"""
Unit tests for enrollment methods in views.py

"""

from django.test.utils import override_settings
from django.contrib.auth.models import User
from django.core.urlresolvers import reverse
from courseware.tests.helpers import LoginEnrollmentTestCase
from courseware.tests.modulestore_config import TEST_DATA_MIXED_MODULESTORE
from xmodule.modulestore.tests.factories import CourseFactory
from student.tests.factories import UserFactory, CourseEnrollmentFactory, AdminFactory
from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
from student.models import CourseEnrollment, CourseEnrollmentAllowed
from instructor.views.legacy import get_and_clean_student_list, send_mail_to_student
from django.core import mail

USER_COUNT = 4


@override_settings(MODULESTORE=TEST_DATA_MIXED_MODULESTORE)
class TestInstructorEnrollsStudent(ModuleStoreTestCase, LoginEnrollmentTestCase):
    """
    Check Enrollment/Unenrollment with/without auto-enrollment on activation and with/without email notification
    """

    def setUp(self):

        instructor = AdminFactory.create()
        self.client.login(username=instructor.username, password='test')

        self.course = CourseFactory.create()

        self.users = [
            UserFactory.create(username="student%d" % i, email="student%d@test.com" % i)
            for i in xrange(USER_COUNT)
        ]

        for user in self.users:
            CourseEnrollmentFactory.create(user=user, course_id=self.course.id)

        # Empty the test outbox
        mail.outbox = []

    def test_unenrollment_email_off(self):
        """
        Do un-enrollment email off test
        """

        course = self.course

        # Run the Un-enroll students command
        url = reverse('instructor_dashboard', kwargs={'course_id': course.id})
        response = self.client.post(
            url,
            {
                'action': 'Unenroll multiple students',
                'multiple_students': 'student0@test.com student1@test.com'
            }
        )

        # Check the page output
        self.assertContains(response, '<td>student0@test.com</td>')
        self.assertContains(response, '<td>student1@test.com</td>')
        self.assertContains(response, '<td>un-enrolled</td>')

        # Check the enrollment table
        user = User.objects.get(email='student0@test.com')
        self.assertFalse(CourseEnrollment.is_enrolled(user, course.id))

        user = User.objects.get(email='student1@test.com')
        self.assertFalse(CourseEnrollment.is_enrolled(user, course.id))

        # Check the outbox
        self.assertEqual(len(mail.outbox), 0)

    def test_enrollment_new_student_autoenroll_on_email_off(self):
        """
        Do auto-enroll on, email off test
        """

        course = self.course

        # Run the Enroll students command
        url = reverse('instructor_dashboard', kwargs={'course_id': course.id})
        response = self.client.post(url, {'action': 'Enroll multiple students', 'multiple_students': 'student1_1@test.com, student1_2@test.com', 'auto_enroll': 'on'})

        # Check the page output
        self.assertContains(response, '<td>student1_1@test.com</td>')
        self.assertContains(response, '<td>student1_2@test.com</td>')
        self.assertContains(response, '<td>user does not exist, enrollment allowed, pending with auto enrollment on</td>')

        # Check the outbox
        self.assertEqual(len(mail.outbox), 0)

        # Check the enrollmentallowed db entries
        cea = CourseEnrollmentAllowed.objects.filter(email='student1_1@test.com', course_id=course.id)
        self.assertEqual(1, cea[0].auto_enroll)
        cea = CourseEnrollmentAllowed.objects.filter(email='student1_2@test.com', course_id=course.id)
        self.assertEqual(1, cea[0].auto_enroll)

        # Check there is no enrollment db entry other than for the other students
        ce = CourseEnrollment.objects.filter(course_id=course.id, is_active=1)
        self.assertEqual(4, len(ce))

        # Create and activate student accounts with same email
        self.student1 = 'student1_1@test.com'
        self.password = 'bar'
        self.create_account('s1_1', self.student1, self.password)
        self.activate_user(self.student1)

        self.student2 = 'student1_2@test.com'
        self.create_account('s1_2', self.student2, self.password)
        self.activate_user(self.student2)

        # Check students are enrolled
        user = User.objects.get(email='student1_1@test.com')
        self.assertTrue(CourseEnrollment.is_enrolled(user, course.id))

        user = User.objects.get(email='student1_2@test.com')
        self.assertTrue(CourseEnrollment.is_enrolled(user, course.id))

    def test_repeat_enroll(self):
        """
        Try to enroll an already enrolled student
        """

        course = self.course

        url = reverse('instructor_dashboard', kwargs={'course_id': course.id})
        response = self.client.post(url, {'action': 'Enroll multiple students', 'multiple_students': 'student0@test.com', 'auto_enroll': 'on'})
        self.assertContains(response, '<td>student0@test.com</td>')
        self.assertContains(response, '<td>already enrolled</td>')

    def test_enrollmemt_new_student_autoenroll_off_email_off(self):
        """
        Do auto-enroll off, email off test
        """

        course = self.course

        # Run the Enroll students command
        url = reverse('instructor_dashboard', kwargs={'course_id': course.id})
        response = self.client.post(url, {'action': 'Enroll multiple students', 'multiple_students': 'student2_1@test.com, student2_2@test.com'})

        # Check the page output
        self.assertContains(response, '<td>student2_1@test.com</td>')
        self.assertContains(response, '<td>student2_2@test.com</td>')
        self.assertContains(response, '<td>user does not exist, enrollment allowed, pending with auto enrollment off</td>')

