package com.docus.bgts.entity;

import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.util.StringUtils;

import java.io.*;

public class TableJsonRead {

    /**
     * 读取数据结构
     * @param path 路径后缀
     * @param fileName 文件名称
     * @return
     */
    public <T> T Read(String path,String fileName,Class<T> clazz){
        String currentPath=CurrentPath();
        path = currentPath+"\\"+path;
        StringBuilder sb = new StringBuilder();
        T dto =null;
        File file  = new File(path+"\\"+fileName);
        try {
            if (!file.exists()) {
                try {
                    file.createNewFile();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            } else {
                BufferedReader bufferedReader = null;
                bufferedReader = new BufferedReader(new InputStreamReader(new FileInputStream(file)));
                String line;
                while (!StringUtils.isEmpty(line = bufferedReader.readLine())) {
                    sb.append(line);
                }
                if (sb.length() > 0) {
                    ObjectMapper objectMapper = new ObjectMapper();
                    //dto = (T)JSONObject.parse(sb.toString());
                    dto= objectMapper.readValue(sb.toString(), clazz);
                    //dto = objectMapper.convertValue(o, new TypeReference<T>() { });
                }
                bufferedReader.close();
            }

            return dto;
        }
        catch (Exception ex){
            ex.printStackTrace();
            return null;
        }
    }
    /**
     * 取得当前jar路径
     * @return
     */
    private String CurrentPath(){
        File dir = new File(".");
        String currentpath ="";
        try {
            currentpath = dir.getCanonicalPath();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return currentpath;
    }


    /**
     * 保存json至文件
     * @param path 路径后缀
     * @param fileName 文件名称
     * @param data json信息
     * @return
     */
    public void Save(String path,String fileName,String data){
        String currentPath=CurrentPath();
        path = currentPath+"\\"+path;
        FileWriter fwriter = null;
        try {
            fwriter = new FileWriter(path+"\\"+fileName);
            fwriter.write(data);
        } catch (IOException ex) {
            ex.printStackTrace();
        } finally {
            try {
                fwriter.flush();
                fwriter.close();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }

}