# Copyright (C) 2013-2015 Free Software Foundation, Inc.

# 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 3 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, see <http://www.gnu.org/licenses/>.

class Reporter(object):
    """Base class of reporter to report test results in a certain format.

    Subclass, which is specific to a report format, should overwrite
    methods report, start and end.
    """

    def __init__(self, append):
        """Constructor of Reporter.

        attribute append is used to determine whether to append or
        overwrite log file.
        """
        self.append = append

    def report(self, *args):
        raise NotImplementedError("Abstract Method:report.")

    def start(self):
        """Invoked when reporting is started."""
        raise NotImplementedError("Abstract Method:start.")

    def end(self):
        """Invoked when reporting is done.

        It must be overridden to do some cleanups, such as closing file
        descriptors.
        """
        raise NotImplementedError("Abstract Method:end.")

class TextReporter(Reporter):
    """Report results in a plain text file 'perftest.log'."""

    def __init__(self, append):
        super (TextReporter, self).__init__(Reporter(append))
        self.txt_log = None

    def report(self, *args):
        self.txt_log.write(' '.join(str(arg) for arg in args))
        self.txt_log.write('\n')

    def start(self):
        if self.append:
            self.txt_log = open ("perftest.log", 'a+');
        else:
            self.txt_log = open ("perftest.log", 'w');

    def end(self):
        self.txt_log.close ()