#!/usr/bin/env -S uv run
# /// script
# requires-python = ">=3.10"
# dependencies = [
#     "datasets",
#     "huggingface_hub",
# ]
# ///
"""
Extract unique MCP client combinations (name, version, capabilities) from evalstate/hf-mcp-logs dataset.
Only processes "initialize" method calls - ignores "session_delete" events which lack complete client information.
Tracks most recent "last seen" timestamp for each unique client configuration.
Uses batched streaming for efficient I/O on large datasets (~7M rows).

Usage:
    # Process all data and save to local file
    python3.10 extract_mcp_clients.py -o clients.ndjson

    # Push to Hugging Face Hub (creates/updates evalstate/mcp-clients dataset)
    python3.10 extract_mcp_clients.py --push-to-hub

    # Push to a specific split (for scheduled pipelines)
    python3.10 extract_mcp_clients.py --push-to-hub --split raw

    # Process a sample for testing
    python3.10 extract_mcp_clients.py --limit 10000 -o sample.ndjson

Output fields:
    - name: MCP client name (e.g., "Cursor", "Anthropic/ClaudeAI", "chat-ui-mcp")
    - version: Client version
    - capabilities: Client capabilities (JSON object or null)
    - last_seen: Most recent timestamp when this client was seen
"""

import argparse
import json
import sys
from datetime import datetime
from pathlib import Path

from datasets import Dataset, Features, Value
from huggingface_hub import HfApi


def normalize_capabilities(caps):
    """Normalize capabilities for comparison."""
    if caps is None:
        return None
    if isinstance(caps, str):
        # Parse stringified JSON if needed
        if caps == '{}':
            return {}
        try:
            return json.loads(caps)
        except Exception:
            return caps
    return caps


def capabilities_to_string(caps):
    """Convert capabilities to JSON string for storage."""
    if caps is None:
        return ''
    if isinstance(caps, dict):
        return json.dumps(caps, sort_keys=True)
    return str(caps)


def create_dataset_from_clients(clients_list, features=None):
    """Create a Hugging Face Dataset from the clients list."""
    if features is None:
        features = Features({
            'name': Value('string'),
            'version': Value('string'),
            'capabilities': Value('string'),  # Store as JSON string for consistency
            'last_seen': Value('string'),
        })

    # Convert to records format for Dataset
    records = []
    for client in clients_list:
        record = {
            'name': client['name'],
            'version': client['version'],
            'capabilities': capabilities_to_string(client['capabilities']),
            'last_seen': client['last_seen'],
        }
        records.append(record)

    return Dataset.from_list(records, features=features)


def push_to_hub(clients_list, repo_id, split=None, token=None, private=False):
    """Push the clients dataset to Hugging Face Hub."""
    # Create dataset from clients
    dataset = create_dataset_from_clients(clients_list)

    # Determine split for push
    if split:
        print(f"Pushing dataset to https://huggingface.co/datasets/{repo_id} (config: raw, split: {split})", file=sys.stderr)
    else:
        print(f"Pushing dataset to https://huggingface.co/datasets/{repo_id} (config: raw)", file=sys.stderr)

    # Push to hub with explicit config_name to avoid creating "default" config
    # This ensures the data goes to the "raw" config, not a "default" config
    dataset.push_to_hub(
        repo_id=repo_id,
        config_name="raw",  # Explicitly set config name to avoid "default" config creation
        split=split,
        token=token,
        private=private,
        commit_message=f"Update MCP clients dataset ({datetime.now().strftime('%Y-%m-%d %H:%M')})",
    )
    print(f"Successfully pushed {len(clients_list):,} clients to {repo_id}", file=sys.stderr)


def main():
    parser = argparse.ArgumentParser(
        description="Extract unique MCP clients with last seen timestamp from evalstate/hf-mcp-logs",
        formatter_class=argparse.RawDescriptionHelpFormatter,
        epilog="""
Examples:
  # Process all data and save to local file
  %(prog)s -o clients.ndjson

  # Push to Hugging Face Hub (requires authentication: `hf auth login`)
  %(prog)s --push-to-hub

  # Push to a specific split (ideal for scheduled jobs/pipelines)
  %(prog)s --push-to-hub --split raw

  # Process with limit (for testing)
  %(prog)s --limit 10000 -o sample.ndjson

  # Push to a private repo
  %(prog)s --push-to-hub --private
        """
    )
    parser.add_argument("-o", "--output", help="Output file path (default: stdout)")
    parser.add_argument("--limit", type=int,
                        help="Limit processing to N rows (useful for testing)")
    parser.add_argument("--format", choices=["ndjson", "csv"], default="ndjson",
                        help="Output format (default: ndjson)")
    parser.add_argument("--batch-size", type=int, default=1000,
                        help="Batch size for streaming (default: 1000). Larger values may "
                             "improve I/O efficiency but use more memory.")
    parser.add_argument("--push-to-hub", action="store_true",
                        help="Push the resulting dataset to Hugging Face Hub")
    parser.add_argument("--split", default=None,
                        help="Split name when pushing to Hub (e.g., 'raw' for scheduled pipelines)")
    parser.add_argument("--repo-id", default="evalstate/mcp-clients",
                        help="HF Hub repository ID (default: evalstate/mcp-clients)")
    parser.add_argument("--token", default=None,
                        help="HF token (defaults to HF_TOKEN env var or cached token)")
    parser.add_argument("--private", action="store_true",
                        help="Create/push to a private repository")
    args = parser.parse_args()

