[search] Added an event that identifies which search result was chosen.

This commit introduces a new Alohalytics event key: "searchShowResult".

map/framework.cpp

@@ -1082,6 +1082,10 @@ void Framework::ShowSearchResult(search::Result const & res)
   using namespace search;
   using namespace feature;
 
+  alohalytics::TStringMap stats = {{"pos", strings::to_string(res.GetPositionInResults())},
+                                   {"result", DebugPrint(res)}};
+  alohalytics::LogEvent("searchShowResult", stats);
+
   switch (res.GetResultType())
   {
     case Result::RESULT_FEATURE:

search/result.cpp

@@ -14,19 +14,41 @@ Result::Result(FeatureID const & id, m2::PointD const & pt, string const & str,
   , m_type(type)
   , m_featureType(featureType)
   , m_metadata(meta)
+  , m_positionInResults(-1)
 {
   Init(true /* metadataInitialized */);
 }
 
 Result::Result(FeatureID const & id, m2::PointD const & pt, string const & str, string const & type)
-  : m_id(id)
-  , m_center(pt)
-  , m_str(str)
-  , m_type(type)
+  : m_id(id), m_center(pt), m_str(str), m_type(type), m_positionInResults(-1)
 {
   Init(false /* metadataInitialized */);
 }
 
+Result::Result(m2::PointD const & pt, string const & str, string const & region,
+               string const & type)
+  : m_center(pt), m_str(str), m_region(region), m_type(type), m_positionInResults(-1)
+{
+}
+
+Result::Result(string const & str, string const & suggest)
+  : m_str(str), m_suggestionStr(suggest), m_positionInResults(-1)
+{
+}
+
+Result::Result(Result const & res, string const & suggest)
+  : m_id(res.m_id)
+  , m_center(res.m_center)
+  , m_str(res.m_str)
+  , m_region(res.m_region)
+  , m_type(res.m_type)
+  , m_featureType(res.m_featureType)
+  , m_suggestionStr(suggest)
+  , m_hightlightRanges(res.m_hightlightRanges)
+  , m_positionInResults(-1)
+{
+}
+
 void Result::Init(bool metadataInitialized)
 {
   // Features with empty names can be found after suggestion.
@@ -36,24 +58,6 @@ void Result::Init(bool metadataInitialized)
   m_metadata.m_isInitialized = metadataInitialized;
 }
 
-Result::Result(m2::PointD const & pt, string const & str,
-               string const & region, string const & type)
-  : m_center(pt), m_str(str), m_region(region), m_type(type)
-{
-}
-
-Result::Result(string const & str, string const & suggest)
-  : m_str(str), m_suggestionStr(suggest)
-{
-}
-
-Result::Result(Result const & res, string const & suggest)
-  : m_id(res.m_id), m_center(res.m_center), m_str(res.m_str),
-    m_region(res.m_region), m_type(res.m_type), m_featureType(res.m_featureType),
-    m_suggestionStr(suggest), m_hightlightRanges(res.m_hightlightRanges)
-{
-}
-
 Result::ResultType Result::GetResultType() const
 {
   bool const idValid = m_id.IsValid();

search/result.hpp

@@ -91,6 +91,9 @@ public:
 
   void AppendCity(string const & name);
 
+  int32_t GetPositionInResults() const { return m_positionInResults; }
+  void SetPositionInResults(int32_t pos) { m_positionInResults = pos; }
+
 private:
   void Init(bool metadataInitialized);
 
@@ -101,6 +104,10 @@ private:
   string m_suggestionStr;
   buffer_vector<pair<uint16_t, uint16_t>, 4> m_hightlightRanges;
 
+  // The position that this result occupied in the vector returned
+  // by a search query. -1 if undefined.
+  int32_t m_positionInResults;
+
 public:
   Metadata m_metadata;
 };

search/search_engine.cpp

@@ -181,6 +181,9 @@ void Engine::EmitResults(SearchParams const & params, m2::RectD const & viewport
   };
   alohalytics::LogEvent("searchEmitResults", stats);
 
+  for (size_t i = 0; i < res.GetCount(); ++i)
+    res.GetResult(i).SetPositionInResults(i);
+
   params.m_callback(res);
 }