const _ = require('lodash')
const resMessage = require('./res-message')
/**
 * check Object
 * @param {string} key key name
 * @param {string} type type name
 * @param {boolean} empty can empty
 */
const chkObject = function (key = '', type = '', empty = false) {
  const uuidChk = /^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i
  if (!(key in this.body)) return false

  switch (type) {
    case 'string':
      if (typeof this.body[key] !== 'string' || (!empty && !this.body[key])) return false
      break
    case 'number':
      if (!isFinite(this.body[key])) return false
      break
    case 'boolean':
      if (typeof this.body[key] !== 'boolean') return false
      break
    case 'array':
      if (!Array.isArray(this.body[key]) || (!empty && this.body[key].length === 0)) return false
      break
    case 'uuid':
      if (typeof this.body[key] !== 'string') return false
      if (!empty && this.body[key] === '') return false
      if (!empty && !uuidChk.test(this.body[key])) return false
      break
    case 'object':
      if (typeof this.body[key] !== 'object') return false
      try {
        let str = JSON.stringify(this.body[key])
        JSON.parse(str)
      } catch (err) {
        return false
      }
      break
    default:
      return false
  }

  return true
}

/**
 * parse number
 * @param {any} v input number
 * @param {number} def default number
 * @param {number} min min number
 * @param {number} max max number
 * @return {number}
 */
const toInt = (v, def = 0, min = null, max = null) => {
  if (!isFinite(def)) def = 0
  if (typeof def === 'string') def = parseInt(def)
  min = isFinite(min) ? (typeof min === 'string' ? parseInt(min) : min) : null
  max = isFinite(max) ? (typeof max === 'string' ? parseInt(max) : max) : null
  if (!isFinite(v)) return def
  v = parseInt(v)
  if (min !== null && v < min) v = min
  if (max !== null && v > max) v = max
  return v
}

/**
 * response object
 * @param {string} key response key
 * @param {string|object} message response object or message
 * @param {number} msgCode message code
 */
const resObject = (key = null, message = null, msgCode = null) => {
  if (key === null || typeof key !== 'string' || key.trim().length === 0) key = 'InternalError'
  key = key.trim()
  let resObj = _.cloneDeep(resMessage[key] || {})

  if (msgCode !== null && isFinite(msgCode)) {
    resObj.obj.msgCode = toInt(msgCode)
  }

  if (typeof message === 'string' && message.trim().length > 0) {
    resObj.obj.message = message.trim()
  } else if (typeof message === 'object') {
    resObj.obj = message
  }
  return resObj
}

/**
 * API Error cls
 */
class APIError extends Error {
  set apiMsg (txt = '') {
    if (typeof txt !== 'string') txt = null
    this._apiMsg = txt
  }
  get apiMsg () {
    return this._apiMsg
  }

  set msgCode (code = 0) {
    this._code = toInt(code, 0)
  }
  get msgCode () {
    return this._code
  }

  set resKey (txt = '') {
    if (typeof txt !== 'string' || txt.trim().length === 0) txt = 'InternalError'
    this._resKey = txt
  }
  get resKey () {
    return this._resKey
  }
}

const genError = (key = null, message = null, msgCode = null) => {
  let cls = new APIError()
  cls.apiMsg = message
  cls.msgCode = msgCode
  cls.resKey = key
  return cls
}

const checkSession = async (c, n) => {
  if (!('session' in c) || !('user' in c.session) || !('loginType' in c.session)) throw genError('NotLogin')

  return n()
}

module.exports = {
  chkObject,
  resObject,
  toInt,
  APIError,
  genError,
  checkSession
}