// ==UserScript==
// @name MAM Ratio Protect BETA
// @namespace yyyzzz999
// @author yyyzzz999
// @description Warns about downloading based on resulting Ratio Loss due to forgetting to buy w/FL
// @include https://www.myanonamouse.net/t/*
// @version 1.62
// @description (12/12/20)
// @grant none
// @run-at document-end
// @downloadURL none
// ==/UserScript==
// Many Thanks to GardenShade & ooglyboogly for advice, testing, and code contributions!
/*jshint esversion: 6 */
/*eslint no-multi-spaces:0 */ //stop pestering me 'cause I learned to type with double spaces!
// Release downloadURL:  https://greasyfork.org/en/scripts/416189-mam-ratio-protect

let xhr; //Used in body and functions
let rcRow;
let UserObj;
//let tHash = ""; //Hexcode hash for this torrent

let DEBUG =0; // Debugging mode on (1) or off (0) added in (v1.54) verbose (2) (v1.6)

//Hide banner on book pages if not using MAM+
//document.getElementById("msb").style.display = "none";

// Functions:

//https://blog.abelotech.com/posts/number-currency-formatting-javascript/
function comma(num) { // add commas to a number
  return num.toString().replace(/(\d)(?=(\d{3})+(?!\d))/g, '$1,')
}

function formatBytes(a,b=2){if(0===a)return"0 Bytes";
		const c=0>b?0:b,d=Math.floor(Math.log(a)/Math.log(1024));
		return parseFloat((a/Math.pow(1024,d)).toFixed(c))+" "+["Bytes","KB","MB","GB","TB","PB","EB","ZB","YB"][d]}
		
https://blog.abelotech.com/posts/number-currency-formatting-javascript/		

/** hacked from MAM+ 4.2.20 Line 222
    Always inserted line at beginning or end of page block until removed parentElement before insertAdjacentHTML
     * Add a new TorDetRow and return the inner div
     * @param tar The row to be targetted
     * @param label The name to be displayed for the new row
     * @param rowClass The row's classname (should start with mp_)
     */
     function myaddTorDetailsRow(tar, label, rowClass) {
        if (tar == null ) {  //why originally === assignment?
            throw new Error(`myAdd Tor Details Row: empty node @ ${tar}`);
        }
        else {
            tar.insertAdjacentHTML('beforebegin', // changed from afterbegin so I can position before .torDetBottom as nth child changes w/MAM+
			// and Torrent: ratio line has no id or unique CSS
			`<div class="torDetRow"><div class="torDetLeft">${label}</div><div class="torDetRight ${rowClass}"><span class="flex"></span></div></div>`);
            return document.querySelector(`.${rowClass} .flex`);
        }
}

/*
https://stackoverflow.com/questions/629671/how-can-i-intercept-xmlhttprequests-from-a-greasemonkey-script
	Spy on all AJAX request/response to see when FL is purchased
	This works in Basilisk Scratchpad, Tampermonkey w/Firefox, but not Greasmonkey 3.9 in Basilisk
	Problem: it also looks at our own AJAX request so we return early if we see the user data object
*/

let ResultObj; // I scoped this out of the function in case I want to reference it later in other contexts/functions
// This is where we react after FL purchase
(function(open) {
    XMLHttpRequest.prototype.open = function() {
        this.addEventListener("readystatechange", function() {
        if (DEBUG >2) console.log(this.readyState);
		if (DEBUG >2) console.log(this.responseText);
			if (this.readyState == 4 && this.status == 200) {
				ResultObj = JSON.parse(this.responseText);
				if ( ResultObj.uid ) return; //if getting user data in this script w/ fetch('/jsonLoad.php')
				if (DEBUG >1) console.log("Response: " + this.responseText);
				if (DEBUG) console.log("FL Purchase status: " + ResultObj.success);
				if (ResultObj.success) { // Return download button etc. to normal after FL purchase (v1.6)
					dlBtn.innerHTML = "Download";
					dlBtn.style.backgroundColor="dodgerblue";
					dlLabel.innerHTML = ""; //Clear ratio loss
					//rcRow.display = "none"; //Why no work?
					rcRow.hidden = "true"; //Why no work?
					rcRow.textContent = "";
					if (DEBUG) console.log("Seedbonus: " + ResultObj.seedbonus);
					if( document.getElementById("tmFW") && ResultObj.FLleft) // If FL Wedges: are displayed in top menu & we have new value so update it
					document.getElementById("tmFW").textContent=ResultObj.textContent="FL Wedges: "  + ResultObj.FLleft;
					// Why doesn't MAM already do this?
				}
			}
        }, false);
        open.apply(this, arguments);
    };
})(XMLHttpRequest.prototype.open);

