"""
Summarize all GotPsi datasets from parquet files.

Generates a comprehensive summary report of all processed datasets including:
- Record counts
- Distinct user counts
- Experiment-specific metrics
- Audit information (if available)
"""

import sys
from pathlib import Path
from datetime import datetime
import pyarrow.parquet as pq
import pyarrow.compute as pc
from typing import Dict, Any, Optional
import json


# Dataset configurations with their specific characteristics
DATASETS = {
    'users': {
        'file': 'users.parquet',
        'description': 'User Survey Responses',
        'key_fields': ['user_id'],
        'metrics': ['total_users', 'has_demographics'],
    },
    'card': {
        'file': 'card_cleaned.parquet',
        'description': 'Basic Card Test (ESP 1-in-5)',
        'key_fields': ['user_id', 'trial_number', 'target2', 'response'],
        'metrics': ['total_trials', 'unique_users', 'conditions', 'hit_rate'],
    },
    'cardd': {
        'file': 'cardD_cleaned.parquet',
        'description': 'Card Test with Details',
        'key_fields': ['user_id', 'trial_number', 'target2', 'response'],
        'metrics': ['total_trials', 'unique_users', 'conditions', 'hit_rate'],
    },
    'cards': {
        'file': 'cardS_cleaned.parquet',
        'description': 'Card Test Shuffled',
        'key_fields': ['user_id', 'trial_number', 'target2', 'response'],
        'metrics': ['total_trials', 'unique_users', 'conditions', 'hit_rate'],
    },
    'rv': {
        'file': 'rv_cleaned.parquet',
        'description': 'Full Remote Viewing',
        'key_fields': ['user_id', 'target', 'response'],
        'metrics': ['total_sessions', 'unique_users', 'targets', 'response_rate'],
    },
    'rvq': {
        'file': 'rvq_cleaned.parquet',
        'description': 'Quick Remote Viewing',
        'key_fields': ['user_id', 'target', 'response'],
        'metrics': ['total_sessions', 'unique_users', 'targets', 'response_rate'],
    },
    'location': {
        'file': 'location_cleaned.parquet',
        'description': 'Remote Viewing Coordinates',
        'key_fields': ['user_id', 'latitude', 'longitude'],
        'metrics': ['total_locations', 'unique_users', 'has_coordinates'],
    },
    'lottery': {
        'file': 'lottery_cleaned.parquet',
        'description': 'Lottery Data',
        'key_fields': ['user_id'],
        'metrics': ['total_entries', 'unique_users'],
    },
}


def get_parquet_summary(file_path: Path) -> Dict[str, Any]:
    """Get summary statistics from a parquet file using metadata and efficient operations."""
    try:
        # Read parquet metadata
        parquet_file = pq.ParquetFile(file_path)
        metadata = parquet_file.metadata
        schema = parquet_file.schema_arrow

        # Basic stats from metadata
        num_rows = metadata.num_rows
        num_columns = metadata.num_columns

        # Column information
        columns = schema.names

        # Check for audit columns
        has_audit = 'source_file' in columns and 'source_row_number' in columns

        # Read only needed columns for distinct counts (more efficient than reading all data)
        table = pq.read_table(file_path, columns=columns)

        # Get distinct user count if user_id exists
        distinct_users = None
        if 'user_id' in columns:
            user_column = table.column('user_id')
            distinct_users = pc.count_distinct(user_column).as_py()

        # Get distinct source files if audit columns exist
        distinct_files = None
        if has_audit:
            file_column = table.column('source_file')
            distinct_files = pc.count_distinct(file_column).as_py()

        return {
            'num_rows': num_rows,
            'num_columns': num_columns,
            'columns': columns,
            'has_audit': has_audit,
            'distinct_users': distinct_users,
            'distinct_files': distinct_files,
            'file_size_mb': file_path.stat().st_size / (1024 * 1024),
        }

    except Exception as e:
        return {'error': str(e)}


def calculate_dataset_metrics(dataset_name: str, summary: Dict[str, Any]) -> Dict[str, Any]:
    """Calculate experiment-specific metrics for a dataset."""
    metrics = {}

    if 'error' in summary:
        return metrics

    # Common metrics
    metrics['records'] = summary['num_rows']

    if summary['distinct_users']:
        metrics['unique_users'] = summary['distinct_users']

    # Card-based experiments (card, cardD, cardS)
    if dataset_name in ['card', 'cardd', 'cards']:
        metrics['experiment_type'] = 'ESP Card Test (1-in-5 chance)'
        metrics['expected_hit_rate'] = '20%'
        # Could calculate actual hit rate by reading target2 and response columns

