"""Service test fixtures for Mantimon TCG.

This module provides fixtures for testing services that use both
Redis and PostgreSQL. Uses dev containers like the db tests.

Prerequisites:
    docker compose up -d  # Start Postgres (5433) and Redis (6380)
"""

import contextlib
import os
from collections.abc import AsyncGenerator
from typing import Any
from uuid import uuid4

import psycopg2
import pytest
import pytest_asyncio
import redis.asyncio as aioredis
from alembic import command
from alembic.config import Config
from sqlalchemy import pool
from sqlalchemy.ext.asyncio import (
    AsyncSession,
    async_sessionmaker,
    create_async_engine,
)

from app.core.config import RulesConfig
from app.core.enums import TurnPhase
from app.core.models.game_state import GameState, PlayerState

# =============================================================================
# Configuration
# =============================================================================

TEST_DATABASE_URL = os.getenv(
    "TEST_DATABASE_URL",
    "postgresql+asyncpg://mantimon:mantimon@localhost:5433/mantimon",
)
SYNC_DATABASE_URL = os.getenv(
    "SYNC_DATABASE_URL",
    "postgresql+psycopg2://mantimon:mantimon@localhost:5433/mantimon",
)
TEST_REDIS_URL = os.getenv(
    "TEST_REDIS_URL",
    "redis://localhost:6380/2",  # Use DB 2 for service tests
)

DB_PARAMS = {
    "host": "localhost",
    "port": 5433,
    "user": "mantimon",
    "password": "mantimon",
    "dbname": "mantimon",
}

TABLES_TO_TRUNCATE = [
    "game_history",
    "active_games",
    "campaign_progress",
    "collections",
    "decks",
    "users",
]


# =============================================================================
# Sync Cleanup Helper
# =============================================================================


def truncate_all_tables() -> None:
    """Truncate all tables using sync psycopg2."""
    conn = psycopg2.connect(**DB_PARAMS)
    try:
        conn.autocommit = True
        with conn.cursor() as cur:
            for table in TABLES_TO_TRUNCATE:
                cur.execute(f"TRUNCATE TABLE {table} CASCADE")
    finally:
        conn.close()


# =============================================================================
# Migration Fixture
# =============================================================================


@pytest.fixture(scope="session", autouse=True)
def _run_migrations() -> None:
    """Run Alembic migrations once per session."""
    alembic_cfg = Config("alembic.ini")
    alembic_cfg.set_main_option("sqlalchemy.url", SYNC_DATABASE_URL)
    command.upgrade(alembic_cfg, "head")


# =============================================================================
# Database Session Fixture
# =============================================================================


@pytest_asyncio.fixture
async def db_session() -> AsyncGenerator[AsyncSession, None]:
    """Provide a fresh async session for each test."""
    engine = create_async_engine(
        TEST_DATABASE_URL,
        echo=False,
        poolclass=pool.NullPool,
    )

    session_factory = async_sessionmaker(
        bind=engine,
        class_=AsyncSession,
        expire_on_commit=False,
    )

    async with session_factory() as session:
        yield session
        with contextlib.suppress(RuntimeError):
            await session.close()

    with contextlib.suppress(RuntimeError):
        await engine.dispose()

    truncate_all_tables()


# =============================================================================
# Redis Fixture
# =============================================================================


@pytest_asyncio.fixture
async def redis_client() -> AsyncGenerator[Any, None]:
    """Provide a Redis client for testing."""
    client = aioredis.from_url(TEST_REDIS_URL, decode_responses=True)
    try:
        # Clear test database before test
        await client.flushdb()
        yield client
    finally:
        # Clean up after test
        try:
            await client.flushdb()
            await client.aclose()
        except RuntimeError:
            pass


# =============================================================================
# GameState Factory
# =============================================================================


def create_test_game_state(
    game_id: str | None = None,
    turn_number: int = 1,
    phase: TurnPhase = TurnPhase.MAIN,
) -> GameState:
    """Create a minimal GameState for testing.

    Args:
        game_id: Optional game ID. Generated if not provided.
        turn_number: Turn number (default 1).
        phase: Turn phase (default MAIN).

    Returns:
        A minimal valid GameState for testing.
    """
    if game_id is None:
        game_id = str(uuid4())

    return GameState(
        game_id=game_id,
        rules=RulesConfig(),
        card_registry={},
        players={
            "player1": PlayerState(player_id="player1"),
            "player2": PlayerState(player_id="player2"),
        },
        current_player_id="player1",
        turn_number=turn_number,
        phase=phase,
        turn_order=["player1", "player2"],
    )


@pytest.fixture
def game_state() -> GameState:
    """Provide a test GameState."""
    return create_test_game_state()


# =============================================================================
# Utility
# =============================================================================


@pytest.fixture
def anyio_backend() -> str:
    """Specify asyncio as the async backend."""
    return "asyncio"