{-# LANGUAGE Arrows, NoMonomorphismRestriction #-}
import ShadowLibrary.Core

import Text.XML.HXT.Core
import Text.XML.HXT.XPath
import Text.XML.HXT.Curl
import Data.List
import Data.List.Utils (replace)

import Text.Regex.Posix
import Text.Printf

extractRecords = extractLinksWithText "//h3[@class='media-heading']/a"
                 >>> first (arr (++"/issue/archive"))
                 >>> first (extractLinksWithText "//*[@class='media-heading']/a"
                            >>> first (extractLinksWithText "//*[@class='media-heading']/a" 
                                        >>>  first (extractLinks "//div[@class='download']/a")))


toShadowItem :: (((String, String), String), String) -> ShadowItem
toShadowItem (((url, articleTitle), yearlyTitle), journalTitle) =
  (defaultShadowItem url title) {
    originalDate = Just date,
    itype = "periodical",
    format = Just "pdf",
    finalUrl = url
    }
  where title = replace "\n" "" (replace "\t" "" (journalTitle ++ " " ++  yearlyTitle ++ " " ++ articleTitle))
        date = getDate yearlyTitle

getDate yearlyTitle =
  case yearlyTitle =~~ "(19[0-9][0-9]|20[0-9][0-9])" :: Maybe [[String]] of
    Just [[_, year]] -> year
    otherwise -> error $ "unexpected text: " ++ yearlyTitle


main = do
    let start = "https://pressto.amu.edu.pl"
    let shadowLibrary = ShadowLibrary {logoUrl=Nothing,
                                       lname="Otwarte Czasopisma Naukowe UAM",
                                       abbrev="OtwCzasNaukUAM",
                                       lLevel=0,
                                       webpage=start}
    extractItemsStartingFromUrl shadowLibrary start (extractRecords >>> arr toShadowItem)