import json

  from datetime import datetime, timedelta, timezone

  from typing import Any, Dict, List
  
  import pytest
  

  from suggestion.builder import (
      QueryDelta,
      SuggestionIndexBuilder,
      get_suggestion_alias_name,
  )

  from suggestion.service import SuggestionService
  
  
  class FakeESClient:

      """Lightweight fake ES client for suggestion unit tests."""

  
      def __init__(self) -> None:
          self.calls: List[Dict[str, Any]] = []

          self.indices: set[str] = set()
          self.aliases: Dict[str, List[str]] = {}
          self.client = self  # support service._completion_suggest -> self.es_client.client.search

      def search(
          self,
          index_name: str = None,
          body: Dict[str, Any] = None,
          size: int = 10,
          from_: int = 0,
          routing: str = None,
          index: str = None,
          **kwargs,
      ) -> Dict[str, Any]:
          idx = index_name or index
          body = body or {}
          self.calls.append(
              {
                  "op": "search",
                  "index": idx,
                  "body": body,
                  "size": size,
                  "from": from_,
                  "routing": routing,
              }
          )
  
          # Completion suggest path
          if "suggest" in body:
              return {
                  "suggest": {
                      "s": [
                          {
                              "text": "iph",
                              "offset": 0,
                              "length": 3,
                              "options": [
                                  {
                                      "text": "iphone 15",
                                      "_score": 6.3,
                                      "_source": {
                                          "text": "iphone 15",
                                          "lang": "en",
                                          "rank_score": 5.0,
                                          "sources": ["query_log", "qanchor"],
                                          "lang_source": "log_field",
                                          "lang_confidence": 1.0,
                                          "lang_conflict": False,
                                      },
                                  }
                              ],
                          }
                      ]
                  }
              }
  
          # bool_prefix path
          if idx and "search_suggestions_tenant_" in idx:

              return {
                  "hits": {
                      "total": {"value": 1},
                      "max_score": 3.2,
                      "hits": [
                          {
                              "_id": "1",
                              "_score": 3.2,
                              "_source": {
                                  "text": "iphone 15",
                                  "lang": "en",
                                  "rank_score": 5.0,
                                  "sources": ["query_log", "qanchor"],
                                  "lang_source": "log_field",
                                  "lang_confidence": 1.0,
                                  "lang_conflict": False,

                              },
                          }
                      ],
                  }
              }

          return {"hits": {"total": {"value": 0}, "max_score": 0.0, "hits": []}}
  

      def bulk_index(self, index_name: str, docs: List[Dict[str, Any]]) -> Dict[str, Any]:

          self.calls.append({"op": "bulk_index", "index": index_name, "docs": docs})

          return {"success": len(docs), "failed": 0, "errors": []}
  

      def bulk_actions(self, actions: List[Dict[str, Any]]) -> Dict[str, Any]:
          self.calls.append({"op": "bulk_actions", "actions": actions})
          return {"success": len(actions), "failed": 0, "errors": []}
  

      def index_exists(self, index_name: str) -> bool:

          return index_name in self.indices

  
      def delete_index(self, index_name: str) -> bool:

          if index_name in self.indices:
              self.indices.remove(index_name)
              return True
          return False

  
      def create_index(self, index_name: str, body: Dict[str, Any]) -> bool:

          self.calls.append({"op": "create_index", "index": index_name, "body": body})
          self.indices.add(index_name)

          return True
  
      def refresh(self, index_name: str) -> bool:

          self.calls.append({"op": "refresh", "index": index_name})
          return True
  
      def alias_exists(self, alias_name: str) -> bool:
          return alias_name in self.aliases and len(self.aliases[alias_name]) > 0
  
      def get_alias_indices(self, alias_name: str) -> List[str]:
          return list(self.aliases.get(alias_name, []))
  
      def update_aliases(self, actions: List[Dict[str, Any]]) -> bool:
          self.calls.append({"op": "update_aliases", "actions": actions})
          for action in actions:
              if "remove" in action:
                  alias = action["remove"]["alias"]
                  index = action["remove"]["index"]
                  self.aliases[alias] = [x for x in self.aliases.get(alias, []) if x != index]
              if "add" in action:
                  alias = action["add"]["alias"]
                  index = action["add"]["index"]
                  self.aliases[alias] = [index]

          return True
  

      def list_indices(self, pattern: str) -> List[str]:
          prefix = pattern.rstrip("*")
          return sorted([x for x in self.indices if x.startswith(prefix)])
  

  
  @pytest.mark.unit

  def test_resolve_query_language_prefers_log_field():

      fake_es = FakeESClient()
      builder = SuggestionIndexBuilder(es_client=fake_es, db_engine=None)

      lang, conf, source, conflict = builder._resolve_query_language(
          query="iphone 15",
          log_language="en",
          request_params=None,
          index_languages=["zh", "en"],
          primary_language="zh",
      )
      assert lang == "en"
      assert conf == 1.0
      assert source == "log_field"
      assert conflict is False
  
