"""
  Main Searcher module - executes search queries against Elasticsearch.
  
  Handles query parsing, boolean expressions, ranking, and result formatting.
  """
  
  from typing import Dict, Any, List, Optional
  import time
  
  from config import CustomerConfig
  from utils.es_client import ESClient
  from query import QueryParser, ParsedQuery
  from indexer import MappingGenerator
  from .boolean_parser import BooleanParser, QueryNode
  from .es_query_builder import ESQueryBuilder

  from .multilang_query_builder import MultiLanguageQueryBuilder

  from .ranking_engine import RankingEngine

  from context.request_context import RequestContext, RequestContextStage, create_request_context

  
  
  class SearchResult:
      """Container for search results."""
  
      def __init__(
          self,
          hits: List[Dict[str, Any]],
          total: int,
          max_score: float,
          took_ms: int,
          aggregations: Optional[Dict[str, Any]] = None,
          query_info: Optional[Dict[str, Any]] = None
      ):
          self.hits = hits
          self.total = total
          self.max_score = max_score
          self.took_ms = took_ms
          self.aggregations = aggregations or {}
          self.query_info = query_info or {}
  
      def to_dict(self) -> Dict[str, Any]:
          """Convert to dictionary representation."""
          return {
              "hits": self.hits,
              "total": self.total,
              "max_score": self.max_score,
              "took_ms": self.took_ms,
              "aggregations": self.aggregations,
              "query_info": self.query_info
          }
  
  
  class Searcher:
      """
      Main search engine class.
  
      Handles:
      - Query parsing and translation
      - Boolean expression parsing
      - ES query building
      - Result ranking and formatting
      """
  
      def __init__(
          self,
          config: CustomerConfig,
          es_client: ESClient,
          query_parser: Optional[QueryParser] = None
      ):
          """
          Initialize searcher.
  
          Args:
              config: Customer configuration
              es_client: Elasticsearch client
              query_parser: Query parser (created if not provided)
          """
          self.config = config
          self.es_client = es_client
          self.query_parser = query_parser or QueryParser(config)
  
          # Initialize components
          self.boolean_parser = BooleanParser()
          self.ranking_engine = RankingEngine(config.ranking.expression)
  
          # Get mapping info
          mapping_gen = MappingGenerator(config)
          self.match_fields = mapping_gen.get_match_fields_for_domain("default")
          self.text_embedding_field = mapping_gen.get_text_embedding_field()
          self.image_embedding_field = mapping_gen.get_image_embedding_field()
  

          # Query builder - use multi-language version
          self.query_builder = MultiLanguageQueryBuilder(
              config=config,

              index_name=config.es_index_name,

              text_embedding_field=self.text_embedding_field,
              image_embedding_field=self.image_embedding_field
          )
  
      def search(
          self,
          query: str,
          size: int = 10,
          from_: int = 0,
          filters: Optional[Dict[str, Any]] = None,

          min_score: Optional[float] = None,

          context: Optional[RequestContext] = None,
          aggregations: Optional[Dict[str, Any]] = None,
          sort_by: Optional[str] = None,
          sort_order: Optional[str] = "desc"

      ) -> SearchResult:
          """
          Execute search query.
  
          Args:
              query: Search query string
              size: Number of results to return
              from_: Offset for pagination
              filters: Additional filters (field: value pairs)

              min_score: Minimum score threshold

              context: Request context for tracking (created if not provided)

              aggregations: Aggregation specifications for faceted search
              sort_by: Field name for sorting
              sort_order: Sort order: 'asc' or 'desc'

  
          Returns:
              SearchResult object
          """

          # Create context if not provided (backward compatibility)
          if context is None:
              context = create_request_context()
  
          # Always use config defaults (these are backend configuration, not user parameters)
          enable_translation = self.config.query_config.enable_translation
          enable_embedding = self.config.query_config.enable_text_embedding
          enable_rerank = True  # Always enable reranking as it's part of the search logic
  
          # Start timing
          context.start_stage(RequestContextStage.TOTAL)
  
          context.logger.info(
              f"开始搜索请求 | 查询: '{query}' | 参数: size={size}, from_={from_}, "
              f"enable_translation={enable_translation}, enable_embedding={enable_embedding}, "
              f"enable_rerank={enable_rerank}, min_score={min_score}",
              extra={'reqid': context.reqid, 'uid': context.uid}
          )
  
