#!/usr/bin/env python

from __future__ import print_function
import optparse
import os
import sys
import subprocess

try:
    import django
    from django.conf import settings
    from django.test.utils import get_runner
    # We don't actually need typing, but it's a good guard for being
    # outside a Zulip virtualenv.
    import typing
except ImportError as e:
    print("ImportError: {}".format(e))
    print("You need to run the Zulip tests inside a Zulip dev environment.")
    print("If you are using Vagrant, you can `vagrant ssh` to enter the Vagrant guest.")
    sys.exit(1)

if __name__ == "__main__":
    TOOLS_DIR = os.path.dirname(os.path.abspath(__file__))
    os.chdir(os.path.dirname(TOOLS_DIR))
    sys.path.insert(0, os.path.dirname(TOOLS_DIR))
    os.environ['DJANGO_SETTINGS_MODULE'] = 'zproject.test_settings'
    # "-u" uses unbuffered IO, which is important when wrapping it in subprocess
    os.environ['PYTHONUNBUFFERED'] = 'y'

    usage = """%prog [options]
    test-backend # Runs all backend tests
    test-backend zerver.tests.test_bugdown # run all tests in a test module
    test-backend zerver.tests.test_bugdown.BugdownTest # run all tests in a test class
    test-backend zerver.tests.test_bugdown.BugdownTest.test_inline_youtube # run a single test"""

    parser = optparse.OptionParser(usage)
    parser.add_option('--nonfatal-errors', action="store_false", default=True,
                      dest="fatal_errors", help="Continue past test failures to run all tests")
    parser.add_option('--coverage', dest='coverage',
                      action="store_true",
                      default=False, help='Compute test coverage.')
    parser.add_option('--no-verbose-coverage', dest='verbose_coverage',
                      action="store_false",
                      default=True, help='Disable verbose print of coverage report.')
    parser.add_option('--profile', dest='profile',
                      action="store_true",
                      default=False, help='Profile test runtime.')
    parser.add_option('--no-shallow', dest='no_shallow',
                      action="store_true",
                      default=False,
                      help="Don't allow shallow testing of templates")
    parser.add_option('--verbose', dest='verbose',
                      action="store_true",
                      default=False,
                      help="Show detailed output")
    parser.add_option('--no-generate-fixtures', action="store_false", default=True,
                      dest="generate_fixtures",
                      help=("Reduce running time by not calling generate-fixtures. "
                            "This may cause spurious failures for some tests."))
    parser.add_option('--report-slow-tests', dest='report_slow_tests',
                      action="store_true",
                      default=False,
                      help="Show which tests are slowest.")

    (options, args) = parser.parse_args()
    if len(args) == 0:
        suites = ["zerver.tests"]
    else:
        suites = args

    if options.coverage:
        import coverage
        cov = coverage.Coverage(omit="*/zulip-venv-cache/*")
        cov.start()
    if options.profile:
        import cProfile
        prof = cProfile.Profile()
        prof.enable()

    # setup() needs to be called after coverage is started to get proper coverage reports of model
    # files, since part of setup is importing the models for all applications in INSTALLED_APPS.
    django.setup()

    if options.generate_fixtures:
        subprocess.call(os.path.join(TOOLS_DIR, 'setup', 'generate-fixtures'))

    TestRunner = get_runner(settings)
    test_runner = TestRunner()
    failures = test_runner.run_tests(suites, fatal_errors=options.fatal_errors)

    templates_not_rendered = test_runner.get_shallow_tested_templates()
    if templates_not_rendered:
        missed_count = len(templates_not_rendered)
        if options.no_shallow or options.verbose:
            print("*** Shallow tested templates: {}".format(missed_count))

        if options.verbose:
            for template in templates_not_rendered:
                print('--- {}'.format(template))

        if options.no_shallow:
            failures = True

    if options.coverage:
        cov.stop()
        cov.save()
        if options.verbose_coverage:
            print("Printing coverage data")
            cov.report(show_missing=False)
        cov.html_report(directory='var/coverage')
        print("HTML report saved to var/coverage")
    if options.profile:
        prof.disable()
        prof.dump_stats("/tmp/profile.data")
        print("Profile data saved to /tmp/profile.data")
        print("You can visualize it using e.g. `runsnake /tmp/profile.data`")

    if options.report_slow_tests:
        from zerver.lib.test_runner import report_slow_tests
        # We do this even with failures, since slowness can be
        # an important clue as to why tests fail.
        report_slow_tests()

    if failures:
        print('FAILED!')
    else:
        print('DONE!')
    sys.exit(bool(failures))