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/*
 * Copyright 2019 Web3 Labs Ltd.
 *
 * 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.tron.trident.utils;

import java.util.List;

/** String utility functions. */
public class Strings {

    private Strings() {}

    public static String toCsv(List src) {
        // return src == null ? null : String.join(", ", src.toArray(new String[0]));
        return join(src, ", ");
    }

    public static String join(List src, String delimiter) {
        return src == null ? null : String.join(delimiter, src.toArray(new String[0]));
    }

    public static String capitaliseFirstLetter(String string) {
        if (string == null || string.length() == 0) {
            return string;
        } else {
            return string.substring(0, 1).toUpperCase() + string.substring(1);
        }
    }

    public static String lowercaseFirstLetter(String string) {
        if (string == null || string.length() == 0) {
            return string;
        } else {
            return string.substring(0, 1).toLowerCase() + string.substring(1);
        }
    }

    public static String zeros(int n) {
        return repeat('0', n);
    }

    public static String repeat(char value, int n) {
        return new String(new char[n]).replace("\0", String.valueOf(value));
    }

    public static boolean isEmpty(String s) {
        return s == null || s.length() == 0;
    }
}