initialize repo

Lib/Civilization.Shared/.gitignore

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+## Ignore Visual Studio temporary files, build results, and
+## files generated by popular Visual Studio add-ons.
+
+# User-specific files
+*.suo
+*.user
+*.sln.docstates
+
+# Build results
+
+[Dd]ebug/
+[Rr]elease/
+x64/
+[Bb]in/
+[Oo]bj/
+
+# MSTest test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+
+*_i.c
+*_p.c
+*_i.h
+*.ilk
+*.meta
+*.obj
+*.pch
+*.pdb
+*.pgc
+*.pgd
+*.rsp
+*.sbr
+*.tlb
+*.tli
+*.tlh
+*.tmp
+*.tmp_proj
+*.log
+*.vspscc
+*.vssscc
+.builds
+*.pidb
+*.log
+*.svclog
+*.scc
+
+# Visual C++ cache files
+ipch/
+*.aps
+*.ncb
+*.opensdf
+*.sdf
+*.cachefile
+
+# Visual Studio profiler
+*.psess
+*.vsp
+*.vspx
+
+# Guidance Automation Toolkit
+*.gpState
+
+# ReSharper is a .NET coding add-in
+_ReSharper*/
+*.[Rr]e[Ss]harper
+*.DotSettings.user
+
+# Click-Once directory
+publish/
+
+# Publish Web Output
+*.Publish.xml
+*.pubxml
+*.azurePubxml
+
+# NuGet Packages Directory
+## TODO: If you have NuGet Package Restore enabled, uncomment the next line
+packages/
+## TODO: If the tool you use requires repositories.config, also uncomment the next line
+!packages/repositories.config
+
+# Windows Azure Build Output
+csx/
+*.build.csdef
+
+# Windows Store app package directory
+AppPackages/
+
+# Others
+sql/
+*.Cache
+ClientBin/
+[Ss]tyle[Cc]op.*
+![Ss]tyle[Cc]op.targets
+~$*
+*~
+*.dbmdl
+*.[Pp]ublish.xml
+
+*.publishsettings
+
+# RIA/Silverlight projects
+Generated_Code/
+
+# Backup & report files from converting an old project file to a newer
+# Visual Studio version. Backup files are not needed, because we have git ;-)
+_UpgradeReport_Files/
+Backup*/
+UpgradeLog*.XML
+UpgradeLog*.htm
+
+# SQL Server files
+App_Data/*.mdf
+App_Data/*.ldf
+
+# =========================
+# Windows detritus
+# =========================
+
+# Windows image file caches
+Thumbs.db
+ehthumbs.db
+
+# Folder config file
+Desktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Mac desktop service store files
+.DS_Store
+
+_NCrunch*

Lib/Civilization.Shared/Civilization.Shared.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net8.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\Civilization.Core\Civilization.Core.csproj" />
+    </ItemGroup>
+
+</Project>

Lib/Civilization.Shared/Commands/BaseCommand.cs

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+namespace Civilization.Shared.Commands;
+
+public abstract record BaseCommand;

Lib/Civilization.Shared/Commands/EndTurnCommand.cs

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+namespace Civilization.Shared.Commands;
+
+public record EndTurnCommand() : BaseCommand;

Lib/Civilization.Shared/Commands/MoveUnitCommand.cs

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+using Civilization.Core;
+
+namespace Civilization.Shared.Commands;
+
+public record MoveUnitCommand(Guid UnitId, Vec2I TargetPosition) : BaseCommand;

Lib/Civilization.Shared/Commands/SettleCityCommand.cs

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+namespace Civilization.Shared.Commands;
+
+public record SettleCityCommand(Guid UnitId) : BaseCommand;

Lib/Civilization.Shared/JsonPolymorphicConverter.cs

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+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace Civilization.Shared;
+
+public class JsonPolymorphicConverter<TBase> : JsonConverter<TBase>
+{
+    private readonly Dictionary<string, Type> _typeMap;
+
+    public JsonPolymorphicConverter()
+    {
+        _typeMap = AppDomain.CurrentDomain.GetAssemblies()
+            .SelectMany(a => a.GetTypes())
+            .Where(t => typeof(TBase).IsAssignableFrom(t) && !t.IsAbstract && !t.IsInterface)
+            .ToDictionary(t => t.Name, t => t);
+    }
+    
+    public override TBase? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+    {
+        using var doc = JsonDocument.ParseValue(ref reader);
+        if (!doc.RootElement.TryGetProperty("type", out var typeProp))
+            throw new JsonException("Missing 'type' field for polymorphic deserialization");
+
+        var typeName = typeProp.GetString();
+        if (typeName is null || !_typeMap.TryGetValue(typeName, out var derivedType))
+            throw new JsonException($"Unknown type discriminator: '{typeName}'");
+
+        var json = doc.RootElement.GetRawText();
+        return (TBase?)JsonSerializer.Deserialize(json, derivedType, options);
+    }
+    
+    public override void Write(Utf8JsonWriter writer, TBase value, JsonSerializerOptions options)
+    {
+        using var jsonDoc = JsonDocument.Parse(JsonSerializer.Serialize(value, value.GetType(), options));
+
+        writer.WriteStartObject();
+        writer.WriteString("type", value.GetType().Name);
+
+        foreach (var prop in jsonDoc.RootElement.EnumerateObject())
+        {
+            prop.WriteTo(writer);
+        }
+
+        writer.WriteEndObject();
+    }
+}

Lib/Civilization.Shared/Packets/ClientMessage.cs

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+using Civilization.Shared.Commands;
+
+namespace Civilization.Shared.Packets;
+
+public record ClientMessage(int PlayerId, BaseCommand Command);

Lib/Civilization.Shared/Packets/PlayerInfo.cs

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+namespace Civilization.Shared.Packets;
+
+public record PlayerInfo(int Id, string Name, string ColorHex);

Lib/Civilization.Shared/Packets/ServerMessages/BaseServerMessage.cs

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+namespace Civilization.Shared.Packets.ServerMessages;
+
+public abstract record BaseServerMessage;

Lib/Civilization.Shared/Packets/ServerMessages/ErrorMessage.cs

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+namespace Civilization.Shared.Packets.ServerMessages;
+
+public record ErrorMessage(string Reason) : BaseServerMessage;

Lib/Civilization.Shared/Packets/ServerMessages/LogMessage.cs

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+namespace Civilization.Shared.Packets.ServerMessages;
+
+public record LogMessage(string Message) : BaseServerMessage;

Lib/Civilization.Shared/Packets/ServerMessages/StateUpdateMessage.cs

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+using Civilization.Core.Game;
+
+namespace Civilization.Shared.Packets.ServerMessages;
+
+public record StateUpdateMessage(GameState GameState, PlayerInfo CurrentPlayer) : BaseServerMessage;

Lib/Civilization.Shared/SharedJson.cs

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+using System.Text.Json;
+using System.Text.Json.Serialization;
+using Civilization.Shared.Commands;
+using Civilization.Shared.Packets.ServerMessages;
+
+namespace Civilization.Shared;
+
+public static class SharedJson
+{
+    public static readonly JsonSerializerOptions Options = new()
+    {
+        PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
+        Converters =
+        {
+            new JsonStringEnumConverter(JsonNamingPolicy.CamelCase),
+            new JsonPolymorphicConverter<BaseCommand>(),
+            new JsonPolymorphicConverter<BaseServerMessage>(),
+        },
+        WriteIndented = false
+    };
+}