package main

import (
	"log"
	"time"
)

func WaitUntilNextUpdate() {
	now := time.Now()
	dur := now.Truncate(time.Hour).Add(time.Hour).Sub(now)
	log.Println("sleeping for", dur.Round(time.Second))
	time.Sleep(dur)
}

func contains(rss *Rss, a Item) bool {
	if rss == nil {
		return false
	}
	for _, x := range rss.Channel.Items {
		if x.Title == a.Title {
			return true
		}
	}
	return false
}

func main() {
	var oldRss *Rss
	for {
		rss, err := FetchStackerNewsRssFeed()
		if err != nil {
			log.Println(err)
			WaitUntilNextUpdate()
			continue
		}

		for _, item := range rss.Channel.Items {
			// TODO: We ignore errors during sending items to telegram.
			//   This means these items will be missed since they will be skipped in the next run
			if contains(oldRss, item) {
				continue
			}
			err := SendItemToTelegram(&item)
			if err != nil {
				log.Println(err)
				continue
			}
		}

		oldRss = rss
		WaitUntilNextUpdate()
	}
}