asc hiroto pagination tweaks

// ==UserScript==
// @name            ASC thread content view (d2)
// @namespace       bubo-bubo/gmscripts
// @description     ASC - disable jquery animation, initially show all replies, hide rollup solved answer in page 2 or later, clone pagination navigator in header.
// @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         0.2.1
// ==/UserScript==

var _debug = 0;
var $ = unsafeWindow.jQuery;
var watchdog1, watchdog2, watchdog3;
var watch_interval          = 300; // [ms]
var re_thread               = new RegExp('^https://[^/]+/thread/');
var re_thread_or_message    = new RegExp('^https://[^/]+/(thread|message)/');

// disable jquery animation (globally)
$.fx.off = true;

// supplementary styles for pagination nagivator cloned in header (.thread-container-wrapper)
// pagination navigator
document.styleSheets[0].insertRule(
'.thread-container-wrapper .j-pagination.top {\
    position: absolute !important;\
    top: -10px !important;\
    right: 0px !important;\
}', 0);
// loading gear icon
document.styleSheets[0].insertRule(
'.thread-container-wrapper .j-loading-big {\
    position: absolute;\
    top: -6px;\
    left: 0;\
    margin-left: -60px;\
    z-index: -1;\
}', 0);


// modify thread content view behaviour (in post-load phase)
window.onload = function() {
    // register event listeners
    window.addEventListener('unload', function(e) {
        if (_debug) console.log('unload is observed');
        stop_watchdog(watchdog1);
        stop_watchdog(watchdog2);
        stop_watchdog(watchdog3);
        window.removeEventListener('_locationchange', _locationchange_handler, true);
        window.removeEventListener(e.type, arguments.callee, true);
    }, true);

    window.addEventListener('_locationchange', _locationchange_handler, true);
    function _locationchange_handler(e) {
        if (_debug) console.log('_locationchange is observed');
        var href = window.location.href;
        if ( href.match(re_thread) ) {
            setTimeout(show_all_replies, 100);
        }
        if ( href.match(re_thread_or_message) ) {
            setTimeout(hide_solved_p2, 100);
            setTimeout(pagination_in_header, 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('_locationchange is issued');
            window.dispatchEvent(new Event('_locationchange'));
            prev_href = curr_href;
        }
    }, watch_interval);
};

function show_all_replies() {
    window.addEventListener('_helpfuldisplay', function(e) {
        if (_debug) console.log('_helpfuldisplay is observed');
        $('.helpful-all-switch li.helpful').addClass('inactive').removeClass('active').hide();
        $('.helpful-all-switch li.all-replies').addClass('active').removeClass('inactive').show();
        $('#helpful-container').hide();
        $('.all-replies-container').show();
        window.removeEventListener(e.type, arguments.callee, true);
    }, true);

    watchdog2 = setInterval( function() {
        // watch for helpful container to appear
        if (_debug) console.log('watchdog (for helpful container) is active : ' + watchdog2);
        if ($('#helpful-container').css('display') != 'none') {
            if (_debug) console.log('_helpfuldisplay is issued');
            window.dispatchEvent(new Event('_helpfuldisplay'));
            stop_watchdog(watchdog2);
        }
    }, watch_interval);
    setTimeout(stop_watchdog, 3000, watchdog2);
}

function hide_solved_p2() {
    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('current start post numebr = ' + p);
    var div = $('.j-answer-rollup.recommended-answers.span-full-width');
    if (!div) { return; }
    p > 0 ? div.hide() : div.show();
}

function pagination_in_header() {
    window.addEventListener('_pagereday', function(e) {
        if (_debug) console.log('_pagereday is observed');
        var pg = $('.all-replies-container .j-pagination.top');
        if (pg) {
            $('.thread-container-wrapper .j-pagination.top').remove();
            pg.clone(true).appendTo($('.thread-container-wrapper'));
        }
        window.removeEventListener(e.type, arguments.callee, true);
    }, true);

    watchdog3 = setInterval( function() {
        // watch for reply container opacity to be 1 (which is .5 while loading)
        if (_debug) console.log('watchdog (for page ready) is active : ' + watchdog3);
        if ($('.all-replies-container').css('opacity') == 1) {
            if (_debug) console.log('_pagereday is issued');
            window.dispatchEvent(new Event('_pagereday'));
            stop_watchdog(watchdog3);
        }
    }, watch_interval);
//  setTimeout(stop_watchdog, 5000, watchdog3);
}

function stop_watchdog(dog) {
    clearInterval(dog);
    if (_debug) console.log('watchdog is inactive : ' + dog);
}