/*!
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */

export default class Graph {
    constructor() {
        this.nodes = {};
    }

    addNode(node) {
        this.nodes[node] = [];
    }

    hasNode(node) {
        return this.nodes.hasOwnProperty(node);
    }

    addEdge(firstNode, secondNode, payload) {
        if (!this.hasNode(firstNode)) {
            this.addNode(firstNode);
        }

        if (!this.hasNode(secondNode)) {
            this.addNode(secondNode);
        }

        this.nodes[firstNode].push({ ...payload, target: secondNode });
    }

    getEdges(node) {
        return this.nodes[node];
    }
}