"""
FastAPI application entry point.
Provides RESTful API for the annotation platform with JWT authentication.
"""
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from contextlib import asynccontextmanager
from database import init_database
from routers import project, task, annotation, auth, oauth
from middleware.auth_middleware import AuthMiddleware


@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 with JWT authentication",
    version="1.0.0",
    lifespan=lifespan
)

# Configure CORS middleware (must be added first)
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=["*"],
)

# Add authentication middleware (after CORS)
app.add_middleware(AuthMiddleware)

# Include routers
app.include_router(auth.router)
app.include_router(oauth.router)
app.include_router(project.router)
app.include_router(task.router)
app.include_router(annotation.router)


@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=8002)