import hoistedNoteService from "../services/hoisted_note.js";
import treeService from "../services/tree.js";
import utils from "../services/utils.js";
import contextMenu from "../menus/context_menu.js";
import froca from "../services/froca.js";
import branchService from "../services/branches.js";
import ws from "../services/ws.js";
import NoteContextAwareWidget from "./note_context_aware_widget.js";
import server from "../services/server.js";
import noteCreateService from "../services/note_create.js";
import toastService from "../services/toast.js";
import appContext from "../components/app_context.js";
import keyboardActionsService from "../services/keyboard_actions.js";
import clipboard from "../services/clipboard.js";
import protectedSessionService from "../services/protected_session.js";
import linkService from "../services/link.js";
import syncService from "../services/sync.js";
import options from "../services/options.js";
import protectedSessionHolder from "../services/protected_session_holder.js";
import dialogService from "../services/dialog.js";
import shortcutService from "../services/shortcuts.js";
import LauncherContextMenu from "../menus/launcher_context_menu.js";

const TPL = `
<div class="tree-wrapper">
    <style>
    .tree-wrapper {
        flex-grow: 1;
        flex-shrink: 1;
        flex-basis: 60%;
        font-family: var(--tree-font-family);
        font-size: var(--tree-font-size);
        position: relative;
        min-height: 0;
    }
    
    .tree {
        height: 100%;
        overflow: auto;
        padding-bottom: 35px;
        padding-top: 5px;
    }
    
    .tree-actions {
        padding: 4px 0;
        background-color: var(--launcher-pane-background-color);
        z-index: 100;
        position: absolute;
        bottom: 0;
        display: flex;
        align-items: flex-end;
        justify-content: flex-end;
        right: 11.77px;
    }
    
    button.tree-floating-button {
        font-size: 1.5em;
        padding: 5px;
        margin-right: 5px;
        max-height: 34px;
        color: var(--launcher-pane-text-color);
        background-color: var(--button-background-color);
        border-radius: var(--button-border-radius);
        border: 1px solid transparent;
    }
    
    button.tree-floating-button:hover {
        border: 1px solid var(--button-border-color);
    }
    
    .collapse-tree-button {
        right: 100px;
    }
    
    .scroll-to-active-note-button {
        right: 55px;
    }
    
    .tree-settings-button {
        right: 10px;
    }
    
    .tree-settings-popup {
        display: none; 
        position: absolute; 
        background-color: var(--accented-background-color); 
        border: 1px solid var(--main-border-color); 
        padding: 20px; 
        z-index: 1000;
        width: 340px; 
        border-radius: 10px;
    }
    
    .tree .hidden-node-is-hidden {
        display: none;
    }
    </style>
    
    <div class="tree"></div>
    
    <div class="tree-actions">
        <button class="tree-floating-button bx bx-layer-minus collapse-tree-button" 
                title="Collapse note tree" 
                data-trigger-command="collapseTree"></button>
        
        <button class="tree-floating-button bx bx-crosshair scroll-to-active-note-button" 
                title="Scroll to active note" 
                data-trigger-command="scrollToActiveNote"></button>
        
        <button class="tree-floating-button bx bx-cog tree-settings-button" 
                title="Tree settings"></button>
    </div>
    
    
    <div class="tree-settings-popup">
        <div class="form-check">
            <label class="form-check-label">
                <input class="form-check-input hide-archived-notes" type="checkbox" value="">
            
                Hide archived notes
            </label>
        </div>
        <div class="form-check">
            <label class="form-check-label">
                <input class="form-check-input hide-included-images" type="checkbox" value="">
                
                Hide images included in a note
                <span class="bx bx-info-circle" 
                      title="Images which are shown in the parent text note will not be displayed in the tree"></span>
            </label>
        </div>
        <div class="form-check">
            <label class="form-check-label">
                <input class="form-check-input auto-collapse-note-tree" type="checkbox" value="">
                
                Automatically collapse notes
                <span class="bx bx-info-circle" 
                      title="Notes will be collapsed after period of inactivity to declutter the tree."></span>
            </label>
        </div>
    
        <br/>
    
        <button class="btn btn-sm btn-primary save-tree-settings-button" type="submit">Save & apply changes</button>
    </div>
</div>
`;

const MAX_SEARCH_RESULTS_IN_TREE = 100;

export default class NoteTreeWidget extends NoteContextAwareWidget {
    constructor() {
        super();

        this.treeName = "main"; // legacy value
    }

    doRender() {
        this.$widget = $(TPL);
        this.$tree = this.$widget.find('.tree');
        this.$treeActions = this.$widget.find(".tree-actions");

        this.$tree.on("mousedown", ".unhoist-button", () => hoistedNoteService.unhoist());
        this.$tree.on("mousedown", ".refresh-search-button", e => this.refreshSearch(e));
        this.$tree.on("mousedown", ".add-note-button", e => {
            const node = $.ui.fancytree.getNode(e);
            const parentNotePath = treeService.getNotePath(node);

            noteCreateService.createNote(parentNotePath, {
                isProtected: node.data.isProtected
            });
        });

        this.$tree.on("mousedown", ".enter-workspace-button", e => {
            const node = $.ui.fancytree.getNode(e);

            this.triggerCommand('hoistNote', {noteId: node.data.noteId});
        });

        // fancytree doesn't support middle click so this is a way to support it
        this.$tree.on('mousedown', '.fancytree-title', e => {
            if (e.which === 2) {
                const node = $.ui.fancytree.getNode(e);

                const notePath = treeService.getNotePath(node);

                if (notePath) {
                    appContext.tabManager.openTabWithNoteWithHoisting(notePath);
                }

                e.stopPropagation();
                e.preventDefault();
            }
        });

        this.$treeSettingsPopup = this.$widget.find('.tree-settings-popup');
        this.$hideArchivedNotesCheckbox = this.$treeSettingsPopup.find('.hide-archived-notes');
        this.$hideIncludedImages = this.$treeSettingsPopup.find('.hide-included-images');
        this.$autoCollapseNoteTree = this.$treeSettingsPopup.find('.auto-collapse-note-tree');

        this.$treeSettingsButton = this.$widget.find('.tree-settings-button');
        this.$treeSettingsButton.on("click", e => {
            if (this.$treeSettingsPopup.is(":visible")) {
                this.$treeSettingsPopup.hide();
                return;
            }

            this.$hideArchivedNotesCheckbox.prop("checked", this.hideArchivedNotes);
            this.$hideIncludedImages.prop("checked", this.hideIncludedImages);
            this.$autoCollapseNoteTree.prop("checked", this.autoCollapseNoteTree);

            const top = this.$treeActions[0].offsetTop - (this.$treeSettingsPopup.outerHeight());
            const left = Math.max(
                0,
                this.$treeActions[0].offsetLeft - this.$treeSettingsPopup.outerWidth() + this.$treeActions.outerWidth()
            );

            this.$treeSettingsPopup.css({
                top,
                left
            }).show();

            return false;
        });

        this.$treeSettingsPopup.on("click", e => { e.stopPropagation(); });

