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/*
 * Copyright (c) 2020 Richard Hauswald - https://quantummaid.de/.
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 de.quantummaid.httpmaid.chains;

import de.quantummaid.httpmaid.chains.graph.*;
import de.quantummaid.httpmaid.chains.rules.*;

import java.util.*;

import static de.quantummaid.httpmaid.util.Validators.validateNotNull;
import static java.util.Optional.empty;
import static java.util.Optional.of;

final class GraphCreator {
    private static final Node CONSUME_NODE = Node.node("CONSUME", Color.GREEN);

    private GraphCreator() {
    }

    static Graph createGraph(final Map chains) {
        validateNotNull(chains, "chains");
        final ColorPool colorPool = ColorPool.colorPool();

        final Map nodes = new HashMap<>();
        chains.forEach((name, chain) -> nodes.put(name, createNode(chain, colorPool)));

        final List edges = new LinkedList<>();
        chains.forEach((name, chain) -> {
            final Action defaultAction = chain.defaultAction();
            final Color color = colorPool.assign(chain.getModuleIdentifier());
            createEdge(name, defaultAction, color, Label.emptyLabel(), nodes).ifPresent(edges::add);

            chain.rules().stream()
                    .map(rule -> createRuleEdge(name, rule, colorPool, nodes))
                    .flatMap(Optional::stream)
                    .forEach(edges::add);
        });
        return Graph.graph(nodes.values(), edges);
    }

    private static Node createNode(final Chain chain,
                                   final ColorPool colorPool) {
        final ModuleIdentifier moduleIdentifier = chain.getModuleIdentifier();
        final Color color = colorPool.assign(moduleIdentifier);
        final String name = chain.getName().name();
        final Label label = createLabel(chain, colorPool);
        return Node.node(name, label, color);
    }

    private static Label createLabel(final Chain chain,
                                     final ColorPool colorPool) {
        final StringBuilder labelBuilder = new StringBuilder();
        final Color color = colorPool.assign(chain.getModuleIdentifier());
        labelBuilder.append(color.colorized(chain.getName().name()));
        chain.processors().forEach(processor -> {
            final Color processorColor = colorPool.assign(processor.identifier());
            labelBuilder.append("
");
            labelBuilder.append(processorColor.colorized(processor.processor().identifier()));
        });
        return Label.htmlLabel(labelBuilder.toString());
    }

    private static Optional createRuleEdge(final ChainName from,
                                                 final Rule rule,
                                                 final ColorPool colorPool,
                                                 final Map nodes) {
        final Color color = colorPool.assign(rule.moduleIdentifier());
        final Action action = rule.action();
        final RuleDescription description = rule.description();

        final String label;
        if (action instanceof Jump) {
            label = color.colorized(description.value().orElse("?"));
        } else if (action instanceof Consume || action instanceof Drop) {
            label = color.colorized(description.value().orElse(""));
        } else {
            throw new UnsupportedOperationException();
        }

        return createEdge(from, action, color, Label.htmlLabel(label), nodes);
    }

    private static Optional createEdge(final ChainName from,
                                             final Action action,
                                             final Color color,
                                             final Label label,
                                             final Map nodes) {
        final Node fromNode = nodes.get(from);
        if (action instanceof Jump) {
            final Jump jump = (Jump) action;
            final ChainName to = jump.target().orElseThrow();
            return of(Edge.edge(fromNode, nodes.get(to), color, label));
        }
        if (action instanceof Consume) {
            return of(Edge.edge(fromNode, CONSUME_NODE, color, label));
        }
        if (action instanceof Drop) {
            return empty();
        }
        throw new UnsupportedOperationException();
    }
}