refactor: decompose gui.Application god object into focused services

Extract CardService (file I/O, persistence, card directory management) and
GenerationOrchestrator (audio/image/phonetics generation) from the 2852-line
Application struct. Application is now thin UI event-wiring. Also split all
functions over 50 lines into focused helpers throughout app.go.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 17 insertions, 88 deletions

diff --git a/internal/gui/persistence.go b/internal/gui/persistence.go
index 0919974..e97a379 100644
--- a/internal/gui/persistence.go
+++ b/internal/gui/persistence.go
@@ -2,110 +2,39 @@ package gui
 
 import (
 	"fmt"
-	"os"
-	"path/filepath"
-
-	"fyne.io/fyne/v2"
-
-	"codeberg.org/snonux/totalrecall/internal"
 )
 
-// ensureWordDirectoryAndMetadata creates a new card directory and writes word metadata.
+// ensureWordDirectoryAndMetadata creates a new card directory and writes word
+// metadata. Delegates to CardService.
 func (a *Application) ensureWordDirectoryAndMetadata(word string) (string, error) {
-	cardID := internal.GenerateCardID(word)
-	wordDir := filepath.Join(a.config.OutputDir, cardID)
-	if err := os.MkdirAll(wordDir, 0755); err != nil {
-		return "", fmt.Errorf("failed to create card directory: %w", err)
-	}
-
-	metadataFile := filepath.Join(wordDir, "word.txt")
-	if err := os.WriteFile(metadataFile, []byte(word), 0644); err != nil {
-		return "", fmt.Errorf("failed to save word metadata: %w", err)
-	}
-
-	return wordDir, nil
+	return a.getCardService().EnsureWordDirectoryAndMetadata(word)
 }
 
-// ensureCardDirectory ensures a card directory exists for the given word and returns its path.
+// ensureCardDirectory ensures a card directory exists for the given word.
+// Delegates to CardService.
 func (a *Application) ensureCardDirectory(word string) (string, error) {
-	wordDir := a.findCardDirectory(word)
-	if wordDir != "" {
-		return wordDir, nil
-	}
-
-	return a.ensureWordDirectoryAndMetadata(word)
+	return a.getCardService().EnsureCardDirectory(word)
 }
 
-// saveTranslation saves the current translation to a file.
+// saveTranslation saves the current translation to disk.
+// Delegates to CardService.
 func (a *Application) saveTranslation() {
-	if a.currentWord == "" || a.currentTranslation == "" {
-		return
-	}
-
-	wordDir := a.findCardDirectory(a.currentWord)
-	if wordDir == "" {
-		newWordDir, err := a.ensureWordDirectoryAndMetadata(a.currentWord)
-		if err != nil {
-			a.showError(err)
-			return
-		}
-		wordDir = newWordDir
-	}
-
-	translationFile := filepath.Join(wordDir, "translation.txt")
-	content := fmt.Sprintf("%s = %s\n", a.currentWord, a.currentTranslation)
-	if err := os.WriteFile(translationFile, []byte(content), 0644); err != nil {
-		a.showError(fmt.Errorf("failed to save translation: %w", err))
+	if err := a.getCardService().SaveTranslation(a.currentWord, a.currentTranslation); err != nil {
+		a.showError(err)
 	}
 }
 
-// saveImagePrompt saves the current image prompt to a file.
+// saveImagePrompt is retained for compatibility but is currently a no-op.
+// The image prompt is saved by the image generation callback when the image
+// is generated, so there is no need to save it separately here.
 func (a *Application) saveImagePrompt() {
-	// With timestamp-based card IDs, we can't update existing prompts.
-	// The prompt is saved when the image is generated.
-	// This function is kept for compatibility but does nothing.
+	// No-op: the prompt is saved as soon as it is generated via the callback.
 }
 
-// savePhoneticInfo saves the phonetic information to a file.
+// savePhoneticInfo saves the current phonetic information to disk.
+// Delegates to CardService.
 func (a *Application) savePhoneticInfo() {
-	phoneticText := a.currentPhonetic
-	if a.currentWord == "" || phoneticText == "" || phoneticText == "Failed to fetch phonetic information" {
-		return
-	}
-
-	wordDir := a.findCardDirectory(a.currentWord)
-	if wordDir == "" {
-		newWordDir, err := a.ensureWordDirectoryAndMetadata(a.currentWord)
-		if err != nil {
-			a.showError(err)
-			return
-		}
-		wordDir = newWordDir
-	}
-
-	phoneticFile := filepath.Join(wordDir, "phonetic.txt")
-	if err := os.WriteFile(phoneticFile, []byte(phoneticText), 0644); err != nil {
+	if err := a.getCardService().SavePhoneticInfo(a.currentWord, a.currentPhonetic); err != nil {
 		a.showError(fmt.Errorf("failed to save phonetic info: %w", err))
 	}
 }
-
-// loadPhoneticInfo loads phonetic information from a file if it exists.
-func (a *Application) loadPhoneticInfo(word string) {
-	wordDir := a.findCardDirectory(word)
-	if wordDir == "" {
-		return
-	}
-
-	phoneticFile := filepath.Join(wordDir, "phonetic.txt")
-	if data, err := os.ReadFile(phoneticFile); err == nil {
-		phoneticText := string(data)
-		a.currentPhonetic = phoneticText
-		fyne.Do(func() {
-			if phoneticText != "" {
-				a.audioPlayer.SetPhonetic(phoneticText)
-			} else {
-				a.audioPlayer.SetPhonetic("")
-			}
-		})
-	}
-}