        $(document).on('click', () => this.$treeSettingsPopup.hide());

        this.$saveTreeSettingsButton = this.$treeSettingsPopup.find('.save-tree-settings-button');
        this.$saveTreeSettingsButton.on('click', async () => {
            await this.setHideArchivedNotes(this.$hideArchivedNotesCheckbox.prop("checked"));
            await this.setHideIncludedImages(this.$hideIncludedImages.prop("checked"));
            await this.setAutoCollapseNoteTree(this.$autoCollapseNoteTree.prop("checked"));

            this.$treeSettingsPopup.hide();

            this.reloadTreeFromCache();
        });

        // note tree starts initializing already during render which is atypical
        Promise.all([options.initializedPromise, froca.initializedPromise]).then(() => this.initFancyTree());

        this.setupNoteTitleTooltip();
    }

    setupNoteTitleTooltip() {
        // the following will dynamically set tree item's tooltip if the whole item's text is not currently visible
        // if the whole text is visible then no tooltip is show since that's unnecessarily distracting
        // see https://github.com/zadam/trilium/pull/1120 for discussion

        // code inspired by https://gist.github.com/jtsternberg/c272d7de5b967cec2d3d
        const isEnclosing = ($container, $sub) => {
            const conOffset           = $container.offset();
            const conDistanceFromTop  = conOffset.top + $container.outerHeight(true);
            const conDistanceFromLeft = conOffset.left + $container.outerWidth(true);

            const subOffset           = $sub.offset();
            const subDistanceFromTop  = subOffset.top + $sub.outerHeight(true);
            const subDistanceFromLeft = subOffset.left + $sub.outerWidth(true);

            return conDistanceFromTop > subDistanceFromTop
                && conOffset.top < subOffset.top
                && conDistanceFromLeft > subDistanceFromLeft
                && conOffset.left < subOffset.left;
        };

        this.$tree.on("mouseenter", "span.fancytree-title", e => {
            e.currentTarget.title = isEnclosing(this.$tree, $(e.currentTarget))
                ? ""
                : e.currentTarget.innerText;
        });
    }

    get hideArchivedNotes() {
        return options.is(`hideArchivedNotes_${this.treeName}`);
    }

    async setHideArchivedNotes(val) {
        await options.save(`hideArchivedNotes_${this.treeName}`, val.toString());
    }

    get hideIncludedImages() {
        return options.is(`hideIncludedImages_${this.treeName}`);
    }

    async setHideIncludedImages(val) {
        await options.save(`hideIncludedImages_${this.treeName}`, val.toString());
    }

    get autoCollapseNoteTree() {
        return options.is("autoCollapseNoteTree");
    }

    async setAutoCollapseNoteTree(val) {
        await options.save("autoCollapseNoteTree", val.toString());
    }

    initFancyTree() {
        const treeData = [this.prepareRootNode()];

        this.$tree.fancytree({
            titlesTabbable: true,
            keyboard: true,
            extensions: ["dnd5", "clones", "filter"],
            source: treeData,
            scrollOfs: {
                top: 100,
                bottom: 100
            },
            scrollParent: this.$tree,
            minExpandLevel: 2, // root can't be collapsed
            click: (event, data) => {
                this.activityDetected();

                const targetType = data.targetType;
                const node = data.node;

                if (node.isSelected() && targetType === 'icon') {
                    this.triggerCommand('openBulkActionsDialog', {
                        selectedOrActiveNoteIds: this.getSelectedOrActiveNoteIds(node)
                    });

                    return false;
                }
                else if (targetType === 'title' || targetType === 'icon') {
                    if (event.shiftKey) {
                        const activeNode = this.getActiveNode();

                        if (activeNode.getParent() !== node.getParent()) {
                            return;
                        }

                        this.clearSelectedNodes();

                        function selectInBetween(first, second) {
                            for (let i = 0; first && first !== second && i < 10000; i++) {
                                first.setSelected(true);
                                first = first.getNextSibling();
                            }

                            second.setSelected();
                        }

                        if (activeNode.getIndex() < node.getIndex()) {
                            selectInBetween(activeNode, node);
                        } else {
                            selectInBetween(node, activeNode);
                        }

                        node.setFocus(true);
                    }
                    else if ((!utils.isMac() && event.ctrlKey) || (utils.isMac() && event.metaKey)) {
                        const notePath = treeService.getNotePath(node);
                        appContext.tabManager.openTabWithNoteWithHoisting(notePath);
                    }
                    else if (event.altKey) {
                        node.setSelected(!node.isSelected());
                        node.setFocus(true);
                    }
                    else if (data.node.isActive()) {
                        // this is important for single column mobile view, otherwise it's not possible to see again previously displayed note
                        this.tree.reactivate(true);
                    }
                    else {
                        node.setActive();
                    }

                    return false;
                }
            },
            beforeActivate: (event, {node}) => {
                // hidden subtree is hidden hackily, prevent activating it e.g. by keyboard

                if (hoistedNoteService.getHoistedNoteId() === '_hidden') {
                    // if we're hoisted in hidden subtree, we want to avoid crossing to "visible" tree,
                    // which could happen via UP key from hidden root

                    return node.data.noteId !== 'root';
                }

                // we're not hoisted to hidden subtree, the only way to cross is via DOWN key to the hidden root
                return node.data.noteId !== '_hidden';
            },
            activate: async (event, data) => {
                // click event won't propagate so let's close context menu manually
                contextMenu.hide();

