// ==UserScript==
// @version       1.0
// @include       *.fictionpress.com/s/*
// @namespace     ffnet
// @name          FictionPress story export script.
// @author        Alssn
// @description   Writes all chapters of the story on one page.
// @downloadURL https://update.greasyfork.icu/scripts/16076/FictionPress%20story%20export%20script.user.js
// @updateURL https://update.greasyfork.icu/scripts/16076/FictionPress%20story%20export%20script.meta.js
// ==/UserScript==

function find(expr)
{
	var posts = document.evaluate(expr, document, null,XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
	var postsArray = new Array();
	for (var i = 0; i < posts.snapshotLength; ++i) {
	     postsArray.push(posts.snapshotItem(i));
	}
	return postsArray;
}

function addButtons(){
// Adding buttons
	// res = find("//f[@id='f_size']");
	res = document.getElementById("f_size").parentNode;

	//creating links
	var addHeadersButton=document.createElement('a');
	addHeadersButton.href='javascript:';
	addHeadersButton.innerHTML='Headers';
	addHeadersButton.setAttribute('title','Add header to each chapter');
	var addIndexButton=document.createElement('a');
	addIndexButton.href='javascript:';
	addIndexButton.innerHTML='Index';
	addIndexButton.setAttribute('title','Create table of contents');
	var expAllButton=document.createElement('a');
	expAllButton.id='exportAllButton';
	expAllButton.href='javascript:';
	expAllButton.setAttribute('title','Show the whole story on one page');
	expAllButton.innerHTML='Story';
	var expButton=document.createElement('a');
	expButton.setAttribute('title','Show only text');
	expButton.href='javascript:';
	expButton.innerHTML='Text';
	// Adding listeners - that's the only way to do something after main code finsihed working;
	expAllButton.addEventListener('click',exportAll,false);
	expButton.addEventListener('click',exportCh,false);
	addHeadersButton.addEventListener('click',addHeaders,false);
	addIndexButton.addEventListener('click',addIndex,false);
	//fE and fA
	var e = document.createElement('span');
	e.setAttribute('style','font-family: serif;font-weight:bolder;color:#61a4e4');
	e.setAttribute('title','Export');
	e.innerHTML = "fE: ";
	var a = document.createElement('span');
	a.setAttribute('title','Add');
	a.setAttribute('style','font-family: serif;font-weight:bolder;color:#61a4e4');
	a.innerHTML = "fA: ";
	
	res.insertBefore(document.createTextNode(' '),res.firstChild);
	res.insertBefore(addIndexButton,res.firstChild);
	res.insertBefore(document.createTextNode(' '),res.firstChild);
	res.insertBefore(addHeadersButton,res.firstChild);
	res.insertBefore(a,res.firstChild);
	res.insertBefore(document.createTextNode(' '),res.firstChild);
	res.insertBefore(expButton,res.firstChild);
	res.insertBefore(document.createTextNode(' '),res.firstChild);
	res.insertBefore(expAllButton,res.firstChild);
	res.insertBefore(e,res.firstChild);
}

//Adding buttons to page;
addButtons();

//Adding table of contents
function addIndex(){
	var storytext = document.getElementById('storytext'); //Point of insert
	var chapters = document.getElementsByName('ffnee_chapter');
	//Creating base structure
	var index = document.createElement('div');
	index.innerHTML = '<h2>Table of contents</h2>';
	index.setAttribute('id','ffnee_index');
	var toC = document.createElement('ol');
	index.appendChild(toC);
	//Processing chapters
	for (var i=0;i<chapters.length;i++){
		var item = chapters.item(i); //chapter we are currently processing
		var id = item.getAttribute('id');
		var entry = document.createElement('li'); //Entry corresponding to the chapter in ToC
		entry.innerHTML = '<a href="#'+id+'">'+item.getAttribute('title')+'</a>';
		toC.appendChild(entry);
	}	
	storytext.insertBefore(index,storytext.firstChild);
}
//adding headers, as entered by author
function addHeaders(){
	var chapters = document.getElementsByName('ffnee_chapter');
	for (var i=0;i<chapters.length;i++){
	var item = chapters.item(i); //chapter to which we are adding a header
	var header = document.createElement('p');
	header.innerHTML = '<h2>Chapter '+(i+1)+': '+item.getAttribute('title')+'</h2>';
	item.insertBefore(header,item.firstChild);
	}
}

