Remove audio cache feature to simplify codebase and avoid cache-related issues

🤖 Generated with [opencode](https://opencode.ai)

Co-Authored-By: opencode <noreply@opencode.ai>

7 files changed, 6 insertions, 327 deletions

diff --git a/config.yaml.example b/config.yaml.example
index b5c7cbd..3988035 100644
--- a/config.yaml.example
+++ b/config.yaml.example
@@ -22,10 +22,6 @@ audio:
   # openai_instruction: "Speak in Bulgarian (not Russian!). Use native Bulgarian pronunciation with clear articulation for each syllable."
   # openai_instruction: "You are a Bulgarian language teacher. Pronounce the Bulgarian words slowly with authentic Bulgarian accent and phonetics."
   # openai_instruction: "Speak Bulgarian text with proper Bulgarian pronunciation. Avoid Russian accent. Speak clearly at a pace suitable for beginners."
-  
-  # Caching
-  enable_cache: true
-  cache_dir: ./.audio_cache
 
 # Image configuration
 image:
diff --git a/internal/audio/openai_provider.go b/internal/audio/openai_provider.go
index 0f3a0ad..3c2a22d 100644
--- a/internal/audio/openai_provider.go
+++ b/internal/audio/openai_provider.go
@@ -2,8 +2,6 @@ package audio
 
 import (
 	"context"
-	"crypto/md5"
-	"encoding/hex"
 	"fmt"
 	"io"
 	"os"
@@ -15,10 +13,8 @@ import (
 
 // OpenAIProvider implements Provider interface for OpenAI TTS
 type OpenAIProvider struct {
-	client      *openai.Client
-	config      *Config
-	cacheDir    string
-	enableCache bool
+	client *openai.Client
+	config *Config
 }
 
 // NewOpenAIProvider creates a new OpenAI TTS provider
@@ -30,17 +26,8 @@ func NewOpenAIProvider(config *Config) (Provider, error) {
 	client := openai.NewClient(config.OpenAIKey)
 
 	provider := &OpenAIProvider{
-		client:      client,
-		config:      config,
-		cacheDir:    config.CacheDir,
-		enableCache: config.EnableCache,
-	}
-
-	// Create cache directory if caching is enabled
-	if provider.enableCache && provider.cacheDir != "" {
-		if err := os.MkdirAll(provider.cacheDir, 0755); err != nil {
-			return nil, fmt.Errorf("failed to create cache directory: %w", err)
-		}
+		client: client,
+		config: config,
 	}
 
 	return provider, nil
@@ -53,15 +40,6 @@ func (p *OpenAIProvider) GenerateAudio(ctx context.Context, text string, outputF
 		return err
 	}
 
-	// Check cache first
-	if p.enableCache {
-		cacheFile := p.getCacheFilePath(text)
-		if _, err := os.Stat(cacheFile); err == nil {
-			// Cache hit - copy cached file
-			return p.copyFile(cacheFile, outputFile)
-		}
-	}
-
 	// Preprocess text for clearer Bulgarian pronunciation
 	processedText := p.preprocessBulgarianText(text)
 
@@ -142,12 +120,6 @@ func (p *OpenAIProvider) GenerateAudio(ctx context.Context, text string, outputF
 		return fmt.Errorf("no audio data received from OpenAI")
 	}
 
-	// Cache the result if caching is enabled
-	if p.enableCache {
-		cacheFile := p.getCacheFilePath(text)
-		_ = p.copyFile(outputFile, cacheFile) // Ignore cache errors
-	}
-
 	return nil
 }
 
@@ -187,78 +159,3 @@ func (p *OpenAIProvider) preprocessBulgarianText(text string) string {
 
