implement dummy printer

models/printer.go

@@ -0,0 +1,55 @@
+package models
+
+import (
+	"fmt"
+)
+
+type PrintOption string
+
+const (
+	CoverPage PrintOption = "-o FrontCoverPage=Printed -o FrontCoverTray=BypassTray -o InputSlot=Tray1"
+	Colored   PrintOption = "-o SelectColor=Color"
+	Grayscale PrintOption = "-o SelectColor=Grayscale"
+)
+
+type PrintJob struct {
+	Pdf     string
+	Amount  uint
+	Options []PrintOption
+}
+
+func NewPrintJob(shopItem ShopItem, variant ItemVariant, coverPage bool, amount uint) (PrintJob, error) {
+	if shopItem.Pdf == "" {
+		return PrintJob{}, fmt.Errorf("ShopItem has no PDF assigned")
+	}
+
+	if amount > 100 {
+		return PrintJob{}, fmt.Errorf("Amount to big. This is denied for security reasons")
+	}
+
+	var result PrintJob
+	result.Pdf = shopItem.Pdf
+	result.Amount = amount
+
+	if variant.Name == "Colored" {
+		result.Options = append(result.Options, Colored)
+	}
+
+	if coverPage {
+		result.Options = append(result.Options, CoverPage)
+	}
+
+	return result, nil
+}
+
+func (p *PrintJob) Execute() error {
+	baseCommand := "lp -p KONICA_MINOLTA_KONICA_MINOLTA_bizhub_C258/Booklet "
+	baseCommand += fmt.Sprintf("-n %v ", p.Amount)
+
+	for _, option := range p.Options {
+		baseCommand += fmt.Sprintf(" %v ", option)
+	}
+
+	fmt.Println(baseCommand)
+	return nil
+}