import pytest
from app import create_app
from models import db


class TestAppFactory:
    def test_create_app_default_config(self):
        app = create_app()
        assert app is not None
        assert app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] is False
    
    def test_create_app_testing_config(self):
        app = create_app('testing')
        assert app is not None
        assert app.config['TESTING'] is True
        assert app.config['SQLALCHEMY_DATABASE_URI'] == 'sqlite:///:memory:'
    
    def test_create_app_development_config(self):
        app = create_app('development')
        assert app is not None
        assert app.config['DEBUG'] is True


class TestAppRoutes:
    def test_index_route(self, client):
        response = client.get('/')
        assert response.status_code == 200
    
    def test_assessments_route_exists(self, client):
        response = client.get('/assessments/')
        assert response.status_code == 200
    
    def test_exercises_route_prefix_exists(self, client):
        response = client.get('/exercises/')
        assert response.status_code in [200, 404]  # Route exists but may need parameters
    
    def test_grading_route_prefix_exists(self, client):
        response = client.get('/grading/')
        assert response.status_code in [200, 404]  # Route exists but may need parameters


class TestDatabase:
    def test_database_creation(self, app):
        with app.app_context():
            db.create_all()
            # Use inspector to get table names in SQLAlchemy 2.0+
            from sqlalchemy import inspect
            inspector = inspect(db.engine)
            tables = inspector.get_table_names()
            expected_tables = ['class_group', 'student', 'assessment', 'exercise', 'grading_element', 'grade']
            for table in expected_tables:
                assert table in tables
    
    def test_database_initialization(self, app):
        with app.app_context():
            assert db is not None
            assert hasattr(db, 'session')
            assert hasattr(db, 'Model')