import java.util.Arrays;

/**
 * Created by leon on 1/29/18.
 */
public class StringArrayUtils {
    /**
     * @param array array of String objects
     * @return first element of specified array
     */ // TODO
    public static String getFirstElement(String[] array) {
        return array[0];

    }

    /**
     * @param array array of String objects
     * @return second element in specified array
     */
    public static String getSecondElement(String[] array) {
        return array[1];
    }

    /**
     * @param array array of String objects
     * @return last element in specified array
     */ // TODO
    public static String getLastElement(String[] array) {
        return array[array.length-1];
    }

    /**
     * @param array array of String objects
     * @return second to last element in specified array
     */ // TODO
    public static String getSecondToLastElement(String[] array) {
        return array[array.length-2];
    }

    /**
     * @param array array of String objects
     * @param value value to check array for
     * @return true if the array contains the specified `value`
     */ // TODO
    public static boolean contains(String[] array, String value) {
        boolean answer = false;
        for (String string : array) {
            if (string.equalsIgnoreCase(value));
            answer = true;
        }
        return answer;
    }

    /**
     * @param array of String objects
     * @return an array with identical contents in reverse order
     */ // TODO
    public static String[] reverse(String[] array) {
        String[] answer = new String[array.length];

        for (int i = 0; i< array.length; i++)
            answer[i] = array[array.length-1-i];

        return answer;
    }

    /**
     * @param array array of String objects
     * @return true if the order of the array is the same backwards and forwards
     */ // TODO
    public static boolean isPalindromic(String[] array) {
        boolean answer = false;
        for (int i = 0; i < array.length; i++)
            if (Arrays.equals(array, reverse(array))){
                answer = true;
            }
        return answer;
    }

    /**
     * @param array array of String objects
     * @return true if each letter in the alphabet has been used in the array
     */ // TODO
    public static boolean isPangramic(String[] array) {

        boolean isPangramic = false;
        for (char i = 'A' ; i <= 'Z'; i++)
            if (Arrays.toString(array).indexOf(i) < 0 && (Arrays.toString(array).indexOf((char) i +32) < 0)) {
                isPangramic = false;
                break;
            } else {
                isPangramic = true;
            }

        return isPangramic;
    }

    /**
     * @param array array of String objects
     * @param value value to check array for
     * @return number of occurrences the specified `value` has occurred
     */ // TODO
    public static int getNumberOfOccurrences(String[] array, String value) {
        int count = 0;
        for (String s: array) {
            if (value.equals(s)) {
                count ++;
            }
        }
        return count;     
    }

    /**
     * @param array         array of String objects
     * @param valueToRemove value to remove from array
     * @return array with identical contents excluding values of `value`
     */ // TODO
    public static String[] removeValue(String[] array, String valueToRemove) {
        int index = 0;
        int count = getNumberOfOccurrences(array, valueToRemove);
        String[] newArray = new String[array.length-count];       
        for (int i = 0; i < array.length; i++) {
            if (array[i] != valueToRemove) {
                newArray[index] = array[i];
                index++;
            }        
        }    
        return newArray;
    }

    /**
     * @param array array of chars
     * @return array of Strings with consecutive duplicates removes
     */ // TODO
    public static String[] removeConsecutiveDuplicates(String[] array) {

        return null;
    }

    /**
     * @param array array of chars
     * @return array of Strings with each consecutive duplicate occurrence concatenated as a single string in an array of Strings
     */ // TODO
    public static String[] packConsecutiveDuplicates(String[] array) {
        return null;
    }

}