from typing import Optional

from server.constants.playlists.v0.misc import ELASTICSEARCH_ESCAPING_CHARACTERS


def escape_elastic_query(query: Optional[str]) -> Optional[str]:
    """Fix elastic query special symbols.

    Args:
        query: Search query.

    Returns:
        Escaped query.

    """
    if not query:
        return query

    escaped_query = ""
    for char in query.lower().strip():
        escaped_query += f"\\{char}" if char in ELASTICSEARCH_ESCAPING_CHARACTERS else char
    return escaped_query