  
  @pytest.mark.unit
  def test_resolve_query_language_uses_request_params_when_log_missing():

      fake_es = FakeESClient()
      builder = SuggestionIndexBuilder(es_client=fake_es, db_engine=None)
      request_params = json.dumps({"language": "zh"})
      lang, conf, source, conflict = builder._resolve_query_language(
          query="芭比娃娃",
          log_language=None,
          request_params=request_params,
          index_languages=["zh", "en"],
          primary_language="en",
      )
      assert lang == "zh"
      assert conf == 1.0
      assert source == "request_params"
      assert conflict is False
  
  
  @pytest.mark.unit
  def test_resolve_query_language_fallback_to_primary():

      fake_es = FakeESClient()
      builder = SuggestionIndexBuilder(es_client=fake_es, db_engine=None)

      lang, conf, source, conflict = builder._resolve_query_language(

          query="123",

          log_language=None,
          request_params=None,
          index_languages=["zh", "en"],
          primary_language="zh",
      )
      assert lang == "zh"
      assert source == "default"
      assert conflict is False
  
  
  @pytest.mark.unit

  def test_suggestion_service_basic_flow_uses_alias_and_routing():

      from config import tenant_config_loader as tcl
  
      loader = tcl.get_tenant_config_loader()

      loader._config = {
          "default": {"primary_language": "en", "index_languages": ["en", "zh"]},
          "tenants": {
              "1": {"primary_language": "en", "index_languages": ["en", "zh"]},
          },
      }
  
      fake_es = FakeESClient()

      alias_name = get_suggestion_alias_name("1")
      fake_es.aliases[alias_name] = ["search_suggestions_tenant_1_v20260310190000"]
  

      service = SuggestionService(es_client=fake_es)
      result = service.search(
          tenant_id="1",
          query="iph",
          language="en",
          size=5,

      )
  
      assert result["resolved_language"] == "en"
      assert result["query"] == "iph"
      assert result["took_ms"] >= 0
      suggestions = result["suggestions"]
      assert len(suggestions) == 1

      assert suggestions[0]["text"] == "iphone 15"
  
      search_calls = [x for x in fake_es.calls if x.get("op") == "search"]
      assert len(search_calls) >= 2
      assert any(x.get("routing") == "1" for x in search_calls)
      assert any(x.get("index") == alias_name for x in search_calls)
  
  
  @pytest.mark.unit
  def test_publish_alias_and_cleanup_old_versions(monkeypatch):
      fake_es = FakeESClient()
      builder = SuggestionIndexBuilder(es_client=fake_es, db_engine=None)
  
      tenant_id = "162"
      alias_name = get_suggestion_alias_name(tenant_id)
      fake_es.indices.update(
          {
              "search_suggestions_tenant_162_v20260310170000",
              "search_suggestions_tenant_162_v20260310180000",
              "search_suggestions_tenant_162_v20260310190000",
          }
      )
      fake_es.aliases[alias_name] = ["search_suggestions_tenant_162_v20260310180000"]
  
      monkeypatch.setattr(builder, "_upsert_meta", lambda tenant_id, patch: None)
  
      result = builder._publish_alias(
          tenant_id=tenant_id,
          index_name="search_suggestions_tenant_162_v20260310190000",
          keep_versions=2,
      )
  
      assert result["current_index"] == "search_suggestions_tenant_162_v20260310190000"
      assert fake_es.aliases[alias_name] == ["search_suggestions_tenant_162_v20260310190000"]
      assert "search_suggestions_tenant_162_v20260310170000" not in fake_es.indices
  
  
  @pytest.mark.unit
  def test_incremental_bootstrap_when_no_active_index(monkeypatch):
      fake_es = FakeESClient()
      builder = SuggestionIndexBuilder(es_client=fake_es, db_engine=None)
  
      from config import tenant_config_loader as tcl
  
      loader = tcl.get_tenant_config_loader()
      loader._config = {
          "default": {"primary_language": "en", "index_languages": ["en", "zh"]},
          "tenants": {"162": {"primary_language": "en", "index_languages": ["en", "zh"]}},
      }
  
      monkeypatch.setattr(
          builder,
          "rebuild_tenant_index",
          lambda **kwargs: {"mode": "full", "tenant_id": kwargs["tenant_id"], "index_name": "v_idx"},
      )
  
      result = builder.incremental_update_tenant_index(tenant_id="162", bootstrap_if_missing=True)
      assert result["mode"] == "incremental"
      assert result["bootstrapped"] is True
      assert result["bootstrap_result"]["mode"] == "full"
  
