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# Copyright (c) 2017 Mark D. Hill and David A. Wood
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# Authors: Sean Wilson
#          Nikos Nikoleris

import os
import tempfile
import shutil
import sys
import socket
import threading
import urllib
import urllib2

from testlib.fixture import Fixture
from testlib.config import config, constants
from testlib.helper import log_call, cacheresult, joinpath, absdirpath
import testlib.log as log


class VariableFixture(Fixture):
    def __init__(self, value=None, name=None):
        super(VariableFixture, self).__init__(name=name)
        self.value = value


class TempdirFixture(Fixture):
    def __init__(self):
        self.path = None
        super(TempdirFixture, self).__init__(
                name=constants.tempdir_fixture_name)

    def setup(self, testitem):
        self.path = tempfile.mkdtemp(prefix='gem5out')

    def teardown(self, testitem):
        if self.path is not None:
            shutil.rmtree(self.path)

    def skip_cleanup(self):
        # Set path to none so it's not deleted
        self.path = None

class UniqueFixture(Fixture):
    '''
    Base class for fixtures that generate a target in the
    filesystem. If the same fixture is used by more than one
    test/suite, rather than creating a copy of the fixture, it returns
    the same object and makes sure that setup is only executed
    once. Devired classses should override the _init and _setup
    functions.

    :param target: The absolute path of the target in the filesystem.

    '''
    fixtures = {}

    def __new__(cls, target):
        if target in cls.fixtures:
            obj = cls.fixtures[target]
        else:
            obj = super(UniqueFixture, cls).__new__(cls)
            obj.lock = threading.Lock()
            obj.target = target
            cls.fixtures[target] = obj
        return obj

    def __init__(self, *args, **kwargs):
        with self.lock:
            if hasattr(self, '_init_done'):
                return
            super(UniqueFixture, self).__init__(self, **kwargs)
            self._init(*args, **kwargs)
            self._init_done = True

    def setup(self, testitem):
        with self.lock:
            if hasattr(self, '_setup_done'):
                return
            self._setup_done = True
            self._setup(testitem)


class SConsFixture(UniqueFixture):
    '''
    Fixture will wait until all SCons targets are collected and tests are
    about to be ran, then will invocate a single instance of SCons for all
    targets.

    :param directory: The directory which scons will -C (cd) into before
        executing. If None is provided, will choose the config base_dir.
    '''

    def __new__(cls, target):
        obj = super(SConsFixture, cls).__new__(cls, target)
        return obj

    def _setup(self, testitem):
        if config.skip_build:
            return

        command = [
            'scons', '-C', self.directory,
            '-j', str(config.threads),
            '--ignore-style'
        ]

        if not self.targets:
            log.test_log.warn(
                'No SCons targets specified, this will'
                ' build the default all target.\n'
                'This is likely unintended, and you'
                ' may wish to kill testlib and reconfigure.')
        else:
            log.test_log.message(
                    'Building the following targets.'
                    ' This may take a while.')
            log.test_log.message('%s' % (', '.join(self.targets)))
            log.test_log.message(
                    "You may want to run with only a single ISA"
                    "(--isa=), use --skip-build, or use 'rerun'.")

        command.extend(self.targets)
        if self.options:
            command.extend(self.options)
        log_call(log.test_log, command, stderr=sys.stderr)

class Gem5Fixture(SConsFixture):
    def __new__(cls, isa, variant, protocol=None):
        target_dir = joinpath(config.build_dir, isa.upper())
        if protocol:
            target_dir += '_' + protocol
        target = joinpath(target_dir, 'gem5.%s' % variant)
        obj = super(Gem5Fixture, cls).__new__(cls, target)
        return obj

    def _init(self, isa, variant, protocol=None):
        self.name = constants.gem5_binary_fixture_name

        self.targets = [self.target]
        self.path = self.target
        self.directory = config.base_dir

        self.options = []
        if protocol:
            self.options = [ '--default=' + isa.upper(),
                             'PROTOCOL=' + protocol ]
        self.set_global()

class MakeFixture(Fixture):
    def __init__(self, directory, *args, **kwargs):
        name = 'make -C %s' % directory
        super(MakeFixture, self).__init__(build_once=True, lazy_init=False,
                                          name=name,
                                          *args, **kwargs)
        self.targets = []
        self.directory = directory

