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package com.sap.it.commons.tools;

import java.util.regex.Pattern;

public class StringTools {
    private StringTools() {
    }

    public static final String LINE_SAPARATOR = System.getProperty("line.separator");

    public static final Pattern LINE_SAPARATOR_PATTERN = Pattern.compile(LINE_SAPARATOR);

    public static final String EMPTY_STRING = "";
    
    public static String[] EMPTY_STRING_ARRAY = new String[0];

    public static boolean hasContent(String data) {
        return data != null && !data.isEmpty();
    }

    public static boolean isEmpty(String data) {
        return data == null || data.isEmpty();
    }

    public static String nullify(String data) {
        return isEmpty(data) ? null : data;
    }

    public static String emptyfy(String data) {
        return data == null ? EMPTY_STRING : data;
    }

    public static String trimLeading(String data, String trim) {
        if (isEmpty(trim)) {
            return data;
        }

        if (data == null) {
            return null;
        }

        if (data.startsWith(trim)) {
            return data.substring(trim.length());
        } else {
            return data;
        }
    }

    public static String trimTrailing(String data, String trim) {
        if (isEmpty(trim)) {
            return data;
        }

        if (data == null) {
            return null;
        }

        if (data.endsWith(trim)) {
            return data.substring(0, data.length() - trim.length());
        } else {
            return data;
        }
    }

    public static String grantPrefix(String data, String prefix) {
        if (isEmpty(prefix)) {
            return data;
        }

        if (data == null) {
            return prefix;
        }

        if (data.startsWith(prefix)) {
            return data;
        } else {
            return prefix + data;
        }
    }

    public static String prefix(String data, String prefix) {
        if (isEmpty(prefix)) {
            return data;
        }

        if (data == null) {
            return prefix;
        }

        return prefix + data;
    }

    public static String grantSuffix(String data, String suffix) {
        if (isEmpty(suffix)) {
            return data;
        }

        if (data == null) {
            return suffix;
        }

        if (data.endsWith(suffix)) {
            return data;
        } else {
            return data + suffix;
        }
    }

    public static String limit(String data, int maxLength) {
        if (data == null || data.length() <= maxLength) {
            return data;
        }
        return data.substring(0, maxLength);
    }

    public static String serialize(Object object) {
        if (object == null) {
            return EMPTY_STRING;
        }
        String res = object.toString();
        return res != null ? res : EMPTY_STRING;
    }

    public static int length(String data) {
        return data != null ? data.length() : 0;
    }

    public static String defaultIfEmpty(String data, String defaultValue) {
        return isEmpty(data) ? defaultValue : data;
    }

    public static String textBefore(String data, char terminal) {
        if (isEmpty(data)) {
            return data;
        }
        int pos = data.indexOf(terminal);
        if (pos == -1) {
            return data;
        } else {
            return data.substring(0, pos);
        }
    }

    /**
     * Method to prevent compiler inlining for Strings
     * 
     * @param data
     * @return data
     * 
     * @since 0.1.0
     */
    public static String noConst(String data) {
        return data;
    }

    public static String join(Object[] array, String separator, int startIndex, int endIndex) {
        if (array == null) {
            return null;
        }
        if (separator == null) {
            separator = EMPTY_STRING;
        }

        // endIndex - startIndex > 0:   Len = NofStrings *(len(firstString) + len(separator))
        //           (Assuming that all Strings are roughly equally long)
        int bufSize = (endIndex - startIndex);
        if (bufSize <= 0) {
            return EMPTY_STRING;
        }

        bufSize *= ((array[startIndex] == null ? 16 : array[startIndex].toString().length())
                        + separator.length());

        StringBuilder stringBuilder = new StringBuilder(bufSize);

        for (int i = startIndex; i < endIndex; i++) {
            if (i > startIndex) {
                stringBuilder.append(separator);
            }
            if (array[i] != null) {
                stringBuilder.append(array[i]);
            }
        }
        return stringBuilder.toString();
    }
    
    public static String join(Object[] array, String separator) {
        if (array == null) {
            return null;
        }
        return join(array, separator, 0, array.length);
    }
}