"""Container setup module for registering all services and dependencies."""

import logging
from typing import Optional

from .app_config import AppConfig
from .dependency_container import DependencyContainer, ServiceLifetime
from ..tts.provider_factory import TTSProviderFactory
from ..stt.provider_factory import STTProviderFactory
from ..translation.provider_factory import TranslationProviderFactory
from ...domain.interfaces.audio_processing import IAudioProcessingService
from ...domain.interfaces.speech_recognition import ISpeechRecognitionService
from ...domain.interfaces.translation import ITranslationService
from ...domain.interfaces.speech_synthesis import ISpeechSynthesisService
from ...domain.services.audio_processing_service import AudioProcessingService
from ...application.services.audio_processing_service import AudioProcessingApplicationService
from ...application.services.configuration_service import ConfigurationApplicationService

logger = logging.getLogger(__name__)


def setup_container(config_file: Optional[str] = None) -> DependencyContainer:
    """
    Set up and configure the dependency injection container with all services.

    Args:
        config_file: Optional path to configuration file

    Returns:
        DependencyContainer: Configured container instance
    """
    logger.info("Setting up dependency injection container")

    # Create configuration
    config = AppConfig(config_file=config_file)

    # Create container with configuration
    container = DependencyContainer(config)

    # Register core services
    _register_core_services(container, config)

    # Register domain services
    _register_domain_services(container)

    # Register application services
    _register_application_services(container)

    # Register provider services
    _register_provider_services(container)

    logger.info("Dependency injection container setup completed")
    return container


def _register_core_services(container: DependencyContainer, config: AppConfig) -> None:
    """
    Register core infrastructure services.

    Args:
        container: Dependency container
        config: Application configuration
    """
    logger.info("Registering core services")

    # Configuration is already registered as singleton in container constructor
    # But we ensure it's the same instance
    container.register_singleton(AppConfig, config)

    # Register provider factories as singletons
    container.register_singleton(
        TTSProviderFactory,
        lambda: TTSProviderFactory()
    )

    container.register_singleton(
        STTProviderFactory,
        lambda: STTProviderFactory()
    )

    container.register_singleton(
        TranslationProviderFactory,
        lambda: TranslationProviderFactory()
    )

    logger.info("Core services registered")


def _register_domain_services(container: DependencyContainer) -> None:
    """
    Register domain services.

    Args:
        container: Dependency container
    """
    logger.info("Registering domain services")

    # Register domain audio processing service as transient
    # It requires other services to be injected
    def create_audio_processing_service() -> IAudioProcessingService:
        """Factory function for creating audio processing service."""
        # Get provider services from container
        stt_provider = container.get_stt_provider()
        translation_provider = container.get_translation_provider()
        tts_provider = container.get_tts_provider()

        return AudioProcessingService(
            speech_recognition_service=stt_provider,
            translation_service=translation_provider,
            speech_synthesis_service=tts_provider
        )

    container.register_transient(
        IAudioProcessingService,
        create_audio_processing_service
    )

    logger.info("Domain services registered")


def _register_application_services(container: DependencyContainer) -> None:
    """
    Register application services.

    Args:
        container: Dependency container
    """
    logger.info("Registering application services")

    # Register audio processing application service as scoped
    # It manages resources and should be scoped to request/session
    def create_audio_processing_app_service() -> AudioProcessingApplicationService:
        """Factory function for creating audio processing application service."""
        return AudioProcessingApplicationService(container)

    container.register_scoped(
        AudioProcessingApplicationService,
        create_audio_processing_app_service
    )

    # Register configuration application service as singleton
    # Configuration service can be shared across requests
    def create_configuration_app_service() -> ConfigurationApplicationService:
        """Factory function for creating configuration application service."""
        return ConfigurationApplicationService(container)

    container.register_singleton(
        ConfigurationApplicationService,
        create_configuration_app_service
    )

    logger.info("Application services registered")


def _register_provider_services(container: DependencyContainer) -> None:
    """
    Register provider services with fallback logic.