function exportCh(){
document.body.innerHTML='<div style=\'padding-left:2em;padding-right:2em;padding-top:1em;\'>'+document.getElementById('storytext').innerHTML+'</div>';
//Sadly, it is not possible to automatically copy text to clipboard in firefox without changing browser settings;
}
function exportAll(){
// Main actions   
	var expDiv = document.getElementById('exportAllButton');
	// Progress indicator
	var expText = expDiv.childNodes[0];
	var chapters = new Array();
	var hr=location.href;
	var chapterNumIndex=hr.search(/\/\d{1,3}\//);
	//Getting number of chapters
	var storyLength=getLength(); 
	if (storyLength == 1){
		expText.nodeValue = 'Oneshot';
		return;
	}
	var totalStoryLength = storyLength;//reference
	//launching retrieving of all chapters simultaneously
	for (var i=1;i<=storyLength;i++){
	  loadChapter(i, function(chapterHtml, chapterUrl){
			parseChapter(chapterHtml,chapterUrl);
			storyLength--;
      console.log(storyLength);
			if (storyLength == 0){
				parseStory();
			}
		});
	}
//Functions
    // Converting chapters' array into a whole;
	function parseStory(){
    console.log('parsing story');
		var numCh= chapters.length;
		//document.body.innerHTML=chapters[0];
		var appendNode=document.getElementById('storytext');
		appendNode.innerHTML= '';
    	for (var i=0;i<numCh;i++){
			//findHeader(chapters[i]);  //smart header search
			var st=chapters[i];
			st.setAttribute('name','ffnee_chapter');
			st.setAttribute('id','ffnee_ch'+i);
			if (i!=0){
				st.style.marginTop='10em';
			}
    		appendNode.appendChild(st);
    	}
    	expText.nodeValue='story(re)';
	}
	//  Getting number of chapters;
	function getLength(){
		var chNum=document.evaluate('//SELECT[@id=\'chap_select\']',document,null,XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
		if (chNum.snapshotLength>0){
			var numChapters = chNum.snapshotItem(0).length;
		}else{
			numChapters = 1;
		}
		return (numChapters);
	}
	// This function loads chapters and extracts chapter's number and title 
	function loadChapter(num, callback){
		var replStr='\/'+String(num)+'\/';
		var currentURL=hr.replace(/\/\d{1,3}\//,replStr);
				try{
		var req = new XMLHttpRequest();
		req.open('get',currentURL,true);
		req.onload= function(){
				callback(req.responseText,currentURL);
				};
		req.send();
		}catch (e) {
			console.log(e);
		}
	}
function parseChapter(chapterHtml, chapterURL){
		//getting chapter number
		var iChaptr = String(chapterURL.match(/\/\d{1,3}\//));
		var chapterNumber=iChaptr.substring(1,iChaptr.length-1);
		var t=document.createElement('div');
		t.innerHTML=chapterHtml;
		//extracting text only
  		var ev='//div[@id=\'storytext\']';
		var xpathResult = document.evaluate(ev,t,null,XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
     	chapterContent=document.createElement('div');
		chapterContent.setAttribute('title',getChapterName(t));
		chapterContent.innerHTML = xpathResult.snapshotItem(0).innerHTML;
		
		chapters[chapterNumber-1]=chapterContent;
		expText.nodeValue = 'Export: Chapter '+String(totalStoryLength-storyLength+1)+' out of '+totalStoryLength;
		function getChapterName(obj){
			var select = obj.getElementsByTagName('select')[1].getElementsByTagName('option');
			 for (var i=0;i<select.length;i++){
				 if (select[i].getAttribute('selected')!=null){
					 return(select[i].innerHTML.split(/[. ]{2}/)[1]);
				 }
			}
		}
	}
}