/*******************************************************************************
 * Copyright (c) 2008, 2011 Sonatype 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
 *
 * Contributors:
 *    Sonatype Inc. - initial API and implementation
 *******************************************************************************/
package org.eclipse.tycho.core.resolver;

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

import org.apache.maven.project.MavenProject;
import org.codehaus.plexus.PlexusContainer;
import org.codehaus.plexus.component.annotations.Component;
import org.codehaus.plexus.component.annotations.Requirement;
import org.codehaus.plexus.component.repository.exception.ComponentLookupException;
import org.codehaus.plexus.logging.Logger;
import org.eclipse.tycho.core.DependencyResolver;
import org.eclipse.tycho.core.TargetPlatformConfiguration;
import org.eclipse.tycho.core.TychoConstants;
import org.eclipse.tycho.core.osgitools.targetplatform.LocalDependencyResolver;
import org.eclipse.tycho.core.utils.TychoProjectUtils;

@Component(role = DefaultDependencyResolverFactory.class)
public class DefaultDependencyResolverFactory {
    private static final String DEFAULT_RESOLVER_HINT = "p2";

    @Requirement
    private Logger logger;

    @Requirement
    private PlexusContainer container;

    public DependencyResolver lookupDependencyResolver(MavenProject project) {
        Properties properties = (Properties) project.getContextValue(TychoConstants.CTX_MERGED_PROPERTIES);
        TargetPlatformConfiguration configuration = TychoProjectUtils.getTargetPlatformConfiguration(project);

        String property = properties.getProperty("tycho.targetPlatform");
        DependencyResolver resolver;
        if (property != null) {
            logger.warn("-Dtycho.targetPlatform is deprecated and WILL be removed in the next Tycho version.");

            File location = new File(property);
            if (!location.exists() || !location.isDirectory()) {
                throw new RuntimeException("Invalid target platform location: " + property);
            }

            try {
                resolver = container.lookup(DependencyResolver.class, LocalDependencyResolver.ROLE_HINT);
            } catch (ComponentLookupException e) {
                throw new RuntimeException("Could not instantiate required component", e);
            }

            try {
                ((LocalDependencyResolver) resolver).setLocation(new File(property));
            } catch (IOException e) {
                throw new RuntimeException("Could not create target platform", e);
            }

            return resolver;
        }

        String resolverRole = configuration.getTargetPlatformResolver();
        if (resolverRole == null) {
            resolverRole = DEFAULT_RESOLVER_HINT;
        }

        try {
            resolver = container.lookup(DependencyResolver.class, resolverRole);
        } catch (ComponentLookupException e) {
            throw new RuntimeException("Could not instantiate required component", e);
        }

        return resolver;
    }
}