from django.core.files.uploadedfile import SimpleUploadedFile
from django.core.files.uploadedfile import SimpleUploadedFile
from django.urls import reverse
from rest_framework import status
from rest_framework.test import APITestCase

from apps.account.models import ProfessorUser, StudentUser
from apps.course.models.course import Course, CourseCategory
from apps.course.models.lesson import CourseChapter, CourseLesson, Lesson, LessonCompletion
from apps.course.models.participant import Participant


class MyCoursesAPITests(APITestCase):
    def setUp(self):
        self.professor = ProfessorUser.objects.create(
            email='prof@example.com',
            fullname='Professor Example',
            experience_years=5,
        )
        self.student = StudentUser.objects.create(
            email='student@example.com',
            fullname='Student Example',
        )
        self.category = CourseCategory.objects.create(
            name='Category',
            slug='category',
        )

    def _create_course(self, slug, title):
        thumbnail = SimpleUploadedFile('thumb.jpg', b'filecontent', content_type='image/jpeg')
        return Course.objects.create(
            title=title,
            slug=slug,
            category=self.category,
            professor=self.professor,
            thumbnail=thumbnail,
            video_type=Course.VedioTypeChoices.YOUTUBE_LINK,
            video_link='https://example.com/video',
            is_online=False,
            level=Course.LevelChoices.BEGINNER,
            duration=10,
            lessons_count=0,
            description='Description',
            short_description='Short description',
            status=Course.StatusChoices.ONGOING,
            is_free=True,
        )

    def _attach_lessons(self, course, lesson_specs):
        chapter = CourseChapter.objects.create(
            course=course,
            title=f'{course.title} Chapter',
            priority=1,
            is_active=True,
        )

        created_lessons = []
        for index, spec in enumerate(lesson_specs, start=1):
            lesson = Lesson.objects.create(
                title=spec['title'],
                content_type=Lesson.ContentTypeChoices.VIDEO_FILE,
                duration=5,
            )
            course_lesson = CourseLesson.objects.create(
                course=course,
                chapter=chapter,
                lesson=lesson,
                priority=index,
                is_active=spec.get('is_active', True),
            )
            created_lessons.append(course_lesson)

        return created_lessons

    def test_completed_filter_returns_only_courses_with_all_active_lessons_completed(self):
        completed_course = self._create_course('completed-course', 'Completed Course')
        partial_course = self._create_course('partial-course', 'Partial Course')
        empty_course = self._create_course('empty-course', 'Empty Course')

        completed_lessons = self._attach_lessons(
            completed_course,
            [
                {'title': 'Completed Lesson 1'},
                {'title': 'Completed Lesson 2'},
                {'title': 'Inactive Lesson', 'is_active': False},
            ],
        )
        partial_lessons = self._attach_lessons(
            partial_course,
            [
                {'title': 'Partial Lesson 1'},
                {'title': 'Partial Lesson 2'},
            ],
        )

        Participant.objects.create(student=self.student, course=completed_course)
        Participant.objects.create(student=self.student, course=partial_course)
        Participant.objects.create(student=self.student, course=empty_course)

        LessonCompletion.objects.create(student=self.student, course_lesson=completed_lessons[0])
        LessonCompletion.objects.create(student=self.student, course_lesson=completed_lessons[1])
        LessonCompletion.objects.create(student=self.student, course_lesson=partial_lessons[0])

        self.client.force_authenticate(user=self.student)
        url = reverse('course-my-courses-list')
        response = self.client.get(url, {'completed': 'true'}, format='json')

        self.assertEqual(response.status_code, status.HTTP_200_OK)
        self.assertEqual(response.data['count'], 1)
        self.assertEqual({item['slug'] for item in response.data['results']}, {completed_course.slug})

    def test_my_courses_without_completed_filter_returns_completed_and_incomplete_courses(self):
        completed_course = self._create_course('all-completed-course', 'All Completed Course')
        partial_course = self._create_course('all-partial-course', 'All Partial Course')

        completed_lessons = self._attach_lessons(
            completed_course,
            [
                {'title': 'Completed Lesson 1'},
            ],
        )
        partial_lessons = self._attach_lessons(
            partial_course,
            [
                {'title': 'Partial Lesson 1'},
                {'title': 'Partial Lesson 2'},
            ],
        )

        Participant.objects.create(student=self.student, course=completed_course)
        Participant.objects.create(student=self.student, course=partial_course)

        LessonCompletion.objects.create(student=self.student, course_lesson=completed_lessons[0])
        LessonCompletion.objects.create(student=self.student, course_lesson=partial_lessons[0])

        self.client.force_authenticate(user=self.student)
        url = reverse('course-my-courses-list')
        response = self.client.get(url, format='json')

        self.assertEqual(response.status_code, status.HTTP_200_OK)
        self.assertEqual(response.data['count'], 2)
        self.assertEqual(
            {item['slug'] for item in response.data['results']},
            {completed_course.slug, partial_course.slug},
        )