// ==UserScript==
// @name         Baozi Manga Read Helpr
// @name:zh-CN   包子漫画阅读辅助
// @name:zh-TW   包子漫畫閱讀輔助
// @version      2.2.2
// @description  read infinite scroll,manga link open in newtab,preload next page images
// @description:zh-CN  包子漫画阅读辅助,瀑布流阅读连续载入图片，在新分页打开漫画链接(自用)。
// @description:zh-TW  包子漫畫閱讀輔助,瀑布流閱讀連續載入圖片，在新分頁打開漫畫鏈接(自用)。
// @author       tony0809
// @match        *://cn.baozimh.com/*
// @match        *://cn.webmota.com/*
// @match        *://tw.baozimh.com/*
// @match        *://tw.webmota.com/*
// @match        *://www.baozimh.com/*
// @match        *://www.webmota.com/*
// @match        *://cn.kukuc.co/*
// @match        *://tw.kukuc.co/*
// @match        *://www.kukuc.co/*
// @icon         https://www.baozimh.com/favicon.ico
// @grant        none
// @run-at       document-end
// @license GPL
// @namespace https://greasyfork.org/users/20361
// @downloadURL none
// ==/UserScript==

(() => {
    'use strict';
    const options = { //true 開啟，false 關閉
        oint: true, //在新分頁打開漫畫鏈接。
        aH: true, //載入下一話時添加瀏覽器歷史紀錄
        aO: true, //目錄頁自動展開全部章節。
        pln: true, //預讀下一頁的圖片，減少等待加載圖片渲染頁面的時間。
        remove: [true, 4] //!!!不能小於2!!!閱讀載入超過n話時刪除前面話數的圖片。
    },
          ge = e => document.querySelector(e),
          gae = e => document.querySelectorAll(e),
          gx = x => document.evaluate(x, document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue,
          lh = location.host,
          lp = location.pathname,
          classify = /^\/classify/.test(lp),
          list = /^\/list\/new/.test(lp),
          search = /^\/search\?/.test(lp),
          comic = /^\/comic\/[^.]+$/.test(lp),
          read = /^\/comic\/chapter\/[^.]+\.html$/.test(lp),
          addGlobalStyle = css => {
              let style = document.createElement('style');
              style.type = 'text/css';
              style.innerHTML = css;
              document.head.appendChild(style);
          },
          readCss = `
.goback {
    background: #fff url(data:image/png;base64,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) no-repeat;
    background-position:bottom 6px right 5px;
    opacity: 0.7;
    border-radius: 50%;
    position: fixed;
    z-index:999;
    bottom: 7px;
    left: 50%;
    margin-left: -16px;
    width: 36px;
    height: 36px;
}
.mobadsq {
    display: none !important
}
ul {
    margin-block-start: -2px !important;
    margin-block-end: 2px !important
}
.chapterLoading {
    font-size: 20px;
    height: 80px;
    line-height: 32px;
    text-align: center;
}
.chapterTitle {
    width: auto;
    height: 30px;
    font-size: 20px;
    font-family: Arial,sans-serif!important;
    line-height: 32px;
    text-align: center;
    margin: 10px 5px;
    border: 1px solid #e0e0e0;
    background-color: #f0f0f0;
    background: -webkit-gradient(linear, 0 0, 0 100%, from(#f9f9f9), to(#f0f0f0));
    background: -moz-linear-gradient(top, #f9f9f9, #f0f0f0);
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.6);
    border-radius: 5px;
}
.next_chapter + .l-content {
    display: none;
}
          `,
          openInNewTab = () => gae('.comics-card a:not([target=_blank]),.bookshelf-items a:not(.remove-img):not([target=_blank])').forEach(a => {
              a.setAttribute('target', '_blank');
          }),
          addGoBack = () => {
              let goback = document.createElement('div');
              goback.className = 'goback';
              goback.setAttribute('title', '返回頂部');
              goback.addEventListener('click', () => {
                  window.scrollTo({
                      top: 0,
                      behavior: "smooth"
                  });
              });
              document.body.appendChild(goback);
          },
          removeAd = () => {
              let loop = setInterval(() => {
                  let ad = ge('#interstitial_fade');
                  if (ad) {
                      clearInterval(loop);
                      ad.remove();
                  }
              }, 100);
              setTimeout(() => {
                  if (loop) clearInterval(loop);
              }, 1e4);
              gae('.mobadsq').forEach(e => {
                  e.remove();
              });
          },
          addHistory = (title, url) => {
              history.pushState(null, title, url);
              document.title = title;
          },
          showElement = () => {
              let end = gx("//div[@class='next_chapter']/span[text()='这是本作品最后一话了' or text()='這是本作品最後一話了']");
              if (end) {
                  ge('.next_chapter+.l-content').style.display = 'block';
                  const observer = new IntersectionObserver((entries, observer) => {
                      entries.forEach(entry => {
                          if (entry.isIntersecting) {
                              observer.unobserve(entry.target);
                              let e = entry.target;
                              setTimeout(()=>{
                                  let noImg = e.querySelector('div.i-amphtml-svc');
                                  if (noImg) {
                                      noImg.remove();
                                      let img = new Image();
                                      img.setAttribute('decoding','async');
                                      img.setAttribute('alt', e.getAttribute('alt'));
                                      img.src = e.getAttribute('src');
                                      img.className = 'i-amphtml-svc i-amphtml-loading-container i-amphtml-fill-content';
                                      e.appendChild(img);
                                  }
                              },200);
                          }
                      });
                  });
                  gae('.l-box a>amp-img').forEach(amp => {
                      observer.observe(amp);
                  });
              }
          },
          addLoad = () => {
              let cl = document.createElement('div');
              cl.className = 'chapterLoading';
              let li = new Image();
              li.className = 'loadingImg';
              li.src = '/_nuxt/img/loading.12fdcc4.gif';
              li.style.width = '50px';
              cl.appendChild(li);
              let lt = document.createElement('div');
              lt.className = 'loadingText';
              lt.innerText = 'Loading...';
              cl.appendChild(lt);
