# Godot C# Library Management with Git Submodules

## Overview

Manage reusable C# libraries across multiple Godot projects using Git submodules. Each library is a separate repository that game projects include as submodules.

## Directory Structure

```
~/GameDev/
├── Godot/                     # Engine installation
├── libraries/                 # Local library development
│   ├── utilities/
│   ├── audio-manager/
│   └── ui-framework/
└── projects/                  # Game projects
    ├── test-game/
    │   └── Libraries/         # Git submodules
    │       ├── utilities/
    │       └── audio-manager/
    └── puzzle-game/
        └── Libraries/
            └── utilities/
```

**Git Organization:**
- `library/` org - Reusable libraries
- `project/` org - Game projects

## Prerequisites

- Godot v4.5.1+ (C# support)
- .NET 8.0+
- Git with Gitea access
- Gitea organizations: `library` and `project`

## Create a Library

### 1. Initialize Repository

```bash
cd ~/GameDev/libraries
git init utilities
cd utilities
mkdir -p Scripts
```

### 2. Configure Library

**project.godot:**
```ini
[application]
config/name="Utilities Library"
config/features=PackedStringArray("4.3", "C#", "Forward Plus")

[dotnet]
project/assembly_name="EinSoftworks.Utilities"
```

**Utilities.csproj:**
```xml
<Project Sdk="Godot.NET.Sdk/4.3.0">
  <PropertyGroup>
    <TargetFramework>net6.0</TargetFramework>
    <EnableDynamicLoading>true</EnableDynamicLoading>
    <RootNamespace>EinSoftworks.Utilities</RootNamespace>
    <AssemblyName>EinSoftworks.Utilities</AssemblyName>
  </PropertyGroup>
</Project>
```

### 3. Add Code

**Scripts/MathUtils.cs:**
```csharp
using Godot;

namespace EinSoftworks.Utilities
{
    public static class MathUtils
    {
        public static float Clamp01(float value) => Mathf.Clamp(value, 0f, 1f);
        
        public static bool Approximately(float a, float b, float threshold = 0.001f) 
            => Mathf.Abs(a - b) < threshold;
        
        public static float DegreesToRadians(float degrees) => degrees * Mathf.Pi / 180f;
        
        public static float RadiansToDegrees(float radians) => radians * 180f / Mathf.Pi;
    }
}
```

### 4. Create .gitignore

```gitignore
.godot/
.import/
.mono/
bin/
obj/
*.tmp
export_presets.cfg
```

### 5. Commit and Push

```bash
git add .
git commit -m "Initial utilities library"
git remote add origin https://git.ein-softworks.com/library/utilities.git
git branch -M main
git push -u origin main
```

## Create a Game Project

### 1. Initialize Project

```bash
cd ~/GameDev/projects
git init test-game
cd test-game
mkdir -p Scripts Scenes Libraries
```

### 2. Configure Project

**project.godot:**
```ini
[application]
config/name="Test Game"
config/features=PackedStringArray("4.3", "C#", "Forward Plus")
run/main_scene="res://Scenes/Main.tscn"

[dotnet]
project/assembly_name="TestGame"
```

**TestGame.csproj:**
```xml
<Project Sdk="Godot.NET.Sdk/4.3.0">
  <PropertyGroup>
    <TargetFramework>net6.0</TargetFramework>
    <EnableDynamicLoading>true</EnableDynamicLoading>
    <RootNamespace>TestGame</RootNamespace>
  </PropertyGroup>
  
  <ItemGroup>
    <ProjectReference Include="Libraries/utilities/Utilities.csproj" />
  </ItemGroup>
</Project>
```

### 3. Add Library as Submodule

```bash
git submodule add https://git.ein-softworks.com/library/utilities.git Libraries/utilities
git submodule update --init --recursive
```

### 4. Use Library in Code

**Scripts/Main.cs:**
```csharp
using Godot;
using EinSoftworks.Utilities;

namespace TestGame
{
    public partial class Main : Node2D
    {
        public override void _Ready()
        {
            float radians = MathUtils.DegreesToRadians(90f);
            GD.Print($"90° = {radians} rad");
        }
    }
}
```

