package com.csj2018.o2o.web.shopadmin;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

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.ResponseBody;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.multipart.MultipartRequest;
import org.springframework.web.multipart.commons.CommonsMultipartFile;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;

import com.csj2018.o2o.dto.ImageHolder;
import com.csj2018.o2o.dto.ProductExecution;
import com.csj2018.o2o.entity.Product;
import com.csj2018.o2o.entity.Shop;
import com.csj2018.o2o.enums.ProductStateEnum;
import com.csj2018.o2o.service.ProductService;
import com.csj2018.o2o.util.CodeUtil;
import com.csj2018.o2o.util.HttpServletRequestUtil;
import com.fasterxml.jackson.databind.ObjectMapper;

@Controller("/shopadmin")
public class ProductManagementController {
    @Autowired
    private ProductService productService;
    
    //支持上传图片详情图的最大数值
    private static final int IMAGEMAXCOUNT = 6;
    
    @RequestMapping(value="/addproduct",method=RequestMethod.POST)
    @ResponseBody
    private Map<String,Object> addProduct(HttpServletRequest request){
        Map<String, Object> modelMap = new HashMap<String,Object>();
        //验证码校验
        if(!CodeUtil.checkVerifyCode(request)) {
            modelMap.put("success", false);
            modelMap.put("errMsg", "输入了错误的验证码");
            return modelMap;
        }
        //接收前端参数的变量的初始化，包括商品、缩略图、详情图列表实体类
        ObjectMapper mapper = new ObjectMapper();
        Product product = null;
        String productStr = HttpServletRequestUtil.getString(request, "productStr");
        MultipartHttpServletRequest multipartRequest = null;
        ImageHolder thumbnail = null;
        List<ImageHolder> productImgList = new ArrayList<ImageHolder>();
        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());
        
        try {
            //若请求中存在文件流，则取出相关的文件（包括缩略图和详情图）
            if(multipartResolver.isMultipart(request)) {
                multipartRequest = (MultipartHttpServletRequest) request;
                //取出缩略图并构建ImageHolder的对象
                CommonsMultipartFile thumbnailFile = (CommonsMultipartFile) multipartRequest.getFile("thumbnail");
                thumbnail = new ImageHolder(thumbnailFile.getOriginalFilename(),thumbnailFile.getInputStream());
                //取出详情图列表并构建List<ImageHolder>列表对象，最多支持6张图片上传
                for(int i=0;i<IMAGEMAXCOUNT;i++) {
                    CommonsMultipartFile productImgFile = (CommonsMultipartFile)multipartRequest.getFile("productImg"+i);
                    if(productImgFile != null) {
                        //若取出的第i个详情图片文件流不为空，则将其加入详情图列表
                        ImageHolder productImg = new ImageHolder(productImgFile.getOriginalFilename(),productImgFile.getInputStream());
                        productImgList.add(productImg);
                    }else {
                        //若取出的第i个详情图片文件流为空，则终止循环
                        break;
                    }
                }
            }else {
                modelMap.put("success", false);
                modelMap.put("errMsg", "上传图片不为空");
                return modelMap;
            }
        }catch (Exception e) {
            modelMap.put("success", false);
            modelMap.put("errMsg", e.toString());
            return modelMap;
        }
        
        try {
            //
            product = mapper.readValue(productStr,Product.class);
            
        }catch(Exception e) {
            modelMap.put("success", false);
            modelMap.put("errMsg", e.toString());
            return modelMap;
        }
        //若product信息，缩略图、详情图不为空，则开始进行商品添加操作
        if(product != null && thumbnail != null &&productImgList.size() != 0) {
            try {
                //从session中获取当前店铺的ID，并赋值给product，减少对前端数据的依赖
                Shop currentShop = (Shop) request.getSession().getAttribute("currentShop");
                Shop shop = new Shop();
                shop.setShopId(currentShop.getShopId());
                product.setShop(shop);
                //执行添加操作
                ProductExecution pe = productService.addProduct(product, thumbnail, productImgList);
                if(pe.getState() == ProductStateEnum.SUCCESS.getState()) {
                    modelMap.put("success", true);
                }else {
                    modelMap.put("success", false);
                    modelMap.put("errMsg", pe.getStateInfo());
                }
            }catch (RuntimeException e) {
                modelMap.put("success", false);
                modelMap.put("errMsg", e.toString());
                return modelMap;
            }
        }else {
            modelMap.put("success",false);
            modelMap.put("errMsg", "请输入商品信息");
        }
        return modelMap;
    }
}