import React = require('react');
import { action, observable } from 'mobx';
import { observer } from 'mobx-react';
import { DocServer } from '../client/DocServer';
import { DragManager } from '../client/util/DragManager';
import { Doc } from '../fields/Doc';
import { GestureUtils } from '../pen-gestures/GestureUtils';
import { GestureContent, MobileDocumentUploadContent, MobileInkOverlayContent, UpdateMobileInkOverlayPositionContent } from '../server/Message';
import './MobileInkOverlay.scss';

@observer
export default class MobileInkOverlay extends React.Component {
    public static Instance: MobileInkOverlay;

    @observable private _scale: number = 1;
    @observable private _width: number = 0;
    @observable private _height: number = 0;
    @observable private _x: number = -300;
    @observable private _y: number = -300;
    @observable private _text: string = '';

    @observable private _offsetX: number = 0;
    @observable private _offsetY: number = 0;
    @observable private _isDragging: boolean = false;
    private _mainCont: React.RefObject<HTMLDivElement> = React.createRef();

    constructor(props: Readonly<{}>) {
        super(props);
        MobileInkOverlay.Instance = this;
    }

    initialSize(mobileWidth: number, mobileHeight: number) {
        const maxWidth = window.innerWidth - 30;
        const maxHeight = window.innerHeight - 30; // -30 for padding
        if (mobileWidth > maxWidth || mobileHeight > maxHeight) {
            const scale = Math.min(maxWidth / mobileWidth, maxHeight / mobileHeight);
            return { width: mobileWidth * scale, height: mobileHeight * scale, scale: scale };
        }
        return { width: mobileWidth, height: mobileHeight, scale: 1 };
    }

    @action
    initMobileInkOverlay(content: MobileInkOverlayContent) {
        const { width, height, text } = content;
        const scaledSize = this.initialSize(width ? width : 0, height ? height : 0);
        this._width = scaledSize.width;
        this._height = scaledSize.height;
        this._scale = scaledSize.scale;
        this._x = 300; // TODO: center on screen
        this._y = 25; // TODO: center on screen
        this._text = text ? text : '';
    }

    @action
    updatePosition(content: UpdateMobileInkOverlayPositionContent) {
        const { dx, dy, dsize } = content;
        if (dx) this._x += dx;
        if (dy) this._y += dy;
        // TODO: scale dsize
    }

    drawStroke = (content: GestureContent) => {
        // TODO: figure out why strokes drawn in corner of mobile interface dont get inserted

        const { points, bounds } = content;
        console.log('received points', points, bounds);

        const B = {
            right: bounds.right * this._scale + this._x,
            left: bounds.left * this._scale + this._x, // TODO: scale
            bottom: bounds.bottom * this._scale + this._y,
            top: bounds.top * this._scale + this._y, // TODO: scale
            width: bounds.width * this._scale,
            height: bounds.height * this._scale,
        };

        const target = document.elementFromPoint(this._x + 10, this._y + 10);
        target?.dispatchEvent(
            new CustomEvent<GestureUtils.GestureEvent>('dashOnGesture', {
                bubbles: true,
                detail: {
                    points: points,
                    gesture: GestureUtils.Gestures.Stroke,
                    bounds: B,
                },
            })
        );
    };

    uploadDocument = async (content: MobileDocumentUploadContent) => {
        const { docId } = content;
        const doc = await DocServer.GetRefField(docId);

        if (doc && doc instanceof Doc) {
            const target = document.elementFromPoint(this._x + 10, this._y + 10);
            const dragData = new DragManager.DocumentDragData([doc]);
            const complete = new DragManager.DragCompleteEvent(false, dragData);

            if (target) {
                console.log('dispatching upload doc!!!!', target, doc);
                target.dispatchEvent(
                    new CustomEvent<DragManager.DropEvent>('dashOnDrop', {
                        bubbles: true,
                        detail: {
                            x: this._x,
                            y: this._y,
                            complete: complete,
                            altKey: false,
                            metaKey: false,
                            ctrlKey: false,
                            shiftKey: false,
                            embedKey: false,
                        },
                    })
                );
            } else {
                alert('TARGET IS UNDEFINED');
            }
        }
    };

    @action
    dragStart = (e: React.PointerEvent) => {
        document.removeEventListener('pointermove', this.dragging);
        document.removeEventListener('pointerup', this.dragEnd);
        document.addEventListener('pointermove', this.dragging);
        document.addEventListener('pointerup', this.dragEnd);

        this._isDragging = true;
        this._offsetX = e.pageX - this._mainCont.current!.getBoundingClientRect().left;
        this._offsetY = e.pageY - this._mainCont.current!.getBoundingClientRect().top;

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

    @action
    dragging = (e: PointerEvent) => {
        const x = e.pageX - this._offsetX;
        const y = e.pageY - this._offsetY;

        // TODO: don't allow drag over library?
        this._x = Math.min(Math.max(x, 0), window.innerWidth - this._width);
        this._y = Math.min(Math.max(y, 0), window.innerHeight - this._height);

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

    @action
    dragEnd = (e: PointerEvent) => {
        document.removeEventListener('pointermove', this.dragging);
        document.removeEventListener('pointerup', this.dragEnd);

        this._isDragging = false;

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

    render() {
        return (
            <div
                className="mobileInkOverlay"
                style={{
                    width: this._width,
                    height: this._height,
                    position: 'absolute',
                    transform: `translate(${this._x}px, ${this._y}px)`,
                    zIndex: 30000,
                    pointerEvents: 'none',
                    borderStyle: this._isDragging ? 'solid' : 'dashed',
                }}
                ref={this._mainCont}>
                <p>{this._text}</p>
                <div className="mobileInkOverlay-border top" onPointerDown={this.dragStart}></div>
                <div className="mobileInkOverlay-border bottom" onPointerDown={this.dragStart}></div>
                <div className="mobileInkOverlay-border left" onPointerDown={this.dragStart}></div>
                <div className="mobileInkOverlay-border right" onPointerDown={this.dragStart}></div>
            </div>
        );
    }
}