WIP: Add config synchronization via CSync

Range is [0..100] but it's relative to total/sum. The algorithm guards
against "all set to zero" scenario.

MuzikaGromche/MuzikaGromche.csproj

@@ -15,6 +15,8 @@
         <PackageReference Include="BepInEx.PluginInfoProps" Version="1.*"/>
         <PackageReference Include="UnityEngine.Modules" Version="2022.3.9" IncludeAssets="compile"/>
         <PackageReference Include="BepInEx.AssemblyPublicizer.MSBuild" Version="0.4.1" PrivateAssets="all" />
+        <!-- Publicize internal methods, so we could generate config entries for tracks at runtime instead of generating code at compile time -->
+        <PackageReference Include="Sigurd.BepInEx.CSync" Version="5.0.1" Publicize="true" />
     </ItemGroup>
 
     <ItemGroup>

MuzikaGromche/Plugin.cs

@@ -4,6 +4,9 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Security.Cryptography;
 using BepInEx;
+using BepInEx.Configuration;
+using CSync.Extensions;
+using CSync.Lib;
 using HarmonyLib;
 using UnityEngine;
 using UnityEngine.Networking;
@@ -11,8 +14,11 @@ using UnityEngine.Networking;
 namespace MuzikaGromche
 {
     [BepInPlugin(PluginInfo.PLUGIN_GUID, PluginInfo.PLUGIN_NAME, PluginInfo.PLUGIN_VERSION)]
+    [BepInDependency("com.sigurd.csync", "5.0.1")]
     public class Plugin : BaseUnityPlugin
     {
+        internal new static Config Config { get; private set; } = null!;
+
         public static Track[] Tracks = [
             new Track
             {
@@ -60,23 +66,15 @@ namespace MuzikaGromche
         public static Track ChooseTrack()
         {
             var seed = RoundManager.Instance.dungeonGenerator.Generator.ChosenSeed;
-            var sha = SHA256.Create();
+            int[] weights = [.. Tracks.Select(track => track.Weight.Value)];
-            var hash = sha.ComputeHash(BitConverter.GetBytes(seed));
+            var rwi = new RandomWeightedIndex(weights);
-            var trackId = 0;
+            var trackId = rwi.GetRandomWeightedIndex(seed);
-            foreach (var t in hash)
-            {
-                // modulus division on byte array
-                trackId *= 256 % Tracks.Length;
-                trackId %= Tracks.Length;
-                trackId += t % Tracks.Length;
-                trackId %= Tracks.Length;
-            }
 #if DEBUG
             // Override for testing
-            trackId = IndexOfTrack("DeployDestroy");
+            // trackId = IndexOfTrack("DeployDestroy");
 #endif
             var track = Tracks[trackId];
-            Debug.Log($"Seed is {seed}, chosen track is \"{track.Name}\", {trackId} out of {Tracks.Length} tracks");
+            Debug.Log($"Seed is {seed}, chosen track is \"{track.Name}\", #{trackId} of {rwi}");
             return Tracks[trackId];
         }
 
@@ -158,6 +156,7 @@ namespace MuzikaGromche
                     track.LoadedStart = DownloadHandlerAudioClip.GetContent(requests[i * 2]);
                     track.LoadedLoop = DownloadHandlerAudioClip.GetContent(requests[i * 2 + 1]);
                 }
+                Config = new Config(base.Config);
                 new Harmony(PluginInfo.PLUGIN_NAME).PatchAll(typeof(JesterPatch));
             }
             else
@@ -186,6 +185,9 @@ namespace MuzikaGromche
         public AudioClip LoadedStart;
         public AudioClip LoadedLoop;
 
+        // How often this track should be chosen, relative to the sum of weights of all tracks.
+        public SyncedEntry<int> Weight;
+
         public string FileNameStart => $"{Name}Start.{Ext}";
         public string FileNameLoop => $"{Name}Loop.{Ext}";
         private string Ext => AudioType switch
@@ -197,6 +199,142 @@ namespace MuzikaGromche
         };
     }
 
