// ==UserScript==
// @name MAM Ratio Protect BETA
// @namespace yyyzzz999
// @author yyyzzz999
// @description (5/22/22) Warns about downloading based on resulting Ratio Loss due to forgetting to buy w/FL
// @match https://www.myanonamouse.net/t/*
// @version 1.94
// @license MIT
// @grant none
// @run-at document-end
// @downloadURL none
// ==/UserScript==
// Many Thanks to GardenShade, yyywwwyyyhhh, sora12192, Onigiri & 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!
/*eslint curly: ["error", "multi-line"]*/ // Don't nag about missing {} after if's that do only one thing.
// Release downloadURL:  https://greasyfork.org/en/scripts/416189-mam-ratio-protect

//let xhr;
let rcRow; //Used in body and functions

//let tHash = ""; //Hexcode hash for this torrent

let DEBUG =1; // Debugging mode on (1) or off (0) added in (v1.54) verbose (2) (v1.6)
let CICON =1; // Custome Favorite icons is ON by default, change this to 0 to keep the default icon on all tabs

/* Easter Egg bonus features, uncomment to use! */
//Hide banner on book pages if not using MAM+
//document.getElementById("msb").style.display = "none";

//Re-title tab to make it easier to find a book tab! v1.66
document.title=document.title.replace('Details for torrent "', '');
//This makes Bookmark titles easier to read as well!
// See also: https://greasyfork.org/en/scripts/418820-mam-user-page-re-title
// and https://greasyfork.org/en/scripts/418992-mam-request-page-re-title
// and https://greasyfork.org/en/scripts/417852-mam-site-store-fix
// and https://greasyfork.org/en/scripts/441976-mam-banner-shrink

/* End Easter Eggs */

// 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","KiB","MiB","GiB","TiB","PiB","EiB","ZiB","YiB"][d]}

/** 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 @ ${tar}`);
        }
        else {
            tar.insertAdjacentHTML('beforebegin', // changed from afterbegin so I can position before .torDetBottom as nth child changes w/MAM+
			// and Torrent: ratio line has no id or unique CSS
			`<div class="torDetRow" id="Mrp_row"><div class="torDetLeft">${label}</div><div class="torDetRight ${rowClass}"><span id="mp_foobar"></span></div></div>`);
            return document.querySelector(`.${rowClass} #mp_foobar`);
        }
}

/*
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("xhr status: " + ResultObj.success);
				if (ResultObj.success && ResultObj.type == "personal FL") { // Return download button etc. to normal after FL purchase (v1.6)
					// bookmark operations return {"success": true, "action": "add"} Specific FL test in v1.63!
					dlBtn.innerHTML = "Download";
					dlBtn.style.backgroundColor="dodgerblue";
                    dlBtn.style.color="white";         // V1.9 restore white text color showing button active again
                    dlBtn.style.pointerEvents = 'auto' //NEW in V1.9 restore DL link
					dlLabel.innerHTML = ""; //Clear ratio loss
                    if (CICON) favi("5");  // Purple means FL purchased, but not yet downloading or seeding
					//document.getElementById("Mrp_row").style.visibility = "hidden"; //Wastes space
                    document.getElementById("Mrp_row").style.display = "none"; //Restore w/ "block"
					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);

// Function to change the FAVICON to one matching a filename fn
function favi(fn,un) {
    un = un || 164109;
    link.href = 'https://cdn.myanonamouse.net/imagebucket/' + un + '/' + fn + '.png' ;
//    link.href = 'https://cdn.myanonamouse.net/imagebucket/164109/' + fn + '.png' ;
/*  Many filenames are simply the CGA color number 1-15 (low blue to white)
    https://en.wikipedia.org/wiki/Web_colors
    It would be easy to change my user number to a custom one by parsing a number out of the string,
    or better yet by adding an optional 2nd argument (fn,un).
    un = un || 164109;
    Site security requires the favicon to be hosted on MAM.
    Use: https://www.myanonamouse.net/bitbucket-upload.php
    to store your own custom icons 32x32 or 16x16 if you prefer.
*/
}

// Main Program

// Set up for custom Favicons, and load a simple default.  Link global variable set up once, then used in favi()
if (CICON) { // If changing icons is set to TRUE or 1 etc.
    var link = document.querySelector("link[rel~='icon']");
    if (!link) {
        link = document.createElement('link');
        link.rel = 'icon';
        document.getElementsByTagName('head')[0].appendChild(link);
    }
favi("tm_32x32"); //Simple black mouse w/transparent background
// Source icon: https://www.shareicon.net/data/512x512/2016/01/06/699292_mouse_512x512.png
}

