"""
  Style intent detection for query understanding.
  """
  
  from __future__ import annotations
  
  from dataclasses import dataclass, field
  from typing import Any, Callable, Dict, Iterable, List, Optional, Sequence, Set, Tuple
  
  from .tokenization import TokenizedText, normalize_query_text, tokenize_text
  
  
  @dataclass(frozen=True)

  class StyleIntentTermDefinition:
      canonical_value: str
      en_terms: Tuple[str, ...]
      zh_terms: Tuple[str, ...]
      attribute_terms: Tuple[str, ...]
  
  
  @dataclass(frozen=True)

  class StyleIntentDefinition:
      intent_type: str

      terms: Tuple[StyleIntentTermDefinition, ...]

      dimension_aliases: Tuple[str, ...]

      en_synonym_to_term: Dict[str, StyleIntentTermDefinition]
      zh_synonym_to_term: Dict[str, StyleIntentTermDefinition]

      max_term_ngram: int = 3
  
      @classmethod
      def from_rows(
          cls,
          intent_type: str,

          rows: Sequence[Dict[str, List[str]]],

          dimension_aliases: Sequence[str],
      ) -> "StyleIntentDefinition":

          terms: List[StyleIntentTermDefinition] = []
          en_synonym_to_term: Dict[str, StyleIntentTermDefinition] = {}
          zh_synonym_to_term: Dict[str, StyleIntentTermDefinition] = {}

          max_ngram = 1
  
          for row in rows:

              normalized_en = tuple(
                  dict.fromkeys(
                      term
                      for term in (normalize_query_text(raw) for raw in row.get("en_terms", []))
                      if term
                  )
              )
              normalized_zh = tuple(
                  dict.fromkeys(
                      term
                      for term in (normalize_query_text(raw) for raw in row.get("zh_terms", []))
                      if term
                  )
              )
              normalized_attribute = tuple(
                  dict.fromkeys(
                      term
                      for term in (normalize_query_text(raw) for raw in row.get("attribute_terms", []))
                      if term
                  )
              )
              if not normalized_en and not normalized_zh and not normalized_attribute:

                  continue
  

              canonical = (
                  normalized_attribute[0]
                  if normalized_attribute
                  else normalized_en[0]
                  if normalized_en
                  else normalized_zh[0]
              )
              term_definition = StyleIntentTermDefinition(
                  canonical_value=canonical,
                  en_terms=normalized_en,
                  zh_terms=normalized_zh,
                  attribute_terms=normalized_attribute,
              )
              terms.append(term_definition)
  
              for term in normalized_en:
                  en_synonym_to_term[term] = term_definition
                  max_ngram = max(max_ngram, len(term.split()))
              for term in normalized_zh:
                  zh_synonym_to_term[term] = term_definition

                  max_ngram = max(max_ngram, len(term.split()))
  
          aliases = tuple(
              dict.fromkeys(
                  term
                  for term in (
                      normalize_query_text(alias)
                      for alias in dimension_aliases
                  )
                  if term
              )
          )
  
          return cls(
              intent_type=intent_type,

              terms=tuple(terms),

              dimension_aliases=aliases,

              en_synonym_to_term=en_synonym_to_term,
              zh_synonym_to_term=zh_synonym_to_term,

              max_term_ngram=max_ngram,
          )
  

      def match_candidates(self, candidates: Iterable[str], *, language: str) -> Set[StyleIntentTermDefinition]:
          mapping = self.zh_synonym_to_term if language == "zh" else self.en_synonym_to_term
          matched: Set[StyleIntentTermDefinition] = set()

          for candidate in candidates:

              term_definition = mapping.get(normalize_query_text(candidate))
              if term_definition:
                  matched.add(term_definition)

          return matched
  
      def match_text(
          self,
          text: str,
          *,

          language: str,

          tokenizer: Optional[Callable[[str], Any]] = None,

      ) -> Set[StyleIntentTermDefinition]:

          bundle = tokenize_text(text, tokenizer=tokenizer, max_ngram=self.max_term_ngram)

          return self.match_candidates(bundle.candidates, language=language)

  
  
  @dataclass(frozen=True)
  class DetectedStyleIntent:
      intent_type: str
      canonical_value: str
      matched_term: str
      matched_query_text: str

      attribute_terms: Tuple[str, ...]

      dimension_aliases: Tuple[str, ...]
  
      def to_dict(self) -> Dict[str, Any]:
          return {
              "intent_type": self.intent_type,
              "canonical_value": self.canonical_value,
              "matched_term": self.matched_term,
              "matched_query_text": self.matched_query_text,

              "attribute_terms": list(self.attribute_terms),

              "dimension_aliases": list(self.dimension_aliases),
          }
  
  
  @dataclass(frozen=True)
  class StyleIntentProfile:
      query_variants: Tuple[TokenizedText, ...] = field(default_factory=tuple)
      intents: Tuple[DetectedStyleIntent, ...] = field(default_factory=tuple)
  
