/*
* © 2008 Benoît Pin – Centre de recherche en informatique – École des mines de Paris
* http://plinn.org
* Licence Creative Commons http://creativecommons.org/licenses/by-nc/2.0/
* $Id: photo_film_viewer.js 1303 2009-08-21 22:19:05Z pin $
* $URL: http://svn.luxia.fr/svn/labo/projects/zope/Portfolio/trunk/skins/photo_film_viewer.js $
*/

var FilmSlider;

(function(){

var keyLeft = 37, keyRight = 39;
var isTextMime = /^text\/.+/i;
var isAddToSelection = /.*\/add_to_selection$/;
var imgRequestedSize = /size=(\d+)/;
var DEFAULT_IMAGE_SIZES = [500, 600, 800];

FilmSlider = function(filmBar, slider, ctxInfos, image, toolbar, breadcrumbs) {
	var thisSlider = this;
	this.filmBar = filmBar;
	var film = filmBar.firstChild;
	if (film.nodeType == 3)
		film = film.nextSibling;
	this.film = film;
	this.slider = slider;
	this.rail = slider.parentNode;
	this.sliderSpeedRatio = undefined;
	this.sliderRatio = undefined;
	this.selectedSlide = undefined;
	this.selectedSlideInSelection = undefined;
	this.cartSlide = document.getElementById('cart_slide');
	this.image = image;
	this.stretchable = image.parentNode;
	this.viewMode = 'medium';
	
	this.buttons = new Array();
	this.toolbar = toolbar;
	var bcElements = breadcrumbs.getElementsByTagName('a');
	this.lastBCElement = bcElements[bcElements.length-1];
	var imgSrcParts = image.src.split('/');
	this.lastBCElement.innerHTML = imgSrcParts[imgSrcParts.length-2];
	
	var buttons = toolbar.getElementsByTagName('img');
	var b, name;
	for (var i=0 ; i<buttons.length ; i++) {
		b = buttons[i];
		name = b.getAttribute('name');
		if (name)
			this.buttons[name] = b;
	}
	
	this.pendingImage = new Image();
	this.pendingImage.onload = function() {
		thisSlider.refreshImage();
	};
	this.initialized = false;
	
	with(this.slider.style) {
		left='0';
		top='0';
	} 
	with(this.film.style) {
		left='0';
		top='0';
	}
	
	this.filmLength = ctxInfos.filmLength;
	this.center = ctxInfos.center;
	this.slideSize = ctxInfos.slideSize;
	this.ctxUrlTranslation = ctxInfos.ctxUrlTranslation;
	
	this.ddHandlers = {'down' : function(evt){thisSlider.mouseDownHandler(evt);},
					   'move' : function(evt){thisSlider.mouseMoveHandler(evt);},
					   'up' :   function(evt){thisSlider.mouseUpHandler(evt);},
					   'out' :  function(evt){thisSlider.mouseOutHandler(evt);}
					  };

	this.resizeSlider();
	this.addEventListeners()
};


FilmSlider.prototype.resizeSlider = function(evt) {
	var filmBarWidth = getObjectWidth(this.filmBar);
	if (!filmBarWidth){
		var thisSlider = this;
		addListener(window, 'load', function(evt){thisSlider.resizeSlider(evt);});
		return;
	}
	
	var filmWidth = this.slideSize * this.filmLength;
	var sliderRatio = this.sliderRatio =  filmBarWidth / filmWidth;
	var sliderWidth = filmBarWidth * sliderRatio;
	if (sliderRatio < 1) {
		this.rail.style.width = filmBarWidth + 'px';
		this.slider.style.width = Math.round(sliderWidth) + 'px';
		this.rail.style.display = 'block';
	  	this.rail.style.visibility = 'visible';
	}
	else {
		this.rail.style.display = 'none';
	  	this.rail.style.visibility = 'hidden';
	}
	
	this.winSize = {'width'  : getWindowWidth(),
					'height' : getWindowHeight()};
	this.maxRightPosition = filmBarWidth - sliderWidth
	this.sliderSpeedRatio = - (filmBarWidth - sliderWidth) / (filmWidth - filmBarWidth);
	if (!this.initialized) {
		this.centerSlide(this.center);
		this.selectedSlide = this.filmBar.getElementsByTagName('img')[this.center].parentNode;
		this.initialized = true;
	}
};

FilmSlider.prototype.fitToScreen = function(evt) {
	this._fitToScreen();
	var thisSlider = this;
	addListener(window, 'resize', function(evt){thisSlider._fitToScreen();});
};

