import os
import sys
from pathlib import Path
from contextlib import asynccontextmanager

# Add project root and local src to path to allow direct execution
current_dir = Path(__file__).resolve().parent
project_root = current_dir.parent.parent.parent.parent # d:\...pipeline
sys.path.append(str(project_root))
sys.path.append(str(current_dir.parent)) # d:\...\rag-api

from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from src.core.config import settings
from src.api.routes import rag, analytics, interactions, accounts, news, auth, top_stories
from src.infrastructure.database import init_db
from src.api.dependencies import prewarm_models
import threading
import uvicorn


@asynccontextmanager
async def lifespan(app: FastAPI):
    # Startup
    init_db()
    # Pre-warming moved to lazy loading or manual script to prevent 
    # initialization timeouts/crashes on the first run.
    # thread = threading.Thread(target=prewarm_models)
    # thread.start()
    yield
    # Shutdown (if needed)
    pass


app = FastAPI(
    title=settings.PROJECT_NAME,
    openapi_url=f"{settings.API_V1_STR}/openapi.json",
    lifespan=lifespan
)

# Set all CORS enabled origins
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

app.include_router(rag.router, prefix=f"{settings.API_V1_STR}/rag", tags=["RAG"])
app.include_router(analytics.router, prefix=f"{settings.API_V1_STR}/analytics", tags=["Analytics"])
app.include_router(interactions.router, prefix=f"{settings.API_V1_STR}/interactions", tags=["Interactions"])
app.include_router(accounts.router, prefix=f"{settings.API_V1_STR}/accounts", tags=["Accounts"])
# Alias for registration convenience
app.include_router(accounts.router, prefix=f"{settings.API_V1_STR}/users", tags=["Users"], include_in_schema=False)
app.include_router(auth.router, prefix=f"{settings.API_V1_STR}/auth", tags=["Auth"])
app.include_router(news.router, prefix=f"{settings.API_V1_STR}/news", tags=["News"])
app.include_router(top_stories.router, prefix=f"{settings.API_V1_STR}", tags=["Top Stories"])

@app.get(f"{settings.API_V1_STR}/status")
def get_status():
    return {"status": "online", "message": "RAG API Service is operational"}

@app.get("/")
def read_root():
    return {"message": "Welcome to the RAG API Service", "status": "online"}

if __name__ == "__main__":
    # Start the server directly from this script
    # Use the app object directly for simplicity when running as main
    uvicorn.run(app, host="0.0.0.0", port=8000)