package com.fuzamei.service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.fuzamei.dao.AttachmentDao;

@Service
public class AttachmentService {
	
	@Autowired
	private AttachmentDao attachmentDao;
	
	public int generateAtachmentId(){
		int same = -1;
		Integer attachmentId = null;
		//如果有重复的继续查，直到查不出重复的fundId号为止
		while(same != 0){
			attachmentId=(int)(Math.random()*1000000000);								//=========================>>>产生附件id号的机制要改的TODO
			same = attachmentDao.queryIfHasTheSameAttachmentId(attachmentId);
		}
		return attachmentId;
	}
	
	/**
	 * 
	* @Title: generateMultiAttachmentIds
	* @Description: TODO(一次性生成多个附件id值)
	* @param @param n
	* @param @return    设定文件
	* @return List<Integer>    返回类型
	* @author ylx
	* @date 2018年1月2日 下午8:23:50
	* @throws
	 */
	public List<Integer> generateMultiAttachmentIds(int n){
		while(true){
			Set<Integer> set=new HashSet<Integer>();
			for (int i = 0; i < n; i++) {
				Integer attachmentId=(int)(Math.random()*1000000000);								//=========================>>>产生附件id号的机制要改的TODO
				set.add(attachmentId);
			}
			if(set.size()!=n){
				continue;
			}
			int same = attachmentDao.queryIfHasTheSameAttachmentIdS(set);
			if(same==0){
				List<Integer> list = new ArrayList<Integer>();
				for (Integer integer : set) {
					list.add(integer);
				}
				return list;
			}
		}
		
	}
}