    # Dictionary to track unique (name, version, capabilities) -> data
    unique_clients = {}

    # Load dataset in streaming mode with batch processing
    print(f"Loading dataset: evalstate/hf-mcp-logs (sessions split)", file=sys.stderr)
    print(f"Using batch size: {args.batch_size}", file=sys.stderr)

    from datasets import load_dataset
    ds = load_dataset('evalstate/hf-mcp-logs', 'sessions', streaming=True)
    # Access sessions split
    sessions_ds = ds['sessions']

    total_rows = 0
    skipped_deletes = 0
    skipped_other = 0
    start_time = None

    # Process in batches for better I/O efficiency
    for batch in sessions_ds.iter(batch_size=args.batch_size):
        batch_len = len(batch['name'])  # All columns have same length
        total_rows += batch_len

        # Progress indicator every 100k rows
        if total_rows % 100000 == 0:
            if start_time is None:
                start_time = datetime.now()
            elapsed = (datetime.now() - start_time).total_seconds()
            rate = total_rows / elapsed if elapsed > 0 else 0
            print(f"Processed {total_rows:,} rows ({rate:.0f} rows/sec), "
                  f"found {len(unique_clients):,} unique clients, "
                  f"skipped {skipped_deletes:,} delete events...", file=sys.stderr)

        if args.limit and total_rows > args.limit:
            break

        # Process each row in batch
        # Batch is a dict where keys are column names and values are lists
        for i in range(batch_len):
            # Check methodName field - only process 'initialize' events
            method_name = batch['methodName'][i] if 'methodName' in batch else None
            
            # Skip session_delete events - they don't have meaningful client information
            if method_name == 'session_delete':
                skipped_deletes += 1
                continue
            
            # Only process initialize events
            if method_name != 'initialize':
                skipped_other += 1
                continue
            
            name = batch['name'][i]
            version = batch['version'][i]
            capabilities = normalize_capabilities(batch['capabilities'][i])
            time_str = batch['time'][i]

            if not all([name, version, time_str]):
                continue

            # Create composite key for deduplication
            # For capabilities, we need a hashable representation
            if isinstance(capabilities, dict):
                cap_key = json.dumps(capabilities, sort_keys=True)
            else:
                cap_key = str(capabilities) if capabilities is not None else None

            key = (name, version, cap_key)

            # Update if this entry is newer
            if key not in unique_clients or time_str > unique_clients[key]['last_seen']:
                unique_clients[key] = {
                    'name': name,
                    'version': version,
                    'capabilities': capabilities,
                    'last_seen': time_str
                }

    print(f"\nProcessing complete: {total_rows:,} rows processed", file=sys.stderr)
    print(f"Skipped {skipped_deletes:,} session_delete events", file=sys.stderr)
    if skipped_other > 0:
        print(f"Skipped {skipped_other:,} other non-initialize events", file=sys.stderr)
    print(f"Found {len(unique_clients):,} unique client configurations", file=sys.stderr)

    # Sort by last_seen descending (most recent first)
    sorted_clients = sorted(
        unique_clients.values(),
        key=lambda x: x['last_seen'],
        reverse=True
    )

    # Handle push to hub
    if args.push_to_hub:
        push_to_hub(sorted_clients, args.repo_id, split=args.split, token=args.token, private=args.private)
        return

    # Handle local output
    if args.output:
        out_file = open(args.output, 'w')
    else:
        out_file = sys.stdout

    # Output results
    if args.format == 'ndjson':
        for client in sorted_clients:
            # Ensure capabilities is output properly
            if client['capabilities'] == '{}':
                client['capabilities'] = {}

            out_file.write(json.dumps(client) + '\n')

    elif args.format == 'csv':
        # Write CSV header
        import csv
        writer = csv.writer(out_file)
        writer.writerow(['name', 'version', 'capabilities', 'last_seen'])

        for client in sorted_clients:
            # Convert capabilities to string for CSV
            caps = client['capabilities']
            if isinstance(caps, dict):
                caps_str = json.dumps(caps)
            elif caps is None:
                caps_str = ''
            else:
                caps_str = str(caps)

            writer.writerow([client['name'], client['version'], caps_str, client['last_seen']])

    if args.output:
        out_file.close()
        print(f"Output written to: {args.output}", file=sys.stderr)


if __name__ == '__main__':
    main()