# Scroller object within which the base text string is stored, and the current
# list of visible characters is maintained and updated.

from . import character


class Scroller:
    def __init__(self, text):
        self.text = text
        self.next_char = 0
        self.sheet_chars = []

    # obtains the next character adds it to the list of characters to render.
    def get_next_char(self,
                      x=0,
                      y=0,
                      x_speed=0.1,
                      y_speed=0.1,
                      angle=0,
                      radius=20):
        self.sheet_chars.append(character.Character(x,
                                                    y,
                                                    x_speed,
                                                    y_speed,
                                                    angle,
                                                    radius,
                                                    self.text[self.next_char]))

        if (self.next_char < (len(self.text) - 1)):
            self.next_char += 1
        else:
            self.next_char = 0

    # Removes a character from the render list, usually as a result of leaving
    # the screen.
    def delete_first_char(self):
        self.sheet_chars.pop(0)