package com.company;

import java.util.Arrays;

public class IntArrayList implements IntList {

    private int[] arr = new int[10];
    private int size = 0;

    @Override
    public void add(int element) {
        if (size >= arr.length) {
            int newSize = arr.length * 3 / 2 + 1;
            int[] newArr = new int[newSize];
            for (int i = 0; i < size; i++) {
                newArr[i] = arr[i];
            }
            arr = newArr;
        }
        arr[size] = element;
        size++;
    }

    @Override
    public boolean add(int index, int element) {

        if (size + 1 > arr.length) {
            int newSize = arr.length * 3 / 2 + 1;
            int[] newArr = new int[newSize];
            for (int i = 0; i < size; i++) {
                newArr[i] = arr[i];
            }
            arr = newArr;
        }
        int[] arr2 = new int[arr.length];
        System.arraycopy(arr, index, arr2, index + 1, size - index);
        arr2[index] = element;
        System.arraycopy(arr, 0, arr2, 0, index);
        arr = arr2;
        size++;
        return false;
    }

    @Override
    public void clear() {
        int[] newArr = new int[arr.length];
        arr = newArr;
        size = 0;
    }

    @Override
    public int get(int index) {
        return arr[index];
    }

    @Override
    public boolean isEmpty() {
        int counter = 0;
        for (int i = 0; i < arr.length; i++) {
            if (arr[i] != 0) {
                counter++;
            }
        }
        if (counter == 0) {
            return true;
        } else {
            return false;
        }
    }

    @Override
    public boolean remove(int index) {
        int newSize = size - index - 1;
        int[] newArr = new int[arr.length];
        System.arraycopy(arr, index + 1, newArr, index, newSize);
        System.arraycopy(arr, 0, newArr, 0, index);
        arr = newArr;
        size--;
        return false;
    }

    @Override
    public boolean removeByValue(int value) {
        int index = 0;
        for (int i = 0; i < arr.length; i++) {
            if (arr[i] == value) {
                index = i;
            }
        }
        int newSize = size - index - 1;
        int[] newArr = new int[arr.length];
        System.arraycopy(arr, index + 1, newArr, index, newSize);
        System.arraycopy(arr, 0, newArr, 0, index);
        arr = newArr;
        size--;
        return false;
    }

    @Override
    public boolean set(int index, int element) {
        arr[index] = element;
        return false;
    }

    @Override
    public int size() {
        return size;
    }

    @Override
    public IntList subList(int fromIndex, int toIndex) {
        int[] newArr = new int[arr.length];
        int newSize = toIndex - fromIndex + 1;
        System.arraycopy(arr, fromIndex, newArr, 0, newSize);
        arr = newArr;
        size = newSize;
        return null;
    }

    @Override
    public int[] toArray() {
        int[] result = new int[size];
        for (int i = 0; i < size; i++) {
            result[i] = arr[i];
        }
        return result;
    }

    @Override
    public String toString() {
        return Arrays.toString(toArray());
    }

}