"""File generation and management utilities for infrastructure providers."""

import logging
import os
import tempfile
import time
from pathlib import Path
from typing import Optional, Union
import hashlib

logger = logging.getLogger(__name__)


class FileManager:
    """Utility class for managing temporary files and directories."""

    def __init__(self, base_dir: Optional[Union[str, Path]] = None):
        """
        Initialize the file manager.

        Args:
            base_dir: Base directory for file operations (defaults to system temp)
        """
        if base_dir:
            self.base_dir = Path(base_dir)
        else:
            self.base_dir = Path(tempfile.gettempdir()) / "tts_app"

        self.base_dir.mkdir(exist_ok=True)
        logger.info(f"FileManager initialized with base directory: {self.base_dir}")

    def create_temp_file(self, suffix: str = ".tmp", prefix: str = "temp", content: bytes = None) -> Path:
        """
        Create a temporary file.

        Args:
            suffix: File suffix/extension
            prefix: File prefix
            content: Optional content to write to the file

        Returns:
            Path: Path to the created temporary file
        """
        timestamp = int(time.time() * 1000)
        filename = f"{prefix}_{timestamp}{suffix}"
        file_path = self.base_dir / filename

        if content:
            with open(file_path, 'wb') as f:
                f.write(content)
        else:
            file_path.touch()

        logger.info(f"Created temporary file: {file_path}")
        return file_path

    def create_unique_filename(self, base_name: str, extension: str = "", content_hash: bool = False, content: bytes = None) -> str:
        """
        Create a unique filename.

        Args:
            base_name: Base name for the file
            extension: File extension (with or without dot)
            content_hash: Whether to include content hash in filename
            content: Content to hash (required if content_hash=True)

        Returns:
            str: Unique filename
        """
        timestamp = int(time.time() * 1000)

        if not extension.startswith('.') and extension:
            extension = '.' + extension

        filename = f"{base_name}_{timestamp}"

        if content_hash and content:
            hash_obj = hashlib.md5(content)
            content_hash_str = hash_obj.hexdigest()[:8]
            filename += f"_{content_hash_str}"

        filename += extension
        return filename

    def save_audio_file(self, audio_data: bytes, format: str = "wav", prefix: str = "audio") -> Path:
        """
        Save audio data to a file.

        Args:
            audio_data: Raw audio data
            format: Audio format (wav, mp3, etc.)
            prefix: Filename prefix

        Returns:
            Path: Path to the saved audio file
        """
        if not format.startswith('.'):
            format = '.' + format

        filename = self.create_unique_filename(prefix, format, content_hash=True, content=audio_data)
        file_path = self.base_dir / filename

        with open(file_path, 'wb') as f:
            f.write(audio_data)

        logger.info(f"Saved audio file: {file_path} ({len(audio_data)} bytes)")
        return file_path

    def save_text_file(self, text_content: str, encoding: str = "utf-8", prefix: str = "text") -> Path:
        """
        Save text content to a file.

        Args:
            text_content: Text content to save
            encoding: Text encoding
            prefix: Filename prefix

        Returns:
            Path: Path to the saved text file
        """
        filename = self.create_unique_filename(prefix, ".txt")
        file_path = self.base_dir / filename

        with open(file_path, 'w', encoding=encoding) as f:
            f.write(text_content)

        logger.info(f"Saved text file: {file_path} ({len(text_content)} characters)")
        return file_path

    def cleanup_file(self, file_path: Union[str, Path]) -> bool:
        """
        Clean up a single file.

        Args:
            file_path: Path to the file to clean up

        Returns:
            bool: True if file was successfully deleted, False otherwise
        """
        try:
            path = Path(file_path)
            if path.exists() and path.is_file():
                path.unlink()
                logger.info(f"Cleaned up file: {path}")
                return True
            return False
        except Exception as e:
            logger.warning(f"Failed to cleanup file {file_path}: {str(e)}")
            return False

    def cleanup_old_files(self, max_age_hours: int = 24, pattern: str = "*") -> int:
        """
        Clean up old files in the base directory.

        Args:
            max_age_hours: Maximum age of files to keep in hours
            pattern: File pattern to match (glob pattern)

        Returns:
            int: Number of files cleaned up
        """
        try:
            current_time = time.time()
            max_age_seconds = max_age_hours * 3600
            cleaned_count = 0

            for file_path in self.base_dir.glob(pattern):
                if file_path.is_file():
                    file_age = current_time - file_path.stat().st_mtime
                    if file_age > max_age_seconds:
                        if self.cleanup_file(file_path):
                            cleaned_count += 1

            if cleaned_count > 0:
                logger.info(f"Cleaned up {cleaned_count} old files")

            return cleaned_count

        except Exception as e:
            logger.error(f"Failed to cleanup old files: {str(e)}")
            return 0

    def get_file_info(self, file_path: Union[str, Path]) -> dict:
        """
        Get information about a file.

