import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
import { action, computed, observable } from "mobx";
import { observer } from "mobx-react";
import { DataSym, Doc, DocListCast, Field, HeightSym, Opt, WidthSym, DocListCastOrNull } from '../../../fields/Doc';
import { Id } from '../../../fields/FieldSymbols';
import { List } from '../../../fields/List';
import { Document, listSpec } from '../../../fields/Schema';
import { ComputedField, ScriptField } from '../../../fields/ScriptField';
import { BoolCast, Cast, NumCast, ScriptCast, StrCast } from '../../../fields/Types';
import { emptyFunction, emptyPath, returnFalse, returnOne, returnTrue, returnZero, simulateMouseClick, Utils, returnEmptyFilter, returnEmptyDoclist } from '../../../Utils';
import { Docs, DocUtils } from '../../documents/Documents';
import { DocumentType } from "../../documents/DocumentTypes";
import { SnappingManager } from '../../util/SnappingManager';
import { DragManager, dropActionType } from "../../util/DragManager";
import { Scripting } from '../../util/Scripting';
import { SelectionManager } from '../../util/SelectionManager';
import { Transform } from '../../util/Transform';
import { undoBatch, UndoManager } from '../../util/UndoManager';
import { ContextMenu } from '../ContextMenu';
import { ContextMenuProps } from '../ContextMenuItem';
import { EditableView } from "../EditableView";
import { ContentFittingDocumentView } from '../nodes/ContentFittingDocumentView';
import { DocumentView } from '../nodes/DocumentView';
import { KeyValueBox } from '../nodes/KeyValueBox';
import { Templates } from '../Templates';
import { CollectionSubView } from "./CollectionSubView";
import "./CollectionTreeView.scss";
import { CollectionViewType, CollectionView } from './CollectionView';
import React = require("react");
import { TraceMobx } from '../../../fields/util';
import { CurrentUserUtils } from '../../util/CurrentUserUtils';
import { FormattedTextBox } from '../nodes/formattedText/FormattedTextBox';
import { RichTextField } from '../../../fields/RichTextField';
import { RichTextMenu } from '../nodes/formattedText/RichTextMenu';

export interface TreeViewProps {
    document: Doc;
    dataDoc?: Doc;
    containingCollection: Doc;
    prevSibling?: Doc;
    renderDepth: number;
    removeDoc: ((doc: Doc | Doc[]) => boolean) | undefined;
    moveDocument: DragManager.MoveFunction;
    dropAction: dropActionType;
    addDocTab: (doc: Doc, where: string, libraryPath?: Doc[]) => boolean;
    pinToPres: (document: Doc) => void;
    panelWidth: () => number;
    panelHeight: () => number;
    ChromeHeight: undefined | (() => number);
    addDocument: (doc: Doc | Doc[], relativeTo?: Doc, before?: boolean) => boolean;
    indentDocument?: () => void;
    outdentDocument?: () => void;
    ScreenToLocalTransform: () => Transform;
    backgroundColor?: (doc: Doc, renderDepth: number) => string | undefined;
    outerXf: () => { translateX: number, translateY: number };
    treeView: CollectionTreeView;
    parentKey: string;
    active: (outsideReaction?: boolean) => boolean;
    treeViewHideHeaderFields: () => boolean;
    treeViewPreventOpen: boolean;
    renderedIds: string[]; // list of document ids rendered used to avoid unending expansion of items in a cycle
    onCheckedClick?: () => ScriptField;
    onChildClick?: () => ScriptField;
    ignoreFields?: string[];
    firstLevel: boolean;
    whenActiveChanged: (isActive: boolean) => void;
}

@observer
/**
 * Renders a treeView of a collection of documents
 * 
 * special fields:
 * treeViewOpen : flag denoting whether the documents sub-tree (contents) is visible or hidden
 * treeViewPreventOpen : ignores the treeViewOpen flag (for allowing a view to not be slaved to other views of the document)
 * treeViewExpandedView : name of field whose contents are being displayed as the document's subtree
 */
class TreeView extends React.Component<TreeViewProps> {
    private _editTitleScript: (() => ScriptField) | undefined;
    private _openScript: (() => ScriptField) | undefined;
    private _header?: React.RefObject<HTMLDivElement> = React.createRef();
    private _treedropDisposer?: DragManager.DragDropDisposer;
    private _dref = React.createRef<HTMLDivElement>();
    private _tref = React.createRef<HTMLDivElement>();
    private _docRef = React.createRef<DocumentView>();
    private _uniqueId = Utils.GenerateGuid();
    private _editMaxWidth: number | string = 0;

    get doc() { return this.props.document; }
    get noviceMode() { return BoolCast(Doc.UserDoc().noviceMode, false); }
    get displayName() { return "TreeView(" + this.doc.title + ")"; }  // this makes mobx trace() statements more descriptive
    get treeViewLockExpandedView() { return this.doc.treeViewLockExpandedView; }
    get defaultExpandedView() { return StrCast(this.doc.treeViewDefaultExpandedView, this.noviceMode || this.outlineMode ? "layout" : "fields"); }
    get treeViewDefaultExpandedView() { return this.treeViewLockExpandedView ? this.defaultExpandedView : (this.childDocs ? this.fieldKey : this.defaultExpandedView); }
    @observable _overrideTreeViewOpen = false; // override of the treeViewOpen field allowing the display state to be independent of the document's state
    set treeViewOpen(c: boolean) {
        if (this.props.treeViewPreventOpen) this._overrideTreeViewOpen = c;
        else this.doc.treeViewOpen = this._overrideTreeViewOpen = c;
    }
    @computed get outlineMode() { return this.props.treeView.doc.treeViewOutlineMode; }
    @computed get treeViewOpen() { return (!this.props.treeViewPreventOpen && !this.doc.treeViewPreventOpen && BoolCast(this.doc.treeViewOpen)) || this._overrideTreeViewOpen; }
    @computed get treeViewExpandedView() { return StrCast(this.doc.treeViewExpandedView, this.treeViewDefaultExpandedView); }
    @computed get MAX_EMBED_HEIGHT() { return NumCast(this.props.containingCollection.maxEmbedHeight, 200); }
    @computed get dataDoc() { return this.doc[DataSym]; }
    @computed get layoutDoc() { return Doc.Layout(this.doc); }
    @computed get fieldKey() { const splits = StrCast(Doc.LayoutField(this.doc)).split("fieldKey={\'"); return splits.length > 1 ? splits[1].split("\'")[0] : "data"; }
    childDocList(field: string) {
        const layout = Doc.LayoutField(this.doc) instanceof Doc ? Doc.LayoutField(this.doc) as Doc : undefined;
        return ((this.props.dataDoc ? DocListCastOrNull(this.props.dataDoc[field]) : undefined) || // if there's a data doc for an expanded template, use it's data field
            (layout ? DocListCastOrNull(layout[field]) : undefined) || // else if there's a layout doc, display it's fields
            DocListCastOrNull(this.doc[field])); // otherwise use the document's data field
    }
    @computed get childDocs() { return this.childDocList(this.fieldKey); }
    @computed get childLinks() { return this.childDocList("links"); }
    @computed get childAnnos() { return this.childDocList(this.fieldKey + "-annotations"); }
    @computed get boundsOfCollectionDocument() {
        return StrCast(this.props.document.type).indexOf(DocumentType.COL) === -1 || !DocListCast(this.props.document[this.fieldKey]).length ? undefined :
            Doc.ComputeContentBounds(DocListCast(this.props.document[this.fieldKey]));
    }

