/**
 * Functions for text editing (toolbar stuff)
 *
 * @todo I'm no JS guru please help if you know how to improve
 * @author Andreas Gohr <andi@splitbrain.org>
 */

/**
 * Creates a toolbar button through the DOM
 *
 * Style the buttons through the toolbutton class
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function createToolButton(icon,label,key,id){
    var btn = document.createElement('button');
    var ico = document.createElement('img');

    // preapare the basic button stuff
    btn.className = 'toolbutton';
    btn.title = label;
    if(key){
        btn.title += ' [ALT+'+key.toUpperCase()+']';
        btn.accessKey = key;
    }

    // set IDs if given
    if(id){
        btn.id = id;
        ico.id = id+'_ico';
    }

    // create the icon and add it to the button
    ico.src = DOKU_BASE+'lib/images/toolbar/'+icon;
    btn.appendChild(ico);

    return btn;
}

/**
 * Creates a picker window for inserting text
 *
 * The given list can be an associative array with text,icon pairs
 * or a simple list of text. Style the picker window through the picker
 * class or the picker buttons with the pickerbutton class. Picker
 * windows are appended to the body and created invisible.
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function createPicker(id,list,icobase,edid){
    var cnt = list.length;
      
    var picker = document.createElement('div');
    picker.className = 'picker';
    picker.id = id;
    picker.style.position = 'absolute';
    picker.style.display  = 'none';
      
    for(var key in list){
        var btn = document.createElement('button');

        btn.className = 'pickerbutton'

        // associative array?
        if(isNaN(key)){
            var ico = document.createElement('img');
            ico.src       = DOKU_BASE+'lib/images/'+icobase+'/'+list[key];
            btn.title     = key;
            btn.appendChild(ico);
            eval("btn.onclick = function(){pickerInsert('"+id+"','"+
                                  jsEscape(key)+"','"+
                                  jsEscape(edid)
                                +"');return false;}");
        }else{
            var txt = document.createTextNode(list[key]);
            btn.title     = list[key];
            btn.appendChild(txt);
            eval("btn.onclick = function(){pickerInsert('"+id+"','"+
                                  jsEscape(list[key])+"','"+
                                  jsEscape(edid)
                                +"');return false;}");
        }

        picker.appendChild(btn);
    }
    var body = document.getElementsByTagName('body')[0];
    body.appendChild(picker);
}

/**
 * Called by picker buttons to insert Text and close the picker again
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function pickerInsert(pickerid,text,edid){
    // insert
    insertAtCarret(edid,text);
    // close picker
    pobj = document.getElementById(pickerid);
    pobj.style.display = 'none';
}

/**
 * Show a previosly created picker window
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function showPicker(pickerid,btn){
    var picker = document.getElementById(pickerid);
    var x = findPosX(btn);
    var y = findPosY(btn);
    if(picker.style.display == 'none'){
        picker.style.display = 'block';
        picker.style.left = (x+3)+'px';
        picker.style.top = (y+btn.offsetHeight+3)+'px';
    }else{
        picker.style.display = 'none';
    }
}

/**
 * Create a toolbar
 *
 * @param  string tbid ID of the element where to insert the toolbar
 * @param  string edid ID of the editor textarea
 * @param  array  tb   Associative array defining the buttons
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function initToolbar(tbid,edid,tb){
		if(!document.getElementById) return;
    var toolbar = document.getElementById(tbid);
    var cnt = tb.length;
    for(i=0; i<cnt; i++){
        // create new button and add to the toolbar
        btn = createToolButton(tb[i]['icon'],
                               tb[i]['title'],
                               tb[i]['key']);
        toolbar.appendChild(btn);

