/*
 * strings.js
 */

var number_format = function(number, decimals, decPoint, thousandsSep) { // eslint-disable-line camelcase
    //  discuss at: https://locutus.io/php/number_format/
    // original by: Jonas Raoni Soares Silva (https://www.jsfromhell.com)
    // improved by: Kevin van Zonneveld (https://kvz.io)
    // improved by: davook
    // improved by: Brett Zamir (https://brett-zamir.me)
    // improved by: Brett Zamir (https://brett-zamir.me)
    // improved by: Theriault (https://github.com/Theriault)
    // improved by: Kevin van Zonneveld (https://kvz.io)
    // bugfixed by: Michael White (https://getsprink.com)
    // bugfixed by: Benjamin Lupton
    // bugfixed by: Allan Jensen (https://www.winternet.no)
    // bugfixed by: Howard Yeend
    // bugfixed by: Diogo Resende
    // bugfixed by: Rival
    // bugfixed by: Brett Zamir (https://brett-zamir.me)
    //  revised by: Jonas Raoni Soares Silva (https://www.jsfromhell.com)
    //  revised by: Luke Smith (https://lucassmith.name)
    //    input by: Kheang Hok Chin (https://www.distantia.ca/)
    //    input by: Jay Klehr
    //    input by: Amir Habibi (https://www.residence-mixte.com/)
    //    input by: Amirouche
    //   example 1: number_format(1234.56)
    //   returns 1: '1,235'
    //   example 2: number_format(1234.56, 2, ',', ' ')
    //   returns 2: '1 234,56'
    //   example 3: number_format(1234.5678, 2, '.', '')
    //   returns 3: '1234.57'
    //   example 4: number_format(67, 2, ',', '.')
    //   returns 4: '67,00'
    //   example 5: number_format(1000)
    //   returns 5: '1,000'
    //   example 6: number_format(67.311, 2)
    //   returns 6: '67.31'
    //   example 7: number_format(1000.55, 1)
    //   returns 7: '1,000.6'
    //   example 8: number_format(67000, 5, ',', '.')
    //   returns 8: '67.000,00000'
    //   example 9: number_format(0.9, 0)
    //   returns 9: '1'
    //  example 10: number_format('1.20', 2)
    //  returns 10: '1.20'
    //  example 11: number_format('1.20', 4)
    //  returns 11: '1.2000'
    //  example 12: number_format('1.2000', 3)
    //  returns 12: '1.200'
    //  example 13: number_format('1 000,50', 2, '.', ' ')
    //  returns 13: '100 050.00'
    //  example 14: number_format(1e-8, 8, '.', '')
    //  returns 14: '0.00000001'
    number = (number + '').replace(/[^0-9+\-Ee.]/g, '')
    const n = !isFinite(+number) ? 0 : +number
    const prec = !isFinite(+decimals) ? 0 : Math.abs(decimals)
    const sep = (typeof thousandsSep === 'undefined') ? ',' : thousandsSep
    const dec = (typeof decPoint === 'undefined') ? '.' : decPoint
    let s = ''
    const toFixedFix = function(n, prec) {
        if (('' + n).indexOf('e') === -1) {
            return +(Math.round(n + 'e+' + prec) + 'e-' + prec)
        } else {
            const arr = ('' + n).split('e')
            let sig = ''
            if (+arr[1] + prec > 0) {
                sig = '+'
            }
            return (+(Math.round(+arr[0] + 'e' + sig + (+arr[1] + prec)) + 'e-' + prec)).toFixed(prec)
        }
    }
    // @todo: for IE parseFloat(0.55).toFixed(0) = 0;
    s = (prec ? toFixedFix(n, prec).toString() : '' + Math.round(n)).split('.')
    if (s[0].length > 3) {
        s[0] = s[0].replace(/\B(?=(?:\d{3})+(?!\d))/g, sep)
    }
    if ((s[1] || '').length < prec) {
        s[1] = s[1] || ''
        s[1] += new Array(prec - s[1].length + 1).join('0')
    }
    return s.join(dec)
}

exports.number_format = number_format;