// Modified from https://github.com/mrhuo/image-viewer
class ImageViewer {
  constructor() {
    this.targetSelector = "#gallery img";
    this.currentScale = 1.0;
    this.maxScale = 8;
    this.minScale = 0.5;
    this.isDragging = false;
    this.hasMoved = false;
    this.downX = 0;
    this.downY = 0;
    this.startX = 0;
    this.startY = 0;
    this.currentX = 0;
    this.currentY = 0;
    this.imageList = [];
    this.fromArtwork = false;
    this.artworkFileIndex = -1;
    this.currentIndex = -1;
    this.oldURI = "";
    this.SettingSubmitting = false;

    this.preview = document.getElementById("preview");
    this.previewView = document.getElementById("preview-view");
    this.sidebar = document.getElementById("sidebar");
    this.imageWrapper = document.getElementById("image-wrapper");
    this.previewImg = document.getElementById("preview-img");
    this.navControls = document.getElementById("nav-controls");
    this.prevBtn = document.getElementById("prev-btn");
    this.nextBtn = document.getElementById("next-btn");
    this.infoBox = document.getElementById("info-box");
    this.imageCaption = document.getElementById("image-caption");
    this.imageIndex = document.getElementById("image-index");
    this.imageInfo = document.getElementById("image-info");
    this.downloadBtn = document.getElementById("download-btn");
    this.deleteBtn = document.getElementById("delete-btn");
    this.sidebarBtn = document.getElementById("sidebar-btn");
    this.sidebarContent = document.getElementById("sidebar-content");

    this.sidebarImageArtworkLink = document.getElementById("img-artwork-a");
    this.sidebarImageAuthor = document.getElementById("img-author");
    this.sidebarImageSource = document.getElementById("img-source");
    this.sidebarImageTag = document.getElementById("img-tag");
    this.sidebarImageInfo = document.getElementById("img-info");
    this.sidebarImageSetting = document.getElementById("img-setting");
    this.sidebarImageSettingSselect = document.getElementById("sensitive-select");
    this.sidebarImageSettingPselect = document.getElementById("private-select");
    this.sidebarImageSettingButton = document.getElementById("setting-button");
    this.sidebarImageSettingPostInput = document.getElementById("post-input");
    this.sidebarImageSettingPostButton = document.getElementById("post-button");
    this.sidebarImageSettingUploadFileButton = document.getElementById("upload-file-button");
    this.sidebarImageSettingUploadURLInput = document.getElementById("upload-url-input");
    this.sidebarImageSettingUploadButton = document.getElementById("upload-button");

    let on = false;
    let status = localStorage.getItem("sidebar_on")
    if (status) {
      if (status === "true" && window.innerWidth > 640) {
        on = true;
      }
    } else if (window.innerWidth > 1600) {
      on = true;
    }

    if (on) this.openSidebar();

    if (document.cookie.includes("_trpic_user")) {
      this.deleteBtn.style.display = "flex";
      this.sidebarImageSetting.style.display = "block";
    }

    this.imageWrapper.addEventListener("wheel", this.handleWheel.bind(this));
    this.imageWrapper.addEventListener("mousedown", this.startDrag.bind(this));
    this.prevBtn.addEventListener("click", this.showPrevImage.bind(this));
    this.nextBtn.addEventListener("click", this.showNextImage.bind(this));
    document.addEventListener("keydown", this.handleKeyDown.bind(this));
    this.downloadBtn.addEventListener("click", this.downloadImage.bind(this));
    this.deleteBtn.addEventListener("click", this.deleteImage.bind(this));
    this.sidebarBtn.addEventListener("click", this.toggleSidebar.bind(this));
    this.sidebarImageSettingSselect.addEventListener("change", this.updateSettingButtonBackground.bind(this));
    this.sidebarImageSettingPselect.addEventListener("change", this.updateSettingButtonBackground.bind(this));
    this.sidebarImageSettingButton.addEventListener("click", this.patchArtwork.bind(this));
    this.sidebarImageSettingPostButton.addEventListener("click", this.postSource.bind(this));
    this.sidebarImageSettingUploadButton.addEventListener("click", this.postArtworkFile.bind(this));
  }

  updateSettingButtonBackground() {
    this.sidebarImageSettingButton.style.backgroundColor = "#99af4c";
  }

