Original post on first page

// ==UserScript==
// @name            Final Display Original Post on First page.  That's all.
// @namespace       bubo-bubo/gmscripts
// @description     ASC - Display Original Post on First page not on every page
// @grant           unsafeWindow
// @run-at          document-end
// @include         https://discussions.apple.com/*
// @include         https://discussionsjapan.apple.com/*
// @include         https://discussionskorea.apple.com/*
// @include         https://discussionschinese.apple.com/*
// @include         https://communities.apple.com/*
// @version         1.0
// ==/UserScript==

// Based on Hiroto's efforts. Moded by rccharles.

var $ = unsafeWindow.jQuery;
var watchdog1, watchdog2;
var watch_interval          = 250; // [ms]
var re_thread_or_message    = new RegExp('^https://[^/]+/(thread|message)/');
var _debug                  = 0;


console.log ("--> " + getDateTime() + ": Only on first page initializing: starting ... ");

// modify thread content view behaviour (in post-load phase)
window.onload = function() {
    // register event listeners
    window.addEventListener('unload', function(e) {
        if (_debug)  console.log('Only on first page unload is observed');
        stop_watchdog_op(watchdog1);
        stop_watchdog_op(watchdog2);
        window.removeEventListener('_locationchange_op',
                                    _locationchange_op_handler,
                                    true);
        window.removeEventListener(e.type, arguments.callee, true);
    }, true);

    window.addEventListener('_locationchange_op', _locationchange_op_handler, true);
    function _locationchange_op_handler(e) {
        if (_debug)  console.log('Only on first page _locationchange is observed');
        var href = window.location.href;
        if ( href.match(re_thread_or_message) ) {
            setTimeout(hide_solved_p2_op, 100);
        }
    }

    // _locationchange watch dog
    var prev_href = '';
    watchdog1 = setInterval( function() {
        // watch for location to change
        var curr_href = window.location.href;
        if (curr_href != prev_href) {
            if (_debug) console.log('Only on first page _locationchange_op is issued');
            window.dispatchEvent(new Event('_locationchange_op'));
            prev_href = curr_href;
        }
    }, watch_interval);
};

// Show or hide targetted element
function hide_solved_p2_op() {

    var u = window.location.href;
    var re = /[?&]start=([0-9]+)/;
    var m = re.exec(u);
    var p = m ? m[1] : 0;
    if (_debug)  console.log('Only on first page current start post numebr = ' + p);

    // Definite hack.
    // Original Poster info
    var div = $('.js-original-header.apple-overflow-hidden');
    if (!div) { return; }
    if (_debug)  console.log('Only on first page   found. decide ');
    p > 0 ? div.hide() : div.show();

    // Original post
    div = $('.j-original-message');
    if (!div) { return; }
    if (_debug)  console.log('Only on first page   decide#3 ');
    p > 0 ? div.hide() : div.show();
}

function stop_watchdog_op(dog) {
    clearInterval(dog);
    // console.log('Only on first page watchdog is inactive : ' + dog);
}

function getDateTime () {
  var currentDate = new Date(),
      day = currentDate.getDate(),
      month = currentDate.getMonth() + 1,
      year = currentDate.getFullYear();

    var currentTime = new Date(),
      hours = currentTime.getHours(),
      minutes = currentTime.getMinutes();

    if (minutes < 10) {
     minutes = "0" + minutes;
  }

    var suffix = "AM";
    if (hours >= 12) {
    suffix = "PM";
    hours = hours - 12;
    }
    if (hours == 0) {
     hours = 12;
    }

    return ( month + "/" + day + "/" + year + "  " + hours + ":" + minutes + " " + suffix);

}  // end of functin getDateTime