import pytest
from fastapi.testclient import TestClient
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from sqlalchemy.pool import StaticPool

from app.main import app
from app.core.database import Base, get_db
from app.core.redis import get_redis
from app.models import User, Role, Department

# Use in-memory SQLite for testing
SQLALCHEMY_DATABASE_URL = "sqlite:///:memory:"

engine = create_engine(
    SQLALCHEMY_DATABASE_URL,
    connect_args={"check_same_thread": False},
    poolclass=StaticPool,
)
TestingSessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)


class MockRedis:
    """Mock Redis client for testing."""

    def __init__(self):
        self.store = {}

    def get(self, key):
        return self.store.get(key)

    def set(self, key, value):
        self.store[key] = value

    def setex(self, key, seconds, value):
        self.store[key] = value

    def delete(self, key):
        if key in self.store:
            del self.store[key]

    def scan_iter(self, match=None):
        """Iterate over keys matching a pattern."""
        import fnmatch
        if match is None:
            yield from self.store.keys()
        else:
            pattern = match.replace("*", "**")
            for key in self.store.keys():
                if fnmatch.fnmatch(key, match):
                    yield key


@pytest.fixture(scope="function")
def db():
    """Create a fresh database for each test."""
    Base.metadata.create_all(bind=engine)
    db = TestingSessionLocal()

    # Create default role
    admin_role = Role(
        id="00000000-0000-0000-0000-000000000001",
        name="super_admin",
        permissions={"all": True},
        is_system_role=True,
    )
    db.add(admin_role)

    engineer_role = Role(
        id="00000000-0000-0000-0000-000000000003",
        name="engineer",
        permissions={"projects.read": True, "tasks.read": True, "tasks.write": True},
        is_system_role=False,
    )
    db.add(engineer_role)

    # Create system admin user
    admin_user = User(
        id="00000000-0000-0000-0000-000000000001",
        email="ymirliu@panjit.com.tw",
        name="System Administrator",
        role_id="00000000-0000-0000-0000-000000000001",
        is_active=True,
        is_system_admin=True,
    )
    db.add(admin_user)

    db.commit()

    try:
        yield db
    finally:
        db.close()
        Base.metadata.drop_all(bind=engine)


@pytest.fixture(scope="function")
def mock_redis():
    """Create mock Redis for testing."""
    return MockRedis()


@pytest.fixture(scope="function")
def client(db, mock_redis):
    """Create test client with overridden dependencies."""

    def override_get_db():
        try:
            yield db
        finally:
            pass

    def override_get_redis():
        return mock_redis

    app.dependency_overrides[get_db] = override_get_db
    app.dependency_overrides[get_redis] = override_get_redis

    with TestClient(app) as test_client:
        yield test_client

    app.dependency_overrides.clear()


@pytest.fixture
def admin_token(client, mock_redis):
    """Get an admin token for testing."""
    from app.core.security import create_access_token, create_token_payload

    token_data = create_token_payload(
        user_id="00000000-0000-0000-0000-000000000001",
        email="ymirliu@panjit.com.tw",
        role="super_admin",
        department_id=None,
        is_system_admin=True,
    )
    token = create_access_token(token_data)

    # Store in mock Redis
    mock_redis.setex("session:00000000-0000-0000-0000-000000000001", 900, token)

    return token