package com.yahoo.labs.samoa.instances;

/*
 * #%L
 * SAMOA
 * %%
 * Copyright (C) 2014 - 2015 Apache Software Foundation
 * %%
 * 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.
 * #L%
 */

public class Utils {
  public static int maxIndex(double[] doubles) {

    double maximum = 0;
    int maxIndex = 0;

    for (int i = 0; i < doubles.length; i++) {
      if ((i == 0) || (doubles[i] > maximum)) {
        maxIndex = i;
        maximum = doubles[i];
      }
    }

    return maxIndex;
  }

  public static String quote(String string) {
    boolean quote = false;

    // backquote the following characters
    if ((string.indexOf('\n') != -1) || (string.indexOf('\r') != -1) || (string.indexOf('\'') != -1)
        || (string.indexOf('"') != -1)
        || (string.indexOf('\\') != -1) || (string.indexOf('\t') != -1) || (string.indexOf('%') != -1)
        || (string.indexOf('\u001E') != -1)) {
      string = backQuoteChars(string);
      quote = true;
    }

    // Enclose the string in 's if the string contains a recently added
    // backquote or contains one of the following characters.
    if ((quote == true) || (string.indexOf('{') != -1) || (string.indexOf('}') != -1) || (string.indexOf(',') != -1)
        || (string.equals("?"))
        || (string.indexOf(' ') != -1) || (string.equals(""))) {
      string = ("'".concat(string)).concat("'");
    }

    return string;
  }

  public static String backQuoteChars(String string) {

    int index;
    StringBuffer newStringBuffer;

    // replace each of the following characters with the backquoted version
    char charsFind[] = { '\\', '\'', '\t', '\n', '\r', '"', '%', '\u001E' };
    String charsReplace[] = { "\\\\", "\\'", "\\t", "\\n", "\\r", "\\\"", "\\%", "\\u001E" };
    for (int i = 0; i < charsFind.length; i++) {
      if (string.indexOf(charsFind[i]) != -1) {
        newStringBuffer = new StringBuffer();
        while ((index = string.indexOf(charsFind[i])) != -1) {
          if (index > 0) {
            newStringBuffer.append(string.substring(0, index));
          }
          newStringBuffer.append(charsReplace[i]);
          if ((index + 1) < string.length()) {
            string = string.substring(index + 1);
          } else {
            string = "";
          }
        }
        newStringBuffer.append(string);
        string = newStringBuffer.toString();
      }
    }

    return string;
  }
}