"""
Authentication Service Main Application
"""

from fastapi import FastAPI
from sqlalchemy import text
from app.core.config import settings
from app.core.database import database_manager
from app.api import auth, users, onboarding
from app.services.messaging import setup_messaging, cleanup_messaging
from shared.service_base import StandardFastAPIService


class AuthService(StandardFastAPIService):
    """Authentication Service with standardized setup"""

    async def on_startup(self, app):
        """Custom startup logic including migration verification"""
        await self.verify_migrations()
        await super().on_startup(app)

    async def verify_migrations(self):
        """Verify database schema matches the latest migrations."""
        try:
            async with self.database_manager.get_session() as session:
                # Check if alembic_version table exists
                result = await session.execute(text("""
                    SELECT EXISTS (
                        SELECT FROM information_schema.tables 
                        WHERE table_schema = 'public' 
                        AND table_name = 'alembic_version'
                    )
                """))
                table_exists = result.scalar()
                
                if table_exists:
                    # If table exists, check the version
                    result = await session.execute(text("SELECT version_num FROM alembic_version"))
                    version = result.scalar()
                    self.logger.info(f"Migration verification successful: {version}")
                else:
                    # If table doesn't exist, migrations might not have run yet
                    # This is OK - the migration job should create it
                    self.logger.warning("alembic_version table does not exist yet - migrations may not have run")
                    
        except Exception as e:
            self.logger.warning(f"Migration verification failed (this may be expected during initial setup): {e}")

    def __init__(self):
        # Define expected database tables for health checks
        auth_expected_tables = [
            'users', 'refresh_tokens', 'user_onboarding_progress',
            'user_onboarding_summary', 'login_attempts'
        ]

        # Define custom metrics for auth service
        auth_custom_metrics = {
            "registration_total": {
                "type": "counter",
                "description": "Total user registrations by status",
                "labels": ["status"]
            },
            "login_success_total": {
                "type": "counter",
                "description": "Total successful user logins"
            },
            "login_failure_total": {
                "type": "counter",
                "description": "Total failed user logins by reason",
                "labels": ["reason"]
            },
            "token_refresh_total": {
                "type": "counter",
                "description": "Total token refreshes by status",
                "labels": ["status"]
            },
            "token_verify_total": {
                "type": "counter",
                "description": "Total token verifications by status",
                "labels": ["status"]
            },
            "logout_total": {
                "type": "counter",
                "description": "Total user logouts by status",
                "labels": ["status"]
            },
            "registration_duration_seconds": {
                "type": "histogram",
                "description": "Registration request duration"
            },
            "login_duration_seconds": {
                "type": "histogram",
                "description": "Login request duration"
            },
            "token_refresh_duration_seconds": {
                "type": "histogram",
                "description": "Token refresh duration"
            }
        }

        super().__init__(
            service_name="auth-service",
            app_name="Authentication Service",
            description="Handles user authentication and authorization for bakery forecasting platform",
            version="1.0.0",
            log_level=settings.LOG_LEVEL,
            api_prefix="/api/v1",
            database_manager=database_manager,
            expected_tables=auth_expected_tables,
            enable_messaging=True,
            custom_metrics=auth_custom_metrics
        )

    async def _setup_messaging(self):
        """Setup messaging for auth service"""
        await setup_messaging()
        self.logger.info("Messaging setup complete")

    async def _cleanup_messaging(self):
        """Cleanup messaging for auth service"""
        await cleanup_messaging()

    async def on_shutdown(self, app: FastAPI):
        """Custom shutdown logic for auth service"""
        self.logger.info("Authentication Service shutdown complete")

    def get_service_features(self):
        """Return auth-specific features"""
        return [
            "user_authentication",
            "token_management",
            "user_onboarding",
            "role_based_access",
            "messaging_integration"
        ]


# Create service instance
service = AuthService()

# Create FastAPI app with standardized setup
app = service.create_app(
    docs_url="/docs",
    redoc_url="/redoc"
)

# Setup standard endpoints
service.setup_standard_endpoints()

# Include routers with specific configurations
service.add_router(auth.router, prefix="/api/v1/auth", tags=["authentication"])
service.add_router(users.router, prefix="/api/v1/users", tags=["users"])
service.add_router(onboarding.router, prefix="/api/v1/users", tags=["onboarding"])