import FormMixin from '../../mixins/form'
import textinput from '../text_input'

const createEnvironment = name => ({ name })

export default {
  name: 'new-application',

  mixins: [FormMixin],

  components: {
    textinput,
  },

  props: {
    initialData: {
      type: Object,
      default: () => ({}),
    },
    modalName: String,
  },

  data: function() {
    const { environment_names, name } = this.initialData

    const environments = (environment_names.length > 0
      ? environment_names
      : ['Development', 'Testing', 'Staging', 'Production']
    ).map(createEnvironment)

    return {
      validations: [
        {
          func: this.hasEnvironments,
          message: 'Provide at least one environment name.',
        },
        {
          func: this.envNamesAreUnique,
          message: 'Environment names must be unique.',
        },
        {
          func: this.environmentsHaveNames,
          message: 'Environment names cannot be empty.',
        },
      ],
      errors: [],
      environments,
      name,
      readyToSubmit: false,
    }
  },

  mounted: function() {
    this.$root.$on('onEnvironmentAdded', this.addEnvironment)
  },

  methods: {
    addEnvironment: function(event) {
      this.environments.push(createEnvironment(''))
    },

    removeEnvironment: function(index) {
      if (this.environments.length > 1) {
        this.environments.splice(index, 1)
      }
    },

    validate: function() {
      this.errors = this.validations
        .map(validation => {
          if (!validation.func()) {
            return validation.message
          }
        })
        .filter(Boolean)
    },

    hasEnvironments: function() {
      return (
        this.environments.length > 0 &&
        this.environments.some(e => e.name !== '')
      )
    },

    environmentsHaveNames: function() {
      if (this.environments.length > 1) {
        // only want to display this error if we have multiple envs and one or
        // more do not have names
        return this.environments.every(e => e.name !== '')
      } else {
        return true
      }
    },

    envNamesAreUnique: function() {
      const names = this.environments.map(e => e.name)
      return names.every((n, index) => names.indexOf(n) === index)
    },

    handleSubmit: function(event) {
      if (!this.readyToSubmit) {
        event.preventDefault()
        this.validateAndOpenModal()
      }
    },

    handleCancelSubmit: function() {
      this.readyToSubmit = false
      this.closeModal(this.modalName)
    },

    validateAndOpenModal: function() {
      let isValid = this.$children.reduce((previous, newVal) => {
        // display textInput error if it is not valid
        if (!newVal.showValid) {
          newVal.showError = true
        }

        return newVal.showValid && previous
      }, true)

      this.validate()
      isValid = this.errors.length == 0 && isValid

      if (isValid) {
        this.readyToSubmit = true
        this.openModal(this.modalName)
      }
    },
  },
}