src/app/store/statements/reducers/entities.reducer.ts

/********************************************************************************
 * Copyright (c) 2020 Contributors to the Eclipse Foundation
 *
 * See the NOTICE file(s) distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0
 *
 * SPDX-License-Identifier: EPL-2.0
 ********************************************************************************/

import {Action, createReducer, on} from "@ngrx/store";
import {arrayJoin, filterDistinctValues, TStoreEntities} from "../../../util";
import {addAttachmentsAction, addStatementsAction} from "../actions";
import {IStatementEntity} from "../model";

export const statementsEntitiesReducer = createReducer<TStoreEntities<IStatementEntity>, Action>(
    {},
    on(addStatementsAction, (state, payload) => {
        const statements = (Array.isArray(payload?.statements) ? payload.statements : [])
            .filter((statement) => typeof statement?.id === "number");

        if (statements.length === 0) {
            return state;
        }

        state = state == null ? {} : {...state};

        statements.forEach((statement) => {
            const attachments = filterDistinctValues(arrayJoin(state[statement.id]?.attachments, statement?.attachments));
            state[statement.id] = {
                ...state[statement.id],
                ...statement,
                attachments: attachments.length > 0 ? attachments : undefined
            };
        });

        return state;
    }),
    on(addAttachmentsAction, (state, payload) => {
        const id = payload?.statementId;
        const statement = id == null || state == null ? undefined : state[id];

        const attachments = (Array.isArray(payload?.attachments) ? payload.attachments : [])
            .map((attachment) => attachment.id);

        return statement == null || attachments.length === 0 ? state : {
            ...state,
            [id]: {
                ...statement,
                attachments: filterDistinctValues(arrayJoin(statement?.attachments, attachments))
            }
        };
    })
);