    Args:
        container: Dependency container
    """
    logger.info("Registering provider services")

    # Register TTS provider service as transient with fallback
    def create_tts_provider() -> ISpeechSynthesisService:
        """Factory function for creating TTS provider with fallback."""
        return container.get_tts_provider()

    container.register_transient(
        ISpeechSynthesisService,
        create_tts_provider
    )

    # Register STT provider service as transient with fallback
    def create_stt_provider() -> ISpeechRecognitionService:
        """Factory function for creating STT provider with fallback."""
        return container.get_stt_provider()

    container.register_transient(
        ISpeechRecognitionService,
        create_stt_provider
    )

    # Register translation provider service as transient with fallback
    def create_translation_provider() -> ITranslationService:
        """Factory function for creating translation provider with fallback."""
        return container.get_translation_provider()

    container.register_transient(
        ITranslationService,
        create_translation_provider
    )

    logger.info("Provider services registered")


def configure_logging(config: AppConfig) -> None:
    """
    Configure application logging based on configuration.

    Args:
        config: Application configuration
    """
    try:
        logging_config = config.get_logging_config()

        # Configure root logger
        root_logger = logging.getLogger()
        root_logger.setLevel(getattr(logging, logging_config['level'].upper(), logging.INFO))

        # Clear existing handlers
        for handler in root_logger.handlers[:]:
            root_logger.removeHandler(handler)

        # Create console handler
        console_handler = logging.StreamHandler()
        console_handler.setLevel(root_logger.level)

        # Create formatter
        formatter = logging.Formatter(logging_config['format'])
        console_handler.setFormatter(formatter)

        # Add console handler
        root_logger.addHandler(console_handler)

        # Add file handler if enabled
        if logging_config.get('enable_file_logging', False):
            from logging.handlers import RotatingFileHandler

            file_handler = RotatingFileHandler(
                logging_config['log_file_path'],
                maxBytes=logging_config['max_log_file_size_mb'] * 1024 * 1024,
                backupCount=logging_config['backup_count']
            )
            file_handler.setLevel(root_logger.level)
            file_handler.setFormatter(formatter)

            root_logger.addHandler(file_handler)

        logger.info(f"Logging configured: level={logging_config['level']}")

    except Exception as e:
        # Fallback to basic logging configuration
        logging.basicConfig(
            level=logging.INFO,
            format='%(asctime)s - %(name)s - %(levelname)s - %(message)s'
        )
        logger.warning(f"Failed to configure logging from config, using defaults: {e}")


def create_configured_container(config_file: Optional[str] = None) -> DependencyContainer:
    """
    Create and configure a complete dependency injection container.

    This is the main entry point for setting up the application's dependency injection.

    Args:
        config_file: Optional path to configuration file

    Returns:
        DependencyContainer: Fully configured container
    """
    try:
        logger.info("Creating configured container...")

        # Setup container
        logger.info("Setting up container...")
        container = setup_container(config_file)
        logger.info("Container setup completed")

        # Configure logging
        logger.info("Configuring logging...")
        config = container.resolve(AppConfig)
        configure_logging(config)
        logger.info("Logging configuration completed")

        # Validate container setup
        logger.info("Starting container validation...")
        try:
            _validate_container_setup(container)
            logger.info("Container validation completed")
        except Exception as validation_error:
            logger.error(f"Container validation failed: {validation_error}", exception=validation_error)
            # For now, let's continue even if validation fails to see if the app works
            logger.warning("Continuing despite validation failure...")

        logger.info("Application container created and configured successfully")
        return container

    except Exception as e:
        logger.error(f"Failed to create configured container: {e}", exception=e)
        raise


def _validate_container_setup(container: DependencyContainer) -> None:
    """
    Validate that the container is properly set up.

