chore(ENT-923): add priority comparison methods

Author: juicetin

pkg/models/priority.go

@@ -5,3 +5,30 @@ const (
 	PriorityImportant     string = "IMPORTANT"
 	PriorityInformational string = "INFORMATIONAL"
 )
+
+var priorityToInt = map[string]int{
+	PriorityUrgent:        0,
+	PriorityImportant:     1,
+	PriorityInformational: 2,
+}
+
+func ComparePriority(priority1, priority2 string) int {
+	val1, ok1 := priorityToInt[priority1]
+	val2, ok2 := priorityToInt[priority2]
+
+	if !ok1 && !ok2 {
+		return 0
+	} else if !ok1 {
+		return -1
+	} else if !ok2 {
+		return 1
+	}
+
+	if val1 < val2 {
+		return -1
+	} else if val1 > val2 {
+		return 1
+	} else {
+		return 0
+	}
+}