    @undoBatch openRight = () => this.props.addDocTab(this.doc, "add:right");
    @undoBatch move = (doc: Doc | Doc[], target: Doc | undefined, addDoc: (doc: Doc | Doc[]) => boolean) => {
        return this.doc !== target && this.props.removeDoc?.(doc) === true && addDoc(doc);
    }
    @undoBatch @action remove = (doc: Doc | Doc[], key: string) => {
        this.props.treeView.props.select(false);
        return (doc instanceof Doc ? [doc] : doc).reduce((flg, doc) => flg && Doc.RemoveDocFromList(this.dataDoc, key, doc), true);
    }
    @undoBatch @action removeDoc = (doc: Doc | Doc[]) => this.remove(doc, Doc.LayoutFieldKey(this.doc));

    constructor(props: any) {
        super(props);
        const titleScript = ScriptField.MakeScript(`{setInPlace(self, 'editTitle', '${this._uniqueId}'); documentView.select();} `, { documentView: "any" });
        const openScript = ScriptField.MakeScript(`openOnRight(self)`);
        const treeOpenScript = ScriptField.MakeScript(`self.treeViewOpen = !self.treeViewOpen`);
        this._editTitleScript = !Doc.IsSystem(this.props.document) ? titleScript && (() => titleScript) : treeOpenScript && (() => treeOpenScript);
        this._openScript = !Doc.IsSystem(this.props.document) ? openScript && (() => openScript) : undefined;
        if (Doc.GetT(this.doc, "editTitle", "string", true) === "*") Doc.SetInPlace(this.doc, "editTitle", this._uniqueId, false);
    }

    protected createTreeDropTarget = (ele: HTMLDivElement) => {
        this._treedropDisposer?.();
        ele && (this._treedropDisposer = DragManager.MakeDropTarget(ele, this.treeDrop.bind(this), undefined, this.preTreeDrop.bind(this)), this.doc);
    }

    componentWillUnmount() {
        document.removeEventListener("pointermove", this.onDragMove, true);
    }

    onPointerEnter = (e: React.PointerEvent): void => {
        this.props.active(true) && Doc.BrushDoc(this.dataDoc);
        if (e.buttons === 1 && SnappingManager.GetIsDragging()) {
            this._header!.current!.className = "treeViewItem-header";
            document.removeEventListener("pointermove", this.onDragMove, true);
            document.addEventListener("pointermove", this.onDragMove, true);
        }
    }
    onPointerLeave = (e: React.PointerEvent): void => {
        Doc.UnBrushDoc(this.dataDoc);
        if (this._header?.current?.className !== "treeViewItem-header-editing") {
            this._header!.current!.className = "treeViewItem-header";
        }
        document.removeEventListener("pointermove", this.onDragMove, true);
    }
    onDragMove = (e: PointerEvent): void => {
        Doc.UnBrushDoc(this.dataDoc);
        const pt = [e.clientX, e.clientY];
        const rect = this._header!.current!.getBoundingClientRect();
        const before = pt[1] < rect.top + rect.height / 2;
        const inside = pt[0] > Math.min(rect.left + 75, rect.left + rect.width * .75) || (!before && this.treeViewOpen && this.childDocList.length);
        this._header!.current!.className = "treeViewItem-header";
        if (inside) this._header!.current!.className += " treeViewItem-header-inside";
        else if (before) this._header!.current!.className += " treeViewItem-header-above";
        else if (!before) this._header!.current!.className += " treeViewItem-header-below";
        e.stopPropagation();
    }

    public static makeTextBullet() {
        const bullet = Docs.Create.TextDocument("", { title: "-title-", _viewType: CollectionViewType.Tree, hideLinkButton: true, treeViewOutlineMode: true, x: 0, y: 0, _xMargin: 0, _yMargin: 0, _autoHeight: true, _singleLine: true, _backgroundColor: "transparent", _width: 2000, _height: 10, templates: new List<string>([Templates.Title.Layout]) });
        Doc.GetProto(bullet).layout = CollectionView.LayoutString("data");
        Doc.GetProto(bullet).title = ComputedField.MakeFunction('self.text?.Text');
        Doc.GetProto(bullet).data = new List<Doc>([]);
        Doc.SetInPlace(bullet, "editTitle", "*", false);
        FormattedTextBox.SelectOnLoad = bullet[Id];
        return bullet;
    }

    makeTextCollection = () => {
        Doc.SetInPlace(this.doc, "editTitle", undefined, false);
        const bullet = TreeView.makeTextBullet();
        const added = this.props.addDocument(bullet);
        bullet.context = this.props.treeView.Document;
        return added;
    }

    editableView = (key: string, style?: string) => (<EditableView
        oneLine={true}
        display={"inline-block"}
        editing={true}
        contents={StrCast(this.doc[key])}
        height={12}
        sizeToContent={true}
        fontStyle={style}
        fontSize={12}
        GetValue={() => StrCast(this.doc[key])}
        SetValue={undoBatch((value: string, shiftKey: boolean, enterKey: boolean) => {
            if (this.outlineMode && enterKey) {
                Doc.SetInPlace(this.doc, key, value, false);
                this.makeTextCollection();
            } else {
                Doc.SetInPlace(this.doc, key, value, false) || true;
                Doc.SetInPlace(this.doc, "editTitle", undefined, false);
            }
        })}
        onClick={() => {
            SelectionManager.DeselectAll();
            Doc.UserDoc().activeSelection = new List([this.doc]);
            return false;
        }}
        OnEmpty={undoBatch(() => this.props.treeView.doc.treeViewOutlineMode && this.props.removeDoc?.(this.doc))}
        OnTab={undoBatch((shift?: boolean) => {
            shift ? this.props.outdentDocument?.() : this.props.indentDocument?.();
            setTimeout(() => Doc.SetInPlace(this.doc, "editTitle", `${this.props.treeView._uniqueId}`, false), 0);
        })}
    />)

    preTreeDrop = (e: Event, de: DragManager.DropEvent, targetAction: dropActionType) => {
        const dragData = de.complete.docDragData;
        dragData && (dragData.dropAction = this.props.treeView.props.Document === dragData.treeViewDoc ? "same" : dragData.dropAction);
    }

