import Backbone from 'backbone';
import { EntryModel } from 'models/entry-model';
import { Comparators } from 'util/data/comparators';

const EntryCollection = Backbone.Collection.extend({
    model: EntryModel,

    comparator: null,

    comparators: {
        'none': null,
        'title': Comparators.stringComparator('title', true),
        '-title': Comparators.stringComparator('title', false),
        'website': Comparators.stringComparator('url', true),
        '-website': Comparators.stringComparator('url', false),
        'user': Comparators.stringComparator('user', true),
        '-user': Comparators.stringComparator('user', false),
        'created': Comparators.dateComparator('created', true),
        '-created': Comparators.dateComparator('created', false),
        'updated': Comparators.dateComparator('updated', true),
        '-updated': Comparators.dateComparator('updated', false),
        '-attachments'(x, y) {
            return this.attachmentSortVal(x).localeCompare(this.attachmentSortVal(y));
        },
        '-rank': Comparators.rankComparator()
    },

    defaultComparator: 'title',

    filter: null,

    initialize(models, options) {
        const comparatorName = (options && options.comparator) || this.defaultComparator;
        this.comparator = this.comparators[comparatorName];
    },

    sortEntries(comparator, filter) {
        this.filter = filter;
        this.comparator = this.comparators[comparator] || this.comparators[this.defaultComparator];
        this.sort();
    },

    attachmentSortVal(entry) {
        const att = entry.attachments;
        let str = att.length ? String.fromCharCode(64 + att.length) : 'Z';
        if (att[0]) {
            str += att[0].title;
        }
        return str;
    }
});

export { EntryCollection };