import * as fitCurve from 'fit-curve';
import { action, computed, makeObservable, observable, runInAction } from 'mobx';
import { observer } from 'mobx-react';
import * as React from 'react';
import { returnEmptyFilter, returnEmptyString, returnFalse, setupMoveUpEvents } from '../../ClientUtils';
import { emptyFunction } from '../../Utils';
import { Doc, Opt, returnEmptyDoclist } from '../../fields/Doc';
import { InkData, InkField, InkTool } from '../../fields/InkField';
import { NumCast } from '../../fields/Types';
import {
    ActiveArrowEnd,
    ActiveArrowScale,
    ActiveArrowStart,
    ActiveDash,
    ActiveInkBezierApprox,
    ActiveInkColor,
    ActiveInkWidth,
    SetActiveArrowStart,
    SetActiveDash,
    SetActiveFillColor,
    SetActiveInkColor,
    SetActiveInkWidth,
} from './nodes/DocumentView';
import { Gestures } from '../../pen-gestures/GestureTypes';
import { GestureUtils } from '../../pen-gestures/GestureUtils';
import { InteractionUtils } from '../util/InteractionUtils';
import { ScriptingGlobals } from '../util/ScriptingGlobals';
import { Transform } from '../util/Transform';
import './GestureOverlay.scss';
import { ObservableReactComponent } from './ObservableReactComponent';
import { returnEmptyDocViewList } from './StyleProvider';
import { ActiveFillColor, DocumentView } from './nodes/DocumentView';

export enum ToolglassTools {
    InkToText = 'inktotext',
    IgnoreGesture = 'ignoregesture',
    RadialMenu = 'radialmenu',
    None = 'none',
}
interface GestureOverlayProps {
    isActive: boolean;
}
@observer
export class GestureOverlay extends ObservableReactComponent<React.PropsWithChildren<GestureOverlayProps>> {
    // eslint-disable-next-line no-use-before-define
    static Instance: GestureOverlay;
    // eslint-disable-next-line no-use-before-define
    static Instances: GestureOverlay[] = [];

    @observable public InkShape: Opt<Gestures> = undefined;
    @observable public SavedColor?: string = undefined;
    @observable public SavedWidth?: number = undefined;
    @observable public Tool: ToolglassTools = ToolglassTools.None;
    @observable public KeepPrimitiveMode = false; // for whether primitive selection enters a one-shot or persistent mode

    @observable private _thumbX?: number = undefined;
    @observable private _thumbY?: number = undefined;
    @observable private _pointerY?: number = undefined;
    @observable private _points: { X: number; Y: number }[] = [];
    @observable private _strokes: InkData[] = [];
    @observable private _palette?: JSX.Element = undefined;
    @observable private _clipboardDoc?: JSX.Element = undefined;
    @observable private _possibilities: JSX.Element[] = [];

    @computed private get height(): number {
        return 2 * Math.max(this._pointerY && this._thumbY ? this._thumbY - this._pointerY : 100, 100);
    }
    @computed private get showBounds() {
        return this.Tool !== ToolglassTools.None;
    }

    private _overlayRef = React.createRef<HTMLDivElement>();
    private _d1: Doc | undefined;
    private _inkToTextDoc: Doc | undefined;
    private thumbIdentifier?: number;
    private pointerIdentifier?: number;

    constructor(props: GestureOverlayProps) {
        super(props);
        makeObservable(this);
        GestureOverlay.Instances.push(this);
    }

    componentWillUnmount() {
        GestureOverlay.Instances.splice(GestureOverlay.Instances.indexOf(this), 1);
        GestureOverlay.Instance = GestureOverlay.Instances.lastElement();
    }
    componentDidMount() {
        GestureOverlay.Instance = this;
    }

    @action
    onPointerDown = (e: React.PointerEvent) => {
        if (!(e.target as HTMLElement)?.className?.toString().startsWith('lm_')) {
            if ([InkTool.Highlighter, InkTool.Pen, InkTool.Write].includes(Doc.ActiveTool)) {
                this._points.push({ X: e.clientX, Y: e.clientY });
                setupMoveUpEvents(this, e, this.onPointerMove, this.onPointerUp, emptyFunction);
            }
        }
    };