// Main Program

// The download text area
let dlBtn = document.getElementById("tddl");
// The unused label area above the download text
let dlLabel = document.querySelector("#download .torDetInnerTop");
// Would become ratio
   let rnew = 0; // FALSE
if (document.getElementById("ratio").textContent.split(" ")[1].match(/become/) ) {
    rnew = document.getElementById("ratio").textContent.split(" ")[2].replace(/,/g,""); // (v1.54)
// VIP expires date caused rdiff to be NaN in v1.53 bcause text crept in in v1.52
	}
if (DEBUG) console.log("rnew= " + rnew);

//let rnew = document.getElementById("ratio").textContent.split("become ")[1].replace(/,/g,""); // broke w/On list for next FL pick
//let rnew = document.getElementById("ratio").textContent.match(/\d*\,?\d+\.\d+/)[0].replace(/,/g,"''); //breaks at 1,000,000bp
if (DEBUG) console.log("rnew= " + rnew); // For debugging
// Current ratio - Version 1.52 and earlier broke when a ratio has a comma
let rcur = document.getElementById("tmR").textContent.replace(/,/g,"");
if (DEBUG) console.log("rcur= " + rcur); // For debugging
// Seeding or downloading TRUE if "Actively Seeding" etc.
let seeding = document.getElementById('DLhistory');
if (DEBUG) console.log("seeding= " + seeding);

// Available FL wedges - for future use... (>v1.6)
// Only visible if set on MAM in Preferences, Style, Main Menu, Top Menu
//let wedgeAvail = document.getElementById('tmFW').textContent.split(":")[1].trim(); //only works if added to top menu
// Probably more robust way of finding current FL, so use if avail.
//if(wedgeAvail) console.log("tm wedgeAvail= " + wedgeAvail);
// ELSE try finding in drop downs with Rel XPath //a[contains(text(),'FL Wedges: ')] or
// CSS ul:nth-child(1) li.mmUserStats ul.hidden:nth-child(2) li:nth-child(7) > a:nth-child(1)
// let wedgeAvail = document.querySelector('[aria-labelledby="userMenu"] li:nth-of-type(7)').textContent.split(':')[1].trim();
// or document.querySelector("ul:nth-child(1) li.mmUserStats ul.hidden:nth-child(2) li:nth-child(7) > a:nth-child(1)")


// Only run the code if the new ratio exists and we found the current one
if(rnew && rcur){
    let rdiff = rcur-rnew; // Loss in ratio after download (if error in old browser use var instead of let)
if (DEBUG) console.log("rdiff= " + rdiff); // For debugging

  if (seeding == null ) { // if NOT already seeding, downloading or VIP expires (v1.54) 
        dlLabel.innerHTML = `Ratio loss ${rdiff.toFixed(4)}`; //changed from toPrecision(5) (v1.54)
        dlLabel.style.fontWeight = "normal"; //To distinguish from BOLD Titles
		
		// Add line under Torrent: detail for Cost data
		rcRow = myaddTorDetailsRow(document.querySelector("div[class='torDetBottom']"), 'Cost to Restore Ratio', 'mp_rcRow');
		if (DEBUG) console.log("rcRow.innerHTML= " + rcRow.innerHTML);