 	return processedText
 }
-
-// getCacheFilePath generates a cache file path for the given text
-func (p *OpenAIProvider) getCacheFilePath(text string) string {
-	// Create a hash of the text and settings
-	h := md5.New()
-	h.Write([]byte(text))
-	h.Write([]byte(p.config.OpenAIModel))
-	h.Write([]byte(p.config.OpenAIVoice))
-	h.Write([]byte(fmt.Sprintf("%.2f", p.config.OpenAISpeed)))
-	// Include instruction in cache key for gpt-4o-mini-tts
-	if p.config.OpenAIModel == "gpt-4o-mini-tts" && p.config.OpenAIInstruction != "" {
-		h.Write([]byte(p.config.OpenAIInstruction))
-	}
-	hash := hex.EncodeToString(h.Sum(nil))
-
-	// Use first 2 chars as subdirectory for better file system performance
-	subdir := hash[:2]
-	filename := hash[2:] + ".mp3"
-
-	return filepath.Join(p.cacheDir, subdir, filename)
-}
-
-// copyFile copies a file from src to dst
-func (p *OpenAIProvider) copyFile(src, dst string) error {
-	// Ensure destination directory exists
-	dir := filepath.Dir(dst)
-	if dir != "" && dir != "." {
-		if err := os.MkdirAll(dir, 0755); err != nil {
-			return err
-		}
-	}
-
-	source, err := os.Open(src)
-	if err != nil {
-		return err
-	}
-	defer source.Close()
-
-	destination, err := os.Create(dst)
-	if err != nil {
-		return err
-	}
-	defer destination.Close()
-
-	_, err = io.Copy(destination, source)
-	return err
-}
-
-// ClearCache removes all cached audio files
-func (p *OpenAIProvider) ClearCache() error {
-	if p.cacheDir == "" {
-		return nil
-	}
-	return os.RemoveAll(p.cacheDir)
-}
-
-// GetCacheStats returns cache statistics
-func (p *OpenAIProvider) GetCacheStats() (fileCount int, totalSize int64, err error) {
-	if !p.enableCache || p.cacheDir == "" {
-		return 0, 0, nil
-	}
-
-	err = filepath.Walk(p.cacheDir, func(path string, info os.FileInfo, err error) error {
-		if err != nil {
-			return err
-		}
-		if !info.IsDir() {
-			fileCount++
-			totalSize += info.Size()
-		}
-		return nil
-	})
-
-	return fileCount, totalSize, err
-}
diff --git a/internal/audio/openai_provider_test.go b/internal/audio/openai_provider_test.go
index 7e3f9e5..ae16ca0 100644
--- a/internal/audio/openai_provider_test.go
+++ b/internal/audio/openai_provider_test.go
@@ -2,8 +2,6 @@ package audio
 
 import (
 	"context"
-	"os"
-	"path/filepath"
 	"strings"
 	"testing"
 )
@@ -24,19 +22,9 @@ func TestNewOpenAIProvider(t *testing.T) {
 			errMsg:  "OpenAI API key is required",
 		},
 		{
-			name: "valid config with cache",
+			name: "valid config",
 			config: &Config{
-				OpenAIKey:   "test-key",
-				EnableCache: true,
-				CacheDir:    "./test_cache",
-			},
-			wantErr: false,
-		},
-		{
-			name: "valid config without cache",
-			config: &Config{
-				OpenAIKey:   "test-key",
-				EnableCache: false,
+				OpenAIKey: "test-key",
 			},
 			wantErr: false,
 		},
@@ -52,11 +40,6 @@ func TestNewOpenAIProvider(t *testing.T) {
 				t.Errorf("NewOpenAIProvider() error = %v, want %v", err.Error(), tt.errMsg)
 			}
 
-			// Cleanup cache dir if created
-			if !tt.wantErr && tt.config.EnableCache && tt.config.CacheDir != "" {
-				os.RemoveAll(tt.config.CacheDir)
-			}
-
 			// Check provider properties
 			if !tt.wantErr && provider != nil {
 				if provider.Name() != "openai" {
@@ -149,180 +132,6 @@ func TestPreprocessBulgarianText(t *testing.T) {
 	}
 }
 
