from unittest import TestCase
try:
    import Zope2
except ImportError:
    # BBB: for Zope 2.7
    import Zope as Zope2
Zope2.startup()

import sys
import time
from os import chmod, curdir, mkdir, remove, stat, walk
from os.path import join, abspath, dirname
from shutil import copytree, rmtree
from stat import S_IREAD, S_IWRITE
from tempfile import mktemp

from AccessControl.SecurityManagement import newSecurityManager
from AccessControl.SecurityManagement import noSecurityManager
from AccessControl.SecurityManager import setSecurityPolicy
from Testing.makerequest import makerequest
import zLOG
try:
    import transaction
except ImportError:
    # BBB: for Zope 2.7
    from Products.CMFCore.utils import transaction

from dummy import DummyFolder
from security import AnonymousUser
from security import PermissiveSecurityPolicy

class LogInterceptor:

    _old_log_write = None
    logged = None

    def _catch_log_errors( self, ignored_level=zLOG.PROBLEM ):

        if self._old_log_write is not None:
            return

        def log_write(subsystem, severity, summary, detail, error):
            if severity > ignored_level:
                assert 0, "%s(%s): %s" % (subsystem, severity, summary)
            if self.logged is None:
                self.logged = []
            self.logged.append( ( subsystem, severity, summary, detail ) )

        self._old_log_write = zLOG.log_write
        zLOG.log_write = log_write

    def _ignore_log_errors( self ):

        if self._old_log_write is None:
            return

        zLOG.log_write = self._old_log_write
        del self._old_log_write

class WarningInterceptor:

    _old_stderr = None
    _our_stderr_stream = None

    def _trap_warning_output( self ):

        if self._old_stderr is not None:
            return

        import sys
        from StringIO import StringIO

        self._old_stderr = sys.stderr
        self._our_stderr_stream = sys.stderr = StringIO()

    def _free_warning_output( self ):

        if self._old_stderr is None:
            return

        import sys
        sys.stderr = self._old_stderr


class TransactionalTest( TestCase ):

    def setUp( self ):
        transaction.begin()
        self.connection = Zope2.DB.open()
        self.root =  self.connection.root()[ 'Application' ]

    def tearDown( self ):
        transaction.abort()
        self.connection.close()


class RequestTest( TransactionalTest ):

    def setUp(self):
        TransactionalTest.setUp(self)
        root = self.root = makerequest(self.root)
        self.REQUEST  = root.REQUEST
        self.RESPONSE = root.REQUEST.RESPONSE

    def tearDown(self):
        self.REQUEST.close()
        TransactionalTest.tearDown(self)

class SecurityTest( TestCase ):

    def setUp(self):
        transaction.begin()
        self._policy = PermissiveSecurityPolicy()
        self._oldPolicy = setSecurityPolicy(self._policy)
        self.connection = Zope2.DB.open()
        self.root =  self.connection.root()[ 'Application' ]
        newSecurityManager( None, AnonymousUser().__of__( self.root ) )

    def tearDown( self ):
        transaction.abort()
        self.connection.close()
        noSecurityManager()
        setSecurityPolicy(self._oldPolicy)


class SecurityRequestTest( SecurityTest ):

    def setUp(self):
        SecurityTest.setUp(self)
        self.root = makerequest(self.root)

    def tearDown(self):
        self.root.REQUEST.close()
        SecurityTest.tearDown(self)

try:
    __file__
except NameError:
    # Test was called directly, so no __file__ global exists.
    _prefix = abspath(curdir)
else:
    # Test was called by another test.
    _prefix = abspath(dirname(__file__))

_prefix = abspath(join(_prefix,'..'))


class FSDVTest( TestCase, WarningInterceptor ):
    # Base class for FSDV test, creates a fake skin
    # copy that can be edited.

    _sourceprefix = _prefix
    _skinname = 'fake_skins'
    _layername = 'fake_skin'

    def _registerDirectory(self, object=None, ignore=None):
        self._trap_warning_output()
        from Products.CMFCore.DirectoryView import registerDirectory
        from Products.CMFCore.DirectoryView import addDirectoryViews
        if ignore is None:
            from Products.CMFCore.DirectoryView import ignore
        registerDirectory(self._skinname, self.tempname, ignore=ignore)
        if object is not None:
            ob = self.ob = DummyFolder()
            addDirectoryViews(ob, self._skinname, self.tempname)

    def _writeFile(self, filename, stuff):
        # write some stuff to a file on disk
        # make sure the file's modification time has changed
        # also make sure the skin folder mod time has changed
        try:
            dir_mtime = stat(self.skin_path_name)[8]
        except:  # XXX Why bare except?
            dir_mtime = 0
        thePath = join(self.skin_path_name,filename)
        try:
            mtime1 = stat(thePath)[8]
        except:  # XXX Why bare except?
            mtime1 = 0
        mtime2 = mtime1
        while mtime2==mtime1:
            f = open(thePath,'w')
            f.write(stuff)
            f.close()
            mtime2 = stat(thePath)[8]
        self._addedOrRemoved(dir_mtime)


    def _deleteFile(self,filename):
        try:
            dir_mtime = stat(self.skin_path_name)[8]
        except:  # XXX Why bare except?
            dir_mtime = 0
        remove(join(self.skin_path_name, filename))
        self._addedOrRemoved(dir_mtime)


    def _addedOrRemoved(self, old_mtime):
        # Called after adding/removing a file from self.skin_path_name.
        
        if sys.platform == 'win32':
            # Windows doesn't reliably update directory mod times, so
            # DirectoryView has an expensive workaround.  The
            # workaround does not rely on directory mod times.
            return
        limit = time.time() + 60  # If it takes 60 seconds, give up.
        new_mtime = old_mtime
        while new_mtime == old_mtime:
            # Many systems have a granularity of 1 second.
            # Add/remove a file until it actually changes the
            # directory mod time.
            if time.time() > limit:
                raise RuntimeError(
                    "This platform (%s) does not update directory mod times "
                    "reliably." % sys.platform)
            time.sleep(0.1)
            fn = join(self.skin_path_name, '.touch')
            f = open(fn, 'w')
            f.write('Temporary file')
            f.close()
            remove(fn)
            new_mtime = stat(self.skin_path_name)[8]

    def setUp(self):
        # store the place where the skin copy will be created
        self.tempname = mktemp()
        # create the temporary folder
        mkdir(self.tempname)
        # copy the source fake skin to the new location
        copytree(join(self._sourceprefix,
                      self._skinname),
                 join(self.tempname,
                      self._skinname))
        # make sure we have a writable copy
        for root, dirs, files in walk(self.tempname):
            for name in files:
                chmod(join(root, name), S_IREAD+S_IWRITE)
        # store the skin path name
        self.skin_path_name = join(self.tempname,self._skinname,self._layername)

    def tearDown(self):
        self._free_warning_output()
        # kill the copy
        try:
            rmtree(self.tempname)
        except OSError:
            # try again (some files might be locked temporarily)
            time.sleep(0.1)
            rmtree(self.tempname)
