# -*- coding: utf-8 -*-
from pydispatch import dispatcher
import abc

from media.monitor.log import Loggable
import media.monitor.pure as mmp

# Defines the handle interface
class Handles(object):
    __metaclass__ = abc.ABCMeta
    @abc.abstractmethod
    def handle(self, sender, event, *args, **kwargs): pass

# TODO : remove the code duplication between ReportHandler and
# ProblemFileHandler. Namely the part where both initialize pydispatch
# TODO : Investigate whether weak reffing in dispatcher.connect could possibly
# cause a memory leak

class ReportHandler(Handles):
    __metaclass__ = abc.ABCMeta
    def __init__(self, signal):
        self.signal = signal
        self.report_signal = "badfile"
        def dummy(sender, event): self.handle(sender,event)
        dispatcher.connect(dummy, signal=signal, sender=dispatcher.Any, weak=False)

    def report_problem_file(self, event, exception=None):
        dispatcher.send(signal=self.report_signal, sender=self, event=event, exception=exception)

class ProblemFileHandler(Handles, Loggable):
    def __init__(self, channel, **kwargs):
        self.channel = channel
        self.signal = self.channel.signal
        self.problem_dir = self.channel.path
        def dummy(sender, event, exception): self.handle(sender, event, exception)
        dispatcher.connect(dummy, signal=self.signal, sender=dispatcher.Any, weak=False)
        mmp.create_dir( self.problem_dir )
        self.logger.info("Initialized problem file handler. Problem dir: '%s'" % self.problem_dir)

    def handle(self, sender, event, exception=None):
        self.logger.info("Received problem file: '%s'. Supposed to move it to problem dir", event.path)
        try: mmp.move_to_dir(dir_path=self.problem_dir, file_path=event.path)
        except Exception as e:
            self.logger.info("Could not move file: '%s' to problem dir: '%s'" % (event.path, self.problem_dir))
            self.logger.info("Exception: %s" % str(e))