import { Record, SelectionMode } from "./interfaces/dataUnit.js";
import { Filter, Sort } from "./metadata/UnitMetadata.js";

export class SelectionInfo {

    public mode: SelectionMode;
    public filters?: Array<Filter>;
    public sort?: Array<Sort>;
    public getAllRecords?: () => Array<Record>;
    private _records: Array<Record>;
    private _total?: number;

    constructor(records: Array<Record>, mode: SelectionMode = SelectionMode.SOME_RECORDS, total?: number, filters?: Array<Filter>, sort?: Array<Sort>) {
        this._records = records;
        this._total = total;
        this.mode = mode;
        this.filters = filters;
        this.sort = sort;
    }

    public get records(): Array<Record> {
        if (this.isAllRecords()) {
            if (this.getAllRecords != undefined) {
                return this.getAllRecords();
            }
            throw new Error("Erro interno: Impossível retornar os registros selecionados numa seleção virtual.");
        }
        return this._records;
    }

    public get recordIds(): Array<string> | undefined {

        const records = this.records;

        if (records == undefined) {
            return undefined;
        }
        return records.map(record => record.__record__id__);
    }

    public get length(): number {
        if (this.isAllRecords()) {
            return this._total || 0;
        }
        return this.records == undefined ? 0 : (this.records as Array<Record>).length;
    }

    public isAllRecords(): boolean {
        return this.mode === SelectionMode.ALL_RECORDS;
    }

    public isEmpty(): boolean {
        return this.length === 0;
    }
}