"""
Data Processor for MangoMAS Local Training

This module processes the original MangoMAS datasets from JSONL format
into training-ready datasets with proper splits and preprocessing.
"""

import argparse
import json
import logging
from pathlib import Path
from typing import Dict, List, Tuple

import yaml
from sklearn.model_selection import train_test_split
from tqdm import tqdm

logger = logging.getLogger(__name__)


class MangoMASDataProcessor:
    """Process MangoMAS datasets for local training."""

    def __init__(
        self,
        input_dir,
        output_dir=None,
        min_length: int = 10,
        max_length: int = 2048,
        config_path: str = None,
    ):
        """Initialize with input/output directories or config path for flexibility."""
        # Support both test interface and config-driven approach
        if config_path is not None:
            # Config-driven initialization (original functionality)
            with open(config_path, "r") as f:
                self.config = yaml.safe_load(f)
            self.data_config = self.config["data"]
            self.agents_config = self.config["agents"]
            self.input_dir = Path(input_dir) if input_dir else None
            self.output_dir = Path(output_dir) if output_dir else Path("/Volumes/Mango_MAS/data/processed")
            self.min_length = self.data_config.get("preprocessing", {}).get(
                "min_length", min_length
            )
            self.max_length = self.data_config.get("preprocessing", {}).get(
                "max_length", max_length
            )
        else:
            # Direct initialization (test interface)
            self.input_dir = Path(input_dir)
            self.output_dir = Path(output_dir) if output_dir else Path("/Volumes/Mango_MAS/data/processed")
            self.min_length = min_length
            self.max_length = max_length
            self.config = None
            self.data_config = None
            self.agents_config = None

        logging.basicConfig(level=logging.INFO)

    def process_datasets(
        self, input_dir: str, output_dir: str = "/Volumes/Mango_MAS/data/processed"
    ) -> None:
        """
        Process all agent datasets from input directory.

        Args:
            input_dir: Directory containing original JSONL files
            output_dir: Directory to save processed datasets
        """
        input_path = Path(input_dir)
        output_path = Path(output_dir)
        output_path.mkdir(parents=True, exist_ok=True)

        # Define dataset mappings
        datasets = {
            "infrastructure": input_path
            / "infrastructure_agent_synthetic_prompts.jsonl",
            "devsecops": input_path / "devsecops_agent_synthetic_prompts.jsonl",
            "risk_assessment": input_path
            / "risk_assessment_agent_synthetic_prompts.jsonl",
        }

        for agent_type, file_path in datasets.items():
            if file_path.exists():
                logger.info(f"Processing {agent_type} dataset from {file_path}")
                self._process_single_dataset(file_path, output_path, agent_type)
            else:
                logger.warning(f"Dataset file not found: {file_path}")

    def _process_single_dataset(
        self, input_file: Path, output_dir: Path, agent_type: str
    ) -> None:
        """Process a single agent dataset."""
        # Load data
        data = self._load_jsonl(input_file)
        logger.info(f"Loaded {len(data)} samples for {agent_type}")

        # Clean and preprocess
        cleaned_data = self._clean_data(data)
        logger.info(f"After cleaning: {len(cleaned_data)} samples")

        # Convert to training format
        training_data = self._convert_to_training_format(cleaned_data, agent_type)

        # Create splits
        train_data, val_data, test_data = self._create_splits(training_data)

        # Save processed datasets
        self._save_datasets(train_data, val_data, test_data, output_dir, agent_type)

        logger.info(
            f"Saved {agent_type} dataset: "
            f"{len(train_data)} train, {len(val_data)} val, {len(test_data)} test"
        )

    def _load_jsonl(self, file_path: Path) -> List[Dict]:
        """Load data from JSONL file."""
        data = []
        with open(file_path, "r", encoding="utf-8") as f:
            for line_num, line in enumerate(f, 1):
                try:
                    data.append(json.loads(line.strip()))
                except json.JSONDecodeError as e:
                    logger.warning(f"Skipping invalid JSON on line {line_num}: {e}")
        return data

    def _clean_data(self, data: List[Dict]) -> List[Dict]:
        """Clean and validate the data."""
        cleaned = []

        for item in tqdm(data, desc="Cleaning data"):
            # Check required fields
            if not all(key in item for key in ["instruction", "input", "output"]):
                continue