  postArtworkFile() {
    const link = this.sidebarImageSettingUploadURLInput.value;
    const files = this.sidebarImageSettingUploadFileButton.files;

    if (link == "" && files.length == 0) {
      alert("请填入链接或文件");
      return;
    }

    this.SettingSubmitting = true;
    this.sidebarImageSettingUploadButton.style.backgroundColor = "rgb(50, 50, 50)";

    let artwork;
    if (this.fromArtwork) {
      artwork = this.imageList[this.currentIndex];
    } else {
      artwork = this.imageList[this.currentIndex].edges.artwork;
    }

    if (link) {
      const formData = new FormData();
      formData.append("link", link);
      fetch(`/api/artworks/${artwork.id}/files`, {
        method: "POST",
        body: formData,
      })
        .then(res => {
          res.json().then(resjson => {
            switch (res.status) {
              case 201:
                break;
              case 401:
                alert("提交失败：需要验证");
                break;
              default:
                alert(`提交失败：${resjson.msg}: ${resjson.error}`);
                break;
            }
          })
        })
        .finally(() => {
          this.sidebarImageSettingUploadButton.style.backgroundColor = "rgb(50, 50, 50)";
          this.sidebarImageSettingUploadURLInput.value = "";
          this.sidebarImageSettingUploadFileButton.value = "";
          this.SettingSubmitting = false;
        })
        .catch(error => {
          alert(`请求失败: ${error}`);
        });
    } else {
      for (const file of files) {
        const formData = new FormData();
        formData.append("file", file);
        fetch(`/api/artworks/${artwork.id}/files`, {
          method: "POST",
          body: formData,
        })
          .then(res => {
            res.json().then(resjson => {
              switch (res.status) {
                case 201:
                  break;
                case 401:
                  alert("提交失败：需要验证");
                  break;
                default:
                  alert(`提交失败：${resjson.msg}: ${resjson.error}`);
                  break;
              }
            })
          })
          .finally(() => {
            this.sidebarImageSettingUploadButton.style.backgroundColor = "rgb(50, 50, 50)";
            this.sidebarImageSettingUploadURLInput.value = "";
            this.sidebarImageSettingUploadFileButton.value = "";
            this.SettingSubmitting = false;
          })
          .catch(error => {
            alert(`请求失败: ${error}`);
          });
      }
    }
  }

  postSource() {
    const link = this.sidebarImageSettingPostInput.value;
    if (link == "" || this.SettingSubmitting == true) return;
    this.SettingSubmitting = true;
    this.sidebarImageSettingPostButton.style.backgroundColor = "rgb(50, 80, 80)";

    let artwork;
    if (this.fromArtwork) {
      artwork = this.imageList[this.currentIndex];
    } else {
      artwork = this.imageList[this.currentIndex].edges.artwork;
    }

    const formData = new FormData();
    formData.append("link", link);

    fetch(`/api/artworks/${artwork.id}/posts`, {
      method: "POST",
      body: formData,
    })
      .then(res => {
        res.json().then(resjson => {
          switch (res.status) {
            case 200:
              artwork.edges.posts = resjson.edges.posts;
              artwork.edges.socials = resjson.edges.socials;
              artwork.edges.tags = resjson.edges.tags;
              this.updateInfoBar();
              break;
            case 401:
              alert("提交失败：需要验证");
              break;
            case 409:
              if (confirm("此来源已链接到另一个作品，前往查看？")) {
                window.location.href = `/artworks/${resjson.artwork_id}`;
              }
              break;
            default:
              alert(`提交失败：${resjson.msg}: ${resjson.error}`);
              break;
          }
        })
      })
      .finally(() => {
        this.sidebarImageSettingPostButton.style.backgroundColor = "rgb(50, 50, 50)";
        this.sidebarImageSettingPostInput.value = "";
        this.SettingSubmitting = false;
      })
      .catch(error => {
        alert(`请求失败: ${error}`);
      });
  }

  patchArtwork() {
    if (this.SettingSubmitting) return;
    this.SettingSubmitting = true;

    let artwork;
    if (this.fromArtwork) {
      artwork = this.imageList[this.currentIndex];
    } else {
      artwork = this.imageList[this.currentIndex].edges.artwork;
    }

