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package cn.ipokerface.weixin.model.page;

import java.io.Serializable;
import java.util.Iterator;
import java.util.List;

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

    private static final long serialVersionUID = 163159826528502864L;

    private final int total;
    private final Pageable pageable;
    private final List content;

    public PageData(Pageable pageable, int total, List content) {
        this.pageable = pageable;
        this.total = total;
        this.content = content;
    }

    public int getNumber() {
        return pageable == null ? 0 : pageable.getPageNumber();
    }

    public int getSize() {
        return pageable == null ? 0 : pageable.getPageSize();
    }

    public int getTotalPages() {
        return getSize() == 0 ? 1 : (int) Math.ceil((double) total
                / (double) getSize());
    }

    public int getTotalElements() {
        return total;
    }

    public int getNumberOfElements() {
        return hasContent() ? 0 : content.size();
    }

    public boolean hasContent() {
        return content != null && !content.isEmpty();
    }

    public boolean hasPrevious() {
        return pageable == null ? false : pageable.hasPrevious();
    }

    public boolean hasNext() {
        return getNumber() + 1 < getTotalPages();
    }

    public Sort getSort() {
        return pageable == null ? null : pageable.getSort();
    }

    public List getContent() {
        return content;
    }

    @Override
    public Iterator iterator() {
        return hasContent() ? content.iterator() : null;
    }

    @Override
    public String toString() {
        return "Pagedata [total=" + total + ", pageable=" + pageable + "]";
    }
}