xquery version "1.0";

declare namespace request = "http://exist-db.org/xquery/request";
declare namespace util = "http://exist-db.org/xquery/util";
declare namespace echo="http://www.mpiwg-berlin.mpg.de/ns/echo/1.0/";

(: ToDo wenn eine pn gegeben ist (also im Fragment untersucht werden soll) geht es momentan nicht s.u. :)
(: ToDo wenn eine pn gegeben ist, wird momentan der namespace ignoriert wie z.B. xquery=//echo:s&pn=14  :)
let $xQuery := request:get-parameter("xquery", "")
let $xQueryPath := request:get-parameter("xqueryPath", "")
let $mpdlDocUri := request:get-parameter("document", "")
let $pn := number(request:get-parameter("pn", "-1"))
let $startRecord := number(request:get-parameter("startRecord", "1"))
let $maximumRecords := number(request:get-parameter("maximumRecords", "-1"))
let $output := request:get-parameter("output", "")
let $options := request:get-parameter("options", "")

let $documentName := substring-before(substring-after(substring-after(substring-after($mpdlDocUri, "/"), "/"), "/"), ".")
let $docbase := substring-before(substring-after($mpdlDocUri, "/"), "/")
let $fullDocumentUri := concat('/db/mpdl/documents/morph', $mpdlDocUri)
let $document := doc($fullDocumentUri)
let $pageBreaks := 
  if ($docbase = 'archimedes')
  then $document//pb
  else if ($docbase = 'echo')
  then $document//echo:pb
  else $document//pb
let $countPBs := count($pageBreaks)
let $pb1 := subsequence($pageBreaks, $pn, 1)
let $pb2 := subsequence($pageBreaks, $pn + 1, 1)
let $pageFragmentStr := 
  if ($pn != -1 and $countPBs > 0)
  then util:get-fragment-between($pb1, $pb2, true())
  else if ($pn != -1 and $countPBs = 0)
  then ""
  else ""
let $pageFragment :=
  if ($countPBs > 0)
  then util:parse($pageFragmentStr)
  else $document
(: ToDo im Fragment geht es nur mit vorn angehängtem Punkt. Das gibt aber Probleme, wenn es komplizierte XQueries gibt: let $xPathFragment := concat(".", $xpath)  :)
let $resultEval :=
  if ($xQueryPath != "" and $document != "" and $pn > 0)
  then util:eval-inline($pageFragment, $xQueryPath)
  else if ($xQueryPath != "" and $document != "" and $pn = -1)
  then util:eval-inline($document, $xQueryPath)
  else if ($xQueryPath != "" and $mpdlDocUri = "")
  then util:eval($xQueryPath)
  else if ($xQueryPath = "" and $document != "" and $pn > 0)
  then util:eval-inline($pageFragment, $xQuery)
  else if ($xQueryPath = "" and $document != "" and $pn = -1)
  then util:eval-inline($document, $xQuery)
  else if ($xQueryPath = "" and $mpdlDocUri = "")
  then util:eval($xQuery)
  else ()
let $size := count($resultEval)
let $from := $startRecord
let $to := 
  if ($maximumRecords != -1)
  then $startRecord + $maximumRecords - 1
  else $size
let $resultEvalPage := 
  for $entry at $pos in $resultEval
  where $pos >= $from and $pos <= $to
  return 
    <record>
      <id>{$pos}</id>
      <content>{$entry}</content>
    </record>

let $resDocument := 
  if ($document != '' and $pn != -1)
  then <document><id>{$mpdlDocUri}</id><pn>{$pn}</pn></document>
  else if ($document != '' and $pn = -1)
  then <document><id>{$mpdlDocUri}</id></document>
  else ''
let $result := 
      <result>
        <xquery>{$xQuery}</xquery>
        {$resDocument}
        <queryResult>
          <size>{$size}</size>
          <startRecord>{$startRecord}</startRecord>
          <maximumRecords>{$maximumRecords}</maximumRecords>
          <records>
            {$resultEvalPage}
          </records>
        </queryResult>
      </result>  



let $declare := 
  if ($output != "html")
  then util:declare-option("exist:serialize", "method=xml media-type=text/xml omit-xml-declaration=no indent=yes encoding=utf-8")
  else util:declare-option("exist:serialize", "method=html media-type=text/html omit-xml-declaration=no indent=yes encoding=utf-8")

return $result