ai-media-hub/backend/services/gemini_test.go

package services

import (
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
	"time"
)

func TestTranslateQueryFallsBackToGoogleWithoutGeminiKey(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`[[["rainy city street","비 오는 도시 거리",null,null,1]],null,"ko"]`))
	}))
	defer server.Close()

	service := NewGeminiService("", "")
	service.Client = &http.Client{Timeout: 2 * time.Second}
	service.TranslateEndpoint = server.URL

	translated := service.TranslateQuery("비 오는 도시 거리")
	if translated != "rainy city street" {
		t.Fatalf("expected google fallback translation, got %q", translated)
	}
}

func TestTranslateQueryFallsBackToDictionaryWhenTranslateFails(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		http.Error(w, "boom", http.StatusBadGateway)
	}))
	defer server.Close()

	service := NewGeminiService("", "")
	service.Client = &http.Client{Timeout: 2 * time.Second}
	service.TranslateEndpoint = server.URL

	translated := service.TranslateQuery("숲속 커플")
	if translated != "forest couple" {
		t.Fatalf("expected dictionary fallback translation, got %q", translated)
	}
}

func TestTranslateSummaryToKoreanUsesGoogleAndCaches(t *testing.T) {
	requests := 0
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		requests++
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`[[["도시에서 웃는 커플","smiling couple in city",null,null,1]],null,"en"]`))
	}))
	defer server.Close()

	service := NewGeminiService("", "")
	service.Client = &http.Client{Timeout: 2 * time.Second}
	service.TranslateEndpoint = server.URL

	first, err := service.TranslateSummaryToKorean("smiling couple in city")
	if err != nil {
		t.Fatalf("expected translation to succeed, got error: %v", err)
	}
	second, err := service.TranslateSummaryToKorean("smiling couple in city")
	if err != nil {
		t.Fatalf("expected cached translation to succeed, got error: %v", err)
	}
	if first != "도시에서 웃는 커플" || second != first {
		t.Fatalf("unexpected translated summary values: %q %q", first, second)
	}
	if requests != 1 {
		t.Fatalf("expected one upstream translation request due to cache, got %d", requests)
	}
}

func TestNormalizeKnownMediaPhrases(t *testing.T) {
	translated := translateKoreanMediaTerms("사이버 펑크 도시")
	if translated != "cyberpunk city" {
		t.Fatalf("expected cyberpunk city, got %q", translated)
	}
}

func TestBuildSupplementalQueriesReturnsGeneratedLines(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`{"candidates":[{"content":{"parts":[{"text":"authentic couple city walk\ncandid couple park footage\nnatural lifestyle b-roll"}]}}]}`))
	}))
	defer server.Close()

	service := NewGeminiService("dummy-key", "")
	service.Client = &http.Client{Timeout: 2 * time.Second}
	service.GenerateEndpoint = server.URL

	queries, err := service.BuildSupplementalQueries("다정한 커플", []string{"friendly couple"}, []AIRecommendation{
		{Assessment: "irrelevant", SearchHint: "authentic lifestyle couple"},
	})
	if err != nil {
		t.Fatalf("expected supplemental query generation to succeed, got %v", err)
	}
	if len(queries) < 3 || queries[0] != "authentic couple city walk" {
		t.Fatalf("unexpected supplemental queries: %#v", queries)
	}
}

func TestExpandImageQueriesReturnsExactlyFiveEnglishQueries(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`{"candidates":[{"content":{"parts":[{"text":"{\"queries\":[\"funny cat\",\"funny cat gif\",\"cute cat reaction\",\"cat meme gif\",\"animated cat sticker\"]}"}]}}]}`))
	}))
	defer server.Close()

	service := NewGeminiService("dummy-key", "gemini-2.5-flash")
	service.Client = &http.Client{Timeout: 2 * time.Second}
	service.GenerateEndpoint = server.URL

	queries, err := service.ExpandImageQueries("웃긴 고양이")
	if err != nil {
		t.Fatalf("expected image query expansion to succeed, got %v", err)
	}
	if len(queries) != 5 {
		t.Fatalf("expected exactly 5 queries, got %#v", queries)
	}
	if queries[0] != "funny cat" || queries[4] != "animated cat sticker" {
		t.Fatalf("unexpected image queries: %#v", queries)
	}
}

func TestExpandImageQueriesFallsBackWhenGeminiFails(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		http.Error(w, "boom", http.StatusBadGateway)
	}))
	defer server.Close()

	service := NewGeminiService("dummy-key", "gemini-2.5-flash")
	service.Client = &http.Client{Timeout: 2 * time.Second}
	service.GenerateEndpoint = server.URL
	service.TranslateEndpoint = server.URL

	queries, err := service.ExpandImageQueries("happy dog")
	if err == nil {
		t.Fatal("expected fallback warning error when gemini expansion fails")
	}
	if len(queries) != 5 {
		t.Fatalf("expected fallback to still provide 5 queries, got %#v", queries)
	}
	if queries[0] != "happy dog" {
		t.Fatalf("expected original query to be preserved in fallback, got %#v", queries)
	}
}

func TestExpandImageQueriesAcceptsLoosePlainTextList(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`{"candidates":[{"content":{"parts":[{"text":"Here is the JSON requested\n1. cute cat\n2. cute cat gif\n3. cat reaction gif\n4. cat meme gif\n5. animated cat sticker"}]}}]}`))
	}))
	defer server.Close()

	service := NewGeminiService("dummy-key", "gemini-2.5-flash")
	service.Client = &http.Client{Timeout: 2 * time.Second}
	service.GenerateEndpoint = server.URL

