"""Standalone post-processing: derive dead objects from schema-data.json + audit-data.json."""

import argparse
import json
import os
import sys

from src.config import GRAPH_ID
from src.report import find_dead_objects


def main() -> None:
    parser = argparse.ArgumentParser(description='Detect dead objects from existing audit and schema data.')
    parser.add_argument('--schema-data', default=os.path.join(os.path.dirname(__file__), '..', 'schema-data.json'), help='Path to schema-data.json')
    parser.add_argument('--audit-data', default=os.path.join(os.path.dirname(__file__), '..', 'audit-data.json'), help='Path to audit-data.json')
    parser.add_argument('--graph-id', default=GRAPH_ID, help=f'Graph ID (default: {GRAPH_ID})')
    args = parser.parse_args()

    schema_path = os.path.abspath(args.schema_data)
    audit_path = os.path.abspath(args.audit_data)

    for path, label in [(schema_path, 'schema-data.json'), (audit_path, 'audit-data.json')]:
        if not os.path.exists(path):
            print(f'Error: {label} not found at {path}', file=sys.stderr)
            sys.exit(1)

    with open(schema_path) as fp:
        schema = json.load(fp)
    with open(audit_path) as fp:
        audit = json.load(fp)

    all_objects = schema['all_objects']
    dead_object_fields = audit['dead_object_fields']

    dead_objects = find_dead_objects(all_objects, dead_object_fields, args.graph_id)

    # Update audit-data.json in place
    audit['dead_objects'] = dead_objects
    if 'objects' not in audit.get('summary', {}):
        audit.setdefault('summary', {})['objects'] = {'dead': len(dead_objects), 'total': len(all_objects)}
    else:
        audit['summary']['objects'] = {'dead': len(dead_objects), 'total': len(all_objects)}

    with open(audit_path, 'w') as fp:
        json.dump(audit, fp, indent=2)

    print(f'Dead objects: {len(dead_objects)} / {len(all_objects)}')
    print(f'Updated {audit_path}')


if __name__ == '__main__':
    main()