    let Svalue = this.sidebarImageSettingSselect.value;
    if (Svalue < 0 || Svalue > 5) {
      this.SettingSubmitting = false;
      return;
    }
    let Pvalue = this.sidebarImageSettingPselect.value;

    const formData = new FormData();
    formData.append("private", Pvalue);
    formData.append("sensitive", Svalue);

    this.sidebarImageSettingButton.style.backgroundColor = "rgb(50, 80, 80)";
    fetch(`/api/artworks/${artwork.id}`, {
      method: "PATCH",
      body: formData,
    })
      .then(res => {
        res.json().then(resjson => {
          switch (res.status) {
            case 200:
              artwork.sensitive = resjson.sensitive ? resjson.sensitive : 0;
              artwork.private = resjson.private ? true : false;
              this.updateInfoBar();
              break;
            case 401:
              alert("提交失败：需要验证");
              break;
            case 409:
              if (confirm("此来源已链接到另一个作品，前往查看？")) {
                window.location.href = `/artworks/${resjson.artwork_id}`;
              }
              break;
            default:
              alert(`提交失败：${resjson.msg}: ${resjson.error}`);
              break;
          }
        })
      })
      .finally(() => {
        this.SettingSubmitting = false;
        setInterval(() => {
          this.sidebarImageSettingButton.style.backgroundColor = "rgb(50, 50, 50)";
        }, 1000)
      })
      .catch(error => {
        alert(`请求失败: ${error}`);
      });
  }

  appendFiles(files) {
    if (files.length === 0) return;
    if (this.fromArtwork) {
      this.imageList = [];
      this.artworkFileIndex = 0;
      this.currentIndex = 0;
    }
    this.imageList.push(...files);
    this.fromArtwork = false;
  }

  appendArtworks(artworks) {
    if (artworks.length === 0) return;
    if (!this.fromArtwork) {
      this.imageList = [];
      this.currentIndex = 0;
    }
    this.imageList.push(...artworks);
    this.fromArtwork = true;
  }

  resetList() {
    this.imageList = [];
    this.currentIndex = 0;
  }

  deleteArtwork() {
    let artwork_id;
    if (this.fromArtwork) {
      artwork_id = this.imageList[this.currentIndex].id;
    } else {
      artwork_id = this.imageList[this.currentIndex].edges.artwork.id;
    }
    fetch(`/api/artworks/${artwork_id}`, {
      method: "DELETE",
    })
      .then((response) => {
        if (response.ok) {
          setTimeout(() => {
            this.closePreview();
            resetGallery();
          }, 1000);
        } else {
          response.json().then((resjson) => {
            alert(`Failed to delete artwork: ${resjson.msg}`);
          });
        }
      })
      .catch((err) => {
        console.error(err);
        alert(`Failed to delete artwork: ${err}`);
      });
  }

  deleteImage() {
    let file;
    if (this.fromArtwork) {
      file = this.imageList[this.currentIndex].edges.files[this.artworkFileIndex];
    } else {
      file = this.imageList[this.currentIndex];
    }
    if (!confirm(`Are you sure you want to delete this ${file.id_str} image?`)) return;
    fetch(`/api/files/${file.id_str}`, {
      method: "DELETE",
    })
      .then((response) => {
        if (response.ok) {
          setTimeout(() => {
            this.closePreview();
            resetGallery();
          }, 1000);
        } else {
          response.json().then((resjson) => {
            if (resjson.code == 403) {
              if (confirm(`This is last image of this artwork, are you want to delete this artwork?`)) this.deleteArtwork();
              return
            }
            alert(`Failed to delete image: ${resjson.msg}`);
          });
        }
      })
      .catch((err) => {
        console.error(err);
        alert(`Failed to delete image: ${err}`);
      });
  }

  downloadImage() {
    let file;
    if (this.fromArtwork) {
      file = this.imageList[this.currentIndex].edges.files[this.artworkFileIndex];
    } else {
      file = this.imageList[this.currentIndex];
    }
    const link = document.createElement("a");
    const filename = `${ file.id_str }.${ file.ext }`
    link.download = `trpic_${filename}`;
    link.href = `/files/${filename}`;
    link.click();
    link.remove();
  }

