Primedice 4 Bet Logger

/*
//  PD4 Bet Logger
//  Created by Serlite
//
//  - Stores successful bets in browser local storage for future reference
//  - Provides utilities to log and clear bets (no UI at the moment, must be called through console)
//      - If you want to save your bets offline, run logSavedBets() in the console, then paste the output into a text file
//        (in supported modern browsers, the output is copied automatically to your clipboard)
*/

var userBetLogKey = "userBetLog";
var currentBetLog;

var retrievedBets = localStorage[userBetLogKey];
if (retrievedBets != null) {
    currentBetLog = JSON.parse(retrievedBets);
}
if (currentBetLog == null){
    currentBetLog = [];
}

(function(open) {
    XMLHttpRequest.prototype.open = function(method, url, async, user, pass) {
        this.addEventListener("readystatechange", function() {
            if (this.readyState == 4 && this.responseURL.indexOf("https://api.primedice.com/api/bet") != -1) {
                var responseObject = JSON.parse(this.response);

                // Ensure bet is not stored duplicate times, in case listener is erroneously attached multiple times by user
                if (currentBetLog.length == 0 || currentBetLog[currentBetLog.length - 1].id != responseObject.bet.id){
                    currentBetLog.push(responseObject.bet);
                    localStorage[userBetLogKey] = JSON.stringify(currentBetLog);
                }
            }
        }, false);

        open.call(this, method, url, async, user, pass);
    };

})(XMLHttpRequest.prototype.open);

function clearSavedBets(){
    currentBetLog = [];
    localStorage[userBetLogKey] = null;
}

function logSavedBets(){
    var loggedBetString = "";
    for (var i = 0; i < currentBetLog.length; i++){
        loggedBetString += formatSavedBet(currentBetLog[i]) + "\n";
    }

    console.log(loggedBetString);
    copy(loggedBetString);
}

function formatSavedBet(bet){
    return "id: " + bet.id
        + " | " + "time: " + new Date(bet.timestamp).toUTCString()
        + " | " + "bet: " + (bet.amount / 100000000).toFixed(8)
        + " | " + "payout: " + bet.multiplier + "x"
        + " | " + "game: " + bet.condition + " " + bet.target.toFixed(2)
        + " | " + "roll: " + bet.roll.toFixed(2)
        + " | " + "profit: " + (bet.profit / 100000000).toFixed(8)
        + " | " + (bet.win ? "WIN" : "LOSS");
}