Add test suite and polish project documentation

- 8 pytest tests covering health, upload validation, API responses, schemas
- Updated README with architecture diagram, feature list, design decisions
- Live demo link and complete API reference

README.md

@@ -4,12 +4,51 @@ Interactive IFC-based 3D building model viewer. Upload an IFC file to
 inspect building elements, their properties, and navigate the model in
 a browser-based 3D view.
 
+**Live demo:** [bim.stifting.at](https://bim.stifting.at)
+
+## Features
+
+- Upload IFC files (IFC2x3, IFC4) via drag-and-drop or file picker
+- Server-side conversion to glTF binary for efficient 3D rendering
+- Interactive Three.js viewer with orbit, pan, and zoom controls
+- Click any building element to inspect its IFC properties
+- Filter elements by type (wall, door, window, slab, ...) and storey
+- Double-click to set a new orbit pivot point
+- Collapsible floating panels for unobstructed 3D viewing
+- Full REST API with automatic OpenAPI documentation
+
 ## Tech stack
 
-- **Backend:** Python 3.12, FastAPI, SQLAlchemy (async), IfcOpenShell
-- **Frontend:** Vue.js 3, Three.js
-- **Database:** PostgreSQL 16
-- **Infrastructure:** Docker Compose, Caddy, Forgejo CI
+| Layer          | Technology                                      |
+|----------------|------------------------------------------------|
+| Backend        | Python 3.12, FastAPI, SQLAlchemy (async)        |
+| IFC processing | IfcOpenShell (parsing + geometry serialization) |
+| Frontend       | Vue.js 3, Three.js, Vite                        |
+| Database       | PostgreSQL 16                                   |
+| Infrastructure | Docker Compose, Caddy, Forgejo CI, Linux        |
+
+## Architecture
+
+```
+Browser                          Server
+┌─────────────┐    HTTPS    ┌──────────────────────────┐
+│  Vue.js     │◄───────────►│  Caddy (reverse proxy)   │
+│  Three.js   │             └──────┬───────────────────┘
+│  GLTFLoader │                    │
+└─────────────┘             ┌──────▼───────────────────┐
+                            │  FastAPI                  │
+                            │  ├─ /api/upload           │
+                            │  ├─ /api/projects         │
+                            │  ├─ /api/elements         │
+                            │  └─ /api/projects/*/model │
+                            └──────┬───────────────────┘
+                                   │
+                    ┌──────────────┼──────────────┐
+                    ▼              ▼              ▼
+              PostgreSQL    IfcOpenShell     glb files
+              (elements,    (IFC parser +   (3D models)
+               properties)  geometry engine)
+```
 
 ## Quick start
 
@@ -20,9 +59,27 @@ cp .env.example .env
 docker compose up -d
 ```
 
-- **API:** http://localhost:8000
-- **API docs:** http://localhost:8000/docs
 - **Frontend:** http://localhost:5173
+- **API docs:** http://localhost:8000/docs
+- **Health check:** http://localhost:8000/health
+
+## API overview
+
+| Method | Endpoint                                          | Description                |
+|--------|---------------------------------------------------|----------------------------|
+| GET    | `/health`                                         | Health check               |
+| POST   | `/api/upload`                                     | Upload and parse IFC file  |
+| GET    | `/api/projects`                                   | List all projects          |
+| GET    | `/api/projects/{id}/elements`                     | List elements (filterable) |
+| GET    | `/api/projects/{id}/elements/by-global-id/{gid}`  | Lookup element by GlobalId |
+| GET    | `/api/elements/{id}`                              | Element detail + properties|
+| GET    | `/api/projects/{id}/model.glb`                    | Download 3D model          |
+
+## Running tests
+
+```bash
+docker compose exec backend python -m pytest -v
+```
 
 ## Project structure
 
@@ -33,44 +90,34 @@ docker compose up -d
 │   │   ├── api/            # FastAPI route handlers
 │   │   ├── models/         # SQLAlchemy ORM models
 │   │   ├── schemas/        # Pydantic request/response schemas
-│   │   └── services/       # Business logic (IFC parsing)
-│   ├── tests/
+│   │   └── services/       # IFC parsing and geometry conversion
+│   ├── tests/              # pytest test suite
 │   ├── Dockerfile
 │   └── requirements.txt
 ├── frontend/
 │   ├── src/
-│   │   ├── components/     # Vue components (viewer, panels)
-│   │   ├── views/          # Page-level views
-│   │   └── composables/    # Reusable composition functions
+│   │   ├── components/     # Vue components
+│   │   ├── composables/    # useApi, useViewer (Three.js)
+│   │   └── App.vue         # Main application
 │   ├── Dockerfile
 │   └── package.json
-├── data/
-│   └── sample/             # Example IFC files for testing
-├── docs/
+├── data/sample/            # Example IFC files
 ├── docker-compose.yml
 └── README.md
 ```
 
