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

/**
 * @typedef {import('../type.js').Schema} Schema
 */

class TypeObject extends Base {
  /**
   * @param {Object<string, Schema>} child
   */
  constructor (child) {
    super()
    if (child && typeof child !== 'object') throw new Error('child type wrong')
    this._type = 'object'
    this._child = child && Object.keys(child).length > 0 ? child : null
  }

  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}`
    if (this._child !== null) {
      try {
        validate(value, this._child)
      } catch (err) {
        return err.message
      }
    }
    return null
  }
}
module.exports = TypeObject