/*
 * 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 org.eclipse.aether.util.graph.transformer;

import java.util.Locale;

import org.eclipse.aether.collection.DependencyGraphTransformer;
import org.eclipse.aether.graph.DependencyNode;
import org.eclipse.aether.internal.test.util.DependencyGraphParser;
import org.junit.Test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertSame;

public class JavaScopeSelectorTest extends AbstractDependencyGraphTransformerTest {

    private enum Scope {
        TEST,
        PROVIDED,
        RUNTIME,
        COMPILE;

        @Override
        public String toString() {
            return super.name().toLowerCase(Locale.ENGLISH);
        }
    }

    @Override
    protected DependencyGraphTransformer newTransformer() {
        return new ConflictResolver(
                new NearestVersionSelector(), new JavaScopeSelector(),
                new SimpleOptionalitySelector(), new JavaScopeDeriver());
    }

    @Override
    protected DependencyGraphParser newParser() {
        return new DependencyGraphParser("transformer/scope-calculator/");
    }

    private void expectScope(String expected, DependencyNode root, int... coords) {
        expectScope(null, expected, root, coords);
    }

    private void expectScope(String msg, String expected, DependencyNode root, int... coords) {
        if (msg == null) {
            msg = "";
        }
        try {
            DependencyNode node = root;
            node = path(node, coords);

            assertEquals(
                    msg + "\nculprit: " + node.toString() + "\n",
                    expected,
                    node.getDependency().getScope());
        } catch (IndexOutOfBoundsException | NullPointerException e) {
            throw new IllegalArgumentException("illegal coordinates for child", e);
        }
    }

    private DependencyNode path(DependencyNode node, int... coords) {
        for (int coord : coords) {
            node = node.getChildren().get(coord);
        }
        return node;
    }

    @Test
    public void testScopeInheritanceProvided() throws Exception {
        String resource = "inheritance.txt";

        String expected = "test";
        DependencyNode root = transform(parseResource(resource, "provided", "test"));
        expectScope(parser.dump(root), expected, root, 0, 0);
    }

    @Test
    public void testConflictWinningScopeGetsUsedForInheritance() throws Exception {
        DependencyNode root = parseResource("conflict-and-inheritance.txt");
        assertSame(root, transform(root));

        expectScope("compile", root, 0, 0);
        expectScope("compile", root, 0, 0, 0);
    }

    @Test
    public void testScopeOfDirectDependencyWinsConflictAndGetsUsedForInheritanceToChildrenEverywhereInGraph()
            throws Exception {
        DependencyNode root = parseResource("direct-with-conflict-and-inheritance.txt");
        assertSame(root, transform(root));

        expectScope("test", root, 0, 0);
    }

    @Test
    public void testCycleA() throws Exception {
        DependencyNode root = parseResource("cycle-a.txt");
        assertSame(root, transform(root));

        expectScope("compile", root, 0);
        expectScope("runtime", root, 1);
    }

    @Test
    public void testCycleB() throws Exception {
        DependencyNode root = parseResource("cycle-b.txt");
        assertSame(root, transform(root));

        expectScope("runtime", root, 0);
        expectScope("compile", root, 1);
    }

    @Test
    public void testCycleC() throws Exception {
        DependencyNode root = parseResource("cycle-c.txt");
        assertSame(root, transform(root));

        expectScope("runtime", root, 0);
        expectScope("runtime", root, 0, 0);
        expectScope("runtime", root, 1);
        expectScope("runtime", root, 1, 0);
    }

    @Test
    public void testCycleD() throws Exception {
        DependencyNode root = parseResource("cycle-d.txt");
        assertSame(root, transform(root));

        expectScope("compile", root, 0);
        expectScope("compile", root, 0, 0);
    }

    @Test
    public void testDirectNodesAlwaysWin() throws Exception {

        for (Scope directScope : Scope.values()) {
            String direct = directScope.toString();

            DependencyNode root = parseResource("direct-nodes-winning.txt", direct);

            String msg = String.format(
                    "direct node should be setting scope ('%s') for all nodes.\n" + parser.dump(root), direct);
            assertSame(root, transform(root));
            msg += "\ntransformed:\n" + parser.dump(root);

            expectScope(msg, direct, root, 0);
        }
    }

    @Test
    public void testNonDirectMultipleInheritance() throws Exception {
        for (Scope scope1 : Scope.values()) {
            for (Scope scope2 : Scope.values()) {
                DependencyNode root = parseResource("multiple-inheritance.txt", scope1.toString(), scope2.toString());

                String expected = scope1.compareTo(scope2) >= 0 ? scope1.toString() : scope2.toString();
                String msg = String.format("expected '%s' to win\n" + parser.dump(root), expected);

                assertSame(root, transform(root));
                msg += "\ntransformed:\n" + parser.dump(root);

                expectScope(msg, expected, root, 0, 0);
            }
        }
    }

    @Test
    public void testConflictScopeOrdering() throws Exception {
        for (Scope scope1 : Scope.values()) {
            for (Scope scope2 : Scope.values()) {
                DependencyNode root = parseResource("dueling-scopes.txt", scope1.toString(), scope2.toString());

                String expected = scope1.compareTo(scope2) >= 0 ? scope1.toString() : scope2.toString();
                String msg = String.format("expected '%s' to win\n" + parser.dump(root), expected);

                assertSame(root, transform(root));
                msg += "\ntransformed:\n" + parser.dump(root);

                expectScope(msg, expected, root, 0, 0);
            }
        }
    }

    /**
     * obscure case (illegal maven POM).
     */
    @Test
    public void testConflictingDirectNodes() throws Exception {
        for (Scope scope1 : Scope.values()) {
            for (Scope scope2 : Scope.values()) {
                DependencyNode root =
                        parseResource("conflicting-direct-nodes.txt", scope1.toString(), scope2.toString());

                String expected = scope1.toString();
                String msg = String.format("expected '%s' to win\n" + parser.dump(root), expected);

                assertSame(root, transform(root));
                msg += "\ntransformed:\n" + parser.dump(root);

                expectScope(msg, expected, root, 0);
            }
        }
    }
}
