"""Deterministic request classifier: light operational, substantial, or strategic."""
from __future__ import annotations

from typing import Any

from .coverage_model import tokens

STRATEGIC = {
    "strategy", "portfolio", "pricing", "budget", "roadmap", "acquisition", "partnership",
    "compliance", "legal", "production", "customer", "revenue", "one-way", "irreversible",
    "전략", "포트폴리오", "가격", "예산", "로드맵", "인수", "법무", "규제", "매출", "고객",
}
LIGHT = {
    "typo", "spelling", "docs", "comment", "rename", "format", "config", "test", "small",
    "오탈자", "문서", "주석", "이름", "포맷", "설정", "테스트", "작은",
}
SUBSTANTIAL = {
    "feature", "refactor", "migration", "architecture", "api", "database", "security", "design",
    "기능", "리팩터", "마이그레이션", "아키텍처", "데이터베이스", "보안", "설계",
}


def classify_request(request: str, facts: dict[str, Any] | None = None) -> dict[str, Any]:
    facts = facts or {}
    observed = tokens(request) | tokens(facts)
    searchable = (request + " " + str(facts)).lower()
    strategic_hits = sorted({term for term in STRATEGIC if term in observed or term in searchable})
    substantial_hits = sorted({term for term in SUBSTANTIAL if term in observed or term in searchable})
    light_hits = sorted({term for term in LIGHT if term in observed or term in searchable})
    if facts.get("one-way-door") or facts.get("blast-radius") == "production-customer-revenue" or strategic_hits:
        route = "strategic"
        plan = "cascade"
        executive = True
    elif substantial_hits or facts.get("cross-team"):
        route = "substantial"
        plan = "cascade"
        executive = False
    else:
        route = "light-operational"
        plan = "light"
        executive = False
    return {
        "classification": route,
        "plan": plan,
        "executive-required": executive,
        "signals": {
            "strategic": strategic_hits,
            "substantial": substantial_hits,
            "light": light_hits,
        },
        "reason": (
            "decision authority or high-blast signal" if executive else
            "substantial implementation/design signal" if route == "substantial" else
            "reversible owner-scoped task"
        ),
    }