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/*
 * Copyright 2021 Red Hat, Inc. and/or its affiliates.
 *
 * 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 org.drools.impact.analysis.graph;

import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

import org.drools.impact.analysis.graph.Node.Status;

public class TextReporter {

    public static String INDENT = "  ";

    private TextReporter() {}

    public static String toFlatText(Graph g) {
        StringBuilder sb = new StringBuilder();
        List keyList = g.getNodeMap().keySet().stream().sorted().collect(Collectors.toList());
        for (String key : keyList) {
            Node node = g.getNodeMap().get(key);
            appendNodeText(sb, node);
        }
        return sb.toString();
    }

    private static void appendNodeText(StringBuilder sb, Node node) {
        String ruleName = node.getRuleName();
        sb.append(ruleName);
        sb.append(statusToMark(node.getStatus()));
        sb.append(System.lineSeparator());
    }

    private static String statusToMark(Status status) {
        switch (status) {
            case CHANGED:
                return "[*]";
            case IMPACTED:
                return "[+]";
            case TARGET:
                return "[@]";
            case IMPACTING:
                return "[!]";
            case NONE:
            default:
                return "";
        }
    }

    /**
     * Render forward graph of impact analysis with hierarchy text
     * @param g
     * @return text
     */
    public static String toHierarchyText(Graph g) {
        StringBuilder sb = new StringBuilder();
        List keyList = g.getNodeMap().keySet().stream().sorted().collect(Collectors.toList());
        Set pickedNodeSet = new HashSet<>();
        for (String key : keyList) {
            Node node = g.getNodeMap().get(key);
            if (pickedNodeSet.contains(node)) {
                continue;
            }
            addNode(g, node, "", pickedNodeSet, sb);
        }
        return sb.toString();
    }

    private static void addNode(Graph g, Node node, String indent, Set pickedNodeSet, StringBuilder sb) {
        sb.append(indent);
        appendNodeText(sb, node);

        pickedNodeSet.add(node);

        for (Link link : node.getOutgoingLinks()) {
            Node target = link.getTarget();
            if (!g.getNodeMap().containsValue(target)) {
                continue;
            }
            if (pickedNodeSet.contains(target)) {
                addNodeWithoutCircular(target, indent + INDENT, sb);
            } else {
                addNode(g, target, indent + INDENT, pickedNodeSet, sb);
            }
        }
    }

    private static void addNodeWithoutCircular(Node node, String indent, StringBuilder sb) {
        sb.append(indent);
        sb.append("(" + node.getRuleName() + ")" + System.lineSeparator());
    }
}