  openSidebar() {
    localStorage.setItem("sidebar_on", true);
    this.sidebar.style.width = "30vw";
    this.sidebar.classList.add("open");
    this.navControls.classList.add("min-hide");
    this.sidebarBtn.style.backgroundColor = "rgba(105, 105, 105, 0.3)";
  }

  closeSidebar() {
    localStorage.setItem("sidebar_on", false);
    this.sidebar.style.width = "0px";
    this.sidebar.classList.remove("open");
    this.navControls.classList.remove("min-hide");
    this.sidebarBtn.style.backgroundColor = "";
  }

  toggleSidebar() {
    if (this.sidebar.classList.contains("open")) {
      this.closeSidebar();
    } else {
      this.openSidebar();
    }
  }

  bindDragEvents() {
    this.imageWrapper.addEventListener("mousemove", this.doDrag.bind(this));
    this.imageWrapper.addEventListener("mouseup", this.endDrag.bind(this));
    this.imageWrapper.addEventListener("mouseleave", this.endDrag.bind(this));
  }

  unbindDragEvents() {
    this.imageWrapper.removeEventListener("mousemove", this.doDrag.bind(this));
    this.imageWrapper.removeEventListener("mouseup", this.endDrag.bind(this));
    this.imageWrapper.removeEventListener("mouseleave",this.endDrag.bind(this));
  }

  resetTransform() {
    this.currentScale = 1.0;
    this.currentX = 0;
    this.currentY = 0;
    this.updateImageTransform();
  }

  updateImageTransform() {
    this.previewImg.style.transform = `
      translate(${this.currentX}px, ${this.currentY}px)
      scale(${this.currentScale})
    `;
  }

  showImageByIndex(index, prev) {
    if (index < 0 || index >= this.imageList.length) {
      return;
    }

    if (index === this.imageList.length - 7 && index > prev) {
      loadMore();
    }

    this.currentIndex = index;
    let file;
    if (this.fromArtwork) {
      file = this.imageList[this.currentIndex].edges.files[this.artworkFileIndex];
    } else {
      file = this.imageList[this.currentIndex];
    }
    this.resetTransform();
    const highResSrc = `/files/${file.id_str}.${file.ext}`;
    const lowResSrc = `/thumbnails/${file.id_str}.jpg`;

    this.previewImg.src = (file.thumbed && !file.highres_loaded) ? lowResSrc : highResSrc;
    this.updateInfoBar();
    this.updateNavButtons();

    this.previewImg.onload = () => {
      // 如果有高分辨率图片，异步加载并在完成后替换
      if (file.thumbed) {
        this.loadHighResImage(file, highResSrc);
      }
    };

    this.previewImg.onerror = () => {
      this.updateInfoBar("Failed to load image");
    };

    this.infoBox.style.opacity = 0;
    this.preview.style.display = "flex";
    document.body.style.overflow = "hidden";
    gallery.style.opacity = 0.3;
  }

  loadHighResImage(file, highResSrc) {
    this.imageIndex.textContent += "　loading...";

    const listIndex = this.currentIndex;
    const fileIndex = this.artworkFileIndex;
    const highResImg = new Image();

    highResImg.onload = () => {
      this.previewImg.onload = null;

      // Check if the image index has changed
      if (this.currentIndex != listIndex || this.artworkFileIndex != fileIndex) return;

      // High-resolution image loaded, replace current image
      this.previewImg.src = highResSrc;
      file.highres_loaded = "true";

      this.updateInfoBar();
    };

    highResImg.onerror = (err) => {
      if (this.currentIndex != listIndex || this.artworkFileIndex != fileIndex) return;
      this.updateInfoBar();
      alert(`Failed to load high res image: ${err}`)
    };

    highResImg.src = highResSrc;
  }

  updateInfoBar() {
    if (this.fromArtwork) {
      this.updateInfoBarArtwork();
    } else {
      this.updateInfoBarFile();
    }
  }

  updateInfoBarArtwork() {
    const artwork = this.imageList[this.currentIndex];
    this.imageIndex.textContent = `${this.currentIndex + 1}${artwork.edges.files.length > 1 ? ` - ${this.artworkFileIndex + 1}` : ""} / ${this.imageList.length}`;

