feat(webp): add partial success to conversion

So we only keep images that couldn't be optimized and return the chapter

converter/converter_test.go

@@ -14,34 +14,46 @@ import (
 func TestConvertChapter(t *testing.T) {
 
 	testCases := []struct {
-		name           string
-		genTestChapter func(path string) (*manga.Chapter, error)
-		split          bool
-		expectFailure  []constant.ConversionFormat
+		name                 string
+		genTestChapter       func(path string) (*manga.Chapter, error)
+		split                bool
+		expectFailure        []constant.ConversionFormat
+		expectPartialSuccess []constant.ConversionFormat
 	}{
 		{
-			name:           "All split pages",
-			genTestChapter: genBigPages,
-			split:          true,
-			expectFailure:  []constant.ConversionFormat{},
+			name:                 "All split pages",
+			genTestChapter:       genHugePages,
+			split:                true,
+			expectFailure:        []constant.ConversionFormat{},
+			expectPartialSuccess: []constant.ConversionFormat{},
 		},
 		{
-			name:           "Big Pages, no split",
-			genTestChapter: genBigPages,
-			split:          false,
-			expectFailure:  []constant.ConversionFormat{constant.WebP},
+			name:                 "Big Pages, no split",
+			genTestChapter:       genHugePages,
+			split:                false,
+			expectFailure:        []constant.ConversionFormat{constant.WebP},
+			expectPartialSuccess: []constant.ConversionFormat{},
 		},
 		{
-			name:           "No split pages",
-			genTestChapter: genSmallPages,
-			split:          false,
-			expectFailure:  []constant.ConversionFormat{},
+			name:                 "No split pages",
+			genTestChapter:       genSmallPages,
+			split:                false,
+			expectFailure:        []constant.ConversionFormat{},
+			expectPartialSuccess: []constant.ConversionFormat{},
 		},
 		{
-			name:           "Mix of split and no split pages",
-			genTestChapter: genMixSmallBig,
-			split:          true,
-			expectFailure:  []constant.ConversionFormat{},
+			name:                 "Mix of split and no split pages",
+			genTestChapter:       genMixSmallBig,
+			split:                true,
+			expectFailure:        []constant.ConversionFormat{},
+			expectPartialSuccess: []constant.ConversionFormat{},
+		},
+		{
+			name:                 "Mix of Huge and small page",
+			genTestChapter:       genMixSmallHuge,
+			split:                false,
+			expectFailure:        []constant.ConversionFormat{},
+			expectPartialSuccess: []constant.ConversionFormat{constant.WebP},
 		},
 	}
 	// Load test genTestChapter from testdata
@@ -72,6 +84,10 @@ func TestConvertChapter(t *testing.T) {
 
 					convertedChapter, err := converter.ConvertChapter(chapter, quality, tc.split, progress)
 					if err != nil {
+						if convertedChapter != nil && slices.Contains(tc.expectPartialSuccess, converter.Format()) {
+							t.Logf("Partial success to convert genTestChapter: %v", err)
+							return
+						}
 						if slices.Contains(tc.expectFailure, converter.Format()) {
 							t.Logf("Expected failure to convert genTestChapter: %v", err)
 							return
@@ -85,6 +101,10 @@ func TestConvertChapter(t *testing.T) {
 						t.Fatalf("no pages were converted")
 					}
 
+					if len(convertedChapter.Pages) != len(chapter.Pages) {
+						t.Fatalf("converted chapter has different number of pages")
+					}
+
 					for _, page := range convertedChapter.Pages {
 						if page.Extension != ".webp" {
 							t.Errorf("page %d was not converted to webp format", page.Index)
@@ -96,7 +116,7 @@ func TestConvertChapter(t *testing.T) {
 	}
 }
 
-func genBigPages(path string) (*manga.Chapter, error) {
+func genHugePages(path string) (*manga.Chapter, error) {
 	file, err := os.Open(path)
 	if err != nil {
 		return nil, err
@@ -182,3 +202,32 @@ func genMixSmallBig(path string) (*manga.Chapter, error) {
 		Pages:    pages,
 	}, nil
 }
+
+func genMixSmallHuge(path string) (*manga.Chapter, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	var pages []*manga.Page
+	for i := 0; i < 10; i++ { // Assuming there are 5 pages for the test
+		img := image.NewRGBA(image.Rect(0, 0, 300, 2000*(i+1)))
+		buf := new(bytes.Buffer)
+		err := jpeg.Encode(buf, img, nil)
+		if err != nil {
+			return nil, err
+		}
+		page := &manga.Page{
+			Index:     uint16(i),
+			Contents:  buf,
+			Extension: ".jpg",
+		}
+		pages = append(pages, page)
+	}
+
+	return &manga.Chapter{
+		FilePath: path,
+		Pages:    pages,
+	}, nil
+}