// <source lang="javascript">

/*
  EditTools support: add a selector, change into true buttons, enable for all text input fields
  The special characters to insert are defined at [[MediaWiki:Edittools]].
*/

// Globals: getElementsByClassName, hookEvent, addEvent (from wiki.js)

if (typeof (EditTools_set_focus) == 'undefined')
  var EditTools_set_focus = true;

if (typeof (EditTools_set_focus_initially) == 'undefined')
  var EditTools_set_focus_initially = EditTools_set_focus;

if (typeof (EditTools_initial_subset) == 'undefined')
  var EditTools_initial_subset = 0;

var EditTools =
{
  createSelector : function ()
  {
    var spec = document.getElementById ('specialchars');
    if (!spec) return;
    var sb = getElementsByClassName (spec, 'p', 'specialbasic');
    if (sb.length<=1) return; // Only care if there is more than one
 
    var sel = document.createElement ('select');
    sel.style.display = 'inline';
    // sel.setAttribute ('onchange', 'EditTools.chooseCharSubset (selectedIndex, true);');
    // Apparently, this doesn't work on IE6. Use an explicit event handling function instead:    
    sel.onchange = EditTools.handleOnchange;

    var initial = EditTools_initial_subset;
    if (isNaN (initial) || initial < 0 || initial >= sb.length) initial = 0;

    for (var i=0; i < sb.length; i++) {
      var o = document.createElement ('option');
      // Ugh. We have encoded Unicode characters in the names...
      var id = sb[i].id.replace (/.([0-9A-F][0-9A-F])/g, '%$1').replace(/_/g, ' ');
      if (i == initial) o.selected = 'selected';      
      o.appendChild (document.createTextNode (decodeURIComponent (id)));
      sel.appendChild (o);
    }
    
    spec.insertBefore (sel, spec.firstChild);

    EditTools.chooseCharSubset
     (initial
      , (wgAction != 'submit')
        && EditTools_set_focus_initially
        && (wgCanonicalNamespace != 'Special' || wgCanonicalSpecialPageName != 'Upload')
     );
  },
     
  handleOnchange : function (evt)
  {
    var e    = evt || window.event;      // W3C, IE
    var node = e.target || e.srcElement; // W3C, IE
    
    EditTools.chooseCharSubset (node.selectedIndex, true);
    return true;
  },

  chooseCharSubset : function (selected, set_focus)
  {
    var sb = getElementsByClassName (document.getElementById ('specialchars'), 'p', 'specialbasic');
    EditTools.makeButtons (sb[selected]);
    for (var i = 0; i < sb.length ; i++) {
      sb[i].style.display = i == selected ? 'inline' : 'none';
    }
    if (set_focus && EditTools_set_focus) {
      var txtarea = EditTools.getTextArea ();
      if (txtarea) txtarea.focus ();
    }
  },

  fixateWidth : function ()
  {
    var edit_bar = document.getElementById ('specialchars');
    if (!edit_bar) return;
    // Try to fixate the width of that bar, otherwise IE6 may make it wider, which will lead to
    // a table re-layout on the upload form resulting in the right column extending beyond the
    // right edge of the window.
    edit_bar.setAttribute ('width', "" + (edit_bar.clientWidth || edit_bar.offsetWidth));
    edit_bar.style.maxWidth = "" + (edit_bar.clientWidth || edit_bar.offsetWidth) + "px";
    // If we're inside a table, fixate the containing table cell, too.
    var parent = edit_bar.parentNode;
    while (parent && parent != document.body && parent.nodeName.toLowerCase () != 'td')
      parent = parent.parentNode;
    if (parent && parent != document.body) {
      parent.setAttribute ('width', "" + (parent.clientWidth || parent.offsetWidth));
      parent.style.maxWidth = "" + (parent.clientWidth || parent.offsetWidth) + "px";
    }
  },

  makeButtons : function (section)
  {
    var edit_bar = section || document.getElementById ('specialchars');
    if (!edit_bar) return;
    var links = edit_bar.getElementsByTagName ('a');
    // 'links' is a *live* collection!
    var b = null;
    while (links.length) {
      b = document.createElement ('input');
      b.type = 'button';
      b.style.fontSize = '0.9em';
      b.style.paddingLeft = '1px';
      b.style.paddingRight = '1px';
      b.style.marginLeft = '1px';
      b.onclick = links[0].onclick;
      b.value = links[0].firstChild.data;
      var parent = links[0].parentNode;
      parent.replaceChild (b, links[0]); // This removes links[0] from links!
      b.blur (); // IE6 insists on marking some buttons as having the focus...
      var margin_added = false;
      // Remove text nodes (nodeType == Node.TEXT_NODE, but IE6 doesn't know that...)
      // Insert some spacing where desired.
      while (b.nextSibling && b.nextSibling.nodeType == 3) {
        if (!margin_added && b.nextSibling.data.search(/\S/) >= 0) {
          b.style.marginRight = '4px';
          margin_added = true;
        }
        parent.removeChild (b.nextSibling);
      }
    }
  },