-func TestGetCacheFilePath(t *testing.T) {
-	provider := &OpenAIProvider{
-		config: &Config{
-			OpenAIModel: "tts-1",
-			OpenAIVoice: "alloy",
-			OpenAISpeed: 1.0,
-		},
-		cacheDir: "./test_cache",
-	}
-
-	// Test basic cache path generation
-	path1 := provider.getCacheFilePath("ябълка")
-	if !strings.HasPrefix(path1, "test_cache/") {
-		t.Errorf("Cache path should start with cache dir, got %s", path1)
-	}
-	if !strings.HasSuffix(path1, ".mp3") {
-		t.Errorf("Cache path should end with .mp3, got %s", path1)
-	}
-
-	// Test that same input produces same path
-	path2 := provider.getCacheFilePath("ябълка")
-	if path1 != path2 {
-		t.Errorf("Same input should produce same cache path, got %s and %s", path1, path2)
-	}
-
-	// Test that different input produces different path
-	path3 := provider.getCacheFilePath("котка")
-	if path1 == path3 {
-		t.Errorf("Different input should produce different cache path")
-	}
-
-	// Test that different settings produce different paths
-	provider.config.OpenAIVoice = "nova"
-	path4 := provider.getCacheFilePath("ябълка")
-	if path1 == path4 {
-		t.Errorf("Different voice should produce different cache path")
-	}
-
-	// Test with instruction for gpt-4o-mini-tts
-	provider.config.OpenAIModel = "gpt-4o-mini-tts"
-	provider.config.OpenAIInstruction = "Test instruction"
-	path5 := provider.getCacheFilePath("ябълка")
-
-	provider.config.OpenAIInstruction = "Different instruction"
-	path6 := provider.getCacheFilePath("ябълка")
-	if path5 == path6 {
-		t.Errorf("Different instruction should produce different cache path for gpt-4o-mini-tts")
-	}
-}
-
-func TestCopyFile(t *testing.T) {
-	// Create a temporary directory for testing
-	tempDir := t.TempDir()
-
-	provider := &OpenAIProvider{}
-
-	// Create source file
-	srcPath := filepath.Join(tempDir, "source.txt")
-	srcContent := []byte("test content")
-	if err := os.WriteFile(srcPath, srcContent, 0644); err != nil {
-		t.Fatalf("Failed to create source file: %v", err)
-	}
-
-	// Test copying to new file
-	dstPath := filepath.Join(tempDir, "dest.txt")
-	err := provider.copyFile(srcPath, dstPath)
-	if err != nil {
-		t.Errorf("copyFile() error = %v", err)
-	}
-
-	// Verify content
-	dstContent, err := os.ReadFile(dstPath)
-	if err != nil {
-		t.Fatalf("Failed to read destination file: %v", err)
-	}
-	if string(dstContent) != string(srcContent) {
-		t.Errorf("Copied content doesn't match: got %q, want %q", dstContent, srcContent)
-	}
-
-	// Test copying to subdirectory
-	dstPath2 := filepath.Join(tempDir, "subdir", "dest2.txt")
-	err = provider.copyFile(srcPath, dstPath2)
-	if err != nil {
-		t.Errorf("copyFile() to subdirectory error = %v", err)
-	}
-
-	// Test copying non-existent file
-	err = provider.copyFile(filepath.Join(tempDir, "nonexistent.txt"), dstPath)
-	if err == nil {
-		t.Error("copyFile() expected error for non-existent source")
-	}
-}
-
-func TestClearCache(t *testing.T) {
-	tempDir := t.TempDir()
-
-	provider := &OpenAIProvider{
-		cacheDir: filepath.Join(tempDir, "cache"),
-	}
-
-	// Create cache directory with some files
-	os.MkdirAll(filepath.Join(provider.cacheDir, "ab"), 0755)
-	os.WriteFile(filepath.Join(provider.cacheDir, "ab", "test1.mp3"), []byte("data1"), 0644)
-	os.WriteFile(filepath.Join(provider.cacheDir, "ab", "test2.mp3"), []byte("data2"), 0644)
-
-	// Clear cache
-	err := provider.ClearCache()
-	if err != nil {
-		t.Errorf("ClearCache() error = %v", err)
-	}
-
-	// Verify cache directory is gone
-	if _, err := os.Stat(provider.cacheDir); !os.IsNotExist(err) {
-		t.Error("Cache directory should be removed")
-	}
-
-	// Test clearing with empty cache dir
-	provider.cacheDir = ""
-	err = provider.ClearCache()
-	if err != nil {
-		t.Errorf("ClearCache() with empty dir should not error: %v", err)
-	}
-}
-
-func TestGetCacheStats(t *testing.T) {
-	tempDir := t.TempDir()
-
-	provider := &OpenAIProvider{
-		enableCache: true,
-		cacheDir:    filepath.Join(tempDir, "cache"),
-	}
-
-	// Create the cache directory first
-	os.MkdirAll(provider.cacheDir, 0755)
-
-	// Test with no cache files
-	count, size, err := provider.GetCacheStats()
-	if err != nil {
-		t.Errorf("GetCacheStats() error = %v", err)
-	}
-	if count != 0 || size != 0 {
-		t.Errorf("Expected empty cache stats, got count=%d, size=%d", count, size)
-	}
-	// Create cache files
-	os.MkdirAll(filepath.Join(provider.cacheDir, "ab"), 0755)
-	data1 := []byte("test data 1")
-	data2 := []byte("test data 22")
-	os.WriteFile(filepath.Join(provider.cacheDir, "ab", "test1.mp3"), data1, 0644)
-	os.WriteFile(filepath.Join(provider.cacheDir, "ab", "test2.mp3"), data2, 0644)
-
-	// Get stats
-	count, size, err = provider.GetCacheStats()
-	if err != nil {
-		t.Errorf("GetCacheStats() error = %v", err)
-	}
-	if count != 2 {
-		t.Errorf("Expected 2 files, got %d", count)
-	}
-	expectedSize := int64(len(data1) + len(data2))
-	if size != expectedSize {
-		t.Errorf("Expected size %d, got %d", expectedSize, size)
-	}
-
-	// Test with cache disabled
-	provider.enableCache = false
-	count, size, err = provider.GetCacheStats()
-	if err != nil {
-		t.Errorf("GetCacheStats() with cache disabled error = %v", err)
-	}
-	if count != 0 || size != 0 {
-		t.Errorf("Expected zero stats with cache disabled, got count=%d, size=%d", count, size)
-	}
-}
-
 func TestGenerateAudioValidation(t *testing.T) {
 	provider := &OpenAIProvider{
 		config: &Config{
diff --git a/internal/audio/provider.go b/internal/audio/provider.go
index 0142fb3..06894bf 100644
--- a/internal/audio/provider.go
+++ b/internal/audio/provider.go
@@ -30,9 +30,6 @@ type Config struct {
 	OpenAISpeed       float64 // 0.25 to 4.0
 	OpenAIInstruction string  // Voice instructions for gpt-4o-mini-tts model
 
