from types import MappingProxyType
from typing import Mapping

from mini_db_mcp.domain.domain_handler import ToolHandler
from mini_db_mcp.domain.runtime.query_runtime import QueryRuntime


class QueryHandler:
    domain_name = "query"

    def __init__(self, runtime: QueryRuntime) -> None:
        self._handlers: Mapping[str, ToolHandler] = MappingProxyType(
            {"execute_query": runtime.execute_query}
        )

    @property
    def handler_names(self) -> frozenset[str]:
        return frozenset(self._handlers)

    def resolve_handler(self, name: str) -> ToolHandler | None:
        return self._handlers.get(name)