"""
Synthetic Data Generator for MangoMAS Local

This module provides a framework for generating synthetic training data
for different specialized capabilities, adaptable across all modules.
"""

import json
import logging
import os
import random
from abc import ABC, abstractmethod
from pathlib import Path
from typing import Any, Callable, Dict, List, Optional, Tuple

import yaml
from tqdm import tqdm

logger = logging.getLogger(__name__)


class SyntheticDataGenerator(ABC):
    """
    Abstract base class for synthetic data generators.
    Each specialized module can implement this interface for data generation.
    """

    def __init__(self, config: Dict[str, Any], output_dir: str = "data/processed"):
        """
        Initialize the synthetic data generator.

        Args:
            config: Configuration for the data generator
            output_dir: Directory to save generated data
        """
        self.config = config
        self.output_dir = Path(output_dir)
        self.output_dir.mkdir(parents=True, exist_ok=True)

        # Set number of examples to generate
        self.num_examples = config.get("synthetic_examples", 1000)

        # Template pool for generation
        self.templates = self._load_templates()

        logger.info(f"Initialized {self.__class__.__name__} with {self.num_examples} examples")

    @abstractmethod
    def _load_templates(self) -> List[Dict[str, Any]]:
        """
        Load templates for data generation.
        Each implementation should define its own templates.

        Returns:
            List of template dictionaries
        """
        pass

    @abstractmethod
    def generate_example(self) -> Dict[str, Any]:
        """
        Generate a single synthetic training example.

        Returns:
            Dictionary with the generated example
        """
        pass

    def generate_dataset(self, filename: str, num_examples: Optional[int] = None) -> str:
        """
        Generate a synthetic dataset and save to a JSONL file.

        Args:
            filename: Name of the output file
            num_examples: Number of examples to generate (overrides config)

        Returns:
            Path to the generated dataset file
        """
        n = num_examples if num_examples is not None else self.num_examples
        output_file = self.output_dir / filename

        logger.info(f"Generating {n} synthetic examples for {self.__class__.__name__}")

        with open(output_file, 'w', encoding='utf-8') as f:
            for _ in tqdm(range(n), desc=f"Generating {filename}"):
                example = self.generate_example()
                f.write(json.dumps(example) + '\n')

        logger.info(f"Generated dataset saved to {output_file}")
        return str(output_file)

    def augment_existing_dataset(self, input_file: str, output_file: Optional[str] = None,
                                ratio: float = 0.5) -> str:
        """
        Augment an existing dataset with synthetic examples.

        Args:
            input_file: Path to the existing dataset
            output_file: Path to save the augmented dataset (or None to overwrite)
            ratio: Ratio of synthetic to original examples

        Returns:
            Path to the augmented dataset
        """
        if output_file is None:
            output_file = input_file

        # Load existing data
        existing_data = []
        try:
            with open(input_file, 'r', encoding='utf-8') as f:
                for line in f:
                    existing_data.append(json.loads(line.strip()))
        except (FileNotFoundError, json.JSONDecodeError) as e:
            logger.warning(f"Error loading existing data: {e}")
            existing_data = []

        # Calculate number of synthetic examples to generate
        n_existing = len(existing_data)
        n_synthetic = int(n_existing * ratio)

        # Generate synthetic examples
        synthetic_data = [self.generate_example() for _ in tqdm(range(n_synthetic),
                         desc=f"Generating augmentation data")]

        # Combine datasets
        combined_data = existing_data + synthetic_data
        random.shuffle(combined_data)

        # Save augmented dataset
        with open(output_file, 'w', encoding='utf-8') as f:
            for item in combined_data:
                f.write(json.dumps(item) + '\n')

        logger.info(f"Augmented dataset with {n_synthetic} synthetic examples, saved to {output_file}")
        return output_file


class SyntheticDataGeneratorRegistry:
    """Registry for all synthetic data generators in the system."""

    _generators = {}

    @classmethod
    def register(cls, module_type: str, generator_class):
        """Register a generator class for a module type."""
        cls._generators[module_type] = generator_class

    @classmethod
    def get_generator(cls, module_type: str, config: Dict[str, Any], output_dir: str) -> SyntheticDataGenerator:
        """Get a generator instance for a module type."""
        if module_type not in cls._generators:
            raise ValueError(f"No generator registered for module type: {module_type}")

        return cls._generators[module_type](config, output_dir)

    @classmethod
    def list_generators(cls) -> List[str]:
        """List all registered generator types."""
        return list(cls._generators.keys())
"""