/**
 * 订单接口
 */
@RestController
@RequestMapping("/api/v1/order")
public class OrderController {

    @Autowired
    private VideoOrderService videoOrderService;

    /**
     * 用户点击购买下单接口
     */
    @GetMapping("buy")
    public void saveOrder(@RequestParam(value = "video_id",required = true)int videoId,
                              HttpServletRequest request,
                              HttpServletResponse response) throws Exception {

        /**
         * 实际开发需要获取用户id和用户当前ip，这里临时写死的配置
         * String ip = IpUtils.getIpAddr(request);
         * int userId = request.getAttribute("user_id");
         */
        int userId = 1;
        String ip = "120.25.1.43";
        //1、根据用户id和商品id生成订单
        VideoOrderDto videoOrderDto = new VideoOrderDto();
        videoOrderDto.setUserId(userId);
        videoOrderDto.setVideoId(videoId);
        videoOrderDto.setIp(ip);

        //2、保存订单同时返回codeUrl
        String codeUrl = videoOrderService.save(videoOrderDto);
        if(codeUrl == null) {
            throw new  NullPointerException();
        }

        //3、通过google工具生成二维码供用户扫码支付
         try{
            //3、1生成二维码配置
            Map<EncodeHintType,Object> hints =  new HashMap<>();

            //3、2设置纠错等级
            hints.put(EncodeHintType.ERROR_CORRECTION,ErrorCorrectionLevel.L);

            //3、3编码类型
            hints.put(EncodeHintType.CHARACTER_SET,"UTF-8");

            BitMatrix bitMatrix = new MultiFormatWriter().encode(codeUrl,BarcodeFormat.QR_CODE,400,400,hints);
            OutputStream out =  response.getOutputStream();

            MatrixToImageWriter.writeToStream(bitMatrix,"png",out);

        }catch (Exception e){
            e.printStackTrace();
        }
    }
}

    @Override
    @Transactional(propagation = Propagation.REQUIRED)
    public String save(VideoOrderDto videoOrderDto) throws Exception {

        //1、查找商品信息（这里商品指的是视频课程）
        Video video =  videoMapper.findById(videoOrderDto.getVideoId());

        //2、查找用户信息
        User user = userMapper.findByid(videoOrderDto.getUserId());

        //3、生成订单，插入数据库
        VideoOrder videoOrder = new VideoOrder();
        videoOrder.setTotalFee(video.getPrice());
        videoOrder.setVideoImg(video.getCoverImg());
        videoOrder.setVideoTitle(video.getTitle());
        videoOrder.setCreateTime(new Date());
        videoOrder.setVideoId(video.getId());
        videoOrder.setState(0);
        videoOrder.setUserId(user.getId());
        videoOrder.setHeadImg(user.getHeadImg());
        videoOrder.setNickname(user.getName());
        videoOrder.setDel(0);
        videoOrder.setIp(videoOrderDto.getIp());
        videoOrder.setOutTradeNo(CommonUtils.generateUUID());

        videoOrderMapper.insert(videoOrder);

        //4、获取codeurl
        String codeUrl = unifiedOrder(videoOrder);

        return codeUrl;
    }