class InputManager:

    currently_pressed_keys = []

    left_paw_keys = []
    right_paw_keys = []
    shifted_keys = {}

    def init(self, linux):
        if linux:
            import keylist_linux_fi as keys
        else:
            import keylist_win_fi as keys

        self.shifted_keys = keys.shifted_keys

        for key in keys.right_paw_keys:
            self.right_paw_keys.append(key.lower())

        for key in keys.left_paw_keys:
            self.left_paw_keys.append(key.lower())

    def on_update(self, down):
        pass

    def press_key(self, key):
        key = key.lower()
        if not key in self.currently_pressed_keys:
            self.currently_pressed_keys.append(key)
            self.on_update(True)

    def release_key(self, key):
        key = key.lower()
        if key in self.currently_pressed_keys:
            self.currently_pressed_keys.remove(key)
            self.on_update(False)

        shifted = self.shifted_keys.get(key)
        if shifted != None:
            shifted = shifted.lower()
        if shifted in self.currently_pressed_keys:
            self.currently_pressed_keys.remove(key)
            self.on_update(False)

    def left_keys_pressed(self):
        pressed = False
        for key in self.currently_pressed_keys:
            if key in self.left_paw_keys:
                pressed = True
        return pressed

    def right_keys_pressed(self):
        pressed = False
        for key in self.currently_pressed_keys:
            if key in self.right_paw_keys:
                pressed = True
        return pressed