#!/usr/bin/env python

"""
run tests for pyloader
"""

# imports
import argparse
import doctest
import os
import sys

directory = os.path.dirname(os.path.abspath(__file__))

def gather():
    """ gather tests"""
    return [test for test in os.listdir(directory)
            if test.endswith('.txt')]

def run_tests(tests=None, raise_on_error=False, report_first=False):
    """run the tests"""

    # add results here
    results = {}

    # doctest arguments
    extraglobs = {'here': directory}
    doctest_args = dict(extraglobs=extraglobs, raise_on_error=raise_on_error)
    if report_first:
        doctest_args['optionflags'] = doctest.REPORT_ONLY_FIRST_FAILURE

    # gather tests
    tests = tests or gather()

    # run the tests
    for test in tests:
        print ("Running: " + test)
        try:
            results[test] = doctest.testfile(test, **doctest_args)
        except doctest.DocTestFailure, failure:
            raise
        except doctest.UnexpectedException, failure:
            raise failure.exc_info[0], failure.exc_info[1], failure.exc_info[2]

    return results

def main(args=sys.argv[1:]):
    """test runner CLI"""

    # parse command line args
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument('tests', metavar='test', nargs="*",
                        help="tests to run; if omitted, run all")
    parser.add_argument('--list', dest='list_tests',
                        action='store_true', default=False,
                        help="list tests and exit")
    parser.add_argument('--raise', dest='raise_on_error',
                        default=False, action='store_true',
                        help="raise on first error")
    parser.add_argument('--report-first', dest='report_first',
                        default=False, action='store_true',
                        help="report the first error only (all tests will still run)")
    options = parser.parse_args(args)

    # gather tests
    tests = gather()

    # filter tests
    if options.tests:
        missing = set(options.tests).difference(tests)
        if missing:
            parser.error("Test files not found: {0}; Should be in {1}".format(', '.join(missing),
                                                                              ', '.join(tests)))
        tests = options.tests

    if options.list_tests:
        print ("\n".join(tests))
        sys.exit()

    # run the tests
    results = run_tests(tests=tests,
                        report_first=options.report_first,
                        raise_on_error=options.raise_on_error)
    if sum([i.failed for i in results.values()]):
        sys.exit(1) # error


if __name__ == '__main__':
    main()