feat(link-summ): improve YouTube summaries using oEmbed title/thumbnail hints; keep prompt link-only

internal/summarizer/openai.go

@@ -2,6 +2,7 @@ package summarizer
 
 import (
 	"context"
+	"encoding/json"
 	"io"
 	"net/http"
 	"net/url"
@@ -172,9 +173,42 @@ func (o *OpenAI) SummarizeLink(ctx context.Context, rawURL string) (string, erro
 	client := openai.NewClientWithConfig(cfg)
 
 	content := ""
+	title := ""
 	img := ""
+
+	lu, _ := url.Parse(rawURL)
+	host := strings.ToLower(lu.Host)
+	isYouTube := host == "www.youtube.com" || host == "youtube.com" || host == "m.youtube.com" || host == "youtu.be"
+
 	if isImageURL(rawURL) {
 		img = rawURL
+	} else if isYouTube {
+		// YouTube: try oEmbed for title + thumbnail
+		watchURL := rawURL
+		if host == "youtu.be" {
+			id := strings.TrimPrefix(lu.Path, "/")
+			watchURL = "https://www.youtube.com/watch?v=" + id
+		}
+		ctx2, cancel := context.WithTimeout(ctx, o.linkTimeout)
+		defer cancel()
+		oembed := "https://www.youtube.com/oembed?format=json&url=" + url.QueryEscape(watchURL)
+		req, _ := http.NewRequestWithContext(ctx2, http.MethodGet, oembed, nil)
+		if resp, err := http.DefaultClient.Do(req); err == nil {
+			func(){
+				defer resp.Body.Close()
+				if resp.StatusCode >= 200 && resp.StatusCode < 300 {
+					var oem struct{
+						Title string `json:"title"`
+						Thumb string `json:"thumbnail_url"`
+					}
+					if err := json.NewDecoder(resp.Body).Decode(&oem); err == nil {
+						if oem.Title != "" { title = oem.Title }
+						if oem.Thumb != "" { img = oem.Thumb }
+					}
+				}
+			}()
+		}
+		// No robust transcript grab here; rely on model generalization + title
 	} else if o.followLinks {
 		ctx2, cancel := context.WithTimeout(ctx, o.linkTimeout)
 		defer cancel()
@@ -192,14 +226,13 @@ func (o *OpenAI) SummarizeLink(ctx context.Context, rawURL string) (string, erro
 							if art, err := readability.FromReader(strings.NewReader(text), base); err == nil {
 								if at := strings.TrimSpace(art.TextContent); at != "" {
 									text = at
+									if title == "" && strings.TrimSpace(art.Title) != "" { title = strings.TrimSpace(art.Title) }
 								}
 							}
 						}
 						text = strings.ReplaceAll(text, "\r", "")
 						text = strings.TrimSpace(text)
-						if len(text) > 6000 {
+						if len(text) > 6000 { text = text[:6000] }
-							text = text[:6000]
-						}
 						content = text
 					}
 				}()
@@ -213,7 +246,9 @@ func (o *OpenAI) SummarizeLink(ctx context.Context, rawURL string) (string, erro
 	b := strings.Builder{}
 	b.WriteString("URL: ")
 	b.WriteString(rawURL)
-	b.WriteString("\n\n")
+	b.WriteString("\n")
+	if title != "" { b.WriteString("Title: "); b.WriteString(title); b.WriteString("\n") }
+	b.WriteString("\n")
 	if content != "" {
 		b.WriteString("Extracted content (may be truncated):\n")
 		b.WriteString(content)
@@ -239,17 +274,11 @@ func (o *OpenAI) SummarizeLink(ctx context.Context, rawURL string) (string, erro
 		},
 		MaxCompletionTokens: o.maxTokens,
 	}
-	if !reasoningLike {
+	if !reasoningLike { req.Temperature = 0.2 }
-		req.Temperature = 0.2
-	}
 
 	resp, err := client.CreateChatCompletion(ctx, req)
-	if err != nil {
+	if err != nil { return "", err }
-		return "", err
+	if len(resp.Choices) == 0 { return "", nil }
-	}
-	if len(resp.Choices) == 0 {
-		return "", nil
-	}
 	return strings.TrimSpace(resp.Choices[0].Message.Content), nil
 }