-## API overview
+## Design decisions
 
-| Method | Endpoint                              | Description               |
-|--------|---------------------------------------|---------------------------|
-| GET    | `/health`                             | Health check              |
-| POST   | `/api/upload`                         | Upload and parse IFC file |
-| GET    | `/api/projects`                       | List all projects         |
-| GET    | `/api/projects/{id}/elements`         | List elements (filterable)|
-| GET    | `/api/elements/{id}`                  | Element detail + properties|
+- **Server-side IFC→glb conversion** rather than client-side WASM processing.
+  IfcOpenShell's geometry engine produces optimized meshes with IFC GlobalIds
+  preserved as mesh names, enabling click-to-inspect without shipping heavy
+  WASM bundles to the browser.
 
-## Running tests
+- **Async SQLAlchemy** for non-blocking database access during concurrent
+  file uploads and API queries.
 
-```bash
-# Backend
-docker compose exec backend pytest -v
-
-# Or locally
-cd backend
-python -m pytest -v
-```
+- **Floating UI panels** over a full-viewport 3D canvas for maximum spatial
+  awareness while inspecting element metadata.
 
 ## License
 

backend/tests/test_elements.py

@@ -0,0 +1,18 @@
+"""Test the elements API endpoints."""
+
+import pytest
+from httpx import ASGITransport, AsyncClient
+
+from app.main import app
+
+
+@pytest.mark.asyncio
+async def test_list_projects_returns_list():
+    """Projects endpoint returns a list."""
+    transport = ASGITransport(app=app)
+    async with AsyncClient(transport=transport, base_url="http://test") as client:
+        response = await client.get("/api/projects")
+
+    assert response.status_code == 200
+    assert isinstance(response.json(), list)
+

backend/tests/test_health.py

@@ -8,10 +8,10 @@ from app.main import app
 
 @pytest.mark.asyncio
 async def test_health_returns_ok():
+    """Health endpoint returns status ok."""
     transport = ASGITransport(app=app)
     async with AsyncClient(transport=transport, base_url="http://test") as client:
         response = await client.get("/health")
 
     assert response.status_code == 200
     assert response.json() == {"status": "ok"}
-

backend/tests/test_models.py

@@ -0,0 +1,46 @@
+"""Test database models and schema validation."""
+
+from app.schemas.element import ProjectOut, ElementOut, PropertyOut
+from uuid import uuid4
+
+
+def test_project_schema_validates():
+    """ProjectOut schema accepts valid data."""
+    data = {
+        "id": uuid4(),
+        "name": "Test Project",
+        "filename": "test.ifc",
+        "description": "A test",
+        "ifc_schema": "IFC4",
+        "element_count": 42,
+    }
+    project = ProjectOut(**data)
+    assert project.name == "Test Project"
+    assert project.element_count == 42
+
+
+def test_element_schema_validates():
+    """ElementOut schema accepts valid data."""
+    data = {
+        "id": uuid4(),
+        "global_id": "2XPyKWY018sA1ygZKgQPtU",
+        "ifc_type": "IfcWall",
+        "name": "Wall-1",
+        "description": "",
+        "storey": "Ground Floor",
+    }
+    element = ElementOut(**data)
+    assert element.ifc_type == "IfcWall"
+
+
+def test_property_schema_validates():
+    """PropertyOut schema accepts valid data."""
+    data = {
+        "id": uuid4(),
+        "pset_name": "Pset_WallCommon",
+        "name": "ThermalTransmittance",
+        "value": "1.5",
+    }
+    prop = PropertyOut(**data)
+    assert prop.pset_name == "Pset_WallCommon"
+

backend/tests/test_upload.py

@@ -0,0 +1,34 @@
+"""Test the IFC upload endpoint."""
+
+import pytest
+from httpx import ASGITransport, AsyncClient
+
+from app.main import app
+
+
+@pytest.mark.asyncio
+async def test_upload_rejects_non_ifc():
+    """Upload endpoint rejects files without .ifc extension."""
+    transport = ASGITransport(app=app)
+    async with AsyncClient(transport=transport, base_url="http://test") as client:
+        response = await client.post(
+            "/api/upload",
+            files={"file": ("model.obj", b"dummy content", "application/octet-stream")},
+        )
+
+    assert response.status_code == 400
+    assert "Only .ifc files" in response.json()["detail"]
+
+
+@pytest.mark.asyncio
+async def test_upload_rejects_empty_filename():
+    """Upload endpoint rejects files with wrong extension."""
+    transport = ASGITransport(app=app)
+    async with AsyncClient(transport=transport, base_url="http://test") as client:
+        response = await client.post(
+            "/api/upload",
+            files={"file": ("readme.txt", b"not an ifc file", "text/plain")},
+        )
+
+    assert response.status_code == 400
+