/*
 * Copyright (c) 2021 PANTHEON.tech, s.r.o. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */
package org.opendaylight.yangtools.yang.stmt;

import static org.hamcrest.CoreMatchers.instanceOf;
import static org.hamcrest.CoreMatchers.startsWith;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.junit.Assert.assertThrows;

import org.junit.Test;
import org.opendaylight.yangtools.yang.common.YangVersion;
import org.opendaylight.yangtools.yang.parser.spi.meta.ReactorException;
import org.opendaylight.yangtools.yang.parser.spi.source.YangVersionLinkageException;

/**
 * Tests for {@code MUST NOT} statements around include/import interop of RFC6020 and RFC7950, as per
 * <a href="https://datatracker.ietf.org/doc/html/rfc7950#section-12">RFC7950 section 12</a>.
 */
public class YT1339Test {
    @Test
    public void testInclude() {
        // A YANG version 1.1 module MUST NOT include a YANG version 1 submodule,
        assertFailedInclude("old-sub", YangVersion.VERSION_1, YangVersion.VERSION_1_1);
        // ... and a YANG version 1 module MUST NOT include a YANG version 1.1 submodule
        assertFailedInclude("new-sub", YangVersion.VERSION_1_1, YangVersion.VERSION_1);
    }

    @Test
    public void testImportNewByRev() throws Exception {
        // A YANG version 1 module or submodule MUST NOT import a YANG version 1.1 module by revision.
        assertFailedImport("import-rev");
        assertFailedImport("import-rev-sub");
    }

    @Test
    public void testImportOldByRev() throws Exception {
        // A YANG version 1.1 module or submodule MAY import a YANG version 1 module by revision.
        compile("import");
    }

    @Test
    public void testImportNoRev() throws Exception {
        // no language forbidding imports without revision
        compile("import-norev");
    }

    private static void assertFailedImport(final String subdir) {
        assertThat(assertYangVersionLinkageException(subdir),
            startsWith("Cannot import by revision version 1.1 module new [at "));
    }

    private static void assertFailedInclude(final String subdir, final YangVersion subVer, final YangVersion modVer) {
        assertThat(assertYangVersionLinkageException(subdir),
            startsWith("Cannot include a version " + subVer + " submodule in a version " + modVer + " module [at "));
    }

    private static String assertYangVersionLinkageException(final String subdir) {
        final var cause = assertThrows(ReactorException.class, () -> compile(subdir)).getCause();
        assertThat(cause, instanceOf(YangVersionLinkageException.class));
        return cause.getMessage();
    }

    private static void compile(final String subdir) throws Exception {
        StmtTestUtils.parseYangSources("/bugs/YT1339/" + subdir);
    }
}