    @action
    onPointerMove = (e: PointerEvent) => {
        this._points.push({ X: e.clientX, Y: e.clientY });

        if (this._points.length > 1) {
            const initialPoint = this._points[0];
            const xInGlass = initialPoint.X > (this._thumbX ?? Number.MAX_SAFE_INTEGER) && initialPoint.X < (this._thumbX ?? Number.MAX_SAFE_INTEGER) + this.height;
            const yInGlass = initialPoint.Y > (this._thumbY ?? Number.MAX_SAFE_INTEGER) - this.height && initialPoint.Y < (this._thumbY ?? Number.MAX_SAFE_INTEGER);
            if (this.Tool !== ToolglassTools.None && xInGlass && yInGlass) {
                switch (this.Tool) {
                    case ToolglassTools.RadialMenu: return true;
                    default: 
                } // prettier-ignore
            }
        }
        return false;
    };

    @action primCreated() {
        if (!this.KeepPrimitiveMode) {
            this.InkShape = undefined;
            // get out of ink mode after each stroke=
            // if (Doc.ActiveTool === InkTool.Highlighter && GestureOverlay.Instance.SavedColor) SetActiveInkColor(GestureOverlay.Instance.SavedColor);
            Doc.ActiveTool = InkTool.None;
            // SetActiveArrowStart('none');
            // SetActiveArrowEnd('none');
        }
    }
    @action
    onPointerUp = () => {
        DocumentView.DownDocView = undefined;
        if (this._points.length > 1) {
            const B = this.svgBounds;
            const points = this._points.map(p => ({ X: p.X - B.left, Y: p.Y - B.top }));

            // if any of the shape is activated in the CollectionFreeFormViewChrome
            if (this.InkShape) {
                GestureOverlay.makeBezierPolygon(this._points, this.InkShape, false);
                this.dispatchGesture(this.InkShape);
                this.primCreated();
            }
            // if we're not drawing in a toolglass try to recognize as gesture
            else {
                // need to decide when to turn gestures back on
                const result = points.length > 2 && GestureUtils.GestureRecognizer.Recognize([points]);
                let actionPerformed = false;
                if (Doc.UserDoc().recognizeGestures && result && result.Score > 0.7) {
                    switch (result.Name) {
                        case Gestures.Line:
                        case Gestures.Triangle:
                        case Gestures.Rectangle:
                        case Gestures.Circle:
                            GestureOverlay.makeBezierPolygon(this._points, result.Name, true);
                            actionPerformed = this.dispatchGesture(result.Name);
                            break;
                        case Gestures.Scribble:
                            console.log('scribble');
                            break;
                        case Gestures.RightAngle:
                            console.log('RightAngle');
                            break;
                        default: {
                            /* empty */
                        }
                    }
                }

                // if no gesture (or if the gesture was unsuccessful), "dry" the stroke into an ink document
                if (!actionPerformed) {
                    const newPoints = this._points.reduce((p, pts) => {
                        p.push([pts.X, pts.Y]);
                        return p;
                    }, [] as number[][]);
                    newPoints.pop();
                    const controlPoints: { X: number; Y: number }[] = [];

                    const bezierCurves = fitCurve.default(newPoints, 10);
                    Array.from(bezierCurves).forEach(curve => {
                        controlPoints.push({ X: curve[0][0], Y: curve[0][1] });
                        controlPoints.push({ X: curve[1][0], Y: curve[1][1] });
                        controlPoints.push({ X: curve[2][0], Y: curve[2][1] });
                        controlPoints.push({ X: curve[3][0], Y: curve[3][1] });
                    });
                    const dist = Math.sqrt(
                        (controlPoints[0].X - controlPoints.lastElement().X) * (controlPoints[0].X - controlPoints.lastElement().X) + (controlPoints[0].Y - controlPoints.lastElement().Y) * (controlPoints[0].Y - controlPoints.lastElement().Y)
                    );
                    // eslint-disable-next-line prefer-destructuring
                    if (controlPoints.length > 4 && dist < 10) controlPoints[controlPoints.length - 1] = controlPoints[0];
                    this._points.length = 0;
                    this._points.push(...controlPoints);
                    this.dispatchGesture(Gestures.Stroke);
                }
            }
        }
        this._points.length = 0;
    };

