import request from '@/utils/request'

class Errors {
  constructor() {
    this.errors = {}
  }
  has(field) {
    return this.errors.hasOwnProperty(field)
  }
  any() {
    return Object.keys(this.errors).length > 0
  }
  get(field) {
    if (this.errors[field]) {
      return this.errors[field][0]
    }
  }
  record(errors) {
    this.errors = errors
  }
  clear(field) {
    if (field) {
      delete this.errors[field]
      return
    }
    this.errors = {}
  }
}

export default class Form {
  constructor(data) {
    this.originalData = data
    for (const field in data) {
      this[field] = data[field]
    }
    this.errors = new Errors()
    this.submiting = false
  }
  data() {
    const data = {}
    for (const property in this.originalData) {
      if (this[property] !== null) {
        data[property] = this[property]
      }
    }
    return data
  }
  reset() {
    for (const field in this.originalData) {
      this[field] = this.originalData[field]
    }
    this.errors.clear()
  }
  post(url) {
    return this.submit('post', url)
  }
  submit(requestType, url) {
    this.submiting = true
    return new Promise((resolve, reject) => {
      request({
        url: url,
        method: requestType,
        data: this.data()
      })
        .then(response => {
          this.submiting = false
          this.onSuccess()
          resolve(response.data)
        })
        .catch(error => {
          this.submiting = false
          this.onFail(error.response.data.error)
          reject(error.response.data.error)
        })
    })
  }
  onSuccess() {
    this.reset()
  }
  onFail(errors) {
    this.errors.record(errors)
  }
}