init commit

core/config_manager.go

@@ -0,0 +1,61 @@
+package core
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+// ConfigManager handles saving/loading VPN configs to disk.
+type ConfigManager struct {
+	configFilePath string
+}
+
+// NewConfigManager creates a new ConfigManager with config file under %APPDATA%/kettuRay.
+func NewConfigManager() (*ConfigManager, error) {
+	appData, err := os.UserConfigDir()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get app data dir: %w", err)
+	}
+
+	appDir := filepath.Join(appData, "kettuRay")
+	if err := os.MkdirAll(appDir, 0o755); err != nil {
+		return nil, fmt.Errorf("failed to create app dir: %w", err)
+	}
+
+	return &ConfigManager{
+		configFilePath: filepath.Join(appDir, "configs.json"),
+	}, nil
+}
+
+// LoadConfigs loads saved VPN configs from disk.
+func (m *ConfigManager) LoadConfigs() ([]VpnConfig, error) {
+	data, err := os.ReadFile(m.configFilePath)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return make([]VpnConfig, 0), nil
+		}
+		return nil, err
+	}
+
+	var configs []VpnConfig
+	if len(data) == 0 {
+		return make([]VpnConfig, 0), nil
+	}
+	if err := json.Unmarshal(data, &configs); err != nil {
+		fmt.Printf("Error parsing configs.json: %v\n", err)
+		// return empty slice but still error so app knows it failed
+		return make([]VpnConfig, 0), err
+	}
+	return configs, nil
+}
+
+// SaveConfigs writes VPN configs to disk.
+func (m *ConfigManager) SaveConfigs(configs []VpnConfig) error {
+	data, err := json.MarshalIndent(configs, "", "  ")
+	if err != nil {
+		return fmt.Errorf("failed to marshal configs: %w", err)
+	}
+	return os.WriteFile(m.configFilePath, data, 0o644)
+}