import bcrypt
from pymongo import MongoClient
import re
import os

uri = f"mongodb+srv://{os.getenv('mongo_secret')}@void-uep.guig8vk.mongodb.net/?retryWrites=true&w=majority"
client = MongoClient(uri)
db = client["ImagiGen"]
users_collection = db["users"]


def hash_password(password: str) -> str:
    # Generate a salt and hash the password
    salt = bcrypt.gensalt()
    hashed_password = bcrypt.hashpw(password.encode(), salt)
    return hashed_password.decode()

def verify_password(entered_password: str, stored_hashed_password: str) -> bool:
    # Check if the entered password matches the stored hashed password
    return bcrypt.checkpw(entered_password.encode(), stored_hashed_password.encode())

def validate_email(email):
    # Define a regex pattern for validating an email
    email_pattern = r'^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$'
    # Use re.match() to check if the email matches the pattern
    if re.match(email_pattern, email):
        return True
    return False

def register(email_id, password):
    if not validate_email(email_id):
        return "Invalid Email Id"
    # Check if username already exists
    if users_collection.find_one({"email": email_id}):
        return "Email ID already Registered"
    # Insert new user into the collection
    password = hash_password(password)
    users_collection.insert_one({"email": email_id, "password": password})
    return "Registration successful"


def login(email_id, password):
    # Check if username and password match
    user = users_collection.find_one({"email": email_id})
    if user :
        hash_password = user["password"]
        verify = verify_password(entered_password= password, stored_hashed_password = hash_password)
        if verify:
            return "Login successful"
        else :
            return "Invalid credentials"
    else:
        return "Invalid credentials"