var ZenWorkspaces = {
  async init() {
    let docElement = document.documentElement;
    if (docElement.getAttribute("chromehidden").includes("toolbar")
      || docElement.getAttribute("chromehidden").includes("menubar")
      || docElement.hasAttribute("privatebrowsingmode")) {
      console.warn("ZenWorkspaces: !!! ZenWorkspaces is disabled in hidden windows !!!");
      return; // We are in a hidden window, don't initialize ZenWorkspaces
    } 
    console.info("ZenWorkspaces: Initializing ZenWorkspaces...");
    window.SessionStore.promiseInitialized.then(async () => {
      await this.initializeWorkspaces();
      console.info("ZenWorkspaces: ZenWorkspaces initialized");
    })
  },

  get workspaceEnabled() {
    return Services.prefs.getBoolPref("zen.workspaces.enabled", false);
  },

  // Wrorkspaces saving/loading
  get _storeFile() {
    return PathUtils.join(
      PathUtils.profileDir,
      "zen-workspaces",
      "Workspaces.json",
    );
  },

  async _workspaces() {
    if (!this._workspaceCache) {
      this._workspaceCache = await IOUtils.readJSON(this._storeFile);
      if (!this._workspaceCache.workspaces) {
        this._workspaceCache.workspaces = [];
      }
    }
    return this._workspaceCache;
  },

  onWorkspacesEnabledChanged() {
    if (this.workspaceEnabled) {
      this.initializeWorkspaces();
    } else {
      this._workspaceCache = null;
      document.getElementById("zen-workspaces-button")?.remove();
      for (let tab of gBrowser.tabs) {
        gBrowser.showTab(tab);
      }
    }
  },

  async initializeWorkspaces() {
    Services.prefs.addObserver("zen.workspaces.enabled", this.onWorkspacesEnabledChanged.bind(this));
    this.initializeWorkspacesButton();
    let file = new FileUtils.File(this._storeFile);
    if (!file.exists()) {
      await IOUtils.writeJSON(this._storeFile, {});
    }
    if (this.workspaceEnabled) {
      window.addEventListener("TabClose", this.handleTabClose.bind(this));
      let workspaces = await this._workspaces();
      if (workspaces.workspaces.length === 0) {
        await this.createAndSaveWorkspace("Default Workspace", true);
      } else {
        let activeWorkspace = workspaces.workspaces.find(workspace => workspace.default);
        if (!activeWorkspace) {
          activeWorkspace = workspaces.workspaces.find(workspace => workspace.used);
          activeWorkspace.used = true;
          await this.saveWorkspaces();
        }
        if (!activeWorkspace) {
          activeWorkspace = workspaces.workspaces[0];
          activeWorkspace.used = true;
          await this.saveWorkspaces();
        }
        this.changeWorkspace(activeWorkspace, true);
      }
      this._initializeWorkspaceCreationIcons();
      this._initializeWorkspaceEditIcons();
      this._initializeWorkspaceTabContextMenus();
    }
  },

  handleTabClose(event) {
    if (this.__contextIsDelete) {
      return; // Bug when closing tabs from the context menu
    }
    let tab = event.target;
    let workspaceID = tab.getAttribute("zen-workspace-id");
    // If the tab is the last one in the workspace, create a new tab
    if (workspaceID) {
      let tabs = gBrowser.tabs.filter(tab => tab.getAttribute("zen-workspace-id") === workspaceID);
      if (tabs.length === 1) {
        this._createNewTabForWorkspace({ uuid: workspaceID });
        // We still need to close other tabs in the workspace
        this.changeWorkspace({ uuid: workspaceID });
      }
    }
  },

  _kIcons: ["🏠", "📄", "💹", "💼", "📧", "✅", "👥"],

  _initializeWorkspaceCreationIcons() {
    let container = document.getElementById("PanelUI-zen-workspaces-create-icons-container");
    for (let icon of this._kIcons) {
      let button = document.createXULElement("toolbarbutton");
      button.className = "toolbarbutton-1";
      button.setAttribute("label", icon);
      button.onclick = ((event) => {
        let wasSelected = button.hasAttribute("selected");
        for (let button of container.children) {
          button.removeAttribute("selected");
        }
        if (!wasSelected) {
          button.setAttribute("selected", "true");
        }
      }).bind(this, button);
      container.appendChild(button);
    }
  },