    public static makeBezierPolygon = (points: { X: number; Y: number }[], shape: string, gesture: boolean) => {
        const xs = points.map(p => p.X);
        const ys = points.map(p => p.Y);
        let right = Math.max(...xs);
        let left = Math.min(...xs);
        let bottom = Math.max(...ys);
        let top = Math.min(...ys);
        const firstx = points[0].X;
        const firsty = points[0].Y;
        let lastx = points[points.length - 2].X;
        let lasty = points[points.length - 2].Y;
        let fourth = (lastx - firstx) / 4;
        if (isNaN(fourth) || fourth === 0) {
            fourth = 0.01;
        }
        let m = (lasty - firsty) / (lastx - firstx);
        if (isNaN(m) || m === 0) {
            m = 0.01;
        }
        // const b = firsty - m * firstx;
        if (shape === 'noRec') {
            return undefined;
        }
        if (!gesture) {
            // if shape options is activated in inkOptionMenu
            // take second to last point because _point[length-1] is _points[0]
            right = points[points.length - 2].X;
            left = points[0].X;
            bottom = points[points.length - 2].Y;
            top = points[0].Y;
            if (shape !== Gestures.Arrow && shape !== Gestures.Line && shape !== Gestures.Circle) {
                if (left > right) {
                    const temp = right;
                    right = left;
                    left = temp;
                }
                if (top > bottom) {
                    const temp = top;
                    top = bottom;
                    bottom = temp;
                }
            }
        }
        points.length = 0;
        switch (shape) {
            case Gestures.Rectangle:
                points.push({ X: left, Y: top }); // curr pt
                points.push({ X: left, Y: top }); // curr first ctrl pt
                points.push({ X: right, Y: top }); // next ctrl pt
                points.push({ X: right, Y: top }); // next pt

                points.push({ X: right, Y: top }); // next pt
                points.push({ X: right, Y: top }); // next first ctrl pt
                points.push({ X: right, Y: bottom }); // next next ctrl pt
                points.push({ X: right, Y: bottom }); // next next pt

                points.push({ X: right, Y: bottom });
                points.push({ X: right, Y: bottom });
                points.push({ X: left, Y: bottom });
                points.push({ X: left, Y: bottom });

                points.push({ X: left, Y: bottom });
                points.push({ X: left, Y: bottom });
                points.push({ X: left, Y: top });
                points.push({ X: left, Y: top });

                break;

            case Gestures.Triangle:
                points.push({ X: left, Y: bottom });
                points.push({ X: left, Y: bottom });

                points.push({ X: right, Y: bottom });
                points.push({ X: right, Y: bottom });
                points.push({ X: right, Y: bottom });
                points.push({ X: right, Y: bottom });

                points.push({ X: (right + left) / 2, Y: top });
                points.push({ X: (right + left) / 2, Y: top });
                points.push({ X: (right + left) / 2, Y: top });
                points.push({ X: (right + left) / 2, Y: top });

                points.push({ X: left, Y: bottom });
                points.push({ X: left, Y: bottom });

                break;
            case Gestures.Circle:
                {
                    // Approximation of a circle using 4 Bézier curves in which the constant "c" reduces the maximum radial drift to 0.019608%,
                    // making the curves indistinguishable from a circle.
                    // Source: https://spencermortensen.com/articles/bezier-circle/
                    const c = 0.551915024494;
                    const centerX = (Math.max(left, right) + Math.min(left, right)) / 2;
                    const centerY = (Math.max(top, bottom) + Math.min(top, bottom)) / 2;
                    const radius = Math.max(centerX - Math.min(left, right), centerY - Math.min(top, bottom));

                    // Dividing the circle into four equal sections, and fitting each section to a cubic Bézier curve.
                    points.push({ X: centerX, Y: centerY + radius }); // curr pt
                    points.push({ X: centerX + c * radius, Y: centerY + radius }); // curr first ctrl pt
                    points.push({ X: centerX + radius, Y: centerY + c * radius }); // next pt ctrl pt
                    points.push({ X: centerX + radius, Y: centerY }); // next pt

                    points.push({ X: centerX + radius, Y: centerY }); // next pt
                    points.push({ X: centerX + radius, Y: centerY - c * radius }); // next first ctrl pt
                    points.push({ X: centerX + c * radius, Y: centerY - radius });
                    points.push({ X: centerX, Y: centerY - radius });

                    points.push({ X: centerX, Y: centerY - radius });
                    points.push({ X: centerX - c * radius, Y: centerY - radius });
                    points.push({ X: centerX - radius, Y: centerY - c * radius });
                    points.push({ X: centerX - radius, Y: centerY });

                    points.push({ X: centerX - radius, Y: centerY });
                    points.push({ X: centerX - radius, Y: centerY + c * radius });
                    points.push({ X: centerX - c * radius, Y: centerY + radius });
                    points.push({ X: centerX, Y: centerY + radius });
                }
                break;

