lazy.py

from munch import munchify


class Locator:
    locator_kinds = {"id", "xpath"}
    _context = None

    def __init__(self, *args, **kwargs):
        self.valid_parameters = [f"find_by__{kind}" for kind in self.locator_kinds]
        self._locators = {}
        for param, value in kwargs.items():
            if param not in self.valid_parameters:
                raise TypeError(f"You need to pass a valid locator: {self.locator_kinds}")
            else:
                identifier = param[9:]
                if identifier not in self._locators:
                    self._locators[identifier] = value
        # parameters = []
        # if "find_by" not in kwargs:
        #     raise TypeError("You need to specify find_by argument")

    @property
    def context(self):
        if not hasattr(self, "_context"):
            raise TypeError("Context not settled")
        return getattr(self, "_context")

    @context.setter
    def context(self, value):
        print("setting context")
        setattr(self, "_context", value)
        setattr(self, "_munch_context", munchify(value))

    def _get_element(self):
        for loc, value in self._locators.items():
            if value in self._munch_context.driver:
                return getattr(self._munch_context.driver, value)
        raise IndexError("Not found element in driver")

    def __getattr__(self, item):
        el_instance = self._get_element()
        attr = getattr(el_instance, item)

        if not callable(attr):
            return attr

        def wrapper(*args, **kwargs):
            return attr(*args, **kwargs)

        return wrapper


class Screen(object):
    def __new__(cls, *args, **kwargs):
        ctx_in_args = len(args) > 0
        if not ctx_in_args:
            raise TypeError("No context provided")
        context = args[0]
        instance = object.__new__(cls)
        instance.__init__(*args, **kwargs)
        elements = [getattr(instance, el) for el in dir(instance) if
                    isinstance(getattr(instance, el), Locator)]
        for el in elements:
            setattr(el, "context", context)
        return instance


class LoginScreen(Screen):
    understand_button = Locator(find_by__id="btn")
    terms_text = Locator(find_by__id="txt")

    def click_to_understand(self):
        self.understand_button.click()

    def terms_is_right(self):
        print(self.terms_text.value == "Test")


if __name__ == '__main__':
    class B:
        content = "Clicked"

        def click(self):
            print(self.content)

    class C:
        @property
        def value(self):
            return "Test"

    context = {"driver": {"btn": B(), "txt": C()}}
    s = LoginScreen(context)
    s.click_to_understand()
    s.terms_is_right()
    B.content = "Changed"
    s.click_to_understand()