from typing import List, Optional

import databases
import sqlalchemy
from sqlalchemy import create_engine

import ormar
import pytest

from tests.settings import DATABASE_URL

db = databases.Database(DATABASE_URL, force_rollback=True)
metadata = sqlalchemy.MetaData()


class Keyword(ormar.Model):
    class Meta:
        metadata = metadata
        database = db
        tablename = "keywords"

    id: int = ormar.Integer(primary_key=True)
    name: str = ormar.String(max_length=50)


class KeywordPrimaryModel(ormar.Model):
    class Meta:
        metadata = metadata
        database = db
        tablename = "primary_models_keywords"

    id: int = ormar.Integer(primary_key=True)


class PrimaryModel(ormar.Model):
    class Meta:
        metadata = metadata
        database = db
        tablename = "primary_models"

    id: int = ormar.Integer(primary_key=True)
    name: str = ormar.String(max_length=255, index=True)
    some_text: str = ormar.Text()
    some_other_text: Optional[str] = ormar.Text(nullable=True)
    keywords: Optional[List[Keyword]] = ormar.ManyToMany(
        Keyword, through=KeywordPrimaryModel
    )


class SecondaryModel(ormar.Model):
    class Meta:
        metadata = metadata
        database = db
        tablename = "secondary_models"

    id: int = ormar.Integer(primary_key=True)
    name: str = ormar.String(max_length=100)
    primary_model: PrimaryModel = ormar.ForeignKey(
        PrimaryModel, related_name="secondary_models",
    )


@pytest.mark.asyncio
async def test_create_primary_models():
    async with db:
        for name, some_text, some_other_text in [
            ("Primary 1", "Some text 1", "Some other text 1"),
            ("Primary 2", "Some text 2", "Some other text 2"),
            ("Primary 3", "Some text 3", "Some other text 3"),
            ("Primary 4", "Some text 4", "Some other text 4"),
            ("Primary 5", "Some text 5", "Some other text 5"),
            ("Primary 6", "Some text 6", "Some other text 6"),
            ("Primary 7", "Some text 7", "Some other text 7"),
            ("Primary 8", "Some text 8", "Some other text 8"),
            ("Primary 9", "Some text 9", "Some other text 9"),
            ("Primary 10", "Some text 10", "Some other text 10"),
        ]:
            await PrimaryModel(
                name=name, some_text=some_text, some_other_text=some_other_text
            ).save()

        for tag_id in [1, 2, 3, 4, 5]:
            await Keyword.objects.create(name=f"Tag {tag_id}")

        p1 = await PrimaryModel.objects.get(pk=1)
        p2 = await PrimaryModel.objects.get(pk=2)
        for i in range(1, 6):
            keyword = await Keyword.objects.get(pk=i)
            if i % 2 == 0:
                await p1.keywords.add(keyword)
            else:
                await p2.keywords.add(keyword)
        models = await PrimaryModel.objects.prefetch_related("keywords").limit(5).all()

        # This test fails, because of the keywords relation.
        assert len(models) == 5
        assert len(models[0].keywords) == 2
        assert len(models[1].keywords) == 3
        assert len(models[2].keywords) == 0


@pytest.fixture(autouse=True, scope="module")
def create_test_database():
    engine = create_engine(DATABASE_URL)
    metadata.create_all(engine)
    yield
    metadata.drop_all(engine)