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import glob
import logging
import os
import re
import shutil
import sys
import tempfile
import unittest

import six

from chirp import directory

from tests import run_tests


LOG = logging.getLogger('testadapter')


class TestAdapterMeta(type):
    def __new__(cls, name, parents, dct):
        return super(TestAdapterMeta, cls).__new__(cls, name, parents, dct)


class TestAdapter(unittest.TestCase):
    RADIO_CLASS = None
    SOURCE_IMAGE = None
    RADIO_INST = None
    testwrapper = None

    def shortDescription(self):
        test = self.id().split('.')[-1].replace('test_', '').replace('_', ' ')
        return 'Testing %s %s' % (self.RADIO_CLASS.get_name(), test)

    @classmethod
    def setUpClass(cls):
        if not cls.testwrapper:
            # Initialize the radio once per class invocation to save
            # bitwise parse time
            # Do this for things like Generic_CSV, that demand it
            _base, ext = os.path.splitext(cls.SOURCE_IMAGE)
            cls.testimage = tempfile.mktemp(ext)
            shutil.copy(cls.SOURCE_IMAGE, cls.testimage)
            cls.testwrapper = run_tests.TestWrapper(cls.RADIO_CLASS,
                                                    cls.testimage)

    @classmethod
    def tearDownClass(cls):
        os.remove(cls.testimage)

    def _runtest(self, test):
        tw = run_tests.TestWrapper(self.RADIO_CLASS,
                                   self.testimage,
                                   dst=self.RADIO_INST)
        testcase = test(tw)
        testcase.prepare()
        try:
            failures = testcase.run()
            if failures:
                raise failures[0]
        except run_tests.TestCrashError as e:
            raise e.get_original_exception()
        except run_tests.TestSkippedError as e:
            raise unittest.SkipTest(str(e))
        finally:
            testcase.cleanup()

    def test_copy_all(self):
        self._runtest(run_tests.TestCaseCopyAll)

    def test_brute_force(self):
        self._runtest(run_tests.TestCaseBruteForce)

    def test_edges(self):
        self._runtest(run_tests.TestCaseEdges)

    def test_settings(self):
        self._runtest(run_tests.TestCaseSettings)

    def test_banks(self):
        self._runtest(run_tests.TestCaseBanks)

    def test_detect(self):
        self._runtest(run_tests.TestCaseDetect)

    def test_clone(self):
        self._runtest(run_tests.TestCaseClone)


def _get_sub_devices(rclass, testimage):
    try:
        tw = run_tests.TestWrapper(rclass, None)
    except Exception as e:
        tw = run_tests.TestWrapper(rclass, testimage)

    rf = tw.do("get_features")
    if rf.has_sub_devices:
        return tw.do("get_sub_devices")
    else:
        return [rclass]


class RadioSkipper(unittest.TestCase):
    def test_is_supported_by_environment(self):
        raise unittest.SkipTest('Running in py3 and driver is not supported')


def load_tests(loader, tests, pattern, suite=None):
    if not suite:
        suite = unittest.TestSuite()

    base = os.path.dirname(os.path.abspath(__file__))
    base = os.path.join(base, 'images')
    images = glob.glob(os.path.join(base, "*"))
    tests = {img: os.path.splitext(os.path.basename(img))[0] for img in images}

    if pattern == 'test*.py':
        # This default is meaningless for us
        pattern = None

    for image, test in tests.items():
        try:
            rclass = directory.get_radio(test)
        except Exception:
            if six.PY3 and 'CHIRP_DEBUG' in os.environ:
                LOG.error('Failed to load %s' % test)
                continue
            raise
        for device in _get_sub_devices(rclass, image):
            class_name = 'TestCase_%s' % (
                ''.join(filter(lambda c: c.isalnum(),
                               device.get_name())))
            if isinstance(device, type):
                dst = None
            else:
                dst = device
                device = device.__class__
            tc = TestAdapterMeta(
                class_name, (TestAdapter,), dict(RADIO_CLASS=device,
                                                 SOURCE_IMAGE=image,
                                                 RADIO_INST=dst))
            tests = loader.loadTestsFromTestCase(tc)

            if pattern:
                tests = [t for t in tests
                         if re.search(pattern, '%s.%s' % (class_name,
                                                          t._testMethodName))]

            suite.addTests(tests)

    return suite