/* document.getElementsBySelector(selector)
   - returns an array of element objects from the current document
     matching the CSS selector. Selectors can contain element names, 
     class names and ids and can be nested. For example:
     
       elements = document.getElementsBySelect('div#main p a.external')
     
     Will return an array of all 'a' elements with 'external' in their 
     class attribute that are contained inside 'p' elements that are 
     contained inside the 'div' element which has id="main"

   New in version 0.4: Support for CSS2 and CSS3 attribute selectors:
   See http://www.w3.org/TR/css3-selectors/#attribute-selectors

   Version 0.4 - Simon Willison, March 25th 2003
   -- Works in Phoenix 0.5, Mozilla 1.3, Opera 7, Internet Explorer 6, Internet Explorer 5 on Windows
   -- Opera 7 fails 
*/

function getAllChildren(e) {
  // Returns all children of element. Workaround required for IE5/Windows. Ugh.
  return e.all ? e.all : e.getElementsByTagName('*');
}

document.getElementsBySelector = function(selector) {
  // Attempt to fail gracefully in lesser browsers
  if (!document.getElementsByTagName) {
    return new Array();
  }
  // Split selector in to tokens
  var tokens = selector.split(' ');
  var currentContext = new Array(document);
  for (var i = 0; i < tokens.length; i++) {
    token = tokens[i].replace(/^\s+/,'').replace(/\s+$/,'');;
    if (token.indexOf('#') > -1) {
      // Token is an ID selector
      var bits = token.split('#');
      var tagName = bits[0];
      var id = bits[1];
      var element = document.getElementById(id);
      if (tagName && element.nodeName.toLowerCase() != tagName) {
        // tag with that ID not found, return false
        return new Array();
      }
      // Set currentContext to contain just this element
      currentContext = new Array(element);
      continue; // Skip to next token
    }
    if (token.indexOf('.') > -1) {
      // Token contains a class selector
      var bits = token.split('.');
      var tagName = bits[0];
      var className = bits[1];
      if (!tagName) {
        tagName = '*';
      }
      // Get elements matching tag, filter them for class selector
      var found = new Array;
      var foundCount = 0;
      for (var h = 0; h < currentContext.length; h++) {
        var elements;
        if (tagName == '*') {
            elements = getAllChildren(currentContext[h]);
        } else {
            elements = currentContext[h].getElementsByTagName(tagName);
        }
        for (var j = 0; j < elements.length; j++) {
          found[foundCount++] = elements[j];
        }
      }
      currentContext = new Array;
      var currentContextIndex = 0;
      for (var k = 0; k < found.length; k++) {
        if (found[k].className && found[k].className.match(new RegExp('\\b'+className+'\\b'))) {
          currentContext[currentContextIndex++] = found[k];
        }
      }
      continue; // Skip to next token
    }
    // Code to deal with attribute selectors
    if (token.match(/^(\w*)\[(\w+)([=~\|\^\$\*]?)=?"?([^\]"]*)"?\]$/)) {
      var tagName = RegExp.$1;
      var attrName = RegExp.$2;
      var attrOperator = RegExp.$3;
      var attrValue = RegExp.$4;
      if (!tagName) {
        tagName = '*';
      }
      // Grab all of the tagName elements within current context
      var found = new Array;
      var foundCount = 0;
      for (var h = 0; h < currentContext.length; h++) {
        var elements;
        if (tagName == '*') {
            elements = getAllChildren(currentContext[h]);
        } else {
            elements = currentContext[h].getElementsByTagName(tagName);
        }
        for (var j = 0; j < elements.length; j++) {
          found[foundCount++] = elements[j];
        }
      }
      currentContext = new Array;
      var currentContextIndex = 0;
      var checkFunction; // This function will be used to filter the elements
      switch (attrOperator) {
        case '=': // Equality
          checkFunction = function(e) { return (e.getAttribute(attrName) == attrValue); };
          break;
        case '~': // Match one of space seperated words 
          checkFunction = function(e) { return (e.getAttribute(attrName).match(new RegExp('\\b'+attrValue+'\\b'))); };
          break;
        case '|': // Match start with value followed by optional hyphen
          checkFunction = function(e) { return (e.getAttribute(attrName).match(new RegExp('^'+attrValue+'-?'))); };
          break;
        case '^': // Match starts with value
          checkFunction = function(e) { return (e.getAttribute(attrName).indexOf(attrValue) == 0); };
          break;
        case '$': // Match ends with value - fails with "Warning" in Opera 7
          checkFunction = function(e) { return (e.getAttribute(attrName).lastIndexOf(attrValue) == e.getAttribute(attrName).length - attrValue.length); };
          break;
        case '*': // Match ends with value
          checkFunction = function(e) { return (e.getAttribute(attrName).indexOf(attrValue) > -1); };
          break;
        default :
          // Just test for existence of attribute
          checkFunction = function(e) { return e.getAttribute(attrName); };
      }
      currentContext = new Array;
      var currentContextIndex = 0;
      for (var k = 0; k < found.length; k++) {
        if (checkFunction(found[k])) {
          currentContext[currentContextIndex++] = found[k];
        }
      }
      // alert('Attribute Selector: '+tagName+' '+attrName+' '+attrOperator+' '+attrValue);
      continue; // Skip to next token
    }
    // If we get here, token is JUST an element (not a class or ID selector)
    tagName = token;
    var found = new Array;
    var foundCount = 0;
    for (var h = 0; h < currentContext.length; h++) {
      var elements = currentContext[h].getElementsByTagName(tagName);
      for (var j = 0; j < elements.length; j++) {
        found[foundCount++] = elements[j];
      }
    }
    currentContext = found;
  }
  return currentContext;
}

