import os

from solo_tool.solo_tool import SoloTool

class SoloToolController:
    def __init__(self, soloTool: SoloTool):
        self._soloTool = soloTool

    def nextSong(self):
        current = self._soloTool.song
        if current is None:
            self._soloTool.song = 0
        else: 
            self._soloTool.song = current + 1

    def previousSong(self):
        current = self._soloTool.song
        if current is None:
            self._soloTool.song = 0
        else: 
            self._soloTool.song = current - 1