"""Экстрактор пользователей на той же логике, что и поиск поставщика."""

from __future__ import annotations

import re
import importlib
from typing import Any

from extractors.supplier_extractor import ExpenseSupplierExtractor, normalize_text


class ExpenseUserExtractor:
    """Ищет пользователя тем же fuzzy-matcher, что и поставщика."""

    MIN_LEXICAL_SUPPORT = 0.40
    MIN_LEXICAL_WITH_PERSON = 0.30

    def __init__(
        self,
        users: list[str],
        suppliers: list[str],
        threshold: float = 0.25,
    ) -> None:
        self.threshold = threshold
        self.supplier_terms = {normalize_text(supplier) for supplier in suppliers}
        self.user_matcher = ExpenseSupplierExtractor(suppliers=users)
        self.morph: Any = None
        try:
            pymorphy3_module = importlib.import_module("pymorphy3")
            self.morph = pymorphy3_module.MorphAnalyzer()
        except Exception:
            self.morph = None

    def _looks_like_person_token(self, token: str) -> tuple[bool, float, bool]:
        lexical = self.user_matcher.lexical_support(token)
        has_person_grammeme = False
        if self.morph is not None:
            parses = self.morph.parse(token)
            if parses:
                has_person_grammeme = bool(
                    {"Name", "Surn", "Patr"}.intersection(set(parses[0].tag.grammemes))
                )

        # Сохраняем низкий порог для имён, но не пропускаем нарицательные слова.
        accepted = lexical >= self.MIN_LEXICAL_SUPPORT or (
            has_person_grammeme and lexical >= self.MIN_LEXICAL_WITH_PERSON
        )
        return accepted, lexical, has_person_grammeme

    def _build_user_candidate_text(
        self,
        normalized_text: str,
        supplier_phrase: str | None,
        date_phrase: str | None,
        include_debug: bool = False,
    ) -> tuple[str, list[str], list[dict[str, Any]] | None]:
        excluded_tokens: set[str] = set(self.user_matcher.noise_terms)
        if supplier_phrase:
            excluded_tokens.update(normalize_text(supplier_phrase).split())
        if date_phrase:
            excluded_tokens.update(normalize_text(date_phrase).split())
        excluded_tokens.update(self.supplier_terms)

        candidate_tokens: list[str] = []
        candidate_debug: list[dict[str, Any]] | None = [] if include_debug else None
        for token in normalized_text.split():
            if token in excluded_tokens or token.isdigit() or len(token) <= 1:
                continue
            accepted, lexical, has_person_grammeme = self._looks_like_person_token(token)
            if candidate_debug is not None:
                candidate_debug.append({
                    "token": token,
                    "lexical_support": round(lexical, 4),
                    "has_person_grammeme": has_person_grammeme,
                    "accepted": accepted,
                })
            if accepted:
                candidate_tokens.append(token)

        return " ".join(candidate_tokens), candidate_tokens, candidate_debug

    def _match_user_from_candidates(
        self,
        candidate_tokens: list[str],
        include_debug: bool = False,
    ) -> tuple[dict[str, Any], dict[str, Any] | None]:
        phrases: list[str] = []
        seen: set[str] = set()
        max_words = self.user_matcher.max_words
        for i in range(len(candidate_tokens)):
            for j in range(i + 1, min(i + 1 + max_words, len(candidate_tokens) + 1)):
                phrase = " ".join(candidate_tokens[i:j])
                if phrase not in seen:
                    seen.add(phrase)
                    phrases.append(phrase)

        best_row: dict[str, Any] | None = None
        debug_rows: list[dict[str, Any]] = []
        for phrase in phrases:
            row = self.user_matcher.score_phrase(phrase)
            score = float(row.get("score", -1.0))
            support = self.user_matcher.lexical_support(phrase)
            combined = 0.75 * score + 0.25 * support

            if include_debug:
                debug_rows.append({
                    "phrase": phrase,
                    "supplier": row.get("supplier"),
                    "score": round(score, 4),
                    "support": round(support, 4),
                    "combined": round(combined, 4),
                })

            if score >= self.threshold or combined >= self.threshold:
                enriched = {
                    "user": row.get("supplier"),
                    "user_score": round(score, 4) if score >= 0 else None,
                    "matched_user_phrase": phrase,
                    "combined": combined,
                }
                if best_row is None or combined > float(best_row.get("combined", -1.0)):
                    best_row = enriched

        if best_row is None:
            match_payload = {
                "user": None,
                "user_score": None,
                "matched_user_phrase": None,
            }
        else:
            match_payload = {
                "user": best_row.get("user"),
                "user_score": best_row.get("user_score"),
                "matched_user_phrase": best_row.get("matched_user_phrase"),
            }

        match_debug = None
        if include_debug:
            match_debug = {
                "phrases_count": len(phrases),
                "score_threshold": self.threshold,
                "combined_threshold": self.threshold,
                "top_candidates": sorted(debug_rows, key=lambda item: item["combined"], reverse=True)[:8],
            }

        return match_payload, match_debug

    def extract(
        self,
        text: str,
        supplier_phrase: str | None = None,
        date_phrase: str | None = None,
        debug: bool = False,
    ) -> dict[str, Any]:
        normalized_text = normalize_text(text)

        if re.search(r"(?<!\S)я(?!\S)", normalized_text, re.IGNORECASE):
            payload = {
                "user": "Я",
                "user_score": 1.0,
                "matched_user_phrase": "я",
            }
            if debug:
                payload["user_debug"] = {
                    "mode": "direct-pronoun",
                    "normalized_text": normalized_text,
                }
            return payload

        candidate_text, candidate_tokens, candidate_debug = self._build_user_candidate_text(
            normalized_text=normalized_text,
            supplier_phrase=supplier_phrase,
            date_phrase=date_phrase,
            include_debug=debug,
        )

        if not candidate_text:
            payload = {
                "user": None,
                "user_score": None,
                "matched_user_phrase": None,
            }
            match_debug = None
        else:
            payload, match_debug = self._match_user_from_candidates(candidate_tokens, include_debug=debug)

        if debug:
            payload["user_debug"] = {
                "mode": "user-matcher",
                "threshold": self.threshold,
                "rules": {
                    "min_lexical_support": self.MIN_LEXICAL_SUPPORT,
                    "min_lexical_with_person_grammeme": self.MIN_LEXICAL_WITH_PERSON,
                    "morph_enabled": self.morph is not None,
                },
                "excluded_supplier_phrase": supplier_phrase,
                "normalized_text": normalized_text,
                "candidate_text": candidate_text,
                "candidate_tokens": candidate_tokens,
                "candidate_token_debug": candidate_debug or [],
                "matcher_debug": match_debug,
            }

        return payload