import random
import string


class Factory:
    model = None

    def definition(self) -> dict:
        raise NotImplementedError

    def make(self, **overrides) -> dict:
        data = self.definition()
        data.update(overrides)
        return {k: v for k, v in data.items() if v is not None}

    def create(self, db, **overrides):
        data = self.make(**overrides)
        obj = self.model(**data)
        db.add(obj)
        db.flush()
        return obj


def random_string(length: int = 10) -> str:
    return "".join(random.choices(string.ascii_lowercase, k=length))


def random_email() -> str:
    return f"{random_string(8)}@example.com"


def random_phone() -> str:
    return f"08{random.randint(100000000, 999999999)}"