import std/[algorithm, json, xmltree, times, options, sequtils]
import pkg/[mummy, rssatom, puppy, pretty]

const
  atomTimeFormat {.strdefine.} = "yyyy-MM-dd'T'HH:mm:ss'Z'"
  rssv2TimeFormat {.strdefine.} = "ddd',' dd MMM yyyy HH:mm:ss ZZZ"

type RssFeed = object # name:string
  url: string
  kind: FeedType

proc parseAtomTime(s: string): DateTime =
  parse(s, atomTimeFormat)

proc parseRSSv2Time(s: string): DateTime =
  parse(s, rssv2TimeFormat)

proc getrssv2Time(r:RssItem):DateTime=
  result = dateTime(0, Month.low, MonthdayRange.low)
  if r.pubDate.isSome():
    result = parseRssv2Time(r.pubDate.get())


proc getTime(r: RssItem): DateTime =
  result = dateTime(0, Month.low, MonthdayRange.low)
  if r.updated.isSome():
    result = parseAtomTime(r.updated.get())
  elif r.pubDate.isSome():
    result = parseAtomTime(r.pubDate.get())

proc cmpRssItem(x, y: RssItem): int =
  cmp(x.getTime(), y.getTime())

proc mixRssFeeds(feeds: seq[RssFeed]): RSS =
  result = RSS()
  result.id = "https://example.com/".some()
  result.title = "This is a test".some()
  result.link = "link.com".some()
  result.author.name = "Samuel R.".some()
  result.description = "this is a test for this and that".some()
  var entries: seq[RSS]
  for feed in feeds:
    case feed.kind
    of Atom:
      entries.add parseAtom(fetch(feed.url))
    of RSSv2:
      entries.add parseRss(fetch(feed.url))

      entries[^1].items = entries[^1].items.mapIt(
        block:
          var item = it
          item.pubdate = some(getRssv2Time(item).format(atomTimeFormat))
          item
      )

  for feed in entries:
    result.items.add feed.items

  result.items.sort(cmp = cmpRssItem, order = Descending)

proc assembleAtom(r: RSS): XmlNode =
  result = buildAtom(r)
  result.attrs = {
    "xmlns": "http://www.w3.org/2005/Atom",
    "xmlns:thr": "http://purl.org/syndication/thread/1.0",
    "xml:lang": "en-EN"
  }.toXmlAttributes()

  discard

echo assembleAtom(
  mixRssFeeds(
    @[
      RssFeed(kind: Atom, url: "https://github.com/nim-lang/Nim/releases.atom"),
      RssFeed(kind: Atom, url: "https://github.com/fatedier/frp/releases.atom"),
      RssFeed(kind: RSSv2, url: "https://fedoramagazine.org/rss"),
      RssFeed(kind: RSSv2, url: "http://communityblog.fedoraproject.org/?feed=rss2"),
    ]
  )
)