src/application/error_handling/error_mapper.py

"""Error message mapping for user-friendly error handling."""

import logging
from typing import Dict, Optional, Any
from enum import Enum

from ...domain.exceptions import (
    DomainException,
    InvalidAudioFormatException,
    InvalidTextContentException,
    TranslationFailedException,
    SpeechRecognitionException,
    SpeechSynthesisException,
    InvalidVoiceSettingsException,
    AudioProcessingException
)

logger = logging.getLogger(__name__)


class ErrorSeverity(Enum):
    """Error severity levels."""
    LOW = "low"
    MEDIUM = "medium"
    HIGH = "high"
    CRITICAL = "critical"


class ErrorCategory(Enum):
    """Error categories for classification."""
    VALIDATION = "validation"
    PROCESSING = "processing"
    SYSTEM = "system"
    EXTERNAL = "external"
    CONFIGURATION = "configuration"


class ErrorMapping:
    """Error mapping configuration."""

    def __init__(self, user_message: str, error_code: str,
                 severity: ErrorSeverity, category: ErrorCategory,
                 recovery_suggestions: Optional[list] = None,
                 technical_details: Optional[str] = None):
        self.user_message = user_message
        self.error_code = error_code
        self.severity = severity
        self.category = category
        self.recovery_suggestions = recovery_suggestions or []
        self.technical_details = technical_details


class ErrorMapper:
    """Maps domain exceptions to user-friendly error messages."""

    def __init__(self):
        """Initialize error mapper with predefined mappings."""
        self._mappings: Dict[type, ErrorMapping] = {
            # Audio format errors
            InvalidAudioFormatException: ErrorMapping(
                user_message="The uploaded audio file format is not supported. Please use WAV, MP3, FLAC, or OGG format.",
                error_code="INVALID_AUDIO_FORMAT",
                severity=ErrorSeverity.MEDIUM,
                category=ErrorCategory.VALIDATION,
                recovery_suggestions=[
                    "Convert your audio file to a supported format (WAV, MP3, FLAC, or OGG)",
                    "Check that your file is not corrupted",
                    "Ensure the file has a proper audio extension"
                ]
            ),

            # Text content errors
            InvalidTextContentException: ErrorMapping(
                user_message="The text content is invalid or too long. Please check your input.",
                error_code="INVALID_TEXT_CONTENT",
                severity=ErrorSeverity.MEDIUM,
                category=ErrorCategory.VALIDATION,
                recovery_suggestions=[
                    "Ensure text is not empty",
                    "Check that text length is within limits (max 10,000 characters)",
                    "Verify text encoding is valid"
                ]
            ),

            # Translation errors
            TranslationFailedException: ErrorMapping(
                user_message="Translation failed. This might be due to unsupported language pairs or service issues.",
                error_code="TRANSLATION_FAILED",
                severity=ErrorSeverity.HIGH,
                category=ErrorCategory.PROCESSING,
                recovery_suggestions=[
                    "Try a different target language",
                    "Check if the source language is correctly detected",
                    "Retry the operation after a few moments",
                    "Ensure the text is in a supported language"
                ]
            ),

            # Speech recognition errors
            SpeechRecognitionException: ErrorMapping(
                user_message="Speech recognition failed. The audio might be unclear or in an unsupported language.",
                error_code="SPEECH_RECOGNITION_FAILED",
                severity=ErrorSeverity.HIGH,
                category=ErrorCategory.PROCESSING,
                recovery_suggestions=[
                    "Ensure audio quality is good (clear speech, minimal background noise)",
                    "Try a different speech recognition model",
                    "Check that the audio contains speech in a supported language",
                    "Verify audio file is not corrupted"
                ]
            ),

            # Speech synthesis errors
            SpeechSynthesisException: ErrorMapping(
                user_message="Text-to-speech generation failed. This might be due to voice availability or text issues.",
                error_code="SPEECH_SYNTHESIS_FAILED",
                severity=ErrorSeverity.HIGH,
                category=ErrorCategory.PROCESSING,
                recovery_suggestions=[
                    "Try a different voice",
                    "Check if the text contains unsupported characters",
                    "Reduce text length if it's very long",
                    "Retry with a different TTS provider"
                ]
            ),

