var daysFromLastVisit = 7; // Change this and only this to modify the cutoff date.
var cutoffDate = new Date(); // Gets current date
var AmericanDateFormat=true; //Set to true for American Date Format (Month/Day/Year), false for (Day/Month/Year)
cutoffDate.setHours(0,0,0,0); // setting the current date to a plain date, without the hour and such. This could cause problems otherwise.
cutoffDate.setDate(cutoffDate.getDate() - daysFromLastVisit); // Specs say this should work everywhere. In doubt, use Chrome or Firefox.

var usernamesArray = document.getElementsByClassName('nobold'); // This will probably break with any site updates.

// Output strings
var hasVisited = '';
var hasntVisited = '';

if (usernamesArray.length == 0){
    console.log("NO USERS DETECTED, THE SITE HAD A LAYOUT UPDATE"); // Adding a warning, just in case
}else{
    for(var i=0; i < usernamesArray.length; i++){
        var username = usernamesArray[i].innerHTML; // Grabs username
        var AMURICAdateText = usernamesArray[i].parentNode.parentNode.lastChild.innerHTML.trim(); // Does some DOM magic to get the date. This will probably break when the site updates.
        var hasVisitedRecently = false; // This is set to true only if the user has visited, after all that code.


        if(AMURICAdateText != ''){ // If the user has visited the board at least once. I don't feel particularly confident when checking against an empty string, this is very prone to breaking but it works for the current version of the admin page.
            // Start code to fix the date to a standard format because AMURICA
            var splitDate = AMURICAdateText.split('/'); // splits '11/18/14' into ['11', '18', '14']
            if(AmericanDateFormat){
            var outputDate = splitDate[0]+'/'+splitDate[1]+'/20'+splitDate[2]; // Switches month and day around. Will break when 2100 comes.
            }else{
                var outputDate = splitDate[1]+'/'+splitDate[0]+'/20'+splitDate[2]; // Switches month and day around. Will break when 2100 comes.
            }
            // End AMURICA code

            // This has to be done manually as I don't trust at all that different browsers will parse a non ISO date correctly.
            var lastVisitDateObject = new Date();
            lastVisitDateObject.setHours(0,0,0,0); // Plain date, no hours.
            lastVisitDateObject.setFullYear('20'+splitDate[2]);
            lastVisitDateObject.setMonth(splitDate[0] - 1); // WHY THE **** MONTH IS 0-11 WHEN DAY IS 1-31
            lastVisitDateObject.setDate(splitDate[1]);

            if(lastVisitDateObject.toString() == 'NaN'){ // Just doing some housekeeping, this should never happen but if GF screws up you'll be warned
                var lastVisitDate = "ERROR";
            }else{
                if(cutoffDate <= lastVisitDateObject){
                    hasVisitedRecently = true; // Whew. Done.
                };
            };
        }else{
            var outputDate = "Hasn't visited the board";
        };

        if(hasVisitedRecently){
            hasVisited += (username + ' @ ' + outputDate + "\n");
        }else{
            hasntVisited += (username + ' @ ' + outputDate + "\n");
        };
    };

    // The following generates a textarea and fills it with the output.
    var textareaVisited = document.createElement('textarea');
    textareaVisited.style.width = '49%';
    textareaVisited.style.height = '300px';
    textareaVisited.innerHTML = "Users who visited in the last "+daysFromLastVisit+" days:\n" + hasVisited;
    var textareaNotVisited = document.createElement('textarea');
    textareaNotVisited.style.width = '49%';
    textareaNotVisited.style.height = '300px';
    textareaNotVisited.innerHTML = "Users who did NOT visit in the last "+daysFromLastVisit+" days:\n" + hasntVisited;
    // The following adds it to the page.
    var userTable = document.getElementsByClassName('board')[0];
    var parentDiv = userTable.parentNode;
    parentDiv.insertBefore(textareaVisited, userTable);
    parentDiv.insertBefore(textareaNotVisited, userTable);
};