"use strict";
function paginate(totalItems, currentPage, pageSize, maxPages) {
    if (currentPage === void 0) { currentPage = 1; }
    if (pageSize === void 0) { pageSize = 10; }
    if (maxPages === void 0) { maxPages = 10; }
    // calculate total pages
    var totalPages = Math.ceil(totalItems / pageSize);
    // ensure current page isn't out of range
    if (currentPage < 1) {
        currentPage = 1;
    }
    else if (currentPage > totalPages) {
        currentPage = totalPages;
    }
    var startPage, endPage;
    if (totalPages <= maxPages) {
        // total pages less than max so show all pages
        startPage = 1;
        endPage = totalPages;
    }
    else {
        // total pages more than max so calculate start and end pages
        var maxPagesBeforeCurrentPage = Math.floor(maxPages / 2);
        var maxPagesAfterCurrentPage = Math.ceil(maxPages / 2) - 1;
        if (currentPage <= maxPagesBeforeCurrentPage) {
            // current page near the start
            startPage = 1;
            endPage = maxPages;
        }
        else if (currentPage + maxPagesAfterCurrentPage >= totalPages) {
            // current page near the end
            startPage = totalPages - maxPages + 1;
            endPage = totalPages;
        }
        else {
            // current page somewhere in the middle
            startPage = currentPage - maxPagesBeforeCurrentPage;
            endPage = currentPage + maxPagesAfterCurrentPage;
        }
    }
    // calculate start and end item indexes
    var startIndex = (currentPage - 1) * pageSize;
    var endIndex = Math.min(startIndex + pageSize - 1, totalItems - 1);
    // create an array of pages to ng-repeat in the pager control
    var pages = Array.from(Array((endPage + 1) - startPage).keys()).map(function (i) { return startPage + i; });
    // return object with all pager properties required by the view
    return {
        totalItems: totalItems,
        currentPage: currentPage,
        pageSize: pageSize,
        totalPages: totalPages,
        startPage: startPage,
        endPage: endPage,
        startIndex: startIndex,
        endIndex: endIndex,
        pages: pages
    };
}
module.exports = paginate;