            # Check text lengths
            input_text = f"{item['instruction']} {item['input']}"
            output_text = item["output"]

            if (
                len(input_text) < self.data_config["preprocessing"]["min_length"]
                or len(input_text) > self.data_config["preprocessing"]["max_length"]
            ):
                continue

            if (
                len(output_text) < self.data_config["preprocessing"]["min_length"]
                or len(output_text) > self.data_config["preprocessing"]["max_length"]
            ):
                continue

            cleaned.append(item)

        # Remove duplicates if configured
        if self.data_config["preprocessing"]["remove_duplicates"]:
            cleaned = self._remove_duplicates(cleaned)

        return cleaned

    def _remove_duplicates(self, data: List[Dict]) -> List[Dict]:
        """Remove duplicate entries based on input text."""
        seen_inputs = set()
        unique_data = []

        for item in data:
            input_text = f"{item['instruction']} {item['input']}"
            if input_text not in seen_inputs:
                seen_inputs.add(input_text)
                unique_data.append(item)

        logger.info(f"Removed {len(data) - len(unique_data)} duplicates")
        return unique_data

    def _validate_sample(self, sample: Dict) -> bool:
        """Validate a single sample for required fields and length constraints."""
        # Check required fields
        required_fields = ["instruction", "input", "output", "agent_type"]
        if not all(key in sample for key in required_fields):
            return False

        # Check text lengths
        combined_text = f"{sample['instruction']} {sample['input']} {sample['output']}"
        if len(combined_text) < self.min_length or len(combined_text) > self.max_length:
            return False

        return True

    def _clean_text(self, text: str) -> str:
        """Clean text by normalizing whitespace and removing extra spaces."""
        import re

        # Remove extra whitespace and normalize
        cleaned = re.sub(r"\s+", " ", text.strip())
        return cleaned

    def _format_conversation(self, sample: Dict) -> Dict:
        """Format sample into conversation format suitable for training."""
        # Create conversation text
        if sample.get("input", "").strip():
            conversation_text = f"Human: {sample['instruction']}\n{sample['input']}\n\nAssistant: {sample['output']}"
        else:
            conversation_text = (
                f"Human: {sample['instruction']}\n\nAssistant: {sample['output']}"
            )

        return {
            "text": conversation_text,
            "agent_type": sample["agent_type"],
            "instruction": sample["instruction"],
            "input": sample["input"],
            "output": sample["output"],
        }

    def _split_dataset(
        self,
        data: List[Dict],
        train_ratio: float = 0.8,
        val_ratio: float = 0.1,
        test_ratio: float = 0.1,
    ) -> Tuple[List[Dict], List[Dict], List[Dict]]:
        """Split dataset into train/validation/test sets."""
        if abs(train_ratio + val_ratio + test_ratio - 1.0) > 1e-6:
            raise ValueError(
                f"Split ratios must sum to 1.0, got {train_ratio + val_ratio + test_ratio}"
            )

        if not data:
            return [], [], []

        # Use sklearn for consistent splitting
        from sklearn.model_selection import train_test_split

        # First split: train vs (val + test)
        if len(data) == 1:
            return data, [], []

        train_data, temp_data = train_test_split(
            data, test_size=(val_ratio + test_ratio), random_state=42, shuffle=True
        )

        # Second split: val vs test
        if temp_data and val_ratio > 0 and test_ratio > 0:
            val_ratio_normalized = val_ratio / (val_ratio + test_ratio)
            val_data, test_data = train_test_split(
                temp_data,
                test_size=(1 - val_ratio_normalized),
                random_state=42,
                shuffle=True,
            )
        elif val_ratio > 0:
            val_data, test_data = temp_data, []
        else:
            val_data, test_data = [], temp_data

        return train_data, val_data, test_data

    def _calculate_stats(self, data: List[Dict]) -> Dict:
        """Calculate statistics for the dataset."""
        if not data:
            return {
                "total_samples": 0,
                "avg_length": 0,
                "min_length": 0,
                "max_length": 0,
                "agent_distribution": {},
            }

        lengths = [len(item.get("text", "")) for item in data]
        agent_counts = {}

        for item in data:
            agent = item.get("agent_type", "unknown")
            agent_counts[agent] = agent_counts.get(agent, 0) + 1

        return {
            "total_samples": len(data),
            "avg_length": sum(lengths) / len(lengths),
            "min_length": min(lengths),
            "max_length": max(lengths),
            "agent_distribution": agent_counts,
        }

    def _load_agent_data(self, agent_type: str) -> List[Dict]:
        """Load data for a specific agent type."""
        if not self.input_dir:
            return []

