import RestModel from 'discourse/models/rest';
import { default as computed } from 'ember-addons/ember-computed-decorators';

const THEME_UPLOAD_VAR = 2;

const Theme = RestModel.extend({

  @computed('theme_fields')
  themeFields(fields) {

    if (!fields) {
      this.set('theme_fields', []);
      return {};
    }

    let hash = {};
    if (fields) {
      fields.forEach(field=>{
        if (!field.type_id || field.type_id < THEME_UPLOAD_VAR) {
          hash[this.getKey(field)] = field;
        }
      });
    }
    return hash;
  },

  @computed('theme_fields', 'theme_fields.@each')
  uploads(fields) {
    if (!fields) {
      return [];
    }
    return fields.filter((f)=> f.target === 'common' && f.type_id === THEME_UPLOAD_VAR);
  },

  getKey(field){
    return field.target + " " + field.name;
  },

  hasEdited(target, name){
    if (name) {
      return !Em.isEmpty(this.getField(target, name));
    } else {
      let fields = this.get("theme_fields") || [];
      return fields.any(field => (field.target === target && !Em.isEmpty(field.value)));
    }
  },

  getError(target, name) {
    let themeFields = this.get("themeFields");
    let key = this.getKey({target,name});
    let field = themeFields[key];
    return field ? field.error : "";
  },

  getField(target, name) {
    let themeFields = this.get("themeFields");
    let key = this.getKey({target, name});
    let field = themeFields[key];
    return field ? field.value : "";
  },

  removeField(field) {
    this.set("changed", true);

    field.upload_id = null;
    field.value = null;

    return this.saveChanges("theme_fields");
  },

  setField(target, name, value, upload_id, type_id) {
    this.set("changed", true);
    let themeFields = this.get("themeFields");
    let field = {name, target, value, upload_id, type_id};

    // slow path for uploads and so on
    if (type_id && type_id > 1) {
      let fields = this.get("theme_fields");
      let existing = fields.find((f) =>
          f.target === target &&
          f.name === name &&
          f.type_id === type_id);
      if (existing) {
        existing.value = value;
        existing.upload_id = upload_id;
      } else {
        fields.push(field);
      }
      return;
    }

    // fast path
    let key = this.getKey({target,name});
    let existingField = themeFields[key];
    if (!existingField) {
      this.theme_fields.push(field);
      themeFields[key] = field;
    } else {
      existingField.value = value;
    }
  },

  @computed("childThemes.@each")
  child_theme_ids(childThemes) {
    if (childThemes) {
      return childThemes.map(theme => Ember.get(theme, "id"));
    }
  },

  removeChildTheme(theme) {
    const childThemes = this.get("childThemes");
    childThemes.removeObject(theme);
    return this.saveChanges("child_theme_ids");
  },

  addChildTheme(theme){
    let childThemes = this.get("childThemes");
    if (!childThemes) {
      childThemes = [];
      this.set('childThemes', childThemes);
    }
    childThemes.removeObject(theme);
    childThemes.pushObject(theme);
    return this.saveChanges("child_theme_ids");
  },

  @computed('name', 'default')
  description: function(name, isDefault) {
    if (isDefault) {
      return I18n.t('admin.customize.theme.default_name', {name: name});
    } else {
      return name;
    }
  },

  checkForUpdates() {
    return this.save({remote_check: true})
      .then(() => this.set("changed", false));
  },

  updateToLatest() {
    return this.save({remote_update: true})
      .then(() => this.set("changed", false));
  },

  changed: false,

  saveChanges() {
    const hash = this.getProperties.apply(this, arguments);
    return this.save(hash)
      .then(() => this.set("changed", false));
  },

});

export default Theme;