import { action, computed, IReactionDisposer, reaction } from 'mobx';
import { observer } from 'mobx-react';
import { Doc, HeightSym, WidthSym } from '../../../fields/Doc';
import { NumCast, StrCast } from '../../../fields/Types';
import { emptyFunction, returnFalse, returnTrue, setupMoveUpEvents } from '../../../Utils';
import { DocUtils } from '../../documents/Documents';
import { SelectionManager } from '../../util/SelectionManager';
import { SnappingManager } from '../../util/SnappingManager';
import { undoBatch, UndoManager } from '../../util/UndoManager';
import { CollectionFreeFormView } from './collectionFreeForm/CollectionFreeFormView';
import './CollectionPileView.scss';
import { CollectionSubView } from './CollectionSubView';
import React = require('react');
import { ScriptField } from '../../../fields/ScriptField';
import { OpenWhere } from '../nodes/DocumentView';
import { computePassLayout, computeStarburstLayout } from './collectionFreeForm';

@observer
export class CollectionPileView extends CollectionSubView() {
    _originalChrome: any = '';
    _disposers: { [name: string]: IReactionDisposer } = {};

    componentDidMount() {
        if (this.layoutEngine() !== computePassLayout.name && this.layoutEngine() !== computeStarburstLayout.name) {
            this.Document._pileLayoutEngine = computePassLayout.name;
        }
        this._originalChrome = this.layoutDoc._chromeHidden;
        this.layoutDoc._chromeHidden = true;

        // pileups are designed to go away when they are empty.
        this._disposers.selected = reaction(
            () => this.childDocs.length,
            num => !num && this.props.ContainingCollectionView?.removeDocument(this.props.Document)
        );
    }
    componentWillUnmount() {
        this.layoutDoc._chromeHidden = this._originalChrome;
        Object.values(this._disposers).forEach(disposer => disposer?.());
    }

    layoutEngine = () => StrCast(this.Document._pileLayoutEngine);

    @undoBatch
    addPileDoc = (doc: Doc | Doc[]) => {
        (doc instanceof Doc ? [doc] : doc).map(d => DocUtils.iconify(d));
        return this.props.addDocument?.(doc) || false;
    };

    @undoBatch
    removePileDoc = (doc: Doc | Doc[], targetCollection: Doc | undefined, addDoc: (doc: Doc | Doc[]) => boolean) => {
        (doc instanceof Doc ? [doc] : doc).map(undoBatch(d => Doc.deiconifyView(d)));
        return this.props.moveDocument?.(doc, targetCollection, addDoc) || false;
    };

    toggleIcon = () => {
        return ScriptField.MakeScript('documentView.iconify()', { documentView: 'any' });
    };

    // returns the contents of the pileup in a CollectionFreeFormView
    @computed get contents() {
        const isStarburst = this.layoutEngine() === computeStarburstLayout.name;
        return (
            <div className="collectionPileView-innards" style={{ pointerEvents: isStarburst || SnappingManager.GetIsDragging() ? undefined : 'none' }}>
                <CollectionFreeFormView
                    {...this.props}
                    layoutEngine={this.layoutEngine}
                    childDocumentsActive={isStarburst ? returnTrue : undefined}
                    addDocument={this.addPileDoc}
                    childCanEmbedOnDrag={true}
                    childClickScript={this.toggleIcon()}
                    moveDocument={this.removePileDoc}
                />
            </div>
        );
    }

    // toggles the pileup between starburst to compact
    toggleStarburst = action(() => {
        if (this.layoutEngine() === computeStarburstLayout.name) {
            const defaultSize = 110;
            this.rootDoc.x = NumCast(this.rootDoc.x) + this.layoutDoc[WidthSym]() / 2 - NumCast(this.layoutDoc._starburstPileWidth, defaultSize) / 2;
            this.rootDoc.y = NumCast(this.rootDoc.y) + this.layoutDoc[HeightSym]() / 2 - NumCast(this.layoutDoc._starburstPileHeight, defaultSize) / 2;
            this.layoutDoc._width = NumCast(this.layoutDoc._starburstPileWidth, defaultSize);
            this.layoutDoc._height = NumCast(this.layoutDoc._starburstPileHeight, defaultSize);
            DocUtils.pileup(this.childDocs, undefined, undefined, NumCast(this.layoutDoc._width) / 2, false);
            this.layoutDoc._panX = 0;
            this.layoutDoc._panY = -10;
            this.props.Document._pileLayoutEngine = computePassLayout.name;
        } else {
            const defaultSize = 25;
            !this.layoutDoc._starburstRadius && (this.layoutDoc._starburstRadius = 250);
            !this.layoutDoc._starburstDocScale && (this.layoutDoc._starburstDocScale = 2.5);
            if (this.layoutEngine() === computePassLayout.name) {
                this.rootDoc.x = NumCast(this.rootDoc.x) + this.layoutDoc[WidthSym]() / 2 - defaultSize / 2;
                this.rootDoc.y = NumCast(this.rootDoc.y) + this.layoutDoc[HeightSym]() / 2 - defaultSize / 2;
                this.layoutDoc._starburstPileWidth = this.layoutDoc[WidthSym]();
                this.layoutDoc._starburstPileHeight = this.layoutDoc[HeightSym]();
            }
            this.layoutDoc._panX = this.layoutDoc._panY = 0;
            this.layoutDoc._width = this.layoutDoc._height = defaultSize;
            this.props.Document._pileLayoutEngine = computeStarburstLayout.name;
        }
    });

    // for dragging documents out of the pileup view
    _undoBatch: UndoManager.Batch | undefined;
    pointerDown = (e: React.PointerEvent) => {
        let dist = 0;
        SnappingManager.SetIsDragging(true);
        setupMoveUpEvents(
            this,
            e,
            (e: PointerEvent, down: number[], delta: number[]) => {
                if (this.layoutEngine() === 'pass' && this.childDocs.length && e.shiftKey) {
                    dist += Math.sqrt(delta[0] * delta[0] + delta[1] * delta[1]);
                    if (dist > 100) {
                        if (!this._undoBatch) {
                            this._undoBatch = UndoManager.StartBatch('layout pile');
                        }
                        const doc = this.childDocs[0];
                        doc.x = e.clientX;
                        doc.y = e.clientY;
                        this.props.addDocTab(doc, OpenWhere.inParentFromScreen) && (this.props.removeDocument?.(doc) || false);
                        dist = 0;
                    }
                }
                return false;
            },
            () => {
                this._undoBatch?.end();
                this._undoBatch = undefined;
                SnappingManager.SetIsDragging(false);
            },
            emptyFunction,
            e.shiftKey && this.layoutEngine() === computePassLayout.name,
            this.layoutEngine() === computePassLayout.name && e.shiftKey
        ); // this sets _doubleTap
    };

    // onClick for toggling the pileup view
    @undoBatch
    @action
    onClick = (e: React.MouseEvent) => {
        if (e.button === 0) {
            SelectionManager.DeselectAll();
            this.toggleStarburst();
            e.stopPropagation();
        }
    };

    render() {
        return (
            <div className={`collectionPileView`} onClick={this.onClick} onPointerDown={this.pointerDown} style={{ width: this.props.PanelWidth(), height: '100%' }}>
                {this.contents}
            </div>
        );
    }
}