import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
import { computed, makeObservable } from 'mobx';
import { observer } from 'mobx-react';
import * as React from 'react';
import { Utils, emptyFunction, returnFalse, returnZero } from '../../../Utils';
import { Doc, DocListCast } 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 { SelectionManager } from '../../util/SelectionManager';
import { StyleProp } from '../StyleProvider';
import { DocumentView } from '../nodes/DocumentView';
import { FocusViewOptions } from '../nodes/FieldView';
import './CollectionCarousel3DView.scss';
import { CollectionSubView } from './CollectionSubView';
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: any) {
        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);
    panelWidth = () => this._props.PanelWidth() / 3;
    panelHeight = () => this._props.PanelHeight() * Number(CAROUSEL3D_SIDE_SCALE);
    onChildDoubleClick = () => ScriptCast(this.layoutDoc.onChildDoubleClick);
    isContentActive = () => this._props.isSelected() || this._props.isContentActive() || this._props.isAnyChildContentActive();
    isChildContentActive = () => (this.isContentActive() ? true : false);
    childScreenToLocal = () =>
        this._props // document's left is the panel shifted by the doc's index * panelWidth/#docs.  But it scales by centerScale around its center, so it's left moves left by the distance of the left from the center (panelwidth/2) * the scale delta (centerScale-1)
            .ScreenToLocalTransform() // the top behaves the same way ecept it's shifted by the 'top' amount specified for the panel in css and then by the scale factor.
            .translate(-this.panelWidth() + ((this.centerScale - 1) * this.panelWidth()) / 2, -((Number(CAROUSEL3D_TOP) / 100) * this._props.PanelHeight()) + ((this.centerScale - 1) * this.panelHeight()) / 2)
            .scale(1 / this.centerScale);

    focus = (anchor: Doc, options: FocusViewOptions) => {
        const docs = DocListCast(this.Document[this.fieldKey ?? Doc.LayoutFieldKey(this.Document)]);
        if (anchor.type !== DocumentType.CONFIG && !docs.includes(anchor)) return;
        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 }) => {
            return (
                <DocumentView
                    {...this._props}
                    Document={childPair.layout}
                    TemplateDataDocument={childPair.data}
                    //suppressSetHeight={true}
                    NativeWidth={returnZero}
                    NativeHeight={returnZero}
                    layout_fitWidth={undefined}
                    onDoubleClickScript={this.onChildDoubleClick}
                    renderDepth={this._props.renderDepth + 1}
                    LayoutTemplate={this._props.childLayoutTemplate}
                    LayoutTemplateString={this._props.childLayoutString}
                    focus={this.focus}
                    ScreenToLocalTransform={this.childScreenToLocal}
                    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) => {
            return (
                <div key={childPair.layout[Id]} className={`collectionCarousel3DView-item${index === currentIndex ? '-active' : ''} ${index}`} style={{ width: this.panelWidth() }}>
                    {displayDoc(childPair)}
                </div>
            );
        });
    }

    changeSlide = (direction: number) => {
        SelectionManager.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 ? false : true;
        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={e => this.onArrowClick(-1)} />
                <div title="click to advance" key="fwd" className="carousel3DView-fwd" onClick={e => 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),
                    color: this._props.styleProvider?.(this.layoutDoc, this._props, StyleProp.Color),
                }}>
                <div className="carousel-wrapper" style={{ transform: `translateX(${this.translateX}px)` }}>
                    {this.content}
                </div>
                {this.buttons}
                <div className="dot-bar">{this.dots}</div>
            </div>
        );
    }
}