FilmSlider.prototype._fitToScreen = function(evt) {
	var wh = getWindowHeight();
	var ch = document.body.clientHeight;
	var sh = getObjectHeight(this.stretchable);
	var newSize = sh + wh - ch;
	this.stretchable.style.height = newSize + 'px';
	
	var ratio = this.image.height / this.image.width;
	var bestFitSize = this.getBestFitSize(ratio);
	var currentSize = parseInt(imgRequestedSize.exec(this.image.src)[1]);
	if (currentSize != bestFitSize) {
		var src = this.image.src.replace(imgRequestedSize, 'size=' + bestFitSize);
		this.pendingImage.src = src;
	}
};

FilmSlider.prototype.getBestFitSize = function(ratio) {
	var fw = getObjectWidth(this.stretchable) - 1;
	var fh = getObjectHeight(this.stretchable) - 1;

	var i, irw, irh;
	if (ratio < 1) {
		for (i=DEFAULT_IMAGE_SIZES.length -1 ; i>0 ; i--) {
			irw = DEFAULT_IMAGE_SIZES[i];
			irh = irw * ratio;
			if (irw <= fw && irh <= fh)
				break;
		}
	}
	else {
		for (i=DEFAULT_IMAGE_SIZES.length -1 ; i>0 ; i--) {
			irh = DEFAULT_IMAGE_SIZES[i];
			irw = irh / ratio;
			if (irw <= fw && irh <= fh)
				break;
		}
	}
	return DEFAULT_IMAGE_SIZES[i];
};

FilmSlider.prototype.centerSlide = function(slideIndex) {
	if (this.sliderRatio > 1)
		return;
	var filmBarWidth = getObjectWidth(this.filmBar);
	var x = slideIndex * this.slideSize
	x = x - (filmBarWidth - this.slideSize) / 2.0;
	x = x * this.sliderSpeedRatio;
	var p = new Point( -x, 0 )
	this.setSliderPosition(p);
};

FilmSlider.prototype.setSliderPosition = function(point) {
	if(point.x < 0)
		point.x = 0;
	if (point.x > this.maxRightPosition)
		point.x = this.maxRightPosition;
	this.slider.style.left = point.x + 'px';
	this.setFilmPosition(point);
};

FilmSlider.prototype.setFilmPosition = function(point) {
	this.film.style.left = point.x / this.sliderSpeedRatio + 'px';
};

FilmSlider.prototype.getSliderPosition = function() {
	var x = parseInt(this.slider.style.left);
	var y = parseInt(this.slider.style.top);
	var p = new Point(x, y);
	return p;
};

FilmSlider.prototype.getFilmPosition = function() {
	var x = parseInt(this.film.style.left);
	var y = parseInt(this.film.style.top);
	var p = new Point(x, y);
	return p;
};

FilmSlider.prototype.loadSibling = function(previous) {
	var slide = null;
	if (previous) {
		slide = this.selectedSlide.parentNode.previousSibling;
		if (slide && slide.nodeType==3)
			slide = slide.previousSibling;
	}
	else {
		slide = this.selectedSlide.parentNode.nextSibling;
		if (slide && slide.nodeType==3)
			slide = slide.nextSibling;
	}
	
	if (!slide)
		return;
	else {
		var target = slide.getElementsByTagName('a')[0];
		raiseMouseEvent(target, 'click');
		var index = parseInt(target.getAttribute('portfolio:position'));
		this.centerSlide(index);
	}
};

FilmSlider.prototype.addEventListeners = function() {
	var thisSlider = this;
	addListener(window, 'resize', function(evt){thisSlider.resizeSlider(evt);});
	addListener(this.filmBar, 'click', function(evt){thisSlider.thumbnailClickHandler(evt);});
	addListener(this.toolbar, 'click', function(evt){thisSlider.toolbarClickHandler(evt);});
	addListener(window, 'load', function(evt){thisSlider.fitToScreen(evt);});
	
	// dd listeners
	addListener(this.slider, 'mousedown', this.ddHandlers['down']);
	if(browser.isDOM2Event){
		if (browser.isAppleWebKit) {
			this.filmBar.addEventListener('mousewheel', function(evt){thisSlider.mouseWheelHandler(evt);}, false);
		}
		else {
			addListener(this.filmBar, 'DOMMouseScroll', function(evt){thisSlider.mouseWheelHandler(evt);});
		}
	}
	else if (browser.isIE6up) {
		addListener(this.filmBar, 'mousewheel', function(evt){thisSlider.mouseWheelHandler(evt);});
	}
	
	addListener(document, 'keydown', function(evt){thisSlider.keyDownHandler(evt);});
	addListener(document, 'keypress', function(evt){thisSlider.keyPressHandler(evt);});
};