        # Look for files matching the agent type. We intentionally call glob even
        # if the directory may not exist in test environments, since tests patch
        # pathlib.Path.glob.
        pattern = f"*{agent_type}*.jsonl"
        matching_files = list(self.input_dir.glob(pattern))

        data = []
        for file_path in matching_files:
            file_data = self._load_jsonl(file_path)
            data.extend(file_data)

        return data

    def _save_jsonl(self, data: List[Dict], output_path: Path) -> None:
        """Save data to JSONL file."""
        output_path.parent.mkdir(parents=True, exist_ok=True)
        with open(output_path, "w", encoding="utf-8") as f:
            for item in data:
                f.write(json.dumps(item, ensure_ascii=False) + "\n")

    def _save_stats(self, stats: Dict, output_path: Path) -> None:
        """Save statistics to JSON file."""
        output_path.parent.mkdir(parents=True, exist_ok=True)
        with open(output_path, "w", encoding="utf-8") as f:
            json.dump(stats, f, indent=2, ensure_ascii=False)

    def process_agent(
        self,
        agent_type: str,
        train_ratio: float = 0.8,
        val_ratio: float = 0.1,
        test_ratio: float = 0.1,
    ) -> None:
        """Process data for a single agent type."""
        # Load data
        data = self._load_agent_data(agent_type)

        if not data:
            raise ValueError(f"No valid data found for agent type: {agent_type}")

        # Validate and clean data
        valid_data = []
        for sample in data:
            if self._validate_sample(sample):
                formatted = self._format_conversation(sample)
                valid_data.append(formatted)

        if not valid_data:
            raise ValueError(
                f"No valid data found after processing for agent type: {agent_type}"
            )

        # Remove duplicates
        unique_data = self._remove_duplicates(valid_data)

        # Split dataset
        train_data, val_data, test_data = self._split_dataset(
            unique_data, train_ratio, val_ratio, test_ratio
        )

        # Save datasets
        self.output_dir.mkdir(parents=True, exist_ok=True)
        self._save_jsonl(train_data, self.output_dir / f"{agent_type}_train.jsonl")
        self._save_jsonl(val_data, self.output_dir / f"{agent_type}_val.jsonl")
        self._save_jsonl(test_data, self.output_dir / f"{agent_type}_test.jsonl")

        # Save statistics
        stats = self._calculate_stats(unique_data)
        self._save_stats(stats, self.output_dir / f"{agent_type}_stats.json")

        logger.info(
            f"Processed {agent_type}: {len(train_data)} train, {len(val_data)} val, {len(test_data)} test samples"
        )

    def _convert_to_training_format(
        self, data: List[Dict], agent_type: str
    ) -> List[Dict]:
        """Convert to format suitable for training."""
        training_data = []

        for item in data:
            # Create conversation format suitable for language modeling
            conversation = {
                "messages": [
                    {
                        "role": "system",
                        "content": f"You are a {agent_type.replace('_', ' ')} specialist. "
                        f"Provide expert recommendations and analysis.",
                    },
                    {
                        "role": "user",
                        "content": f"{item['instruction']}\n\n{item['input']}",
                    },
                    {"role": "assistant", "content": item["output"]},
                ],
                "metadata": item.get("metadata", {}),
                "agent_type": agent_type,
            }
            training_data.append(conversation)

        return training_data

    def _create_splits(
        self, data: List[Dict]
    ) -> Tuple[List[Dict], List[Dict], List[Dict]]:
        """Create train/validation/test splits."""
        train_size = self.data_config["train_split"]
        val_size = self.data_config["validation_split"]
        test_size = self.data_config["test_split"]

        # Normalize splits to sum to 1
        total = train_size + val_size + test_size
        train_size /= total
        val_size /= total
        test_size /= total

        # First split: train vs (val + test)
        train_data, temp_data = train_test_split(
            data, test_size=(val_size + test_size), random_state=42, shuffle=True
        )

        # Second split: val vs test
        val_ratio = val_size / (val_size + test_size)
        val_data, test_data = train_test_split(
            temp_data, test_size=(1 - val_ratio), random_state=42, shuffle=True
        )

        return train_data, val_data, test_data

    def _save_datasets(
        self,
        train_data: List[Dict],
        val_data: List[Dict],
        test_data: List[Dict],
        output_dir: Path,
        agent_type: str,
    ) -> None:
        """Save processed datasets to files."""
        datasets = {"train": train_data, "validation": val_data, "test": test_data}

        for split_name, split_data in datasets.items():
            output_file = output_dir / f"{agent_type}_{split_name}.jsonl"

            with open(output_file, "w", encoding="utf-8") as f:
                for item in split_data:
                    f.write(json.dumps(item, ensure_ascii=False) + "\n")

            logger.info(f"Saved {len(split_data)} samples to {output_file}")

    def create_combined_dataset(self, output_dir: str = "/Volumes/Mango_MAS/data/processed") -> None:
        """Create combined dataset with all agent types for multi-task training."""
        output_path = Path(output_dir)

