# services/tenant/app/main.py
"""
Tenant Service FastAPI 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 tenants, tenant_members, tenant_operations, webhooks, internal_demo
from shared.service_base import StandardFastAPIService


class TenantService(StandardFastAPIService):
    """Tenant Service with standardized setup"""

    expected_migration_version = "00001"

    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()
                    # For now, just log the version instead of strict checking to avoid startup failures
                    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
        tenant_expected_tables = ['tenants', 'tenant_members', 'subscriptions']
        # Note: api_prefix is empty because RouteBuilder already includes /api/v1
        super().__init__(
            service_name="tenant-service",
            app_name="Tenant Management Service",
            description="Multi-tenant bakery management service",
            version="1.0.0",
            log_level=settings.LOG_LEVEL,
            api_prefix="",
            database_manager=database_manager,
            expected_tables=tenant_expected_tables
        )

    async def on_startup(self, app: FastAPI):
        """Custom startup logic for tenant service"""
        # Import models to ensure they're registered with SQLAlchemy
        from app.models.tenants import Tenant, TenantMember, Subscription
        self.logger.info("Tenant models imported successfully")

    async def on_shutdown(self, app: FastAPI):
        """Custom shutdown logic for tenant service"""
        # Database cleanup is handled by the base class
        pass

    def get_service_features(self):
        """Return tenant-specific features"""
        return [
            "multi_tenant_management",
            "subscription_management",
            "tenant_isolation",
            "webhook_notifications",
            "member_management"
        ]

    def setup_custom_endpoints(self):
        """Setup custom endpoints for tenant service"""
        @self.app.get("/metrics")
        async def metrics():
            """Prometheus metrics endpoint"""
            if self.metrics_collector:
                return self.metrics_collector.get_metrics()
            return {"metrics": "not_available"}


# Create service instance
service = TenantService()

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

# Setup standard endpoints
service.setup_standard_endpoints()

# Setup custom endpoints
service.setup_custom_endpoints()

# Include routers
service.add_router(tenants.router, tags=["tenants"])
service.add_router(tenant_members.router, tags=["tenant-members"])
service.add_router(tenant_operations.router, tags=["tenant-operations"])
service.add_router(webhooks.router, tags=["webhooks"])
service.add_router(internal_demo.router, tags=["internal"])

if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=8000)