Improve result modal and Envato previews

backend/services/cse.go

@@ -1,9 +1,11 @@
 package services
 
 import (
+	"encoding/base64"
 	"encoding/json"
 	"fmt"
 	"io"
+	"math/rand"
 	"net/http"
 	"net/url"
 	"os/exec"
@@ -63,6 +65,7 @@ func (s *SearchService) SearchMedia(queries []string, enabledPlatforms map[strin
 	var lastErr error
 
 	baseQueries := limitQueries(queries, 6)
+	shuffleStrings(baseQueries)
 	primaryQueries := baseQueries[:minInt(len(baseQueries), 3)]
 	runSearchPass := func(bases []string, onlyMissing bool) {
 		for _, base := range bases {
@@ -80,7 +83,9 @@ func (s *SearchService) SearchMedia(queries []string, enabledPlatforms map[strin
 				if onlyMissing && sourceCounts[collector.Name()] > 0 {
 					continue
 				}
-				for _, searchQuery := range collector.BuildQueries(base) {
+				searchQueries := collector.BuildQueries(base)
+				shuffleStrings(searchQueries)
+				for _, searchQuery := range searchQueries {
 					if sourceCounts[collector.Name()] >= collector.MaxResults() {
 						break
 					}
@@ -201,6 +206,7 @@ func (s *SearchService) enrichEnvato(result SearchResult) SearchResult {
 			extractJSONLDValue(html, "contentUrl"),
 			extractMetaContent(html, "twitter:player:stream"),
 			extractVideoPreviewURL(html),
+			extractEnvatoPreviewFromHydration(html),
 			deriveEnvatoPreviewFromThumbnail(pageThumbnail),
 			deriveEnvatoPreviewFromThumbnail(result.ThumbnailURL),
 		)
@@ -801,6 +807,45 @@ func deriveEnvatoPreviewFromThumbnail(thumbnail string) string {
 	return ""
 }
 
+func extractEnvatoPreviewFromHydration(html string) string {
+	encoded := extractWindowAssignedValue(html, "INITIAL_HYDRATION_DATA")
+	if encoded == "" {
+		return ""
+	}
+
+	decoded, err := base64.StdEncoding.DecodeString(encoded)
+	if err != nil {
+		return ""
+	}
+	urls := collectURLs(string(decoded))
+	return pickBestEnvatoPreviewURL(urls)
+}
+
+func extractWindowAssignedValue(html, variable string) string {
+	pattern := regexp.MustCompile(`window\.` + regexp.QuoteMeta(variable) + `\s*=\s*"([^"]+)"`)
+	matches := pattern.FindStringSubmatch(html)
+	if len(matches) == 2 {
+		return matches[1]
+	}
+	return ""
+}
+
+func pickBestEnvatoPreviewURL(urls []string) string {
+	for _, item := range urls {
+		lower := strings.ToLower(item)
+		if strings.Contains(lower, "video-previews.elements.envatousercontent.com") && strings.Contains(lower, "watermarked_preview") && strings.HasSuffix(lower, ".mp4") {
+			return item
+		}
+	}
+	for _, item := range urls {
+		lower := strings.ToLower(item)
+		if strings.Contains(lower, "envatousercontent.com") && strings.Contains(lower, "watermarked_preview") && strings.HasSuffix(lower, ".mp4") {
+			return item
+		}
+	}
+	return ""
+}
+
 func newBrowserRequest(method, target, accept string) (*http.Request, error) {
 	req, err := http.NewRequest(method, target, nil)
 	if err != nil {
@@ -867,6 +912,16 @@ func limitQueries(queries []string, limit int) []string {
 	return filtered
 }
 
+func shuffleStrings(values []string) {
+	if len(values) < 2 {
+		return
+	}
+	rng := rand.New(rand.NewSource(time.Now().UnixNano()))
+	rng.Shuffle(len(values), func(i, j int) {
+		values[i], values[j] = values[j], values[i]
+	})
+}
+
 func htmlUnescape(text string) string {
 	replacer := strings.NewReplacer("&amp;", "&", "&quot;", `"`, "&#39;", "'", "&lt;", "<", "&gt;", ">")
 	return replacer.Replace(text)

backend/services/cse_test.go

@@ -1,6 +1,7 @@
 package services
 
 import (
+	"encoding/base64"
 	"strings"
 	"testing"
 )
@@ -23,6 +24,16 @@ func TestDeriveEnvatoPreviewFromThumbnail(t *testing.T) {
 	}
 }
 
+func TestExtractEnvatoPreviewFromHydration(t *testing.T) {
+	payload := `{"contentUrl":"https://video-previews.elements.envatousercontent.com/example/watermarked_preview/watermarked_preview.mp4"}`
+	html := `<script>window.INITIAL_HYDRATION_DATA="` + base64.StdEncoding.EncodeToString([]byte(payload)) + `";window.INITIAL_HYDRATION_DATA_ENCODED=true;</script>`
+	got := extractEnvatoPreviewFromHydration(html)
+	want := "https://video-previews.elements.envatousercontent.com/example/watermarked_preview/watermarked_preview.mp4"
+	if got != want {
+		t.Fatalf("expected %q, got %q", want, got)
+	}
+}
+
 func TestIsUsefulGoogleVideoResultRejectsMusicResults(t *testing.T) {
 	result := SearchResult{
 		Title:   "Couple Friendly Sad Bgm Movie Best Bgm",

backend/services/ranker.go

@@ -2,9 +2,11 @@ package services
 
 import (
 	"fmt"
+	"math/rand"
 	"sort"
 	"strings"
 	"sync"
+	"time"
 )
 
 const GeminiFallbackReason = "Gemini Vision 응답이 부족해 키워드 기준으로 보강된 결과입니다."
@@ -193,6 +195,21 @@ func BuildFallbackRecommendations(ranked []SearchResult, limit int, reason strin
 	return fallback
 }
 
+func RandomizeTopRecommendations(items []AIRecommendation, window int) []AIRecommendation {
+	if len(items) < 2 || window < 2 {
+		return items
+	}
+
+	limit := min(window, len(items))
+	shuffled := make([]AIRecommendation, len(items))
+	copy(shuffled, items)
+	rng := rand.New(rand.NewSource(time.Now().UnixNano()))
+	rng.Shuffle(limit, func(i, j int) {
+		shuffled[i], shuffled[j] = shuffled[j], shuffled[i]
+	})
+	return shuffled
+}
+
 func MergeRecommendations(recommended []AIRecommendation, ranked []SearchResult, limit int) []AIRecommendation {
 	merged := make([]AIRecommendation, 0, min(limit, len(ranked)))
 	seen := map[string]bool{}