import computed from 'ember-addons/ember-computed-decorators';
import { categoryLinkHTML } from 'discourse/helpers/category-link';

const CUSTOM_TYPES = [
  'bool',
  'enum',
  'list',
  'url_list',
  'host_list',
  'category_list',
  'value_list',
  'category'
];

export default Ember.Mixin.create({
  classNameBindings: [':row', ':setting', 'setting.overridden', 'typeClass'],
  content: Ember.computed.alias('setting'),
  validationMessage: null,

  @computed("buffered.value", "setting.value")
  dirty(bufferVal, settingVal) {
    if (bufferVal === null || bufferVal === undefined) bufferVal = '';
    if (settingVal === null || settingVal === undefined) settingVal = '';

    return bufferVal.toString() !== settingVal.toString();
  },

  @computed("setting", "buffered.value")
  preview(setting, value) {
    // A bit hacky, but allows us to use helpers
    if (setting.get('setting') === 'category_style') {
      let category = this.site.get('categories.firstObject');
      if (category) {
        return categoryLinkHTML(category, {
          categoryStyle: value
        });
      }
    }

    let preview = setting.get('preview');
    if (preview) {
      return new Handlebars.SafeString("<div class='preview'>" + preview.replace(/\{\{value\}\}/g, value) + "</div>");
    }
  },

  @computed('componentType')
  typeClass(componentType) {
    return componentType.replace(/\_/g, '-');
  },

  @computed("setting.setting")
  settingName(setting) {
    return setting.replace(/\_/g, ' ');
  },

  @computed("setting.type")
  componentType(type) {
    return CUSTOM_TYPES.indexOf(type) !== -1 ? type : 'string';
  },

  @computed("typeClass")
  componentName(typeClass) {
    return "site-settings/" + typeClass;
  },

  _watchEnterKey: function() {
    const self = this;
    this.$().on("keydown.setting-enter", ".input-setting-string", function (e) {
      if (e.keyCode === 13) { // enter key
        self._save();
      }
    });
  }.on('didInsertElement'),

  _removeBindings: function() {
    this.$().off("keydown.setting-enter");
  }.on("willDestroyElement"),

  _save() {
    Em.warn("You should define a `_save` method", { id: "admin.mixins.setting-component" });
    return Ember.RSVP.resolve();
  },

  actions: {
    save() {
      this._save().then(() => {
        this.set('validationMessage', null);
        this.commitBuffer();
      }).catch(e => {
        if (e.jqXHR.responseJSON && e.jqXHR.responseJSON.errors) {
          this.set('validationMessage', e.jqXHR.responseJSON.errors[0]);
        } else {
          this.set('validationMessage', I18n.t('generic_error'));
        }
      });
    },

    resetDefault() {
      this.set('buffered.value', this.get('setting.default'));
      this._save();
    },

    cancel() {
      this.rollbackBuffer();
    }
  }
});