{
  const ta = document.getElementById("babycode-content");
  
  for (let button of document.querySelectorAll(".reply-button")) {
    button.addEventListener("click", (e) => {
      ta.value += button.value;
      ta.scrollIntoView()
      ta.focus();
    })
  }

  function supportsPopover() {
    return Object.hasOwn(HTMLElement.prototype, "popover");
  }

  if (supportsPopover()){
    let quotedPostContainer = null;
    function isQuoteSelectionValid() {
      const selection = document.getSelection();

      if (!selection || selection.rangeCount === 0 || selection.isCollapsed) {
        return false;
      }

      const range = selection.getRangeAt(0);
      const commonAncestor = range.commonAncestorContainer;

      const ancestorElement = commonAncestor.nodeType === Node.TEXT_NODE
      ? commonAncestor.parentNode
      : commonAncestor;

      const container = ancestorElement.closest(".post-inner");
      if (!container) {
        return false;
      }
      const success = container.contains(ancestorElement);
      if (success) {
        quotedPostContainer = container;
      }
      return success;
    }

    let quotePopover = null;
    let isSelecting = false;

    document.addEventListener("mousedown", () => {
      isSelecting = true;
    })

    document.addEventListener("mouseup", () => {
      isSelecting = false;
      handlePossibleSelection();
    })

    document.addEventListener("keyup", (e) => {
      if (e.shiftKey && (e.key.startsWith('Arrow') || e.key === 'Home' || e.key === 'End')) {
        handlePossibleSelection();
      }
    })

    function handlePossibleSelection() {
      setTimeout(() => {
        const valid = isQuoteSelectionValid();
        if (isSelecting || !valid) {
          removePopover();
          return;
        }

        const selection = document.getSelection();
        const selectionStr = selection.toString().trim();
        if (selection.isCollapsed || selectionStr === "") {
          removePopover();
          return;
        }

        showPopover();
      }, 50)
    }

    function removePopover() {
      quotePopover?.hidePopover();
    }

    function createPopover() {
      quotePopover = document.createElement("div");
      quotePopover.popover = "auto";
      quotePopover.className = "quote-popover";

      const quoteButton = document.createElement("button");
      quoteButton.textContent = "Quote fragment"
      quoteButton.className = "reduced"
      quotePopover.appendChild(quoteButton);

      document.body.appendChild(quotePopover);
      return quoteButton;
    }

    function showPopover() {
      if (!quotePopover) {
        const quoteButton = createPopover();
        quoteButton.addEventListener("click", () => {
          console.log("Quoting:", document.getSelection().toString());
          const postPermalink = quotedPostContainer.dataset.postPermalink;
          const authorUsername = quotedPostContainer.dataset.authorUsername;
          console.log(postPermalink, authorUsername);
          if (ta.value.trim() !== "") {
            ta.value += "\n"
          }
          ta.value += `[url=${postPermalink}]${authorUsername} said:[/url]\n[quote]${document.getSelection().toString()}[/quote]\n`;
          ta.scrollIntoView()
          ta.focus();

          document.getSelection().empty();
          removePopover();
        })
      }

      const range = document.getSelection().getRangeAt(0);
      const rect = range.getBoundingClientRect();
      const scrollY = window.scrollY || window.pageYOffset;

      quotePopover.style.setProperty("top", `${rect.top + scrollY - 55}px`)
      quotePopover.style.setProperty("left", `${rect.left + rect.width/2}px`)

      if (!quotePopover.matches(':popover-open')) {
        quotePopover.showPopover();
      }
    }
  }
  
  const deleteDialog = document.getElementById("delete-dialog");
  const deleteDialogCloseButton = document.getElementById("post-delete-dialog-close");
  let deletionTargetPostContainer;
  
  function closeDeleteDialog() {
    deletionTargetPostContainer.style.removeProperty("background-color");
    deleteDialog.close();
  }
  
  deleteDialogCloseButton.addEventListener("click", (e) => {
    closeDeleteDialog();
  })
  deleteDialog.addEventListener("click", (e) => {
    if (e.target === deleteDialog) {
      closeDeleteDialog();
    }
  })
  for (let button of document.querySelectorAll(".post-delete-button")) {
    button.addEventListener("click", (e) => {
      deleteDialog.showModal();
      const postId = button.value;
      deletionTargetPostContainer = document.getElementById("post-" + postId).querySelector(".post-content-container");
      deletionTargetPostContainer.style.setProperty("background-color", "#fff");
      const form = document.getElementById("post-delete-form");
      form.action = `/post/${postId}/delete`
    })
  }
  
  const threadEndpoint = document.getElementById("thread-subscribe-endpoint").value;
  let now = Math.floor(new Date() / 1000);
  function hideNotification() {
    const notification = document.getElementById('new-post-notification');
    notification.classList.add('hidden');
  }
  
  function showNewPostNotification(url) {
    const notification = document.getElementById("new-post-notification");
    
    notification.classList.remove("hidden");
    
    document.getElementById("dismiss-new-post-button").onclick = () => {
      now = Math.floor(new Date() / 1000);
      hideNotification();
      tryFetchUpdate();
    }
    
    document.getElementById("go-to-new-post-button").href = url;
    
    document.getElementById("unsub-new-post-button").onclick = () => {
      hideNotification();
    }
  }

  function tryFetchUpdate() {
    if (!threadEndpoint) return;
    const body = JSON.stringify({'since': now});
    fetch(threadEndpoint, {method: "POST", headers: {"Content-Type": "application/json"}, body: body})
      .then(res => res.json())
      .then(json => {
        if (json.status === "none") {
          setTimeout(tryFetchUpdate, 5000);
        } else if (json.status === "new_post") {
          showNewPostNotification(json.url);
        }
      })
      .catch(error => console.log(error))
  }
  tryFetchUpdate();
}