init push

internal/shared/pkg/missioncode/mission_code.go

@@ -0,0 +1,32 @@
+package missioncode
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+	"time"
+)
+
+const (
+	prefixStatic = "M-"
+	suffixWidth  = 3
+)
+
+// BuildPrefix returns the daily mission code prefix, e.g. M-042426-
+func BuildPrefix(t time.Time) string {
+	return prefixStatic + t.Format("010206") + "-"
+}
+
+// NextFromLatest returns next code in sequence using latest code for a day.
+// If latest is empty/invalid, sequence starts from 001.
+func NextFromLatest(prefix string, latest string) string {
+	next := 1
+	latest = strings.TrimSpace(latest)
+	if strings.HasPrefix(latest, prefix) {
+		suffix := strings.TrimPrefix(latest, prefix)
+		if n, err := strconv.Atoi(suffix); err == nil && n > 0 {
+			next = n + 1
+		}
+	}
+	return fmt.Sprintf("%s%0*d", prefix, suffixWidth, next)
+}