            case Gestures.Line:
                if (Math.abs(firstx - lastx) < 10 && Math.abs(firsty - lasty) > 10) {
                    lastx = firstx;
                }
                if (Math.abs(firsty - lasty) < 10 && Math.abs(firstx - lastx) > 10) {
                    lasty = firsty;
                }
                points.push({ X: firstx, Y: firsty });
                points.push({ X: firstx, Y: firsty });

                points.push({ X: lastx, Y: lasty });
                points.push({ X: lastx, Y: lasty });
                break;
            case Gestures.Arrow:
                {
                    const x1 = left;
                    const y1 = top;
                    const x2 = right;
                    const y2 = bottom;
                    const L1 = Math.sqrt(Math.abs(x1 - x2) ** 2 + Math.abs(y1 - y2) ** 2);
                    const L2 = L1 / 5;
                    const angle = 0.785398;
                    const x3 = x2 + (L2 / L1) * ((x1 - x2) * Math.cos(angle) + (y1 - y2) * Math.sin(angle));
                    const y3 = y2 + (L2 / L1) * ((y1 - y2) * Math.cos(angle) - (x1 - x2) * Math.sin(angle));
                    const x4 = x2 + (L2 / L1) * ((x1 - x2) * Math.cos(angle) - (y1 - y2) * Math.sin(angle));
                    const y4 = y2 + (L2 / L1) * ((y1 - y2) * Math.cos(angle) + (x1 - x2) * Math.sin(angle));
                    points.push({ X: x1, Y: y1 });
                    points.push({ X: x2, Y: y2 });
                    points.push({ X: x3, Y: y3 });
                    points.push({ X: x4, Y: y4 });
                    points.push({ X: x2, Y: y2 });
                }
                break;
            default:
        }
        return points;
    };

    dispatchGesture = (gesture: Gestures, stroke?: InkData, text?: string) => {
        const points = (stroke ?? this._points).slice();
        return (
            document.elementFromPoint(points[0].X, points[0].Y)?.dispatchEvent(
                new CustomEvent<GestureUtils.GestureEvent>('dashOnGesture', {
                    bubbles: true,
                    detail: {
                        points,
                        gesture,
                        bounds: InkField.getBounds(points),
                        text,
                    },
                })
            ) || false
        );
    };

    @computed get svgBounds() {
        return InkField.getBounds(this._points);
    }

    get elements() {
        const selView = DocumentView.DownDocView;
        const width = Number(ActiveInkWidth()) * NumCast(selView?.Document._freeform_scale, 1); // * (selView?.screenToViewTransform().Scale || 1);
        const rect = this._overlayRef.current?.getBoundingClientRect();
        const B = { left: -20000, right: 20000, top: -20000, bottom: 20000, width: 40000, height: 40000 }; // this.getBounds(this._points, true);
        B.left -= width / 2;
        B.right += width / 2;
        B.top = B.top - width / 2 - (rect?.y || 0);
        B.bottom += width / 2;
        B.width += width;
        B.height += width;
        const fillColor = ActiveFillColor();
        const strokeColor = fillColor && fillColor !== 'transparent' ? fillColor : ActiveInkColor();
        return [
            this.props.children,
            this._palette,
            [
                this._strokes.map((l, i) => {
                    const b = { left: -20000, right: 20000, top: -20000, bottom: 20000, width: 40000, height: 40000 }; // this.getBounds(l, true);
                    return (
                        // eslint-disable-next-line react/no-array-index-key
                        <svg key={i} width={b.width} height={b.height} style={{ top: 0, left: 0, transform: `translate(${b.left}px, ${b.top}px)`, pointerEvents: 'none', position: 'absolute', zIndex: 30000, overflow: 'visible' }}>
                            {InteractionUtils.CreatePolyline(
                                l,
                                b.left,
                                b.top,
                                strokeColor,
                                width,
                                width,
                                'miter',
                                'round',
                                ActiveInkBezierApprox(),
                                'none' /* ActiveFillColor() */,
                                ActiveArrowStart(),
                                ActiveArrowEnd(),
                                ActiveArrowScale(),
                                ActiveDash(),
                                1,
                                1,
                                this.InkShape as Gestures,
                                'none',
                                1.0,
                                false
                            )}
                        </svg>
                    );
                }),
                this._points.length <= 1 ? null : (
                    <svg key="svg" width={B.width} height={B.height} style={{ top: 0, left: 0, transform: `translate(${B.left}px, ${B.top}px)`, pointerEvents: 'none', position: 'absolute', zIndex: 30000, overflow: 'visible' }}>
                        {InteractionUtils.CreatePolyline(
                            this._points.map(p => ({ X: p.X - (rect?.x || 0), Y: p.Y - (rect?.y || 0) })),
                            B.left,
                            B.top,
                            ActiveInkColor(),
                            width,
                            width,
                            'miter',
                            'round',
                            '',
                            'none' /* ActiveFillColor() */,
                            ActiveArrowStart(),
                            ActiveArrowEnd(),
                            ActiveArrowScale(),
                            ActiveDash(),
                            1,
                            1,
                            this.InkShape as Gestures,
                            'none',
                            1.0,
                            false
                        )}
                    </svg>
                ),
            ],
        ];
    }
    screenToLocalTransform = () => new Transform(-(this._thumbX ?? 0), -(this._thumbY ?? 0) + this.height, 1);
    return300 = () => 300;
    @action
    public openFloatingDoc = (doc: Doc) => {
        this._clipboardDoc = (
            <DocumentView
                Document={doc}
                addDocument={undefined}
                addDocTab={returnFalse}
                pinToPres={emptyFunction}
                removeDocument={undefined}
                ScreenToLocalTransform={this.screenToLocalTransform}
                PanelWidth={this.return300}
                PanelHeight={this.return300}
                isDocumentActive={returnFalse}
                isContentActive={returnFalse}
                renderDepth={0}
                styleProvider={returnEmptyString}
                containerViewPath={returnEmptyDocViewList}
                focus={emptyFunction}
                whenChildContentsActiveChanged={emptyFunction}
                childFiltersByRanges={returnEmptyFilter}
                childFilters={returnEmptyFilter}
                searchFilterDocs={returnEmptyDoclist}
            />
        );
    };