          # Store search parameters in context
          context.metadata['search_params'] = {
              'size': size,
              'from_': from_,
              'filters': filters,
              'enable_translation': enable_translation,
              'enable_embedding': enable_embedding,
              'enable_rerank': enable_rerank,

              'min_score': min_score,
              'aggregations': aggregations,
              'sort_by': sort_by,
              'sort_order': sort_order

          }

          context.metadata['feature_flags'] = {
              'translation_enabled': enable_translation,
              'embedding_enabled': enable_embedding,
              'rerank_enabled': enable_rerank
          }

  
          # Step 1: Parse query

          context.start_stage(RequestContextStage.QUERY_PARSING)
          try:
              parsed_query = self.query_parser.parse(
                  query,
                  generate_vector=enable_embedding,
                  context=context
              )
              # Store query analysis results in context
              context.store_query_analysis(
                  original_query=parsed_query.original_query,
                  normalized_query=parsed_query.normalized_query,
                  rewritten_query=parsed_query.rewritten_query,
                  detected_language=parsed_query.detected_language,
                  translations=parsed_query.translations,
                  query_vector=parsed_query.query_vector.tolist() if parsed_query.query_vector is not None else None,
                  domain=parsed_query.domain,
                  is_simple_query=self.boolean_parser.is_simple_query(parsed_query.rewritten_query)
              )

              context.logger.info(
                  f"查询解析完成 | 原查询: '{parsed_query.original_query}' | "
                  f"重写后: '{parsed_query.rewritten_query}' | "
                  f"语言: {parsed_query.detected_language} | "
                  f"域: {parsed_query.domain} | "
                  f"向量: {'是' if parsed_query.query_vector is not None else '否'}",
                  extra={'reqid': context.reqid, 'uid': context.uid}
              )
          except Exception as e:
              context.set_error(e)
              context.logger.error(
                  f"查询解析失败 | 错误: {str(e)}",
                  extra={'reqid': context.reqid, 'uid': context.uid}
              )
              raise
          finally:
              context.end_stage(RequestContextStage.QUERY_PARSING)
  
          # Step 2: Boolean parsing
          context.start_stage(RequestContextStage.BOOLEAN_PARSING)
          try:
              query_node = None
              if self.boolean_parser.is_simple_query(parsed_query.rewritten_query):
                  # Simple query
                  query_text = parsed_query.rewritten_query
                  context.logger.debug(
                      f"简单查询 | 无布尔表达式",
                      extra={'reqid': context.reqid, 'uid': context.uid}
                  )
              else:
                  # Complex boolean query
                  query_node = self.boolean_parser.parse(parsed_query.rewritten_query)
                  query_text = parsed_query.rewritten_query
                  context.store_intermediate_result('query_node', query_node)
                  context.store_intermediate_result('boolean_ast', str(query_node))
                  context.logger.info(
                      f"布尔表达式解析 | AST: {query_node}",
                      extra={'reqid': context.reqid, 'uid': context.uid}
                  )
          except Exception as e:
              context.set_error(e)
              context.logger.error(
                  f"布尔表达式解析失败 | 错误: {str(e)}",
                  extra={'reqid': context.reqid, 'uid': context.uid}
              )
              raise
          finally:
              context.end_stage(RequestContextStage.BOOLEAN_PARSING)
  
          # Step 3: Query building
          context.start_stage(RequestContextStage.QUERY_BUILDING)
          try:
              es_query = self.query_builder.build_multilang_query(
                  parsed_query=parsed_query,
                  query_vector=parsed_query.query_vector if enable_embedding else None,
                  query_node=query_node,
                  filters=filters,
                  size=size,
                  from_=from_,
                  enable_knn=enable_embedding and parsed_query.query_vector is not None,
                  min_score=min_score
              )

              # Add SPU collapse if configured
              if self.config.spu_config.enabled:
                  es_query = self.query_builder.add_spu_collapse(
                      es_query,
                      self.config.spu_config.spu_field,
                      self.config.spu_config.inner_hits_size
                  )
  
