import { IconName, library } from '@fortawesome/fontawesome-svg-core';
import { faFilePdf, faFilm, faFont, faGlobeAsia, faImage, faMusic, faObjectGroup, faPenNib, faRedoAlt, faTable, faTree, faUndoAlt } from '@fortawesome/free-solid-svg-icons';
import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
import { action, computed, configure, observable, runInAction } from 'mobx';
import { observer } from 'mobx-react';
import "normalize.css";
import * as React from 'react';
import * as ReactDOM from 'react-dom';
import Measure from 'react-measure';
import * as request from 'request';
import { Document } from '../../fields/Document';
import { Field, FieldWaiting, Opt, FIELD_WAITING } from '../../fields/Field';
import { KeyStore } from '../../fields/KeyStore';
import { ListField } from '../../fields/ListField';
import { WorkspacesMenu } from '../../server/authentication/controllers/WorkspacesMenu';
import { CurrentUserUtils } from '../../server/authentication/models/current_user_utils';
import { MessageStore } from '../../server/Message';
import { RouteStore } from '../../server/RouteStore';
import { ServerUtils } from '../../server/ServerUtil';
import { emptyDocFunction, emptyFunction, returnTrue, Utils, returnOne } from '../../Utils';
import { Documents } from '../documents/Documents';
import { ColumnAttributeModel } from '../northstar/core/attribute/AttributeModel';
import { AttributeTransformationModel } from '../northstar/core/attribute/AttributeTransformationModel';
import { Gateway, NorthstarSettings } from '../northstar/manager/Gateway';
import { AggregateFunction, Catalog } from '../northstar/model/idea/idea';
import '../northstar/model/ModelExtensions';
import { HistogramOperation } from '../northstar/operations/HistogramOperation';
import '../northstar/utils/Extensions';
import { Server } from '../Server';
import { SetupDrag, DragManager } from '../util/DragManager';
import { Transform } from '../util/Transform';
import { UndoManager } from '../util/UndoManager';
import { CollectionDockingView } from './collections/CollectionDockingView';
import { ContextMenu } from './ContextMenu';
import { DocumentDecorations } from './DocumentDecorations';
import { InkingControl } from './InkingControl';
import "./Main.scss";
import { MainOverlayTextBox } from './MainOverlayTextBox';
import { DocumentView } from './nodes/DocumentView';
import { PreviewCursor } from './PreviewCursor';
import { SelectionManager } from '../util/SelectionManager';


@observer
export class Main extends React.Component {
    public static Instance: Main;
    @observable private _workspacesShown: boolean = false;
    @observable public pwidth: number = 0;
    @observable public pheight: number = 0;

    @computed private get mainContainer(): Document | undefined | FIELD_WAITING {
        return CurrentUserUtils.UserDocument.GetT(KeyStore.ActiveWorkspace, Document);
    }
    private set mainContainer(doc: Document | undefined | FIELD_WAITING) {
        doc && CurrentUserUtils.UserDocument.Set(KeyStore.ActiveWorkspace, doc);
    }

    constructor(props: Readonly<{}>) {
        super(props);
        Main.Instance = this;
        // causes errors to be generated when modifying an observable outside of an action
        configure({ enforceActions: "observed" });
        if (window.location.pathname !== RouteStore.home) {
            let pathname = window.location.pathname.split("/");
            if (pathname.length > 1 && pathname[pathname.length - 2] === 'doc') {
                CurrentUserUtils.MainDocId = pathname[pathname.length - 1];
            }
        }

        CurrentUserUtils.loadCurrentUser();

        library.add(faFont);
        library.add(faImage);
        library.add(faFilePdf);
        library.add(faObjectGroup);
        library.add(faTable);
        library.add(faGlobeAsia);
        library.add(faUndoAlt);
        library.add(faRedoAlt);
        library.add(faPenNib);
        library.add(faFilm);
        library.add(faMusic);
        library.add(faTree);

        this.initEventListeners();
        this.initAuthenticationRouters();

        try {
            this.initializeNorthstar();
        } catch (e) {

        }
    }

    componentDidMount() { window.onpopstate = this.onHistory; }

    componentWillUnmount() { window.onpopstate = null; }

    onHistory = () => {
        if (window.location.pathname !== RouteStore.home) {
            let pathname = window.location.pathname.split("/");
            CurrentUserUtils.MainDocId = pathname[pathname.length - 1];
            Server.GetField(CurrentUserUtils.MainDocId, action((field: Opt<Field>) => {
                if (field instanceof Document) {
                    this.openWorkspace(field, true);
                }
            }));
        }
    }