FilmSlider.prototype.mouseDownHandler = function(evt) {
	this.initialClickPoint = new Point(evt.clientX, evt.clientY);
	this.initialPosition = this.getSliderPosition();
	this.dragInProgress = true;
	addListener(document, 'mousemove', this.ddHandlers['move']);
	addListener(document, 'mouseup', this.ddHandlers['up']);
	addListener(document.body, 'mouseout', this.ddHandlers['out'])
	
};


FilmSlider.prototype.mouseMoveHandler = function(evt) {
	if(!this.dragInProgress)
		return;

	clearSelection();
	evt = getEventObject(evt);
	var currentPoint = new Point(evt.clientX, evt.clientY);
	var displacement = currentPoint.diff(this.initialClickPoint);
	this.setSliderPosition(this.initialPosition.add(displacement));
};

FilmSlider.prototype.mouseUpHandler = function(evt) {
	this.dragInProgress = false;
	evt = getEventObject(evt);
	this.mouseMoveHandler(evt);
};


FilmSlider.prototype.mouseOutHandler = function(evt) {
	evt = getEventObject(evt);
	var x = evt.clientX;
	var y = evt.clientY;
	if (x < 0 ||
		x > this.winSize['width'] ||
		y < 0 ||
		y > this.winSize['height']
		){
		this.mouseUpHandler(evt);
	}
};

FilmSlider.prototype.thumbnailClickHandler = function(evt) {
	var target = getTargetedObject(evt);
	while (target.tagName != 'A' && target != this.filmBar)
		target = target.parentNode;
	if (target.tagName != 'A')
		return;
	else {
		if (this.viewMode == 'full') {
			this.mosaique.unload();
			this.mosaique = null;
			this.viewMode = 'medium';
		}
		disableDefault(evt);
		disablePropagation(evt);
		target.blur();
		
		var imgBaseUrl = target.href;
		var canonicalImgUrl;
		if (this.ctxUrlTranslation[0])
			canonicalImgUrl = imgBaseUrl.replace(this.ctxUrlTranslation[0],
											 	 this.ctxUrlTranslation[1]);
		else
			canonicalImgUrl = imgBaseUrl;
		
		var ajaxUrl = imgBaseUrl + '/photo_view_ajax';
		var thisFS = this;
		
		//this.pendingImage.src = canonicalImgUrl + '/getResizedImage?size=600';
		var thumbnail = target.getElementsByTagName('IMG')[0];
		var bestFitSize = this.getBestFitSize(thumbnail.height/thumbnail.width);
		this.pendingImage.src = canonicalImgUrl + '/getResizedImage?size=' + bestFitSize;
		
		// update buttons
		var fullScreenLink = this.buttons['full_screen'].parentNode;
		fullScreenLink.href = canonicalImgUrl + '/zoom_view';

		var toggleSelectionBtn = this.buttons['toggle_selection'];
		var toggleSelectionLink = toggleSelectionBtn.parentNode;
		this.selectedSlideInSelection = (target.className=='selected');
		if (this.selectedSlideInSelection) {
			toggleSelectionBtn.src = portal_url() + '/unselect_flag_btn.gif';
			toggleSelectionBtn.alt = toggleSelectionLink.title = 'Retirer de la sélection';
			toggleSelectionLink.href = canonicalImgUrl + '/remove_to_selection';
		}
		else {
			toggleSelectionBtn.src = portal_url() + '/select_flag_btn.gif';
			toggleSelectionBtn.alt = toggleSelectionLink.title = 'Ajouter à la sélection';
			toggleSelectionLink.href = canonicalImgUrl + '/add_to_selection';
		}

		var showBuyableButtonLink = this.buttons['show_buyable'].parentNode;
		showBuyableButtonLink.href = canonicalImgUrl + '/get_slide_buyable_items';
		this.cartSlide.innerHTML = '';
		this.cartSlide.style.visibility='hidden';
		
		
		var metadataButton = this.buttons['edit_metadata']
		if (metadataButton) {
			var metadataEditLink = metadataButton.parentNode;
			metadataEditLink.href = canonicalImgUrl + '/photo_edit_form'
		}
		

		var req = new XMLHttpRequest();
		req.onreadystatechange = function() {
			switch (req.readyState) {
				case 1 :
					showProgressImage();
					break;
				case 2 :
					try {
						if (! isTextMime.exec(req.getResponseHeader('Content-Type'))) {
							req.onreadystatechange = null;
							req.abort();
							hideProgressImage();
							window.location.href = thisFS._fallBackUrl;
						}
					}
					catch(e){}
					break;
				case 4 :
					hideProgressImage();
					if (req.status == '200')
						thisFS.populateViewer(req);
					else
						//window.location.href = target.href;
						console.error(ajaxUrl);