  _initializeWorkspaceEditIcons() {
    let container = this._workspaceEditIconsContainer;
    for (let icon of this._kIcons) {
      let button = document.createXULElement("toolbarbutton");
      button.className = "toolbarbutton-1";
      button.setAttribute("label", icon);
      button.onclick = ((event) => {
        let wasSelected = button.hasAttribute("selected");
        for (let button of container.children) {
            button.removeAttribute("selected");
        }
        if (!wasSelected) {
          button.setAttribute("selected", "true");
        }
        this.onWorkspaceEditChange();
      }).bind(this, button);
      container.appendChild(button);
    }
  },

  async saveWorkspace(workspaceData) {
    let json = await IOUtils.readJSON(this._storeFile);
    if (typeof json.workspaces === "undefined") {
      json.workspaces = [];
    }
    let existing = json.workspaces.findIndex(workspace => workspace.uuid === workspaceData.uuid);
    if (existing >= 0) {
      json.workspaces[existing] = workspaceData;
    } else {
      json.workspaces.push(workspaceData);
    }
    console.info("ZenWorkspaces: Saving workspace", workspaceData);
    await IOUtils.writeJSON(this._storeFile, json);
    this._workspaceCache = null;
  },

  async removeWorkspace(windowID) {
    let json = await this._workspaces();
    console.info("ZenWorkspaces: Removing workspace", windowID);
    await this.changeWorkspace(json.workspaces.find(workspace => workspace.uuid !== windowID));
    this._deleteAllTabsInWorkspace(windowID);
    json.workspaces = json.workspaces.filter(workspace => workspace.uuid !== windowID);
    await this.unsafeSaveWorkspaces(json);
    await this._propagateWorkspaceData();
  },

  async saveWorkspaces() {
    await IOUtils.writeJSON(this._storeFile, await this._workspaces());
    this._workspaceCache = null;
  },

  async unsafeSaveWorkspaces(workspaces) {
    await IOUtils.writeJSON(this._storeFile, workspaces);
    this._workspaceCache = workspaces;
  },

  // Workspaces dialog UI management

  openSaveDialog() {
    let parentPanel = document.getElementById("PanelUI-zen-workspaces-multiview");
    PanelUI.showSubView("PanelUI-zen-workspaces-create", parentPanel);
  },

  async openEditDialog(workspaceUuid) {
    this._workspaceEditDialog.setAttribute("data-workspace-uuid", workspaceUuid);
    document.getElementById("PanelUI-zen-workspaces-edit-save").setAttribute("disabled", "true");
    let workspaces = (await this._workspaces()).workspaces;
    let workspaceData = workspaces.find(workspace => workspace.uuid === workspaceUuid);
    this._workspaceEditInput.textContent = workspaceData.name;
    this._workspaceEditInput.value = workspaceData.name;
    this._workspaceEditInput.setAttribute("data-initial-value", workspaceData.name);
    this._workspaceEditIconsContainer
      .setAttribute("data-initial-value", workspaceData.icon);
    document.querySelectorAll("#PanelUI-zen-workspaces-edit-icons-container toolbarbutton")
      .forEach(button => {
        if (button.label === workspaceData.icon) {
          button.setAttribute("selected", "true");
        } else {
          button.removeAttribute("selected");
        }
      });
    let parentPanel = document.getElementById("PanelUI-zen-workspaces-multiview");
    PanelUI.showSubView("PanelUI-zen-workspaces-edit", parentPanel);
  },

  closeWorkspacesSubView() {
    let parentPanel = document.getElementById("PanelUI-zen-workspaces-multiview");
    parentPanel.goBack();
  },

  workspaceHasIcon(workspace) {
    return typeof workspace.icon !== "undefined" && workspace.icon !== "";
  },