### 5. Create Scene and Commit

Create `Scenes/Main.tscn` in Godot, then:

```bash
cp ../utilities/.gitignore .
git add .
git commit -m "Initial test game with utilities library"
git remote add origin https://git.ein-softworks.com/project/test-game.git
git branch -M main
git push -u origin main
```

## Common Operations

### Update Library to Latest

```bash
cd ~/GameDev/projects/test-game
git submodule update --remote Libraries/utilities
git add .
git commit -m "Update utilities library"
git push
```

In Godot: **Project → Reload Current Project**, then rebuild.

### Update to Specific Version

```bash
cd ~/GameDev/projects/test-game/Libraries/utilities
git checkout v1.2.0
cd ../..
git add Libraries/utilities
git commit -m "Update utilities to v1.2.0"
git push
```

### Add Another Library

```bash
cd ~/GameDev/projects/test-game
git submodule add https://git.ein-softworks.com/library/audio-manager.git Libraries/audio-manager
```

Update **TestGame.csproj**:
```xml
<ItemGroup>
  <ProjectReference Include="Libraries/utilities/Utilities.csproj" />
  <ProjectReference Include="Libraries/audio-manager/AudioManager.csproj" />
</ItemGroup>
```

```bash
git add .
git commit -m "Add audio-manager library"
git push
```

### Create New Project with Existing Libraries

```bash
cd ~/GameDev/projects
git init puzzle-game
cd puzzle-game
mkdir -p Scripts Scenes Libraries

# Add libraries
git submodule add https://git.ein-softworks.com/library/utilities.git Libraries/utilities
git submodule add https://git.ein-softworks.com/library/audio-manager.git Libraries/audio-manager
git submodule update --init --recursive

# Create project.godot and .csproj with references
# (see example structure above)

git add .
git commit -m "Initial puzzle game setup"
git remote add origin https://git.ein-softworks.com/project/puzzle-game.git
git push -u origin main
```

### Clone Project on New Machine

```bash
git clone --recursive https://git.ein-softworks.com/project/test-game.git

# Or if already cloned
cd test-game
git submodule update --init --recursive
```

## Library Dependencies

If one library depends on another, reference it in the .csproj:

**Libraries/ui-framework/UIFramework.csproj:**
```xml
<ItemGroup>
  <ProjectReference Include="../utilities/Utilities.csproj" />
</ItemGroup>
```

## Version Control

### Create Library Release

```bash
cd ~/GameDev/libraries/utilities
git tag -a v1.0.0 -m "Release v1.0.0 - Initial stable release"
git push origin v1.0.0
```

### Development Workflow

```bash
# Library development
cd ~/GameDev/libraries/utilities
git checkout -b feature/new-utils
# Make changes
git add .
git commit -m "Add new utility functions"
git push origin feature/new-utils
# Merge in Gitea, then pull main
git checkout main
git pull origin main

# Update in project
cd ~/GameDev/projects/test-game
git submodule update --remote Libraries/utilities
git add .
git commit -m "Update utilities to latest"
git push
```

## Best Practices

**Library Design:**
- Keep libraries focused and single-purpose
- Use namespace pattern: `CompanyName.LibraryName`
- Document public APIs with XML comments
- Use semantic versioning (major.minor.patch)

**Project Organization:**
- Use kebab-case for repos, PascalCase for namespaces
- Only include needed libraries
- Test after library updates

**Git Workflow:**
- Use feature branches for development
- Write clear commit messages
- Push changes regularly
- Tag important releases

## Troubleshooting

**Submodule empty:**
```bash
git submodule update --init --recursive
```

**Build errors:**
- Godot → **Project → Reload Current Project**
- **Project → Tools → C# → Create C# solution**
- Rebuild

**Missing references:**
Check `.csproj` has all `<ProjectReference>` entries.

**Submodule update conflicts:**
```bash
cd Libraries/utilities
git stash
git pull origin main
git stash pop
```

**IntelliSense not working:**
- Reload Godot project
- Rebuild solution
- Restart VS Code with project folder open