    @undoBatch
    treeDrop = (e: Event, de: DragManager.DropEvent) => {
        const pt = [de.x, de.y];
        const rect = this._header!.current!.getBoundingClientRect();
        const before = pt[1] < rect.top + rect.height / 2;
        const inside = pt[0] > Math.min(rect.left + 75, rect.left + rect.width * .75) || (!before && this.treeViewOpen && this.childDocList.length);
        const complete = de.complete;
        if (complete.linkDragData) {
            const sourceDoc = complete.linkDragData.linkSourceDocument;
            const destDoc = this.doc;
            DocUtils.MakeLink({ doc: sourceDoc }, { doc: destDoc }, "tree link", "");
            e.stopPropagation();
        }
        const docDragData = complete.docDragData;
        if (docDragData) {
            e.stopPropagation();
            if (docDragData.draggedDocuments[0] === this.doc) return true;
            const parentAddDoc = (doc: Doc | Doc[]) => this.props.addDocument(doc, undefined, before);
            let addDoc = parentAddDoc;
            if (inside) {
                const localAdd = (doc: Doc) => {
                    const added = Doc.AddDocToList(this.dataDoc, this.fieldKey, doc);
                    added && (doc.context = this.doc.context);
                    return added;
                }
                addDoc = (doc: Doc | Doc[]) => (doc instanceof Doc ? [doc] : doc).reduce(
                    (flg: boolean, doc) => flg && localAdd(doc), true) || parentAddDoc(doc);
            }
            const move = (!docDragData.dropAction || docDragData.dropAction === "move" || docDragData.dropAction === "same") && docDragData.moveDocument;
            return docDragData.droppedDocuments.reduce((added, d) => (move ? docDragData.moveDocument?.(d, undefined, addDoc) : addDoc(d)) || added, false);
        }
        return false;
    }

    refTransform = (ref: HTMLDivElement) => {
        const { scale, translateX, translateY } = Utils.GetScreenTransform(ref);
        const outerXf = this.props.outerXf();
        const offset = this.props.ScreenToLocalTransform().transformDirection(outerXf.translateX - translateX, outerXf.translateY - translateY);
        return this.props.ScreenToLocalTransform().translate(offset[0], offset[1]);
    }
    docTransform = () => this.refTransform(this._dref.current!);
    getTransform = () => this.refTransform(this._tref.current!);
    docWidth = () => {
        const layoutDoc = this.layoutDoc;
        const aspect = NumCast(layoutDoc._nativeHeight, layoutDoc._fitWidth ? 0 : layoutDoc[HeightSym]()) / NumCast(layoutDoc._nativeWidth, layoutDoc._fitWidth ? 1 : layoutDoc[WidthSym]());
        if (aspect) return Math.min(layoutDoc[WidthSym](), Math.min(this.MAX_EMBED_HEIGHT / aspect, this.props.panelWidth() - 20));
        return NumCast(layoutDoc._nativeWidth) ? Math.min(layoutDoc[WidthSym](), this.props.panelWidth() - 20) : this.props.panelWidth() - 20;
    }
    docHeight = () => {
        const layoutDoc = this.layoutDoc;
        const bounds = this.boundsOfCollectionDocument;
        return Math.max(70, Math.min(this.MAX_EMBED_HEIGHT, (() => {
            const aspect = NumCast(layoutDoc._nativeHeight, layoutDoc._fitWidth ? 0 : layoutDoc[HeightSym]()) / NumCast(layoutDoc._nativeWidth, layoutDoc._fitWidth ? 1 : layoutDoc[WidthSym]());
            if (aspect) return this.docWidth() * aspect;
            if (bounds) return this.docWidth() * (bounds.b - bounds.y) / (bounds.r - bounds.x);
            return layoutDoc._fitWidth ? (!this.doc._nativeHeight ? NumCast(this.props.containingCollection._height) :
                Math.min(this.docWidth() * NumCast(layoutDoc.scrollHeight, NumCast(layoutDoc._nativeHeight)) / NumCast(layoutDoc._nativeWidth,
                    NumCast(this.props.containingCollection._height)))) :
                NumCast(layoutDoc._height) ? NumCast(layoutDoc._height) : 50;
        })()));
    }

    @computed get expandedField() {
        const ids: { [key: string]: string } = {};
        const doc = this.doc;
        doc && Object.keys(doc).forEach(key => !(key in ids) && doc[key] !== ComputedField.undefined && (ids[key] = key));

        const rows: JSX.Element[] = [];
        for (const key of Object.keys(ids).slice().sort()) {
            if (this.props.ignoreFields?.includes(key) || key === "title" || key === "treeViewOpen") continue;
            const contents = doc[key];
            let contentElement: (JSX.Element | null)[] | JSX.Element = [];

            if (contents instanceof Doc || (Cast(contents, listSpec(Doc)) && (Cast(contents, listSpec(Doc))!.length && Cast(contents, listSpec(Doc))![0] instanceof Doc))) {
                const remDoc = (doc: Doc | Doc[]) => this.remove(doc, key);
                const localAdd = (doc: Doc, addBefore?: Doc, before?: boolean) => {
                    const added = Doc.AddDocToList(this.dataDoc, key, doc, addBefore, before, false, true);
                    added && (doc.context = this.doc.context);
                    return added;
                }
                const addDoc = (doc: Doc | Doc[], addBefore?: Doc, before?: boolean) => (doc instanceof Doc ? [doc] : doc).reduce((flg, doc) => flg && localAdd(doc, addBefore, before), true);
                contentElement = TreeView.GetChildElements(contents instanceof Doc ? [contents] : DocListCast(contents),
                    this.props.treeView, doc, undefined, key, this.props.containingCollection, this.props.prevSibling, addDoc, remDoc, this.move,
                    this.props.dropAction, this.props.addDocTab, this.props.pinToPres, this.props.backgroundColor, this.props.ScreenToLocalTransform, this.props.outerXf, this.props.active,
                    this.props.panelWidth, this.props.ChromeHeight, this.props.renderDepth, this.props.treeViewHideHeaderFields, this.props.treeViewPreventOpen,
                    [...this.props.renderedIds, doc[Id]], this.props.onCheckedClick, this.props.onChildClick, this.props.ignoreFields, false, this.props.whenActiveChanged);
            } else {
                contentElement = <EditableView key="editableView"
                    contents={contents !== undefined ? Field.toString(contents as Field) : "null"}
                    height={13}
                    fontSize={12}
                    GetValue={() => Field.toKeyValueString(doc, key)}
                    SetValue={(value: string) => KeyValueBox.SetField(doc, key, value, true)} />;
            }
            rows.push(<div style={{ display: "flex" }} key={key}>
                <span style={{ fontWeight: "bold" }}>{key + ":"}</span>
                &nbsp;
                {contentElement}
            </div>);
        }
        rows.push(<div style={{ display: "flex" }} key={"newKeyValue"}>
            <EditableView
                key="editableView"
                contents={"+key:value"}
                height={13}
                fontSize={12}
                GetValue={() => ""}
                SetValue={(value: string) => {
                    value.indexOf(":") !== -1 && KeyValueBox.SetField(doc, value.substring(0, value.indexOf(":")), value.substring(value.indexOf(":") + 1, value.length), true);
                    return true;
                }} />
        </div>);
        return rows;
    }

    rtfWidth = () => Math.min(this.layoutDoc?.[WidthSym](), this.props.panelWidth() - 20);
    rtfHeight = () => this.rtfWidth() <= this.layoutDoc?.[WidthSym]() ? Math.min(this.layoutDoc?.[HeightSym](), this.MAX_EMBED_HEIGHT) : this.MAX_EMBED_HEIGHT;
    rtfOutlineHeight = () => Math.max(this.layoutDoc?.[HeightSym](), 20);

