Added Plates and Items Models and connected them with the Frontend

internal/svgtemplate/meta.go

@@ -0,0 +1,38 @@
+package svgtemplate
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+	"time"
+
+	"github.com/google/uuid"
+	"printer.backend/internal/model"
+)
+
+// WriteMeta writes item metadata next to the SVG in OutputDir.
+func WriteMeta(svgBasename string, spec model.ItemSpec, name string) (model.Item, error) {
+	if err := os.MkdirAll(OutputDir, 0o755); err != nil {
+		return model.Item{}, err
+	}
+
+	base := filepath.Base(filepath.Clean(svgBasename))
+	item := model.Item{
+		ID:          uuid.NewString(),
+		Name:        name,
+		Spec:        spec,
+		SVGTemplate: base,
+		CreatedAt:   time.Now().UTC(),
+	}
+
+	metaPath := filepath.Join(OutputDir, model.MetaFilename(base))
+	data, err := json.MarshalIndent(item, "", "  ")
+	if err != nil {
+		return model.Item{}, err
+	}
+	if err := os.WriteFile(metaPath, data, 0o644); err != nil {
+		return model.Item{}, fmt.Errorf("write meta: %w", err)
+	}
+	return item, nil
+}

internal/svgtemplate/template.go

@@ -5,6 +5,8 @@ import (
 	"os"
 	"path/filepath"
 	"text/template"
+
+	"printer.backend/internal/paths"
 )
 
 const svgTemplate = `<?xml version="1.0" encoding="UTF-8" standalone="no"?>
@@ -55,7 +57,7 @@ func Write(w io.Writer, data Data) error {
 }
 
 // OutputDir is the directory where generated SVG files are written.
-const OutputDir = "svg_template"
+const OutputDir = paths.SVGTemplateDir
 
 // WriteFile renders the SVG template into OutputDir.
 func WriteFile(path string, data Data) error {