+    public readonly struct RandomWeightedIndex
+    {
+        public RandomWeightedIndex(int[] weights)
+        {
+            Weights = weights;
+            TotalWeights = Weights.Sum();
+            if (TotalWeights == 0)
+            {
+                // If everything is set to zero, everything is equally possible
+                Weights = [.. Weights.Select(_ => 1)];
+                TotalWeights = Weights.Length;
+            }
+        }
+
+        private byte[] GetHash(int seed)
+        {
+            var buffer = new byte[4 * (1 + Weights.Length)];
+            var offset = 0;
+            System.Buffer.BlockCopy(BitConverter.GetBytes(seed), 0, buffer, offset, sizeof(int));
+            // Make sure that tweaking weights even a little drastically changes the outcome
+            foreach (var weight in Weights)
+            {
+                offset += 4;
+                System.Buffer.BlockCopy(BitConverter.GetBytes(weight), 0, buffer, offset, sizeof(int));
+            }
+            var sha = SHA256.Create();
+            var hash = sha.ComputeHash(buffer);
+            return hash;
+        }
+
+        private int GetRawIndex(byte[] hash)
+        {
+            if (TotalWeights == 0)
+            {
+                // Should not happen, but what if Weights array is empty?
+                return -1;
+            }
+
+            var index = 0;
+            foreach (var t in hash)
+            {
+                // modulus division on byte array
+                index *= 256 % TotalWeights;
+                index %= TotalWeights;
+                index += t % TotalWeights;
+                index %= TotalWeights;
+            }
+            return index;
+        }
+
+        private int GetRawIndex(int rawIndex)
+        {
+            if (rawIndex < 0 || rawIndex >= TotalWeights)
+            {
+                return -1;
+            }
+
+            int sum = 0;
+            foreach (var (weight, index) in Weights.Select((x, i) => (x, i)))
+            {
+                sum += weight;
+                if (rawIndex < sum)
+                {
+                    // Found
+                    return index;
+                }
+            }
+
+            return -1;
+        }
+
+        public int GetRandomWeightedIndex(int seed)
+        {
+            var hash = GetHash(seed);
+            var index = GetRawIndex(hash);
+            return GetRawIndex(index);
+        }
+
+        public override string ToString()
+        {
+            return $"Weighted(Total={TotalWeights}, Weights=[{string.Join(',', Weights)}])";
+        }
+
+        readonly private int[] Weights;
+        readonly public int TotalWeights { get; }
+    }
+
+    public class Config : SyncedConfig2<Config>
+    {
+        // TODO: Comment out for now
+        // Personal preferrence, explicitly not synced
+        public ConfigEntry<bool> DisplayLyrics { get; private set; }
+
+        public Config(ConfigFile configFile) : base(PluginInfo.PLUGIN_GUID)
+        {
+            // TODO: Comment out for now
+            DisplayLyrics = configFile.Bind("General", "Display Lyrics", false, "Toggle lyrics display");
+
+            var chanceRange = new AcceptableValueRange<int>(0, 100);
+
+            foreach (var track in Plugin.Tracks)
+            {
+                string description = $"Random (relative) chance of selecting track {track.Name}. Set to zero to effectively disable the track.";
+                track.Weight = configFile.BindSyncedEntry(
+                    new ConfigDefinition("Tracks", track.Name),
+                    50,
+                    new ConfigDescription(description, chanceRange, track));
+            }
+
+            foreach (var track in Plugin.Tracks)
+            {
+                // This is basically what ConfigFile.PopulateEntryContainer does
+                SyncedEntryBase entryBase = track.Weight;
+                EntryContainer.Add(entryBase.BoxedEntry.ToSyncedEntryIdentifier(), entryBase);
+            }
+
+            // TODO: Remove debug lines
+            this.InitialSyncCompleted += (sender, e) =>
+            {
+                var weights = string.Join(',', Plugin.Tracks.Select(track => track.Weight.Value));
+                Debug.Log($"MuzikaGromche Sync complete! weights={weights}");
+            };
+
+            foreach (var track in Plugin.Tracks)
+            {
+                track.Weight.Changed += (sender, e) =>
+                {
+                    var track = (Track)e.ChangedEntry.Entry.Description.Tags[0];
+                    Debug.Log($"MuzikaGromche Sync changed {track.Name}: {e.OldValue} -> {e.NewValue}");
+                };
+            }
+
+            ConfigManager.Register(this);
+        }
+    }
+
     [HarmonyPatch(typeof(JesterAI))]
     internal class JesterPatch
     {

manifest.json

@@ -5,6 +5,7 @@
     "description": "Glaza zakryvaj",
     "website_url": "https://git.vilunov.me/nikita/muzika-gromche",
     "dependencies": [
-        "BepInEx-BepInExPack-5.4.2100"
+        "BepInEx-BepInExPack-5.4.2100",
+        "Sigurd-CSync-5.0.1"
     ]
 }