package com.ycxm.controller;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authz.AuthorizationException;
import org.apache.shiro.authz.UnauthorizedException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.ExceptionHandler;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.github.pagehelper.PageHelper;
import com.ycxm.pojo.SysUser;



public class BaseController {
	
	@Autowired
	private HttpServletRequest request;
	
	/**
	 * 分页查询
	 */
	protected void startPage() {
		String page = request.getParameter("page");
		String rows = request.getParameter("rows");
		String sort = request.getParameter("sort");
		String order= request.getParameter("order");
		String orderBy=null;
		if(order!=""&&order!=null) {
			orderBy = sort +" "+order;
		}
		
		Integer pageNum = 1;
		Integer pageSize = 10;
		if (page != null && page != "") {
			pageNum = Integer.parseInt(page);
		}
		if (rows != null && rows != "") {
			pageSize = Integer.parseInt(rows);
		}
		PageHelper.startPage(pageNum, pageSize,orderBy);
	};
	
	/**
	 * 获取当前用户
	 * @return
	 */
	public static SysUser getCurrentUser() {
		  SysUser user= (SysUser) SecurityUtils.getSubject().getPrincipal();
		  return user;
	}
	
	
	@ExceptionHandler({ UnauthorizedException.class, AuthorizationException.class })
    public String authorizationException(HttpServletRequest request, HttpServletResponse response) {
        if (isAjaxRequest(request)) {
            // 输出JSON
            Map<String,Object> map = new HashMap<String,Object>();
            map.put("MSG", "-998");
            map.put("message", "无权限");
            writeJson(map, response);
            return null;
        } else {
            return "redirect:/403.do";
        }
    }

    /**
     * 输出JSON
     */
    private void writeJson(Map<String,Object> map, HttpServletResponse response) {
        PrintWriter out = null;
        ObjectMapper json = new ObjectMapper();
        try {
            response.setCharacterEncoding("UTF-8");
            response.setContentType("application/json; charset=utf-8");
            out = response.getWriter();
            out.write(json.writeValueAsString(map));
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (out != null) {
                out.close();
            }
        }
    }
    
    
    
    private  boolean isAjaxRequest(HttpServletRequest request) {
        String requestedWith = request.getHeader("x-requested-with");
        if (requestedWith != null && requestedWith.equalsIgnoreCase("XMLHttpRequest")) {
            return true;
        } else {
            return false;
        }
    }
	
	
}