        # Collect all processed data
        all_train_data = []
        all_val_data = []
        all_test_data = []

        for agent_type in self.agents_config.keys():
            for split in ["train", "validation", "test"]:
                file_path = output_path / f"{agent_type}_{split}.jsonl"
                if file_path.exists():
                    data = self._load_jsonl(file_path)

                    if split == "train":
                        all_train_data.extend(data)
                    elif split == "validation":
                        all_val_data.extend(data)
                    else:
                        all_test_data.extend(data)

        # Shuffle combined datasets
        import random

        random.seed(42)
        random.shuffle(all_train_data)
        random.shuffle(all_val_data)
        random.shuffle(all_test_data)

        # Save combined datasets
        combined_datasets = {
            "train": all_train_data,
            "validation": all_val_data,
            "test": all_test_data,
        }

        for split_name, split_data in combined_datasets.items():
            output_file = output_path / f"combined_{split_name}.jsonl"

            with open(output_file, "w", encoding="utf-8") as f:
                for item in split_data:
                    f.write(json.dumps(item, ensure_ascii=False) + "\n")

            logger.info(
                f"Saved combined {split_name} dataset: {len(split_data)} samples"
            )

    def generate_statistics(self, output_dir: str = "/Volumes/Mango_MAS/data/processed") -> Dict:
        """Generate statistics about the processed datasets."""
        output_path = Path(output_dir)
        stats = {}

        for agent_type in list(self.agents_config.keys()) + ["combined"]:
            agent_stats = {}

            for split in ["train", "validation", "test"]:
                file_path = output_path / f"{agent_type}_{split}.jsonl"

                if file_path.exists():
                    data = self._load_jsonl(file_path)

                    # Calculate statistics
                    lengths = []
                    for item in data:
                        if "messages" in item:
                            # Calculate total text length
                            total_length = sum(
                                len(msg["content"]) for msg in item["messages"]
                            )
                            lengths.append(total_length)

                    agent_stats[split] = {
                        "count": len(data),
                        "avg_length": sum(lengths) / len(lengths) if lengths else 0,
                        "min_length": min(lengths) if lengths else 0,
                        "max_length": max(lengths) if lengths else 0,
                    }

            stats[agent_type] = agent_stats

        # Save statistics
        stats_file = output_path / "dataset_statistics.json"
        with open(stats_file, "w") as f:
            json.dump(stats, f, indent=2)

        logger.info(f"Generated dataset statistics: {stats_file}")
        return stats


def main():
    parser = argparse.ArgumentParser(
        description="Process MangoMAS datasets for local training"
    )
    parser.add_argument(
        "--input_dir",
        type=str,
        default="/Users/iancruickshank/Documents/Model/mangomas-datasets/agents/",
        help="Directory containing original JSONL files",
    )
    parser.add_argument(
        "--output_dir",
        type=str,
        default="/Volumes/Mango_MAS/data/processed",
        help="Directory to save processed datasets",
    )
    parser.add_argument(
        "--config",
        type=str,
        default="config/training/distillation.yaml",
        help="Path to configuration file",
    )
    parser.add_argument(
        "--create_combined",
        action="store_true",
        help="Create combined multi-agent dataset",
    )

    args = parser.parse_args()

    # Initialize processor
    processor = MangoMASDataProcessor(args.config)

    # Process datasets
    processor.process_datasets(args.input_dir, args.output_dir)

    # Create combined dataset if requested
    if args.create_combined:
        processor.create_combined_dataset(args.output_dir)

    # Generate statistics
    stats = processor.generate_statistics(args.output_dir)

    print("\nDataset Statistics:")
    print("=" * 50)
    for agent_type, agent_stats in stats.items():
        print(f"\n{agent_type.upper()}:")
        for split, split_stats in agent_stats.items():
            print(
                f"  {split}: {split_stats['count']} samples, "
                f"avg length: {split_stats['avg_length']:.0f} chars"
            )


if __name__ == "__main__":
    main()