                this.clearSelectedNodes();

                const notePath = treeService.getNotePath(data.node);

                const activeNoteContext = appContext.tabManager.getActiveContext();
                await activeNoteContext.setNote(notePath);
            },
            expand: (event, data) => this.setExpanded(data.node.data.branchId, true),
            collapse: (event, data) => this.setExpanded(data.node.data.branchId, false),
            filter: {
                counter: false,
                mode: "hide",
                autoExpand: true
            },
            dnd5: {
                autoExpandMS: 600,
                preventLazyParents: false,
                dragStart: (node, data) => {
                    if (['root', '_hidden', '_lbRoot', '_lbAvailableLaunchers', '_lbVisibleLaunchers'].includes(node.data.noteId)
                        || node.data.noteId.startsWith("_options")) {
                        return false;
                    }

                    const notes = this.getSelectedOrActiveNodes(node).map(node => ({
                        noteId: node.data.noteId,
                        branchId: node.data.branchId,
                        title: node.title
                    }));

                    if (notes.length === 1) {
                        linkService.createNoteLink(notes[0].noteId, {referenceLink: true})
                            .then($link => data.dataTransfer.setData("text/html", $link[0].outerHTML));
                    }
                    else {
                        Promise.all(notes.map(note => linkService.createNoteLink(note.noteId, {referenceLink: true}))).then(links => {
                            const $list = $("<ul>").append(...links.map($link => $("<li>").append($link)));

                            data.dataTransfer.setData("text/html", $list[0].outerHTML);
                        });
                    }

                    data.dataTransfer.setData("text", JSON.stringify(notes));
                    return true; // allow dragging to start
                },
                dragEnter: (node, data) => {
                    if (node.data.noteType === 'search') {
                        return false;
                    } else if (node.data.noteId === '_lbRoot') {
                        return false;
                    } else if (node.data.noteId.startsWith('_options')) {
                        return false;
                    } else if (node.data.noteType === 'launcher') {
                        return ['before', 'after'];
                    } else if (['_lbAvailableLaunchers', '_lbVisibleLaunchers'].includes(node.data.noteId)) {
                        return ['over'];
                    } else {
                        return true;
                    }
                },
                dragDrop: async (node, data) => {
                    if ((data.hitMode === 'over' && node.data.noteType === 'search') ||
                        (['after', 'before'].includes(data.hitMode)
                            && (node.data.noteId === hoistedNoteService.getHoistedNoteId() || node.getParent().data.noteType === 'search'))) {

                        await dialogService.info("Dropping notes into this location is not allowed.");

                        return;
                    }

                    const dataTransfer = data.dataTransfer;

                    if (dataTransfer && dataTransfer.files && dataTransfer.files.length > 0) {
                        const files = [...dataTransfer.files]; // chrome has issue that dataTransfer.files empties after async operation

                        const importService = await import('../services/import');

                        importService.uploadFiles(node.data.noteId, files, {
                            safeImport: true,
                            shrinkImages: true,
                            textImportedAsText: true,
                            codeImportedAsCode: true,
                            explodeArchives: true,
                            replaceUnderscoresWithSpaces: true
                        });
                    }
                    else {
                        const jsonStr = dataTransfer.getData("text");
                        let notes = null;

                        try {
                            notes = JSON.parse(jsonStr);
                        }
                        catch (e) {
                            logError(`Cannot parse JSON '${jsonStr}' into notes for drop`);
                            return;
                        }

                        // This function MUST be defined to enable dropping of items on the tree.
                        // data.hitMode is 'before', 'after', or 'over'.

                        const selectedBranchIds = notes.map(note => note.branchId);

                        if (data.hitMode === "before") {
                            branchService.moveBeforeBranch(selectedBranchIds, node.data.branchId);
                        } else if (data.hitMode === "after") {
                            branchService.moveAfterBranch(selectedBranchIds, node.data.branchId);
                        } else if (data.hitMode === "over") {
                            branchService.moveToParentNote(selectedBranchIds, node.data.branchId);
                        } else {
                            throw new Error(`Unknown hitMode=${data.hitMode}`);
                        }
                    }
                }
            },
            lazyLoad: (event, data) => {
                const {noteId, noteType} = data.node.data;

                if (noteType === 'search') {
                    const notePath = treeService.getNotePath(data.node.getParent());

                    // this is a search cycle (search note is a descendant of its own search result)
                    if (notePath.includes(noteId)) {
                        data.result = [];
                        return;
                    }

                    data.result = froca.loadSearchNote(noteId).then(() => {
                        const note = froca.getNoteFromCache(noteId);

                        let childNoteIds = note.getChildNoteIds();

                        if (note.type === 'search' && childNoteIds.length > MAX_SEARCH_RESULTS_IN_TREE) {
                            childNoteIds = childNoteIds.slice(0, MAX_SEARCH_RESULTS_IN_TREE);
                        }

                        return froca.getNotes(childNoteIds);
                    }).then(() => {
                        const note = froca.getNoteFromCache(noteId);

                        return this.prepareChildren(note);
                    });
                }
                else {
                    data.result = froca.loadSubTree(noteId).then(note => this.prepareChildren(note));
                }
            },
            clones: {
                highlightActiveClones: true
            },
            enhanceTitle: async function (event, data) {
                const node = data.node;

                if (!node.data.noteId) {
                    // if there's "non-note" node, then don't enhance
                    // this can happen for e.g. "Load error!" node
                    return;
                }

                const note = await froca.getNote(node.data.noteId, true);

                if (!note || note.isDeleted) {
                    return;
                }

                const activeNoteContext = appContext.tabManager.getActiveContext();

                const $span = $(node.span);

                $span.find('.tree-item-button').remove();

                const isHoistedNote = activeNoteContext && activeNoteContext.hoistedNoteId === note.noteId && note.noteId !== 'root';

                if (isHoistedNote) {
                    const $unhoistButton = $('<span class="tree-item-button unhoist-button bx bx-door-open" title="Unhoist"></span>');

                    // unhoist button is prepended since compared to other buttons this is not just convenience
                    // on the mobile interface - it's the only way to unhoist
                    $span.prepend($unhoistButton);
                }

                if (note.hasLabel('workspace') && !isHoistedNote) {
                    const $enterWorkspaceButton = $('<span class="tree-item-button enter-workspace-button bx bx-door-open" title="Hoist this note (workspace)"></span>');

