"""
Test models, managers, and validators.
"""

from __future__ import absolute_import, division, print_function, unicode_literals

from django.core.exceptions import ValidationError
from django.test import TestCase
from opaque_keys.edx.keys import UsageKey

from student.tests.factories import UserFactory

from .. import models
from .. import waffle


class PercentValidatorTestCase(TestCase):
    """
    Test that validate_percent only allows floats (and ints) between 0.0 and 1.0.
    """
    def test_valid_percents(self):
        for value in [1.0, 0.0, 1, 0, 0.5, 0.333081348071397813987230871]:
            models.validate_percent(value)

    def test_invalid_percent(self):
        for value in [-0.00000000001, 1.0000000001, 47.1, 1000, None, float('inf'), float('nan')]:
            self.assertRaises(ValidationError, models.validate_percent, value)


class CompletionSetUpMixin(object):
    def set_up_completion(self):
        self.user = UserFactory()
        self.block_key = UsageKey.from_string(u'block-v1:edx+test+run+type@video+block@doggos')
        self.completion = models.BlockCompletion.objects.create(
            user=self.user,
            course_key=self.block_key.course_key,
            block_type=self.block_key.block_type,
            block_key=self.block_key,
            completion=0.5,
        )


class SubmitCompletionTestCase(CompletionSetUpMixin, TestCase):
    """
    Test that BlockCompletion.objects.submit_completion has the desired
    semantics.
    """
    def setUp(self):
        super(SubmitCompletionTestCase, self).setUp()
        _overrider = waffle.waffle().override(waffle.ENABLE_COMPLETION_TRACKING, True)
        _overrider.__enter__()
        self.addCleanup(_overrider.__exit__, None, None, None)
        self.set_up_completion()

    def test_changed_value(self):
        with self.assertNumQueries(4):  # Get, update, 2 * savepoints
            completion, isnew = models.BlockCompletion.objects.submit_completion(
                user=self.user,
                course_key=self.block_key.course_key,
                block_key=self.block_key,
                completion=0.9,
            )
        completion.refresh_from_db()
        self.assertEqual(completion.completion, 0.9)
        self.assertFalse(isnew)
        self.assertEqual(models.BlockCompletion.objects.count(), 1)

    def test_unchanged_value(self):
        with self.assertNumQueries(1):  # Get
            completion, isnew = models.BlockCompletion.objects.submit_completion(
                user=self.user,
                course_key=self.block_key.course_key,
                block_key=self.block_key,
                completion=0.5,
            )
        completion.refresh_from_db()
        self.assertEqual(completion.completion, 0.5)
        self.assertFalse(isnew)
        self.assertEqual(models.BlockCompletion.objects.count(), 1)

    def test_new_user(self):
        newuser = UserFactory()
        with self.assertNumQueries(4):  # Get, update, 2 * savepoints
            _, isnew = models.BlockCompletion.objects.submit_completion(
                user=newuser,
                course_key=self.block_key.course_key,
                block_key=self.block_key,
                completion=0.0,
            )
        self.assertTrue(isnew)
        self.assertEqual(models.BlockCompletion.objects.count(), 2)

    def test_new_block(self):
        newblock = UsageKey.from_string(u'block-v1:edx+test+run+type@video+block@puppers')
        with self.assertNumQueries(4):  # Get, update, 2 * savepoints
            _, isnew = models.BlockCompletion.objects.submit_completion(
                user=self.user,
                course_key=newblock.course_key,
                block_key=newblock,
                completion=1.0,
            )
        self.assertTrue(isnew)
        self.assertEqual(models.BlockCompletion.objects.count(), 2)

    def test_invalid_completion(self):
        with self.assertRaises(ValidationError):
            models.BlockCompletion.objects.submit_completion(
                user=self.user,
                course_key=self.block_key.course_key,
                block_key=self.block_key,
                completion=1.2
            )
        completion = models.BlockCompletion.objects.get(user=self.user, block_key=self.block_key)
        self.assertEqual(completion.completion, 0.5)
        self.assertEqual(models.BlockCompletion.objects.count(), 1)


class CompletionDisabledTestCase(CompletionSetUpMixin, TestCase):

    @classmethod
    def setUpClass(cls):
        super(CompletionDisabledTestCase, cls).setUpClass()
        cls.overrider = waffle.waffle().override(waffle.ENABLE_COMPLETION_TRACKING, False)
        cls.overrider.__enter__()

    @classmethod
    def tearDownClass(cls):
        cls.overrider.__exit__(None, None, None)
        super(CompletionDisabledTestCase, cls).tearDownClass()

    def setUp(self):
        super(CompletionDisabledTestCase, self).setUp()
        self.set_up_completion()

    def test_cannot_call_submit_completion(self):
        self.assertEqual(models.BlockCompletion.objects.count(), 1)
        with self.assertRaises(RuntimeError):
            models.BlockCompletion.objects.submit_completion(
                user=self.user,
                course_key=self.block_key.course_key,
                block_key=self.block_key,
                completion=0.9,
            )
        self.assertEqual(models.BlockCompletion.objects.count(), 1)
