package cron

import (
	"time"

	"github.com/gorhill/cronexpr"
)

type Schedule cronexpr.Expression

func MustParse(in string) *Schedule {
	s, err := Parse(in)
	if err != nil {
		panic(err)
	}
	return s
}

func Parse(in string) (*Schedule, error) {
	expr, err := cronexpr.Parse(in)
	return (*Schedule)(expr), err
}

func (s *Schedule) Next(t time.Time) time.Time {
	expr := (*cronexpr.Expression)(s)
	return expr.Next(t)
}

func (s *Schedule) Unpack(str string) error {
	tmp, err := Parse(str)
	if err == nil {
		*s = *tmp
	}
	return err
}