    @action
    public closeFloatingDoc = () => {
        this._clipboardDoc = undefined;
    };

    render() {
        return (
            <div className="gestureOverlay-cont" style={{ pointerEvents: this._props.isActive ? 'all' : 'none' }} ref={this._overlayRef} onPointerDown={this.onPointerDown}>
                {this.elements}

                <div
                    className="clipboardDoc-cont"
                    style={{
                        height: this.height,
                        width: this.height,
                        pointerEvents: this._clipboardDoc ? 'unset' : 'none',
                        touchAction: 'none',
                        transform: `translate(${this._thumbX}px, ${(this._thumbY || 0) - this.height} px)`,
                    }}>
                    {this._clipboardDoc}
                </div>
                <div
                    className="filter-cont"
                    style={{
                        transform: `translate(${this._thumbX}px, ${(this._thumbY || 0) - this.height}px)`,
                        height: this.height,
                        width: this.height,
                        pointerEvents: 'none',
                        touchAction: 'none',
                        display: this.showBounds ? 'unset' : 'none',
                    }}
                />
            </div>
        );
    }
}

ScriptingGlobals.add('GestureOverlay', GestureOverlay);
// eslint-disable-next-line prefer-arrow-callback
ScriptingGlobals.add(function setPen(width: string, color: string, fill: string, arrowStart: string, arrowEnd: string, dash: string) {
    runInAction(() => {
        GestureOverlay.Instance.SavedColor = ActiveInkColor();
        SetActiveInkColor(color);
        GestureOverlay.Instance.SavedWidth = ActiveInkWidth();
        SetActiveInkWidth(width);
        SetActiveFillColor(fill);
        SetActiveArrowStart(arrowStart);
        SetActiveArrowStart(arrowEnd);
        SetActiveDash(dash);
    });
});
// eslint-disable-next-line prefer-arrow-callback
ScriptingGlobals.add(function resetPen() {
    runInAction(() => {
        SetActiveInkColor(GestureOverlay.Instance.SavedColor ?? 'rgb(0, 0, 0)');
        SetActiveInkWidth(GestureOverlay.Instance.SavedWidth?.toString() ?? '2');
    });
}, 'resets the pen tool');
ScriptingGlobals.add(
    // eslint-disable-next-line prefer-arrow-callback
    function createText(text: string, X: number, Y: number) {
        GestureOverlay.Instance.dispatchGesture(Gestures.Text, [{ X, Y }], text);
    },
    'creates a text document with inputted text and coordinates',
    '(text: any, x: any, y: any)'
);
