package nomad

import (
	"sort"

	"github.com/mmcdole/gofeed"
)

type Item struct {
	URL     Source
	Title   string
	PubDate int64
}

type itemList []Item

func (l itemList) Len() int {
	return len(l)
}

func (l itemList) Less(i, j int) bool {
	return l[i].PubDate < l[j].PubDate
}

func (l itemList) Swap(i, j int) {
	l[i], l[j] = l[j], l[i]
}

func FetchRSS(feedSource Source) (items []Item, err error) {
	rd, err := feedSource.Fetch()
	if err != nil {
		return nil, err
	}

	feedParser := gofeed.NewParser()
	feed, err := feedParser.ParseString(rd)
	if err != nil {
		return nil, err
	}

	for _, item := range feed.Items {
		items = append(items, Item{
			URL:     NewSoupSource(item.Link),
			Title:   item.Title,
			PubDate: item.PublishedParsed.Unix(),
		})
	}

	sort.Sort(itemList(items))
	return items, nil
}