import {
    Autowired,
    Events,
    EventService,
    GridApi,
    PostConstruct,
    IStatusPanelComp
} from 'ag-grid-community';
import {NameValueComp} from "./nameValueComp";

export class FilteredRowsComp extends NameValueComp implements IStatusPanelComp {

    @Autowired('eventService') private eventService: EventService;
    @Autowired('gridApi') private gridApi: GridApi;

    constructor() {
        super('filteredRowCount', 'Filtered');
    }

    @PostConstruct
    protected postConstruct(): void {
        super.postConstruct();

        // this component is only really useful with client side rowmodel
        if (this.gridApi.getModel().getType() !== 'clientSide') {
            console.warn(`ag-Grid: agFilteredRowCountComponent should only be used with the client side row model.`);
            return;
        }

        this.addCssClass('ag-status-panel');
        this.addCssClass('ag-status-panel-filtered-row-count');

        this.setVisible(true);

        const listener = this.onDataChanged.bind(this);
        this.eventService.addEventListener(Events.EVENT_MODEL_UPDATED, listener);
    }

    private onDataChanged() {
        const totalRowCountValue = this.getTotalRowCountValue();
        const filteredRowCountValue = this.getFilteredRowCountValue();
        this.setValue(filteredRowCountValue);
        this.setVisible(totalRowCountValue !== filteredRowCountValue);
    }

    private getTotalRowCountValue(): number {
        let totalRowCount = 0;
        this.gridApi.forEachNode((node) => totalRowCount += 1);
        return totalRowCount;
    }

    private getFilteredRowCountValue(): number {
        let filteredRowCount = 0;
        this.gridApi.forEachNodeAfterFilter((node) => filteredRowCount += 1);
        return filteredRowCount;
    }

    public init() {}
}