  getWorkspaceIcon(workspace) {
    if (this.workspaceHasIcon(workspace)) {
      return workspace.icon;
    }
    return workspace.name[0].toUpperCase();
  },

  async _propagateWorkspaceData() {
    let currentContainer = document.getElementById("PanelUI-zen-workspaces-current-info");
    let workspaceList = document.getElementById("PanelUI-zen-workspaces-list");
    const createWorkspaceElement = (workspace) => {
      let element = document.createXULElement("toolbarbutton");
      element.className = "subviewbutton";
      element.setAttribute("tooltiptext", workspace.name);
      element.setAttribute("zen-workspace-id", workspace.uuid);
      //element.setAttribute("context", "zenWorkspaceActionsMenu");
      let childs = window.MozXULElement.parseXULToFragment(`
        <div class="zen-workspace-icon">
        </div>
        <div class="zen-workspace-name">
        </div>
        <toolbarbutton closemenu="none" class="toolbarbutton-1 zen-workspace-actions">
          <image class="toolbarbutton-icon" id="zen-workspace-actions-menu-icon"></image>
        </toolbarbutton>
      `);
      
      // use text content instead of innerHTML to avoid XSS
      childs.querySelector(".zen-workspace-icon").textContent = this.getWorkspaceIcon(workspace);
      childs.querySelector(".zen-workspace-name").textContent = workspace.name;

      childs.querySelector(".zen-workspace-actions").addEventListener("command", (event) => {
        let button = event.target;
        this._contextMenuId = button.closest("toolbarbutton[zen-workspace-id]").getAttribute("zen-workspace-id");
        const popup = button.ownerDocument.getElementById(
          "zenWorkspaceActionsMenu"
        );
        popup.openPopup(button, "after_end");
      });
      element.appendChild(childs);
      element.onclick = (async () => {
        if (event.target.closest(".zen-workspace-actions")) {
          return; // Ignore clicks on the actions button
        }
        await this.changeWorkspace(workspace)
        let panel = document.getElementById("PanelUI-zen-workspaces");
        PanelMultiView.hidePopup(panel);
        document.getElementById("zen-workspaces-button").removeAttribute("open");
      }).bind(this, workspace);
      return element;
    }
    let workspaces = await this._workspaces();
    let activeWorkspace = workspaces.workspaces.find(workspace => workspace.used);
    currentContainer.innerHTML = "";
    workspaceList.innerHTML = "";
    workspaceList.parentNode.style.display = "flex";
    if (workspaces.workspaces.length - 1 <= 0) {
      workspaceList.innerHTML = "No workspaces available";
      workspaceList.setAttribute("empty", "true");
    } else {
      workspaceList.removeAttribute("empty");
    }
    if (activeWorkspace) {
      let currentWorkspace = createWorkspaceElement(activeWorkspace);
      currentContainer.appendChild(currentWorkspace);
    }
    for (let workspace of workspaces.workspaces) {
      if (workspace.used) {
        continue;
      }
      let workspaceElement = createWorkspaceElement(workspace);
      workspaceList.appendChild(workspaceElement);
    }
  },

  async openWorkspacesDialog(event) {
    if (!this.workspaceEnabled) {
      return;
    }
    let target = event.target;
    let panel = document.getElementById("PanelUI-zen-workspaces");
    await this._propagateWorkspaceData();
    PanelMultiView.openPopup(panel, target, {
      position: "bottomright topright",
      triggerEvent: event,
    }).catch(console.error);
  },

  initializeWorkspacesButton() {
    if (!this.workspaceEnabled) {
      return;
    } else if (document.getElementById("zen-workspaces-button")) {
      let button = document.getElementById("zen-workspaces-button");
      button.removeAttribute("hidden");
      return;
    }
    let browserTabs = document.getElementById("tabbrowser-tabs");
    let button = document.createElement("toolbarbutton");
    button.id = "zen-workspaces-button";
    button.className = "toolbarbutton-1 chromeclass-toolbar-additional";
    button.setAttribute("label", "Workspaces");
    button.setAttribute("tooltiptext", "Workspaces");
    button.onclick = this.openWorkspacesDialog.bind(this);
    browserTabs.insertAdjacentElement("beforebegin", button);
  },

  async _updateWorkspacesButton() {
    let button = document.getElementById("zen-workspaces-button");
    if (!button) {
      return;
    }
    let activeWorkspace = (await this._workspaces()).workspaces.find(workspace => workspace.used);
    if (activeWorkspace) {
      button.innerHTML = `
        <div class="zen-workspace-sidebar-icon">
        </div>
        <div class="zen-workspace-sidebar-name">
        </div>
      `;

