import os
from fastapi import FastAPI
from starlette.middleware.sessions import SessionMiddleware
from starlette.staticfiles import StaticFiles
from starlette.responses import FileResponse

import models
from database import engine
import auth # Import the new auth module
from config import settings # Import settings to get the secret key

# --- Absolute Path Configuration ---
# Get the absolute path of the directory where this file is located
BASE_DIR = os.path.dirname(os.path.abspath(__file__))
STATIC_DIR = os.path.join(BASE_DIR, "static")

# This line tells SQLAlchemy to create all the tables based on the models
# we defined. It will create the `multichat_overlay.db` file with the
# 'users' and 'settings' tables if they don't exist.
models.Base.metadata.create_all(bind=engine)

app = FastAPI()

# Mount the 'static' directory using an absolute path for reliability
app.mount("/static", StaticFiles(directory=STATIC_DIR), name="static")

# Add the authentication router
app.include_router(auth.router)

# Add session middleware. A secret key is required for signing the session cookie.
# We can reuse our encryption key for this, but in production you might want a separate key.
app.add_middleware(SessionMiddleware, secret_key=settings.ENCRYPTION_KEY)

@app.get("/")
async def read_root():
    return FileResponse(os.path.join(STATIC_DIR, "login.html"))