        // add button action dependend on type
        switch(tb[i]['type']){
            case 'format':
                var sample = tb[i]['title'];
                if(tb[i]['sample']) sample = tb[i]['sample'];
      
                eval("btn.onclick = function(){insertTags('"+
                                        jsEscape(edid)+"','"+
                                        jsEscape(tb[i]['open'])+"','"+
                                        jsEscape(tb[i]['close'])+"','"+
                                        jsEscape(sample)+
                                    "');return false;}");
                break;
            case 'insert':
                eval("btn.onclick = function(){insertAtCarret('"+
                                        jsEscape(edid)+"','"+
                                        jsEscape(tb[i]['insert'])+
                                    "');return false;}");
                break;
            case 'picker':
                createPicker('picker'+i,
                             tb[i]['list'],
                             tb[i]['icobase'],
                             edid);
                eval("btn.onclick = function(){showPicker('picker"+i+
                                    "',this);return false;}");
                break;
            case 'popup':
                eval("btn.onclick = function(){window.open('"+
                                        jsEscape(tb[i]['url'])+"','"+
                                        jsEscape(tb[i]['name'])+"','"+
                                        jsEscape(tb[i]['options'])+
                                    "');return false;}");
                break;
        } // end switch
    } // end for
}

/**
 * Format selection
 *
 * Apply tagOpen/tagClose to selection in textarea, use sampleText instead
 * of selection if there is none. Copied and adapted from phpBB
 *
 * @author phpBB development team
 * @author MediaWiki development team
 * @author Andreas Gohr <andi@splitbrain.org>
 * @author Jim Raynor <jim_raynor@web.de>
 */
function insertTags(edid,tagOpen, tagClose, sampleText) {
  var txtarea = document.getElementById(edid);
  // IE
  if(document.selection  && !is_gecko) {
    var theSelection = document.selection.createRange().text;
    var replaced = true;
    if(!theSelection){
      replaced = false;
      theSelection=sampleText;
    }
    txtarea.focus();
 
    // This has change
    text = theSelection;
    if(theSelection.charAt(theSelection.length - 1) == " "){// exclude ending space char, if any
      theSelection = theSelection.substring(0, theSelection.length - 1);
      r = document.selection.createRange();
      r.text = tagOpen + theSelection + tagClose + " ";
    } else {
      r = document.selection.createRange();
      r.text = tagOpen + theSelection + tagClose;
    }
    if(!replaced){
      r.moveStart('character',-text.length-tagClose.length);
      r.moveEnd('character',-tagClose.length);
    }
    r.select();
  // Mozilla
  } else if(txtarea.selectionStart || txtarea.selectionStart == '0') {
    var replaced = false;
    var startPos = txtarea.selectionStart;
    var endPos   = txtarea.selectionEnd;
    if(endPos - startPos) replaced = true;
    var scrollTop=txtarea.scrollTop;
    var myText = (txtarea.value).substring(startPos, endPos);
    if(!myText) { myText=sampleText;}
    if(myText.charAt(myText.length - 1) == " "){ // exclude ending space char, if any
      subst = tagOpen + myText.substring(0, (myText.length - 1)) + tagClose + " ";
    } else {
      subst = tagOpen + myText + tagClose;
    }
    txtarea.value = txtarea.value.substring(0, startPos) + subst +
                    txtarea.value.substring(endPos, txtarea.value.length);
    txtarea.focus();
 
    //set new selection
    if(replaced){
      var cPos=startPos+(tagOpen.length+myText.length+tagClose.length);
      txtarea.selectionStart=cPos;
      txtarea.selectionEnd=cPos;
    }else{
      txtarea.selectionStart=startPos+tagOpen.length;   
      txtarea.selectionEnd=startPos+tagOpen.length+myText.length;
    }
    txtarea.scrollTop=scrollTop;
  // All others
  } else {
    var copy_alertText=alertText;
    var re1=new RegExp("\\$1","g");
    var re2=new RegExp("\\$2","g");
    copy_alertText=copy_alertText.replace(re1,sampleText);
    copy_alertText=copy_alertText.replace(re2,tagOpen+sampleText+tagClose);
    var text;
    if (sampleText) {
      text=prompt(copy_alertText);
    } else {
      text="";
    }
    if(!text) { text=sampleText;}
    text=tagOpen+text+tagClose;
    //append to the end
    txtarea.value += "\n"+text;