                    $span.append($enterWorkspaceButton);
                }

                if (note.type === 'search') {
                    const $refreshSearchButton = $('<span class="tree-item-button refresh-search-button bx bx-refresh" title="Refresh saved search results"></span>');

                    $span.append($refreshSearchButton);
                }

                if (!['search', 'launcher'].includes(note.type) && !note.isOptions() && !note.isLaunchBarConfig()) {
                    const $createChildNoteButton = $('<span class="tree-item-button add-note-button bx bx-plus" title="Create child note"></span>');

                    $span.append($createChildNoteButton);
                }
            },
            // this is done to automatically lazy load all expanded notes after tree load
            loadChildren: (event, data) => {
                data.node.visit((subNode) => {
                    // Load all lazy/unloaded child nodes
                    // (which will trigger `loadChildren` recursively)
                    if (subNode.isUndefined() && subNode.isExpanded()) {
                        subNode.load();
                    }
                });
            },
            select: (event, {node}) => {
                $(node.span).find(".fancytree-custom-icon").attr("title",
                    node.isSelected() ? "Apply bulk actions on selected notes" : "");
            }
        });

        if (!utils.isMobile()) {
            this.getHotKeys().then(hotKeys => {
                for (const key in hotKeys) {
                    const handler = hotKeys[key];

                    $(this.tree.$container).on('keydown', null, key, evt => {
                        const node = this.tree.getActiveNode();
                        return handler(node, evt);
                        // return false from the handler will stop default handling.
                    });
                }
            });
        }

        this.$tree.on('contextmenu', '.fancytree-node', e => {
            const node = $.ui.fancytree.getNode(e);
            const note = froca.getNoteFromCache(node.data.noteId);

            if (note.isLaunchBarConfig()) {
                import("../menus/launcher_context_menu.js").then(({default: LauncherContextMenu}) => {
                    const launcherContextMenu = new LauncherContextMenu(this, node);
                    launcherContextMenu.show(e);
                });
            } else {
                import("../menus/tree_context_menu.js").then(({default: TreeContextMenu}) => {
                    const treeContextMenu = new TreeContextMenu(this, node);
                    treeContextMenu.show(e);
                });
            }

            return false; // blocks default browser right click menu
        });

        this.tree = $.ui.fancytree.getTree(this.$tree);
    }

    prepareRootNode() {
        return this.prepareNode(froca.getBranch('none_root'));
    }

    /**
     * @param {NoteShort} parentNote
     */
    prepareChildren(parentNote) {
        utils.assertArguments(parentNote);

        const noteList = [];

        const hideArchivedNotes = this.hideArchivedNotes;

        let childBranches = parentNote.getFilteredChildBranches();

        if (parentNote.type === 'search' && childBranches.length > MAX_SEARCH_RESULTS_IN_TREE) {
            childBranches = childBranches.slice(0, MAX_SEARCH_RESULTS_IN_TREE);
        }

        for (const branch of childBranches) {
            if (hideArchivedNotes) {
                const note = branch.getNoteFromCache();

                if (note.hasLabel('archived')) {
                    continue;
                }
            }

            const node = this.prepareNode(branch);

            noteList.push(node);
        }

        return noteList;
    }

    updateNode(node) {
        const note = froca.getNoteFromCache(node.data.noteId);
        const branch = froca.getBranch(node.data.branchId);

        if (!note) {
            console.log(`Node update not possible because note ${node.data.noteId} was not found.`);
            return;
        }

        if (!branch) {
            console.log(`Node update not possible because branch ${node.data.branchId} was not found.`);
            return;
        }

        const title = `${branch.prefix ? (`${branch.prefix} - `) : ""}${note.title}`;

        node.data.isProtected = note.isProtected;
        node.data.noteType = note.type;
        node.folder = note.isFolder();
        node.icon = note.getIcon();
        node.extraClasses = this.getExtraClasses(note);
        node.title = utils.escapeHtml(title);

        if (node.isExpanded() !== branch.isExpanded) {
            node.setExpanded(branch.isExpanded, {noEvents: true, noAnimation: true});
        }

        node.renderTitle();
    }

    /**
     * @param {Branch} branch
     * @param {boolean} forceLazy
     */
    prepareNode(branch, forceLazy = false) {
        const note = branch.getNoteFromCache();

        if (!note) {
            throw new Error(`Branch "${branch.branchId}" has no child note "${branch.noteId}"`);
        }

        const title = `${branch.prefix ? (`${branch.prefix} - `) : ""}${note.title}`;

        const isFolder = note.isFolder();

        const node = {
            noteId: note.noteId,
            parentNoteId: branch.parentNoteId,
            branchId: branch.branchId,
            isProtected: note.isProtected,
            noteType: note.type,
            title: utils.escapeHtml(title),
            extraClasses: this.getExtraClasses(note),
            icon: note.getIcon(isFolder),
            refKey: note.noteId,
            lazy: true,
            folder: isFolder,
            expanded: branch.isExpanded && note.type !== 'search',
            key: utils.randomString(12) // this should prevent some "duplicate key" errors
        };

        if (isFolder && node.expanded && !forceLazy) {
            node.children = this.prepareChildren(note);
        }

        return node;
    }

    getExtraClasses(note) {
        utils.assertArguments(note);

        const extraClasses = [];

        if (note.isProtected) {
            extraClasses.push("protected");
        }

        if (note.isShared()) {
            extraClasses.push("shared");
        }
        else if (note.getParentNoteIds().length > 1) {
            const realClones = note.getParentNoteIds()
                .map(noteId => froca.notes[noteId])
                .filter(note => !!note)
                .filter(note =>
                    !['_share', '_lbBookmarks'].includes(note.noteId)
                    && note.type !== 'search');

            if (realClones.length > 1) {
                extraClasses.push("multiple-parents");
            }
        }

        const cssClass = note.getCssClass();

        if (cssClass) {
            extraClasses.push(cssClass);
        }

        extraClasses.push(utils.getNoteTypeClass(note.type));

        if (note.mime) { // some notes should not have mime type (e.g. render)
            extraClasses.push(utils.getMimeTypeClass(note.mime));
        }

        if (note.hasLabel('archived')) {
            extraClasses.push("archived");
        }

        const colorClass = note.getColorClass();

        if (colorClass) {
            extraClasses.push(colorClass);
        }

        return extraClasses.join(" ");
    }

    /** @returns {FancytreeNode[]} */
    getSelectedNodes(stopOnParents = false) {
        return this.tree.getSelectedNodes(stopOnParents);
    }

