// ==UserScript==
// @name           Autopagerize for haiku
// @namespace      http://rails2u.com/
// @include        http://h.hatena.ne.jp/*
// @include        http://h.hatena.com/*
//
// patched by Constellation
// repatched by kurumigi
//
// ==/UserScript==

var THRESHOLD = 800;

var w = typeof(unsafeWindow) == 'undefined'? window : unsafeWindow;
var p = w.Hatena.Haiku.Pager;
var Ten = w.Ten;

var enable    = true;
var appending = false;
var lastMaxScrollY = 0;
var now = function() {
  return Number(new Date);
};

var pageURL = location.href;

p.addEventListener('loadedEntries', function(div) {
  // calculate next page URL
  pageURL = function() {
    if (/\?page=\d+$/.exec(pageURL)) {
      return pageURL.replace(/(\?page=)(\d+)$/, function(d0, d1, d2) {
        // ?page=2 -> ?page=3
        return d1 + (Number(d2) + 1);
      });
    } else {
      return pageURL += '?page=2';
    }
  }();
  
  // apply document filters
  appending = false;
  dfilters.forEach(function(f){ f(div, pageURL, {}) });
  
  // dispatch 'AutoPagerize_DOMNodeInserted' event
  var ev1 = document.createEvent('MutationEvent');
  ev1.initMutationEvent('AutoPagerize_DOMNodeInserted', true, false, div.parentNode, null, pageURL, null, null);
  div.dispatchEvent(ev1);
  
  // apply filters
  var page = [div];
  filters.forEach(function(f){ f(page) });
  
  // dispatch 'GM_AutoPagerizeNextPageLoaded' event
  var ev2 = document.createEvent('Event');
  ev2.initEvent('GM_AutoPagerizeNextPageLoaded', true, false);
  document.dispatchEvent(ev2);
});

w.addEventListener('scroll', function(ev) {
  if (!enable) return;

  if (!appending) {
    if (((w.scrollMaxY || Math.max(document.documentElement.scrollHeight, document.body.scrollHeight)) - w.scrollY) < THRESHOLD) {
      lastMaxScrollY = w.scrollMaxY;
      appending = true;
      var anchor = Ten.Selector.getElementsBySelector('div.pager:first-child > a:first-child')[0];
      var mEv = e = w.document.createEvent('MouseEvents');
      mEv.initEvent('click',true,true);
      anchor.dispatchEvent(mEv);
    }
  }
}, false);

w.addEventListener('dblclick', function(ev) {
    enable = !enable;
}, false);

document.addEventListener('AutoPagerizeToggleRequest', function(ev) {
    enable = !enable;
}, false)

// AutoPagerize API
var filters = [];
var dfilters = [];
if(typeof(window.AutoPagerize) == 'undefined'){
  window.AutoPagerize = {}
  window.AutoPagerize.addFilter = function(f) {
      filters.push(f)
  }
  window.AutoPagerize.addDocumentFilter = function(f) {
      dfilters.push(f)
  }
  var ev = document.createEvent('Events')
  ev.initEvent('GM_AutoPagerizeLoaded', false, true)
  window.dispatchEvent(ev)
}