/* That revolting regular expression explained 
/^(\w+)\[(\w+)([=~\|\^\$\*]?)=?"?([^\]"]*)"?\]$/
  \---/  \---/\-------------/    \-------/
    |      |         |               |
    |      |         |           The value
    |      |    ~,|,^,$,* or =
    |   Attribute 
   Tag
*/



// boucle sur tout container de classe "secureimg". Teste toutes ses images contre les valeurs maximums autorisées (attributs maxw et maxh du container).
// si problème, l'image est redimensionnée à la bonne taille

function secureImg() {	
	secimg = document.getElementsBySelector(".secureimg");
	
	//alert("secimglength: "+secimg.length);
	
	for (j=0; j < secimg.length; j++) {
	
		var maxw = secimg[j].getAttribute('maxw');
		var maxh = secimg[j].getAttribute('maxh');
		
		pix = secimg[j].getElementsByTagName('img');
		
		//alert(j+" : "+pix.length);

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

			if (!checkImg(pix[i], maxw, maxh)) { resizeImg(pix[i], maxw, maxh); }
			
		}
	}
}

// boucle sur tout container de classe "secureimg". Teste toutes ses images contre les valeurs maximums autorisées (attributs maxw et maxh du container).
// si problème, l'image est marquée comme erronée et un message d'erreur est affiché. "False" est également renvoyé
// la fonction s'attend à trouver un "input" texte dans la même div que l'image... il ne doit également y avoir qu'une image par div
// ces restrictions existent pour permettre la mise à jour de la source de l'image
function validateImg(baseurl) {	
	var res = true;

	secimg = document.getElementsBySelector(".secureimg");
	
	for (j=0; j < secimg.length; j++) {
	
		var maxw = secimg[j].getAttribute('maxw');
		var maxh = secimg[j].getAttribute('maxh');
		
		pix = secimg[j].getElementsByTagName('img');
		input = secimg[j].getElementsByTagName('input')[0];
		url = input.value;
		//alert("w: "+pix[0].width+"  h: "+pix[0].height);
		pix[0].src = baseurl + url;
		//alert("w: "+pix[0].width+"  h: "+pix[0].height);
		var imgres = checkImg(pix[0], maxw, maxh);
		if (!imgres) { errorImg(secimg[j], pix[0], maxw, maxh); }
		else { pix[0].setAttribute('class', ""); }
		if (imgres = false) { res = false; }
		//alert("w: "+pix[0].width+"  h: "+pix[0].height);
	}
	
	return res;
}

// vérifie la taille de l'objet (image) passé en paramètre contre les valeurs maximales également passées en params.
// obj : l'objet image
// maxw/maxh : valeurs maximum (peut être null)
// renvoie un booléen indiquant si l'image est à la bonne taille ou pas
function checkImg(obj, maxw, maxh) {
	var res = true;
	var w = obj.width;
	var h = obj.height;
	//alert(maxw+","+maxh+" VS "+w+","+h);
	if (maxw != null && maxh != null) {
		if (w > maxw || h > maxh) {
			res = false;
		}
	}
	else if (maxw != null && w>maxw) {
		res = false;
	}
	else if (maxh != null && h>maxh) {
		res = false;
	}
	// si aucune des deux dimensions n'est précisée, on ne fait aucune modification
	
	return res;
}

// redimensionne l'image en fonction des valeurs maximum indiquées
function resizeImg(obj, maxw, maxh) {
	var w = obj.width;
	var h = obj.height;
	if (maxw != null && maxh != null) {
		var factor = maxw/maxh;
		pixfactor = w/h;
		if (w > maxw || h > maxh) {
			if (pixfactor >= factor) {	// largeur plus grande que hauteur
				obj.width = maxw;
			}
			else {	// hauteur plus grande que largeur
				obj.height = maxh;
			}
		}
	}
	else if (maxw != null && w>maxw) {
		obj.width = maxw;
	}
	else if (maxh != null && h>maxh) {
		obj.height = maxh;
	}
	// si aucune des deux dimensions n'est précisée, on ne fait aucune modification
}

// marque l'image comme erronée
// div : la div "secureimg" (pour pouvoir y placer de nouveaux éléments)
// obj : l'image
// maxw,maxh : les dimensions
function errorImg(div, obj, maxw, maxh) {
	obj.setAttribute('class', "erreur");
}