# ================================================================
# services/production/app/main.py
# ================================================================
"""
Production Service - FastAPI Application
Production planning and batch management service
"""

import time
from fastapi import FastAPI, Request
from sqlalchemy import text
from app.core.config import settings
from app.core.database import database_manager
from app.api.production import router as production_router
from app.services.production_alert_service import ProductionAlertService
from shared.service_base import StandardFastAPIService


class ProductionService(StandardFastAPIService):
    """Production Service with standardized setup"""

    expected_migration_version = "001_initial_production"

    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:
                result = await session.execute(text("SELECT version_num FROM alembic_version"))
                version = result.scalar()
                if version != self.expected_migration_version:
                    self.logger.error(f"Migration version mismatch: expected {self.expected_migration_version}, got {version}")
                    raise RuntimeError(f"Migration version mismatch: expected {self.expected_migration_version}, got {version}")
                self.logger.info(f"Migration verification successful: {version}")
        except Exception as e:
            self.logger.error(f"Migration verification failed: {e}")
            raise

    def __init__(self):
        # Define expected database tables for health checks
        production_expected_tables = [
            'production_batches', 'production_schedules', 'production_capacity',
            'quality_check_templates', 'quality_checks', 'equipment'
        ]

        self.alert_service = None

        # Create custom checks for alert service
        async def check_alert_service():
            """Check production alert service health"""
            try:
                return bool(self.alert_service) if self.alert_service else False
            except Exception as e:
                self.logger.error("Alert service health check failed", error=str(e))
                return False

        super().__init__(
            service_name=settings.SERVICE_NAME,
            app_name=settings.APP_NAME,
            description=settings.DESCRIPTION,
            version=settings.VERSION,
            api_prefix="/api/v1",
            database_manager=database_manager,
            expected_tables=production_expected_tables,
            custom_health_checks={"alert_service": check_alert_service}
        )

    async def on_startup(self, app: FastAPI):
        """Custom startup logic for production service"""
        # Initialize alert service
        self.alert_service = ProductionAlertService(settings)
        await self.alert_service.start()
        self.logger.info("Production alert service started")

        # Store alert service in app state
        app.state.alert_service = self.alert_service

    async def on_shutdown(self, app: FastAPI):
        """Custom shutdown logic for production service"""
        # Stop alert service
        if self.alert_service:
            await self.alert_service.stop()
            self.logger.info("Alert service stopped")

    def get_service_features(self):
        """Return production-specific features"""
        return [
            "production_planning",
            "batch_management",
            "production_scheduling",
            "quality_control",
            "equipment_management",
            "capacity_planning",
            "alert_notifications"
        ]

    def setup_custom_middleware(self):
        """Setup custom middleware for production service"""
        @self.app.middleware("http")
        async def logging_middleware(request: Request, call_next):
            """Add request logging middleware"""
            start_time = time.time()
            response = await call_next(request)
            process_time = time.time() - start_time

            self.logger.info("HTTP request processed",
                            method=request.method,
                            url=str(request.url),
                            status_code=response.status_code,
                            process_time=round(process_time, 4))

            return response


# Create service instance
service = ProductionService()

# Create FastAPI app with standardized setup
app = service.create_app()

# Setup standard endpoints
service.setup_standard_endpoints()

# Setup custom middleware
service.setup_custom_middleware()

# Include routers
service.add_router(production_router)


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