class NumberUtils {
    //格式化为千分位
    /*
     * 参数说明：
     * money：要格式化的数字
     * decimal：保留几位小数
     * */
    formatCurrency(money: any, decimal: number): string {
        decimal = decimal > 0 && decimal <= 20 ? decimal : 2;
        money =
            parseFloat((money + "").replace(/[^\d\.-]/g, "")).toFixed(decimal) +
            "";
        var l = money
                .split(".")[0]
                .split("")
                .reverse(),
            r = money.split(".")[1];
        let t: string = "";
        for (let i: number = 0; i < l.length; i++) {
            t += l[i] + ((i + 1) % 3 == 0 && i + 1 != l.length ? "," : "");
        }
        return (
            t
                .split("")
                .reverse()
                .join("") +
            "." +
            r
        );
    }

    //利率*100，用来展示数据
    multiplyBy100(rate: string, decimal: number): string {
        return this.formatCurrency(Number(rate) * 100, decimal);
    }

    //利率/100，用来向后台传数据
    divideBy100(rate: string, decimal: number): string {
        return this.formatCurrency(Number(rate) / 100, decimal);
    }

    // 数字金额大写转换(可以处理整数,小数,负数)
    smalltoBIG(n: number) {
        var fraction = ["角", "分"];
        var digit = [
            "零",
            "壹",
            "贰",
            "叁",
            "肆",
            "伍",
            "陆",
            "柒",
            "捌",
            "玖"
        ];
        var unit = [["元", "万", "亿"], ["", "拾", "佰", "仟"]];
        var head = n < 0 ? "欠" : "";
        n = Math.abs(n);

        var s = "";

        for (var i = 0; i < fraction.length; i++) {
            s += (
                digit[Math.floor(n * 10 * Math.pow(10, i)) % 10] + fraction[i]
            ).replace(/零./, "");
        }
        s = s || "整";
        n = Math.floor(n);

        for (var i = 0; i < unit[0].length && n > 0; i++) {
            var p = "";
            for (var j = 0; j < unit[1].length && n > 0; j++) {
                p = digit[n % 10] + unit[1][j] + p;
                n = Math.floor(n / 10);
            }
            s = p.replace(/(零.)*零$/, "").replace(/^$/, "零") + unit[0][i] + s;
        }
        return (
            head +
            s
                .replace(/(零.)*零元/, "元")
                .replace(/(零.)+/g, "零")
                .replace(/^整$/, "零元整")
        );
    }
}

let numberUtils: NumberUtils = new NumberUtils();
export default numberUtils;