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package cn.featherfly.web.pagination;

import javax.servlet.http.HttpServletRequest;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import cn.featherfly.common.lang.AssertIllegalArgument;
import cn.featherfly.common.lang.NumberUtils;
import cn.featherfly.common.structure.page.Pagination;
import cn.featherfly.common.structure.page.SimplePagination;

/**
 * 

 * SimplePaginationFactory
 * 

 * 
 * @author 钟冀
 */
public class RequestParameterPaginationFactory implements PaginationFactory{
    
    protected final Logger logger = LoggerFactory.getLogger(this.getClass());

	/**
	 * {@inheritDoc}
	 */
	@Override
	public Pagination create(HttpServletRequest request) {
		Object p = request.getParameter(pageNumberName);
		
		Integer pageNumber = NumberUtils.parse(p + "", defaultPageNumber);
		
		SimplePagination pagination = new SimplePagination();
		
		pagination.setPageNumber(pageNumber);
		
		pagination.setPageSize(getPageSize(request));
		
		return pagination;
	}
	
	private Integer getPageSize(HttpServletRequest request) {
		if (allowDaynmicPageSize) {
			Object ps = request.getParameter(pageSizeName);
			Integer pageSize = NumberUtils.parse(ps + "", defaultPageSize);
			if (pageSize > allowMaxPageSize) {
			    logger.debug("pageSize({}) > allowMaxPageSize({}), set pageSize = allowMaxPageSize");
			    pageSize = allowMaxPageSize;
			}
		}
		return defaultPageSize;
	}
	
//	private Integer getPageNumberSize(HttpServletRequest request) {
//		if (allowDaynmicPageNumberSize) {
//			Object ps = request.getParameter(pageNumberName);
//			return StringUtils.parse(ps + "", defaultPageNumberSize);
//		}
//		return defaultPageNumberSize;
//	}
	
	// ********************************************************************
	//	property
	// ********************************************************************
	
	private boolean allowDaynmicPageSize;
	
//	private boolean allowDaynmicPageNumberSize;
	
	// 每页显示数量
	private String pageSizeName = "_ps";
	
	// 第几页
	private String pageNumberName = "_p";
	
	// 显示分页页数的个数
//	private String pageNumberSizeName = "_pns";
	
	// 默认每页显示数量
	private Integer defaultPageSize = 10;
	
	// 默认显示分页页数的个数
	private Integer defaultPageNumberSize = 10;
	
	// 允许的每页显示最大数
	private Integer allowMaxPageSize = 10;
	
	// 默认显示的页
	private Integer defaultPageNumber = 1;

	/**
	 * 返回pageSizeName
	 * @return pageSizeName
	 */
	public String getPageSizeName() {
		return pageSizeName;
	}

	/**
	 * 设置pageSizeName
	 * @param pageSizeName pageSizeName
	 */
	public void setPageSizeName(String pageSizeName) {
		AssertIllegalArgument.isNotEmpty(pageSizeName, "pageSizeName不能为空");
		this.pageSizeName = pageSizeName;
	}

	/**
	 * 返回pageNumberName
	 * @return pageNumberName
	 */
	public String getPageNumberName() {
		return pageNumberName;
	}

	/**
	 * 设置pageNumberName
	 * @param pageNumberName pageNumberName
	 */
	public void setPageNumberName(String pageNumberName) {
		AssertIllegalArgument.isNotEmpty(pageNumberName, "pageNumberName不能为空");
		this.pageNumberName = pageNumberName;
	}

	/**
	 * 返回defaultPageSize
	 * @return defaultPageSize
	 */
	public Integer getDefaultPageSize() {
		return defaultPageSize;
	}

	/**
	 * 设置defaultPageSize
	 * @param defaultPageSize defaultPageSize
	 */
	public void setDefaultPageSize(Integer defaultPageSize) {
		AssertIllegalArgument.isNotEmpty(defaultPageSize, "defaultPageSize不能为空");
		this.defaultPageSize = defaultPageSize;
	}

	/**
	 * 返回defaultPageNumberSize
	 * @return defaultPageNumberSize
	 */
	public Integer getDefaultPageNumberSize() {
		return defaultPageNumberSize;
	}

	/**
	 * 设置defaultPageNumberSize
	 * @param defaultPageNumberSize defaultPageNumberSize
	 */
	public void setDefaultPageNumberSize(Integer defaultPageNumberSize) {
		AssertIllegalArgument.isNotEmpty(defaultPageNumberSize, "defaultPageNumberSize不能为空");
		this.defaultPageNumberSize = defaultPageNumberSize;
	}

	/**
	 * 返回defaultPageNumber
	 * @return defaultPageNumber
	 */
	public Integer getDefaultPageNumber() {
		return defaultPageNumber;
	}

	/**
	 * 设置defaultPageNumber
	 * @param defaultPageNumber defaultPageNumber
	 */
	public void setDefaultPageNumber(Integer defaultPageNumber) {
		AssertIllegalArgument.isNotEmpty(defaultPageNumber, "defaultPageNumber不能为空");
		this.defaultPageNumber = defaultPageNumber;
	}

	/**
	 * 返回allowDaynmicPageSize
	 * @return allowDaynmicPageSize
	 */
	public boolean isAllowDaynmicPageSize() {
		return allowDaynmicPageSize;
	}

	/**
	 * 设置allowDaynmicPageSize
	 * @param allowDaynmicPageSize allowDaynmicPageSize
	 */
	public void setAllowDaynmicPageSize(boolean allowDaynmicPageSize) {
		this.allowDaynmicPageSize = allowDaynmicPageSize;
	}

    /**
     * 返回allowMaxPageSize
     * @return allowMaxPageSize
     */
    public Integer getAllowMaxPageSize() {
        return allowMaxPageSize;
    }

    /**
     * 设置allowMaxPageSize
     * @param allowMaxPageSize allowMaxPageSize
     */
    public void setAllowMaxPageSize(Integer allowMaxPageSize) {
        this.allowMaxPageSize = allowMaxPageSize;
    }
}
    

    

    

            

    

            



    
    






    
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