    initEventListeners = () => {
        // window.addEventListener("pointermove", (e) => this.reportLocation(e))
        window.addEventListener("drop", (e) => e.preventDefault(), false); // drop event handler
        window.addEventListener("dragover", (e) => e.preventDefault(), false); // drag event handler
        window.addEventListener("keydown", (e) => {
            if (e.key == "Escape") {
                DragManager.AbortDrag();
                SelectionManager.DeselectAll()
            }
        }, false); // drag event handler
        // click interactions for the context menu
        document.addEventListener("pointerdown", action(function (e: PointerEvent) {
            if (!ContextMenu.Instance.intersects(e.pageX, e.pageY)) {
                ContextMenu.Instance.clearItems();
            }
        }), true);
    }

    initAuthenticationRouters = () => {
        // Load the user's active workspace, or create a new one if initial session after signup
        if (!CurrentUserUtils.MainDocId) {
            CurrentUserUtils.UserDocument.GetTAsync(KeyStore.ActiveWorkspace, Document).then(doc => {
                if (doc) {
                    CurrentUserUtils.MainDocId = doc.Id;
                    this.openWorkspace(doc);
                } else {
                    this.createNewWorkspace();
                }
            });
        } else {
            Server.GetField(CurrentUserUtils.MainDocId).then(field =>
                field instanceof Document ? this.openWorkspace(field) :
                    this.createNewWorkspace(CurrentUserUtils.MainDocId));
        }
    }

    @action
    createNewWorkspace = (id?: string): void => {
        CurrentUserUtils.UserDocument.GetTAsync<ListField<Document>>(KeyStore.Workspaces, ListField).then(action((list: Opt<ListField<Document>>) => {
            if (list) {
                let freeformDoc = Documents.FreeformDocument([], { x: 0, y: 400, title: "mini collection" });
                var dockingLayout = { content: [{ type: 'row', content: [CollectionDockingView.makeDocumentConfig(freeformDoc)] }] };
                let mainDoc = Documents.DockDocument(JSON.stringify(dockingLayout), { title: `Main Container ${list.Data.length + 1}` }, id);
                list.Data.push(mainDoc);
                CurrentUserUtils.MainDocId = mainDoc.Id;
                // bcz: strangely, we need a timeout to prevent exceptions/issues initializing GoldenLayout (the rendering engine for Main Container)
                setTimeout(() => {
                    this.openWorkspace(mainDoc);
                    let pendingDocument = Documents.SchemaDocument([], { title: "New Mobile Uploads" });
                    mainDoc.Set(KeyStore.OptionalRightCollection, pendingDocument);
                }, 0);
            }
        }));
    }

    @action
    openWorkspace = (doc: Document, fromHistory = false): void => {
        this.mainContainer = doc;
        fromHistory || window.history.pushState(null, doc.Title, "/doc/" + doc.Id);
        CurrentUserUtils.UserDocument.GetTAsync(KeyStore.OptionalRightCollection, Document).then(col =>
            // if there is a pending doc, and it has new data, show it (syip: we use a timeout to prevent collection docking view from being uninitialized)
            setTimeout(() =>
                col && col.GetTAsync<ListField<Document>>(KeyStore.Data, ListField, (f: Opt<ListField<Document>>) =>
                    f && f.Data.length > 0 && CollectionDockingView.Instance.AddRightSplit(col))
                , 100)
        );
    }

    @computed
    get mainContent() {
        let pwidthFunc = () => this.pwidth;
        let pheightFunc = () => this.pheight;
        let noScaling = () => 1;
        let mainCont = this.mainContainer;
        return <Measure onResize={action((r: any) => { this.pwidth = r.entry.width; this.pheight = r.entry.height; })}>
            {({ measureRef }) =>
                <div ref={measureRef} id="mainContent-div">
                    {!mainCont ? (null) :
                        <DocumentView Document={mainCont}
                            addDocument={undefined}
                            removeDocument={undefined}
                            ScreenToLocalTransform={Transform.Identity}
                            ContentScaling={noScaling}
                            PanelWidth={pwidthFunc}
                            PanelHeight={pheightFunc}
                            isTopMost={true}
                            selectOnLoad={false}
                            focus={emptyDocFunction}
                            parentActive={returnTrue}
                            whenActiveChanged={emptyFunction}
                            ContainingCollectionView={undefined} />}
                </div>
            }
        </Measure>;
    }