      // use text content instead of innerHTML to avoid XSS
      button.querySelector(".zen-workspace-sidebar-name").textContent = activeWorkspace.name;
      button.querySelector(".zen-workspace-sidebar-icon").textContent = this.getWorkspaceIcon(activeWorkspace);

      if (!this.workspaceHasIcon(activeWorkspace)) {
        button.querySelector(".zen-workspace-sidebar-icon").setAttribute("no-icon", "true");
      }
    }
  },

  // Workspaces management

  get _workspaceCreateInput() {
    return document.getElementById("PanelUI-zen-workspaces-create-input");
  },

  get _workspaceEditDialog() {
    return document.getElementById("PanelUI-zen-workspaces-edit");
  },

  get _workspaceEditInput() {
    return document.getElementById("PanelUI-zen-workspaces-edit-input");
  },

  get _workspaceEditIconsContainer() {
    return document.getElementById("PanelUI-zen-workspaces-edit-icons-container");
  },

  _deleteAllTabsInWorkspace(workspaceID) {
    for (let tab of gBrowser.tabs) {
      if (tab.getAttribute("zen-workspace-id") === workspaceID) {
        gBrowser.removeTab(tab, {
          animate: true,
          skipSessionStore: true,
          closeWindowWithLastTab: false,
        });
      }
    }
  },

  _prepareNewWorkspace(window) {
    document.documentElement.setAttribute("zen-workspace-id", window.uuid);
    let tabCount = 0;
    for (let tab of gBrowser.tabs) {
      if (!tab.hasAttribute("zen-workspace-id")) {
        tab.setAttribute("zen-workspace-id", window.uuid);
        tabCount++;
      }
    }
    if (tabCount === 0) {
      this._createNewTabForWorkspace(window);
    }
  },

  _createNewTabForWorkspace(window) {
    let tab = gZenUIManager.openAndChangeToTab(Services.prefs.getStringPref("browser.startup.homepage"));
    tab.setAttribute("zen-workspace-id", window.uuid);
  },

  async saveWorkspaceFromCreate() {
    let workspaceName = this._workspaceCreateInput.value;
    if (!workspaceName) {
      return;
    }
    this._workspaceCreateInput.value = "";
    let icon = document.querySelector("#PanelUI-zen-workspaces-create-icons-container [selected]");
    icon?.removeAttribute("selected");
    await this.createAndSaveWorkspace(workspaceName, false, icon?.label);
    document.getElementById("PanelUI-zen-workspaces").hidePopup(true);
  },

  async saveWorkspaceFromEdit() {
    let workspaceUuid = this._workspaceEditDialog.getAttribute("data-workspace-uuid");
    let workspaceName = this._workspaceEditInput.value;
    if (!workspaceName) {
      return;
    }
    this._workspaceEditInput.value = "";
    let icon = document.querySelector("#PanelUI-zen-workspaces-edit-icons-container [selected]");
    icon?.removeAttribute("selected");
    let workspaces = (await this._workspaces()).workspaces;
    let workspaceData = workspaces.find(workspace => workspace.uuid === workspaceUuid);
    workspaceData.name = workspaceName;
    workspaceData.icon = icon?.label;
    await this.saveWorkspace(workspaceData);
    await this._updateWorkspacesButton();
    await this._propagateWorkspaceData();
    this.closeWorkspacesSubView();
  },

