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package com.jeesuite.mybatis.plugin.pagination;

import java.util.ArrayList;
import java.util.List;

import com.jeesuite.common.model.Page;
import com.jeesuite.common.model.PageParams;

public class PageExecutor {

	private static ThreadLocal pageParamsHolder = new ThreadLocal<>();
	
	public static interface PageDataLoader {
		List load();
	}
	
	public static interface ConvertPageDataLoader extends PageDataLoader{
		V convert(E e);
	}
	
	@SuppressWarnings("unchecked")
	private static  Page doPagination(PageParams pageParams,PageDataLoader dataLoader ){
		try {			
			pageParamsHolder.set(pageParams);
			List list = dataLoader.load();
			return (Page) list.get(0);
		} finally {
			pageParamsHolder.remove();
		}
	}
	
	public static  Page pagination(PageParams pageParams,PageDataLoader dataLoader ){
		return doPagination(pageParams, dataLoader);
	}
	
	public static  Page pagination(PageParams pageParams,ConvertPageDataLoader dataLoader ){
		
		Page page = doPagination(pageParams, dataLoader);
		List convertDatas = new ArrayList<>(page.getData().size());
		for (E e : page.getData()) {
			convertDatas.add(dataLoader.convert(e));
		}
		return new Page<>(pageParams, page.getTotal(), convertDatas);
	}
	
	public static PageParams getPageParams(){
		return pageParamsHolder.get();
	}
	
	public static void clearPageParams(){
		pageParamsHolder.remove();
	}
	
}