    this.sidebarImageAuthor.replaceChildren();
    if (artwork.edges.socials) {
      artwork.edges.socials.forEach((social, index) => {
        const author = document.createElement("p");
        if (index > 0) {
          author.style.borderTop = "1px solid #777";
        }
        const authorLink = document.createElement("a");
        authorLink.textContent = `${social.platform}/${social.display_name}`;
        authorLink.href = social.url;
        authorLink.target = "_blank";
        author.appendChild(authorLink);
        this.sidebarImageAuthor.appendChild(author);
      })
    }

    this.sidebarImageSource.replaceChildren();
    if (artwork.edges.posts) {
      artwork.edges.posts.forEach((post, index) => {
        const source = document.createElement("div");
        if (index > 0) {
          source.style.borderTop = "1px solid #777";
        }
        const link = document.createElement("a");
        link.textContent = `${post.platform}/${post.post_id}`;
        link.href = post.url;
        link.target = "_blank";
        source.appendChild(link);

        if (post.time) {
          const time = document.createElement("p");
          time.classList.add("time");
          time.textContent = post.time.substring(0, 19);
          source.appendChild(time);
        }

        if (post.title) {
          const title = document.createElement("p");
          title.classList.add("title");
          title.textContent = post.title;
          source.appendChild(title);
        }

        if (post.text) {
          const text = document.createElement("p");
          text.classList.add("desc");
          text.textContent = post.text;
          // text.innerHTML = post.text;
          source.appendChild(text);
        }

        this.sidebarImageSource.appendChild(source);
      })
    }

    this.sidebarImageTag.replaceChildren();
    if (artwork.edges.tags) {
      artwork.edges.tags.forEach(tag => {
        const tagLink = document.createElement("a");
        tagLink.textContent = `#${tag.text}`;
        tagLink.href = `/artworks/?tags=${tag.id}`;
        this.sidebarImageTag.appendChild(tagLink);
      })
    }

    const file = artwork.edges.files[this.artworkFileIndex];
    const fileRes = document.createElement("p");
    fileRes.textContent = `${file.width}*${file.height}px`;
    const fileInfo = document.createElement("p");
    fileInfo.textContent = `${file.size_str} · ${file.ext}`;
    const id = document.createElement("p");
    id.id = "img-id";
    id.textContent = `${file.id_str} L${artwork.sensitive ? artwork.sensitive : 0} ${artwork.private ? " (private)" : ""}`;
    this.sidebarImageInfo.replaceChildren(fileRes, fileInfo, id);
    if (document.cookie.includes("_trpic_user")) {
      const a = document.createElement("a");
      a.href = `/convert/${file.id_str}`;
      a.target = "_blank";
      a.textContent = `${file.quality ? `${file.quality}% ` : ""}Convert`;
      this.sidebarImageInfo.appendChild(a);
    }

    this.sidebarImageSettingSselect.value = artwork.sensitive ? artwork.sensitive : 0;
    this.sidebarImageSettingPselect.value = Boolean(artwork.private);
    this.sidebarImageSettingPselect.style.backgroundColor = artwork.private ? "rgb(80, 70, 50)" : "rgb(50, 80, 50)";

    this.sidebarImageArtworkLink.textContent = this.sidebarImageArtworkLink.href = `/artworks/${artwork.id}`;
    history.replaceState(null, null, `/artworks/${artwork.id}${this.artworkFileIndex > 0 ? `/photo/${this.artworkFileIndex}` : ""}`);
  }

  updateInfoBarFile() {
    const file = this.imageList[this.currentIndex];
    const artwork = file.edges.artwork
    this.imageIndex.textContent = `${this.currentIndex + 1} / ${this.imageList.length}`;

    this.sidebarImageAuthor.replaceChildren();
    if (artwork.edges.socials) {
      artwork.edges.socials.forEach((social, index) => {
        const author = document.createElement("p");
        if (index > 0) {
          author.style.borderTop = "1px solid #777";
        }
        const authorLink = document.createElement("a");
        authorLink.textContent = `${social.platform}/${social.display_name}`;
        authorLink.href = social.url;
        authorLink.target = "_blank";
        author.appendChild(authorLink);
        this.sidebarImageAuthor.appendChild(author);
      })
    }

