from __future__ import annotations

from dataclasses import asdict, dataclass
import re
from typing import Any


ACCOUNT_TOKEN_RE = re.compile(r"\b\d{2}(?:\.\d{2})?\b")


@dataclass
class RouteDecisionFlags:
    needs_exact_object_trace: bool
    needs_causal_chain: bool
    needs_cross_entity_join: bool
    needs_full_period_aggregation: bool
    needs_ranking: bool
    needs_anomaly_summary: bool
    needs_runtime_truth: bool
    freshness_sensitive: bool
    ambiguous_object_scope: bool
    store_sufficiency_confident: bool
    precomputed_aggregate_available: bool

    def to_dict(self) -> dict[str, Any]:
        return asdict(self)


def _norm(text: str) -> str:
    return text.lower().strip()


def _contains_any(text: str, tokens: list[str]) -> bool:
    return any(token in text for token in tokens)


def _has_account_token(text: str) -> bool:
    return bool(ACCOUNT_TOKEN_RE.search(text))


def _has_iso_date(text: str) -> bool:
    return bool(re.search(r'\b\d{4}-\d{2}-\d{2}\b', text))


def _aggregate_available_for_shape(
    *,
    available: set[str],
    needs_ranking: bool,
    needs_anomaly_summary: bool,
    needs_full_period_aggregation: bool,
    text: str,
) -> bool:
    if needs_ranking:
        ranking_tokens = {
            "risk_account_ranking",
            "risk_counterparty_ranking",
            "risk_ranking",
        }
        return bool(available.intersection(ranking_tokens))

    if needs_anomaly_summary:
        anomaly_tokens = {
            "company_anomaly_summary",
        }
        return bool(available.intersection(anomaly_tokens))

    if needs_full_period_aggregation:
        if "baseline" in text:
            return "baseline_period_summary" in available
        return "full_period_aggregation" in available

    return False


def classify_query_for_route(
    question_text: str,
    parsed_intent: dict[str, Any],
    store_metadata: dict[str, Any],
) -> RouteDecisionFlags:
    text = _norm(question_text)
    question_class = str(parsed_intent.get("question_class", "")).strip().lower()

    exact_markers = [
        "document by number",
        "source-of-record",
        "source",
        "chain",
        "why",
        "subconto3",
        "supplier",
        "поставщик",
        "buyer",
        "покупатель",
        "purchase",
        "закуп",
        "document",
        "документ",
        "date",
        "дата",
    ]
    inventory_markers = [
        "склад",
        "остаток",
        "поставщик",
        "закуплен",
        "куплен",
        "продан",
        "inventory",
        "stock",
        "supplier",
        "purchase",
        "sale",
    ]
    causal_markers = [
        "свяжи",
        "цепочка",
        "через",
        "объясни",
        "почему",
        "источник",
        "регистр",
        "первич",
    ]
    cross_markers = [
        "свяжи",
        "документ",
        "провод",
        "контрагент",
        "договор",
        "регистр",
    ]
    ranking_markers = ["рейтинг", "ranking", "топ", "top"]
    anomaly_markers = ["аномал", "summary", "срез", "risk-slice", "риск-срез"]

    needs_exact_object_trace = _contains_any(text, exact_markers) and (
        question_class in {"drilldown_explain", "simple_factual", "cross_entity"}
    )
    if _contains_any(text, inventory_markers) and question_class in {
        "drilldown_explain",
        "simple_factual",
        "cross_entity",
    }:
        needs_exact_object_trace = True
    if question_class in {"drilldown_explain", "simple_factual", "cross_entity"} and (
        ("41" in text and _contains_any(text, ["остаток", "balance", "stock"]))
        or (
            _contains_any(text, ["supplier", "поставщик", "buyer", "покупатель"])
            and _contains_any(text, ["purchase", "закуп", "document", "документ"])
        )
    ):
        needs_exact_object_trace = True
    if question_class == "simple_factual" and "document by number" in text:
        needs_exact_object_trace = True

    if question_class == "unknown" and "41" in text and _has_iso_date(text):
        needs_exact_object_trace = True

    needs_causal_chain = _contains_any(text, causal_markers) and question_class in {
        "drilldown_explain",
        "cross_entity",
    }
    if _contains_any(text, inventory_markers) and "???????" in text:
        needs_causal_chain = True
    needs_cross_entity_join = (
        question_class == "cross_entity"
        or (_contains_any(text, cross_markers) and " ? " in text and "->" not in text)
    )

    needs_ranking = _contains_any(text, ranking_markers) and question_class in {
        "heavy_analytical",
        "period_trend",
        "anomaly_control",
    }
    needs_anomaly_summary = _contains_any(text, anomaly_markers)
    is_heavy = question_class == "heavy_analytical"
    is_baseline_heavy = is_heavy and "baseline" in text
    needs_full_period_aggregation = is_heavy and not is_baseline_heavy

    needs_runtime_truth = needs_exact_object_trace or _contains_any(
        text, ["runtime", "source-of-record", "???????????????? ????????????????"]
    )
    freshness_sensitive = question_class in {
        "period_trend",
        "anomaly_control",
        "heavy_analytical",
    }
    ambiguous_object_scope = question_class == "ambiguous_fuzzy"
    if ambiguous_object_scope and _has_account_token(text):
        needs_runtime_truth = True

    available_aggregates = {
        str(item).strip().lower() for item in store_metadata.get("precomputed_aggregates", [])
    }
    precomputed_aggregate_available = _aggregate_available_for_shape(
        available=available_aggregates,
        needs_ranking=needs_ranking,
        needs_anomaly_summary=needs_anomaly_summary,
        needs_full_period_aggregation=needs_full_period_aggregation,
        text=text,
    )

    store_sufficiency_confident = (
        question_class == "simple_factual"
        and not needs_runtime_truth
        and not needs_causal_chain
        and not needs_cross_entity_join
    )

    return RouteDecisionFlags(
        needs_exact_object_trace=needs_exact_object_trace,
        needs_causal_chain=needs_causal_chain,
        needs_cross_entity_join=needs_cross_entity_join,
        needs_full_period_aggregation=needs_full_period_aggregation,
        needs_ranking=needs_ranking,
        needs_anomaly_summary=needs_anomaly_summary,
        needs_runtime_truth=needs_runtime_truth,
        freshness_sensitive=freshness_sensitive,
        ambiguous_object_scope=ambiguous_object_scope,
        store_sufficiency_confident=store_sufficiency_confident,
        precomputed_aggregate_available=precomputed_aggregate_available,
    )