package service

import (
	"math/rand"
	"time"
)

type Duration struct {
	time.Duration
}

func DurationRef(v time.Duration) *Duration {
	return &Duration{v}
}

func (s Duration) MarshalText() ([]byte, error) {
	return []byte(s.Duration.String()), nil
}

func (s *Duration) Max(args ...*Duration) Duration {
	m := s

	for _, o := range args {
		if m.Duration < o.Duration {
			v := o
			m = v
		}
	}

	return *m
}

func (s *Duration) Min(args ...*Duration) Duration {
	m := s

	for _, o := range args {
		if m.Duration > o.Duration {
			v := o
			m = v
		}
	}

	return *m
}

func (s *Duration) UnmarshalText(text []byte) error {
	v, err := time.ParseDuration(string(text))
	if err != nil {
		return err
	}
	*s = Duration{v}

	return nil
}

func RandomDuration(from Duration, until Duration) Duration {
	period := until.Duration - from.Duration
	return Duration{from.Duration + time.Duration(rand.Intn(int(period)))}
}