package templates

import (
	"fmt"
	"time"
)

func elapsed(start, end *time.Time) time.Duration {
	if start == nil {
		return -1
	}
	e := time.Now()
	if end != nil {
		e = *end
	}
	d := e.Sub(*start)
	if d < 0 {
		return 0
	}
	return d
}

func fmtElapsed(d time.Duration, long bool) string {
	switch {
	case d < time.Second:
		return fmt.Sprintf("%dms", int(d/time.Millisecond))
	case d < 10*time.Second:
		return fmt.Sprintf("%.1fs", d.Seconds())
	case d < time.Minute:
		return fmt.Sprintf("%ds", int(d/time.Second))
	case d < time.Hour:
		if long {
			return fmt.Sprintf("%dm %ds", int(d/time.Minute), int((d%time.Minute)/time.Second))
		}
		return fmt.Sprintf("%dm", int(d/time.Minute))
	default:
		if long {
			return fmt.Sprintf("%dh %dm", int(d/time.Hour), int((d%time.Hour)/time.Minute))
		}
		return fmt.Sprintf("%dh", int(d/time.Hour))
	}
}