# vim: tabstop=4 shiftwidth=4 softtabstop=4

# Copyright (c) 2010 OpenStack, LLC
# All Rights Reserved.
#
#    Licensed under the Apache License, Version 2.0 (the "License");
#    you may not use this file except in compliance with the License.
#    You may obtain a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS,
#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#    See the License for the specific language governing permissions and
#    limitations under the License.

# Colorizer Code is borrowed from Twisted:
# Copyright (c) 2001-2010 Twisted Matrix Laboratories.
#
#    Permission is hereby granted, free of charge, to any person obtaining
#    a copy of this software and associated documentation files (the
#    "Software"), to deal in the Software without restriction, including
#    without limitation the rights to use, copy, modify, merge, publish,
#    distribute, sublicense, and/or sell copies of the Software, and to
#    permit persons to whom the Software is furnished to do so, subject to
#    the following conditions:
#
#    The above copyright notice and this permission notice shall be
#    included in all copies or substantial portions of the Software.
#
#    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
#    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
#    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
#    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
#    LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
#    OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
#    WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

import sys
import unittest

from nose import core
from nose import result

from quantum.common import constants


class _AnsiColorizer(object):
    """
    A colorizer is an object that loosely wraps around a stream, allowing
    callers to write text to the stream in a particular color.

    Colorizer classes must implement C{supported()} and C{write(text, color)}.
    """
    _colors = dict(black=30, red=31, green=32, yellow=33,
                   blue=34, magenta=35, cyan=36, white=37)

    def __init__(self, stream):
        self.stream = stream

    def supported(cls, stream=sys.stdout):
        """
        A class method that returns True if the current platform supports
        coloring terminal output using this method. Returns False otherwise.
        """
        if not stream.isatty():
            return False  # auto color only on TTYs
        try:
            import curses
        except ImportError:
            return False
        else:
            try:
                try:
                    return curses.tigetnum("colors") > 2
                except curses.error:
                    curses.setupterm()
                    return curses.tigetnum("colors") > 2
            except:
                raise
                # guess false in case of error
                return False
    supported = classmethod(supported)

    def write(self, text, color):
        """
        Write the given text to the stream in the given color.

        @param text: Text to be written to the stream.

        @param color: A string label for a color. e.g. 'red', 'white'.
        """
        color = self._colors[color]
        self.stream.write('\x1b[%s;1m%s\x1b[0m' % (color, text))


class _Win32Colorizer(object):
    """
    See _AnsiColorizer docstring.
    """
    def __init__(self, stream):
        from win32console import GetStdHandle, STD_OUT_HANDLE
        from win32console import FOREGROUND_RED, FOREGROUND_BLUE
        from win32console import FOREGROUND_GREEN, FOREGROUND_INTENSITY
        red, green, blue, bold = (FOREGROUND_RED, FOREGROUND_GREEN,
                                  FOREGROUND_BLUE, FOREGROUND_INTENSITY)
        self.stream = stream
        self.screenBuffer = GetStdHandle(STD_OUT_HANDLE)
        self._colors = {
            'normal': red | green | blue,
            'red': red | bold,
            'green': green | bold,
            'blue': blue | bold,
            'yellow': red | green | bold,
            'magenta': red | blue | bold,
            'cyan': green | blue | bold,
            'white': red | green | blue | bold}

    def supported(cls, stream=sys.stdout):
        try:
            import win32console
            screenBuffer = win32console.GetStdHandle(
                win32console.STD_OUT_HANDLE)
        except ImportError:
            return False
        import pywintypes
        try:
            screenBuffer.SetConsoleTextAttribute(
                win32console.FOREGROUND_RED |
                win32console.FOREGROUND_GREEN |
                win32console.FOREGROUND_BLUE)
        except pywintypes.error:
            return False
        else:
            return True
    supported = classmethod(supported)

    def write(self, text, color):
        color = self._colors[color]
        self.screenBuffer.SetConsoleTextAttribute(color)
        self.stream.write(text)
        self.screenBuffer.SetConsoleTextAttribute(self._colors['normal'])


class _NullColorizer(object):
    """
    See _AnsiColorizer docstring.
    """
    def __init__(self, stream):
        self.stream = stream

