// ==UserScript==
// @name        nicovideo - pause watch history
// @name:ja     視聴履歴に残さない(一時停止)
// @namespace   https://greasyfork.org/users/19523
// @description このユーザスクリプトを有効にしている間はニコニコ動画内で動画を再生してもその動画が視聴履歴に残りません(たぶん)
// @include     http://www.nicovideo.jp/watch/*
// @include     https://www.nicovideo.jp/watch/*
// @version     0.2.3
// @grant       none
// @downloadURL none
// ==/UserScript==


function deleteFromHistory() {
  var xhr = new XMLHttpRequest();
  xhr.open('GET', '/my/history', true);
  xhr.send();

  xhr.addEventListener('load', function () {
    var token = xhr.response.match(/VideoViewHistory\.Action\('(.+?)'/)[1];
    var videoId = location.pathname.match(/[^/]+$/)[0];
    var post = new XMLHttpRequest();
    if (!token) {
      isSent = true;
      return;
    }
    post.open('POST', '/my/history', true);
    post.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    post.setRequestHeader('Accept', 'application/json, text/javascript, *; q=0.01');
    post.setRequestHeader('x-requested-with', 'XMLHttpRequest');
    post.withCredentials = true;
    post.responseType = 'json';
    post.send('mode=delete&video_id=' + videoId + '&token=' + token + '&innerPage=1');
    post.addEventListener('load', function () {
      isSent = true;
    });
  });

  xhr.addEventListener('error', function () {
    isSent = true;
  });
}

var isSent = false;
var delay = 15000;

(function () {
  if (document.getElementById('external_nicoplayer')) {
    setTimeout(deleteFromHistory, delay);
  } else {
    deleteFromHistory();
  }
})();

window.addEventListener('beforeunload', function (e) {

  if (isSent) {
    return;
  }

  setTimeout(function () {
    alert('視聴履歴から削除中...');
  }, 0);
  deleteFromHistory();

  e.returnValue = '視聴履歴から削除中';
  // e.preventDefault();

}/*, { passive: false }*/);