# Project System

`oxide_engine::project` defines what a game is, on disk: a **project**. A project
is a root directory containing a project file plus a defined folder layout. The
format lives in the engine (not the editor) because the exported runtime and the
Stage-16 packer read it too — the editor just adds the create/open/save UI.

## Layout

```
my-game/
├── project.oxide      # the project file (RON)
├── scenes/            # scene files
├── assets/            # meshes, textures, audio, …
└── scripts/           # game scripts
```

The project file records the project name, the engine version it was saved with,
the enabled [modules](modules.md), and per-project settings.

## Create, open, save

```rust
use oxide_engine::project::Project;

// Scaffold a new project (creates the folders + project file).
let mut project = Project::create("/path/to/my-game", "My Game")?;

project.enable_module("render");
project.save()?;

// Reopen later — by directory or by the project file path.
let project = Project::open("/path/to/my-game")?;
assert_eq!(project.name(), "My Game");
assert!(project.is_module_enabled("render"));
# Ok::<(), oxide_engine::project::ProjectError>(())
```

Path helpers (`scenes_dir()`, `assets_dir()`, `scripts_dir()`,
`project_file_path()`) resolve locations against the root. `create` refuses to
overwrite an existing project; `open` reports `NotFound` when there is no project
file.

## Settings storage

Per-project settings are stored as **opaque per-section RON blobs** keyed by
section name, which keeps the project format independent of any particular
settings schema:

```rust
# use oxide_engine::project::Project;
# let mut project = Project::create(std::env::temp_dir().join("oxide_doc_proj"), "x").unwrap();
project.set_settings_section("editor", "(theme:\"dark\")");
assert_eq!(project.settings_section("editor"), Some("(theme:\"dark\")"));
```

The typed settings framework serializes its sections to and from these strings,
so a section round-trips through the project file without this module knowing the
section's shape.

## Recent projects

`RecentProjects` is a small most-recently-used list, persisted globally as an
editor preference (not inside any project). It de-duplicates and caps:

```rust
use oxide_engine::project::RecentProjects;

let mut recent = RecentProjects::new(10);
recent.record("/path/to/my-game");
// recent.save("~/.config/oxide/recent.ron")?; / RecentProjects::load(...)
assert_eq!(recent.entries().len(), 1);
```

## Who consumes this

| Consumer | Stage | Use |
|----------|-------|-----|
| Editor | 6 | New/Open/Save Project UI, recent list, Project panel/asset browser |
| File watcher | 6 | watches `scenes/`, `assets/`, `scripts/` for live reload |
| Settings framework | 6 | persists per-project sections into the project file |
| Exported runtime / packer | 16 | reads the layout + enabled modules to bundle the game |

[`Project`]: ../engine/src/project.rs
[`RecentProjects`]: ../engine/src/project.rs
