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/*
 * Copyright 2015 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.glowroot.storage.repo;

import java.text.DecimalFormat;

public class Utils {

    private Utils() {}

    public static String getPercentileWithSuffix(double percentile) {
        String percentileText = new DecimalFormat("0.#########").format(percentile);
        return percentileText + getPercentileSuffix(percentileText);
    }

    private static String getPercentileSuffix(String percentileText) {
        if (percentileText.equals("11") || percentileText.endsWith(".11")) {
            return "th";
        } else if (percentileText.equals("12") || percentileText.endsWith(".12")) {
            return "th";
        } else if (percentileText.equals("13") || percentileText.endsWith(".13")) {
            return "th";
        }
        switch (percentileText.charAt(percentileText.length() - 1)) {
            case '1':
                return "st";
            case '2':
                return "nd";
            case '3':
                return "rd";
            default:
                return "th";
        }
    }

    public static long getNextRollupTime(long captureTime, long intervalMillis) {
        return (long) Math.ceil(captureTime / (double) intervalMillis) * intervalMillis;
    }
}