(function () {
  var page = document.querySelector(".attachment-manager-page");
  if (!page) {
    return;
  }

  var conversationSelect = document.getElementById("attachmentConversationSelect");
  var uploadDropzone = document.getElementById("managerUploadDropzone");
  var attachmentInput = document.getElementById("managerAttachmentInput");
  var uploadStatus = document.getElementById("managerUploadStatus");
  var searchInput = document.getElementById("attachmentSearch");
  var table = document.getElementById("attachmentManagerTable");

  function csrfToken() {
    var cookie = document.cookie.split("; ").find(function (item) {
      return item.indexOf("csrftoken=") === 0;
    });
    return cookie ? decodeURIComponent(cookie.split("=")[1]) : "";
  }

  function selectedConversationUrl(id) {
    return id ? "/attachments/?conversation=" + encodeURIComponent(id) : "/attachments/";
  }

  async function patchAttachment(row, payload) {
    var response = await fetch(row.getAttribute("data-update-url"), {
      method: "PATCH",
      headers: {
        "Content-Type": "application/json",
        "X-CSRFToken": csrfToken(),
      },
      body: JSON.stringify(payload),
    });
    if (!response.ok) {
      throw new Error("附件更新失败。");
    }
    return response.json();
  }

  async function deleteAttachment(row) {
    var response = await fetch(row.getAttribute("data-update-url"), {
      method: "DELETE",
      headers: { "X-CSRFToken": csrfToken() },
    });
    if (!response.ok) {
      throw new Error("附件删除失败。");
    }
  }

  async function uploadFiles(files) {
    if (!uploadDropzone || !files || !files.length) {
      return;
    }
    var formData = new FormData();
    Array.prototype.forEach.call(files, function (file) {
      formData.append("files", file);
    });
    if (uploadStatus) {
      uploadStatus.textContent = "上传中...";
    }
    try {
      var response = await fetch(uploadDropzone.getAttribute("data-upload-url"), {
        method: "POST",
        headers: { "X-CSRFToken": csrfToken() },
        body: formData,
      });
      if (!response.ok) {
        throw new Error("上传失败。");
      }
      window.location.reload();
    } catch (error) {
      if (uploadStatus) {
        uploadStatus.textContent = "上传失败，请重试。";
      }
    }
  }

  if (conversationSelect) {
    conversationSelect.addEventListener("change", function () {
      window.location.href = selectedConversationUrl(conversationSelect.value);
    });
  }

  if (uploadDropzone && attachmentInput) {
    uploadDropzone.addEventListener("click", function () {
      attachmentInput.click();
    });
    uploadDropzone.addEventListener("dragover", function (event) {
      event.preventDefault();
      uploadDropzone.classList.add("dragging");
    });
    uploadDropzone.addEventListener("dragleave", function () {
      uploadDropzone.classList.remove("dragging");
    });
    uploadDropzone.addEventListener("drop", function (event) {
      event.preventDefault();
      uploadDropzone.classList.remove("dragging");
      uploadFiles(event.dataTransfer.files);
    });
    attachmentInput.addEventListener("change", function () {
      uploadFiles(attachmentInput.files);
      attachmentInput.value = "";
    });
  }

  if (searchInput && table) {
    searchInput.addEventListener("input", function () {
      var keyword = searchInput.value.trim().toLowerCase();
      table.querySelectorAll("tbody tr[data-attachment-id]").forEach(function (row) {
        var name = (row.querySelector(".attachment-name") || row).textContent.toLowerCase();
        row.hidden = keyword && name.indexOf(keyword) === -1;
      });
    });
  }

  if (table) {
    table.addEventListener("click", async function (event) {
      var actionButton = event.target.closest("[data-attachment-action]");
      if (!actionButton) {
        return;
      }
      var row = actionButton.closest("tr[data-attachment-id]");
      if (!row) {
        return;
      }
      var action = actionButton.getAttribute("data-attachment-action");
      try {
        if (action === "edit") {
          var nameCell = row.querySelector(".attachment-name");
          var nextName = window.prompt("请输入新的附件展示名", nameCell ? nameCell.textContent.trim() : "");
          if (nextName) {
            await patchAttachment(row, { original_name: nextName });
            window.location.reload();
          }
        } else if (action === "toggle") {
          await patchAttachment(row, { is_active: actionButton.textContent.trim() === "启用" });
          window.location.reload();
        } else if (action === "delete" && window.confirm("确认删除该附件？")) {
          await deleteAttachment(row);
          window.location.reload();
        }
      } catch (error) {
        window.alert(error.message || "附件操作失败。");
      }
    });
  }
})();