    def supported(cls, stream=sys.stdout):
        return True
    supported = classmethod(supported)

    def write(self, text, color):
        self.stream.write(text)


class QuantumTestResult(result.TextTestResult):
    def __init__(self, *args, **kw):
        result.TextTestResult.__init__(self, *args, **kw)
        self._last_case = None
        self.colorizer = None
        # NOTE(vish, tfukushima): reset stdout for the terminal check
        stdout = sys.__stdout__
        sys.stdout = sys.__stdout__
        for colorizer in [_Win32Colorizer, _AnsiColorizer, _NullColorizer]:
            if colorizer.supported():
                self.colorizer = colorizer(self.stream)
                break
        sys.stdout = stdout

    def getDescription(self, test):
        return str(test)

    # NOTE(vish, tfukushima): copied from unittest with edit to add color
    def addSuccess(self, test):
        unittest.TestResult.addSuccess(self, test)
        if self.showAll:
            self.colorizer.write("OK", 'green')
            self.stream.writeln()
        elif self.dots:
            self.stream.write('.')
            self.stream.flush()

    # NOTE(vish, tfukushima): copied from unittest with edit to add color
    def addFailure(self, test, err):
        unittest.TestResult.addFailure(self, test, err)
        if self.showAll:
            self.colorizer.write("FAIL", 'red')
            self.stream.writeln()
        elif self.dots:
            self.stream.write('F')
            self.stream.flush()

    # NOTE(vish, tfukushima): copied from unittest with edit to add color
    def addError(self, test, err):
        """Overrides normal addError to add support for errorClasses.
        If the exception is a registered class, the error will be added
        to the list for that class, not errors.
        """
        stream = getattr(self, 'stream', None)
        ec, ev, tb = err
        try:
            exc_info = self._exc_info_to_string(err, test)
        except TypeError:
            # This is for compatibility with Python 2.3.
            exc_info = self._exc_info_to_string(err)
        for cls, (storage, label, isfail) in self.errorClasses.items():
            if result.isclass(ec) and issubclass(ec, cls):
                if isfail:
                    test.passwd = False
                storage.append((test, exc_info))
                # Might get patched into a streamless result
                if stream is not None:
                    if self.showAll:
                        message = [label]
                        detail = result._exception_details(err[1])
                        if detail:
                            message.append(detail)
                        stream.writeln(": ".join(message))
                    elif self.dots:
                        stream.write(label[:1])
                return
        self.errors.append((test, exc_info))
        test.passed = False
        if stream is not None:
            if self.showAll:
                self.colorizer.write("ERROR", 'red')
                self.stream.writeln()
            elif self.dots:
                stream.write('E')

    def startTest(self, test):
        unittest.TestResult.startTest(self, test)
        current_case = test.test.__class__.__name__

        if self.showAll:
            if current_case != self._last_case:
                self.stream.writeln(current_case)
                self._last_case = current_case
            #NOTE(salvatore-orlando):
            #slightly changed in order to print test case class
            #together with unit test name
            self.stream.write(
                '    %s' % str(test.test).ljust(60))
            self.stream.flush()


class QuantumTestRunner(core.TextTestRunner):
    def _makeResult(self):
        return QuantumTestResult(self.stream,
                                 self.descriptions,
                                 self.verbosity,
                                 self.config)


def run_tests(c=None):
    # NOTE(bgh): I'm not entirely sure why but nose gets confused here when
    # calling run_tests from a plugin directory run_tests.py (instead of the
    # main run_tests.py).  It will call run_tests with no arguments and the
    # testing of run_tests will fail (though the plugin tests will pass).  For
    # now we just return True to let the run_tests test pass.
    if not c:
        return True

    runner = QuantumTestRunner(stream=c.stream,
                               verbosity=c.verbosity,
                               config=c)
    return not core.run(config=c, testRunner=runner)

# describes parameters used by different unit/functional tests
# a plugin-specific testing mechanism should import this dictionary
# and override the values in it if needed (e.g., run_tests.py in
# quantum/plugins/openvswitch/ )
test_config = {
    "plugin_name": "",
    "default_net_op_status": constants.NET_STATUS_ACTIVE,
    "default_port_op_status": constants.PORT_STATUS_ACTIVE,
}
