package com.lf.server.service.data;

import com.lf.server.entity.data.MetaFileEntity;
import com.lf.server.helper.FileHelper;
import com.lf.server.helper.PathHelper;
import com.lf.server.helper.StringHelper;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.support.StandardMultipartHttpServletRequest;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.lang.reflect.Field;
import java.sql.Timestamp;
import java.util.*;

/**
 * 数据上传服务类
 * @author WWW
 */
@Service
public class UploaderService {
    @Autowired
    PathHelper pathHelper;

    private final static Log log = LogFactory.getLog(UploaderService.class);

    /**
     * 上传文件
     */
    public <T> List<MetaFileEntity> uploadData(T t, String path, HttpServletRequest req, HttpServletResponse res) throws Exception {
        StandardMultipartHttpServletRequest request = (StandardMultipartHttpServletRequest) req;
        req.setCharacterEncoding("utf-8");
        res.setContentType("application/json;charset=utf-8");

        if (t != null) {
            setEntity(t, request);
        }
        List<MetaFileEntity> list = getFiles(path,request);

        return list;
    }

    /**
     * 设置实体类
     * class<T> clazz
     * T t = clazz.newInstance();
     */
    private <T> void setEntity(T t, StandardMultipartHttpServletRequest req) {
        Enumeration<String> enumeration = req.getParameterNames();
        while (enumeration.hasMoreElements()) {
            String key = enumeration.nextElement();

            try {
                Field field = t.getClass().getDeclaredField(key);
                if (field != null) {
                    field.setAccessible(true);
                    String value = req.getParameter(key);

                    switch (field.getType().toString()) {
                        case "double":
                            field.set(t, Double.valueOf(value));
                            break;
                        case "long":
                            field.set(t, Long.valueOf(value));
                            break;
                        case "int":
                            field.set(t, Integer.valueOf(value));
                            break;
                        case "class java.sql.Timestamp":
                            field.set(t, Timestamp.valueOf(value));
                            break;
                        //case "class java.lang.String":
                        default:
                            field.set(t, value);
                            break;
                    }
                }
            } catch (Exception ex) {
                log.error(ex.getMessage(), ex);
            }
        }
    }

    /**
     * 获取文件
     */
    private List<MetaFileEntity> getFiles(String subPath,StandardMultipartHttpServletRequest req) throws Exception {
        List<MetaFileEntity> list = new ArrayList<MetaFileEntity>();

        String path = pathHelper.getTempPath(subPath);
        Iterator<String> iterator = req.getFileNames();
        while (iterator.hasNext()) {
            MultipartFile file = req.getFile(iterator.next());
            if (StringHelper.isEmpty(file.getOriginalFilename())) {
                continue;
            }

            double sizes = FileHelper.sizeToMb(file.getSize());
            MetaFileEntity mf = new MetaFileEntity();
            mf.setName(file.getOriginalFilename());
            mf.setSizes(sizes);
            mf.setPath(path + File.separator + mf.getName());

            file.transferTo(new File(mf.getPath()));
            mf.setGuid(FileHelper.getFileMd5(mf.getPath()));

            list.add(mf);
        }

        return list;
    }

    /**
     * 自理实体集合
     */
    public void dealEntities(List<MetaFileEntity> list) {
        for (MetaFileEntity entity : list) {
            entity.setPath(FileHelper.getRelativePath(entity.getPath()));
        }
    }

    /**
     * 删除文件
     * @param list 实体集合
     * @return
     */
    public Integer deleteFiles(List<MetaFileEntity> list){
        String root=pathHelper.getConfig().getTempPath();

        int count = 0;
        for (MetaFileEntity entity : list) {
            if (!StringHelper.isEmpty(entity.getPath())){
                String file=root+File.separator+entity.getPath();

                File f=new File(file);
                if (f.exists()){
                    f.delete();
                    count++;
                }
            }
        }

        return count;
    }

    /**
     * 获取参数
     * Enumeration<String> headers = req.getHeaderNames();
     * Enumeration<String> attributes = req.getAttributeNames();
     */
    private Map<String, String> getParams(StandardMultipartHttpServletRequest req) {
        Map<String, String> map = new HashMap<String, String>(3);

        Enumeration<String> enumeration = req.getParameterNames();
        while (enumeration.hasMoreElements()) {
            String key = enumeration.nextElement();
            String value = req.getParameter(key);
            map.put(key, value);
        }

        return map;
    }
}