import json
import threading


RETIRED_MESSAGE = 'Legacy ScanManager mutation controls are retired; use the authenticated supervisor.'


class ScanManager:
    """Read-only compatibility shell for the retired legacy scanner UI."""

    def __init__(self):
        self.current_scan = None
        self.scan_thread = None
        self.results = []
        self.progress = {
            'total': 0,
            'completed': 0,
            'failed': 0,
            'secrets_found': 0,
            'current_target': None,
            'status': 'retired',
        }
        self.scan_lock = threading.Lock()
        self.scanned_targets = set()
        self.scan_history = []

    def start_scan(self, scan_type, targets, scan_options):
        return False, RETIRED_MESSAGE

    def pause_scan(self):
        return False

    def resume_scan(self):
        return False

    def stop_scan(self):
        return False

    def is_scanning(self):
        return False

    def get_progress(self):
        with self.scan_lock:
            return self.progress.copy()

    def get_results(self):
        with self.scan_lock:
            return self.results.copy()

    def clear_results(self):
        return False

    def get_scan_info(self):
        with self.scan_lock:
            return self.current_scan.copy() if self.current_scan else None

    def export_results(self, format='json'):
        with self.scan_lock:
            if str(format).lower() == 'json':
                return json.dumps(self.results, indent=2, default=str)
            return None

    def clear_scan_history(self):
        return False

    def get_scan_history(self):
        with self.scan_lock:
            return self.scan_history.copy()

    def get_scanned_targets_count(self):
        return len(self.scanned_targets)