    /** @returns {FancytreeNode[]} */
    getSelectedOrActiveNodes(node = null) {
        const nodes = this.getSelectedNodes(true);

        // the node you start dragging should be included even if not selected
        if (node && !nodes.find(n => n.key === node.key)) {
            nodes.push(node);
        }

        if (nodes.length === 0) {
            nodes.push(this.getActiveNode());
        }

        return nodes;
    }

    async setExpandedStatusForSubtree(node, isExpanded) {
        if (!node) {
            const hoistedNoteId = hoistedNoteService.getHoistedNoteId();

            node = this.getNodesByNoteId(hoistedNoteId)[0];
        }

        const {branchIds} = await server.put(`branches/${node.data.branchId}/expanded-subtree/${isExpanded ? 1 : 0}`);

        froca.getBranches(branchIds, true)
            .forEach(branch => branch.isExpanded = !!isExpanded);

        await this.batchUpdate(async () => {
            await node.load(true);

            if (node.data.noteId !== hoistedNoteService.getHoistedNoteId()) { // hoisted note should be always expanded
                await node.setExpanded(isExpanded, {noEvents: true, noAnimation: true});
            }
        });

        const activeNode = await this.getNodeFromPath(appContext.tabManager.getActiveContextNotePath());

        if (activeNode) {
            activeNode.setActive({noEvents: true, noFocus: false});
        }
    }

    async expandTree(node = null) {
        await this.setExpandedStatusForSubtree(node, true);
    }

    async collapseTree(node = null) {
        await this.setExpandedStatusForSubtree(node, false);
    }

    collapseTreeEvent() { this.collapseTree(); }

    /**
     * @return {FancytreeNode|null}
     */
    getActiveNode() {
        return this.tree.getActiveNode();
    }

    /**
     * focused & not active node can happen during multiselection where the node is selected
     * but not activated (its content is not displayed in the detail)
     * @return {FancytreeNode|null}
     */
    getFocusedNode() {
        return this.tree.getFocusNode();
    }

    clearSelectedNodes() {
        for (const selectedNode of this.getSelectedNodes()) {
            selectedNode.setSelected(false);
        }
    }

    async scrollToActiveNoteEvent() {
        const activeContext = appContext.tabManager.getActiveContext();

        if (activeContext && activeContext.notePath) {
            this.tree.$container.focus();
            this.tree.setFocus(true);

            const node = await this.expandToNote(activeContext.notePath);

            if (node) {
                await node.makeVisible({scrollIntoView: true});
                node.setActive(true, {noEvents: true, noFocus: false});
            }
        }
    }

    /** @returns {FancytreeNode} */
    async getNodeFromPath(notePath, expand = false, logErrors = true) {
        utils.assertArguments(notePath);
        /** @let {FancytreeNode} */
        let parentNode = this.getNodesByNoteId('root')[0];

        let resolvedNotePathSegments = await treeService.resolveNotePathToSegments(notePath, this.hoistedNoteId, logErrors);

        if (!resolvedNotePathSegments) {
            if (logErrors) {
                logError("Could not find run path for notePath:", notePath);
            }

            return;
        }

        resolvedNotePathSegments = resolvedNotePathSegments.slice(1);

        for (const childNoteId of resolvedNotePathSegments) {
            // we expand only after hoisted note since before then nodes are not actually present in the tree
            if (parentNode) {
                if (!parentNode.isLoaded()) {
                    await parentNode.load();
                }

                if (expand) {
                    await parentNode.setExpanded(true, {noAnimation: true});

                    // although previous line should set the expanded status, it seems to happen asynchronously
                    // so we need to make sure it is set properly before calling updateNode which uses this flag
                    const branch = froca.getBranch(parentNode.data.branchId);
                    branch.isExpanded = true;
                }

                this.updateNode(parentNode);

                let foundChildNode = this.findChildNode(parentNode, childNoteId);

                if (!foundChildNode) { // note might be recently created so we'll force reload and try again
                    await parentNode.load(true);

                    foundChildNode = this.findChildNode(parentNode, childNoteId);

                    if (!foundChildNode) {
                        if (logErrors) {
                            // besides real errors this can be also caused by hiding of e.g. included images
                            // these are real notes with real notePath, user can display them in a detail
                            // but they don't have a node in the tree

                            const childNote = await froca.getNote(childNoteId);

                            if (!childNote || childNote.type !== 'image') {
                                ws.logError(`Can't find node for child node of noteId=${childNoteId} for parent of noteId=${parentNode.data.noteId} and hoistedNoteId=${hoistedNoteService.getHoistedNoteId()}, requested path is ${notePath}`);
                            }
                        }

                        return;
                    }
                }

                parentNode = foundChildNode;
            }
        }

        return parentNode;
    }

    /** @returns {FancytreeNode} */
    findChildNode(parentNode, childNoteId) {
        return parentNode.getChildren().find(childNode => childNode.data.noteId === childNoteId);
    }

    /** @returns {FancytreeNode} */
    async expandToNote(notePath, logErrors = true) {
        return this.getNodeFromPath(notePath, true, logErrors);
    }

    /** @returns {FancytreeNode[]} */
    getNodesByBranch(branch) {
        utils.assertArguments(branch);

        return this.getNodesByNoteId(branch.noteId).filter(node => node.data.branchId === branch.branchId);
    }

