#
# Python unit test runner
#
# Author : Sander Mathijs van Veen <smvv@kompiler.org>
# License: GPL version 3, see also the file `LICENSE'.
#
import os
import sys
import time
import unittest


class TextTestRunner(unittest.TextTestRunner):
    """This is a wrapper class used to minimize the amount of blank lines
    printed to stdout. The method ``run`` is modified and it's original source
    is in Python Standard Library's ``unittest`` module."""

    def __init__(self, stream=sys.stderr, descriptions=True, verbosity=1,
            color=True):
        unittest.TextTestRunner.__init__(self, stream, descriptions, verbosity)
        self.color = color

    def run(self, test):
        "Run the given test case or test suite."
        result = self._makeResult()
        result.failfast = getattr(self, 'failfast', None)
        result.buffer = getattr(self, 'buffer', None)
        startTime = time.time()
        startTestRun = getattr(result, 'startTestRun', None)

        if startTestRun is not None:
            startTestRun()

        try:
            test(result)
        finally:
            stopTestRun = getattr(result, 'stopTestRun', None)
            if stopTestRun is not None:
                stopTestRun()

        stopTime = time.time()
        timeTaken = stopTime - startTime
        result.printErrors()

        if not result.wasSuccessful():
            if self.color:
                msg = '\033[0;31mFAIL\033[1;m'
            else:
                msg = 'FAIL'
            self.stream.write(msg)
        else:
            if self.color:
                msg = '\033[0;32mOK\033[0;m'
            else:
                msg = 'OK'

            self.stream.write(msg)

        self.stream.write(' %s: %d test%s in %.3fs ' \
                          % (test.filename, result.testsRun,
                             result.testsRun != 1 and 's' or '', timeTaken))

        expectedFails = unexpectedSuccesses = skipped = 0

        try:
            results = map(len, (result.expectedFailures,
                                result.unexpectedSuccesses,
                                result.skipped))
        except AttributeError:
            pass
        else:
            expectedFails, unexpectedSuccesses, skipped = results

        infos = []

        if not result.wasSuccessful():
            failed, errored = map(len, (result.failures, result.errors))

            if failed:
                if self.color:
                    msg = 'failures=\033[1;31m%d\033[1;m'
                else:
                    msg = 'failures=%d'
                infos.append(msg % failed)

            if errored:
                if self.color:
                    msg = 'errors=\033[1;31m%d\033[1;m'
                else:
                    msg = 'errors=%d'
                infos.append(msg % errored)

        if skipped:
            if self.color:
                msg = 'skipped=\033[1;33m%d\033[1;m'
            else:
                msg = 'skipped=%d'

            infos.append(msg % skipped)

        if expectedFails:
            infos.append('expected failures=%d' % expectedFails)

        if unexpectedSuccesses:
            infos.append('unexpected successes=%d' % unexpectedSuccesses)

        if infos:
            self.stream.writeln(' (%s)' % (', '.join(infos),))
        else:
            self.stream.write('\n')

        return result


def main(tests, verbose=0, color=True):
    testcases = []

    # Dynamic load the requested module containing the test cases.
    for testfile in tests:

        try:
            module_name = os.path.splitext(testfile)[0].replace('/', '.')
            module_obj = __import__(module_name)
        except:
            print 'testfile:   ', testfile
            print 'module_name:', module_name
            raise

        # Start the test runner and display the results to stdout.
        try:
            suite_name = module_name.split('.')[-1]
            container = module_obj.__dict__[suite_name]
        except:
            print 'testfile:   ', testfile
            print 'module_name:', module_name
            print 'module_obj: ', module_obj, dir(module_obj)
            raise

        # Convert lowercase, underscored suite name to Python class name.
        class_parts = suite_name[5:].split('_')
        class_name = 'Test' + ''.join([p.capitalize() for p in class_parts])

        testcase = container.__dict__[class_name]
        testcases += [unittest.TestLoader().loadTestsFromTestCase(testcase)]

    # Create the text runner and execute the tests.
    runner = TextTestRunner(verbosity=verbose, color=color)
    suite = unittest.TestSuite(testcases)
    suite.filename = testfile if tests else None

    result = runner.run(suite)

    # Return non zero exit code if there are failures or errors occured.
    if result.failures or result.errors:
        sys.exit(1)