package scheduler

import (
	c "loafle.com/overflow/crawler_go"
	"loafle.com/overflow/cron_go"
	"strconv"
	"sync"
)

const DEFAULT_INTERVAL = 5

type Scheduler struct {
	crawler  *c.CrawlerImpl
	once     sync.Once
	cronChan chan bool
}

func (s *Scheduler) Init() {
	s.once.Do(func() {
		s.cronChan = cron.Start()
		s.crawler = &c.CrawlerImpl{}
	})
}

func (s *Scheduler) Stop() {
	s.cronChan <- false
}

func (s *Scheduler) NewSchedule(id, interval string, fn interface{}) error {

	return s.newSchedule(id, interval, fn)
}

func (s *Scheduler) RemoveSchedule(id string) error {
	return cron.Remove(id)
}

func (s *Scheduler) RemoveAllSchedule() error {
	return cron.RemoveAll()
}

func (s *Scheduler) UpdateSchedule(id string, interval string) {
	i, err := strconv.Atoi(interval)
	if err != nil {
		i = DEFAULT_INTERVAL
	}
	cron.UpdateTask(id, uint64(i))
}

func (s *Scheduler) newSchedule(id string, interval string, fn interface{}) error {
	i, err := strconv.Atoi(interval)
	if err != nil {
		i = DEFAULT_INTERVAL
	}
	return cron.AddTask(id, uint64(i)).Invoke(fn, id)
}