    /** @returns {FancytreeNode[]} */
    getNodesByNoteId(noteId) {
        utils.assertArguments(noteId);

        const list = this.tree.getNodesByRef(noteId);
        return list ? list : []; // if no nodes with this refKey are found, fancy tree returns null
    }

    isEnabled() {
        return !!this.noteContext;
    }

    async refresh() {
        this.toggleInt(this.isEnabled());
        this.$treeSettingsPopup.hide();

        this.activityDetected();

        const oldActiveNode = this.getActiveNode();
        let oldActiveNodeFocused = false;

        if (oldActiveNode) {
            oldActiveNodeFocused = oldActiveNode.hasFocus();

            oldActiveNode.setActive(false);
            oldActiveNode.setFocus(false);
        }

        if (this.noteContext
            && this.noteContext.notePath
            && !this.noteContext.note?.isDeleted
            && (!treeService.isNotePathInHiddenSubtree(this.noteContext.notePath) || await hoistedNoteService.isHoistedInHiddenSubtree())
        ) {
            const newActiveNode = await this.getNodeFromPath(this.noteContext.notePath);

            if (newActiveNode) {
                if (!newActiveNode.isVisible()) {
                    await this.expandToNote(this.noteContext.notePath);
                }

                newActiveNode.setActive(true, {noEvents: true, noFocus: !oldActiveNodeFocused});
                newActiveNode.makeVisible({scrollIntoView: true});
            }
        }

        this.filterHoistedBranch();
    }

    async refreshSearch(e) {
        const activeNode = $.ui.fancytree.getNode(e);

        activeNode.load(true);
        activeNode.setExpanded(true, {noAnimation: true});

        toastService.showMessage("Saved search note refreshed.");
    }

    async batchUpdate(cb) {
        try {
            // disable rendering during update for increased performance
            this.tree.enableUpdate(false);

            await cb();
        }
        finally {
            this.tree.enableUpdate(true);
        }
    }

    activityDetected() {
        if (this.autoCollapseTimeoutId) {
            clearTimeout(this.autoCollapseTimeoutId);
        }

        this.autoCollapseTimeoutId = setTimeout(() => {
            if (!this.autoCollapseNoteTree) {
                return;
            }

            /*
             * We're collapsing notes after period of inactivity to "cleanup" the tree - users rarely
             * collapse the notes and the tree becomes unusuably large.
             * Some context: https://github.com/zadam/trilium/issues/1192
             */

            const noteIdsToKeepExpanded = new Set(
                appContext.tabManager.getNoteContexts()
                    .map(nc => nc.notePathArray)
                    .flat()
            );

            let noneCollapsedYet = true;

            this.tree.getRootNode().visit(node => {
                if (node.isExpanded() && !noteIdsToKeepExpanded.has(node.data.noteId)) {
                    node.setExpanded(false);

                    if (noneCollapsedYet) {
                        toastService.showMessage("Auto collapsing notes after inactivity...");
                        noneCollapsedYet = false;
                    }
                }
            }, false);
        }, 600 * 1000);
    }

    async entitiesReloadedEvent({loadResults}) {
        this.activityDetected();

        if (loadResults.isEmptyForTree()) {
            return;
        }

        const activeNode = this.getActiveNode();
        const activeNodeFocused = activeNode && activeNode.hasFocus();
        const nextNode = activeNode ? (activeNode.getNextSibling() || activeNode.getPrevSibling() || activeNode.getParent()) : null;
        const activeNotePath = activeNode ? treeService.getNotePath(activeNode) : null;

        const nextNotePath = nextNode ? treeService.getNotePath(nextNode) : null;
        const activeNoteId = activeNode ? activeNode.data.noteId : null;

        const noteIdsToUpdate = new Set();
        const noteIdsToReload = new Set();

        for (const ecAttr of loadResults.getAttributes()) {
            const dirtyingLabels = ['iconClass', 'cssClass', 'workspace', 'workspaceIconClass', 'color'];

            if (ecAttr.type === 'label' && dirtyingLabels.includes(ecAttr.name)) {
                if (ecAttr.isInheritable) {
                    noteIdsToReload.add(ecAttr.noteId);
                }
                else {
                    noteIdsToUpdate.add(ecAttr.noteId);
                }
            }
            else if (ecAttr.type === 'label' && ecAttr.name === 'archived') {
                const note = froca.getNoteFromCache(ecAttr.noteId);

                if (note) {
                    // change of archived status can mean the note should not be displayed in the tree at all
                    // depending on the value of this.hideArchivedNotes
                    for (const parentNote of note.getParentNotes()) {
                        noteIdsToReload.add(parentNote.noteId);
                    }
                }
            }
            else if (ecAttr.type === 'relation' && ecAttr.name === 'template') {
                // missing handling of things inherited from template
                noteIdsToReload.add(ecAttr.noteId);
            }
            else if (ecAttr.type === 'relation' && ecAttr.name === 'imageLink') {
                const note = froca.getNoteFromCache(ecAttr.noteId);

                if (note && note.getChildNoteIds().includes(ecAttr.value)) {
                    // there's new/deleted imageLink betwen note and its image child - which can show/hide
                    // the image (if there is a imageLink relation between parent and child then it is assumed to be "contained" in the note and thus does not have to be displayed in the tree)
                    noteIdsToReload.add(ecAttr.noteId);
                }
            }
        }

        for (const ecBranch of loadResults.getBranches()) {
            if (ecBranch.parentNoteId === '_share') {
                // all shared notes have a sign in the tree, even the descendants of shared notes
                noteIdsToReload.add(ecBranch.noteId);
            }
            else {
                // adding noteId itself to update all potential clones
                noteIdsToUpdate.add(ecBranch.noteId);
            }

            for (const node of this.getNodesByBranch(ecBranch)) {
                if (ecBranch.isDeleted) {
                    if (node.isActive()) {
                        const newActiveNode = node.getNextSibling()
                            || node.getPrevSibling()
                            || node.getParent();

                        if (newActiveNode) {
                            newActiveNode.setActive(true, {noEvents: true, noFocus: true});
                        }
                    }

                    if (node.getParent()) {
                        node.remove();
                    }

                    noteIdsToUpdate.add(ecBranch.parentNoteId);
                }
            }

            if (!ecBranch.isDeleted) {
                for (const parentNode of this.getNodesByNoteId(ecBranch.parentNoteId)) {
                    if (parentNode.isFolder() && !parentNode.isLoaded()) {
                        continue;
                    }

                    const found = (parentNode.getChildren() || []).find(child => child.data.noteId === ecBranch.noteId);

                    if (!found) {
                        // make sure it's loaded
                        await froca.getNote(ecBranch.noteId);
                        const frocaBranch = froca.getBranch(ecBranch.branchId);

