"""Database backup/check/list and explicitly offline restore; no app initialization."""

import argparse
import json
from pathlib import Path
import sqlite3
import sys

ROOT = Path(__file__).resolve().parents[1]
if str(ROOT) not in sys.path:
    sys.path.insert(0, str(ROOT))

from logistics_chat.database_backup import (check_database, daily_backup, restore_database,
                                           snapshot_database, unique_backup_path)


def main(argv=None):
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument('--db', type=Path, default=ROOT/'history.db')
    parser.add_argument('--backup-dir', type=Path, default=None)
    parser.add_argument('command', choices=('backup', 'daily', 'list', 'check', 'restore'))
    parser.add_argument('--input', type=Path)
    parser.add_argument('--service-stopped', action='store_true', help='Confirm all database users are stopped before restore')
    args = parser.parse_args(argv)
    database = args.db.resolve()
    directory = (args.backup_dir or database.parent/'backups').resolve()
    try:
        if args.command == 'backup':
            path = snapshot_database(database, unique_backup_path(directory, 'manual'))
            print('Backup: ' + str(path))
        elif args.command == 'daily':
            print('Backup: ' + str(daily_backup(database, directory)))
        elif args.command == 'list':
            for path in sorted(directory.glob('*.db'), reverse=True):
                print(json.dumps({'file':str(path), 'bytes':path.stat().st_size}, ensure_ascii=False))
        elif args.command == 'check':
            print(check_database(args.input or database))
        elif args.command == 'restore':
            if not args.service_stopped:
                parser.error('Restore requires --service-stopped; stop the app and all database users first')
            if args.input is None:
                parser.error('Restore requires --input')
            safety = restore_database(database, args.input, directory)
            print('Restored: ' + str(database))
            if safety:
                print('Safety backup: ' + str(safety))
    except (OSError, ValueError, RuntimeError, sqlite3.Error) as error:
        print('Database operation failed: ' + str(error), file=sys.stderr)
        return 1
    return 0


if __name__ == '__main__':
    raise SystemExit(main())