FishCatch>> GetUserCatches(ulong userId)
+    {
+        await using var ctx = db.GetDbContext();
+
+        var catches = await ctx.GetTable<FishCatch>()
+                               .Where(x => x.UserId == userId)
+                               .ToListAsyncLinqToDB();
+
+        return catches;
+    }
+}

src/EllieBot/_common/Abstractions/EllieRandom.cs

@@ -54,13 +54,9 @@ public sealed class EllieRandom : Random
     {
         var bytes = new byte[sizeof(double)];
         _rng.GetBytes(bytes);
-        return Math.Abs((BitConverter.ToDouble(bytes, 0) / double.MaxValue) + 1);
+        return Math.Abs((BitConverter.ToDouble(bytes, 0) / (double.MaxValue + 1)));
     }
 
     public override double NextDouble()
-    {
-        var bytes = new byte[sizeof(double)];
-        _rng.GetBytes(bytes);
-        return BitConverter.ToDouble(bytes, 0);
-    }
+        => Sample();
 }

src/EllieBot/data/aliases.yml

@@ -1559,4 +1559,17 @@ notifyclear:
   - notifclr
 winlb:
   - winlb
-  - wins
+  - wins
+fish:
+  - fish
+  - fi
+fishlist:
+  - fishlist
+  - fili
+  - fishes
+  - fil
+  - fishlist
+fishspot:
+  - fishspot 
+  - fisp
+  - fish?

src/EllieBot/data/fish.yml

@@ -0,0 +1,43 @@
+# DO NOT CHANGE
+version: 1
+weatherSeed: "w%29';^eGE)9oWHM(aI9I;%1[.r^z2ZS7ShV,l')o(e%#\"hVzb>oxQq^`.&/7srh"
+chance:
+  fish: 80
+  trash: 15
+  nothing: 5
+starEmojis:
+  - <:emptystar:1326838565786877962>
+  - <:onestar:1326838456739168361>
+  - <:twostar:1326838508198957107>
+  - <:threestar:1326838525601251429>
+  - <:fourstar:1326838552520294462>
+spotEmojis:
+  - <:ocean:1328519734953771120>
+  - <:river:1328519754620862504>
+  - <:lake:1328315260561788989>
+  - <:swamp:1328519766083633224>
+  - <:reef:1328519744646545421>
+fish:
+  - name: Bass
+    id: 0
+    weather:
+    spot:
+    time:
+    chance: 100
+    stars: 4
+    fluff: Very common.
+    condition:
+    image: https://cdn.nadeko.bot/fish/bass.png
+    emoji: "<:bass:1328520376892002386>"
+trash:
+  - name: Plastic Bag
+    id: 1002
+    weather:
+    spot:
+    time:
+    chance: 50
+    stars: 4
+    fluff: "Trophy of your contribution to the environment."
+    condition:
+    image: https://cdn.nadeko.bot/fish/plasticbag.png
+    emoji: "<:plasticbag:1328520895454515211>"

src/EllieBot/data/strings/commands/commands.en-US.yml

@@ -4904,4 +4904,30 @@ winlb:
     - '5'
   params:
     - page:
-        desc: "The optional page to display."
+        desc: "The optional page to display."
+fish:
+  desc: |-
+    Attempt to catch a fish.
+    Different fish live in different places, at different times and during different times of the day.
+  ex:
+    - ''
+  params:
+    - { }
+fishlist:
+  desc: |-
+    Look at your fish catalogue.
+    Shows how many of each fish you caught and what was the highest quality.
+    For each caught fish, it also shows its required spot, time of day and weather.
+  ex:
+    - ''
+  params:
+    - { }
+    - page:
+        desc: "The optional page to display."
+fishspot:
+  desc: |-
+    Shows information about the current fish spot, weather and time.
+  ex:
+    - ''
+  params:
+    - { }

src/EllieBot/data/strings/responses/responses.en-US.json

@@ -1159,5 +1159,15 @@
   "notify_desc_removerolerew": "Triggers when a user loses a role as a reward for reaching a level (xprew).",
   "notify_desc_not_found": "No description found for this notify event. Please report this.",
   "winlb": "Biggest Wins Leaderboard",
-  "no_banner": "No banner set."
+  "no_banner": "No banner set.",
+  "fish_nothing": "You caught nothing, try again.",
+  "fish_caught": "You caught a {0}!",
+  "fish_quality": "Quality",
+  "fish_spot": "Spot",
+  "fish_waiting": "Fishing...",
+  "fish_weather": "Weather",
+  "fish_weather_duration": "Each weather period lasts for {0} hours.",
+  "fish_weather_current": "Current",
+  "fish_weather_forecast": "Forecast",
+  "fish_tod": "Time of Day"
 }