			};
		};

		req.open("GET", ajaxUrl, true);
		req.send(null);
		
		// update old displayed slide className
		var className = this.selectedSlide.className;
		var classes = className.split(' ');
		var newClasses = new Array();
		var name;

		for (i in classes) {
			name = classes[i];
			if (name == 'displayed')
				continue;
			else
				newClasses.push(name);
		}
		
		this.selectedSlide.className = newClasses.join(' ')
		
		// hightlight new displayed slide
		this.selectedSlide = target;
		className = this.selectedSlide.className;
		classes = className.split(' ');
		classes.push('displayed');
		this.selectedSlide.className = classes.join(' ');
	}
};

FilmSlider.prototype.toolbarClickHandler = function(evt) {
	var target = getTargetedObject(evt);
	if(target.tagName == 'IMG' && target.getAttribute('name')){
		switch(target.getAttribute('name')) {
			case 'previous' :
				disableDefault(evt);
				disablePropagation(evt);
				var button = target;
				var link = button.parentNode;
				link.blur();
				this.loadSibling(true);
				break;
			case 'next' : 
				disableDefault(evt);
				disablePropagation(evt);
				var button = target;
				var link = button.parentNode;
				link.blur();
				this.loadSibling(false);
				break;
			case 'full_screen':
				disableDefault(evt);
				disablePropagation(evt);
				target.parentNode.blur();
				if (this.viewMode == 'full') {
					this.mosaique.unload();
					this.mosaique = null;
					this.viewMode = 'medium';
					return;
				}
				var main = document.getElementById('photo_viewer');
				var url = target.parentNode.href;
				url = url.substring(0, url.length - '/zoom_view'.length);
				var margins = {'top':0, 'right':-1, 'bottom':0, 'left':0};
				this.mosaique = new Mosaique(main, url, margins);
				this.viewMode = 'full';
				break;

			case 'toggle_selection':
				disableDefault(evt);
				disablePropagation(evt);
				var button = target;
				var link = button.parentNode;
				link.blur();
				
				var req = new XMLHttpRequest();
				var url = link.href;
				req.open("POST", url, true);
				req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");
				req.send("ajax=1");
				
				// toggle button
				var parts = url.split('/');
				var canonicalImgUrl = parts.slice(0, parts.length-1).join('/');
				
				if (isAddToSelection.test(url)) {
					button.src = portal_url() + '/unselect_flag_btn.gif';
					button.alt = link.title = 'Retirer de la sélection';
					link.href = canonicalImgUrl + '/remove_to_selection';
					this.selectedSlide.className = 'selected displayed';
					this.image.parentNode.className = 'selected';
					this.selectedSlideInSelection = true;
				}
				else {
					button.src = portal_url() + '/select_flag_btn.gif';
					button.alt = link.title = 'Ajouter à la sélection';
					link.href = canonicalImgUrl + '/add_to_selection';
					this.selectedSlide.className = 'displayed';
					this.image.parentNode.className = '';
					this.selectedSlideInSelection = false;
				}
				break;
			
			case 'show_buyable':
				disableDefault(evt);
				disablePropagation(evt);
				var button = target;
				var link = button.parentNode;
				link.blur();
				var slide = this.cartSlide;
				slide.innerHTML = '';
				slide.style.visibility = 'visible';
				var cw = new CartWidget(slide, link.href);
				cw.onCancel = function() {
					CartWidget.prototype.onCancel.apply(this);
					slide.style.visibility = 'hidden';
				};
				cw.onAfterConfirm = function() {
					slide.style.visibility = 'hidden';
				};
				break;
				
				
				
			
			/*
			case 'edit_metadata' :
				disableDefault(evt);
				disablePropagation(evt);
				target.blur();
				if (this.viewMode == 'full') {
					this.mosaique.unload();
					this.mosaique = null;
					this.viewMode = 'medium';
					return;
				}
				var fi = new FragmentImporter(absolute_url());
				fi.useMacro('metadata_edit_form_macros', 'iptc', 'image_metadata');
				break;
			*/
		}
	}
};


if(browser.isDOM2Event){
	if (browser.isAppleWebKit) {
		FilmSlider.prototype.mouseWheelHandler = function(evt) {
			disableDefault(evt);
			var pos = this.getSliderPosition();
			pos.x -= evt.wheelDelta / 40;
			this.setSliderPosition(pos);
		};
	}
	else {
		FilmSlider.prototype.mouseWheelHandler = function(evt) {
			disableDefault(evt);
			var pos = this.getSliderPosition();
			pos.x += evt.detail * 3;
			this.setSliderPosition(pos);
		};
	}
}
else if (browser.isIE6up) {
	FilmSlider.prototype.mouseWheelHandler = function() {
		var evt = window.event;
		evt.returnValue = false;
		var pos = this.getSliderPosition();
		pos.x -= evt.wheelDelta / 40;
		this.setSliderPosition(pos);
	};
}

