package com.hp.school.controller;

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

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

import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;

import com.hp.school.entity.User;
import com.hp.school.service.UserService;
import com.hp.school.utils.CpachaUtil;

/**
 * 控制器 --  等同于 struts2
 * 分模块开发 -- 为了区分不同的 模块 /system  路径
 */
@Controller
@RequestMapping("/system")
public class SystemController {
	
	@Autowired
	private UserService userService;

	/**
	 * 测试 工程
	 * @param model
	 * @return
	 */
	@RequestMapping(value="/index",method=RequestMethod.GET)
	public ModelAndView index(ModelAndView model){
		model.addObject("key", "dddddddddddd");
		model.setViewName("system/index");
		return model;
	}
	
	
	/**
	 * 跳转到 login.jsp
	 * @return
	 */
	@RequestMapping(value="/login",method=RequestMethod.GET)
	public ModelAndView toLogin(ModelAndView model){
		model.setViewName("system/login");
		return model;
	}
	
	@RequestMapping(value="/vcode",method=RequestMethod.GET)
	public void get_cpacha(
			HttpServletResponse response,
			HttpServletRequest request,
			@RequestParam(name="vl",defaultValue="4",required=false) Integer vl,
			@RequestParam(name="w",defaultValue="98",required=false) Integer w,
			@RequestParam(name="h",defaultValue="33",required=false) Integer h
			){
		//1. 创建验证码 对象 
		CpachaUtil cpachaUtil = new CpachaUtil(vl,w,h);
		//2. 生成验证码
		String generatorVCode = cpachaUtil.generatorVCode();
		request.getSession().setAttribute("code", generatorVCode);//存入session
		
		//3. 生成背景图
		BufferedImage generatorVCodeImage = cpachaUtil.generatorVCodeImage(generatorVCode, true);
		
		//4. 将 generatorVCodeImage 返回到jsp页面
		try {
			ImageIO.write(generatorVCodeImage, "gif", response.getOutputStream());
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	
	/**
	 * 登陆
	 * @return   Map<String,String>  用map原因,方便 将后台数据 反馈给jsp
	 */
	@RequestMapping(value="/login",method=RequestMethod.POST)
	@ResponseBody	//返回json数据   
	public Map<String,String> login(
			HttpServletRequest request,
			@RequestParam(name="username",required=true) String username,
			@RequestParam(name="password",required=true) String password,
			@RequestParam(name="vcode",required=true) String vcode,
			@RequestParam(name="type",required=true) int type
			){
		Map<String,String> map = new HashMap<String, String>();
		
		//后台验证 
		if(StringUtils.isEmpty(username)){	//判断用户名是否为空
			map.put("type", "error");
			map.put("msg", "用户名不能为空!");
			return map;
		}
		if(StringUtils.isEmpty(password)){	
			map.put("type", "error");
			map.put("msg", "密码不能为空!");
			return map;
		}
		
		if(StringUtils.isEmpty(vcode)){	//判断用户名是否为空
			map.put("type", "error");
			map.put("msg", "验证码不能为空!");
			return map;
		}
		
		//在session中取出验证码
		String code = (String) request.getSession().getAttribute("code");
		if(StringUtils.isEmpty(code)){	
			map.put("type", "error");
			map.put("msg", "长时间未操作,验证码失效!");
			return map;
		}
		
		
		if(!vcode.toUpperCase().equals(code.toUpperCase())){
			map.put("type", "error");
			map.put("msg", "验证码错误!");
			return map;
		}
		
		//TODO 访问数据库 
		// 清空session中 存的 验证码
		request.getSession().setAttribute("code", null);
		
		if(type==1){	//管理员
			User user = userService.findUserByUserName(username);
			if(user==null){
				map.put("type", "error");
				map.put("msg", "该用户不存在!");
				return map;
			}
			//验证密码
			if(!password.equals(user.getPassword())){
				map.put("type", "error");
				map.put("msg", "密码错误!");
				return map;
			}
			
			//用户没问题可以查询到 ,存入session
			request.getSession().setAttribute("user", user);
		}else{
			//TODO  学生登陆
			System.out.println("学生登陆.......");
		}
		
		map.put("type", "success");
		map.put("msg", "用户登陆成功!");
		return map;
	}
}