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#!/usr/bin/env python3.6
# note http://docs.python.org/lib/module-doctest.html
# resp. file:///usr/share/doc/python-docs-*/html/lib/module-doctest.html
# FIXME
# read https://www.toptal.com/python/an-introduction-to-mocking-in-python
#      & https://blog.fugue.co/2016-02-11-python-mocking-101.html
#      for unittest.mock tutorials
# for testing
import argparse
import configparser
import email
import logging
import os
import sys
from datetime import date

logging.basicConfig(format='%(levelname)s:%(funcName)s:%(message)s',
                    stream=sys.stdout, level=logging.DEBUG)
log = logging.getLogger('imapArch')

# from java.util import Properties, Date
# from java.lang import System
# from javax.mail import *
# from jarray import array


class FolderNotFoundError(IOError):
    pass


def __getMessageDate(msg):
    """
    Return the date of the message

    @param msg analyzed message
    @return GregorianCalendar of the messages date
    @throws MessagingException
    """
    dateMS = msg.getReceivedDate().getTime() // 1000
    dateStruct = date.fromtimestamp(dateMS)
    return dateStruct


class ArchivableFolder(list):

    def __init__(self, source, year):
        """
        Constructor for the folder.

        @param source folder from the messages should be archived
        @param year   int of the year for which the messages are
            archived
        """
        self.sourceFolder = source
        targetName = self.__getArchiveFolderName(source.getFullName(), year)
        self.targetFolder = self.sourceFolder.getFolder(targetName)

    def __getArchiveFolderName(self, srcFldName, year):
        """
        @param folder string with the folder name
        @param year   int
        @return
        """
        archFolder = "INBOX/Archiv/"
        rootLen = len("INBOX/")
        if not(srcFldName[:rootLen] == "/INBOX/"):
            raise FolderNotFoundError(
                "We expect all folders to be under INBOX folder.")
        baseName = srcFldName[rootLen:]
        archFolder = "/" + archFolder + year + "/" + baseName
        return archFolder

    def add(self, msg):
        self.append(msg)

    def doArchive(self):
        for message in self:
            log.debug("Moving %s from %s to %s.",
                      message, self.sourceFolder.getFullName(),
                      self.targetFolder.getFullName())
            # self.sourceFolder.copyMessages(array(self, Message),
            #                                self.targetFolder)
            # for message in self:
            #     message.setFlag(Flags.Flag.DELETED, true)
            # self.sourceFolder.expunge()


class Archives(dict):
    """Collects archivable folders indexed by tuple of
    folderName and year
    """

    def __init__(self):
        pass

    def add(self, msg):
        """
        Check whether the ArchivableFolder (@see ArchivableFolder)
        for the particular year actually exists, and if not then create
        it. In any event add
        @param msg
        """
        fld = msg.getFolder()
        msgDate = __getMessageDate(msg)
        year = msgDate.year

        if not(self.search(fld, year)):
            archfld = ArchivableFolder(fld, year)
            self[self.__createKey(fld, year)] = archfld

    def __createKey(self, name, year):
        """
        Create a key for the list
        @param fldName String with the full name of the folder
        @param year int of the year of the messages to be stored
            there
        @return tuple consisting from the both parameters of
            this function.
        """
        return(name, year)

    def search(self, fld, year):
        """
        Find out whether the object with the key consisting of
        the folder name and year exists in this object.

        @param fld  Folder where the message is stored
        @param year int year of the message date
        @return boolean saying whether the folder for this message
                        has been already added to this object.
        """
        key = self.__createKey(fld.getFullName(), year)
        return key in self

    def archive(self):
        for key in self:
            self.doArchive()


class ArchivedStore(object):
    """
    TODO Make Archive store into context manager.
    """

    def __init__(self, serverKey=None):
        config = configparser.ConfigParser()
        config.read(os.path.expanduser('~/.config/imap_archiver.cfg'))
        acc_name = serverKey if serverKey is not None \
            else config['general']['account']
        self.cfg = dict(config.items(acc_name))
        # if debug:
        #     self.session.setDebug(True)
        # try:
        #     self.store = self.session.getStore("imaps")
        # except:
        #     print >> sys.stderr, "Cannot get Store"
        #     raise

        self._threeMonthAgo = date.today()
        newmonth = self._threeMonthAgo.month - 3
        self._threeMonthAgo = self._threeMonthAgo.replace(month=newmonth)

        log.debug("host = %s, user = %s, password = %s",
                  self.cfg['host'], self.cfg['username'],
                  self.cfg['password'])

        self.__login(host, user, password)

    def __login(self, server, user, password):
        try:
            self.store.connect(server, user, password)
        except:
            log.debug("Cannot connect to %s as %s with password %s",
                      server, user, password)
            raise

    def archive(self):
        inboxfolder = self.store.getDefaultFolder().getFolder("INBOX")
        folderList = inboxfolder.list('*')

        for folder in folderList:
            if folder.getFullName()[:len("INBOX/Archiv")] != "INBOX/Archiv":
                archMsgsCnt = self.__archiveFolder(folder)
                # folder.close(False)
                print("Processed messages = %d" % archMsgsCnt)

    def __archiveFolder(self, fld):
        fld.open(Folder.READ_WRITE)
        for msg in fld.getMessages():
            msgDate = __getMessageDate(msg)
            print >>sys.stderr, str(msgDate), str(self._threeMonthAgo)
            if msgDate < self._threeMonthAgo:
                archFolder = self.__getArchiveFolderName(msg)
#                print >> sys.stderr, archFolder
#                fld.copyMessages(array([msg],type(msg)), archFolder)
#                msg.setFlag(Flags.Flag.DELETED, true)
                print("%s -> %s : %s" % (fld.getFullName(),
                                         archFolder.getFullName(), msgDate))
        folderLen = len(fld.getMessages())
        fld.close(False)
        return(folderLen)

if __name__ == '__main__':
    argp = argparse.ArgumentParser()
    argp.add_argument('server',
                      help='Symbolic name of the server to be used')
    argp.add_argument('folder',
                      help='Folder which should be archived')
    argp.add_argument('archive',
                      help='Root folder to store annual archives to')
    args = argp.parse_args()

    with ArchivedStore() as myStore:
        myStore.archive()