wikimedia/mediawiki-extensions-Wikibase

import { Statement } from '@/definitions/wikibase-js-datamodel/Statement';
import { MediaWiki } from '@/@types/mediawiki/MwWindow';
import ReferenceListChangeCounter from '@/ReferenceListChangeCounter';

export default class StatementTracker {
    private track: MediaWiki['track'];
    private refChangeCounter: ReferenceListChangeCounter;

    public constructor(
        track: MediaWiki['track'],
        refChangeCounter: ReferenceListChangeCounter,
    ) {
        this.track = track;
        this.refChangeCounter = refChangeCounter;
    }

    public trackChanges( oldStatement: Statement|null, newStatement: Statement ): void {
        if ( oldStatement === null ) {
            // newly created statement
            return;
        }
        const referenceChangeCount = this.refChangeCounter.countOldReferencesRemovedOrChanged(
            oldStatement.getReferences(),
            newStatement.getReferences(),
        );
        const oldRefCount = oldStatement.getReferences().length;
        const newRefCount = newStatement.getReferences().length;
        if ( this.mainSnakChanged( oldStatement, newStatement ) ) {
            if ( referenceChangeCount === oldRefCount ) {
                // statement value changed + all refs changed
                this.track( 'counter.wikibase.view.tainted-ref.mainSnakChanged.allReferencesChanged', 1 );
            } else if ( referenceChangeCount === 0 && oldRefCount === newRefCount ) {
                // statement value changed + no refs changed
                this.track( 'counter.wikibase.view.tainted-ref.mainSnakChanged.noReferencesChanged', 1 );
            } else {
                // statement value changed + one or more refs changed and not all refs changed
                this.track( 'counter.wikibase.view.tainted-ref.mainSnakChanged.someNotAllReferencesChanged', 1 );
            }
        } else {
            if ( referenceChangeCount >= 1 ) {
                // statement value NOT changed + one or more refs changed
                this.track( 'counter.wikibase.view.tainted-ref.mainSnakUnchanged.someReferencesChanged', 1 );
            }
            if ( this.qualifierChange( oldStatement, newStatement ) ) {
                // statement value NOT changed + one or more qualifiers changed
                this.track( 'counter.wikibase.view.tainted-ref.mainSnakUnchanged.someQualifierChanged', 1 );
            }
        }
    }

    private mainSnakChanged( oldStatement: Statement, newStatement: Statement ): boolean {
        return ( !oldStatement.getClaim().getMainSnak().equals( newStatement.getClaim().getMainSnak() ) );
    }

    private qualifierChange( oldStatement: Statement, newStatement: Statement ): boolean {
        const oldQualifiersList = oldStatement.getClaim().getQualifiers();
        const newQualifiersList = newStatement.getClaim().getQualifiers();

        return !oldQualifiersList.equals( newQualifiersList );
    }
}