fix: the assistant is told which search engine it has, results say which one they came from (and why, when DuckDuckGo stood in), the stand-in is logged

internal/server/search.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 	"html"
 	"io"
+	"log"
 	"net/http"
 	"net/url"
 	"regexp"
@@ -99,8 +100,23 @@ var (
 	ddgSearch = webSearch
 )
 
-// searchWith asks the engine c names; DuckDuckGo if that one fails.
-func searchWith(ctx context.Context, c searchConf, q string, n int) ([]searchResult, error) {
+// engineName is how the engine is called to people and to the model.
+func engineName(e string) string {
+	switch e {
+	case "searxng":
+		return "SearXNG"
+	case "brave":
+		return "Brave Search"
+	case "tavily":
+		return "Tavily"
+	}
+	return "DuckDuckGo"
+}
+
+// searchWith asks the engine c names; DuckDuckGo if that one fails. It
+// tells which engine the results came from (and why, when it was not the
+// chosen one).
+func searchWith(ctx context.Context, c searchConf, q string, n int) ([]searchResult, string, error) {
 	var rs []searchResult
 	var err error
 	switch c.Engine {
@@ -111,15 +127,30 @@ func searchWith(ctx context.Context, c searchConf, q string, n int) ([]searchRes
 	case "tavily":
 		rs, err = searchTavily(ctx, c, q, n)
 	default:
-		return ddgSearch(ctx, q, n)
+		rs, err = ddgSearch(ctx, q, n)
+		return rs, "DuckDuckGo", err
 	}
 	if err != nil || len(rs) == 0 {
-		return ddgSearch(ctx, q, n)
+		why := "ничего не нашёл"
+		if err != nil {
+			why = err.Error()
+		}
+		log.Printf("search: %s failed (%s), DuckDuckGo instead", engineName(c.Engine), why)
+		rs, err = ddgSearch(ctx, q, n)
+		return rs, "DuckDuckGo (" + engineName(c.Engine) + " не ответил: " + why + ")", err
 	}
 	if len(rs) > n {
 		rs = rs[:n]
 	}
-	return rs, nil
+	return rs, engineName(c.Engine), nil
+}
+
+// searchPrompt tells the model it can search, and with what.
+func searchPrompt(c searchConf) string {
+	return "\nПоиск в интернете включён (поисковик: " + engineName(c.Engine) + "): блок ```search\nзапрос\n``` - панель найдёт и пришлёт результаты " +
+		"(заголовок, адрес, отрывок) следующим сообщением, с пометкой, через какой поисковик они пришли.\n" +
+		"Ищи активно: свежие данные, версии, документация, тексты ошибок, всё, в чём не уверен, - сначала поиск, потом ответ со ссылками на найденное. " +
+		"Одно действие за ответ. Ссылки не выдумывай."
 }
 
 // getJSON fetches url (with the headers) into v.
@@ -241,10 +272,10 @@ func (s *Server) handleAISearch(w http.ResponseWriter, r *http.Request) {
 		writeJSON(w, map[string]any{"ok": false, "error": "пустой запрос"})
 		return
 	}
-	rs, err := searchWith(r.Context(), s.searchConf(), strings.TrimSpace(in.Q), 6)
+	rs, used, err := searchWith(r.Context(), s.searchConf(), strings.TrimSpace(in.Q), 6)
 	if err != nil {
-		writeJSON(w, map[string]any{"ok": false, "error": err.Error()})
+		writeJSON(w, map[string]any{"ok": false, "error": err.Error(), "engine": used})
 		return
 	}
-	writeJSON(w, map[string]any{"ok": true, "data": rs})
+	writeJSON(w, map[string]any{"ok": true, "data": rs, "engine": used})
 }