/*
PDFObject, copyright (C) 2008 Philip Hutchison (pipwerks.com)
Documentation and examples are at www.pdfobject.com
Version 1.2, April 2011
MIT style license
*/

/*global ActiveXObject, window */


var PDFObject = function (obj){

if(!obj || !obj.url){ return false; }

var pdfobjectversion = "1.2",
//Set reasonable defaults
id = obj.id || false,
width = obj.width || "100%",
height = obj.height || "100%",
pdfOpenParams = obj.pdfOpenParams,
url,
pluginTypeFound;


/* ----------------------------------------------------
Supporting functions
---------------------------------------------------- */

//Tests specifically for Adobe Reader (aka Acrobat) in Internet Explorer
var hasReaderActiveX = function (){

var axObj = null;

if (window.ActiveXObject) {

axObj = new ActiveXObject("AcroPDF.PDF");

//If "AcroPDF.PDF" didn't work, try "PDF.PdfCtrl"
if(!axObj){
axObj = new ActiveXObject("PDF.PdfCtrl");
}

//If either "AcroPDF.PDF" or "PDF.PdfCtrl" are found, return true
if (axObj !== null) {
return true;
}

}

//If you got to this point, there's no ActiveXObject for PDFs
return false;

};



//Tests specifically for Adobe Reader (aka Adobe Acrobat) in non-IE browsers
var hasReader = function (){

var i,
n = navigator.plugins,
count = n.length,
regx = /Adobe Reader|Adobe PDF|Acrobat/gi;

for(i=0; i<count; i++){
if(regx.test(n[i].name)){
return true;
}
}

return false;

};


//Detects unbranded PDF support
var hasGeneric = function (){
var plugin = navigator.mimeTypes["application/pdf"];
return (plugin && plugin.enabledPlugin);
};


//Determines what kind of PDF support is available: Adobe or generic
var pluginFound = function (){

var type = null;

if(hasReader() || hasReaderActiveX()){

type = "Adobe";

} else if(hasGeneric()) {

type = "generic";

}

return type;

};


//If setting PDF to fill page, need to handle some CSS first
var setCssForFullWindowPdf = function (){

var html = document.getElementsByTagName("html");
if(!html){ return false; }

var html_style = html[0].style,
body_style = document.body.style;

html_style.height = "100%";
html_style.overflow = "hidden";
body_style.margin = "0";
body_style.padding = "0";
body_style.height = "100%";
body_style.overflow = "hidden";

};


//Creating a querystring for using PDF Open parameters when embedding PDF
var buildQueryString = function(pdfParams){

var string = "",
prop;

if(!pdfParams){ return string; }

for (prop in pdfParams) {

if (pdfParams.hasOwnProperty(prop)) {

string += prop + "=";

if(prop === "search") {

string += encodeURI(pdfParams[prop]);

} else {

string += pdfParams[prop];

}

string += "&";

}

}

//Remove last ampersand
return string.slice(0, string.length - 1);

};


//Simple function for returning values from PDFObject
var get = function(prop){

var value = null;

switch(prop){
case "url" : value = url; break;
case "id" : value = id; break;
case "width" : value = width; break;
case "height" : value = height; break;
case "pdfOpenParams" : value = pdfOpenParams; break;
case "pluginTypeFound" : value = pluginTypeFound; break;
case "pdfobjectversion" : value = pdfobjectversion; break;
}

return value;

};


/* ----------------------------------------------------
PDF Embedding functions
---------------------------------------------------- */


var embed = function(targetID){

if(!pluginTypeFound){ return false; }

var targetNode = null;

if(targetID){

//Allow users to pass an element OR an element's ID
targetNode = (targetID.nodeType && targetID.nodeType === 1) ? targetID : document.getElementById(targetID);

//Ensure target element is found in document before continuing
if(!targetNode){ return false; }

} else {

targetNode = document.body;
setCssForFullWindowPdf();
width = "100%";
height = "100%";

}

targetNode.innerHTML = '<object data="' +url +'" type="application/pdf" width="' +width +'" height="' +height +'"></object>';

return targetNode.getElementsByTagName("object")[0];

};

//The hash (#) prevents odd behavior in Windows
//Append optional Adobe params for opening document
url = encodeURI(obj.url) + "#" + buildQueryString(pdfOpenParams);
pluginTypeFound = pluginFound();

this.get = function(prop){ return get(prop); };
this.embed = function(id){ return embed(id); };

return this;

};