		// Get user data for ratio numerator and denominator
		 
		// Move to onlick function, that will be placed in rcRow.innerHTML here...
		if (DEBUG) console.log("Fetching user data");
		fetch('/jsonLoad.php')
		.then(response => response.json())
		.then(data => {
			//console.log(data);
			//if (DEBUG) console.log("U/D:",data.uploaded,data.downloaded);
			// Calculate & Display cost of download w/o FL
			let x=document.querySelector("div[id='size'] span").textContent.split(/\s+/); //Why didn't split(" ") work?
			if (DEBUG) console.log("x = " + x + ", x[0]= " + x[0] + ", x[1]= " + x[1] );
			const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB'];  // I want to be around when we start sharing TB+ collections! ;-)
			let tsize = x[0] * Math.pow(1024, sizes.indexOf(x[1])); 
			// Convert human notation to bytes, only used once so didn't make it a function
			if (DEBUG) console.log("tsize = " + tsize);
			let recovU = (data.uploaded*(data.downloaded+tsize))/data.downloaded - data.uploaded;
			rcRow.textContent = "To recover your current ratio you would need to upload about " + formatBytes(recovU) + ". This would cost about " +
            comma(Math.floor(125*recovU/268435456)) + " bonus points if completely obtained in the site store.  " +
            "Contributing to the vault gives you on average almost one FL wedge per day at a cost of as little as 200 bonus points each.  ";
            if (DEBUG) rcRow.textContent += "Calculations based on Up/Down ratio= " + data.uploaded + "/" + data.downloaded +
            ", aproximately " + comma(Math.floor(recovU)) + " future upload bytes, and a download size of " + comma(tsize) + " bytes.";
			}) // .textContent above prob. should be replaced with innerHTML for formatting and links etc.
		.catch((error) => {
		console.error('Error:', error);
		rcRow.textContent = "Try at most one reload to resolve error: " + error ;
// Produced on 404: SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data
		});
		 
		 /* replaced with above fetch()
		 // API doc https://www.myanonamouse.net/api/endpoint.php/2/jsonLoad.php
         xhr = new XMLHttpRequest();
         xhr.addEventListener("readystatechange", processRequest, false);
         xhr.onreadystatechange = processRequest;
         xhr.open('GET', "/jsonLoad.php", true); // Arguments seem to be ignored, but returns current user data parsed by processRequest
         xhr.send();
		 
		 */

		 /* This doesn't work due to timing issues, and scrapped due to server load restrictions, sigh
		 // Get exact torrent size via HASH
		 document.querySelector("#filelistLink").dispatchEvent(new MouseEvent('click'));
		 //setTimeout(function(){
		 document.querySelector("#filelistLink").dispatchEvent(new MouseEvent('click'));
		 //}, 333); // Wait 1/3 second and rehide the hash
		 let tHash = "";
		 if ( document.querySelector("div[id='filesDisplay'] h2") != null ) 
		 tHash = document.querySelector("div[id='filesDisplay'] h2").textContent.split(":")[1].trim(); 
		 //doesn't work until "View Filelist" clicked and https://www.myanonamouse.net/tor/filelist.php?torrentid=nnnnnn returns html
		 if (DEBUG) console.log("tHash= " + tHash);
		 */


  }

    // Change this .3 number to your "trivial ratio loss" amount
    // These changes will always happen if the ratio conditions are met
    if(rdiff > 0.3){
        dlBtn.style.backgroundColor="SpringGreen";
        dlBtn.style.color="black";
    }

    // Change this 1 number to your I never want to dl w/o FL ratio loss amount
    if(rdiff > 1){
        dlBtn.style.backgroundColor="Red";
        // Disable link to prevent download
//        dlBtn.style.pointerEvents="none";
//	Uncomment (remove //) above line to disable the download button
        // maybe hide the button, and add the Ratio Loss warning in its place?
        dlBtn.innerHTML = "FL Recommended";
        dlLabel.style.fontWeight = "bold";
    // Change this .5 number to your "I need to think about using a FL ratio loss" amount
    }else if(rdiff > 0.5){
        dlBtn.style.backgroundColor="Orange";
    }
}

/* Replaced this code with newer fetch()
//function copied from https://www.kirupa.com/html5/making_http_requests_js.htm
// Used to query AJAX JSON JavaObjects to get more accurate numbers than shown on page
function processRequest(e) {
//console.log(xhr.responseText,xhr.readyState,xhr.status);
    if (xhr.readyState == 4 && xhr.status == 200) {
		UserObj = JSON.parse(xhr.responseText); 
		// Get upload and download to the byte here, and calculations then placed in rcRow.textContent
		if (DEBUG) console.log("Uploaded: " + UserObj.uploaded);
		if (DEBUG) console.log("Downloaded: " + UserObj.downloaded);
		if (DEBUG >1) console.log("Response: " + xhr.responseText);
		rcRow.textContent = "Calculations based on Up/Down= " + UserObj.uploaded + "/" + UserObj.downloaded + " unfinished.";
		if (DEBUG) console.log("processRequest can see rcRow.textContent= " + rcRow.textContent);
console.log(xhr.responseText);
    }
}
*/