// ==UserScript==
// @name         键盘翻页
// @name:en      Keyboard Page Up/Down
// @description  使用键盘按键(PgUp: ← D P Ctrl+Shift+Space; PgDn: → F N Ctrl+Space) 点击页面上的上一页/下一页。脚本也支持其他网站，但需要用户修改此脚本，将上下页按键的选择器添加到脚本指定位置。
// @description:en    Use key (PgUp: ← D P Ctrl+Shift+Space; PgDn: → F N Ctrl+Space) to click the privious or next button on the page. You can modify this script to support other pages.
// @namespace    https://greasyfork.org/zh-CN/scripts/419483
// @version      0.2.1
// @author       oajsdfk
// @match        https://adnmb3.com/*
// @match        https://yande.re/*
// @grant        none
// @downloadURL none
// ==/UserScript==

(function() {
  'use strict';

  window.addEventListener('keyup', function(e){
    let s;
    switch(e.keyCode){
      case 32: // Space
        if(e.ctrlKey && !e.metaKey) s = e.shiftKey ? 1 : 2;
        else return;
        break;
      case 37: // ←
      case 68: // D
      case 80: // P
      case 33: // PgUp
        s = 1;
        break;
      case 39: // →
      case 70: // F
      case 78: // N
      case 34: // PgDn
        s = 2;
        break;
      default: return;
    }

    let ae = document.activeElement;
    const it = ['input', 'select', 'button', 'textarea'];
    if (ae && it.indexOf(ae.tagName.toLowerCase()) !== -1) return;

    const m = {
      "https://adnmb[0-9]?\.com/.*": {"btn": ['#h-content > div.uk-container > ul > li:nth-child(1) > a', '#h-content > div.uk-container > ul > li:nth-last-child(2) > a'], "ignore": "textarea, input, select, button"},
      "https://yande\.re/post/popular.*": {"btn": ['#post-popular > h3 > a:nth-child(1)', '#post-popular > h3 > a:nth-child(2)'], "ignore_id": ["tags"]},
      "https://yande\.re/.*": {"btn":['a.previous_page', 'a.next_page'], "ignore_id": ["tags"]},

      ///  可选项： 取消下面的注释，并把 match 行移动到顶部
      ///  Option: uncomment those lines and move the match line to the top
      //
      // @match        https://konachan.com/*
      // @match        https://*.iwara.tv/*
      // @match        https://*.javlibrary.com/*
      // @match        https://*.javbus.one/*
      // @match        https://*.javbus.com/*
      // @match        https://*.reimu.net/*
      //"https://konachan.com/.*": {"btn": ['a.previous_page', 'a.next_page']},
      //"https://.*\.iwara\.tv/.*": {"btn": ['.pager-previous > a', '.pager-next > a']},
      //"https://(.*\.)?javlibrary\.com/.*": {"btn": ['a.page.prev', 'a.page.next']},
      //"https://(.*\.)?javbus[0-9]*\.[^/]*/.*": {"btn": ['#pre', '#next']},
      //"https://(.*\.)?reimu\.net/.*": {"btn2": ['span.current']},
    };

    let u = window.location.href;
    let k = Object.keys(m).find(k => u.match(k));
    if (!k) return;
    let t = m[k];

    //if (ae && t.ignore_id && t.ignore_id.find(i => ae === document.getElementById(i))) return;
    //if (ae && t.ignore && [...document.querySelectorAll(t.ignore)].find(i => i.contains(ae))) return;

    if (t.btn2) {
      let c = document.querySelector(t.btn2[0]);
      if (c) {
        let a = (s===1) ? c.previousElementSibling : c.nextElementSibling;
        if (t.btn2.length === 3) a = a.querySelector(t.btn2[s]);
        if (a) a.click();
      }
      return;
    }

    let a = document.querySelector(t.btn[s-1]);
    if (a) a.click();
  });
})();