const fs =require('fs');

/**
 * 新建目录
 * @param {*} dir 目录路径
 */
function mkdir(dir){
  fs.mkdirSync(dir,{recursive: true});
}

/**
 * 删除目录
 * @param {*} dir 目录
 */
function rm(dir){
  fs.rmSync(dir,{recursive: true});
}

function cp(src,target){
  fs.cpSync(src,target,{recursive: true});
}

/**
 * 解析 json 格式文件
 * @param {*} src 文件路径
 * @returns javascript 对象
 */
function parseJson(src){
  return JSON.parse(fs.readFileSync(src).toString());
}

/**
 * 替换文件中的字符串
 * @param {*} filePath 文件路径
 * @param {*} repalcer 替换字符 Map(key:需要替换的字符串,value:替换后的字符串)
 */
function replaceAll(filePath,repalcer){
  let content =fs.readFileSync(filePath,{encoding:'utf-8'});
  if(repalcer){
    for(const key in repalcer){
      content =content.replaceAll(key,repalcer[key]);
    }
  }
  fs.writeFileSync(filePath,content);
}

/**
 * 合并两个对象
 * @param {*} target 目标对象
 * @param {*} source 源对象
 * @returns 合并后的对象
 */
function mergeObject(target, source) {
  if (source && target) {
    for (const property in source) {
      const value = source[property];
      if (typeof value === 'object' && !Array.isArray(value)) {
        if (target[property] === null || typeof target[property] === 'undefined') {
          target[property] = {};
        }
        mergeObject(target[property], value);
      } else {
        if (value !== null && typeof value !== 'undefined') {
          target[property] = value;
        }
      }
    }
  }
  return target;
}

/**
 * 合并 json 文件
 * @param {*} targetPath 目标文件
 * @param {*} srcPath 源文件
 * @param {*} includeProperties 包含的需要合并的属性列表
 */
function mergeJsonFile(targetPath,srcPath,includeProperties){
  const target =parseJson(targetPath);
  const source =parseJson(srcPath);
  if(includeProperties && includeProperties.length>0){
    for(const property of includeProperties){
      if(target[property]){
        mergeObject(target[property],source[property]);
      }else{
        target[property] =source[property];
      }
    }
  }else{
    mergeObject(target,source);
  }
  fs.writeFileSync(targetPath, JSON.stringify(target, null, '  '));
}

module.exports = {
  mkdir,
  rm,
  cp,
  parseJson,
  replaceAll,
  mergeObject,
  mergeJsonFile,
};