"""
Tests for django test runner
"""
from __future__ import absolute_import, unicode_literals

import sys
from optparse import make_option

from django.core.exceptions import ImproperlyConfigured
from django.core.management import call_command
from django import db
from django.test import simple, TransactionTestCase, skipUnlessDBFeature
from django.test.simple import DjangoTestSuiteRunner, get_tests
from django.test.testcases import connections_support_transactions
from django.utils import unittest
from django.utils.importlib import import_module

from admin_scripts.tests import AdminScriptTestCase
from .models import Person


TEST_APP_OK = 'test_runner.valid_app.models'
TEST_APP_ERROR = 'test_runner.invalid_app.models'


class DependencyOrderingTests(unittest.TestCase):

    def test_simple_dependencies(self):
        raw = [
            ('s1', ('s1_db', ['alpha'])),
            ('s2', ('s2_db', ['bravo'])),
            ('s3', ('s3_db', ['charlie'])),
        ]
        dependencies = {
            'alpha': ['charlie'],
            'bravo': ['charlie'],
        }

        ordered = simple.dependency_ordered(raw, dependencies=dependencies)
        ordered_sigs = [sig for sig,value in ordered]

        self.assertIn('s1', ordered_sigs)
        self.assertIn('s2', ordered_sigs)
        self.assertIn('s3', ordered_sigs)
        self.assertLess(ordered_sigs.index('s3'), ordered_sigs.index('s1'))
        self.assertLess(ordered_sigs.index('s3'), ordered_sigs.index('s2'))

    def test_chained_dependencies(self):
        raw = [
            ('s1', ('s1_db', ['alpha'])),
            ('s2', ('s2_db', ['bravo'])),
            ('s3', ('s3_db', ['charlie'])),
        ]
        dependencies = {
            'alpha': ['bravo'],
            'bravo': ['charlie'],
        }

        ordered = simple.dependency_ordered(raw, dependencies=dependencies)
        ordered_sigs = [sig for sig,value in ordered]

        self.assertIn('s1', ordered_sigs)
        self.assertIn('s2', ordered_sigs)
        self.assertIn('s3', ordered_sigs)

        # Explicit dependencies
        self.assertLess(ordered_sigs.index('s2'), ordered_sigs.index('s1'))
        self.assertLess(ordered_sigs.index('s3'), ordered_sigs.index('s2'))

        # Implied dependencies
        self.assertLess(ordered_sigs.index('s3'), ordered_sigs.index('s1'))

    def test_multiple_dependencies(self):
        raw = [
            ('s1', ('s1_db', ['alpha'])),
            ('s2', ('s2_db', ['bravo'])),
            ('s3', ('s3_db', ['charlie'])),
            ('s4', ('s4_db', ['delta'])),
        ]
        dependencies = {
            'alpha': ['bravo','delta'],
            'bravo': ['charlie'],
            'delta': ['charlie'],
        }

        ordered = simple.dependency_ordered(raw, dependencies=dependencies)
        ordered_sigs = [sig for sig,aliases in ordered]

        self.assertIn('s1', ordered_sigs)
        self.assertIn('s2', ordered_sigs)
        self.assertIn('s3', ordered_sigs)
        self.assertIn('s4', ordered_sigs)

        # Explicit dependencies
        self.assertLess(ordered_sigs.index('s2'), ordered_sigs.index('s1'))
        self.assertLess(ordered_sigs.index('s4'), ordered_sigs.index('s1'))
        self.assertLess(ordered_sigs.index('s3'), ordered_sigs.index('s2'))
        self.assertLess(ordered_sigs.index('s3'), ordered_sigs.index('s4'))

        # Implicit dependencies
        self.assertLess(ordered_sigs.index('s3'), ordered_sigs.index('s1'))

    def test_circular_dependencies(self):
        raw = [
            ('s1', ('s1_db', ['alpha'])),
            ('s2', ('s2_db', ['bravo'])),
        ]
        dependencies = {
            'bravo': ['alpha'],
            'alpha': ['bravo'],
        }

        self.assertRaises(ImproperlyConfigured, simple.dependency_ordered, raw, dependencies=dependencies)