    this.sidebarImageSource.replaceChildren();
    if (artwork.edges.posts) {
      artwork.edges.posts.forEach((post, index) => {
        const source = document.createElement("div");
        if (index > 0) {
          source.style.borderTop = "1px solid #777";
        }
        const link = document.createElement("a");
        link.textContent = `${post.platform}/${post.post_id}`;
        link.href = post.url;
        link.target = "_blank";
        source.appendChild(link);

        if (post.time) {
          const time = document.createElement("p");
          time.classList.add("time");
          time.textContent = post.time.substring(0, 19);
          source.appendChild(time);
        }

        if (post.title) {
          const title = document.createElement("p");
          title.textContent = post.title;
          source.appendChild(title);
        }

        if (post.text) {
          const text = document.createElement("p");
          text.classList.add("desc");
          text.textContent = post.text;
          // text.innerHTML = post.text;
          source.appendChild(text);
        }

        this.sidebarImageSource.appendChild(source);
      })
    }

    this.sidebarImageTag.replaceChildren();
    if (artwork.edges.tags) {
      artwork.edges.tags.forEach(tag => {
        const tagLink = document.createElement("a");
        tagLink.textContent = `#${tag.text}`;
        tagLink.href = `/artworks/?tags=${tag.id}`;
        this.sidebarImageTag.appendChild(tagLink);
      })
    }

    const fileRes = document.createElement("p");
    fileRes.textContent = `${file.width}*${file.height}px`;
    const fileInfo = document.createElement("p");
    fileInfo.textContent = `${file.size_str} · ${file.ext}`;

    const id = document.createElement("p");
    id.id = "img-id";
    id.textContent = `${file.id_str} L${artwork.sensitive ? artwork.sensitive : 0 } ${artwork.private ? " (private)" : ""}`;
    this.sidebarImageInfo.replaceChildren(fileRes, fileInfo, id);
    if (document.cookie.includes("_trpic_user")) {
      const a = document.createElement("a");
      a.href = `/convert/${file.id_str}`;
      a.target = "_blank";
      a.textContent = `${file.quality ? `${file.quality}% ` : ""}Convert`;
      this.sidebarImageInfo.appendChild(a);
    }

    this.sidebarImageSettingSselect.value = artwork.sensitive ? artwork.sensitive : 0;
    this.sidebarImageSettingPselect.value = Boolean(artwork.private);
    this.sidebarImageSettingPselect.style.backgroundColor = artwork.private ? "rgb(80, 70, 50)" : "rgb(50, 80, 50)";

    this.sidebarImageArtworkLink.textContent = this.sidebarImageArtworkLink.href = `/artworks/${artwork.id}`;
    history.replaceState(null, null, `/artworks/${artwork.id}`);
  }

  updateNavButtons() {
    let hasPrev = false;
    let hasNext = false;

    if (this.fromArtwork) {
      hasPrev = this.artworkFileIndex > 0 || this.currentIndex > 0;
      hasNext = this.artworkFileIndex < this.imageList[this.currentIndex].edges.files.length - 1 || this.currentIndex < this.imageList.length - 1;
    } else {
      hasPrev = this.currentIndex > 0;
      hasNext = this.currentIndex < this.imageList.length - 1;
    }

    this.prevBtn.style.opacity = hasPrev ? "1" : "0";
    this.prevBtn.style.pointerEvents = hasPrev ? "auto" : "none";

    this.nextBtn.style.opacity = hasNext ? "1" : "0";
    this.nextBtn.style.pointerEvents = hasNext ? "auto" : "none";
  }

  openPreview(e, img) {
    if (img.tagName != "IMG") return;
    e.stopPropagation();
    let index;
    if (this.fromArtwork) {
      index = this.imageList.findIndex((i) => i.id == img.dataset.artwork_id);
      this.artworkFileIndex = this.imageList[index].edges.files.findIndex((i) => i.id_str == img.dataset.id_str);
    } else {
      index = this.imageList.findIndex((i) => i.id_str === img.dataset.id_str);
    }
    if (index !== -1) {
      this.oldURI = window.location.pathname + window.location.search;
      if (window.innerWidth <= 640) this.closeSidebar();
      this.showImageByIndex(index, 0);
    }
  }

  closePreview() {
    this.currentIndex = -1;
    this.infoBox.style.opacity = 1;
    this.preview.style.display = "none";
    document.body.style.overflow = "";
    gallery.style.opacity = 1;
    history.replaceState(null, null, this.oldURI);
  }

