Asymmetrik/ngx-starter

import { SortDir } from './sorting.model';

export interface PagingResults<T = unknown> {
    pageNumber: number;
    pageSize: number;
    totalPages: number;
    totalSize: number;
    elements: T[];
}

export const NULL_PAGING_RESULTS: PagingResults = {
    pageNumber: 0,
    pageSize: 0,
    totalPages: 0,
    totalSize: 0,
    elements: []
};

export interface PageChange {
    pageNumber: number;
    pageSize: number;
}

export class PagingOptions {
    constructor(
        public pageNumber: number = 0,
        public pageSize: number = 50,
        public totalPages: number = 0,
        public totalSize: number = 0,
        public sortField?: string | string[],
        public sortDir?: SortDir
    ) {}

    reset() {
        this.pageNumber = 0;
        this.pageSize = 50;
        this.totalPages = 0;
        this.totalSize = 0;
    }

    set(pageNumber: number, pageSize: number, totalPages: number, totalSize: number) {
        this.pageNumber = pageNumber;
        this.pageSize = pageSize;
        this.totalPages = totalPages;
        this.totalSize = totalSize;
    }

    update(pageNumber: number, pageSize: number) {
        this.pageNumber = pageNumber;
        this.pageSize = pageSize;
    }

    setPageNumber(pageNumber: number) {
        this.pageNumber = pageNumber;
    }

    toObj(): {
        page: PagingOptions['pageNumber'];
        size: PagingOptions['pageSize'];
        sort?: PagingOptions['sortField'];
        dir?: PagingOptions['sortDir'];
    } {
        return {
            page: this.pageNumber,
            size: this.pageSize,
            ...(this.sortField && { sort: this.sortField }),
            ...(this.sortDir && { dir: this.sortDir })
        };
    }
}