# Copyright (C) 2013-2017 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/>.

from __future__ import absolute_import

import perftest.testresult as testresult
import perftest.reporter as reporter
from perftest.measure import Measure
from perftest.measure import MeasurementCpuTime
from perftest.measure import MeasurementWallTime
from perftest.measure import MeasurementVmSize


class TestCase(object):
    """Base class of all performance testing cases.

    Each sub-class should override methods execute_test, in which
    several GDB operations are performed and measured by attribute
    measure.  Sub-class can also override method warm_up optionally
    if the test case needs warm up.
    """

    def __init__(self, name, measure):
        """Constructor of TestCase.

        Construct an instance of TestCase with a name and a measure
        which is to measure the test by several different measurements.
        """

        self.name = name
        self.measure = measure

    def execute_test(self):
        """Abstract method to do the actual tests."""
        raise NotImplementedError("Abstract Method.")

    def warm_up(self):
        """Do some operations to warm up the environment."""
        pass

    def run(self, warm_up=True, append=True):
        """Run this test case.

        It is a template method to invoke method warm_up,
        execute_test, and finally report the measured results.
        If parameter warm_up is True, run method warm_up.  If parameter
        append is True, the test result will be appended instead of
        overwritten.
        """
        if warm_up:
            self.warm_up()

        self.execute_test()
        self.measure.report(reporter.TextReporter(append), self.name)

class TestCaseWithBasicMeasurements(TestCase):
    """Test case measuring CPU time, wall time and memory usage."""

    def __init__(self, name):
        result_factory = testresult.SingleStatisticResultFactory()
        measurements = [MeasurementCpuTime(result_factory.create_result()),
                        MeasurementWallTime(result_factory.create_result()),
                        MeasurementVmSize(result_factory.create_result())]
        super (TestCaseWithBasicMeasurements, self).__init__ (name, Measure(measurements))
