import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
import { computed, makeObservable } from 'mobx';
import { observer } from 'mobx-react';
import * as React from 'react';
import { returnZero } from '../../../ClientUtils';
import { Utils } from '../../../Utils';
import { Doc, DocListCast, Opt } from '../../../fields/Doc';
import { Id } from '../../../fields/FieldSymbols';
import { DocCast, NumCast, ScriptCast, StrCast } from '../../../fields/Types';
import { DocumentType } from '../../documents/DocumentTypes';
import { DragManager } from '../../util/DragManager';
import { StyleProp } from '../StyleProp';
import { DocumentView } from '../nodes/DocumentView';
import { FocusViewOptions } from '../nodes/FocusViewOptions';
import './CollectionCarousel3DView.scss';
import { CollectionSubView, SubCollectionViewProps } from './CollectionSubView';
import { Transform } from '../../util/Transform';

// eslint-disable-next-line @typescript-eslint/no-var-requires
const { CAROUSEL3D_CENTER_SCALE, CAROUSEL3D_SIDE_SCALE, CAROUSEL3D_TOP } = require('../global/globalCssVariables.module.scss');

@observer
export class CollectionCarousel3DView extends CollectionSubView() {
    @computed get scrollSpeed() {
        return this.layoutDoc._autoScrollSpeed ? NumCast(this.layoutDoc._autoScrollSpeed) : 1000; // default scroll speed
    }
    constructor(props: SubCollectionViewProps) {
        super(props);
        makeObservable(this);
    }

    private _dropDisposer?: DragManager.DragDropDisposer;

    componentWillUnmount() {
        this._dropDisposer?.();
    }

    protected createDashEventsTarget = (ele: HTMLDivElement | null) => {
        this._dropDisposer?.();
        if (ele) {
            this._dropDisposer = DragManager.MakeDropTarget(ele, this.onInternalDrop.bind(this), this.layoutDoc);
        }
    };

    @computed get carouselItems() {
        return this.childLayoutPairs.filter(pair => pair.layout.type !== DocumentType.LINK);
    }

    centerScale = Number(CAROUSEL3D_CENTER_SCALE);
    sideScale = Number(CAROUSEL3D_SIDE_SCALE);
    panelWidth = () => this._props.PanelWidth() / 3;
    panelHeight = () => this._props.PanelHeight() * this.sideScale;
    onChildDoubleClick = () => ScriptCast(this.layoutDoc.onChildDoubleClick);
    isContentActive = () => this._props.isSelected() || this._props.isContentActive() || this._props.isAnyChildContentActive();
    isChildContentActive = () => !!this.isContentActive();
    childScreenLeftToLocal = () =>
        this._props
            .ScreenToLocalTransform()
            .scale(this._props.NativeDimScaling?.() || 1)
            .translate(-(this.panelWidth() - this.panelWidth() * this.sideScale) / 2, -(this.panelHeight() - this.panelHeight() * this.sideScale) / 2 - (Number(CAROUSEL3D_TOP) / 100) * this._props.PanelHeight())
            .scale(1 / this.sideScale);
    childScreenRightToLocal = () =>
        this._props
            .ScreenToLocalTransform()
            .scale(this._props.NativeDimScaling?.() || 1)
            .translate(-2 * this.panelWidth() - (this.panelWidth() - this.panelWidth() * this.sideScale) / 2, -(this.panelHeight() - this.panelHeight() * this.sideScale) / 2 - (Number(CAROUSEL3D_TOP) / 100) * this._props.PanelHeight())
            .scale(1 / this.sideScale);
    childCenterScreenToLocal = () =>
        this._props
            .ScreenToLocalTransform()
            .scale(this._props.NativeDimScaling?.() || 1)
            .translate(
                -this.panelWidth() + ((this.centerScale - 1) * this.panelWidth()) / 2, // Focused Doc is shifted right by 1/3 panel width then left by increased size percent of center * 1/2 * panel width / 3
                -((Number(CAROUSEL3D_TOP) / 100) * this._props.PanelHeight()) + ((this.centerScale - 1) * this.panelHeight()) / 2
            ) // top is top margin % of panelHeight - increased size percent of center * panelHeight / 2
            .scale(1 / this.centerScale);

    focus = (anchor: Doc, options: FocusViewOptions): Opt<number> => {
        const docs = DocListCast(this.Document[this.fieldKey ?? Doc.LayoutFieldKey(this.Document)]);
        if (anchor.type !== DocumentType.CONFIG && !docs.includes(anchor)) return undefined;
        options.didMove = true;
        const target = DocCast(anchor.annotationOn) ?? anchor;
        const index = docs.indexOf(target);
        index !== -1 && (this.layoutDoc._carousel_index = index);
        return undefined;
    };