  showNextImage() {
    if (this.fromArtwork) {
      if (this.artworkFileIndex < this.imageList[this.currentIndex].edges.files.length - 1) {
        this.artworkFileIndex++;
        this.showImageByIndex(this.currentIndex, this.currentIndex);
        return;
      }
      if (this.currentIndex < this.imageList.length - 1) {
        this.artworkFileIndex = 0;
        this.showImageByIndex(this.currentIndex + 1, this.currentIndex);
      }
    } else {
      if (this.currentIndex < this.imageList.length - 1) {
        this.showImageByIndex(this.currentIndex + 1, this.currentIndex);
      }
    }
  }

  showPrevImage() {
    if (this.fromArtwork) {
      if (this.artworkFileIndex > 0) {
        this.artworkFileIndex--;
        this.showImageByIndex(this.currentIndex, this.currentIndex);
        return;
      }
      if (this.currentIndex > 0) {
        this.artworkFileIndex = this.imageList[this.currentIndex - 1].edges.files.length - 1;
        this.showImageByIndex(this.currentIndex - 1, this.currentIndex);
      }
    } else {
      if (this.currentIndex > 0) {
        this.showImageByIndex(this.currentIndex - 1, this.currentIndex);
      }
    }
  }

  handleKeyDown(e) {
    if (e.key == "Enter") {
      this.openPreview(e, document.activeElement);
      return;
    }
    if (this.preview.style.display !== "flex") return;
    if (document.activeElement === this.sidebarImageSettingPostInput || document.activeElement === this.sidebarImageSettingUploadURLInput) return;

    switch (e.key) {
      case "Escape":
        this.closePreview();
        break;
      case "ArrowRight":
        this.showNextImage();
        break;
      case "ArrowLeft":
        this.showPrevImage();
        break;
      case "b":
        if (e.ctrlKey) {
          this.toggleSidebar();
        }
        break;
    }
  }

  handleWheel(e) {
    e.preventDefault();
    const delta = e.deltaY > 0 ? this.currentScale < 2 ? -0.1 : -0.2 : this.currentScale < 2 ? 0.1 : 0.2;
    const newScale = parseFloat((this.currentScale + delta).toFixed(10));

    if (newScale >= this.minScale && newScale <= this.maxScale) {
      const ratio = newScale / this.currentScale;
      const rect = this.imageWrapper.getBoundingClientRect();

      const offsetX = e.clientX - (rect.left + rect.width / 2);
      const offsetY = e.clientY - (rect.top + rect.height / 2);

      this.currentX = offsetX * (1 - ratio) + this.currentX * ratio;
      this.currentY = offsetY * (1 - ratio) + this.currentY * ratio;
      this.currentScale = newScale;
      this.updateImageTransform();
    }
  }

  startDrag(e) {
    if (e.button !== 0) return; // Only left button
    e.preventDefault();
    e.stopPropagation();

    this.isDragging = true;
    this.hasMoved = false;
    this.startX = e.clientX - this.currentX;
    this.startY = e.clientY - this.currentY;
    this.downX = e.clientX;
    this.downY = e.clientY;
    this.imageWrapper.classList.add("dragging");
    this.bindDragEvents();
  }

  doDrag(e) {
    if (!this.isDragging) return;
    e.preventDefault();
    e.stopPropagation();
    const dx = e.clientX - this.downX;
    const dy = e.clientY - this.downY;
    if (Math.abs(dx) > 2 || Math.abs(dy) > 2) {
      this.hasMoved = true;
    }
    this.currentX = e.clientX - this.startX;
    this.currentY = e.clientY - this.startY;
    this.updateImageTransform();
  }

  endDrag(e) {
    if (!this.isDragging) return;
    if (e) {
      e.stopPropagation();
    }

    this.isDragging = false;
    this.imageWrapper.classList.remove("dragging");
    this.unbindDragEvents();

    if (!this.hasMoved) {
      this.closePreview();
    }
  }

  bindClickEvents(img) {
    img.addEventListener("click", (e) => this.openPreview(e, img));
    img.style.cursor = "zoom-in";
  }
}

let imgviewer;

document.addEventListener('DOMContentLoaded', () => {
  imgviewer = new ImageViewer({})
});