const Base = require('./base.js')
const util = require('util')

class TypeNumber extends Base {
  constructor () {
    super()
    this._type = 'number'
    this._min = null
    this._max = null
  }

  /**
   * set min value
   * @param {number} num
   */
  min (num) {
    if (!isFinite(num) || num === true || num === false) throw new Error('input wrong')
    if (this._max !== null && this._max <= num) throw new Error(`num >= ${this._max}`)
    this._min = parseFloat(num)
    return this
  }

  /**
   * set max value
   * @param {number} num
   */
  max (num) {
    if (!isFinite(num) || num === true || num === false) throw new Error('input wrong')
    if (this._min !== null && this._min >= num) throw new Error(`num <= ${this._min}`)
    this._max = parseFloat(num)
    return this
  }

  validate (value) {
    if (value === undefined && this._required) return `required`
    if (value === undefined) return null
    /* eslint-disable-next-line */
    if (typeof value !== this._type) return `${util.inspect(value, false, null)} type not ${this._type}`
    const v = parseFloat(value)
    if (this._min !== null && v < this._min) return `value < ${this._min}`
    if (this._max !== null && v > this._max) return `value > ${this._max}`
    return null
  }
}

module.exports = TypeNumber