	queries, err := service.ExpandImageQueries("고양이")
	if err != nil {
		t.Fatalf("expected loose plain-text list to be accepted, got %v", err)
	}
	if len(queries) != 5 || queries[0] != "cute cat" || queries[4] != "animated cat sticker" {
		t.Fatalf("unexpected loose parsed queries: %#v", queries)
	}
}

func TestSelectUnevaluatedCandidatesSkipsReviewedLinks(t *testing.T) {
	ranked := []SearchResult{
		{Link: "https://a.example"},
		{Link: "https://b.example"},
		{Link: "https://c.example"},
	}
	reviewed := map[string]bool{
		"https://a.example": true,
	}

	selected := SelectUnevaluatedCandidates(ranked, reviewed, 2)
	if len(selected) != 2 {
		t.Fatalf("expected 2 selected candidates, got %d", len(selected))
	}
	if selected[0].Link != "https://b.example" || selected[1].Link != "https://c.example" {
		t.Fatalf("unexpected selection order: %#v", selected)
	}
}

func TestRemainingGeminiCapacityShrinksWithReviewedItems(t *testing.T) {
	reviewed := []AIRecommendation{
		{Link: "https://a.example"},
		{Link: "https://b.example"},
	}
	if got := RemainingGeminiCapacity(reviewed); got != 14 {
		t.Fatalf("expected 14 remaining slots, got %d", got)
	}
}

func TestGeminiVisualCacheRoundTrip(t *testing.T) {
	service := NewGeminiService("", "")
	service.setCachedVisual("image\nhttps://example.com/thumb.jpg", "abc", "image/jpeg", time.Minute)

	data, mimeType, ok := service.getCachedVisual("image\nhttps://example.com/thumb.jpg")
	if !ok {
		t.Fatal("expected visual cache hit")
	}
	if data != "abc" || mimeType != "image/jpeg" {
		t.Fatalf("unexpected cached visual data: %q %q", data, mimeType)
	}
}

func TestGeminiTranslationCacheRoundTrip(t *testing.T) {
	service := NewGeminiService("", "")
	service.setCachedTranslation("비 오는 도시", "rainy city", time.Minute)

	value, ok := service.getCachedTranslation("비 오는 도시")
	if !ok {
		t.Fatal("expected translation cache hit")
	}
	if value != "rainy city" {
		t.Fatalf("unexpected translation cache value: %q", value)
	}
}

func TestGeminiExpansionCacheRoundTrip(t *testing.T) {
	service := NewGeminiService("", "")
	service.setCachedExpansion("city rain", []string{"city rain", "city rain stock footage"}, time.Minute)

	value, ok := service.getCachedExpansion("city rain")
	if !ok {
		t.Fatal("expected expansion cache hit")
	}
	if len(value) != 2 || value[1] != "city rain stock footage" {
		t.Fatalf("unexpected expansion cache value: %#v", value)
	}
}

func TestDecorateRecommendationMediaUsesEmbedForGoogleVideo(t *testing.T) {
	item := DecorateRecommendationMedia(AIRecommendation{
		Source:       "Google Video",
		Link:         "https://www.youtube.com/watch?v=dQw4w9WgXcQ",
		ThumbnailURL: "https://i.ytimg.com/vi/dQw4w9WgXcQ/hqdefault.jpg",
	})
	if item.MediaMode != "thumbnail" {
		t.Fatalf("expected thumbnail media mode, got %q", item.MediaMode)
	}
	if item.EmbedURL == "" || !strings.Contains(item.EmbedURL, "youtube-nocookie.com/embed/") {
		t.Fatalf("unexpected embed url: %q", item.EmbedURL)
	}
	if item.ActionType != "download" || item.ActionLabel != "Direct Download" {
		t.Fatalf("unexpected Google Video actions: %#v", item)
	}
}

func TestRankSearchResultsPrefersUsableVisuals(t *testing.T) {
	results := []SearchResult{
		{Title: "cyberpunk city", Link: "https://example.com/a", ThumbnailURL: "https://example.com/favicon.ico"},
		{Title: "cyberpunk city", Link: "https://example.com/b", ThumbnailURL: "https://example.com/frame.jpg"},
	}
	ranked := RankSearchResults("cyberpunk city", results)
	if ranked[0].Link != "https://example.com/b" {
		t.Fatalf("expected usable thumbnail result first, got %#v", ranked)
	}
}

func TestMergeRecommendationsExcludesIrrelevantAndPendingFiller(t *testing.T) {
	recommended := []AIRecommendation{
		{Title: "keep", Link: "https://a.example", Recommended: true, Assessment: "positive", ThumbnailURL: "https://example.com/a.jpg"},
		{Title: "drop", Link: "https://b.example", Recommended: false, Assessment: "irrelevant", ThumbnailURL: "https://example.com/b.jpg", Reason: "관련이 없습니다."},
	}
	ranked := []SearchResult{
		{Title: "keep", Link: "https://a.example", ThumbnailURL: "https://example.com/a.jpg"},
		{Title: "extra", Link: "https://c.example", ThumbnailURL: "https://example.com/c.jpg"},
	}

	merged := MergeRecommendations(recommended, ranked, 16)
	if len(merged) != 1 {
		t.Fatalf("expected only the positive recommendation without pending filler, got %#v", merged)
	}
	if merged[0].Link != "https://a.example" {
		t.Fatalf("unexpected merged result: %#v", merged)
	}
}