              ge('.comic-contain').appendChild(cl);
          },
          removeLoad = () => {
              ge('.chapterLoading').remove();
          },
          addTitle = title => {
              let t = document.createElement('div');
              t.className = 'chapterTitle';
              t.innerText = title;
              let load = ge('.chapterLoading');
              load.parentNode.insertBefore(t, load);
          },
          parseHTML = str => {
              let doc;
              try {
                  doc = new DOMParser().parseFromString(str, 'text/html');
              } catch (e) {}
              if (!doc) {
                  doc = document.implementation.createHTMLDocument('');
                  doc.documentElement.innerHTML = str;
              }
              return doc;
          },
          preloadNext = () => {
              let next = ge('#next-chapter');
              if (next) {
                  let url = next.href;
                  const nh = next.host;
                  if (nh !== lh) {
                      url = url.replace(nh, lh);
                  }
                  fetch(url).then(res => res.text()).then(res => {
                      let doc = parseHTML(res),
                          imgs = doc.querySelectorAll('.comic-contain amp-img');
                      imgs.forEach(e => {
                          let img = new Image();
                          img.src = e.getAttribute('src');
                      });
                  });
              }
          },
          fetchData = url => {
              fetch(url).then(res => res.text()).then(res => {
                  let doc = parseHTML(res);
                  insertData(doc, url);
                  setTimeout(() => {
                      addNextObserver();
                  }, 1300);
              }).catch(error => {
                  console.error(error);
                  ge('.loadingImg').style.display = 'none';
                  ge('.loadingText').innerText = '連線出錯，請返回頂部重新載入。';
              });
          },
          nextObserver = new IntersectionObserver((entries, observer) => {
              entries.forEach(entry => {
                  if (entry.isIntersecting) {
                      observer.unobserve(entry.target);
                      let next = ge('#next-chapter');
                      if (next) {
                          console.log('觸發載入下一頁');
                          //可能會遇到當前域名和下一頁鏈接的域名不同，導致發生跨域請求出錯的情況，需替換為當前域名。
                          let url = next.href;
                          const nh = next.host;
                          if (nh !== lh) {
                              url = url.replace(nh, lh);
                          }
                          addLoad();
                          fetchData(url);
                      }
                  }
              });
          }),
          insertData = (d, url) => {
              let imgs = d.querySelectorAll('.comic-contain amp-img'),
                  F = new DocumentFragment();
              imgs.forEach(e => {
                  let img = new Image();
                  img.className = 'comic-contain__item';
                  img.src = e.getAttribute('src');
                  F.appendChild(img);
              });
              let load = ge('.chapterLoading');
              if (load) {
                  const rge = e => d.querySelector(e);
                  ['.comic-chapter>.next_chapter', '.bottom-bar', 'span.title'].forEach(e => {
                      ge(e).outerHTML = rge(e).outerHTML; //替換元素
                  });
                  showElement();
                  let title = rge('span.title').innerText;
                  if (!/\/\d+_\d+_\d+\.html$/.test(url)) { //是下一話才添加標題分隔條，下一頁則不添加。
                      let docTitle = d.title;
                      if (options.aH) {
                          addHistory(docTitle, url);
                      }
                      addTitle(title);
                  }
                  if (options.remove[0] && options.remove[1] > 1) {
                      removeOldChapter();
                  }
                  setTimeout(() => {
                      load.parentNode.insertBefore(F, load);
                      removeLoad();
                      if (options.pln) {
                          preloadNext();
                      }
                  }, 300);
              } else {
                  showElement();
                  let E = ge('.comic-contain');
                  E.innerHTML = '';
                  E.appendChild(F);
              }
          },
          addNextObserver = () => {
              let lastImg = [...ge('.comic-contain').querySelectorAll('img')].pop(), //用最後一張圖片作為觀察對象。
                  loadImg = new Image();
              loadImg.src = lastImg.src;
              loadImg.onload = () => {
                  //等待最後一張圖片載入完成再添加觀察元素，過早會連續觸發下一頁，導致圖片請求過度頻繁。
                  nextObserver.observe(lastImg);
              };
              loadImg.onerror = () => {
                  alert('可能圖片請求過於頻繁，觸發網站限制圖片403拒絕存取，也或許只是圖片404掛掉了，請自行確認。');
                  //圖片出錯則改用當前頁面的next元素做為觀察對象
                  let elem = ge('.comic-chapter>.next_chapter');
                  nextObserver.observe(elem);
              };
          },
          removeOldChapter = () => {
              let titles = gae('.chapterTitle');
              if (titles.length > options.remove[1]) {
                  titles[0].remove();
                  let removes = gae('.comic-contain>*');
                  for (let i in removes) {
                      if (/chapterTitle/.test(removes[i].className)) {
                          break;
                      }
                      removes[i].remove();
                  }
              }
          };

    if (read) {
        removeAd();
        addGoBack();
        addGlobalStyle(readCss);
        insertData(document);
        addNextObserver();
        if (options.pln) {
            setTimeout(()=>{
                preloadNext();
            },3000);
        }
    }

    if (options.oint && !comic && !read) {
        openInNewTab();
        new MutationObserver(() => {
            openInNewTab();
        }).observe(document.body, {
            childList: true,
            subtree: true
        });
    }

    if (options.aO && comic) {
        window.onload = () => {
            let open = ge('#button_show_all_chatper:not([hidden])');
            if (open) open.click();
        };
    }

})();