                        // we're forcing lazy since it's not clear if the whole required subtree is in froca
                        parentNode.addChildren([this.prepareNode(frocaBranch, true)]);

                        this.sortChildren(parentNode);

                        // this might be a first child which would force an icon change
                        noteIdsToUpdate.add(ecBranch.parentNoteId);
                    }
                }
            }
        }

        for (const noteId of loadResults.getNoteIds()) {
            noteIdsToUpdate.add(noteId);
        }

        await this.batchUpdate(async () => {
            for (const noteId of noteIdsToReload) {
                for (const node of this.getNodesByNoteId(noteId)) {
                    await node.load(true);

                    noteIdsToUpdate.add(noteId);
                }
            }

            for (const parentNoteId of loadResults.getNoteReorderings()) {
                for (const node of this.getNodesByNoteId(parentNoteId)) {
                    if (node.isLoaded()) {
                        this.sortChildren(node);
                    }
                }
            }
        });

        // for some reason node update cannot be in the batchUpdate() block (node is not re-rendered)
        for (const noteId of noteIdsToUpdate) {
            for (const node of this.getNodesByNoteId(noteId)) {
                this.updateNode(node);
            }
        }

        if (activeNotePath) {
            let node = await this.expandToNote(activeNotePath, false);

            if (node && node.data.noteId !== activeNoteId) {
                // if the active note has been moved elsewhere then it won't be found by the path,
                // so we switch to the alternative of trying to find it by noteId
                const notesById = this.getNodesByNoteId(activeNoteId);

                // if there are multiple clones then we'd rather not activate any one
                node = notesById.length === 1 ? notesById[0] : null;
            }

            if (node) {
                if (activeNodeFocused) {
                    // needed by Firefox: https://github.com/zadam/trilium/issues/1865
                    this.tree.$container.focus();
                }

                await node.setActive(true, {noEvents: true, noFocus: !activeNodeFocused});
            }
            else {
                // this is used when original note has been deleted, and we want to move the focus to the note above/below
                node = await this.expandToNote(nextNotePath, false);

                if (node) {
                    // FIXME: this is conceptually wrong
                    //        here note tree is responsible for updating global state of the application
                    //        this should be done by NoteContext / TabManager and note tree should only listen to
                    //        changes in active note and just set the "active" state
                    // We don't await since that can bring up infinite cycles when e.g. custom widget does some backend requests which wait for max sync ID processed
                    appContext.tabManager.getActiveContext().setNote(nextNotePath).then(() => {
                        const newActiveNode = this.getActiveNode();

                        // return focus if the previously active node was also focused
                        if (newActiveNode && activeNodeFocused) {
                            newActiveNode.setFocus(true);
                        }
                    });
                }
            }
        }

        if (noteIdsToReload.size > 0 || noteIdsToUpdate.size > 0) {
            // workaround for https://github.com/mar10/fancytree/issues/1054
            this.filterHoistedBranch();
        }
    }

    sortChildren(node) {
        node.sortChildren((nodeA, nodeB) => {
            const branchA = froca.branches[nodeA.data.branchId];
            const branchB = froca.branches[nodeB.data.branchId];

            if (!branchA || !branchB) {
                return 0;
            }

            return branchA.notePosition - branchB.notePosition;
        });
    }

    setExpanded(branchId, isExpanded) {
        utils.assertArguments(branchId);

        const branch = froca.getBranch(branchId, true);

        if (!branch) {
            if (branchId && branchId.startsWith('virt')) {
                // in case of virtual branches there's nothing to update
                return;
            }
            else {
                logError(`Cannot find branch=${branchId}`);
                return;
            }
        }

        branch.isExpanded = isExpanded;

        server.put(`branches/${branchId}/expanded/${isExpanded ? 1 : 0}`);
    }

    async reloadTreeFromCache() {
        const activeNode = this.getActiveNode();

        const activeNotePath = activeNode !== null ? treeService.getNotePath(activeNode) : null;

        const rootNode = this.prepareRootNode();

        await this.batchUpdate(async () => {
            await this.tree.reload([rootNode]);
        });

        if (activeNotePath) {
            const node = await this.getNodeFromPath(activeNotePath, true);

            if (node) {
                await node.setActive(true, {noEvents: true, noFocus: true});
            }
        }
    }

    async hoistedNoteChangedEvent({ntxId}) {
        if (this.isNoteContext(ntxId)) {
            await this.filterHoistedBranch();
        }
    }

    async filterHoistedBranch() {
        if (!this.noteContext) {
            return;
        }

        const hoistedNotePath = await treeService.resolveNotePath(this.noteContext.hoistedNoteId);
        await this.getNodeFromPath(hoistedNotePath);

        if (this.noteContext.hoistedNoteId === 'root') {
            this.tree.clearFilter();
            this.toggleHiddenNode(false); // show everything but the hidden subtree
        } else {
            // hack when hoisted note is cloned then it could be filtered multiple times while we want only 1
            this.tree.filterBranches(node =>
                node.data.noteId === this.noteContext.hoistedNoteId // optimization to not having always resolve the node path
                && treeService.getNotePath(node) === hoistedNotePath);

            this.toggleHiddenNode(true); // hoisting will handle hidden note visibility
        }
    }

    toggleHiddenNode(show) {
        const hiddenNode = this.getNodesByNoteId('_hidden')[0];
        $(hiddenNode.li).toggleClass("hidden-node-is-hidden", !show);
    }

    frocaReloadedEvent() {
        this.reloadTreeFromCache();
    }

    async getHotKeys() {
        const actions = await keyboardActionsService.getActionsForScope('note-tree');
        const hotKeyMap = {};

        for (const action of actions) {
            for (const shortcut of action.effectiveShortcuts) {
                hotKeyMap[shortcutService.normalizeShortcut(shortcut)] = node => {
                    const notePath = treeService.getNotePath(node);

                    this.triggerCommand(action.actionName, {node, notePath});

                    return false;
                }
            }
        }

        return hotKeyMap;
    }

    /**
     * @param {FancytreeNode} node
     */
    getSelectedOrActiveBranchIds(node) {
        const nodes = this.getSelectedOrActiveNodes(node);

