from __future__ import annotations

from typing import Any


def _match_condition(cond: dict[str, Any], slots: dict[str, str]) -> bool:
    ctype = cond.get("type")
    if ctype == "always":
        return True
    slot = str(cond.get("slot") or "")
    value = str(cond.get("value") or "")
    actual = (slots.get(slot) or "").strip()
    if ctype == "slot_equals":
        return actual == value
    if ctype == "slot_contains":
        return value.lower() in actual.lower()
    return False


def evaluate_tree(rules: list[dict[str, Any]], slots: dict[str, str]) -> dict[str, Any]:
    for rule in rules:
        conditions = rule.get("when_all") or []
        if all(_match_condition(c, slots) for c in conditions):
            then = dict(rule.get("then") or {})
            return {
                "rule_id": rule.get("id"),
                "description": rule.get("description"),
                **then,
            }
    return {
        "rule_id": "empty",
        "product_bundle": ["待专家确认"],
        "tech_line": "待判定",
        "summary": "未匹配到规则",
        "confidence": 0.0,
        "handoff": True,
    }