        Args:
            file_path: Path to the file

        Returns:
            dict: File information
        """
        try:
            path = Path(file_path)
            if not path.exists():
                return {'exists': False}

            stat = path.stat()
            return {
                'exists': True,
                'size_bytes': stat.st_size,
                'created_time': stat.st_ctime,
                'modified_time': stat.st_mtime,
                'is_file': path.is_file(),
                'is_directory': path.is_dir(),
                'extension': path.suffix,
                'name': path.name,
                'parent': str(path.parent)
            }
        except Exception as e:
            logger.error(f"Failed to get file info for {file_path}: {str(e)}")
            return {'exists': False, 'error': str(e)}

    def ensure_directory(self, dir_path: Union[str, Path]) -> Path:
        """
        Ensure a directory exists, creating it if necessary.

        Args:
            dir_path: Path to the directory

        Returns:
            Path: Path to the directory
        """
        path = Path(dir_path)
        path.mkdir(parents=True, exist_ok=True)
        logger.info(f"Ensured directory exists: {path}")
        return path

    def get_disk_usage(self) -> dict:
        """
        Get disk usage information for the base directory.

        Returns:
            dict: Disk usage information
        """
        try:
            total_size = 0
            file_count = 0

            for file_path in self.base_dir.rglob('*'):
                if file_path.is_file():
                    total_size += file_path.stat().st_size
                    file_count += 1

            return {
                'base_directory': str(self.base_dir),
                'total_size_bytes': total_size,
                'total_size_mb': total_size / (1024 * 1024),
                'file_count': file_count
            }
        except Exception as e:
            logger.error(f"Failed to get disk usage: {str(e)}")
            return {'error': str(e)}


class AudioFileGenerator:
    """Utility class for generating audio files from raw audio data."""

    @staticmethod
    def save_wav_file(audio_data: bytes, sample_rate: int, file_path: Union[str, Path], channels: int = 1, sample_width: int = 2) -> Path:
        """
        Save raw audio data as a WAV file.

        Args:
            audio_data: Raw audio data
            sample_rate: Sample rate in Hz
            file_path: Output file path
            channels: Number of audio channels
            sample_width: Sample width in bytes

        Returns:
            Path: Path to the saved WAV file
        """
        try:
            import wave

            path = Path(file_path)

            with wave.open(str(path), 'wb') as wav_file:
                wav_file.setnchannels(channels)
                wav_file.setsampwidth(sample_width)
                wav_file.setframerate(sample_rate)
                wav_file.writeframes(audio_data)

            logger.info(f"Saved WAV file: {path} (sample_rate={sample_rate}, channels={channels})")
            return path

        except Exception as e:
            logger.error(f"Failed to save WAV file: {str(e)}")
            raise

    @staticmethod
    def convert_numpy_to_wav(audio_array, sample_rate: int, file_path: Union[str, Path]) -> Path:
        """
        Convert numpy array to WAV file.

        Args:
            audio_array: Numpy array containing audio data
            sample_rate: Sample rate in Hz
            file_path: Output file path

        Returns:
            Path: Path to the saved WAV file
        """
        try:
            import numpy as np
            import soundfile as sf

            path = Path(file_path)

            # Ensure audio is in the correct format
            if audio_array.dtype != np.float32:
                audio_array = audio_array.astype(np.float32)

            # Normalize if needed
            if np.max(np.abs(audio_array)) > 1.0:
                audio_array = audio_array / np.max(np.abs(audio_array))

            sf.write(str(path), audio_array, sample_rate)

            logger.info(f"Converted numpy array to WAV: {path}")
            return path

        except ImportError:
            logger.error("soundfile library not available for numpy conversion")
            raise
        except Exception as e:
            logger.error(f"Failed to convert numpy array to WAV: {str(e)}")
            raise


class ErrorHandler:
    """Utility class for handling and logging errors in infrastructure providers."""

    def __init__(self, provider_name: str):
        """
        Initialize the error handler.

        Args:
            provider_name: Name of the provider for error context
        """
        self.provider_name = provider_name
        self.logger = logging.getLogger(f"{__name__}.{provider_name}")

    def handle_error(self, error: Exception, context: str = "", reraise_as: type = None) -> None:
        """
        Handle an error with proper logging and optional re-raising.

        Args:
            error: The original error
            context: Additional context about when the error occurred
            reraise_as: Exception type to re-raise as (if None, re-raises original)
        """
        error_msg = f"{self.provider_name} error"
        if context:
            error_msg += f" during {context}"
        error_msg += f": {str(error)}"

        self.logger.error(error_msg, exception=error)

        if reraise_as:
            raise reraise_as(error_msg) from error
        else:
            raise

    def log_warning(self, message: str, context: str = "") -> None:
        """
        Log a warning message.

        Args:
            message: Warning message
            context: Additional context
        """
        warning_msg = f"{self.provider_name}"
        if context:
            warning_msg += f" ({context})"
        warning_msg += f": {message}"

        self.logger.warning(warning_msg)

    def log_info(self, message: str, context: str = "") -> None:
        """
        Log an info message.

        Args:
            message: Info message
            context: Additional context
        """
        info_msg = f"{self.provider_name}"
        if context:
            info_msg += f" ({context})"
        info_msg += f": {message}"

        self.logger.info(info_msg)

    def log_debug(self, message: str, context: str = "") -> None:
        """
        Log a debug message.

        Args:
            message: Debug message
            context: Additional context
        """
        debug_msg = f"{self.provider_name}"
        if context:
            debug_msg += f" ({context})"
        debug_msg += f": {message}"

        self.logger.info(debug_msg)