        return nodes.map(node => node.data.branchId);
    }

    /**
     * @param {FancytreeNode} node
     */
    getSelectedOrActiveNoteIds(node) {
        const nodes = this.getSelectedOrActiveNodes(node);

        return nodes.map(node => node.data.noteId);
    }

    async deleteNotesCommand({node}) {
        const branchIds = this.getSelectedOrActiveBranchIds(node)
            .filter(branchId => !branchId.startsWith('virt-')); // search results can't be deleted

        if (!branchIds.length) {
            return;
        }

        await branchService.deleteNotes(branchIds);

        this.clearSelectedNodes();
    }

    canBeMovedUpOrDown(node) {
        if (node.data.noteId === 'root') {
            return false;
        }

        const parentNote = froca.getNoteFromCache(node.getParent().data.noteId);

        if (parentNote && parentNote.hasLabel('sorted')) {
            return false;
        }

        return true;
    }

    moveNoteUpCommand({node}) {
        if (!this.canBeMovedUpOrDown(node)) {
            return;
        }

        const beforeNode = node.getPrevSibling();

        if (beforeNode !== null) {
            branchService.moveBeforeBranch([node.data.branchId], beforeNode.data.branchId);
        }
    }

    moveNoteDownCommand({node}) {
        if (!this.canBeMovedUpOrDown(node)) {
            return;
        }

        const afterNode = node.getNextSibling();

        if (afterNode !== null) {
            branchService.moveAfterBranch([node.data.branchId], afterNode.data.branchId);
        }
    }

    moveNoteUpInHierarchyCommand({node}) {
        branchService.moveNodeUpInHierarchy(node);
    }

    moveNoteDownInHierarchyCommand({node}) {
        const toNode = node.getPrevSibling();

        if (toNode !== null) {
            branchService.moveToParentNote([node.data.branchId], toNode.data.branchId);
        }
    }

    addNoteAboveToSelectionCommand() {
        const node = this.getFocusedNode();

        if (!node) {
            return;
        }

        if (node.isActive()) {
            node.setSelected(true);
        }

        const prevSibling = node.getPrevSibling();

        if (prevSibling) {
            prevSibling.setActive(true, {noEvents: true});

            if (prevSibling.isSelected()) {
                node.setSelected(false);
            }

            prevSibling.setSelected(true);
        }
    }

    addNoteBelowToSelectionCommand() {
        const node = this.getFocusedNode();

        if (!node) {
            return;
        }

        if (node.isActive()) {
            node.setSelected(true);
        }

        const nextSibling = node.getNextSibling();

        if (nextSibling) {
            nextSibling.setActive(true, {noEvents: true});

            if (nextSibling.isSelected()) {
                node.setSelected(false);
            }

            nextSibling.setSelected(true);
        }
    }

    expandSubtreeCommand({node}) {
        this.expandTree(node);
    }

    collapseSubtreeCommand({node}) {
        this.collapseTree(node);
    }

    async recentChangesInSubtreeCommand({node}) {
        this.triggerCommand("showRecentChanges", {ancestorNoteId: node.data.noteId});
    }

    selectAllNotesInParentCommand({node}) {
        for (const child of node.getParent().getChildren()) {
            child.setSelected(true);
        }
    }

    copyNotesToClipboardCommand({node}) {
        clipboard.copy(this.getSelectedOrActiveBranchIds(node));
    }

    cutNotesToClipboardCommand({node}) {
        clipboard.cut(this.getSelectedOrActiveBranchIds(node));
    }

    pasteNotesFromClipboardCommand({node}) {
        clipboard.pasteInto(node.data.branchId);
    }

    pasteNotesAfterFromClipboardCommand({node}) {
        clipboard.pasteAfter(node.data.branchId);
    }

    async exportNoteCommand({node}) {
        const notePath = treeService.getNotePath(node);

        this.triggerCommand("showExportDialog", {notePath, defaultType: "subtree"});
    }

    async importIntoNoteCommand({node}) {
        this.triggerCommand("showImportDialog", {noteId: node.data.noteId});
    }

    forceNoteSyncCommand({node}) {
        syncService.forceNoteSync(node.data.noteId);
    }

    editNoteTitleCommand({node}) {
        appContext.triggerCommand('focusOnTitle');
    }

    protectSubtreeCommand({node}) {
        protectedSessionService.protectNote(node.data.noteId, true, true);
    }

    unprotectSubtreeCommand({node}) {
        protectedSessionService.protectNote(node.data.noteId, false, true);
    }

    duplicateSubtreeCommand({node}) {
        const nodesToDuplicate = this.getSelectedOrActiveNodes(node);

        for (const nodeToDuplicate of nodesToDuplicate) {
            const note = froca.getNoteFromCache(nodeToDuplicate.data.noteId);

            if (note.isProtected && !protectedSessionHolder.isProtectedSessionAvailable()) {
                continue;
            }

            const branch = froca.getBranch(nodeToDuplicate.data.branchId);

            noteCreateService.duplicateSubtree(nodeToDuplicate.data.noteId, branch.parentNoteId);
        }
    }

    moveShortcutToVisibleCommand({node, selectedOrActiveBranchIds}) {
        branchService.moveToParentNote(selectedOrActiveBranchIds, '_lbVisibleLaunchers');
    }

    moveShortcutToAvailableCommand({node, selectedOrActiveBranchIds}) {
        branchService.moveToParentNote(selectedOrActiveBranchIds, '_lbAvailableLaunchers');
    }

    addNoteLauncherCommand({node}) {
        this.createLauncherNote(node, 'note');
    }

    addScriptLauncherCommand({node}) {
        this.createLauncherNote(node, 'script');
    }

    addWidgetLauncherCommand({node}) {
        this.createLauncherNote(node, 'customWidget');
    }

    addSpacerLauncherCommand({node}) {
        this.createLauncherNote(node, 'spacer');
    }

    async createLauncherNote(node, launcherType) {
        const resp = await server.post(`special-notes/launchers/${node.data.noteId}/${launcherType}`);

        if (!resp.success) {
            toastService.showError(resp.message);
        }

        await ws.waitForMaxKnownEntityChangeId();

        appContext.tabManager.getActiveContext().setNote(resp.note.noteId);
    }
}