Added ability to import and export town/city settings

main.go

@@ -5,6 +5,7 @@ import (
 	"archive/zip"
 	"bytes"
 	"compress/gzip"
+	"encoding/json"
 	"fmt"
 	"image"
 	"image/color"
@@ -806,6 +807,7 @@ func main() {
 	}
 
 	// Create UI elements for error display and action buttons
+	var applySettingsToUI func(*Settings)
 	errorLabel := widget.NewLabel("")
 	errorLabel.Wrapping = fyne.TextWrapWord
 	errorLabel.Hide()
@@ -825,6 +827,12 @@ func main() {
 	exportMasksBtn := widget.NewButton("Export Masks", func() {
 		showMasksSaveDialog(w, canvasImg.Image, heightmapImg.Image, bumpmapImg.Image, settings, lakes, riverMask, treeMask, roadMask, bridgeMask, wallMask, turretMask, buildingMask)
 	})
+	exportSettingsBtn := widget.NewButton("Export Settings", func() {
+		showSettingsExportDialog(w, settings)
+	})
+	importSettingsBtn := widget.NewButton("Import Settings", func() {
+		showSettingsImportDialog(w, settings, applySettingsToUI)
+	})
 	// Main generation button and logic
 	generateBtn = widget.NewButton("Generate", func() {
 		go func() {
@@ -1465,6 +1473,82 @@ func main() {
 		ratioContainer.Hide()
 	}
 
+	applySettingsToUI = func(imported *Settings) {
+		lastExportPath := settings.LastExportPath
+		imageViewState := settings.ImageViewState
+
+		*settings = *imported
+		settings.LastExportPath = lastExportPath
+		settings.ImageViewState = imageViewState
+		if settings.BuildingShapeRatios == nil {
+			settings.BuildingShapeRatios = map[string]float64{
+				"squares":    40,
+				"circles":    30,
+				"rectangles": 30,
+			}
+		}
+
+		widthEntry.SetText(strconv.Itoa(settings.Width))
+		heightEntry.SetText(strconv.Itoa(settings.Height))
+		seedEntry.SetText(strconv.FormatInt(settings.Seed, 10))
+
+		detailSlider.value.Set(settings.Detail)
+		roughnessSlider.value.Set(settings.Roughness)
+
+		lakesSlider.value.Set(float64(settings.Lakes))
+		lakeSizeLowerSlider.value.Set(settings.LakeSizeLower)
+		lakeSizeUpperSlider.value.Set(settings.LakeSizeUpper)
+		lakeEdgeRoughnessSlider.value.Set(settings.LakeEdgeRoughness)
+		lakeShapeSelect.SetSelected(settings.LakeShape)
+
+		riversSlider.value.Set(float64(settings.Rivers))
+		minRiverWidthSlider.value.Set(settings.MinRiverWidth)
+		maxRiverWidthSlider.value.Set(settings.MaxRiverWidth)
+		riverCurvynessSlider.value.Set(settings.RiverCurvyness)
+		riverWidthVariabilitySlider.value.Set(settings.RiverWidthVariability)
+		riverEdgeRoughnessSlider.value.Set(settings.RiverEdgeRoughness)
+
+		minTreeSizeSlider.value.Set(settings.MinTreeSize)
+		maxTreeSizeSlider.value.Set(settings.MaxTreeSize)
+		treeCoverageSlider.value.Set(settings.TreeCoverage)
+		treeClumpinessSlider.value.Set(settings.TreeClumpiness)
+
+		minRoadWidthSlider.value.Set(settings.MinRoadWidth)
+		maxRoadWidthSlider.value.Set(settings.MaxRoadWidth)
+		buildingsPerRoadSlider.value.Set(float64(settings.BuildingsPerRoad))
+		roadExitsSlider.value.Set(float64(settings.RoadExits))
+		roadCurvynessSlider.value.Set(settings.RoadCurvyness)
+		roadDistributionSlider.value.Set(settings.RoadDistribution)
+		minRoadAngleSlider.value.Set(settings.MinRoadAngle)
+
+		minWallWidthSlider.value.Set(settings.MinWallWidth)
+		maxWallWidthSlider.value.Set(settings.MaxWallWidth)
+		numWallsSlider.value.Set(float64(settings.NumWalls))
+		cityCoverageSlider.value.Set(settings.CityCoverage)
+		wallCurvynessSlider.value.Set(settings.WallCurvyness)
+		gateSpacingSlider.value.Set(settings.GateSpacing)
+		showTurretsCheck.SetChecked(settings.ShowTurrets)
+		turretSizeSlider.value.Set(settings.TurretSize)
+		turretShapeSelect.SetSelected(settings.TurretShape)
+		turretSpacingSlider.value.Set(settings.TurretSpacing)
+
+		numBuildingsSlider.value.Set(float64(settings.NumBuildings))
+		minBuildingSizeSlider.value.Set(settings.MinBuildingSize)
+		maxBuildingSizeSlider.value.Set(settings.MaxBuildingSize)
+		buildingDistributionSlider.value.Set(settings.BuildingDistribution)
+		buildingShapeSelect.SetSelected(settings.BuildingShape)
+		updateRatioSliders()
+		minBuildingComplexitySlider.value.Set(float64(settings.MinBuildingComplexity))
+		maxBuildingComplexitySlider.value.Set(float64(settings.MaxBuildingComplexity))
+		buildingComplexityRatioSlider.value.Set(settings.BuildingComplexityRatio)
+
+		for key := range errorStates {
+			errorStates[key] = false
+		}
+		errorLabel.Hide()
+		updateGenerateBtnState()
+	}
+
 	buildingsTab := container.NewTabItem("Buildings", container.NewVBox(
 		numBuildingsSlider,
 		minBuildingSizeSlider,
@@ -1491,6 +1575,8 @@ func main() {
 		exportHeightmapBtn,
 		exportBumpmapBtn,
 		exportMasksBtn,
+		exportSettingsBtn,
+		importSettingsBtn,
 	))
 	// Create the main layout using a horizontal split
 	tabs := container.NewAppTabs(
@@ -1789,6 +1875,124 @@ func saveImage(img image.Image, path string) {
 	}
 }
 
