import { isObject } from './isObject';

interface Rename {
  [propName: string]: string;
}

interface Config {
  lowerFirst?: boolean;
  rename?: Rename;
  remove?: string[];
  camel?: string[];
  bool?: string[];
}

const TRUE = ['true', 'TRUE', '1', 1];
const FALSE = ['false', 'FALSE', '0', 0];

export function dataFix(o: object, conf: Config, finalKill?: Function) {
  if (!isObject(o)) return;

  const { remove = [], rename = {}, camel = [], bool = [], lowerFirst = false } = conf;

  // 删除不需要的数据
  remove.forEach(v => delete o[v]);

  // 重命名
  Object.entries(rename).forEach(v => {
    if (!o[v[0]]) return;
    if (o[v[1]]) return;
    o[v[1]] = o[v[0]];
    delete o[v[0]];
  });

  // 驼峰化
  camel.forEach(v => {
    if (!o[v]) return;
    const afterKey = v.replace(/^(.)/, $0 => $0.toLowerCase()).replace(/-(\w)/g, (_, $1) => $1.toUpperCase());
    if (o[afterKey]) return;
    o[afterKey] = o[v];
    // todo 暂时兼容以前数据，不做删除
    // delete o[v];
  });

  // 转换值为布尔值
  bool.forEach(v => {
    o[v] = fixBool(o[v]);
  });

  // finalKill
  if (typeof finalKill === 'function') {
    finalKill(o);
  }

  // 首字母转小写
  fixLowerFirst(o, lowerFirst);

  return dataFix;
}

function fixBool(value) {
  if (!value) return false;

  if (TRUE.includes(value)) return true;

  return FALSE.includes(value) ? false : value;
}

function fixLowerFirst(o, lowerFirst) {
  if (lowerFirst) {
    Object.keys(o).forEach(key => {
      const lowerK = key.replace(/^\w/, match => match.toLowerCase());
      if (typeof o[lowerK] === 'undefined') {
        o[lowerK] = o[key];
        delete o[key];
      }
    });
  }
}