  onWorkspaceCreationNameChange(event) {
    let button = document.getElementById("PanelUI-zen-workspaces-create-save");
    if (this._workspaceCreateInput.value === "") {
      button.setAttribute("disabled", "true");
      return;
    }
    button.removeAttribute("disabled");
  },

  onWorkspaceEditChange() {
    let button = document.getElementById("PanelUI-zen-workspaces-edit-save");
    let name = this._workspaceEditInput.value
    let icon = document.querySelector("#PanelUI-zen-workspaces-edit-icons-container [selected]")?.label;
    if ( name === this._workspaceEditInput.getAttribute("data-initial-value")
      && icon === this._workspaceEditIconsContainer.getAttribute("data-initial-value"))
    {
      button.setAttribute("disabled", "true");
      return;
    }
    button.removeAttribute("disabled");
  },

  async changeWorkspace(window, onInit = false) {
    if (!this.workspaceEnabled) {
      return;
    }
    let firstTab = undefined;
    let workspaces = await this._workspaces();
    for (let workspace of workspaces.workspaces) {
      workspace.used = workspace.uuid === window.uuid;
    }
    this.unsafeSaveWorkspaces(workspaces);
    console.info("ZenWorkspaces: Changing workspace to", window.uuid);
    for (let tab of gBrowser.tabs) {
      if ((tab.getAttribute("zen-workspace-id") === window.uuid && !tab.pinned) || !tab.hasAttribute("zen-workspace-id")) {
        if (!firstTab) {
          firstTab = tab;
          gBrowser.selectedTab = firstTab;
        }
        gBrowser.showTab(tab);
        if (!tab.hasAttribute("zen-workspace-id")) {
          // We add the id to those tabs that got inserted before we initialize the workspaces
          // example use case: opening a link from an external app
          tab.setAttribute("zen-workspace-id", window.uuid);
        }
      }
    }
    if (typeof firstTab === "undefined" && !onInit) {
      this._createNewTabForWorkspace(window);
    }
    for (let tab of gBrowser.tabs) {
      if (tab.getAttribute("zen-workspace-id") !== window.uuid) {
        gBrowser.hideTab(tab);
      }
    }
    document.documentElement.setAttribute("zen-workspace-id", window.uuid);
    await this.saveWorkspaces();
    await this._updateWorkspacesButton();
    await this._propagateWorkspaceData();
  },

  _createWorkspaceData(name, isDefault, icon) {
    let window = {
      uuid: gZenUIManager.generateUuidv4(),
      default: isDefault,
      used: true,
      icon: icon,
      name: name,
    };
    this._prepareNewWorkspace(window);
    return window;
  },

  async createAndSaveWorkspace(name = "New Workspace", isDefault = false, icon = undefined) {
    if (!this.workspaceEnabled) {
      return;
    }
    let workspaceData = this._createWorkspaceData(name, isDefault, icon);
    await this.saveWorkspace(workspaceData);
    await this.changeWorkspace(workspaceData);
  },

  async onLocationChange(browser) {
    let tab = gBrowser.getTabForBrowser(browser);
    let workspaceID = tab.getAttribute("zen-workspace-id");
    if (!workspaceID) {
      let workspaces = await this._workspaces();
      let activeWorkspace = workspaces.workspaces.find(workspace => workspace.used);
      if (!activeWorkspace || tab.hasAttribute("hidden")) {
        return;
      }
      tab.setAttribute("zen-workspace-id", activeWorkspace.uuid);
    }
  },

  // Context menu management

  _contextMenuId: null,
  async updateContextMenu(_) {
    console.assert(this._contextMenuId, "No context menu ID set");
    document.querySelector(`#PanelUI-zen-workspaces [zen-workspace-id="${this._contextMenuId}"] .zen-workspace-actions`).setAttribute("active", "true");
    const workspaces = await this._workspaces();
    let deleteMenuItem = document.getElementById("context_zenDeleteWorkspace");
    if (workspaces.workspaces.length <= 1 || workspaces.workspaces.find(workspace => workspace.uuid === this._contextMenuId).default) {
      deleteMenuItem.setAttribute("disabled", "true");
    } else {
      deleteMenuItem.removeAttribute("disabled");
    }
    let defaultMenuItem = document.getElementById("context_zenSetAsDefaultWorkspace");
    if (workspaces.workspaces.find(workspace => workspace.uuid === this._contextMenuId).default) {
      defaultMenuItem.setAttribute("disabled", "true");
    } else {
      defaultMenuItem.removeAttribute("disabled");
    }
    let openMenuItem = document.getElementById("context_zenOpenWorkspace");
    if (workspaces.workspaces.find(workspace => workspace.uuid === this._contextMenuId).used) {
      openMenuItem.setAttribute("disabled", "true");
    } else {
      openMenuItem.removeAttribute("disabled");
    }
  },