    @computed get renderContent() {
        TraceMobx();
        const expandKey = this.treeViewExpandedView;
        if (["links", "annotations", this.fieldKey].includes(expandKey)) {
            const remDoc = (doc: Doc | Doc[]) => this.remove(doc, expandKey);
            const localAdd = (doc: Doc, addBefore?: Doc, before?: boolean) => {
                const added = Doc.AddDocToList(this.dataDoc, expandKey, doc, addBefore, before, false, true);
                added && (doc.context = this.doc.context);
                return added;
            }
            const addDoc = (doc: Doc | Doc[], addBefore?: Doc, before?: boolean) => (doc instanceof Doc ? [doc] : doc).reduce((flg, doc) => flg && localAdd(doc, addBefore, before), true);
            const docs = expandKey === "links" ? this.childLinks : expandKey === "annotations" ? this.childAnnos : this.childDocs;
            const sortKey = `${this.fieldKey}-sortAscending`;
            return <ul key={expandKey + "more"} className={this.doc.treeViewHideTitle ? "no-indent" : ""} onClick={(e) => {
                !this.outlineMode && (this.doc[sortKey] = (this.doc[sortKey] ? false : (this.doc[sortKey] === false ? undefined : true)));
                e.stopPropagation();
            }}>
                {!docs ? (null) :
                    TreeView.GetChildElements(docs, this.props.treeView, this.layoutDoc,
                        this.dataDoc, expandKey, this.props.containingCollection, this.props.prevSibling, addDoc, remDoc, this.move,
                        StrCast(this.doc.childDropAction, this.props.dropAction) as dropActionType, this.props.addDocTab, this.props.pinToPres, this.props.backgroundColor, this.props.ScreenToLocalTransform,
                        this.props.outerXf, this.props.active, this.props.panelWidth, this.props.ChromeHeight, this.props.renderDepth, this.props.treeViewHideHeaderFields, this.props.treeViewPreventOpen,
                        [...this.props.renderedIds, this.doc[Id]], this.props.onCheckedClick, this.props.onChildClick, this.props.ignoreFields, false, this.props.whenActiveChanged)}
            </ul >;
        } else if (this.treeViewExpandedView === "fields") {
            return <ul key={this.doc[Id] + this.doc.title}><div ref={this._dref} style={{ display: "inline-block" }} >
                {this.expandedField}
            </div></ul>;
        } else {
            const layoutDoc = this.layoutDoc;
            const panelHeight = StrCast(Doc.LayoutField(layoutDoc)).includes("FormattedTextBox") ? this.rtfHeight : this.docHeight;
            const panelWidth = StrCast(Doc.LayoutField(layoutDoc)).includes("FormattedTextBox") ? this.rtfWidth : this.docWidth;
            return <div ref={this._dref} style={{ display: "inline-block", height: panelHeight() }} key={this.doc[Id]}>
                <ContentFittingDocumentView
                    Document={this.doc}
                    DataDoc={undefined}
                    LibraryPath={emptyPath}
                    renderDepth={this.props.renderDepth + 1}
                    rootSelected={returnTrue}
                    treeViewDoc={undefined}
                    backgroundColor={this.props.backgroundColor}
                    fitToBox={this.boundsOfCollectionDocument !== undefined}
                    FreezeDimensions={true}
                    NativeWidth={layoutDoc.type === DocumentType.RTF ? this.rtfWidth : undefined}
                    NativeHeight={layoutDoc.type === DocumentType.RTF ? this.rtfHeight : undefined}
                    PanelWidth={panelWidth}
                    PanelHeight={panelHeight}
                    focus={returnFalse}
                    ScreenToLocalTransform={this.docTransform}
                    docFilters={returnEmptyFilter}
                    searchFilterDocs={returnEmptyDoclist}
                    ContainingCollectionDoc={this.props.containingCollection}
                    ContainingCollectionView={undefined}
                    addDocument={returnFalse}
                    moveDocument={this.move}
                    removeDocument={this.props.removeDoc}
                    parentActive={this.props.active}
                    whenActiveChanged={this.props.whenActiveChanged}
                    addDocTab={this.props.addDocTab}
                    pinToPres={this.props.pinToPres}
                    bringToFront={returnFalse}
                    ContentScaling={returnOne}
                />
            </div>;
        }
    }

    get onCheckedClick() { return this.props.onCheckedClick?.() ?? ScriptCast(this.doc.onCheckedClick); }

    @action
    bulletClick = (e: React.MouseEvent) => {
        if (this.onCheckedClick && this.doc.type !== DocumentType.COL) {
            // this.props.document.treeViewChecked = this.props.document.treeViewChecked === "check" ? "x" : this.props.document.treeViewChecked === "x" ? undefined : "check";
            this.onCheckedClick?.script.run({
                this: this.doc.isTemplateForField && this.props.dataDoc ? this.props.dataDoc : this.doc,
                heading: this.props.containingCollection.title,
                checked: this.doc.treeViewChecked === "check" ? "x" : this.doc.treeViewChecked === "x" ? undefined : "check",
                containingTreeView: this.props.treeView.props.Document,
            }, console.log);
        } else {
            this.treeViewOpen = !this.treeViewOpen;
        }
        e.stopPropagation();
    }

    @computed get renderOutlineBullet() {
        TraceMobx();
        return <div className="outline-bullet"
            title={this.childDocs?.length ? `click to see ${this.childDocs?.length} items` : "view fields"}
            onClick={this.bulletClick}
            style={{ opacity: NumCast(this.doc.opacity, 1) }}>
            {(this.doc.text as RichTextField)?.Text ? <FontAwesomeIcon icon={this.childDocs?.length && !this.treeViewOpen ? ["fas", "circle"] : ["far", "circle"]} /> : (null)}
        </div>;
    }
    @computed get renderBullet() {
        TraceMobx();
        const checked = this.doc.type === DocumentType.COL ? undefined : this.onCheckedClick ? (this.doc.treeViewChecked ?? "unchecked") : undefined;
        return <div className="bullet"
            title={this.childDocs?.length ? `click to see ${this.childDocs?.length} items` : "view fields"}
            onClick={this.bulletClick}
            style={{
                color: StrCast(this.doc.color, checked === "unchecked" ? "white" : "inherit"),
                opacity: checked === "unchecked" ? undefined : 0.4
            }}>
            {<FontAwesomeIcon icon={checked === "check" ? "check" : (checked === "x" ? "times" : checked === "unchecked" ? "square" : !this.treeViewOpen ? (this.childDocs?.length ? "caret-square-right" : "caret-right") : (this.childDocs?.length ? "caret-square-down" : "caret-down"))} />}
        </div>;
    }