    # RV experiments (rv, rvq)
    elif dataset_name in ['rv', 'rvq']:
        metrics['experiment_type'] = 'Remote Viewing'
        if dataset_name == 'rv':
            metrics['format'] = 'Full RV session'
        else:
            metrics['format'] = 'Quick RV session'

    # Location
    elif dataset_name == 'location':
        metrics['experiment_type'] = 'Remote Viewing Coordinates'
        metrics['data_type'] = 'Geographic coordinates'

    # Users
    elif dataset_name == 'users':
        metrics['experiment_type'] = 'Survey Responses'
        metrics['data_type'] = 'User demographics and survey answers'

    # Lottery
    elif dataset_name == 'lottery':
        metrics['experiment_type'] = 'Lottery Predictions'

    # Audit information
    if summary['has_audit'] and summary['distinct_files']:
        metrics['source_files_processed'] = summary['distinct_files']

    return metrics


def format_number(num: int) -> str:
    """Format large numbers with commas."""
    return f"{num:,}"


def print_summary_report(results: Dict[str, Any], output_format: str = 'text'):
    """Print formatted summary report."""

    if output_format == 'json':
        print(json.dumps(results, indent=2))
        return

    # Text format
    print("=" * 80)
    print("GotPsi Datasets Summary Report")
    print("=" * 80)
    print(f"\nGenerated: {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}")
    print()

    total_records = 0
    total_size_mb = 0
    datasets_processed = 0
    datasets_with_audit = 0

    for dataset_name, config in DATASETS.items():
        result = results.get(dataset_name, {})

        if 'error' in result:
            print(f"\n{config['description']} ({dataset_name})")
            print("-" * 80)
            print(f"  Status: NOT FOUND or ERROR - {result['error']}")
            continue

        summary = result['summary']
        metrics = result['metrics']

        datasets_processed += 1
        total_records += summary['num_rows']
        total_size_mb += summary['file_size_mb']

        if summary['has_audit']:
            datasets_with_audit += 1

        print(f"\n{config['description']} ({dataset_name})")
        print("-" * 80)
        print(f"  Records:          {format_number(summary['num_rows'])}")

        if summary['distinct_users']:
            print(f"  Unique Users:     {format_number(summary['distinct_users'])}")

        print(f"  Columns:          {summary['num_columns']}")
        print(f"  File Size:        {summary['file_size_mb']:.2f} MB")

        if metrics.get('experiment_type'):
            print(f"  Experiment Type:  {metrics['experiment_type']}")

        if metrics.get('expected_hit_rate'):
            print(f"  Expected Rate:    {metrics['expected_hit_rate']}")

        if summary['has_audit'] and summary['distinct_files']:
            print(f"  Source Files:     {format_number(summary['distinct_files'])} distinct files processed")
            print(f"  Audit Tracking:   ENABLED")
        else:
            print(f"  Audit Tracking:   DISABLED")

    # Overall summary
    print("\n" + "=" * 80)
    print("Overall Summary")
    print("=" * 80)
    print(f"  Total Datasets:      {datasets_processed}")
    print(f"  Total Records:       {format_number(total_records)}")
    print(f"  Total Size:          {total_size_mb:.2f} MB")
    print(f"  Datasets with Audit: {datasets_with_audit}")
    print()


def main():
    import argparse

    parser = argparse.ArgumentParser(
        description='Summarize all GotPsi datasets',
        formatter_class=argparse.RawDescriptionHelpFormatter,
    )
    parser.add_argument('--output-dir', type=Path, default=Path('output/parquet'),
                       help='Directory containing parquet files (default: output/parquet)')
    parser.add_argument('--format', choices=['text', 'json'], default='text',
                       help='Output format (default: text)')
    parser.add_argument('--output-file', type=Path,
                       help='Write report to file instead of stdout')

    args = parser.parse_args()

    # Check if output directory exists
    if not args.output_dir.exists():
        print(f"Error: Output directory not found: {args.output_dir}", file=sys.stderr)
        sys.exit(1)

    # Process each dataset
    results = {}

    for dataset_name, config in DATASETS.items():
        file_path = args.output_dir / config['file']

        if not file_path.exists():
            results[dataset_name] = {'error': f'File not found: {file_path}'}
            continue

        summary = get_parquet_summary(file_path)
        metrics = calculate_dataset_metrics(dataset_name, summary)

        results[dataset_name] = {
            'summary': summary,
            'metrics': metrics,
        }

    # Output results
    if args.output_file:
        import sys
        original_stdout = sys.stdout
        with open(args.output_file, 'w') as f:
            sys.stdout = f
            print_summary_report(results, args.format)
            sys.stdout = original_stdout
        print(f"Report written to: {args.output_file}")
    else:
        print_summary_report(results, args.format)


if __name__ == '__main__':
    main()