"""Pytest configuration and shared fixtures for Sneaky Klaus tests."""

import pytest

from src.app import create_app
from src.app import db as _db
from src.models import Admin


@pytest.fixture(scope="session")
def app():
    """Create and configure a test Flask application instance.

    This fixture is scoped to the session so the app is created once
    for all tests.

    Yields:
        Flask application configured for testing.
    """
    app = create_app("testing")
    yield app


@pytest.fixture(scope="function")
def db(app):
    """Create a clean database for each test.

    This fixture creates all tables before each test and drops them
    after each test to ensure isolation.

    Args:
        app: Flask application instance from app fixture.

    Yields:
        SQLAlchemy database instance.
    """
    with app.app_context():
        _db.create_all()
        yield _db
        _db.session.remove()
        _db.drop_all()


@pytest.fixture(scope="function")
def client(app, db):  # noqa: ARG001
    """Create a test client for the Flask application.

    Args:
        app: Flask application instance.
        db: Database instance (ensures db is set up first).

    Yields:
        Flask test client.
    """
    with app.test_client() as client:
        yield client


@pytest.fixture
def admin(db):
    """Create an admin user for testing.

    Args:
        db: Database instance.

    Returns:
        Admin model instance.
    """
    from src.app import bcrypt

    admin = Admin(
        email="admin@example.com",
        password_hash=bcrypt.generate_password_hash("testpassword123").decode("utf-8"),
    )
    db.session.add(admin)
    db.session.commit()
    return admin


@pytest.fixture
def exchange_factory(db):
    """Factory for creating test exchanges.

    Args:
        db: Database instance.

    Returns:
        Function that creates and returns Exchange instances.
    """
    from datetime import UTC, datetime, timedelta

    from src.models.exchange import Exchange

    def _create(state="draft", **kwargs):
        exchange = Exchange(
            slug=kwargs.get("slug", Exchange.generate_slug()),
            name=kwargs.get("name", "Test Exchange"),
            budget=kwargs.get("budget", "$25-50"),
            max_participants=kwargs.get("max_participants", 50),
            registration_close_date=kwargs.get(
                "registration_close_date", datetime.now(UTC) + timedelta(days=7)
            ),
            exchange_date=kwargs.get(
                "exchange_date", datetime.now(UTC) + timedelta(days=14)
            ),
            timezone=kwargs.get("timezone", "UTC"),
            state=state,
        )
        db.session.add(exchange)
        db.session.commit()
        return exchange

    return _create


@pytest.fixture
def participant_factory(db, exchange_factory):
    """Factory for creating test participants.

    Args:
        db: Database instance.
        exchange_factory: Exchange factory fixture.

    Returns:
        Function that creates and returns Participant instances.
    """
    from src.models.participant import Participant

    counter = {"value": 0}

    def _create(exchange=None, **kwargs):
        if not exchange:
            exchange = exchange_factory()

        counter["value"] += 1
        participant = Participant(
            exchange_id=exchange.id,
            name=kwargs.get("name", f"Test Participant {counter['value']}"),
            email=kwargs.get("email", f"test{counter['value']}@example.com"),
            gift_ideas=kwargs.get("gift_ideas", "Test ideas"),
            reminder_enabled=kwargs.get("reminder_enabled", True),
            withdrawn_at=kwargs.get("withdrawn_at"),
        )
        db.session.add(participant)
        db.session.commit()
        return participant

    return _create


@pytest.fixture
def auth_participant(client, exchange_factory, participant_factory):
    """Create an authenticated participant session.

    Args:
        client: Flask test client.
        exchange_factory: Exchange factory fixture.
        participant_factory: Participant factory fixture.

    Returns:
        Authenticated participant instance.
    """
    exchange = exchange_factory(state="registration_open")
    participant = participant_factory(exchange=exchange)

    with client.session_transaction() as session:
        session["user_id"] = participant.id
        session["user_type"] = "participant"
        session["exchange_id"] = exchange.id

    return participant