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/*
 * Copyright (C) 2015 Stefan Niederhauser ([email protected])
 *
 * 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.
 */
package guru.nidi.graphviz.model;

import guru.nidi.graphviz.attribute.Attributed;

import java.util.*;

/**
 *
 */
public class Graph implements Linkable, LinkTarget {
    final boolean strict;
    final boolean directed;
    final boolean cluster;
    final Label label;
    final Set nodes = new LinkedHashSet<>();
    final Set subgraphs = new LinkedHashSet<>();
    final List links = new ArrayList<>();
    final SimpleAttributed attributes = new SimpleAttributed<>(this);
    final SimpleAttributed nodeAttributes = new SimpleAttributed<>(this);
    final SimpleAttributed linkAttributes = new SimpleAttributed<>(this);
    final SimpleAttributed graphAttributes = new SimpleAttributed<>(this);

    private Graph(boolean strict, boolean directed, boolean cluster, Label label) {
        this.strict = strict;
        this.directed = directed;
        this.cluster = cluster;
        this.label = label;
        final CreationContext ctx = CreationContext.current();
        if (ctx != null) {
            general().attr(ctx.graphs());
        }
    }

    public static Graph named(Label label) {
        return new Graph(false, false, false, label);
    }

    public static Graph named(String name) {
        return named(Label.of(name));
    }

    public static Graph nameless() {
        return named("");
    }

    public Graph strict() {
        return new Graph(true, directed, false, label);
    }

    public Graph directed() {
        return new Graph(strict, true, false, label);
    }

    public Graph cluster() {
        return new Graph(strict, directed, true, label);
    }

    public Graph node(Node... nodes) {
        for (final Node node : nodes) {
            node(node);
        }
        return this;
    }

    public Graph node(Node node) {
        nodes.add(node);
        return this;
    }

    public Graph node(String... nodes) {
        for (final String node : nodes) {
            node(node);
        }
        return this;
    }

    public Graph node(String node) {
        return node(Node.named(node));
    }

    public Graph graph(Graph... subgraphs) {
        for (final Graph subgraph : subgraphs) {
            graph(subgraph);
        }
        return this;
    }

    public Graph graph(Graph subgraph) {
        subgraphs.add(subgraph);
        return this;
    }

    public Graph link(LinkSource... sources) {
        for (final LinkSource source : sources) {
            link(source.linkFrom());
        }
        return this;
    }

    public Graph link(LinkSource source) {
        final Link link = source.linkFrom();
        links.add(Link.between(this, link.to).attr(link.attributes));
        return this;
    }

    public Attributed node() {
        return nodeAttributes;
    }

    public Attributed link() {
        return linkAttributes;
    }

    public Attributed graph() {
        return graphAttributes;
    }

    public Attributed general() {
        return attributes;
    }

    @Override
    public Label getName() {
        return label;
    }

    @Override
    public Collection getLinks() {
        return links;
    }

    @Override
    public Link linkFrom() {
        return Link.to(this);
    }
}