    showContextMenu = (e: React.MouseEvent) => {
        this._docRef.current?.ContentDiv && simulateMouseClick(this._docRef.current.ContentDiv, e.clientX, e.clientY + 30, e.screenX, e.screenY + 30);
    }
    contextMenuItems = () => Doc.IsSystem(this.doc) ? [] : [{ script: ScriptField.MakeFunction(`openOnRight(self)`)!, label: "Open" }, { script: ScriptField.MakeFunction(`DocFocus(self)`)!, label: "Focus" }];
    truncateTitleWidth = () => NumCast(this.props.treeView.props.Document.treeViewTruncateTitleWidth, 0);
    @computed get showTitleEdit() {
        return ["*", this._uniqueId, this.props.treeView._uniqueId].includes(Doc.GetT(this.doc, "editTitle", "string", true) || "");
    }
    onChildClick = () => this.props.onChildClick?.() ?? (this._editTitleScript?.() || ScriptCast(this.doc.treeChildClick));
    onChildDoubleClick = () => (!this.outlineMode && this._openScript?.()) || ScriptCast(this.doc.treeChildDoubleClick);
    /**
     * Renders the EditableView title element for placement into the tree.
     */
    @computed
    get renderTitle() {
        TraceMobx();
        const headerElements = this.props.treeViewHideHeaderFields() ? (null) :
            <>
                <FontAwesomeIcon key="bars" icon="bars" size="sm" onClick={e => { this.showContextMenu(e); e.stopPropagation(); }} />
                <span className="collectionTreeView-keyHeader" key={this.treeViewExpandedView}
                    onPointerDown={action(() => {
                        if (this.treeViewOpen) {
                            this.doc.treeViewExpandedView = this.treeViewLockExpandedView ? this.doc.treeViewExpandedView :
                                this.treeViewExpandedView === this.fieldKey ? (Doc.UserDoc().noviceMode || this.outlineMode ? "layout" : "fields") :
                                    this.treeViewExpandedView === "fields" && this.layoutDoc ? "layout" :
                                        this.treeViewExpandedView === "layout" && DocListCast(this.doc.links).length ? "links" :
                                            (this.treeViewExpandedView === "links" || this.treeViewExpandedView === "layout") && DocListCast(this.doc[this.fieldKey + "-annotations"]).length ? "annotations" :
                                                this.childDocs ? this.fieldKey : (Doc.UserDoc().noviceMode || this.outlineMode ? "layout" : "fields");
                        }
                        this.treeViewOpen = true;
                    })}>
                    {this.treeViewExpandedView}
                </span>
            </>;
        const view = this.showTitleEdit ? this.editableView("title") :
            <DocumentView
                ref={this._docRef}
                Document={this.doc}
                DataDoc={undefined}
                treeViewDoc={this.props.treeView.props.Document}
                LibraryPath={emptyPath}
                addDocument={undefined}
                addDocTab={this.props.addDocTab}
                rootSelected={returnTrue}
                pinToPres={emptyFunction}
                onClick={this.onChildClick}
                onDoubleClick={this.onChildDoubleClick}
                dropAction={this.props.dropAction}
                moveDocument={this.move}
                removeDocument={this.props.removeDoc}
                ScreenToLocalTransform={this.getTransform}
                ContentScaling={returnOne}
                PanelWidth={this.truncateTitleWidth}
                PanelHeight={returnZero}
                contextMenuItems={this.contextMenuItems}
                opacity={this.outlineMode ? undefined : returnOne}
                renderDepth={1}
                focus={returnTrue}
                parentActive={returnTrue}
                whenActiveChanged={this.props.whenActiveChanged}
                bringToFront={emptyFunction}
                dontRegisterView={BoolCast(this.props.treeView.props.Document.dontRegisterChildViews)}
                docFilters={returnEmptyFilter}
                searchFilterDocs={returnEmptyDoclist}
                ContainingCollectionView={undefined}
                ContainingCollectionDoc={this.props.containingCollection}
            />;
        return <>
            <div className={`docContainer${Doc.IsSystem(this.props.document) ? "-system" : ""}`} ref={this._tref} title="click to edit title" id={`docContainer-${this.props.parentKey}`}
                style={{
                    fontWeight: Doc.IsSearchMatch(this.doc) !== undefined ? "bold" : undefined,
                    textDecoration: Doc.GetT(this.doc, "title", "string", true) ? "underline" : undefined,
                    outline: this.doc === CurrentUserUtils.ActiveDashboard ? "dashed 1px #06123232" : undefined,
                    pointerEvents: !this.props.active() && !SnappingManager.GetIsDragging() ? "none" : undefined
                }} >
                {view}
            </div >
            {Doc.IsSystem(this.doc) && Doc.UserDoc().noviceMode ? (null) : headerElements}
        </>;
    }

    render() {
        TraceMobx();
        if (this.props.renderedIds.indexOf(this.doc[Id]) !== -1) return null;
        const sorting = this.doc[`${this.fieldKey}-sortAscending`];
        if (this.showTitleEdit) { // find  containing CollectionTreeView and set our maximum width so  the containing tree view won't have to scroll
            let par: any = this._header?.current;
            if (par) {
                while (par && par.className !== "collectionTreeView-dropTarget") par = par.parentNode;
                if (par) {
                    const par_rect = (par as HTMLElement).getBoundingClientRect();
                    const my_recct = this._docRef.current?.ContentDiv?.getBoundingClientRect();
                    this._editMaxWidth = Math.max(100, par_rect.right - (my_recct?.left || 0));
                }
            }
        } else this._editMaxWidth = "";
        return this.doc.treeViewHideTitle || (this.outlineMode) ?
            !StrCast(Doc.LayoutField(this.doc)).includes("CollectionView") ? this.renderContent :
                <div className="treeViewItem-container" ref={this.createTreeDropTarget} onPointerDown={e => this.props.active(true) && SelectionManager.DeselectAll()}
                    onKeyDown={e => {
                        e.stopPropagation();
                        e.key === "Backspace" && this.doc.text && !(this.doc.text as RichTextField)?.Text && UndoManager.RunInBatch(() => this.props.removeDoc?.(this.doc), "delete");
                        e.key === "Tab" && UndoManager.RunInBatch(() => e.shiftKey ? this.props.outdentDocument?.() : this.props.indentDocument?.(), "tab");
                        e.key === "Enter" && UndoManager.RunInBatch(() => this.makeTextCollection(), "bullet");
                        e.key === "Tab" && setTimeout(() => RichTextMenu.Instance.TextView?.EditorView?.focus(), 150);
                    }}
                >
                    <div className={`treeViewItem-header` + (this._editMaxWidth ? "-editing" : "")} ref={this._header} style={{ maxWidth: this._editMaxWidth }} onClick={e => {
                        if (this.props.active(true)) {
                            e.stopPropagation();
                            e.preventDefault();
                        }
                    }}
                        onPointerDown={e => {
                            if (this.props.active(true)) {
                                e.stopPropagation();
                                e.preventDefault();
                            }
                        }}
                        onPointerEnter={this.onPointerEnter} onPointerLeave={this.onPointerLeave}>
                        {this.outlineMode ? this.renderOutlineBullet : this.renderBullet}
                        <div ref={this._dref} style={{ display: "inline-block", height: this.rtfOutlineHeight() }} key={this.doc[Id]}>
                            <ContentFittingDocumentView
                                Document={this.doc}
                                DataDoc={undefined}
                                LayoutTemplateString={FormattedTextBox.LayoutString("text")}
                                LibraryPath={emptyPath}
                                renderDepth={this.props.renderDepth + 1}
                                rootSelected={returnTrue}
                                treeViewDoc={undefined}
                                backgroundColor={this.props.backgroundColor}
                                fitToBox={this.boundsOfCollectionDocument !== undefined}
                                PanelWidth={this.rtfWidth}
                                PanelHeight={this.rtfOutlineHeight}
                                focus={returnFalse}
                                ScreenToLocalTransform={this.docTransform}
                                docFilters={returnEmptyFilter}
                                searchFilterDocs={returnEmptyDoclist}
                                ContainingCollectionDoc={this.props.containingCollection}
                                ContainingCollectionView={undefined}
                                addDocument={this.props.addDocument}
                                moveDocument={this.move}
                                removeDocument={this.props.removeDoc}
                                parentActive={this.props.active}
                                whenActiveChanged={this.props.whenActiveChanged}
                                addDocTab={this.props.addDocTab}
                                pinToPres={this.props.pinToPres}
                                bringToFront={returnFalse}
                                ContentScaling={returnOne}
                            />
                        </div>
                    </div>