            # Voice settings errors
            InvalidVoiceSettingsException: ErrorMapping(
                user_message="Voice settings are invalid. Please check speed, voice selection, and language settings.",
                error_code="INVALID_VOICE_SETTINGS",
                severity=ErrorSeverity.MEDIUM,
                category=ErrorCategory.VALIDATION,
                recovery_suggestions=[
                    "Ensure speed is between 0.5 and 2.0",
                    "Select a valid voice from the available options",
                    "Check that the language is supported",
                    "Verify voice is available for the selected language"
                ]
            ),

            # General audio processing errors
            AudioProcessingException: ErrorMapping(
                user_message="Audio processing failed. There was an issue processing your audio file.",
                error_code="AUDIO_PROCESSING_FAILED",
                severity=ErrorSeverity.HIGH,
                category=ErrorCategory.PROCESSING,
                recovery_suggestions=[
                    "Check that your audio file is valid and not corrupted",
                    "Try uploading a different audio file",
                    "Ensure file size is within limits",
                    "Retry the operation"
                ]
            ),

            # Validation errors
            ValueError: ErrorMapping(
                user_message="Invalid input provided. Please check your request parameters.",
                error_code="VALIDATION_ERROR",
                severity=ErrorSeverity.MEDIUM,
                category=ErrorCategory.VALIDATION,
                recovery_suggestions=[
                    "Check all required fields are provided",
                    "Verify parameter values are within valid ranges",
                    "Ensure file formats are supported"
                ]
            ),

            # File size errors
            PermissionError: ErrorMapping(
                user_message="Permission denied. Unable to access required files or directories.",
                error_code="PERMISSION_ERROR",
                severity=ErrorSeverity.HIGH,
                category=ErrorCategory.SYSTEM,
                recovery_suggestions=[
                    "Check file permissions",
                    "Ensure temporary directory is writable",
                    "Contact system administrator if issue persists"
                ]
            ),

            # Memory errors
            MemoryError: ErrorMapping(
                user_message="Insufficient memory to process the request. Try with a smaller file.",
                error_code="MEMORY_ERROR",
                severity=ErrorSeverity.HIGH,
                category=ErrorCategory.SYSTEM,
                recovery_suggestions=[
                    "Use a smaller audio file",
                    "Try processing shorter audio segments",
                    "Retry the operation later"
                ]
            ),

            # Timeout errors
            TimeoutError: ErrorMapping(
                user_message="Processing timed out. The operation took too long to complete.",
                error_code="TIMEOUT_ERROR",
                severity=ErrorSeverity.HIGH,
                category=ErrorCategory.SYSTEM,
                recovery_suggestions=[
                    "Try with a shorter audio file",
                    "Retry the operation",
                    "Check system load and try again later"
                ]
            )
        }

        # Default mapping for unknown errors
        self._default_mapping = ErrorMapping(
            user_message="An unexpected error occurred. Please try again or contact support.",
            error_code="UNKNOWN_ERROR",
            severity=ErrorSeverity.CRITICAL,
            category=ErrorCategory.SYSTEM,
            recovery_suggestions=[
                "Retry the operation",
                "Check your input parameters",
                "Contact support if the issue persists"
            ]
        )

    def map_exception(self, exception: Exception, context: Optional[Dict[str, Any]] = None) -> ErrorMapping:
        """
        Map an exception to user-friendly error information.

