feat(config): improve config saving and error handling

config/config.go

@@ -83,8 +83,18 @@ func LoadConfig() (*Config, error) {
 }
 
 func SaveConfig(config *Config) error {
-	viper.Set("moneybird.token", config.Moneybird.Token)
-	viper.Set("gmail.token", config.Gmail.Token)
-	viper.Set("app.last_update", config.App.LastUpdate)
-	return viper.WriteConfig()
-}
+    viper.Set("moneybird.token", config.Moneybird.Token)
+    viper.Set("gmail.token", config.Gmail.Token)
+    viper.Set("app.last_update", config.App.LastUpdate)
+
+    if err := viper.WriteConfig(); err != nil {
+        return fmt.Errorf("writing config: %w", err)
+    }
+
+    // Force viper to read the config file again
+    if err := viper.ReadInConfig(); err != nil {
+        return fmt.Errorf("reloading config: %w", err)
+    }
+
+    return nil
+}

internal/processor/email_processor.go

@@ -46,7 +46,13 @@ func (p *EmailProcessor) ProcessEmails(ctx context.Context) ([]gmail.Email, erro
 }
 
 func (p *EmailProcessor) UpdateLastProcessed(email gmail.Email) error {
-	p.lastUpdate = email.Date.Add(time.Second)
-	p.cfg.App.LastUpdate = p.lastUpdate.Format(time.RFC3339)
-	return config.SaveConfig(p.cfg)
+   p.lastUpdate = email.Date.Add(time.Second)
+   p.cfg.App.LastUpdate = p.lastUpdate.Format(time.RFC3339)
+
+   if err := config.SaveConfig(p.cfg); err != nil {
+	   return fmt.Errorf("failed to save config: %w", err)
+   }
+
+   log.Printf("Updated last processed time to: %v", p.lastUpdate.Format(time.RFC3339))
+   return nil
 }