from ..util.singleton import Singleton
from .color import Color
from .level import Level


class Messenger(metaclass=Singleton):
    def __init__(self, level=Level.LOWINFO):
        self.set_level(level)
        self.use_color(True)

    def set_level(self, level):
        self._level = level

    def use_color(self, yesno):
        self._use_color = yesno

    def log(self, level, message):
        if level >= self._level:
            print("%s%s%s" % (self._color(level), message, self._reset()))

    def debug(self, message):
        self.log(Level.DEBUG, message)

    def lowinfo(self, message):
        self.log(Level.LOWINFO, message)

    def info(self, message):
        self.log(Level.INFO, message)

    def warning(self, message):
        self.log(Level.WARNING, message)

    def error(self, message):
        self.log(Level.ERROR, message)

    def _color(self, level):
        """
        Get a color (terminal escape sequence) according to a level.
        """
        if not self._use_color:
            return ""
        elif level < Level.DEBUG:
            return ""
        elif Level.DEBUG <= level < Level.LOWINFO:
            return Color.YELLOW
        elif Level.LOWINFO <= level < Level.INFO:
            return Color.BLUE
        elif Level.INFO <= level < Level.WARNING:
            return Color.GREEN
        elif Level.WARNING <= level < Level.ERROR:
            return Color.MAGENTA
        elif Level.ERROR <= level:
            return Color.RED

    def _reset(self):
        """
        Get a reset color (terminal escape sequence).
        """
        if not self._use_color:
            return ""
        else:
            return Color.RESET