    // in Safari this causes scrolling
    if(!is_safari) {
      txtarea.focus();
    }

  }
  // reposition cursor if possible
  if (txtarea.createTextRange) txtarea.caretPos = document.selection.createRange().duplicate();
}

/*
 * Insert the given value at the current cursor position
 *
 * @see http://www.alexking.org/index.php?content=software/javascript/content.php
 */
function insertAtCarret(edid,value){
  var field = document.getElementById(edid);

  //IE support
  if (document.selection) {
    field.focus();
    if(opener == null){
      sel = document.selection.createRange();
    }else{
      sel = opener.document.selection.createRange();
    }
    sel.text = value;
  //MOZILLA/NETSCAPE support
  }else if (field.selectionStart || field.selectionStart == '0') {
    var startPos  = field.selectionStart;
    var endPos    = field.selectionEnd;
    var scrollTop = field.scrollTop;
    field.value = field.value.substring(0, startPos)
                  + value
                  + field.value.substring(endPos, field.value.length);

    field.focus();
    var cPos=startPos+(value.length);
    field.selectionStart=cPos;
    field.selectionEnd=cPos;
    field.scrollTop=scrollTop;
  } else {
    field.value += "\n"+value;
  }
  // reposition cursor if possible
  if (field.createTextRange) field.caretPos = document.selection.createRange().duplicate();
}


/**
 * global var used for not saved yet warning
 */
var textChanged = false;

/**
 * Check for changes before leaving the page
 */
function changeCheck(msg){
  if(textChanged){
    return confirm(msg);
  }else{
    return true;
  }
}

/**
 * Add changeCheck to all Links and Forms (except those with a
 * JSnocheck class), add handlers to monitor changes
 *
 * Sets focus to the editbox as well
 */
function initChangeCheck(msg){
		if(!document.getElementById) return;
		// add change check for links
		var links = document.getElementsByTagName('a');
		for(var i=0; i < links.length; i++){
				if(links[i].className.indexOf('JSnocheck') == -1){
						links[i].onclick = function(){return changeCheck(msg);};
						links[i].onkeypress = function(){return changeCheck(msg);};
				}
		}
		// add change check for forms
    var forms = document.forms;
    for(i=0; i < forms.length; i++){
				if(forms[i].className.indexOf('JSnocheck') == -1){
		        forms[i].onsubmit = function(){return changeCheck(msg);};
				}
    }

		// reset change memory var on submit
		var btn_save        = document.getElementById('edbtn_save');
		btn_save.onclick    = function(){ textChanged = false; };
		btn_save.onkeypress = function(){ textChanged = false; };
		var btn_prev        = document.getElementById('edbtn_preview');
		btn_prev.onclick    = function(){ textChanged = false; };
		btn_prev.onkeypress = function(){ textChanged = false; };

		// add change memory setter
		var edit_text   = document.getElementById('wikitext');
		edit_text.onchange = function(){
				textChanged = true; //global var
				summaryCheck();
		}
		edit_text.onkeyup  = summaryCheck;
		var summary = document.getElementById('summary');
		summary.onchange = summaryCheck;
		summary.onkeyup  = summaryCheck;

		// set focus
		edit_text.focus();
}

/**
 * Checks if a summary was entered - if not the style is changed
 *
 * @author Andreas Gohr <andi@splitbrain.org>
 */
function summaryCheck(){
    var sum = document.getElementById('summary');
    if(sum.value == ''){
      	sum.className='missing';
    }else{
      	sum.className='edit';
    }
}


/**
 * global variable for the locktimer
 */
var locktimerID;

/**
 * This starts a timer to remind the user of an expiring lock
 * Accepts the delay in seconds and a text to display.
 */
function init_locktimer(delay,txt){
  txt = escapeQuotes(txt);
  locktimerID = self.setTimeout("locktimer('"+txt+"')", delay*1000);
}

/**
 * This stops the timer and displays a message about the expiring lock
 */
function locktimer(txt){
  clearTimeout(locktimerID);
  alert(txt);
}