from typing import List

from django.contrib.auth import get_user_model
from django.test import TestCase

from writingtogether.models import StoryRound, Story, StoryPart

User = get_user_model()

class TestModelFunctions(TestCase):

    def create_users_and_story_round_with_stories_and_parts(self):
        self.user1 = User.objects.create(username='player1')
        self.user2 = User.objects.create(username='player2')

        self.story_round = StoryRound.objects.create(
            name='test_round',
            number_of_rounds=4
        )
        self.story_round.participants.add(self.user1)
        self.story_round.participants.add(self.user2)

        self.story1 = Story.objects.create(
            name='story1',
            part_of_round=self.story_round,
            started_by=self.user1,
        )

        self.story2 = Story.objects.create(
            name='story2',
            part_of_round=self.story_round,
            started_by=self.user2,
        )

        self.parts1 = self.create_story_parts(self.story1, users=[self.user1, self.user2], num_rounds=4)
        self.parts2 = self.create_story_parts(self.story2, users=[self.user1, self.user2], num_rounds=4,
                                              first_user_index=1)

    def create_story_parts(
            self, story: Story, users: List[User],
            num_rounds: int, first_user_index: int = 0
    ) -> List[StoryPart]:
        parts = []
        previous_part = None
        for i in range(num_rounds):
            user = users[(first_user_index + i) % len(users)]
            new_part = StoryPart.objects.create(
                user=user,
                previous_part=previous_part,
                part_of=story
            )
            parts.append(new_part)
            previous_part = new_part

        return parts

    def test_get_first_unfinished_part__nothing_written(self):
        self.create_users_and_story_round_with_stories_and_parts()

        result = self.story1.get_first_unfinished_part()

        self.assertEqual(result, self.parts1[0])

    def test_get_first_unfinished_part__one_written(self):
        self.create_users_and_story_round_with_stories_and_parts()
        self.parts1[0].text = 'some text'
        self.parts1[0].save()

        result = self.story1.get_first_unfinished_part()

        self.assertEqual(result, self.parts1[1])

    def test_get_first_unfinished_part__finished(self):
        self.create_users_and_story_round_with_stories_and_parts()
        self.parts1[0].text = 'some text'
        self.parts1[0].save()
        self.parts1[1].text = 'some text'
        self.parts1[1].save()
        self.parts1[2].text = 'some text'
        self.parts1[2].save()
        self.parts1[3].text = 'some text'
        self.parts1[3].save()
        self.story1.finished = True
        self.story1.save()

        result = self.story1.get_first_unfinished_part()

        self.assertEqual(result, None)