from __future__ import annotations

import re

_RELATIONSHIP_MARKERS = ("上游", "下游", "依赖", "关联", "经过", "血缘")
_GLOBAL_MARKERS = ("整体", "主要主题", "跨域", "总结")
_EXACT_PATTERN = re.compile(r"[\"'“”‘’`]|\b[a-zA-Z][a-zA-Z0-9_.$-]{2,}\b")


def route_query(query: str) -> str:
    normalized = query.strip()
    if any(marker in normalized for marker in _RELATIONSHIP_MARKERS):
        return "relationship"
    if any(marker in normalized for marker in _GLOBAL_MARKERS):
        return "global"
    if _EXACT_PATTERN.search(normalized):
        return "exact"
    return "semantic"