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package cn.ipokerface.weixin.model.page;

import java.io.Serializable;

/**
 * Created by       PokerFace
 * Create Date      2019-12-28.
 * Email:           [email protected]
 * Version          1.0.0
 * 
 * Description:
 */
public class Pageable implements Serializable {

    private static final long serialVersionUID = -8051554878205756307L;

    private final int page;
    private final int size;
    private Sort sort;

    /**
     *
     * @param page
     *            must not be less than one.
     * @param size
     *            must not be less than one.
     */
	public Pageable(int page, int size) {
        if (page < 1) {
            throw new IllegalArgumentException(
                    "Page index must not be less than one!");
        }
        if (size < 1) {
            throw new IllegalArgumentException(
                    "Page size must not be less than one!");
        }
        this.page = page;
        this.size = size;
    }

	public Pageable(int page, int size, Sort.Direction direction,
            String... properties) {
        this(page, size, new Sort(direction, properties));
    }

	public Pageable(int page, int size, Sort sort) {
        this.page = page;
        this.size = size;
        this.sort = sort;
    }

    /**
     * page=1,size=20
     *
     * @return
     */
    public static Pageable get() {
        return new Pageable(1, 20);
    }

    public int getPageSize() {
        return size;
    }

    public int getPageNumber() {
        return page;
    }

    public Sort getSort() {
        return sort;
    }

    public void setSort(Sort sort) {
        this.sort = sort;
    }

    public int getOffset() {
        return (page - 1) * size;
    }

    public boolean hasPrevious() {
        return page > 1;
    }

    public Pageable next() {
        return new Pageable(getPageNumber() + 1, getPageSize(), getSort());
    }

    public Pageable previous() {
        return getPageNumber() == 1 ? this : new Pageable(getPageNumber() - 1,
                getPageSize(), getSort());
    }

    public Pageable first() {
        return new Pageable(1, getPageSize(), getSort());
    }

    @Override
    public String toString() {
        return "Pageable [page=" + page + ", size=" + size + ", sort=" + sort
                + "]";
    }
}