              # Add aggregations for faceted search

              if aggregations:
                  # Use dynamic aggregations from request
                  es_query = self.query_builder.add_dynamic_aggregations(es_query, aggregations)
              elif filters:
                  # Fallback to filter-based aggregations

                  agg_fields = [f"{k}_keyword" for k in filters.keys() if f"{k}_keyword" in [f.name for f in self.config.fields]]
                  if agg_fields:
                      es_query = self.query_builder.add_aggregations(es_query, agg_fields)
  

              # Add sorting if specified
              if sort_by:
                  es_query = self.query_builder.add_sorting(es_query, sort_by, sort_order)
  

              # Extract size and from from body for ES client parameters
              body_for_es = {k: v for k, v in es_query.items() if k not in ['size', 'from']}
  
              # Store ES query in context
              context.store_intermediate_result('es_query', es_query)
              context.store_intermediate_result('es_body_for_search', body_for_es)
  
              context.logger.info(
                  f"ES查询构建完成 | 大小: {len(str(es_query))}字符 | "
                  f"KNN: {'是' if enable_embedding and parsed_query.query_vector is not None else '否'} | "
                  f"聚合: {'是' if filters else '否'}",
                  extra={'reqid': context.reqid, 'uid': context.uid}
              )
              context.logger.debug(
                  f"ES查询详情: {es_query}",
                  extra={'reqid': context.reqid, 'uid': context.uid}
              )
          except Exception as e:
              context.set_error(e)
              context.logger.error(
                  f"ES查询构建失败 | 错误: {str(e)}",
                  extra={'reqid': context.reqid, 'uid': context.uid}
              )
              raise
          finally:
              context.end_stage(RequestContextStage.QUERY_BUILDING)
  
          # Step 4: Elasticsearch search
          context.start_stage(RequestContextStage.ELASTICSEARCH_SEARCH)
          try:
              es_response = self.es_client.search(
                  index_name=self.config.es_index_name,
                  body=body_for_es,
                  size=size,
                  from_=from_

              )
  

              # Store ES response in context
              context.store_intermediate_result('es_response', es_response)

              # Extract timing from ES response
              es_took = es_response.get('took', 0)
              context.logger.info(
                  f"ES搜索完成 | 耗时: {es_took}ms | "
                  f"命中数: {es_response.get('hits', {}).get('total', {}).get('value', 0)} | "
                  f"最高分: {es_response.get('hits', {}).get('max_score', 0):.3f}",
                  extra={'reqid': context.reqid, 'uid': context.uid}
              )
          except Exception as e:
              context.set_error(e)
              context.logger.error(
                  f"ES搜索执行失败 | 错误: {str(e)}",
                  extra={'reqid': context.reqid, 'uid': context.uid}
              )
              raise
          finally:
              context.end_stage(RequestContextStage.ELASTICSEARCH_SEARCH)
  
          # Step 5: Result processing
          context.start_stage(RequestContextStage.RESULT_PROCESSING)
          try:
              hits = []
              raw_hits = []
  
              if 'hits' in es_response and 'hits' in es_response['hits']:
                  for hit in es_response['hits']['hits']:
                      raw_hits.append(hit)
  
                      result_doc = {
                          '_id': hit['_id'],
                          '_score': hit['_score'],
                          '_source': hit['_source']
                      }
  
                      # Apply custom ranking if enabled
                      if enable_rerank:
                          base_score = hit['_score']
                          knn_score = None
  
                          # Check if KNN was used
                          if 'knn' in es_query:
                              # KNN score would be in the combined score
                              # For simplicity, extract from score
                              knn_score = base_score * 0.2  # Approximate based on our formula
  
                          custom_score = self.ranking_engine.calculate_score(
                              hit,
                              base_score,
                              knn_score
                          )
                          result_doc['_custom_score'] = custom_score
                          result_doc['_original_score'] = base_score
  
                      hits.append(result_doc)
  
                  # Re-sort by custom score if reranking enabled

                  if enable_rerank:

                      hits.sort(key=lambda x: x.get('_custom_score', x['_score']), reverse=True)
                      context.logger.info(
                          f"重排序完成 | 基于自定义评分表达式",
                          extra={'reqid': context.reqid, 'uid': context.uid}

