Speedrun.com Previous Run Display (Tampermonkey Script)

// ==UserScript==
// @name         Speedrun.com Previous Run Display
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Displays a runner's PB (if one exists) on the verify run page
// @author       Dotsarecool
// @match        http://www.speedrun.com/run/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    var url = window.location.href;
    var runId = url.substring(url.indexOf("run/")+4);
    var runObj = callSrcApi("runs/"+runId);

    //var values = runObj.data.values;
    var categoryId = runObj.data.category;
    var gameId = runObj.data.game;
    var playerId = runObj.data.players[0].id;
    var runTime = runObj.data.times.primary_t;

    var playerPBs = callSrcApi("users/"+playerId+"/personal-bests?game="+gameId);
    var matchIdx = -1;
    var i = 0;
    while (i < playerPBs.data.length) {
        if (playerPBs.data[i].run.category === categoryId) {
            matchIdx = i;
            break;
        }
        i++;
    }

    var str = "";
    if (playerPBs.data.length < 1) {
        str = "This is this player's first submitted run of the game.";
    } else if (matchIdx < 0) {
        str = "This is this player's first submitted run of this category.";
    } else {
        var pbPlace = playerPBs.data[matchIdx].place;
        var pbTime = playerPBs.data[matchIdx].run.times.primary_t;

        if (pbTime === runTime) {
            str = "This is the player's personal best.";
        } else if (pbTime < runTime) {
            str = "This run is obsoleted by the player's personal best of " + prettyTime(pbTime) + " (" + prettyPlace(pbPlace) + ") - difference of " + prettyTime(runTime-pbTime) + ".";
        } else {
            str = "Current PB: " + prettyTime(pbTime) + " (" + prettyPlace(pbPlace) + ") - improvement of " + prettyTime(pbTime-runTime) + ".";
        }
    }

    $("#main > .maincontent > .panel > .panel-heading").prepend(str + "<br />");
})();

function callSrcApi(args) {
    var result = {};
    $.ajax({
        url: "http://www.speedrun.com/api/v1/" + args,
        datatype: "json",
        async: false,
        success: function(x) {
            result = x;
        }
    });
    return result;
}

function prettyTime(time) {
    var sec = parseInt(time);
    var h = parseInt(sec/3600);
    var m = parseInt(sec/60) % 60;
    var s = sec % 60;
    var d = parseInt(1000*(time-sec));

    var str = "";
    if (time >= 3600) {
        str = h+"h "+m+"m "+s+"s";
    } else {
        str = m+"m "+s+"s";
    }
    if (d > 0) {
        str += " " + d + "ms";
    }
    return str;
}

function prettyPlace(place) {
    var lastD = place % 10;
    if ((place > 10 && place < 14) || lastD === 0 || lastD > 3) {
        return place+"th place";
    } else if (lastD === 1) {
        return place+"st place";
    } else if (lastD === 2) {
        return place+"nd place";
    } else {
        return place+"rd place";
    }
}