                    <div className={`treeViewItem-border${this.outlineMode ? "outline" : ""}`} style={{ borderColor: sorting === undefined ? undefined : sorting ? "crimson" : "blue" }}>
                        {!this.treeViewOpen ? (null) : this.renderContent}
                    </div>
                </div> :
            <div className="treeViewItem-container" ref={this.createTreeDropTarget} onPointerDown={e => this.props.active(true) && SelectionManager.DeselectAll()}>
                <li className="collection-child">
                    <div className={`treeViewItem-header` + (this._editMaxWidth ? "-editing" : "")} ref={this._header} style={{ maxWidth: this._editMaxWidth }} onClick={e => {
                        if (this.props.active(true)) {
                            e.stopPropagation();
                            e.preventDefault();
                            SelectionManager.DeselectAll();
                        }
                    }}
                        onPointerDown={e => {
                            if (this.props.active(true)) {
                                e.stopPropagation();
                                e.preventDefault();
                            }
                        }}
                        onPointerEnter={this.onPointerEnter} onPointerLeave={this.onPointerLeave}>
                        {this.outlineMode ? this.renderOutlineBullet : this.renderBullet}
                        {this.renderTitle}
                    </div>
                    <div className={`treeViewItem-border${this.outlineMode ? "outline" : ""}`} style={{ borderColor: sorting === undefined ? undefined : sorting ? "crimson" : "blue" }}>
                        {!this.treeViewOpen ? (null) : this.renderContent}
                    </div>
                </li>
            </div>;
    }
    public static GetChildElements(
        childDocs: Doc[],
        treeView: CollectionTreeView,
        containingCollection: Doc,
        dataDoc: Doc | undefined,
        key: string,
        parentCollectionDoc: Doc | undefined,
        parentPrevSibling: Doc | undefined,
        add: (doc: Doc | Doc[], relativeTo?: Doc, before?: boolean) => boolean,
        remove: ((doc: Doc | Doc[]) => boolean),
        move: DragManager.MoveFunction,
        dropAction: dropActionType,
        addDocTab: (doc: Doc, where: string) => boolean,
        pinToPres: (document: Doc) => void,
        backgroundColor: undefined | ((document: Doc, renderDepth: number) => string | undefined),
        screenToLocalXf: () => Transform,
        outerXf: () => { translateX: number, translateY: number },
        active: (outsideReaction?: boolean) => boolean,
        panelWidth: () => number,
        ChromeHeight: undefined | (() => number),
        renderDepth: number,
        treeViewHideHeaderFields: () => boolean,
        treeViewPreventOpen: boolean,
        renderedIds: string[],
        onCheckedClick: undefined | (() => ScriptField),
        onChildClick: undefined | (() => ScriptField),
        ignoreFields: string[] | undefined,
        firstLevel: boolean,
        whenActiveChanged: (isActive: boolean) => void
    ) {
        const viewSpecScript = Cast(containingCollection.viewSpecScript, ScriptField);
        if (viewSpecScript) {
            childDocs = childDocs.filter(d => viewSpecScript.script.run({ doc: d }, console.log).result);
        }

        const docs = childDocs.slice();
        const ascending = containingCollection?.[key + "-sortAscending"];
        if (ascending !== undefined) {
            const sortAlphaNum = (a: string, b: string): 0 | 1 | -1 => {
                const reN = /[0-9]*$/;
                const aA = a.replace(reN, ""); // get rid of trailing numbers
                const bA = b.replace(reN, "");
                if (aA === bA) {  // if header string matches, then compare numbers numerically
                    const aN = parseInt(a.match(reN)![0], 10);
                    const bN = parseInt(b.match(reN)![0], 10);
                    return aN === bN ? 0 : aN > bN ? 1 : -1;
                } else {
                    return aA > bA ? 1 : -1;
                }
            };
            docs.sort(function (a, b): 0 | 1 | -1 {
                const descA = ascending ? b : a;
                const descB = ascending ? a : b;
                const first = descA.title;
                const second = descB.title;
                // TODO find better way to sort how to sort..................
                if (typeof first === 'number' && typeof second === 'number') {
                    return (first - second) > 0 ? 1 : -1;
                }
                if (typeof first === 'string' && typeof second === 'string') {
                    return sortAlphaNum(first, second);
                }
                if (typeof first === 'boolean' && typeof second === 'boolean') {
                    // if (first === second) { // bugfixing?: otherwise, the list "flickers" because the list is resorted during every load
                    //     return Number(descA.x) > Number(descB.x) ? 1 : -1;
                    // }
                    return first > second ? 1 : -1;
                }
                return ascending ? 1 : -1;
            });
        }

        const rowWidth = () => panelWidth() - 20;
        return docs.map((child, i) => {
            const pair = Doc.GetLayoutDataDocPair(containingCollection, dataDoc, child);
            if (!pair.layout || pair.data instanceof Promise) {
                return (null);
            }

            const indent = i === 0 ? undefined : () => {
                if (remove && StrCast(docs[i - 1].layout).indexOf('fieldKey') !== -1) {
                    const fieldKeysub = StrCast(docs[i - 1].layout).split('fieldKey')[1];
                    const fieldKey = fieldKeysub.split("\'")[1];
                    if (fieldKey && Cast(docs[i - 1][fieldKey], listSpec(Doc)) !== undefined) {
                        remove(child);
                        FormattedTextBox.SelectOnLoad = child[Id];
                        Doc.AddDocToList(docs[i - 1], fieldKey, child);
                        docs[i - 1].treeViewOpen = true;
                        child.context = treeView.Document;
                    }
                }
            };
            const outdent = !parentCollectionDoc ? undefined : () => {
                if (remove && StrCast(parentCollectionDoc.layout).indexOf('fieldKey') !== -1) {
                    const fieldKeysub = StrCast(parentCollectionDoc.layout).split('fieldKey')[1];
                    const fieldKey = fieldKeysub.split("\'")[1];
                    remove(child);
                    FormattedTextBox.SelectOnLoad = child[Id];
                    Doc.AddDocToList(parentCollectionDoc, fieldKey, child, parentPrevSibling, false);
                    parentCollectionDoc.treeViewOpen = true;
                    child.context = treeView.Document;
                }
            };
            const addDocument = (doc: Doc | Doc[], relativeTo?: Doc, before?: boolean) => {
                return add(doc, relativeTo ?? docs[i], before !== undefined ? before : false);
            };
            const childLayout = Doc.Layout(pair.layout);
            const rowHeight = () => {
                const aspect = NumCast(childLayout._nativeWidth, 0) / NumCast(childLayout._nativeHeight, 0);
                return aspect ? Math.min(childLayout[WidthSym](), rowWidth()) / aspect : childLayout[HeightSym]();
            };
            return !(child instanceof Doc) ? (null) : <TreeView
                document={pair.layout}
                dataDoc={pair.data}
                containingCollection={containingCollection}
                prevSibling={docs[i]}
                treeView={treeView}
                key={child[Id]}
                indentDocument={indent}
                outdentDocument={outdent}
                onCheckedClick={onCheckedClick}
                onChildClick={onChildClick}
                renderDepth={renderDepth}
                removeDoc={StrCast(containingCollection.freezeChildren).includes("remove") ? undefined : remove}
                addDocument={addDocument}
                backgroundColor={backgroundColor}
                panelWidth={rowWidth}
                panelHeight={rowHeight}
                ChromeHeight={ChromeHeight}
                moveDocument={move}
                dropAction={dropAction}
                addDocTab={addDocTab}
                pinToPres={pinToPres}
                ScreenToLocalTransform={screenToLocalXf}
                outerXf={outerXf}
                parentKey={key}
                active={active}
                treeViewHideHeaderFields={treeViewHideHeaderFields}
                treeViewPreventOpen={treeViewPreventOpen}
                renderedIds={renderedIds}
                ignoreFields={ignoreFields}
                firstLevel={firstLevel}
                whenActiveChanged={whenActiveChanged} />;
        });
    }
}