    def setup(self):
        super(MakeFixture, self).setup()
        targets = set(self.required_by)
        command = ['make', '-C', self.directory]
        command.extend([target.target for target in targets])
        log_call(command)


class MakeTarget(Fixture):
    def __init__(self, target, make_fixture=None, *args, **kwargs):
        '''
        :param make_fixture: The make invocation we will be attached to.
        Since we don't have a single global instance of make in gem5 like we do
        scons we need to know what invocation to attach to. If none given,
        creates its own.
        '''
        super(MakeTarget, self).__init__(name=target, *args, **kwargs)
        self.target = self.name

        if make_fixture is None:
            make_fixture = MakeFixture(
                    absdirpath(target),
                    lazy_init=True,
                    build_once=False)

        self.make_fixture = make_fixture

        # Add our self to the required targets of the main MakeFixture
        self.require(self.make_fixture)

    def setup(self, testitem):
        super(MakeTarget, self).setup()
        self.make_fixture.setup()
        return self

class TestProgram(MakeTarget):
    def __init__(self, program, isa, os, recompile=False):
        make_dir = joinpath('test-progs', program)
        make_fixture = MakeFixture(make_dir)
        target = joinpath('bin', isa, os, program)
        super(TestProgram, self).__init__(target, make_fixture)
        self.path = joinpath(make_dir, target)
        self.recompile = recompile

    def setup(self, testitem):
        # Check if the program exists if it does then only compile if
        # recompile was given.
        if self.recompile:
            super(MakeTarget, self).setup()
        elif not os.path.exists(self.path):
            super(MakeTarget, self).setup()

class DownloadedProgram(UniqueFixture):
    """ Like TestProgram, but checks the version in the gem5 binary repository
        and downloads an updated version if it is needed.
    """

    def __new__(cls, url, path, filename):
        target = joinpath(path, filename)
        return super(DownloadedProgram, cls).__new__(cls, target)

    def _init(self, url, path, filename, **kwargs):
        """
        url: string
            The url of the archive
        path: string
            The absolute path of the directory containing the archive
        filename: string
            The name of the archive
        """

        self.url = url
        self.path = path
        self.filename = joinpath(path, filename)
        self.name = "Downloaded:" + self.filename

    def _download(self):
        import errno
        log.test_log.debug("Downloading " + self.url + " to " + self.path)
        if not os.path.exists(self.path):
            try:
                os.makedirs(self.path)
            except OSError as e:
                if e.errno != errno.EEXIST:
                    raise
        urllib.urlretrieve(self.url, self.filename)

    def _getremotetime(self):
        import datetime, time
        import _strptime # Needed for python threading bug

        u = urllib2.urlopen(self.url, timeout=10)
        return time.mktime(datetime.datetime.strptime( \
                    u.info().getheaders("Last-Modified")[0],
                    "%a, %d %b %Y %X GMT").timetuple())

    def _setup(self, testitem):
        # Check to see if there is a file downloaded
        if not os.path.exists(self.filename):
            self._download()
        else:
            try:
                t = self._getremotetime()
            except (urllib2.URLError, socket.timeout):
                # Problem checking the server, use the old files.
                log.test_log.debug("Could not contact server. Binaries may be old.")
                return
            # If the server version is more recent, download it
            if t > os.path.getmtime(self.filename):
                self._download()

class DownloadedArchive(DownloadedProgram):
    """ Like TestProgram, but checks the version in the gem5 binary repository
        and downloads an updated version if it is needed.
    """

    def _extract(self):
        import tarfile
        with tarfile.open(self.filename) as tf:
            tf.extractall(self.path)

    def _setup(self, testitem):
        # Check to see if there is a file downloaded
        if not os.path.exists(self.filename):
            self._download()
            self._extract()
        else:
            try:
                t = self._getremotetime()
            except (urllib2.URLError, socket.timeout):
                # Problem checking the server, use the old files.
                log.test_log.debug("Could not contact server. "
                                   "Binaries may be old.")
                return
            # If the server version is more recent, download it
            if t > os.path.getmtime(self.filename):
                self._download()
                self._extract()