  onContextMenuClose() {
    let target = document.querySelector(`#PanelUI-zen-workspaces [zen-workspace-id="${this._contextMenuId}"] .zen-workspace-actions`);
    if (target) {
      target.removeAttribute("active");
    }
    this._contextMenuId = null;
  },

  async setDefaultWorkspace() {
    let workspaces = await this._workspaces();
    for (let workspace of workspaces.workspaces) {
      workspace.default = workspace.uuid === this._contextMenuId;
    }
    await this.unsafeSaveWorkspaces(workspaces);
    await this._propagateWorkspaceData();
  },

  async openWorkspace() {
    let workspaces = await this._workspaces();
    let workspace = workspaces.workspaces.find(workspace => workspace.uuid === this._contextMenuId);
    await this.changeWorkspace(workspace);
  },

  async contextDelete(event) {
    this.__contextIsDelete = true;
    event.stopPropagation();
    await this.removeWorkspace(this._contextMenuId);
    this.__contextIsDelete = false;
  },

  async contextEdit(event) {
    event.stopPropagation();
    await this.openEditDialog(this._contextMenuId);
  },

  async changeWorkspaceShortcut() {
    // Cycle through workspaces
    let workspaces = await this._workspaces();
    let activeWorkspace = workspaces.workspaces.find(workspace => workspace.used);
    let workspaceIndex = workspaces.workspaces.indexOf(activeWorkspace);
    let nextWorkspace = workspaces.workspaces[workspaceIndex + 1] || workspaces.workspaces[0];
    this.changeWorkspace(nextWorkspace);
  },

  _initializeWorkspaceTabContextMenus() {
    const contextMenu = document.getElementById("tabContextMenu");
    const element = window.MozXULElement.parseXULToFragment(`
      <menuseparator/>
      <menu id="context-zen-change-workspace-tab" data-l10n-id="context-zen-change-workspace-tab">
        <menupopup oncommand="ZenWorkspaces.changeTabWorkspace(event.target.getAttribute('zen-workspace-id'))">
        </menupopup>
      </menu>
    `);
    document.getElementById("context_closeDuplicateTabs").after(element);

    contextMenu.addEventListener("popupshowing", async (event) => {
      const menu = document.getElementById("context-zen-change-workspace-tab").querySelector("menupopup");
      menu.innerHTML = "";
      const workspaces = await this._workspaces();
      const activeWorkspace = workspaces.workspaces.find(workspace => workspace.used);
      for (let workspace of workspaces.workspaces) {
        const menuItem = window.MozXULElement.parseXULToFragment(`
          <menuitem label="${gZenUIManager.createValidXULText(workspace.name)}" zen-workspace-id="${workspace.uuid}" />
        `);
        if (workspace.uuid === activeWorkspace.uuid) {
          menuItem.querySelector("menuitem").setAttribute("disabled", "true");
        }
        menu.appendChild(menuItem);
      }
    });
  },

  async changeTabWorkspace(workspaceID) {
    const tabs = TabContextMenu.contextTab.multiselected 
      ? gBrowser.selectedTabs : [TabContextMenu.contextTab];
    for (let tab of tabs) {
      tab.setAttribute("zen-workspace-id", workspaceID);
    }
    const workspaces = await this._workspaces();
    await this.changeWorkspace(workspaces.workspaces.find(workspace => workspace.uuid === workspaceID));
  },
};

ZenWorkspaces.init();