// 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);
if (rnew) rnew = rnew.replace(/[A-z]/g,""); // (v.1.71) to address no space before "This can't be made site FL due to no author set" t/73005 //v1.92 added if, replace doesn't work on 0
//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("After trim 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,"").trim();
if (DEBUG) console.log("rcur= " + rcur ); // For debugging

const vipstat = document.querySelector("#ratio .torDetInnerBottomSpan").textContent;
// VIP status is in the div with class=torDetInnerBottomSpan in another div with id=ratio
if (CICON && (vipstat.search("VIP expires") > -1 || vipstat.search("torrent is freeleech") > -1 ) ) favi("mouseclock");
// TODO parse out when a VIP expires, and add the expiration date to the tab title so it shows up on mouseover!

// Seeding or downloading TRUE if "Actively Seeding" etc.
let seeding = document.getElementById('DLhistory');
if (seeding && CICON) favi("13");
if (seeding && DEBUG) console.log("seeding.textContent= " + seeding.textContent);     //v1.92 object was not useful in console

// 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 ratio loss code if the new ratio exists and we found the current one
if(rnew && rcur && !seeding){ // Need to skip this whole section for correct icon colors, should have in the 1st place
//    let rdiff = 0;
    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); // To see how far the script is progressing as well as the values

    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 "Cost to Restore Ratio"
	rcRow = myaddTorDetailsRow(document.querySelector("div[class='torDetBottom']"), 'Cost to Restore Ratio', 'mp_rcRow');
	if (DEBUG) console.log("rcRow.innerHTML= " + rcRow.innerHTML);

	// Create button that will load data and insert calculations (and slow ajax calls to server)
	//rcRow.innerHTML = '<button id="Mrp_btn">View Calculations</button>';
	//document.getElementById("Mrp_btn").addEventListener("click", fetchUD);

	// Always show calculations when there is a ratio loss
	// 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', 'KiB', 'MiB', 'GiB', 'TiB'];  // V1.9 MAM changed KB to KiB etc. Spring 2022
      // I want to be around when we start sharing TB+ collections! ;-)
			let tsize = x[0].replace(/,/g,"") * Math.pow(1024, sizes.indexOf(x[1])); //Remove commas in V1.9 (only 323984 seemed to need this)
			// 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;
            //let recovU2 = tsize*data.uploaded/data.downloaded; //  yyywwwyyyhhh proposed change
            let recovU = tsize*rcur;
            if (DEBUG) console.log("recovU = " + recovU );
                  rcRow.innerHTML = "<b>" + formatBytes(recovU) + "</b>&nbsp; Uploaded Needed to Restore Current Ratio.<br><b>" +
                  comma(Math.floor(125*recovU/268435456)) + "</b> Bonus Points to purchase. " +
                  "That's enough Bonus Points to obtain approximately <b>one FL wedge per day for " + comma(Math.floor(5*recovU/2147483648)) + "</b> days." ;
                     //"<br>" +   "Contributing 2000 bonus points to each vault gives you on average almost one FL wedge per day.";
            if (DEBUG) { rcRow.innerHTML += "<br>Calculations based on ratio= " + rcur +
            ", approximately " + comma(Math.floor(recovU)) + " future upload bytes, and a download size of " + comma(tsize) + " bytes.";}


  }

    if (CICON && rdiff <= 0.3) favi("DodgerBlue");

    // 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";
        if (CICON) favi("SpringGreen"); //
    }

    // Change this 1 number to your I never want to dl w/o FL ratio loss amount
    if(rdiff > 1){
        dlBtn.style.backgroundColor="Red";
        if (CICON) favi("12");

// Disable link to prevent download
        dlBtn.style.pointerEvents="none";
//	Comment (add // to) the above line to not disable the download button when RED V1.9 new default
        // maybe hide the button, and add the Ratio Loss warning in its place?  Nah!
        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";
        if (CICON) favi("Orange");
    }
}
// if (seeding && CICON) favi("13");  color got changed back in debugging
if (DEBUG) console.log("MAM Ratio Protect BETA 1.94 Completed Normally.");