    Args:
        container: Container to validate

    Raises:
        RuntimeError: If validation fails
    """
    logger.info("Validating container setup")

    required_services = [
        AppConfig,
        TTSProviderFactory,
        STTProviderFactory,
        TranslationProviderFactory,
        IAudioProcessingService,
        AudioProcessingApplicationService,
        ConfigurationApplicationService,
        ISpeechSynthesisService,
        ISpeechRecognitionService,
        ITranslationService
    ]

    missing_services = []

    logger.info("Checking service registrations...")
    for service_type in required_services:
        logger.info(f"Checking registration for: {service_type.__name__}")
        if not container.is_registered(service_type):
            missing_services.append(service_type.__name__)
            logger.error(f"Service not registered: {service_type.__name__}")
        else:
            logger.info(f"Service registered: {service_type.__name__}")

    if missing_services:
        error_msg = f"Container validation failed. Missing services: {missing_services}"
        logger.error(error_msg)
        raise RuntimeError(error_msg)

    # Test service resolution
    logger.info("Testing service resolution...")
    try:
        logger.info("Resolving AppConfig...")
        config = container.resolve(AppConfig)
        logger.info("AppConfig resolved successfully")

        logger.info("Resolving AudioProcessingApplicationService...")
        app_service = container.resolve(AudioProcessingApplicationService)
        logger.info("AudioProcessingApplicationService resolved successfully")

        logger.info("Resolving ConfigurationApplicationService...")
        config_service = container.resolve(ConfigurationApplicationService)
        logger.info("ConfigurationApplicationService resolved successfully")

        logger.info("Container validation successful")

    except Exception as e:
        error_msg = f"Container validation failed during service resolution: {e}"
        logger.error(error_msg, exception=e)
        raise RuntimeError(error_msg)


def get_service_registry_info(container: DependencyContainer) -> dict:
    """
    Get information about registered services in the container.

    Args:
        container: Container to inspect

    Returns:
        dict: Service registry information
    """
    try:
        registered_services = container.get_registered_services()

        # Get provider availability
        config = container.resolve(AppConfig)
        tts_factory = container.resolve(TTSProviderFactory)
        stt_factory = container.resolve(STTProviderFactory)
        translation_factory = container.resolve(TranslationProviderFactory)

        provider_info = {
            'tts_providers': tts_factory.get_available_providers(),
            'stt_providers': stt_factory.get_available_providers(),
            'translation_providers': [p.value for p in translation_factory.get_available_providers()]
        }

        return {
            'registered_services': registered_services,
            'provider_availability': provider_info,
            'configuration_summary': {
                'config_file': config.config_file,
                'temp_dir': config.processing.temp_dir,
                'log_level': config.logging.level,
                'tts_preferred_providers': config.tts.preferred_providers,
                'stt_default_model': config.stt.default_model,
                'translation_default_provider': config.translation.default_provider
            }
        }

    except Exception as e:
        logger.error(f"Failed to get service registry info: {e}")
        return {
            'error': str(e),
            'registered_services': container.get_registered_services() if container else {}
        }


# Global container instance management
_global_container: Optional[DependencyContainer] = None


def initialize_global_container(config_file: Optional[str] = None) -> DependencyContainer:
    """
    Initialize the global container instance.

    Args:
        config_file: Optional configuration file path

    Returns:
        DependencyContainer: Global container instance
    """
    global _global_container

    if _global_container is not None:
        logger.warning("Global container already initialized, cleaning up previous instance")
        _global_container.cleanup()

    _global_container = create_configured_container(config_file)
    logger.info("Global container initialized")

    return _global_container


def get_global_container() -> DependencyContainer:
    """
    Get the global container instance.

    Returns:
        DependencyContainer: Global container instance

    Raises:
        RuntimeError: If container is not initialized
    """
    global _global_container

    if _global_container is None:
        logger.info("Global container not initialized, creating with defaults")
        _global_container = create_configured_container()

    return _global_container


def cleanup_global_container() -> None:
    """Cleanup the global container instance."""
    global _global_container

    if _global_container is not None:
        _global_container.cleanup()
        _global_container = None
        logger.info("Global container cleaned up")