                      )

              # Store intermediate results in context
              context.store_intermediate_result('raw_hits', raw_hits)
              context.store_intermediate_result('processed_hits', hits)

              # Extract total and max_score
              total = es_response.get('hits', {}).get('total', {})
              if isinstance(total, dict):
                  total_value = total.get('value', 0)
              else:
                  total_value = total

              max_score = es_response.get('hits', {}).get('max_score', 0.0)

              # Extract aggregations
              aggregations = es_response.get('aggregations', {})

              context.logger.info(
                  f"结果处理完成 | 返回: {len(hits)}条 | 总计: {total_value}条 | "
                  f"重排序: {'是' if enable_rerank else '否'}",
                  extra={'reqid': context.reqid, 'uid': context.uid}
              )
  
          except Exception as e:
              context.set_error(e)
              context.logger.error(
                  f"结果处理失败 | 错误: {str(e)}",
                  extra={'reqid': context.reqid, 'uid': context.uid}
              )
              raise
          finally:
              context.end_stage(RequestContextStage.RESULT_PROCESSING)

          # End total timing and build result
          total_duration = context.end_stage(RequestContextStage.TOTAL)
          context.performance_metrics.total_duration = total_duration

  
          # Build result
          result = SearchResult(
              hits=hits,
              total=total_value,
              max_score=max_score,

              took_ms=int(total_duration),

              aggregations=aggregations,
              query_info=parsed_query.to_dict()
          )
  

          # Log complete performance summary
          context.log_performance_summary()

  
          return result
  
      def search_by_image(
          self,
          image_url: str,
          size: int = 10,
          filters: Optional[Dict[str, Any]] = None
      ) -> SearchResult:
          """
          Search by image similarity.
  
          Args:
              image_url: URL of query image
              size: Number of results
              filters: Additional filters
  
          Returns:
              SearchResult object
          """
          if not self.image_embedding_field:
              raise ValueError("Image embedding field not configured")
  
          # Generate image embedding
          from embeddings import CLIPImageEncoder
          image_encoder = CLIPImageEncoder()
          image_vector = image_encoder.encode_image_from_url(image_url)
  
          if image_vector is None:
              raise ValueError(f"Failed to encode image: {image_url}")
  
          # Build KNN query
          es_query = {
              "size": size,
              "knn": {
                  "field": self.image_embedding_field,
                  "query_vector": image_vector.tolist(),
                  "k": size,
                  "num_candidates": size * 10
              }
          }
  
          if filters:
              es_query["query"] = {
                  "bool": {
                      "filter": self.query_builder._build_filters(filters)
                  }
              }
  
          # Execute search
          es_response = self.es_client.search(
              index_name=self.config.es_index_name,
              body=es_query,
              size=size
          )
  
          # Process results (similar to text search)
          hits = []
          if 'hits' in es_response and 'hits' in es_response['hits']:
              for hit in es_response['hits']['hits']:
                  hits.append({
                      '_id': hit['_id'],
                      '_score': hit['_score'],
                      '_source': hit['_source']
                  })
  
          total = es_response.get('hits', {}).get('total', {})
          if isinstance(total, dict):
              total_value = total.get('value', 0)
          else:
              total_value = total
  
          return SearchResult(
              hits=hits,
              total=total_value,
              max_score=es_response.get('hits', {}).get('max_score', 0.0),
              took_ms=es_response.get('took', 0),
              query_info={'image_url': image_url, 'search_type': 'image_similarity'}
          )
  

      def get_domain_summary(self) -> Dict[str, Any]:
          """
          Get summary of all configured domains.
  
          Returns:
              Dictionary with domain information
          """
          return self.query_builder.get_domain_summary()
  

      def get_document(self, doc_id: str) -> Optional[Dict[str, Any]]:
          """
          Get single document by ID.
  
          Args:
              doc_id: Document ID
  
          Returns:
              Document or None if not found
          """
          try:
              response = self.es_client.client.get(
                  index=self.config.es_index_name,
                  id=doc_id
              )
              return response.get('_source')
          except Exception as e:
              print(f"[Searcher] Failed to get document {doc_id}: {e}")
              return None