from getpass import getpass
from helpers import SignatureHelper as Signature
from helpers import UtilityHelper

class User:
    def __init__(self, db, private_ser=None, public_ser=None, username=None, password=None):
        self.db = db
        self.private_ser = private_ser
        self.public_ser = public_ser
        self.username = username
        self.password = password

    def login(self):
        input_username = input("Username: ")
        input_password = getpass("Password: ")

        hashed_password = UtilityHelper.computeHash(input_password)

        user = self.db.loginUser(input_username, hashed_password)

        # check if user exists
        if user:
            self.private_ser = user[0]
            self.public_ser = user[1]
            self.username = user[2]
            return True   
        return False

    def register(self):
        input_username = input("Username: ")
        input_password = getpass("Password: ")

        if len(input_username) < 4 or len(input_password) < 4:
            print(f"{UtilityHelper.errorMessage('Username or password is too short, inputs should be atleast 4 characters long')}")
            return False

        hashed_password = UtilityHelper.computeHash(input_password)

        # check if username is already taken
        if self.db.fetchUserByUsername(input_username):
            print(f"{UtilityHelper.errorMessage('Username already taken')}")
            return False

        # create sig for user
        private_key, public_key = Signature.generateKeys()
        private_ser, public_ser = Signature.keysToBytes(private_key, public_key)
        # register user
        if self.db.createUser( private_ser, public_ser, input_username, hashed_password):
            self.private_ser = private_ser
            self.public_ser = public_ser
            self.username = input_username
            return True
        return False
    
    def logout(self):
        self.private_ser = None
        self.public_ser = None
        self.username = None
        return True
    
    def updatePassword(self):
        # Get new password
        new_password = getpass("Enter your new password: ")
        check_new_password = getpass("Enter your new password again: ")


        while new_password != check_new_password and len(new_password) < 4:
            if len(new_password) < 4:
                print(f"{UtilityHelper.warningMessage('Password should be atleast 4 characters long')}")
            if new_password != check_new_password:
                print(f"{UtilityHelper.warningMessage('Passwords do not match')}")
            new_password = getpass("Enter your new password: ")
            check_new_password = getpass("Enter your new password again: ")

        old_password = getpass("Enter your old password: ")
        hashed_new_password = UtilityHelper.computeHash(new_password)
        hashed_old_password = UtilityHelper.computeHash(old_password)

        if self.db.changePassword(self.private_ser, hashed_old_password, hashed_new_password) == True:
            print(f"{UtilityHelper.successMessage('Password updated')}")
        else:
            print(f"{UtilityHelper.errorMessage('Something went wrong while trying to update password..')}")

    def updateAccount(self):
        # Get new username
        new_username = input("Enter your new username: ")

        if len(new_username) < 4:
            print(f"{UtilityHelper.errorMessage('Username should be atleast 4 characters long')}")
            return False
        # check if username is already taken
        if self.db.fetchUserByUsername(new_username):
            print(f"{UtilityHelper.errorMessage('Username already taken')}")
            return False

        if self.db.changeUsername(self.private_ser, new_username) == True:
            self.username = new_username
            print(f"{UtilityHelper.successMessage('Username updated')}")
        else:
            print(f"{UtilityHelper.errorMessage('Something went wrong while trying to update username..')}")


    def deleteAccount(self):

        while True:
            print(f"Are you sure you want to delete this account?\n{UtilityHelper.warningMessage('(this will burn all coins available in this account)')} (y/n)")
            confirm = input(">>: ")
            if confirm == "y" or confirm == "Y":
                print(f"{UtilityHelper.warningMessage('Deleting account..')}")
                break

            elif confirm == "n" or confirm == "N":
                return False
            
            else:
                print(f"{UtilityHelper.warningMessage('Invalid input')}")

        if self.db.deleteUser(self.private_ser) == True:
            print(f"{UtilityHelper.successMessage('Account deleted')}")
            self.logout()
            return True
        else:
            print(f"{UtilityHelper.errorMessage('Something went wrong while trying to delete account..')}")
            return False

    def printAccountInfo(self):
        print("Username: " + self.username)
        print(self.public_ser)
        print(self.private_ser)