import low from 'lowdb'
import LocalStorage from 'lowdb/adapters/LocalStorage'
import { getUuid } from '@/utils/auth'
import { cloneDeep } from 'lodash'
import setting from '@/setting.js'

const adapter = new LocalStorage(setting.globalKey)
const db = low(adapter)

db.defaults({
  sys: {
    public: {},
    user: {
      'ghost-uuid': {}
    }
  },
  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 = ''
}) {
  let uuid = getUuid()
  uuid =
    uuid === undefined || uuid === null || uuid === ''
      ? 'ghost-uuid'
      : 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
    })
  )
}