import low from "lowdb";
import LocalStorage from "lowdb/adapters/LocalStorage";
import util from "@/libs/util";
import { cloneDeep } from "lodash";

const adapter = new LocalStorage(`aps-${process.env.VUE_APP_VERSION}`);
const db = low(adapter);

db.defaults({
  sys: {},
  database: {},
}).write();

export default db;

/**
 * @description 检查路径是否存在 不存在的话初始化
 * @param {Object} payload dbName {String} 数据库名称
 * @param {Object} payload path {String} 路径
 * @param {Object} payload user {Boolean} 区分用户
 * @param {Object} payload validator {Function} 数据校验钩子 返回 true 表示验证通过
 * @param {Object} payload defaultValue {*} 初始化默认值
 * @returns {String} 可以直接使用的路径
 */
export function pathInit({
  dbName = "database",
  path = "",
  user = true,
  validator = () => true,
  defaultValue = "",
}) {
  const uuid = util.cookies.get("uuid") || "ghost-uuid";
  const currentPath = `${dbName}.${user ? `user.${uuid}` : "public"}${
    path ? `.${path}` : ""
  }`;
  const value = db.get(currentPath).value();
  if (!(value !== undefined && validator(value))) {
    db.set(currentPath, defaultValue).write();
  }
  return currentPath;
}

/**
 * @description 将数据存储到指定位置 | 路径不存在会自动初始化
 * @description 效果类似于取值 dbName.path = value
 * @param {Object} payload dbName {String} 数据库名称
 * @param {Object} payload path {String} 存储路径
 * @param {Object} payload value {*} 需要存储的值
 * @param {Object} payload user {Boolean} 是否区分用户
 */
export function dbSet({
  dbName = "database",
  path = "",
  value = "",
  user = false,
}) {
  db.set(
    pathInit({
      dbName,
      path,
      user,
    }),
    value
  ).write();
}

/**
 * @description 获取数据
 * @description 效果类似于取值 dbName.path || defaultValue
 * @param {Object} payload dbName {String} 数据库名称
 * @param {Object} payload path {String} 存储路径
 * @param {Object} payload defaultValue {*} 取值失败的默认值
 * @param {Object} payload user {Boolean} 是否区分用户
 */
export function dbGet({
  dbName = "database",
  path = "",
  defaultValue = "",
  user = false,
}) {
  return cloneDeep(
    db
      .get(
        pathInit({
          dbName,
          path,
          user,
          defaultValue,
        })
      )
      .value()
  );
}

/**
 * @description 获取存储数据库对象
 * @param {Object} payload user {Boolean} 是否区分用户
 */
export function database({
  dbName = "database",
  path = "",
  user = false,
  validator = () => true,
  defaultValue = "",
} = {}) {
  return db.get(
    pathInit({
      dbName,
      path,
      user,
      validator,
      defaultValue,
    })
  );
}