#!/usr/bin/env python3
"""
Adds 'using StellaOps.TestKit;' to files that use TestCategories but are missing the import.
"""

import re
import sys
from pathlib import Path


def fix_file(file_path: Path, dry_run: bool = False) -> bool:
    """Add using StellaOps.TestKit; to files that need it."""
    try:
        content = file_path.read_text(encoding='utf-8-sig')
    except Exception as e:
        print(f"  Error reading {file_path}: {e}", file=sys.stderr)
        return False

    # Check if file uses TestCategories
    if 'TestCategories.' not in content:
        return False

    # Check if 'using StellaOps.TestKit;' exists anywhere in the file
    if 'using StellaOps.TestKit;' in content:
        return False

    # Find the namespace declaration
    namespace_match = re.search(r'^namespace\s+[\w.]+', content, re.MULTILINE)
    if not namespace_match:
        print(f"  No namespace found in {file_path}", file=sys.stderr)
        return False

    # Find the last 'using' statement before the namespace
    top_section = content[:namespace_match.start()]
    last_using = None
    for match in re.finditer(r'^using [^;]+;\s*$', top_section, re.MULTILINE):
        last_using = match

    if last_using:
        insert_pos = last_using.end()
        fixed = content[:insert_pos] + '\nusing StellaOps.TestKit;' + content[insert_pos:]
    else:
        # No using statements, add at the beginning
        fixed = 'using StellaOps.TestKit;\n' + content

    if not dry_run:
        encoding = 'utf-8-sig' if content.startswith('\ufeff') else 'utf-8'
        file_path.write_text(fixed, encoding=encoding)

    return True


def main():
    import argparse
    parser = argparse.ArgumentParser(description='Add missing using StellaOps.TestKit statements')
    parser.add_argument('--path', default='src', help='Path to scan')
    parser.add_argument('--dry-run', action='store_true', help='Show what would be fixed')
    args = parser.parse_args()

    root = Path(args.path)
    fixed_count = 0
    checked_count = 0

    for file_path in root.rglob('*.cs'):
        if '/obj/' in str(file_path) or '/bin/' in str(file_path):
            continue
        if 'node_modules' in str(file_path):
            continue
        if 'Test' not in str(file_path):
            continue

        checked_count += 1
        if fix_file(file_path, dry_run=args.dry_run):
            print(f"{'Would add' if args.dry_run else 'Added'} using to: {file_path}")
            fixed_count += 1

    print(f"\nChecked: {checked_count} files")
    print(f"Fixed: {fixed_count} files")


if __name__ == '__main__':
    main()