export type collectionTreeViewProps = {
    treeViewHideTitle?: boolean;
    treeViewHideHeaderFields?: boolean;
    onCheckedClick?: () => ScriptField;
    onChildClick?: () => ScriptField;
};

@observer
export class CollectionTreeView extends CollectionSubView<Document, Partial<collectionTreeViewProps>>(Document) {
    private treedropDisposer?: DragManager.DragDropDisposer;
    private _mainEle?: HTMLDivElement;

    public _uniqueId = Utils.GenerateGuid();
    _isChildActive = false;
    @computed get doc() { return this.props.Document; }
    @computed get dataDoc() { return this.props.DataDoc || this.doc; }

    protected createTreeDropTarget = (ele: HTMLDivElement) => {
        this.treedropDisposer?.();
        if (this._mainEle = ele) {
            this.treedropDisposer = DragManager.MakeDropTarget(ele, this.onInternalDrop.bind(this), this.doc, this.onInternalPreDrop.bind(this));
        }
    }

    protected onInternalPreDrop = (e: Event, de: DragManager.DropEvent, targetAction: dropActionType) => {
        const dragData = de.complete.docDragData;
        if (dragData) {
            if (targetAction && !dragData.draggedDocuments.some(d => d.context === this.doc && this.childDocs.includes(d))) {
                dragData.dropAction = targetAction;
            } else dragData.dropAction = this.doc === dragData?.treeViewDoc ? "same" : dragData.dropAction;
        }
    }

    componentWillUnmount() {
        super.componentWillUnmount();
        this.treedropDisposer?.();
    }

    @action
    remove = (doc: Doc | Doc[]): boolean => {
        const docs = doc instanceof Doc ? [doc] : doc;
        const targetDataDoc = this.doc[DataSym];
        const value = DocListCast(targetDataDoc[this.props.fieldKey]);
        const result = value.filter(v => !docs.includes(v));
        SelectionManager.DeselectAll();
        if (result.length !== value.length) {
            targetDataDoc[this.props.fieldKey] = new List<Doc>(result);
            return true;
        }
        return false;
    }
    @action
    addDoc = (doc: Doc | Doc[], relativeTo: Opt<Doc>, before?: boolean): boolean => {
        const doAddDoc = (doc: Doc | Doc[]) =>
            (doc instanceof Doc ? [doc] : doc).reduce((flg, doc) =>
                flg && Doc.AddDocToList(this.doc[DataSym], this.props.fieldKey, doc, relativeTo, before, false, false, false), true);
        if (this.doc.resolvedDataDoc instanceof Promise) {
            this.doc.resolvedDataDoc.then((resolved: any) => doAddDoc(doc));
        } else if (relativeTo === undefined) {
            this.props.addDocument(doc);
        } else {
            doAddDoc(doc);
            (doc instanceof Doc ? [doc] : doc).forEach(d => d.context = this.props.Document);
        }
        return true;
    }
    onContextMenu = (e: React.MouseEvent): void => {
        // need to test if propagation has stopped because GoldenLayout forces a parallel react hierarchy to be created for its top-level layout
        if (!e.isPropagationStopped() && this.doc === CurrentUserUtils.MyDashboards) {
            ContextMenu.Instance.addItem({ description: "Create Dashboard", event: () => CurrentUserUtils.createNewDashboard(Doc.UserDoc()), icon: "plus" });
            ContextMenu.Instance.addItem({ description: "Delete Dashboard", event: () => this.remove(this.doc), icon: "minus" });
            e.stopPropagation();
            e.preventDefault();
            ContextMenu.Instance.displayMenu(e.pageX - 15, e.pageY - 15);
        } else if (!e.isPropagationStopped() && this.doc === Doc.UserDoc().myRecentlyClosedDocs) {
            ContextMenu.Instance.addItem({ description: "Clear All", event: () => Doc.UserDoc().myRecentlyClosedDocs = new List<Doc>(), icon: "plus" });
            e.stopPropagation();
            e.preventDefault();
            ContextMenu.Instance.displayMenu(e.pageX - 15, e.pageY - 15);
        } else {
            const layoutItems: ContextMenuProps[] = [];
            layoutItems.push({ description: (this.doc.treeViewPreventOpen ? "Persist" : "Abandon") + "Treeview State", event: () => this.doc.treeViewPreventOpen = !this.doc.treeViewPreventOpen, icon: "paint-brush" });
            layoutItems.push({ description: (this.doc.treeViewHideHeaderFields ? "Show" : "Hide") + " Header Fields", event: () => this.doc.treeViewHideHeaderFields = !this.doc.treeViewHideHeaderFields, icon: "paint-brush" });
            layoutItems.push({ description: (this.doc.treeViewHideTitle ? "Show" : "Hide") + " Title", event: () => this.doc.treeViewHideTitle = !this.doc.treeViewHideTitle, icon: "paint-brush" });
            layoutItems.push({ description: (this.doc.treeViewHideLinkLines ? "Show" : "Hide") + " Link Lines", event: () => this.doc.treeViewHideLinkLines = !this.doc.treeViewHideLinkLines, icon: "paint-brush" });
            ContextMenu.Instance.addItem({ description: "Options...", subitems: layoutItems, icon: "eye" });
        }
        const existingOnClick = ContextMenu.Instance.findByDescription("OnClick...");
        const onClicks: ContextMenuProps[] = existingOnClick && "subitems" in existingOnClick ? existingOnClick.subitems : [];
        onClicks.push({
            description: "Edit onChecked Script", event: () => UndoManager.RunInBatch(() => DocUtils.makeCustomViewClicked(this.doc, undefined, "onCheckedClick"), "edit onCheckedClick"), icon: "edit"
        });
        onClicks.push({
            description: `${this.props.Document.treeViewOutlineMode ? "Delay " : "Immediate "} Title Editing`, event: () => UndoManager.RunInBatch(() => this.props.Document.treeViewOutlineMode = !this.props.Document.treeViewOutlineMode, "edit onCheckedClick"), icon: "edit"
        });
        !existingOnClick && ContextMenu.Instance.addItem({ description: "OnClick...", noexpand: true, subitems: onClicks, icon: "mouse-pointer" });
    }
    outerXf = () => Utils.GetScreenTransform(this._mainEle!);
    onTreeDrop = (e: React.DragEvent) => this.onExternalDrop(e, {});

