feat: Refactor of Go backend code

app_settings.go

@@ -0,0 +1,100 @@
+// Package main provides settings import/export functionality for EMLy.
+// This file contains methods for exporting and importing application settings
+// as JSON files.
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/wailsapp/wails/v2/pkg/runtime"
+)
+
+// =============================================================================
+// Settings Export/Import Methods
+// =============================================================================
+
+// ExportSettings opens a save dialog and exports the provided settings JSON
+// to the selected file location.
+//
+// The dialog is pre-configured with:
+//   - Default filename: emly_settings.json
+//   - Filter for JSON files
+//
+// Parameters:
+//   - settingsJSON: The JSON string containing all application settings
+//
+// Returns:
+//   - string: The path where settings were saved, or empty if cancelled
+//   - error: Error if dialog or file operations fail
+func (a *App) ExportSettings(settingsJSON string) (string, error) {
+	// Open save dialog with JSON filter
+	savePath, err := runtime.SaveFileDialog(a.ctx, runtime.SaveDialogOptions{
+		DefaultFilename: "emly_settings.json",
+		Title:           "Export Settings",
+		Filters: []runtime.FileFilter{
+			{
+				DisplayName: "JSON Files (*.json)",
+				Pattern:     "*.json",
+			},
+		},
+	})
+	if err != nil {
+		return "", fmt.Errorf("failed to open save dialog: %w", err)
+	}
+
+	// User cancelled
+	if savePath == "" {
+		return "", nil
+	}
+
+	// Ensure .json extension
+	if !strings.HasSuffix(strings.ToLower(savePath), ".json") {
+		savePath += ".json"
+	}
+
+	// Write the settings file
+	if err := os.WriteFile(savePath, []byte(settingsJSON), 0644); err != nil {
+		return "", fmt.Errorf("failed to write settings file: %w", err)
+	}
+
+	return savePath, nil
+}
+
+// ImportSettings opens a file dialog for the user to select a settings JSON file
+// and returns its contents.
+//
+// The dialog is configured to only show JSON files.
+//
+// Returns:
+//   - string: The JSON content of the selected file, or empty if cancelled
+//   - error: Error if dialog or file operations fail
+func (a *App) ImportSettings() (string, error) {
+	// Open file dialog with JSON filter
+	openPath, err := runtime.OpenFileDialog(a.ctx, runtime.OpenDialogOptions{
+		Title: "Import Settings",
+		Filters: []runtime.FileFilter{
+			{
+				DisplayName: "JSON Files (*.json)",
+				Pattern:     "*.json",
+			},
+		},
+	})
+	if err != nil {
+		return "", fmt.Errorf("failed to open file dialog: %w", err)
+	}
+
+	// User cancelled
+	if openPath == "" {
+		return "", nil
+	}
+
+	// Read the settings file
+	data, err := os.ReadFile(openPath)
+	if err != nil {
+		return "", fmt.Errorf("failed to read settings file: %w", err)
+	}
+
+	return string(data), nil
+}