        # Check the outbox
        self.assertEqual(len(mail.outbox), 0)

        # Check the enrollmentallowed db entries
        cea = CourseEnrollmentAllowed.objects.filter(email='student2_1@test.com', course_id=course.id)
        self.assertEqual(0, cea[0].auto_enroll)
        cea = CourseEnrollmentAllowed.objects.filter(email='student2_2@test.com', course_id=course.id)
        self.assertEqual(0, cea[0].auto_enroll)

        # Check there is no enrollment db entry other than for the setup instructor and students
        ce = CourseEnrollment.objects.filter(course_id=course.id, is_active=1)
        self.assertEqual(4, len(ce))

        # Create and activate student accounts with same email
        self.student = 'student2_1@test.com'
        self.password = 'bar'
        self.create_account('s2_1', self.student, self.password)
        self.activate_user(self.student)

        self.student = 'student2_2@test.com'
        self.create_account('s2_2', self.student, self.password)
        self.activate_user(self.student)

        # Check students are not enrolled
        user = User.objects.get(email='student2_1@test.com')
        self.assertFalse(CourseEnrollment.is_enrolled(user, course.id))

        user = User.objects.get(email='student2_2@test.com')
        self.assertFalse(CourseEnrollment.is_enrolled(user, course.id))

    def test_get_and_clean_student_list(self):
        """
        Clean user input test
        """

        string = "abc@test.com, def@test.com ghi@test.com \n \n jkl@test.com   \n mno@test.com   "
        cleaned_string, cleaned_string_lc = get_and_clean_student_list(string)
        self.assertEqual(cleaned_string, ['abc@test.com', 'def@test.com', 'ghi@test.com', 'jkl@test.com', 'mno@test.com'])

    def test_enrollment_email_on(self):
        """
        Do email on enroll test
        """

        course = self.course

        # Create activated, but not enrolled, user
        UserFactory.create(username="student3_0", email="student3_0@test.com")

        url = reverse('instructor_dashboard', kwargs={'course_id': course.id})
        response = self.client.post(url, {'action': 'Enroll multiple students', 'multiple_students': 'student3_0@test.com, student3_1@test.com, student3_2@test.com', 'auto_enroll': 'on', 'email_students': 'on'})

        # Check the page output
        self.assertContains(response, '<td>student3_0@test.com</td>')
        self.assertContains(response, '<td>student3_1@test.com</td>')
        self.assertContains(response, '<td>student3_2@test.com</td>')
        self.assertContains(response, '<td>added, email sent</td>')
        self.assertContains(response, '<td>user does not exist, enrollment allowed, pending with auto enrollment on, email sent</td>')

        # Check the outbox
        self.assertEqual(len(mail.outbox), 3)
        self.assertEqual(
            mail.outbox[0].subject,
            'You have been enrolled in Robot Super Course'
        )
        self.assertEqual(
            mail.outbox[0].body,
            "Dear Robot Test\n\nYou have been enrolled in Robot Super Course "
            "at edx.org by a member of the course staff. "
            "The course should now appear on your edx.org dashboard.\n\n"
            "To start accessing course materials, please visit "
            "https://edx.org/courses/MITx/999/Robot_Super_Course\n\n"
            "----\nThis email was automatically sent from edx.org to Robot Test"
        )

        self.assertEqual(
            mail.outbox[1].subject,
            'You have been invited to register for Robot Super Course'
        )
        self.assertEqual(
            mail.outbox[1].body,
            "Dear student,\n\nYou have been invited to join "
            "Robot Super Course at edx.org by a member of the "
            "course staff.\n\n"
            "To finish your registration, please visit "
            "https://edx.org/register and fill out the registration form "
            "making sure to use student3_1@test.com in the E-mail field.\n"
            "Once you have registered and activated your account, you will "
            "see Robot Super Course listed on your dashboard.\n\n"
            "----\nThis email was automatically sent from edx.org to "
            "student3_1@test.com"
        )

    def test_unenrollment_email_on(self):
        """
        Do email on unenroll test
        """

        course = self.course

        # Create invited, but not registered, user
        cea = CourseEnrollmentAllowed(email='student4_0@test.com', course_id=course.id)
        cea.save()

        url = reverse('instructor_dashboard', kwargs={'course_id': course.id})
        response = self.client.post(url, {'action': 'Unenroll multiple students', 'multiple_students': 'student4_0@test.com, student2@test.com, student3@test.com', 'email_students': 'on'})

        # Check the page output
        self.assertContains(response, '<td>student2@test.com</td>')
        self.assertContains(response, '<td>student3@test.com</td>')
        self.assertContains(response, '<td>un-enrolled, email sent</td>')

        # Check the outbox
        self.assertEqual(len(mail.outbox), 3)
        self.assertEqual(
            mail.outbox[0].subject,
            'You have been un-enrolled from Robot Super Course'
        )
        self.assertEqual(
            mail.outbox[0].body,
            "Dear Student,\n\nYou have been un-enrolled from course "
            "Robot Super Course by a member of the course staff. "
            "Please disregard the invitation previously sent.\n\n"
            "----\nThis email was automatically sent from edx.org "
            "to student4_0@test.com"
        )
        self.assertEqual(
            mail.outbox[1].subject,
            'You have been un-enrolled from Robot Super Course'
        )


    def test_send_mail_to_student(self):
        """
        Do invalid mail template test
        """

        d = {'message': 'message_type_that_doesn\'t_exist'}

        send_mail_ret = send_mail_to_student('student0@test.com', d)
        self.assertFalse(send_mail_ret)
