import typing
import argon2
import psycopg2

import dbHandler
import userHandler

debug: bool = True

passwordHasher = argon2.PasswordHasher()

def debugPrint(msg: str) -> None:
    if debug:
        print("(SECURITY HANDLER) PRINT:  " + msg)

def hashPassword(password: str) -> str:
    return passwordHasher.hash(password)
    
def verifyPassword(password: str, hash: str) -> bool:
    try:
        if passwordHasher.verify(hash, password):
            return True
        else:
            return False
    except:
        return False

def verifyRehash(hash: str) -> bool:
    try:
        if passwordHasher.check_needs_rehash(hash):
            return True
        else:
            return False
    except:
        return False

def handlePasswordVerification(dbConnection: psycopg2.extensions.connection, password: str, userID: int) -> bool:
    try:
        hash = userHandler.getHashValueByUserID(dbConnection, userID)
        userIDstr = str(userID)
        debugPrint("Now verifying password against hash for user ID " + userIDstr + "...")
        if verifyPassword(password, hash):
            debugPrint("(USER ID " + userIDstr + ") Password verification success!")
            if verifyRehash(hash):
                debugPrint("(USER ID " + userIDstr + ") Hash needs to be rehashed! Will now rehash...")
            return True
        else:
            debugPrint("(USER ID " + userIDstr + ") Password verification failure! Invalid password.")
            return False
    except Exception as error:
        debugPrint("(USER ID " + userIDstr + ") Password verification failure! Unexpected error: " + repr(error) + ".")
        return False