/* Semi-automatic image watcher, version [0.0.3a]

Originally from: http://en.wikipedia.org/wiki/User:Splarka/watchimages.js



Operation:

* Checks which images are being used on a page

* Sorts out those from commons, builds a list of those local or missing

* Passes this list to Special:Watchlist/raw (but does not save, being a test script).

* When saved, returns to the original page.



Notes: 

* The logic of which images to watch is easily changed (see below)

* This avoids ajax editing (which is a pain). Possibly the API actions will be enabled later.



To do after more testing:

* Abort if no matching images are found.

* Check page more specifically for a content type (page has ID? etc).

* Auto-submit if so desired.

*/



if(mw.config.get('wgNamespaceNumber') != -1) addOnloadHook(watchAllImagesButton)

function watchAllImagesButton() {

  mw.util.addPortletLink('p-tb','javascript:watchAllImages()','Watch images','t-wai','Add all images on this page to your watchlist.');

}



function watchAllImages() {

  var wai = document.getElementById('t-wai');

  if(wai) {

    wai.getElementsByTagName('a')[0].style.display = 'none';

    var prog = document.createElement('img');

    prog.setAttribute('id','wai-prog');

    prog.setAttribute('src',stylepath + '/common/images/spinner.gif');

    wai.appendChild(document.createTextNode('Working...'));

    wai.appendChild(prog);

  }

  var url = mw.config.get('wgServer') + mw.config.get('wgScriptPath') +'/api.php?action=query&format=json&callback=watchAllImagesCB&generator=images&prop=imageinfo&iiprop=&iilimit=1&titles=' + encodeURIComponent(mw.config.get('wgPageName'))

  var scriptElem = document.createElement('script');

  scriptElem.setAttribute('src',url);

  scriptElem.setAttribute('type','text/javascript');

  document.getElementsByTagName('head')[0].appendChild(scriptElem);

}



function watchAllImagesCB(obj) {

  document.getElementById('wai-prog').style.display = 'none';

  var towatch = '';

  if(!obj'query' || !obj'query']['pages']) return

  var images = obj'query']['pages'];

  for(var i in images) {

    // Logic variables to determine which images to watch

    // islocal = image is local, rather than shared (from commons).

    // haspage = has a description page, all local and some shared images have this.

    // hasmedia = the image exists, either locally or shared.



    var islocal = (imagesi]['imagerepository' == 'local')

    var haspage = i > 0

    var hasmedia = (imagesi]['imagerepository' != '')



    //(!hasmedia || islocal) => all local images, as well as all missing (deleted or soon to be uploaded) images

    if(!hasmedia || islocal) {

      towatch += imagesi]['title' += '\n';

    }

  }

  var url = mw.config.get('wgServer') + mw.config.get('wgArticlePath').replace(/\$1/,'Special:Watchlist/raw') + '?fromtitle=' + encodeURIComponent(mw.config.get('wgPageName')) + '&towatch=' + encodeURIComponent(towatch);

  document.location.href = url;

}



if(queryString('towatch') && mw.config.get('wgCanonicalSpecialPageName') == 'Watchlist') addOnloadHook(addToWatchlist)

function addToWatchlist() {

  var txt = document.getElementById('titles');

  var towatch = decodeURIComponent(queryString('towatch'));

  if(!txt) return

  if(queryString('fromtitle')) {

    var forms = document.forms;

    for(var i=0;i<forms.length;i++) {

      if(formsi].action.indexOf('Watchlist') != -1) {

        formsi].action += '&pleasereturnto=' + queryString('fromtitle');

      }

    }

  }

  txt.value += towatch;

  alert('Note: the following images will be added to your watchlist upon save:\n' + towatch);

}



if(queryString('pleasereturnto') && mw.config.get('wgCanonicalSpecialPageName') == 'Watchlist') addOnloadHook(addToWatchlistDone)

function addToWatchlistDone() {

  var url = mw.config.get('wgServer') + mw.config.get('wgArticlePath').replace(/\$1/,decodeURIComponent(queryString('pleasereturnto')));

  document.location.href = url;

}



function queryString(p) {

  var re = RegExp('[&?]' + p + '=([^&]*)');

  var matches;

  if (matches = re.exec(document.location)) {

    try { 

      return decodeURI(matches1]);

    } catch (e) {

    }

  }

  return null;

}