app.py

import os
from flask import Flask, jsonify, request, render_template
import config  # <--- Imported configuration module
from extensions import mongo, mail 
# We need to import urllib for proper URL escaping in case the MONGO_URI needs to be manually cleaned.
from urllib.parse import quote_plus
# --- END IMPORTS ---


# --- START DATABASE CONNECTION FIX ---
# Reads the MONGO_URI from the environment/secrets (set via Hugging Face Secrets).
MONGO_URI_SECRET = os.environ.get('MONGO_URI') 

# Define the database name to be used (ensure this name exists in your Atlas cluster)
DB_NAME = "assessment_db" # FIXED: Using the confirmed database name from Atlas

if MONGO_URI_SECRET:
    # Use the MONGO_URI from the environment (Hugging Face Secret) for deployment
    class Config:
        MONGO_URI = MONGO_URI_SECRET
        # CRITICAL FIX: Explicitly set the database name for the connection object
        MONGO_DBNAME = DB_NAME 
    app = Flask(__name__)
    app.config.from_object(Config)
else:
    # Fallback to local configuration for development (as defined in your original app.py)
    app = Flask(__name__)
    app.config.from_object(config)
    print("WARNING: MONGO_URI secret not found. Using local config/localhost.")

# --- END DATABASE CONNECTION FIX ---

# Initialize extensions
# We move the mongo initialization here to ensure it uses the final app config
mongo.init_app(app)
mail.init_app(app)

# Import blueprints after extensions (assuming they are in separate files)
from routes.auth import auth_bp
from routes.test_routes import test_bp

app.register_blueprint(auth_bp)
app.register_blueprint(test_bp)

from services.feedback_agent import build_feedback_agent
app.feedback_agent = build_feedback_agent()

# Import the evaluation logic (models load here, all NLTK/HF caching fixed)
from services.evaluation import evaluate_answer # Imported, models loaded here

@app.route("/")
def home():
    # This line uses the explicit client connection (mongo.cx) and database name (DB_NAME)
    # to avoid the 'AttributeError: NoneType' object has no attribute 'tests' crash.
    global DB_NAME 
    # Use mongo.cx[DB_NAME] for reliable database access in Flask-PyMongo setups.
    tests = list(mongo.cx[DB_NAME].tests.find({}, {"_id": 0})) 
    return render_template("home.html", tests=tests)

if __name__ == "__main__":
    app.run(debug=True)