1 files changed, 130 insertions, 0 deletions
diff --git a/internal/gui/parallel_runner.go b/internal/gui/parallel_runner.go
new file mode 100644
index 0000000..2567304
--- /dev/null
+++ b/internal/gui/parallel_runner.go
@@ -0,0 +1,130 @@
+package gui
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+// GenerateResult holds the outcome of a parallel generation run.
+type GenerateResult struct {
+	AudioFile     string
+	AudioFileBack string
+	ImageFile     string
+	PhoneticInfo  string
+}
+
+// audioGenResult is an internal channel payload for audio goroutines.
+type audioGenResult struct {
+	file     string
+	fileBack string
+	err      error
+}
+
+// imageGenResult is an internal channel payload for image goroutines.
+type imageGenResult struct {
+	file string
+	err  error
+}
+
+// phoneticGenResult is an internal channel payload for phonetic goroutines.
+type phoneticGenResult struct {
+	info string
+	err  error
+}
+
+// ParallelRunner coordinates parallel audio, image, and phonetics work for
+// material generation. It is stateless; the orchestrator supplies all behaviour
+// via the first method argument.
+type ParallelRunner struct{}
+
+// GenerateMaterials generates audio, image, and phonetics in parallel for a
+// word. translation is the existing translation (may be empty). isBgBg flags
+// bg-bg card type. imagePrompt is an optional custom prompt; imageTranslation
+// is the translation hint for image prompts.
+// The promptUI callback is called on the generating goroutine when the image
+// prompt becomes known so callers can update the UI.
+// Returns a GenerateResult or an error if any mandatory step fails.
+func (ParallelRunner) GenerateMaterials(
+	o *GenerationOrchestrator,
+	ctx context.Context,
+	word, translation, cardDir string,
+	isBgBg bool,
+	imagePrompt string,
+	promptUI func(prompt string),
+) (GenerateResult, error) {
+	audioChan := make(chan audioGenResult, 1)
+	imageChan := make(chan imageGenResult, 1)
+	phoneticChan := make(chan phoneticGenResult, 1)
+
+	// 1. Audio generation
+	go func() {
+		var audioFile, audioFileBack string
+		var err error
+
+		if isBgBg && translation != "" {
+			audioFile, audioFileBack, err = o.GenerateAudioBgBg(ctx, word, translation, cardDir)
+		} else {
+			audioFile, err = o.GenerateAudio(ctx, word, cardDir)
+		}
+
+		audioChan <- audioGenResult{file: audioFile, fileBack: audioFileBack, err: err}
+	}()
+
+	// 2. Image generation (includes scene description from the AI)
+	go func() {
+		imageFile, err := o.generateImagesWithPromptAndNotify(ctx, word, imagePrompt, translation, cardDir, promptUI)
+		imageChan <- imageGenResult{file: imageFile, err: err}
+	}()
+
+	// 3. Phonetic information fetching
+	go func() {
+		phoneticInfo, err := o.GetPhoneticInfo(word)
+		if err != nil {
+			fmt.Printf("Warning: Failed to get phonetic info: %v\n", err)
+			phoneticInfo = "Failed to fetch phonetic information"
+		} else {
+			fmt.Printf("Successfully fetched phonetic info for '%s': %s\n", word, phoneticInfo)
+		}
+
+		savePhoneticIfValid(phoneticInfo, cardDir, word)
+		phoneticChan <- phoneticGenResult{info: phoneticInfo}
+	}()
+
+	// Collect results.
+	audioRes := <-audioChan
+	if audioRes.err != nil {
+		// Drain remaining channels to avoid goroutine leaks.
+		<-imageChan
+		<-phoneticChan
+		return GenerateResult{}, fmt.Errorf("audio generation failed: %w", audioRes.err)
+	}
+
+	imageRes := <-imageChan
+	if imageRes.err != nil {
+		<-phoneticChan
+		return GenerateResult{}, fmt.Errorf("image download failed: %w", imageRes.err)
+	}
+
+	phoneticRes := <-phoneticChan
+
+	return GenerateResult{
+		AudioFile:     audioRes.file,
+		AudioFileBack: audioRes.fileBack,
+		ImageFile:     imageRes.file,
+		PhoneticInfo:  phoneticRes.info,
+	}, nil
+}
+
+// savePhoneticIfValid saves phonetic info to disk when the info is valid.
+func savePhoneticIfValid(phoneticInfo, cardDir, word string) {
+	if phoneticInfo == "" || phoneticInfo == "Failed to fetch phonetic information" {
+		return
+	}
+
+	phoneticFile := filepath.Join(cardDir, "phonetic.txt")
+	if err := os.WriteFile(phoneticFile, []byte(phoneticInfo), 0644); err != nil {
+		fmt.Printf("Warning: Failed to save phonetic info for '%s': %v\n", word, err)
+	}
+}