
__author__    = "Radical.Utils Development Team (Andre Merzky, Ole Weidner)"
__copyright__ = "Copyright 2013, RADICAL@Rutgers"
__license__   = "MIT"


import os
import sys
import nose

import singleton as rs
import read_json as rj


# ------------------------------------------------------------------------------
#
_test_config = {}


# ------------------------------------------------------------------------------
#
def get_test_config () :

    return _test_config


# ------------------------------------------------------------------------------
#
class TestConfig (dict) :

    def __init__ (self, cfg_file, cfg_name=None) :

        config = rj.read_json (cfg_file)

        if  cfg_name and cfg_name in config :
            self._cfg = config[cfg_name]
        else :
            self._cfg = config

        global _test_config
        _test_config = self

        dict.__init__ (self, self._cfg)

        self.changed_values = {}
        self.__initialized  = True

    def __setitem__(self, key, value):
        self.changed_values[key] = value
        super(TestConfig, self).__setitem__(key, value)

    def __getattr__(self, item):
        """Maps values to attributes.
        Only called if there *isn't* an attribute with this name
        """
        try:
            return self.__getitem__(item)
        except KeyError:
            return None

    def __setattr__(self, item, value):
        """Maps attributes to values.
        Only if we are initialised
        """
        if not self.__dict__.has_key('_D__initialized'):  # this test allows attributes to be set in the __init__ method
            return dict.__setattr__(self, item, value)
        elif self.__dict__.has_key(item):       # any normal attributes are handled normally
            dict.__setattr__(self, item, value)
        else:
            self.__setitem__(item, value)


# ------------------------------------------------------------------------------
#
class Testing (object) :

    # --------------------------------------------------------------------------
    #
    def __init__ (self, modname, basedir) :
        """
        The given basedir is assumed to be `tests/` beneath the module tree to
        be tested.  We further assume a directory `tests/unittests/` to exist
        and to contain the actual set of test scripts.
        """

        self._testdir = "%s/unittests/" % os.path.dirname (os.path.realpath (basedir))

        try:
            module = __import__ (modname)
        
        except Exception, e:
            srcdir = "%s/../" % os.path.dirname (os.path.realpath (basedir))
            sys.path.insert (0, os.path.abspath(srcdir))
            module = __import__ (modname)


        print "______________________________________________________________________"
        print "Using %s from: %s" % (modname, module.__path__[0])
        print "______________________________________________________________________"


    # --------------------------------------------------------------------------
    #
    def run (self) :
        """

        This method runs a set of unit tests, which are organized in a directory
        structure under ``tests/unittests/`` -- each sub-directory in that
        hierarchy represents a test suite to be run.
        
        The unit tests in the individual test suites will have access to the
        same configuration info (parameter test_config), and will use the given
        parameters to set up the test environment.  For example, the saga-python
        api/job/test_service.py unit test will use the following::
        
            import saga.utils.test_config as sutc
            ...
        
            tc = sutc.TestConfig ('test.cfg')
            js = saga.job.Service (tc['js_url'], tc['session'])
        
        The :class:`saga.utils.test_config.TestConfig` class will expose the currently
        active test configuration -- which is activated in the *run_unittests* script
        as follows::
        
            tc = sutc.TestConfig (cfg_name)
        
        Since :class:`saga.utils.test_config.TestConfig` is
        a :class:`saga.utils.singleton.Singleton`, the thusly set state will be shared
        with the test suites as shown.
        
        """
        
        tc = get_test_config ()

        results = list()

        # fall back to no subtree structure if no test suites are specified
        if  not 'test_suites' in tc \
        or  not tc['test_suites'] :
            tc['test_suites'] = ['.']

        verbosity_env  = os.getenv('NOSE_VERBOSE', 1)
        verbosity_nose = None

        try    : verbosity_nose = int(verbosity_env)
        except : pass

        try    : verbosity_nose = {'ERROR'   : 1,
                                   'WARNING' : 2,
                                   'INFO'    : 3, 
                                   'DEBUG'   : 4}[verbosity_env]
        except : pass

        if  verbosity_nose == None:
            verbosity_nose =  2

        # run all test suites from the config
        for test_suite in tc['test_suites'] :

            # configure the unit test framework
            config = nose.config.Config ()
        
            config.verbosity  = verbosity_nose
            config.workingDir = self._testdir + '/' + test_suite
            config.stream     = sys.stderr
        
            # and run tests
            print "______________________________________________________________________"
            print "%s" % test_suite
            print "______________________________________________________________________"
            rc = nose.core.run (argv=[sys.argv[0]], config=config)
            results.append(rc)
            print "RC: %s" % rc
            print "______________________________________________________________________"
        
        # if we get a 'false' results it means that something went wrong. in
        # that case we return a non-zero exit code
        
        if False in results:
            return -1
        else:
            return 0


# --------------------------------------------------------------------
#


