feat(api): implement new api handler

internal/util/duration.go

@@ -0,0 +1,47 @@
+package util
+
+import (
+	"math"
+	"strconv"
+	"strings"
+	"time"
+)
+
+func FormatDuration(d time.Duration) string {
+	sb := strings.Builder{}
+
+	hours := int64(d.Hours())
+	minutes := int64(math.Mod(d.Minutes(), 60))
+	seconds := int64(math.Mod(d.Seconds(), 60))
+
+	if hours == 1 {
+		sb.WriteString("1 hour")
+	} else if hours != 0 {
+		sb.WriteString(strconv.FormatInt(hours, 10))
+		sb.WriteString(" hours")
+	}
+
+	if hours != 0 && (seconds != 0 || minutes != 0) {
+		sb.WriteString(", ")
+	}
+
+	if minutes == 1 {
+		sb.WriteString("1 minute")
+	} else if minutes != 0 {
+		sb.WriteString(strconv.FormatInt(minutes, 10))
+		sb.WriteString(" minutes")
+	}
+
+	if minutes != 0 && (seconds != 0) {
+		sb.WriteString(", ")
+	}
+
+	if seconds == 1 {
+		sb.WriteString("1 second")
+	} else if seconds != 0 || (hours == 0 && minutes == 0) {
+		sb.WriteString(strconv.FormatInt(seconds, 10))
+		sb.WriteString(" seconds")
+	}
+
+	return sb.String()
+}