LabelingSystem/backend/main.py

"""
FastAPI application entry point.
Provides RESTful API for the annotation platform.
"""
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from contextlib import asynccontextmanager
from database import init_database


@asynccontextmanager
async def lifespan(app: FastAPI):
    """
    Application lifespan manager.
    Initializes database on startup.
    """
    # Startup: Initialize database
    init_database()
    yield
    # Shutdown: cleanup if needed


# Create FastAPI application instance
app = FastAPI(
    title="Annotation Platform API",
    description="RESTful API for data annotation management",
    version="1.0.0",
    lifespan=lifespan
)

# Configure CORS middleware
app.add_middleware(
    CORSMiddleware,
    allow_origins=[
        "http://localhost:4200",  # Frontend dev server
        "http://localhost:3000",  # Alternative frontend port
    ],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)


@app.get("/")
async def root():
    """Root endpoint - health check"""
    return {
        "message": "Annotation Platform API",
        "status": "running",
        "version": "1.0.0"
    }


@app.get("/health")
async def health_check():
    """Health check endpoint"""
    return {"status": "healthy"}


if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=8000)