-	// Caching settings
-	EnableCache bool
-	CacheDir    string
 }
 
 // DefaultConfig returns default configuration
@@ -46,8 +43,6 @@ func DefaultProviderConfig() *Config {
 		OpenAISpeed:  1.0,
 		// OpenAISpeed:       0.98, // Default speed for clarity
 		OpenAIInstruction: "You are speaking Bulgarian language (български език). Pronounce the Bulgarian text with authentic Bulgarian phonetics, not Russian. Speak slowly and clearly for language learners.",
-		EnableCache:       true,
-		CacheDir:          "./.audio_cache",
 	}
 }
 
diff --git a/internal/audio/provider_test.go b/internal/audio/provider_test.go
index 7fda932..97d3e9c 100644
--- a/internal/audio/provider_test.go
+++ b/internal/audio/provider_test.go
@@ -50,13 +50,6 @@ func TestDefaultProviderConfig(t *testing.T) {
 		t.Errorf("Expected OpenAI speed 1.0, got %f", config.OpenAISpeed)
 	}
 
-	if !config.EnableCache {
-		t.Error("Expected cache to be enabled by default")
-	}
-
-	if config.CacheDir != "./.audio_cache" {
-		t.Errorf("Expected cache dir './.audio_cache', got '%s'", config.CacheDir)
-	}
 }
 
 func TestNewProvider(t *testing.T) {
diff --git a/internal/gui/app.go b/internal/gui/app.go
index cd4b711..6a58286 100644
--- a/internal/gui/app.go
+++ b/internal/gui/app.go
@@ -170,8 +170,6 @@ func New(config *Config) *Application {
 		OpenAIVoice:       "nova",
 		OpenAISpeed:       0.9,
 		OpenAIInstruction: "You are speaking Bulgarian language (български език). Pronounce the Bulgarian text with authentic Bulgarian phonetics, not Russian. Speak slowly and clearly for language learners.",
-		EnableCache:       true,
-		CacheDir:          "./.audio_cache",
 	}
 
 	app.setupUI()
diff --git a/internal/processor/processor.go b/internal/processor/processor.go
index 43e75ca..1e1c20f 100644
--- a/internal/processor/processor.go
+++ b/internal/processor/processor.go
@@ -263,15 +263,6 @@ func (p *Processor) generateAudioWithVoice(word, voice string) error {
 		OpenAIVoice:       voice,
 		OpenAISpeed:       speed,
 		OpenAIInstruction: p.flags.OpenAIInstruction,
-
-		// Caching
-		EnableCache: viper.GetBool("audio.enable_cache"),
-		CacheDir:    viper.GetString("audio.cache_dir"),
-	}
-
-	// Set defaults
-	if providerConfig.CacheDir == "" {
-		providerConfig.CacheDir = "./.audio_cache"
 	}
 
 	// Use config file values if not overridden by flags