/******************************************************
    * jQuery plug-in
    * Easy Background Image Resizer
    * Developed by J.P. Given (http://johnpatrickgiven.com)
    * Some modifcations by Hay Kranen < http://www.haykranen.nl >
    * Useage: anyone so long as credit is left alone
******************************************************/

(function($) {
    var containerObj, center = false;

    // plugin definition
    $.fn.ezBgResize = function(center) {
        center = center || false;
        //console.log(center);
        // First position object
        containerObj = this;

        containerObj.css("visibility","hidden");

        $("body").css({
            "overflow-x":"hidden"
        });

        $(window).load(function() {
            resizeImage();
        });

        $(window).bind("resize",function() {
            resizeImage();
        });

    };

    function resizeImage() {
        $("body").css({
            "overflow-x":"auto"
        });

        containerObj.css({
            "position":"fixed",
            "top":"0px",
            "left":"0px",
            "z-index":"-1",
            "overflow":"hidden",
            "width":getWindowWidth() + "px",
            "height":getWindowHeight() + "px"
        });

        // Resize the img object to the proper ratio of the window.
        var iw = containerObj.children('img').width();
        var ih = containerObj.children('img').height();
        
        if ($(window).width() > $(window).height()) {
            //console.log(iw, ih);
            if (iw > ih) {
                var fRatio = iw/ih;
                containerObj.children('img').css("width",$(window).width() + "px");
                containerObj.children('img').css("height",Math.round($(window).width() * (1/fRatio)));

                var newIh = Math.round($(window).width() * (1/fRatio));

                if(newIh < $(window).height()) {
                    var fRatio = ih/iw;
                    containerObj.children('img').css("height",$(window).height());
                    containerObj.children('img').css("width",Math.round($(window).height() * (1/fRatio)));
                }
            } else {
                var fRatio = ih/iw;
                containerObj.children('img').css("height",$(window).height());
                containerObj.children('img').css("width",Math.round($(window).height() * (1/fRatio)));
            }
        } else {
            var fRatio = ih/iw;
            containerObj.children('img').css("height",$(window).height());
            containerObj.children('img').css("width",Math.round($(window).height() * (1/fRatio)));
        }

        containerObj.css("visibility","visible");

        // Center BG Image
        if (center) {
            containerObj.children('img').css("position","relative");

            if (containerObj.children('img').width() > containerObj.width()) {
                var wDiff = (containerObj.children('img').width() - containerObj.width()) / 2;
                containerObj.children('img').css("left", "-" + wDiff + "px");
            }
        }
    }

    // Dependable function to get Window Height
    function getWindowHeight() {
        var windowHeight = 0;
        if (typeof(window.innerHeight) == 'number') {
            windowHeight = window.innerHeight;
        }
        else {
            if (document.documentElement && document.documentElement.clientHeight) {
                windowHeight = document.documentElement.clientHeight;
            }
            else {
                if (document.body && document.body.clientHeight) {
                    windowHeight = document.body.clientHeight;
                }
            }
        }
        return windowHeight;
    };

    // Dependable function to get Window Width
    function getWindowWidth() {
        var windowWidth = 0;
        if (typeof(window.innerWidth) == 'number') {
            windowWidth = window.innerWidth;
        }
        else {
            if (document.documentElement && document.documentElement.clientWidth) {
                windowWidth = document.documentElement.clientWidth;
            }
            else {
                if (document.body && document.body.clientWidth) {
                    windowWidth = document.body.clientWidth;
                }
            }
        }
        return windowWidth;
    };
})(jQuery);




/* transicion imagenes **************************************************************/
// Speed of the automatic slideshow
var slideshowSpeed = 30000;

// Variable to store the images we need to set as background
// which also includes some text and url's.
var photos = [ {
		"title" : "",
		"image" : "imgpagina/1.jpg",
		"url" : "#",
		
	}, {
		"title" : "",
		"image" : "imgpagina/2.jpg",
		"url" : "#",
		
	}, {
		"title" : "",
		"image" : "imgpagina/3.jpg",
		"url" : "#",
		
	}
];



$(document).ready(function() {
		
	// Backwards navigation
	$("#back").click(function() {
		stopAnimation();
		navigate("back");
	});
	
	// Forward navigation
	$("#next").click(function() {
		stopAnimation();
		navigate("next");
	});
	
	var interval;
	$("#control").toggle(function(){
		stopAnimation();
	}, function() {
		// Change the background image to "pause"
		$(this).css({ "background-image" : "url(images/btn_pause.png)" });
		
		// Show the next image
		navigate("next");
		
		// Start playing the animation
		interval = setInterval(function() {
			navigate("next");
		}, slideshowSpeed);
	});
	
	
	var activeContainer = 1;	
	var currentImg = 0;
	var animating = false;
	var navigate = function(direction) {
		// Check if no animation is running. If it is, prevent the action
		if(animating) {
			return;
		}
		
		// Check which current image we need to show
		if(direction == "next") {
			currentImg++;
			if(currentImg == photos.length + 1) {
				currentImg = 1;
			}
		} else {
			currentImg--;
			if(currentImg == 0) {
				currentImg = photos.length;
			}
		}
		
		// Check which container we need to use
		var currentContainer = activeContainer;
		if(activeContainer == 1) {
			activeContainer = 2;
		} else {
			activeContainer = 1;
		}
		
		showImage(photos[currentImg - 1], currentContainer, activeContainer);
		
	};
	
	var currentZindex = -1;
	var showImage = function(photoObject, currentContainer, activeContainer) {
		animating = true;
		
		// Make sure the new container is always on the background
		currentZindex--;
		
		// Set the background image of the new active container
		$("#transicioimg" + activeContainer).css({
			"background-image" : "url(images/" + photoObject.image + ")",
			"display" : "block",
			"z-index" : currentZindex
		});
		
		// Hide the header text
		$("#headertxt").css({"display" : "none"});
		
		// Set the new header text
		$("#firstline").html(photoObject.firstline);
		$("#secondline")
			.attr("href", photoObject.url)
			.html(photoObject.secondline);
		$("#pictureduri")
			.attr("href", photoObject.url)
			.html(photoObject.title);
		
		
		// Fade out the current container
		// and display the header text when animation is complete
		$("#transicioimg" + currentContainer).fadeOut(function() {
			setTimeout(function() {
				$("#headertxt").css({"display" : "block"});
				animating = false;
			}, 500);
		});
	};
	
	var stopAnimation = function() {
		// Change the background image to "play"
		$("#control").css({ "background-image" : "url(images/btn_play.png)" });
		
		// Clear the interval
		clearInterval(interval);
	};
	
	// We should statically set the first image
	navigate("next");
	
	// Start playing the animation
	interval = setInterval(function() {
		navigate("next");
	}, slideshowSpeed);
	
});

/*tamaņo imagen*/
/*para fonndos*/
function updateBackground() {
screenWidth = $(window).width();
screenHeight = $(window).height();
var bg = jQuery("#bg");

// Proporcion horizontal/vertical. En este caso la imagen es cuadrada
ratio = 1;

if (screenWidth/screenHeight > ratio) {
$(bg).height("auto");
$(bg).width("100%");
} else {
$(bg).width("auto");
$(bg).height("100%");
}

// Si a la imagen le sobra anchura, la centramos a mano
if ($(bg).width() > 0) {
$(bg).css('left', (screenWidth - $(bg).width()) / 2);
}
}
$(document).ready(function() {
// Actualizamos el fondo al cargar la pagina
updateBackground();
$(window).bind("resize", function() {
// Y tambien cada vez que se redimensione el navegador
updateBackground();
});
});