Improve search relevance and artist transliteration

services/api/internal/search/meili.go

@@ -141,13 +141,15 @@ type MultiQuery struct {
 	Q                    string   `json:"q"`
 	Limit                int      `json:"limit"`
 	Offset               int      `json:"offset,omitempty"`
+	MatchingStrategy     string   `json:"matchingStrategy,omitempty"`
 	AttributesToRetrieve []string `json:"attributesToRetrieve"`
 }
 
 // MultiResult — ответ на один запрос: id найденных документов и оценка общего числа.
 type MultiResult struct {
-	IDs   []string
-	Total int
+	IDs      []string
+	Total    int
+	ExactIDs []string
 }
 
 // MultiSearch выполняет несколько запросов за один вызов.
@@ -155,7 +157,9 @@ func (m *Meili) MultiSearch(ctx context.Context, queries []MultiQuery) ([]MultiR
 	var res struct {
 		Results []struct {
 			Hits []struct {
-				ID string `json:"id"`
+				ID           string `json:"id"`
+				Name         string `json:"name"`
+				NameTranslit any    `json:"name_translit"`
 			} `json:"hits"`
 			EstimatedTotalHits int `json:"estimatedTotalHits"`
 		} `json:"results"`
@@ -167,8 +171,32 @@ func (m *Meili) MultiSearch(ctx context.Context, queries []MultiQuery) ([]MultiR
 	for i, r := range res.Results {
 		for _, h := range r.Hits {
 			out[i].IDs = append(out[i].IDs, h.ID)
+			if exactArtistName(queries[i].Q, h.Name, h.NameTranslit) {
+				out[i].ExactIDs = append(out[i].ExactIDs, h.ID)
+			}
 		}
 		out[i].Total = r.EstimatedTotalHits
 	}
 	return out, nil
 }
+
+func exactArtistName(query, name string, translit any) bool {
+	key := searchKey(query)
+	if key == "" {
+		return false
+	}
+	if searchKey(name) == key {
+		return true
+	}
+	switch v := translit.(type) {
+	case string: // indexes built before transliteration alternatives
+		return searchKey(v) == key
+	case []any:
+		for _, item := range v {
+			if s, ok := item.(string); ok && searchKey(s) == key {
+				return true
+			}
+		}
+	}
+	return false
+}