feat: save preference to config file

utils/config_manager.go

@@ -0,0 +1,83 @@
+package utils
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+type SaveToType = string
+
+const (
+	Original SaveToType = "original"
+	Custom   SaveToType = "custom"
+)
+
+type Preference struct {
+	SaveTo SaveToType  `json:"save_to"`
+	Path   string       `json:"path"`
+}
+
+type ConfigManager struct {
+	FilePath string
+}
+
+// NewConfigManager 创建一个新的配置管理器，自动适配不同操作系统的用户目录
+func NewConfigManager(filename string) (*ConfigManager, error) {
+	configDir, err := os.UserConfigDir() // 获取用户配置目录
+	if err != nil {
+		return nil, err
+	}
+
+	dirPath := filepath.Join(configDir, "ncmdump-gui")
+	err = os.MkdirAll(dirPath, os.ModePerm)
+	if err != nil {
+		return nil, err
+	}
+
+	filePath := filepath.Join(dirPath, filename)
+
+	configManager := &ConfigManager{FilePath: filePath}
+	// if not exist, create it with default value
+	if _, err := os.Stat(filePath); os.IsNotExist(err) {
+		defaultConfig := &Preference{
+			SaveTo: Original,
+			Path:   "",
+		}
+		configManager.Save(defaultConfig)
+	}
+	return &ConfigManager{FilePath: filePath}, nil
+}
+
+// Save 将配置保存到文件
+func (cm *ConfigManager) Save(preference *Preference) bool {
+	file, err := os.Create(cm.FilePath)
+	if err != nil {
+		return false
+	}
+	defer file.Close()
+
+	encoder := json.NewEncoder(file)
+	encoder.SetIndent("", "  ") // 格式化输出
+	err = encoder.Encode(preference)
+	return err == nil
+}
+
+// Load 从文件读取配置
+func (cm *ConfigManager) Load() *Preference {
+	file, err := os.Open(cm.FilePath)
+	if err != nil {
+		return nil
+	}
+	defer file.Close()
+
+	var preference *Preference = nil
+	decoder := json.NewDecoder(file)
+	err = decoder.Decode(&preference)
+	fmt.Println(preference)
+	if err != nil {
+		return nil
+	}
+	return preference
+}