BookBrainz/bookbrainz-site

/*
 * Copyright (C) 2018  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 Immutable from 'immutable';

import {
    ADD_RELATIONSHIP,
    EDIT_RELATIONSHIP,
    HIDE_RELATIONSHIP_EDITOR,
    REMOVE_RELATIONSHIP,
    SHOW_RELATIONSHIP_EDITOR,
    UNDO_LAST_SAVE
} from './actions';


function reducer(
    state = Immutable.Map({
        canEdit: true,
        lastRelationships: null,
        relationshipEditorProps: null,
        relationshipEditorVisible: false,
        relationships: Immutable.OrderedMap()
    }),
    action
) {
    switch (action.type) {
        case SHOW_RELATIONSHIP_EDITOR:
            return state.set('relationshipEditorVisible', true)
                .set('relationshipEditorProps', null);
        case HIDE_RELATIONSHIP_EDITOR:
            return state.set('relationshipEditorVisible', false);
        case ADD_RELATIONSHIP: {
            const editRowID = state.getIn(
                ['relationshipEditorProps', 'rowID'],
                null
            );
            let mstate = state;
            if (editRowID) {
                if (!mstate.getIn(['relationships', editRowID, 'isAdded'])) {
                    mstate = state.setIn(['relationships', editRowID, 'isRemoved'], true);
                }
                else { mstate = state.deleteIn(['relationships', editRowID]); }
            }
            const {rowID} = action.payload;
            return mstate.setIn(
                ['relationships', rowID],
                Immutable.fromJS({isAdded: true, rowID, ...action.payload.data})
            )
                .set('relationshipEditorProps', null)
                .set('relationshipEditorVisible', false)
                .set('lastRelationships', state.get('relationships'));
        }
        case EDIT_RELATIONSHIP:
            return state.set(
                'relationshipEditorProps',
                state.getIn(['relationships', action.payload])
            ).set('relationshipEditorVisible', true);
        case REMOVE_RELATIONSHIP:
        // if it is the original relationship
            if (!state.getIn(['relationships', action.payload, 'isAdded'])) {
                return state.setIn(['relationships', action.payload, 'isRemoved'], true);
            }
            return state.deleteIn(['relationships', action.payload])
                .set('lastRelationships', state.get('relationships'));
        case UNDO_LAST_SAVE:
            return state.set('relationships', state.get('lastRelationships'))
                .set('lastRelationships', null);
        // no default
    }
    return state;
}

export default reducer;