app/main.py

from fastapi import FastAPI
from starlette.middleware.sessions import SessionMiddleware
from starlette.requests import Request
from starlette.responses import HTMLResponse
from starlette.templating import Jinja2Templates

from app.core.config import settings
from app.api.v1.api import api_router

app = FastAPI(title=settings.PROJECT_NAME)

# 1. Add Session Middleware
# This is required for Authlib to store the temporary state during the OAuth dance
app.add_middleware(
    SessionMiddleware, 
    secret_key=settings.SECRET_KEY, 
    https_only=False # Set to True in production with SSL
)

# 2. Include API Routers
app.include_router(api_router)

# 3. Simple Frontend for demonstration
templates = Jinja2Templates(directory="app/templates")

@app.get("/", response_class=HTMLResponse)
async def root(request: Request):
    user = request.session.get("user")
    return templates.TemplateResponse("index.html", {"request": request, "user": user})

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