# Copyright (C) 2012- Sebastian Spaeth & contributors
#
#    This program is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation; either version 2 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program; if not, write to the Free Software
#    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
import unittest
import logging
import os
import sys
import shutil
import subprocess
import tempfile
from ConfigParser import SafeConfigParser
from . import default_conf

class OLITestLib():
    cred_file = None
    testdir = None
    """Absolute path of the current temporary test directory"""
    cmd = None
    """command that will be executed to invoke offlineimap"""

    def __init__(self, cred_file = None, cmd='offlineimap'):
        """

        :param cred_file: file of the configuration
            snippet for authenticating against the test IMAP server(s).
        :param cmd: command that will be executed to invoke offlineimap"""
        OLITestLib.cred_file = cred_file
        if not os.path.isfile(cred_file):
            raise UserWarning("Please copy 'credentials.conf.sample' to '%s' "
                "and set your credentials there." % cred_file)
        OLITestLib.cmd = cmd

    @classmethod
    def create_test_dir(cls, suffix=''):
        """Creates a test directory and places OLI config there

        Note that this is a class method. There can only be one test
        directory at a time. OLITestLib is not suited for running
        several tests in parallel.  The user is responsible for
        cleaning that up herself."""
        # creating temporary dir for testing in same dir as credentials.conf
        cls.testdir = os.path.abspath(
            tempfile.mkdtemp(prefix='tmp_%s_'%suffix,
                             dir=os.path.dirname(cls.cred_file)))
        cls.create_config_file()
        return cls.testdir

    @classmethod
    def create_config_file(cls):
        """Creates a OLI configuration file

        It is created in testdir (so create_test_dir has to be called
        earlier) using the credentials information given (so they had to
        be set earlier). Failure to do either of them will raise an
        AssertionException."""
        assert cls.cred_file != None
        assert cls.testdir != None
        config = SafeConfigParser()
        config.readfp(default_conf)
        config.read(cls.cred_file)
        config.set("general", "metadata", cls.testdir)
        localfolders = os.path.join(cls.testdir, 'mail')
        config.set("Repository Maildir", "localfolders", localfolders)
        with open(os.path.join(cls.testdir, 'offlineimap.conf'), "wa") as f:
            config.write(f)

    @classmethod
    def delete_test_dir(cls):
        """Deletes the current test directory

        The users is responsible for cleaning that up herself."""
        if os.path.isdir(cls.testdir):
            shutil.rmtree(cls.testdir)

    @classmethod
    def run_OLI(cls):
        """Runs OfflineImap

        :returns: (rescode, stdout)
        """
        try:
            output = subprocess.check_output(
                [cls.cmd,
                 "-c%s" % os.path.join(cls.testdir, 'offlineimap.conf')],
                shell=False)
        except subprocess.CalledProcessError as e:
            return (e.returncode, e.output)
        return (0, output)

    @classmethod
    def create_maildir(cls, folder):
        """Create empty maildir 'folder' in our test maildir

        Does not fail if it already exists"""
        assert cls.testdir != None
        maildir = os.path.join(cls.testdir, 'mail', folder)
        for subdir in ('','tmp','cur','new'):
            try:
                os.makedirs(os.path.join(maildir, subdir))
            except OSError as e:
                if e.errno != 17: # 'already exists' is ok.
                    raise

    @classmethod
    def count_maildir_mails(cls, folder):
        """Returns the number of mails in maildir 'folder'

        Counting only those in cur&new (ignoring tmp)."""
        assert cls.testdir != None
        maildir = os.path.join(cls.testdir, 'mail', folder)

        boxes, mails = 0, 0
        for dirpath, dirs, files in os.walk(maildir, False):
            if set(dirs) == set(['cur', 'new', 'tmp']):
                # New maildir folder
                boxes += 1
                #raise RuntimeError("%s is not Maildir" % maildir)
            if dirpath.endswith(('/cur', '/new')):
                mails += len(files)
        return boxes, mails