import DS from 'ember-data';

import Ember from 'ember';

import _ from 'lodash/lodash';

export default DS.Model.extend({

  //id: attr('string'),

  uri: DS.attr('string'),

  title: DS.attr('string'),

  language: DS.attr('string'),

  publishers: DS.attr({defaultValue: function() { return []; }}),

  contributors: DS.attr({defaultValue: function() { return []; }}),

  subjects: DS.attr({defaultValue: function() { return []; }}),

  mediaArray: DS.attr({defaultValue: function() { return []; }}),

  mediaList: Ember.computed('mediaArray', function() {

    var res = [];

    var mp3 = null;

    _.forEach(this.get('mediaArray'), function(m) {

      if(m.format === 'audio/mpeg') {

        mp3 = m;

      } else if (m.format.startsWith('audio/')) {

        res.push(m);

      }

    });

    if(mp3) {

      res.unshift(mp3);

    }

    return res;

  }),

  addContributor: function(contrib_def) {

    var contributors = this.get('contributors');

    if(_.findIndex(contributors, function(c) { return _.isEqual(c, contrib_def);}) < 0) {

      contributors.pushObject(contrib_def);

    }

    // must set dirty

    this.set('contributors', _.clone(this.get('contributors')));

  },

  removeContributor: function(contrib_def) {

    var contributors = this.get('contributors');

    var index = _.findIndex(contributors, function(c) { return _.isEqual(c, contrib_def);});

    if(index >= 0) {

      contributors.removeAt(index);

    }

    //must set dirty

    this.set('contributors', _.clone(this.get('contributors')));

  },

  saveContributor: function(contrib_def, index) {

    var contributors = this.get('contributors');

    if(index < 0 || index >= contributors.length) {

      return;

    }

    var contrib_def_map = {name: contrib_def.name||"", url: contrib_def.url||"", role: contrib_def.role||""};

    var existingContribs = _.filter(contributors, function(c, i) {

      return (i!==index && _.isEqual({name: c.name||"", url: c.url||"", role: c.role||""}, contrib_def_map));

    });

    if(existingContribs.length > 0) {

      // contributor exists, remove contributor @ index

      contributors.removeAt(index);

    }

    else {

      contributors[index] = contrib_def;

    }

    //must set dirty only if needed

    this.set('contributors', _.clone(this.get('contributors')));

  }

});