/*
 * 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.apache.maven.rtinfo.internal;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.Validate;
import org.apache.maven.rtinfo.RuntimeInformation;
import org.codehaus.plexus.component.annotations.Component;
import org.codehaus.plexus.component.annotations.Requirement;
import org.codehaus.plexus.logging.Logger;
import org.eclipse.aether.util.version.GenericVersionScheme;
import org.eclipse.aether.version.InvalidVersionSpecificationException;
import org.eclipse.aether.version.Version;
import org.eclipse.aether.version.VersionConstraint;
import org.eclipse.aether.version.VersionScheme;

/**
 * Provides information about the current Maven runtime.
 */
@Component(role = RuntimeInformation.class)
public class DefaultRuntimeInformation implements RuntimeInformation {

    @Requirement
    private Logger logger;

    private String mavenVersion;

    public String getMavenVersion() {
        if (mavenVersion == null) {
            Properties props = new Properties();

            String resource = "META-INF/maven/org.apache.maven/maven-core/pom.properties";

            try (InputStream is = DefaultRuntimeInformation.class.getResourceAsStream("/" + resource)) {
                if (is != null) {
                    props.load(is);
                } else {
                    logger.warn(
                            "Could not locate " + resource + " on classpath, Maven runtime information not available");
                }
            } catch (IOException e) {
                String msg = "Could not parse " + resource + ", Maven runtime information not available";
                if (logger.isDebugEnabled()) {
                    logger.warn(msg, e);
                } else {
                    logger.warn(msg);
                }
            }

            String version = props.getProperty("version", "").trim();

            if (!version.startsWith("${")) {
                mavenVersion = version;
            } else {
                mavenVersion = "";
            }
        }

        return mavenVersion;
    }

    public boolean isMavenVersion(String versionRange) {
        VersionScheme versionScheme = new GenericVersionScheme();

        Validate.notBlank(versionRange, "versionRange can neither be null, empty nor blank");

        VersionConstraint constraint;
        try {
            constraint = versionScheme.parseVersionConstraint(versionRange);
        } catch (InvalidVersionSpecificationException e) {
            throw new IllegalArgumentException(e.getMessage(), e);
        }

        Version current;
        try {
            String mavenVersion = getMavenVersion();
            Validate.validState(StringUtils.isNotEmpty(mavenVersion), "Could not determine current Maven version");

            current = versionScheme.parseVersion(mavenVersion);
        } catch (InvalidVersionSpecificationException e) {
            throw new IllegalStateException("Could not parse current Maven version: " + e.getMessage(), e);
        }

        if (constraint.getRange() == null) {
            return constraint.getVersion().compareTo(current) <= 0;
        }
        return constraint.containsVersion(current);
    }
}
