/*
 * Copyright (c) 2013 Cisco Systems, Inc. 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.yang2sources.plugin.it;

import static org.hamcrest.CoreMatchers.containsString;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.fail;

import com.google.common.base.Joiner;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.Arrays;
import java.util.Optional;
import java.util.Properties;
import org.apache.maven.it.VerificationException;
import org.apache.maven.it.Verifier;
import org.junit.BeforeClass;
import org.junit.Test;

public class YangToSourcesPluginTestIT {

    // TODO Test yang files in transitive dependencies

    @Test
    public void testYangRootNotExist() throws Exception {
        Verifier v = setUp("test-parent/YangRootNotExist/", false);
        v.verifyTextInLog("[WARNING] yang-to-sources: YANG source directory");
    }

    @Test
    public void testCorrect() throws Exception {
        Verifier v = setUp("test-parent/Correct/", false);
        verifyCorrectLog(v);
    }

    @Test
    public void testAdditionalConfiguration() throws Exception {
        Verifier v = setUp("test-parent/AdditionalConfig/", false);
        v.verifyTextInLog("[DEBUG] yang-to-sources: Additional configuration picked up for : org.opendaylight.yangtools.yang2sources.spi.CodeGeneratorTestImpl: {nm1=abcd=a.b.c.d, nm2=abcd2=a.b.c.d.2}");
        v.verifyTextInLog("[DEBUG] yang-to-sources: Additional configuration picked up for : org.opendaylight.yangtools.yang2sources.spi.CodeGeneratorTestImpl: {c1=config}");
        v.verifyTextInLog(File.separator
                + "files marked as resources: META-INF/yang");
        v.verifyTextInLog(
                Joiner.on(File.separator).join(
                        Arrays.asList("target", "generated-sources", "spi"))

                        + " marked as resources for generator: org.opendaylight.yangtools.yang2sources.spi.CodeGeneratorTestImpl");
    }

    @Test
    public void testMissingYangInDep() throws Exception {
        try {
            setUp("test-parent/MissingYangInDep/", false);
        } catch (VerificationException e) {
            assertVerificationException(
                    e,
                    "org.opendaylight.yangtools.yang.parser.spi.meta.InferenceException: Imported module " +
                    "[unknownDep] was not found.");
            return;
        }

        fail("Verification exception should have been thrown");
    }

    static void verifyCorrectLog(final Verifier v) throws VerificationException {
        v.verifyErrorFreeLog();
        v.verifyTextInLog("[INFO] yang-to-sources: YANG files parsed from");
        v.verifyTextInLog("[INFO] yang-to-sources: Code generator instantiated from org.opendaylight.yangtools.yang2sources.spi.CodeGeneratorTestImpl");
        v.verifyTextInLog("[INFO] yang-to-sources: Sources generated by org.opendaylight.yangtools.yang2sources.spi.CodeGeneratorTestImpl: null");
    }

    @Test
    public void testNoGenerators() throws Exception {
        Verifier v = setUp("test-parent/NoGenerators/", false);
        v.verifyErrorFreeLog();
        v.verifyTextInLog("[WARNING] yang-to-sources: No code generators provided");
    }

    @Test
    public void testInvalidVersion() throws Exception {
        Verifier v = setUp("test-parent/InvalidVersion/", false);
        v.verifyErrorFreeLog();
        v.verifyTextInLog("[WARNING] yang-to-sources: Dependency resolution conflict:");
    }

    @Test
    public void testUnknownGenerator() throws Exception {
        Verifier v = setUp("test-parent/UnknownGenerator/", true);
        v.verifyTextInLog("[ERROR] yang-to-sources: Unable to generate sources with unknown generator");
        v.verifyTextInLog("java.lang.ClassNotFoundException: unknown");
        v.verifyTextInLog("[INFO] yang-to-sources: Code generator instantiated from org.opendaylight.yangtools.yang2sources.spi.CodeGeneratorTestImpl");
        v.verifyTextInLog("[INFO] yang-to-sources: Sources generated by org.opendaylight.yangtools.yang2sources.spi.CodeGeneratorTestImpl: null");
        v.verifyTextInLog("[ERROR] yang-to-sources: One or more code generators failed, including failed list(generatorClass=exception) {unknown=java.lang.ClassNotFoundException}");
    }

    @Test
    public void testNoYangFiles() throws Exception {
        Verifier v = setUp("test-parent/NoYangFiles/", false);
        v.verifyTextInLog("[INFO] yang-to-sources: No input files found");
    }

    static void assertVerificationException(final VerificationException e,
            final String string) {
        assertThat(e.getMessage(), containsString(string));
    }

    static Verifier setUp(final String project, final boolean ignoreF)
            throws VerificationException, URISyntaxException, IOException {
        final URL path = YangToSourcesPluginTestIT.class.getResource("/"
                + project + "pom.xml");
        File parent = new File(path.toURI());
        Verifier verifier = new Verifier(parent.getParent());
        if (ignoreF) {
            verifier.addCliOption("-fn");
        }

		final Optional<String> maybeSettings = getEffectiveSettingsXML();
		if (maybeSettings.isPresent()) {
            verifier.addCliOption("-gs");
            verifier.addCliOption(maybeSettings.get());
        }
        verifier.setMavenDebug(true);
        verifier.executeGoal("generate-sources");
        return verifier;
    }

    @Test
    public void testNoOutputDir() throws Exception {
        Verifier v = YangToSourcesPluginTestIT.setUp("test-parent/NoOutputDir/", false);
        verifyCorrectLog(v);
    }

    @Test
    public void testFindResourceOnCp() throws Exception {
        Verifier v1 = setUp("test-parent/GenerateTest1/", false);
        v1.executeGoal("clean");
        v1.executeGoal("package");

        String buildDir = getMavenBuildDirectory(v1);
        v1.assertFilePresent(buildDir + "/classes/META-INF/yang/testfile1.yang");
        v1.assertFilePresent(buildDir + "/classes/META-INF/yang/testfile2.yang");
        v1.assertFilePresent(buildDir + "/classes/META-INF/yang/testfile3.yang");

        Verifier v2 = setUp("test-parent/GenerateTest2/", false);
        v2.executeGoal("clean");
        v2.executeGoal("package");

        buildDir = getMavenBuildDirectory(v2);
        v2.assertFilePresent(buildDir + "/classes/META-INF/yang/private.yang");
        v2.assertFileNotPresent(buildDir + "/classes/META-INF/yang/testfile1.yang");
        v2.assertFileNotPresent(buildDir + "/classes/META-INF/yang/testfile2.yang");
        v2.assertFileNotPresent(buildDir + "/classes/META-INF/yang/testfile3.yang");
    }

    private static String getMavenBuildDirectory(Verifier verifier) throws IOException {
        Properties sp = new Properties();
        try (InputStream is = new FileInputStream(verifier.getBasedir() + "/it-project.properties")) {
            sp.load(is);
        }
        return sp.getProperty("target.dir");
    }

    private static Optional<String> getEffectiveSettingsXML() throws URISyntaxException, VerificationException, IOException {
        final URL path = YangToSourcesPluginTestIT.class.getResource("/test-parent/pom.xml");
        File buildDir = new File(path.toURI()).getParentFile().getParentFile().getParentFile();
        File effectiveSettingsXML = new File(buildDir, "effective-settings.xml");
        if (effectiveSettingsXML.exists()) {
            return Optional.of(effectiveSettingsXML.getAbsolutePath());
        } else {
            fail(effectiveSettingsXML.getAbsolutePath());
            return Optional.empty();
        }
    }

}

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