Initial commit

server/internal/domain/queue.go

@@ -0,0 +1,29 @@
+package domain
+
+import (
+	"fmt"
+
+	"calllinesystem/server/internal/model"
+)
+
+func DisplayNumber(_ string, number int) (string, error) {
+	if number <= 0 || number > 99999 {
+		return "", fmt.Errorf("invalid ticket number")
+	}
+	return fmt.Sprintf("%05d", number), nil
+}
+
+func CanTransitionTicket(from, to string) bool {
+	switch to {
+	case model.TicketArrived:
+		return from == model.TicketCalled || from == model.TicketArrived
+	case model.TicketCompleted:
+		return from == model.TicketCalled || from == model.TicketArrived || from == model.TicketCompleted
+	case model.TicketMissed:
+		return from == model.TicketCalled || from == model.TicketMissed
+	case model.TicketCanceled:
+		return from == model.TicketWaiting || from == model.TicketCanceled
+	default:
+		return false
+	}
+}