    /* for the expandable add nodes menu. Not included with the miscbuttons because once it expands it expands the whole div with it, making canvas interactions limited. */
    @computed
    get nodesMenu() {
        let imgurl = "https://upload.wikimedia.org/wikipedia/commons/thumb/3/3a/Cat03.jpg/1200px-Cat03.jpg";
        let pdfurl = "http://www.adobe.com/support/products/enterprise/knowledgecenter/media/c27211_sample_explain.pdf";
        let weburl = "https://cs.brown.edu/courses/cs166/";
        let audiourl = "http://techslides.com/demos/samples/sample.mp3";
        let videourl = "http://techslides.com/demos/sample-videos/small.mp4";

        let addTextNode = action(() => Documents.TextDocument({ width: 200, height: 200, title: "a text note" }));
        let addColNode = action(() => Documents.FreeformDocument([], { width: 200, height: 200, title: "a freeform collection" }));
        let addSchemaNode = action(() => Documents.SchemaDocument([], { width: 200, height: 200, title: "a schema collection" }));
        let addTreeNode = action(() => Documents.TreeDocument(this._northstarSchemas, { width: 250, height: 400, title: "northstar schemas", copyDraggedItems: true }));
        let addVideoNode = action(() => Documents.VideoDocument(videourl, { width: 200, title: "video node" }));
        let addPDFNode = action(() => Documents.PdfDocument(pdfurl, { width: 200, height: 200, title: "a pdf doc" }));
        let addImageNode = action(() => Documents.ImageDocument(imgurl, { width: 200, title: "an image of a cat" }));
        let addWebNode = action(() => Documents.WebDocument(weburl, { width: 200, height: 200, title: "a sample web page" }));
        let addAudioNode = action(() => Documents.AudioDocument(audiourl, { width: 200, height: 200, title: "audio node" }));

        let btns: [React.RefObject<HTMLDivElement>, IconName, string, () => Document][] = [
            [React.createRef<HTMLDivElement>(), "font", "Add Textbox", addTextNode],
            [React.createRef<HTMLDivElement>(), "image", "Add Image", addImageNode],
            [React.createRef<HTMLDivElement>(), "file-pdf", "Add PDF", addPDFNode],
            [React.createRef<HTMLDivElement>(), "film", "Add Video", addVideoNode],
            [React.createRef<HTMLDivElement>(), "music", "Add Audio", addAudioNode],
            [React.createRef<HTMLDivElement>(), "globe-asia", "Add Web Clipping", addWebNode],
            [React.createRef<HTMLDivElement>(), "object-group", "Add Collection", addColNode],
            [React.createRef<HTMLDivElement>(), "tree", "Add Tree", addTreeNode],
            [React.createRef<HTMLDivElement>(), "table", "Add Schema", addSchemaNode],
        ];

        return < div id="add-nodes-menu" >
            <input type="checkbox" id="add-menu-toggle" />
            <label htmlFor="add-menu-toggle" title="Add Node"><p>+</p></label>

            <div id="add-options-content">
                <ul id="add-options-list">
                    {btns.map(btn =>
                        <li key={btn[1]} ><div ref={btn[0]}>
                            <button className="round-button add-button" title={btn[2]} onPointerDown={SetupDrag(btn[0], btn[3])}>
                                <FontAwesomeIcon icon={btn[1]} size="sm" />
                            </button>
                        </div></li>)}
                </ul>
            </div>
        </div >;
    }