      @property
      def is_active(self) -> bool:
          return bool(self.intents)
  
      def get_intents(self, intent_type: Optional[str] = None) -> List[DetectedStyleIntent]:
          if intent_type is None:
              return list(self.intents)
          normalized = normalize_query_text(intent_type)
          return [intent for intent in self.intents if intent.intent_type == normalized]
  
      def get_canonical_values(self, intent_type: str) -> Set[str]:
          return {intent.canonical_value for intent in self.get_intents(intent_type)}
  
      def to_dict(self) -> Dict[str, Any]:
          return {
              "active": self.is_active,
              "intents": [intent.to_dict() for intent in self.intents],
              "query_variants": [
                  {
                      "text": variant.text,
                      "normalized_text": variant.normalized_text,
                      "fine_tokens": list(variant.fine_tokens),
                      "coarse_tokens": list(variant.coarse_tokens),
                      "candidates": list(variant.candidates),
                  }
                  for variant in self.query_variants
              ],
          }
  
  
  class StyleIntentRegistry:
      """Holds style intent vocabularies and matching helpers."""
  
      def __init__(
          self,
          definitions: Dict[str, StyleIntentDefinition],
          *,
          enabled: bool = True,
      ) -> None:
          self.definitions = definitions
          self.enabled = bool(enabled)
  
      @classmethod
      def from_query_config(cls, query_config: Any) -> "StyleIntentRegistry":
          style_terms = getattr(query_config, "style_intent_terms", {}) or {}
          dimension_aliases = getattr(query_config, "style_intent_dimension_aliases", {}) or {}
          definitions: Dict[str, StyleIntentDefinition] = {}
  
          for intent_type, rows in style_terms.items():
              definition = StyleIntentDefinition.from_rows(
                  intent_type=normalize_query_text(intent_type),
                  rows=rows or [],
                  dimension_aliases=dimension_aliases.get(intent_type, []),
              )

              if definition.terms:

                  definitions[definition.intent_type] = definition
  
          return cls(
              definitions,
              enabled=bool(getattr(query_config, "style_intent_enabled", True)),
          )
  
      def get_definition(self, intent_type: str) -> Optional[StyleIntentDefinition]:
          return self.definitions.get(normalize_query_text(intent_type))
  
      def get_dimension_aliases(self, intent_type: str) -> Tuple[str, ...]:
          definition = self.get_definition(intent_type)
          return definition.dimension_aliases if definition else tuple()
  
  
  class StyleIntentDetector:
      """Detects style intents from parsed query variants."""
  
      def __init__(
          self,
          registry: StyleIntentRegistry,
          *,
          tokenizer: Optional[Callable[[str], Any]] = None,
      ) -> None:
          self.registry = registry
          self.tokenizer = tokenizer
  
      def _build_query_variants(self, parsed_query: Any) -> Tuple[TokenizedText, ...]:
          seen = set()
          variants: List[TokenizedText] = []
          texts = [

              self._get_language_query_text(parsed_query, "zh"),
              self._get_language_query_text(parsed_query, "en"),

          ]
  

          for raw_text in texts:
              text = str(raw_text or "").strip()
              if not text:
                  continue
              normalized = normalize_query_text(text)
              if not normalized or normalized in seen:
                  continue
              seen.add(normalized)
              variants.append(
                  tokenize_text(
                      text,
                      tokenizer=self.tokenizer,
                      max_ngram=max(
                          (definition.max_term_ngram for definition in self.registry.definitions.values()),
                          default=3,
                      ),
                  )
              )
  
          return tuple(variants)
  

      @staticmethod
      def _get_language_query_text(parsed_query: Any, language: str) -> str:
          translations = getattr(parsed_query, "translations", {}) or {}
          if isinstance(translations, dict):
              translated = translations.get(language)
              if translated:
                  return str(translated)
          return str(getattr(parsed_query, "original_query", "") or "")
  
      def _tokenize_language_query(self, parsed_query: Any, language: str) -> Optional[TokenizedText]:
          text = self._get_language_query_text(parsed_query, language).strip()
          if not text:
              return None
          return tokenize_text(
              text,
              tokenizer=self.tokenizer,
              max_ngram=max(
                  (definition.max_term_ngram for definition in self.registry.definitions.values()),
                  default=3,
              ),
          )
  

      def detect(self, parsed_query: Any) -> StyleIntentProfile:
          if not self.registry.enabled or not self.registry.definitions:
              return StyleIntentProfile()
  
          query_variants = self._build_query_variants(parsed_query)

          zh_variant = self._tokenize_language_query(parsed_query, "zh")
          en_variant = self._tokenize_language_query(parsed_query, "en")

          detected: List[DetectedStyleIntent] = []
          seen_pairs = set()
  

          for intent_type, definition in self.registry.definitions.items():
              for language, variant, mapping in (
                  ("zh", zh_variant, definition.zh_synonym_to_term),
                  ("en", en_variant, definition.en_synonym_to_term),
              ):
                  if variant is None or not mapping:
                      continue
  
                  matched_terms = definition.match_candidates(variant.candidates, language=language)
                  if not matched_terms:

                      continue
  
                  for candidate in variant.candidates:
                      normalized_candidate = normalize_query_text(candidate)

                      term_definition = mapping.get(normalized_candidate)
                      if term_definition is None or term_definition not in matched_terms:

                          continue

                      pair = (intent_type, term_definition.canonical_value)

                      if pair in seen_pairs:
                          continue
                      seen_pairs.add(pair)
                      detected.append(
                          DetectedStyleIntent(
                              intent_type=intent_type,

                              canonical_value=term_definition.canonical_value,

                              matched_term=normalized_candidate,
                              matched_query_text=variant.text,

                              attribute_terms=term_definition.attribute_terms,

                              dimension_aliases=definition.dimension_aliases,
                          )
                      )
                      break
  
          return StyleIntentProfile(
              query_variants=query_variants,
              intents=tuple(detected),
          )