  enableForAllFields : function ()
  {
    if (typeof (insertTags) != 'function') return;
    // insertTags from the site-wide /skins-1.5/common/edit.js just inserts in the first
    // textarea in the document. Evidently, that's not good if we have multiple textareas.
    // My first idea was to simply add a hidden textarea as the first one, and redefine
    // insertTags such that it copied first the last active textareas contents over to that hidden
    // field, set the cursor or selection there, let the standard insertTags do its thing, and
    // then copy the hidden field's text, cursor position and selection back to the currently
    // active field. Unfortunately, that is just as complex as simply copying the whole code
    // from wikibits to here and let it work on the right text field in the first place.
    var texts = document.getElementsByTagName ('textarea');    
    for (var i = 0; i < texts.length; i++) {
      addEvent (texts[i], 'focus', EditTools.registerTextField);
    }
    // While we're at it, also enable it for input fields
    texts = document.getElementsByTagName ('input');
    for (var i = 0; i < texts.length; i++) {
      if (texts[i].type == 'text') addEvent (texts[i], 'focus', EditTools.registerTextField);
    }
    insertTags = EditTools.insertTags; // Redefine the global insertTags
  },

  last_active_textfield : null,

  registerTextField : function (evt)
  {
    var e = evt || window.event;
    var node = e.target || e.srcElement;
    if (!node) return;
    EditTools.last_active_textfield = node.id;
    return true;
  },

  getTextArea : function ()
  {
    var txtarea = null;
    if (EditTools.last_active_textfield && EditTools.last_active_textfield != "")
      txtarea = document.getElementById (EditTools.last_active_textfield);
    if (!txtarea) {
      // Fallback option: old behaviour
      if (document.editform) {
        txtarea = document.editform.wpTextbox1;
      } else {
        // Some alternate form? Take the first one we can find
        txtarea = document.getElementsByTagName ('textarea');
        if (txtarea.length > 0) txtarea = txtarea[0]; else txtarea = null;
      }
    }
    return txtarea;
  },
   
  insertTags : function (tagOpen, tagClose, sampleText)
  {
    var txtarea = EditTools.getTextArea ();
    if (!txtarea) return;

    /* Usability initiative compatibility */
    if ( typeof $j != 'undefined' && typeof $j.fn.textSelection != 'undefined' ) {
        $j( txtarea ).textSelection(
            'encapsulateSelection', { 'pre': tagOpen, 'peri': sampleText, 'post': tagClose }
        );
        return;
    }

    var selText, isSample = false;

    function checkSelectedText () {
      if (!selText) {
        selText = sampleText; isSample = true;
      } else if (selText.charAt (selText.length - 1) == ' ') { // Exclude ending space char
        selText = selText.substring (0, selText.length - 1);
        tagClose += ' '
      } 
    }

    if (document.selection && document.selection.createRange) { // IE/Opera
      // Save window scroll position
      var winScroll = 0;
      if (document.documentElement && document.documentElement.scrollTop)
        winScroll = document.documentElement.scrollTop;
      else if (document.body)
        winScroll = document.body.scrollTop;
      // Get current selection  
      txtarea.focus();
      var range = document.selection.createRange();
      selText = range.text;
      // Insert tags
      checkSelectedText ();
      range.text = tagOpen + selText + tagClose;
      // Mark sample text as selected
      if (isSample && range.moveStart) {
        if (window.opera) tagClose = tagClose.replace (/\n/g, "");
        range.moveStart( 'character', - tagClose.length - selText.length); 
        range.moveEnd ('character', - tagClose.length); 
      }
      range.select ();   
      // Restore window scroll position
      if (document.documentElement && document.documentElement.scrollTop)
        document.documentElement.scrollTop = winScroll;
      else if (document.body)
        document.body.scrollTop = winScroll;
    } else if (txtarea.selectionStart || txtarea.selectionStart == '0') { // Mozilla
      // Save textarea scroll position
      var textScroll = txtarea.scrollTop;
      // Get current selection
      txtarea.focus();
      var startPos = txtarea.selectionStart;
      var endPos   = txtarea.selectionEnd;
      selText = txtarea.value.substring (startPos, endPos);
      // Insert tags
      checkSelectedText ();
      txtarea.value = txtarea.value.substring (0, startPos)
                    + tagOpen + selText + tagClose
                    + txtarea.value.substring (endPos);
      // Set new selection
      if (isSample) {
        txtarea.selectionStart = startPos + tagOpen.length;
        txtarea.selectionEnd = startPos + tagOpen.length + selText.length;
      } else {
        txtarea.selectionStart = startPos + tagOpen.length + selText.length + tagClose.length;
        txtarea.selectionEnd = txtarea.selectionStart;
      }
      // Restore textarea scroll position
      txtarea.scrollTop = textScroll;
    }
  }, // end insertTags

  setup : function ()
  {
    EditTools.fixateWidth ();
    EditTools.createSelector ();
    EditTools.enableForAllFields ();
  }

} // end EditTools

// Do not use addOnloadHook; it runs *before* the onload event fires. At that time, onclick or
// onfocus handlers may not yet be set up properly.
hookEvent ('load', EditTools.setup);

// </source>