        Args:
            exception: The exception to map
            context: Optional context information

        Returns:
            ErrorMapping: Mapped error information
        """
        try:
            # Get mapping for exception type
            mapping = self._mappings.get(type(exception))

            if mapping is None:
                # Try parent classes for domain exceptions
                for exc_type in type(exception).__mro__:
                    if exc_type in self._mappings:
                        mapping = self._mappings[exc_type]
                        break

            if mapping is None:
                # Use default mapping
                mapping = self._default_mapping
                logger.warning(f"No mapping found for exception type: {type(exception).__name__}")

            # Add context-specific information if available
            if context:
                mapping = self._enhance_mapping_with_context(mapping, exception, context)

            logger.debug(f"Mapped {type(exception).__name__} to {mapping.error_code}")
            return mapping

        except Exception as e:
            logger.error(f"Error mapping exception {type(exception).__name__}: {e}")
            return self._default_mapping

    def _enhance_mapping_with_context(self, mapping: ErrorMapping, exception: Exception,
                                    context: Dict[str, Any]) -> ErrorMapping:
        """
        Enhance error mapping with context-specific information.

        Args:
            mapping: Base error mapping
            exception: Original exception
            context: Context information

        Returns:
            ErrorMapping: Enhanced error mapping
        """
        try:
            # Create a copy of the mapping to avoid modifying the original
            enhanced_mapping = ErrorMapping(
                user_message=mapping.user_message,
                error_code=mapping.error_code,
                severity=mapping.severity,
                category=mapping.category,
                recovery_suggestions=mapping.recovery_suggestions.copy(),
                technical_details=mapping.technical_details
            )

            # Add context-specific enhancements
            if 'file_name' in context:
                enhanced_mapping.user_message += f" (File: {context['file_name']})"

            if 'operation' in context:
                enhanced_mapping.technical_details = f"Failed during {context['operation']}: {str(exception)}"

            if 'correlation_id' in context:
                enhanced_mapping.technical_details = (
                    f"{enhanced_mapping.technical_details or str(exception)} "
                    f"[ID: {context['correlation_id']}]"
                )

            # Add provider-specific suggestions
            if 'provider' in context:
                provider = context['provider']
                if isinstance(exception, (SpeechRecognitionException, SpeechSynthesisException, TranslationFailedException)):
                    enhanced_mapping.recovery_suggestions.append(f"Try switching from {provider} to an alternative provider")

            # Add file size specific suggestions
            if 'file_size' in context and context['file_size'] > 50 * 1024 * 1024:  # 50MB
                enhanced_mapping.recovery_suggestions.insert(0, "Try with a smaller file (under 50MB)")

            return enhanced_mapping

        except Exception as e:
            logger.error(f"Error enhancing mapping with context: {e}")
            return mapping

    def get_error_code_from_exception(self, exception: Exception) -> str:
        """
        Get error code from exception.

        Args:
            exception: Exception to get code for

        Returns:
            str: Error code
        """
        mapping = self.map_exception(exception)
        return mapping.error_code

    def get_user_message_from_exception(self, exception: Exception,
                                      context: Optional[Dict[str, Any]] = None) -> str:
        """
        Get user-friendly message from exception.

        Args:
            exception: Exception to get message for
            context: Optional context information

        Returns:
            str: User-friendly error message
        """
        mapping = self.map_exception(exception, context)
        return mapping.user_message

    def get_recovery_suggestions(self, exception: Exception,
                               context: Optional[Dict[str, Any]] = None) -> list:
        """
        Get recovery suggestions for an exception.

        Args:
            exception: Exception to get suggestions for
            context: Optional context information

        Returns:
            list: List of recovery suggestions
        """
        mapping = self.map_exception(exception, context)
        return mapping.recovery_suggestions

    def add_custom_mapping(self, exception_type: type, mapping: ErrorMapping) -> None:
        """
        Add a custom error mapping.

        Args:
            exception_type: Exception type to map
            mapping: Error mapping configuration
        """
        self._mappings[exception_type] = mapping
        logger.info(f"Added custom mapping for {exception_type.__name__}")

    def get_all_error_codes(self) -> list:
        """
        Get all available error codes.

        Returns:
            list: List of all error codes
        """
        codes = [mapping.error_code for mapping in self._mappings.values()]
        codes.append(self._default_mapping.error_code)
        return list(set(codes))