    /* @TODO this should really be moved into a moveable toolbar component, but for now let's put it here to meet the deadline */
    @computed
    get miscButtons() {
        let workspacesRef = React.createRef<HTMLDivElement>();
        let logoutRef = React.createRef<HTMLDivElement>();
        let toggleWorkspaces = () => runInAction(() => this._workspacesShown = !this._workspacesShown);

        let clearDatabase = action(() => Utils.Emit(Server.Socket, MessageStore.DeleteAll, {}));
        return [
            <button className="clear-db-button" key="clear-db" onClick={clearDatabase}>Clear Database</button>,
            <div id="toolbar" key="toolbar">
                <button className="toolbar-button round-button" title="Undo" onClick={() => UndoManager.Undo()}><FontAwesomeIcon icon="undo-alt" size="sm" /></button>
                <button className="toolbar-button round-button" title="Redo" onClick={() => UndoManager.Redo()}><FontAwesomeIcon icon="redo-alt" size="sm" /></button>
                <button className="toolbar-button round-button" title="Ink" onClick={() => InkingControl.Instance.toggleDisplay()}><FontAwesomeIcon icon="pen-nib" size="sm" /></button>
            </div >,
            <div className="main-buttonDiv" key="workspaces" style={{ top: '34px', left: '2px', position: 'absolute' }} ref={workspacesRef}>
                <button onClick={toggleWorkspaces}>Workspaces</button></div>,
            <div className="main-buttonDiv" key="logout" style={{ top: '34px', right: '1px', position: 'absolute' }} ref={logoutRef}>
                <button onClick={() => request.get(ServerUtils.prepend(RouteStore.logout), emptyFunction)}>Log Out</button></div>
        ];
    }

    @computed
    get workspaceMenu() {
        let areWorkspacesShown = () => this._workspacesShown;
        let toggleWorkspaces = () => runInAction(() => this._workspacesShown = !this._workspacesShown);
        let workspaces = CurrentUserUtils.UserDocument.GetT<ListField<Document>>(KeyStore.Workspaces, ListField);
        return (!workspaces || workspaces === FieldWaiting || this.mainContainer === FieldWaiting) ? (null) :
            <WorkspacesMenu active={this.mainContainer} open={this.openWorkspace}
                new={this.createNewWorkspace} allWorkspaces={workspaces.Data}
                isShown={areWorkspacesShown} toggle={toggleWorkspaces} />;
    }

    render() {
        return (
            <div id="main-div">
                <DocumentDecorations />
                {this.mainContent}
                <PreviewCursor />
                <ContextMenu />
                {this.nodesMenu}
                {this.miscButtons}
                {this.workspaceMenu}
                <InkingControl />
                <MainOverlayTextBox />
            </div>
        );
    }

    // --------------- Northstar hooks ------------- /
    private _northstarSchemas: Document[] = [];

    @action SetNorthstarCatalog(ctlog: Catalog) {
        CurrentUserUtils.NorthstarDBCatalog = ctlog;
        if (ctlog && ctlog.schemas) {
            ctlog.schemas.map(schema => {
                let schemaDocuments: Document[] = [];
                let attributesToBecomeDocs = CurrentUserUtils.GetAllNorthstarColumnAttributes(schema);
                Promise.all(attributesToBecomeDocs.reduce((promises, attr) => {
                    promises.push(Server.GetField(attr.displayName! + ".alias").then(action((field: Opt<Field>) => {
                        if (field instanceof Document) {
                            schemaDocuments.push(field);
                        } else {
                            var atmod = new ColumnAttributeModel(attr);
                            let histoOp = new HistogramOperation(schema.displayName!,
                                new AttributeTransformationModel(atmod, AggregateFunction.None),
                                new AttributeTransformationModel(atmod, AggregateFunction.Count),
                                new AttributeTransformationModel(atmod, AggregateFunction.Count));
                            schemaDocuments.push(Documents.HistogramDocument(histoOp, { width: 200, height: 200, title: attr.displayName! }, undefined, attr.displayName! + ".alias"));
                        }
                    })));
                    return promises;
                }, [] as Promise<void>[])).finally(() =>
                    this._northstarSchemas.push(Documents.TreeDocument(schemaDocuments, { width: 50, height: 100, title: schema.displayName! })));
            });
        }
    }
    async initializeNorthstar(): Promise<void> {
        const getEnvironment = await fetch("/assets/env.json", { redirect: "follow", method: "GET", credentials: "include" });
        NorthstarSettings.Instance.UpdateEnvironment(await getEnvironment.json());
        Gateway.Instance.ClearCatalog().then(async () => this.SetNorthstarCatalog(await Gateway.Instance.GetCatalog()));
    }
}

(async () => {
    await Documents.initProtos();
    await CurrentUserUtils.loadCurrentUser();
    ReactDOM.render(<Main />, document.getElementById('root'));
})();