    @computed get content() {
        const currentIndex = NumCast(this.layoutDoc._carousel_index);
        const displayDoc = (childPair: { layout: Doc; data: Doc }, dxf: () => Transform) => (
            <DocumentView
                // eslint-disable-next-line react/jsx-props-no-spreading
                {...this._props}
                Document={childPair.layout}
                TemplateDataDocument={childPair.data}
                // suppressSetHeight={true}
                NativeWidth={returnZero}
                NativeHeight={returnZero}
                fitWidth={undefined}
                containerViewPath={this.childContainerViewPath}
                onDoubleClickScript={this.onChildDoubleClick}
                renderDepth={this._props.renderDepth + 1}
                LayoutTemplate={this._props.childLayoutTemplate}
                LayoutTemplateString={this._props.childLayoutString}
                focus={this.focus}
                ScreenToLocalTransform={dxf}
                isContentActive={this.isChildContentActive}
                isDocumentActive={this._props.childDocumentsActive?.() || this.Document._childDocumentsActive ? this._props.isDocumentActive : this.isContentActive}
                PanelWidth={this.panelWidth}
                PanelHeight={this.panelHeight}
            />
        );

        return this.carouselItems.map((childPair, index) => (
            <div key={childPair.layout[Id]} className={`collectionCarousel3DView-item${index === currentIndex ? '-active' : ''} ${index}`} style={{ width: this.panelWidth() }}>
                {displayDoc(childPair, index < currentIndex ? this.childScreenLeftToLocal : index === currentIndex ? this.childCenterScreenToLocal : this.childScreenRightToLocal)}
            </div>
        ));
    }

    changeSlide = (direction: number) => {
        DocumentView.DeselectAll();
        this.layoutDoc._carousel_index = (NumCast(this.layoutDoc._carousel_index) + direction + this.carouselItems.length) % this.carouselItems.length;
    };

    onArrowClick = (direction: number) => {
        this.changeSlide(direction);
        !this.layoutDoc.autoScrollOn && (this.layoutDoc.showScrollButton = direction === 1 ? 'fwd' : 'back'); // while autoscroll is on, keep the other autoscroll button hidden
        !this.layoutDoc.autoScrollOn && this.fadeScrollButton(); // keep pause button visible while autoscroll is on
    };

    interval?: number;
    startAutoScroll = (direction: number) => {
        this.interval = window.setInterval(() => {
            this.changeSlide(direction);
        }, this.scrollSpeed);
    };

    stopAutoScroll = () => {
        window.clearInterval(this.interval);
        this.interval = undefined;
        this.fadeScrollButton();
    };

    toggleAutoScroll = (direction: number) => {
        this.layoutDoc.autoScrollOn = !this.layoutDoc.autoScrollOn;
        this.layoutDoc.autoScrollOn ? this.startAutoScroll(direction) : this.stopAutoScroll();
    };

    fadeScrollButton = () => {
        window.setTimeout(() => {
            !this.layoutDoc.autoScrollOn && (this.layoutDoc.showScrollButton = 'none'); // fade away after 1.5s if it's not clicked.
        }, 1500);
    };

    @computed get buttons() {
        return (
            <div className="arrow-buttons">
                <div title="click to go back" key="back" className="carousel3DView-back" onClick={() => this.onArrowClick(-1)} />
                <div title="click to advance" key="fwd" className="carousel3DView-fwd" onClick={() => this.onArrowClick(1)} />
                {/* {this.autoScrollButton} */}
            </div>
        );
    }

    @computed get autoScrollButton() {
        const whichButton = this.layoutDoc.showScrollButton;
        return (
            <>
                <div className={`carousel3DView-back-scroll${whichButton === 'back' ? '' : '-hidden'}`} style={{ background: `${StrCast(this.Document.backgroundColor)}` }} onClick={() => this.toggleAutoScroll(-1)}>
                    {this.layoutDoc.autoScrollOn ? <FontAwesomeIcon icon="pause" size="1x" /> : <FontAwesomeIcon icon="angle-double-left" size="1x" />}
                </div>
                <div className={`carousel3DView-fwd-scroll${whichButton === 'fwd' ? '' : '-hidden'}`} style={{ background: `${StrCast(this.Document.backgroundColor)}` }} onClick={() => this.toggleAutoScroll(1)}>
                    {this.layoutDoc.autoScrollOn ? <FontAwesomeIcon icon="pause" size="1x" /> : <FontAwesomeIcon icon="angle-double-right" size="1x" />}
                </div>
            </>
        );
    }

    @computed get dots() {
        return this.carouselItems.map((_child, index) => (
            <div
                key={Utils.GenerateGuid()}
                className={`dot${index === NumCast(this.layoutDoc._carousel_index) ? '-active' : ''}`}
                onClick={() => {
                    this.layoutDoc._carousel_index = index;
                }}
            />
        ));
    }
    @computed get translateX() {
        const index = NumCast(this.layoutDoc._carousel_index);
        return this.panelWidth() * (1 - index);
    }

    render() {
        return (
            <div
                className="collectionCarousel3DView-outer"
                ref={this.createDashEventsTarget}
                style={{
                    background: this._props.styleProvider?.(this.layoutDoc, this._props, StyleProp.BackgroundColor) as string,
                    color: this._props.styleProvider?.(this.layoutDoc, this._props, StyleProp.Color) as string,
                }}>
                <div className="carousel-wrapper" style={{ transform: `translateX(${this.translateX}px)` }}>
                    {this.content}
                </div>
                {this.buttons}
                <div className="dot-bar">{this.dots}</div>
            </div>
        );
    }
}