+func decodeSettingsJSON(raw []byte) (*Settings, error) {
+	var imported Settings
+	if err := json.Unmarshal(raw, &imported); err != nil {
+		return nil, err
+	}
+	var rawKeys map[string]json.RawMessage
+	if err := json.Unmarshal(raw, &rawKeys); err != nil {
+		return nil, err
+	}
+	normalizeSettings(&imported, rawKeys)
+	return &imported, nil
+}
+
+func saveSettingsToFile(path string, settings *Settings) error {
+	exportSettings := *settings
+	exportSettings.LastExportPath = ""
+	exportSettings.ImageViewState = 0
+
+	data, err := json.MarshalIndent(&exportSettings, "", "  ")
+	if err != nil {
+		return err
+	}
+	return os.WriteFile(path, data, 0644)
+}
+
+func showSettingsExportDialog(win fyne.Window, settings *Settings) {
+	fileNameEntry := widget.NewEntry()
+	fileNameEntry.SetPlaceHolder("settings")
+
+	pathLabel := widget.NewLabel(settings.LastExportPath)
+
+	browseBtn := widget.NewButton("Browse", func() {
+		dialog.ShowFolderOpen(func(uri fyne.ListableURI, err error) {
+			if err != nil {
+				log.Println("Error opening folder dialog:", err)
+				return
+			}
+			if uri == nil {
+				return
+			}
+			settings.LastExportPath = uri.Path()
+			pathLabel.SetText(settings.LastExportPath)
+		}, win)
+	})
+
+	content := container.NewVBox(
+		widget.NewLabel("Save to:"),
+		container.NewBorder(nil, nil, nil, browseBtn, pathLabel),
+		widget.NewLabel("Filename:"),
+		fileNameEntry,
+	)
+
+	saveDialog := dialog.NewCustom("Export Settings", "Cancel", content, win)
+
+	saveBtn := widget.NewButton("Save", func() {
+		fileName := strings.TrimSpace(fileNameEntry.Text)
+		if fileName == "" {
+			return
+		}
+		if !strings.HasSuffix(strings.ToLower(fileName), ".json") {
+			fileName += ".json"
+		}
+		filePath := filepath.Join(pathLabel.Text, fileName)
+		if err := saveSettingsToFile(filePath, settings); err != nil {
+			dialog.ShowError(err, win)
+			return
+		}
+		settings.LastExportPath = filepath.Dir(filePath)
+		saveDialog.Hide()
+	})
+	saveBtn.Disable()
+
+	fileNameEntry.OnChanged = func(text string) {
+		if strings.TrimSpace(text) == "" {
+			saveBtn.Disable()
+		} else {
+			saveBtn.Enable()
+		}
+	}
+
+	saveDialog.SetButtons([]fyne.CanvasObject{
+		widget.NewButton("Cancel", func() {
+			saveDialog.Hide()
+		}),
+		saveBtn,
+	})
+
+	saveDialog.Show()
+}
+
+func showSettingsImportDialog(win fyne.Window, settings *Settings, apply func(*Settings)) {
+	dialog.ShowFileOpen(func(rc fyne.URIReadCloser, err error) {
+		if err != nil {
+			dialog.ShowError(err, win)
+			return
+		}
+		if rc == nil {
+			return
+		}
+		defer rc.Close()
+
+		raw, err := io.ReadAll(rc)
+		if err != nil {
+			dialog.ShowError(err, win)
+			return
+		}
+		imported, err := decodeSettingsJSON(raw)
+		if err != nil {
+			dialog.ShowError(err, win)
+			return
+		}
+		if uri := rc.URI(); uri != nil {
+			settings.LastExportPath = filepath.Dir(uri.Path())
+		}
+		apply(imported)
+	}, win)
+}
+
 // showSaveDialog displays a dialog for saving an image.
 func showSaveDialog(win fyne.Window, img image.Image, settings *Settings) {
 	// Create UI elements for the save dialog