package com.farriver.bwf.common.utilities;

import org.springframework.util.CollectionUtils;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;

public class ListUtils {
    public static <T> List<T> pagination(List<T> records, int pageindex, int pagesize) {
        if (CollectionUtils.isEmpty(records)) {
            return Collections.emptyList();
        }
        if (pageindex < 0 || pagesize < 0) {
            return Collections.emptyList();
        }
        int totalcount = records.size();
        long remainder = totalcount % pagesize;
        long pagecount = (remainder > 0) ? totalcount / pagesize + 1 : totalcount / pagesize;

        if (remainder != 0 && pageindex == pagecount) {
            records = records.stream().skip((pageindex - 1) * pagesize).limit(totalcount).collect(Collectors.toList());
        } else {
            records = records.stream().skip((pageindex - 1) * pagesize).limit(pagesize).collect(Collectors.toList());
        }

        return records;
    }

    public static Object[] ArrayInster(Object[] array, int index, Object value) {
        Object[] newArray = new Object[array.length + 1];

        for (int i = 0; i < array.length; i++) {
            newArray[i] = array[i];
        }

        for (int i = newArray.length - 1; i > index; i--) {
            newArray[i] = newArray[i - 1];
        }

        newArray[index] = value;
        array = newArray;

        return array;
    }

    public static List<Object> ListInster(List<Object> array, int index, Object value) {
        Object[] newArray = new Object[array.size() + 1];

        for (int i = 0; i < array.size(); i++) {
            newArray[i] = array.get(i);
        }

        for (int i = newArray.length - 1; i > index; i--) {
            newArray[i] = newArray[i - 1];
        }

        newArray[index] = value;
        array = Arrays.asList(newArray);

        return array;
    }

    public static List<Object> ListInsterLast(List<Object> array, Object value) {
        Object[] newArray = new Object[array.size() + 1];

        for (int i = 0; i < array.size(); i++) {
            newArray[i] = array.get(i);
        }

        newArray[array.size()] = value;
        array = Arrays.asList(newArray);

        return array;
    }
}