FilmSlider.prototype.keyDownHandler = function(evt) {
	var evt = getEventObject(evt);
	switch (evt.keyCode) {
		case keyLeft :
			this.loadSibling(true);
			break;
		case keyRight :
			this.loadSibling(false);
			break;
		default:
			return;
	}
};


FilmSlider.prototype.keyPressHandler = function(evt) {
	var target = getTargetedObject(evt);
	if (target.tagName == 'INPUT' || target.tagName== 'TEXTAREA')
		return;
	var evt = evt = getEventObject(evt);
	evt = getEventObject(evt);
	var charPress = String.fromCharCode((evt.keyCode) ? evt.keyCode : evt.which);
	switch(charPress) {
		case 'f':
		case 'F':
			raiseMouseEvent(this.buttons['full_screen'], 'click');
			break;
	}
};

FilmSlider.prototype.populateViewer = function(req) {
	var elements = req.responseXML.documentElement.childNodes;
	for(var i=0 ; i < elements.length ; i++ ) {
		element = elements[i];
		switch (element.nodeName) {
			case 'fragment' :
				var dest = document.getElementById(element.getAttribute('id'));
				dest.innerHTML = element.firstChild.nodeValue;
				break;
			case 'imageattributes' :
				var link = this.buttons['back_to_portfolio'].parentNode;
				link.href = element.getAttribute('backToContextUrl');
				link = this.buttons['show_buyable'].parentNode;
				var buyable = element.getAttribute('buyable');
				if(buyable == 'True')
					link.className = null;
				else if(buyable == 'False')
					link.className = 'hidden';
				this.image.alt = element.getAttribute('alt');
				this.lastBCElement.href = element.getAttribute('lastBcUrl');
				this.lastBCElement.innerHTML = element.getAttribute('img_id');
				break;
		}
	}
};

FilmSlider.prototype.refreshImage = function() {
	this.image.style.visibility = 'hidden';
	this.image.src = this.pendingImage.src;
	this.image.width = this.pendingImage.width;
	this.image.height = this.pendingImage.height;
	this.image.style.visibility = 'visible';
	if (this.selectedSlideInSelection)
		this.image.parentNode.className = 'selected';
	else
		this.image.parentNode.className = '';
};

FilmSlider.prototype.startSlideShow = function() {
	this.slideShowSlide = this.selectedSlide;
	this.nextSlideShowSlide = this.selectedSlide;
	return this.slideShowSlide.href;
};

FilmSlider.prototype.slideShowNext = function() {
	this.slideShowSlide = this.nextSlideShowSlide;
	var nextSlide = this.slideShowSlide.parentNode.nextSibling;
	if (nextSlide && nextSlide.nodeType==3)
		nextSlide = nextSlide.nextSibling;	

	if (nextSlide) {
		nextSlide = nextSlide.getElementsByTagName('a')[0];
		this.nextSlideShowSlide = nextSlide;
		return nextSlide.href;
	}
	else {
		var row = this.slideShowSlide.parentNode.parentNode;
		var first = row.firstChild;
		if (first.nodeType==3)
			first = first.nextSibling;
		this.nextSlideShowSlide = first.getElementsByTagName('a')[0];
		return this.nextSlideShowSlide.href;
	}
};

FilmSlider.prototype.stopSlideShow = function() {
	raiseMouseEvent(this.slideShowSlide, 'click');
	var index = parseInt(this.selectedSlide.getAttribute('portfolio:position'));
	this.centerSlide(index);
};


/* UTILS */
function Point(x, y) {
	this.x = Math.round(x);
	this.y = Math.round(y);
}
Point.prototype.diff = function(point) { return new Point(this.x - point.x, this.y - point.y); };
Point.prototype.add = function(point) { return new Point(this.x + point.x, this.y + point.y); };
Point.prototype.mul = function(k) { return new Point(this.x * k, this.y *k)};
Point.prototype.toString = function() { return "(" + String(this.x) + ", " + String(this.y) + ")"; };

})();