    @computed get renderClearButton() {
        return <div id="toolbar" key="toolbar">
            <button className="toolbar-button round-button" title="Empty"
                onClick={undoBatch(action(() => Doc.GetProto(this.doc)[this.props.fieldKey] = undefined))}>
                <FontAwesomeIcon icon={"trash"} size="sm" />
            </button>
        </div >;
    }

    @undoBatch
    makeTextCollection = action((childDocs: Doc[]) => {
        Doc.SetInPlace(this.doc, "editTitle", undefined, false);
        const bullet = TreeView.makeTextBullet();
        bullet.context = this.doc;
        this.addDoc(bullet, childDocs.length ? childDocs[0] : undefined, true);
        setTimeout(() => RichTextMenu.Instance.TextView?.EditorView?.focus(), 150);
    })

    editableTitle(childDocs: Doc[]) {
        return <EditableView
            contents={this.dataDoc.title}
            editing={false}
            display={"block"}
            maxHeight={72}
            height={"auto"}
            GetValue={() => StrCast(this.dataDoc.title)}
            SetValue={undoBatch((value: string, shift: boolean, enter: boolean) => {
                if (this.props.Document.treeViewOutlineMode && enter) {
                    this.makeTextCollection(childDocs)
                }
                return Doc.SetInPlace(this.dataDoc, "title", value, false);
            })} />;
    }


    rtfWidth = () => Math.min(this.layoutDoc?.[WidthSym](), this.props.PanelWidth() - 20);
    rtfOutlineHeight = () => Math.min(this.layoutDoc?.[HeightSym](), (StrCast(this.layoutDoc?._fontSize) ? Number(StrCast(this.layoutDoc?._fontSize, "32px").replace("px", "")) : NumCast(this.layoutDoc?._fontSize)) * 2);
    titleTransform = () => this.props.ScreenToLocalTransform().translate(-NumCast(this.doc._xPadding, 10), -NumCast(this.doc._yPadding, 20));
    documentTitle = (childDocs: Doc[]) => {
        return <div style={{ display: "inline-block", height: this.rtfOutlineHeight() }} key={this.doc[Id]}
            onKeyDown={e => {
                e.stopPropagation();
                e.key === "Enter" && this.makeTextCollection(childDocs)
            }}>
            <ContentFittingDocumentView
                Document={this.doc}
                DataDoc={undefined}
                LayoutTemplateString={FormattedTextBox.LayoutString("text")}
                LibraryPath={emptyPath}
                renderDepth={this.props.renderDepth + 1}
                rootSelected={returnTrue}
                treeViewDoc={undefined}
                dontRegisterView={true}
                backgroundColor={this.props.backgroundColor}
                PanelWidth={this.rtfWidth}
                PanelHeight={this.rtfOutlineHeight}
                focus={returnFalse}
                ScreenToLocalTransform={this.titleTransform}
                docFilters={returnEmptyFilter}
                searchFilterDocs={returnEmptyDoclist}
                ContainingCollectionDoc={this.doc}
                ContainingCollectionView={this.props.CollectionView}
                addDocument={this.props.addDocument}
                moveDocument={returnFalse}
                removeDocument={returnFalse}
                parentActive={this.props.active}
                whenActiveChanged={this.props.whenActiveChanged}
                addDocTab={this.props.addDocTab}
                pinToPres={this.props.pinToPres}
                bringToFront={returnFalse}
                ContentScaling={returnOne}
            />
        </div>
    }

    onChildClick = () => { return this.props.onChildClick?.() || ScriptCast(this.doc.onChildClick); }
    whenActiveChanged = (isActive: boolean) => { this.props.whenActiveChanged(this._isChildActive = isActive); }
    active = (outsideReaction: boolean | undefined) => this.props.active(outsideReaction) || this._isChildActive;
    render() {
        TraceMobx();
        if (!(this.doc instanceof Doc)) return (null);
        const dropAction = StrCast(this.doc.childDropAction) as dropActionType;
        const addDoc = (doc: Doc | Doc[], relativeTo?: Doc, before?: boolean) => this.addDoc(doc, relativeTo, before);
        const moveDoc = (d: Doc | Doc[], target: Doc | undefined, addDoc: (doc: Doc | Doc[]) => boolean) => this.props.moveDocument(d, target, addDoc);
        const childDocs = this.props.overrideDocuments ? this.props.overrideDocuments : this.childDocs;
        const childElements = childDocs && TreeView.GetChildElements(childDocs, this, this.doc, this.props.DataDoc, this.props.fieldKey, this.props.ContainingCollectionDoc, undefined, addDoc, this.remove,
            moveDoc, dropAction, this.props.addDocTab, this.props.pinToPres, this.props.backgroundColor, this.props.ScreenToLocalTransform,
            this.outerXf, this.active, this.props.PanelWidth, this.props.ChromeHeight, this.props.renderDepth, () => this.props.treeViewHideHeaderFields || BoolCast(this.doc.treeViewHideHeaderFields),
            BoolCast(this.doc.treeViewPreventOpen), [], this.props.onCheckedClick,
            this.onChildClick, this.props.ignoreFields, true, this.whenActiveChanged);
        const hideTitle = this.props.treeViewHideTitle || this.doc.treeViewHideTitle;
        const backgroundColor = StrCast(this.layoutDoc._backgroundColor) || StrCast(this.layoutDoc.backgroundColor) || StrCast(this.doc.backgroundColor) || this.props.backgroundColor?.(this.doc, this.props.renderDepth);

        return !childDocs ? (null) : (
            <div className="collectionTreeView-container" onContextMenu={this.onContextMenu}>
                <div className="collectionTreeView-dropTarget" id="body"
                    style={{
                        background: backgroundColor,
                        paddingLeft: `${NumCast(this.doc._xPadding, 10)}px`,
                        paddingRight: `${NumCast(this.doc._xPadding, 10)}px`,
                        paddingTop: `${NumCast(this.doc._yPadding, 20)}px`,
                        pointerEvents: !this.props.active() && !SnappingManager.GetIsDragging() && !this._isChildActive ? "none" : undefined,
                    }}
                    onWheel={(e) => this._mainEle && this._mainEle.scrollHeight > this._mainEle.clientHeight && e.stopPropagation()}
                    onDrop={this.onTreeDrop}
                    ref={this.createTreeDropTarget}>
                    {hideTitle ? (null) : (this.doc.treeViewOutlineMode ? this.documentTitle : this.editableTitle)(childDocs)}
                    {this.doc.allowClear ? this.renderClearButton : (null)}
                    <ul className="no-indent" style={{ width: "max-content" }} > {childElements} </ul>
                </div >
            </div>
        );
    }
}

Scripting.addGlobal(function determineCheckedState(layoutDoc: Doc, facetHeader: string, facetValue: string) {
    const docFilters = Cast(layoutDoc._docFilters, listSpec("string"), []);
    for (let i = 0; i < docFilters.length; i += 3) {
        const [header, value, state] = docFilters.slice(i, i + 3);
        if (header === facetHeader && value === facetValue) {
            return state;
        }
    }
    return undefined;
});