bookbrainz/bookbrainz-site

/*
 * Copyright (C) 2015-2016  Ben Ockmore
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.    See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

import * as base from './base';
import _ from 'lodash';


export function formatNewSet(change, label, itemProp, transformerFunc) {
    const {rhs} = change;
    if (rhs[itemProp] && rhs[itemProp].length > 0) {
        return [base.formatRow('N', label, null, transformerFunc(rhs))];
    }

    return [];
}

export function formatItemAddOrDelete(change, label, transformerFunc) {
    return [
        base.formatChange(change, label, transformerFunc)
    ];
}

export function formatItemModified(change, label, formattedProps) {
    if (change.path.length > 3 && _.includes(formattedProps, change.path[3])) {
        return [
            base.formatChange(change, label, (side) => side && [side])
        ];
    }

    return [];
}

export function format(
    change, setProp, itemProp, newSetFormatter, addDeleteFormatter,
    modifyFormatter
) {
    const setAdded =
        change.kind === 'N' && _.isEqual(change.path, [setProp]);
    if (setAdded) {
        return newSetFormatter(change);
    }

    const itemAddDeleteModify = (change.kind === 'D' && change.path[0] === setProp) ||
        (change.path.length > 1 && change.path[0] === setProp &&
            change.path[1] === itemProp);
    if (itemAddDeleteModify) {
        if (change.kind === 'A' || change.kind === 'D') {
            // Item added to or deleted from set
            return addDeleteFormatter(change);
        }

        if (change.kind === 'E') {
            // Item in set changed
            return modifyFormatter(change);
        }
    }

    return null;
}

export function changed(change, setProp, itemProp) {
    return _.isEqual(change.path, [setProp]) ||
        _.isEqual(change.path.slice(0, 2), [setProp, itemProp]);
}