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) {
  if (isFileExisted(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 sortObject(target);
}

/**
 * 排序对象的属性
 * @param {*} obj 对象
 * @returns 排序后的对象
 */
function sortObject(obj) {
  if (!obj) {
    return null;
  }
  const propertyNames = [];
  for (const property in obj) {
    propertyNames.push(property);
  }
  propertyNames.sort();
  const result = {};
  for (const propertyName of propertyNames) {
    const value = obj[propertyName];
    if (typeof value === 'object' && !Array.isArray(value)) {
      result[propertyName] = sortObject(obj[propertyName]);
    } else {
      result[propertyName] = obj[propertyName];
    }
  }
  return result;
}

/**
 * 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);
  }
  if (target['devDependencies']) {
    target['devDependencies'] = sortObjectProperties(target['devDependencies']);
  }
  if (target['dependencies']) {
    target['dependencies'] = sortObjectProperties(target['dependencies']);
  }
  if (target['peer-dependencies']) {
    target['peer-dependencies'] = sortObjectProperties(target['peer-dependencies']);
  }
  fs.writeFileSync(targetPath, JSON.stringify(target, null, '  '));
}

/**
 * 判断一个文件是否存在
 * @param {*} file 文件路径
 * @returns 文件是否存在
 */
function isFileExisted(file) {
  return fs.existsSync(file);
}

function sortObjectProperties(map) {
  const names = [];
  for (const item in map) {
    names.push(item);
  }
  names.sort();
  const result = {};
  for (const name of names) {
    result[name] = map[name];
  }
  return result;
}

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