  
  @pytest.mark.unit
  def test_incremental_updates_existing_index(monkeypatch):
      fake_es = FakeESClient()
      builder = SuggestionIndexBuilder(es_client=fake_es, db_engine=None)
  
      from config import tenant_config_loader as tcl
  
      loader = tcl.get_tenant_config_loader()
      loader._config = {
          "default": {"primary_language": "en", "index_languages": ["en", "zh"]},
          "tenants": {"162": {"primary_language": "en", "index_languages": ["en", "zh"]}},
      }
  
      tenant_id = "162"
      alias_name = get_suggestion_alias_name(tenant_id)
      active_index = "search_suggestions_tenant_162_v20260310190000"
      fake_es.aliases[alias_name] = [active_index]
  
      watermark = (datetime.now(timezone.utc) - timedelta(hours=1)).isoformat()
      monkeypatch.setattr(builder, "_get_meta", lambda _tenant_id: {"last_incremental_watermark": watermark})
      monkeypatch.setattr(builder, "_upsert_meta", lambda tenant_id, patch: None)
  
      monkeypatch.setattr(
          builder,
          "_build_incremental_deltas",
          lambda **kwargs: {
              ("en", "iphone 15"): QueryDelta(
                  tenant_id=tenant_id,
                  lang="en",
                  text="iphone 15",
                  text_norm="iphone 15",
                  delta_7d=2,
                  delta_30d=3,
                  lang_confidence=1.0,
                  lang_source="log_field",
                  lang_conflict=False,
              )
          },
      )
  
      result = builder.incremental_update_tenant_index(
          tenant_id=tenant_id,
          bootstrap_if_missing=False,
          overlap_minutes=10,
      )
  
      assert result["mode"] == "incremental"
      assert result["target_index"] == active_index
      assert result["updated_terms"] == 1
      assert result["bulk_result"]["failed"] == 0

      bulk_calls = [x for x in fake_es.calls if x.get("op") == "bulk_actions"]
      assert len(bulk_calls) == 1
      assert len(bulk_calls[0]["actions"]) == 1

  
  
  @pytest.mark.unit
  def test_build_full_candidates_fallback_to_id_when_spu_id_missing(monkeypatch):
      fake_es = FakeESClient()
      builder = SuggestionIndexBuilder(es_client=fake_es, db_engine=None)
  
      monkeypatch.setattr(
          builder,
          "_iter_products",
          lambda tenant_id, batch_size=500: iter(
              [
                  {
                      "_id": "521",
                      "_source": {
                          "id": "521",
                          "title": {"en": "Furby Toy"},
                          "qanchors": {"en": "furby"},
                      },
                  }
              ]
          ),
      )
      monkeypatch.setattr(builder, "_iter_query_log_rows", lambda **kwargs: iter([]))
  
      key_to_candidate = builder._build_full_candidates(
          tenant_id="162",
          index_languages=["en"],
          primary_language="en",
          days=365,
          batch_size=100,
          min_query_len=1,
      )
  
      title_key = ("en", "furby toy")
      qanchor_key = ("en", "furby")
      assert title_key in key_to_candidate
      assert qanchor_key in key_to_candidate
      assert key_to_candidate[title_key].title_spu_ids == {"521"}
      assert key_to_candidate[qanchor_key].qanchor_spu_ids == {"521"}
  
  
  @pytest.mark.unit
  def test_build_full_candidates_splits_long_title_for_suggest(monkeypatch):
      fake_es = FakeESClient()
      builder = SuggestionIndexBuilder(es_client=fake_es, db_engine=None)
  
      long_title = (
          "Furby Furblets 2-Pack, Mini Friends Ray-Vee & Hip-Bop, 45+ Sounds Each, "
          "Music & Furbish Phrases, Electronic Plush Toys, Rainbow & Pink/Purple, "
          "Ages 6+ (Amazon Exclusive)"
      )
      monkeypatch.setattr(
          builder,
          "_iter_products",
          lambda tenant_id, batch_size=500: iter(
              [{"_id": "521", "_source": {"id": "521", "title": {"en": long_title}, "qanchors": {}}}]
          ),
      )
      monkeypatch.setattr(builder, "_iter_query_log_rows", lambda **kwargs: iter([]))
  
      key_to_candidate = builder._build_full_candidates(
          tenant_id="162",
          index_languages=["en"],
          primary_language="en",
          days=365,
          batch_size=100,
          min_query_len=1,
      )
  
      key = ("en", "furby furblets 2-pack")
      assert key in key_to_candidate
      assert key_to_candidate[key].text == "Furby Furblets 2-Pack"
  
  
  @pytest.mark.unit
  def test_iter_products_requests_dual_sort_and_fields():
      fake_es = FakeESClient()
      builder = SuggestionIndexBuilder(es_client=fake_es, db_engine=None)
  
      list(builder._iter_products(tenant_id="162", batch_size=10))
  
      search_calls = [x for x in fake_es.calls if x.get("op") == "search"]
      assert len(search_calls) >= 1
      body = search_calls[0]["body"]
      sort = body.get("sort", [])
      assert {"spu_id": {"order": "asc", "missing": "_last"}} in sort
      assert {"id.keyword": {"order": "asc", "missing": "_last"}} in sort
      assert "id" in body.get("_source", [])
      assert "spu_id" in body.get("_source", [])