/**
 * DataCleaner (community edition)
 * Copyright (C) 2014 Neopost - Customer Information Management
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.datacleaner.util.convert;

import org.apache.metamodel.util.Resource;
import org.datacleaner.repository.Repository;
import org.datacleaner.repository.RepositoryFileResource;
import org.datacleaner.repository.RepositoryFolder;
import org.datacleaner.util.ReflectionUtils;
import org.datacleaner.util.convert.ResourceConverter.ResourceTypeHandler;

/**
 * {@link ResourceTypeHandler} for {@link RepositoryFileResource}s.
 *
 * Unlike most other {@link ResourceTypeHandler}s, this one is contextual, since
 * it needs a reference to the repository of the system and it is also specific
 * to a single tenant to ensure isolation between loaded repository content.
 */
public class RepositoryFileResourceTypeHandler implements ResourceTypeHandler<RepositoryFileResource> {

    private final Repository _repository;
    private final RepositoryFolder _homeFolder;

    public RepositoryFileResourceTypeHandler(final Repository repository, final RepositoryFolder homeFolder) {
        _repository = repository;
        _homeFolder = homeFolder;
    }

    public RepositoryFileResourceTypeHandler(final Repository repository, final String tenantId) {
        _repository = repository;
        _homeFolder = repository.getFolder(tenantId);
    }

    @Override
    public boolean isParserFor(final Class<? extends Resource> cls) {
        return ReflectionUtils.is(cls, RepositoryFileResource.class);
    }

    @Override
    public String createPath(final Resource resource) {
        final RepositoryFileResource repositoryFileResource = (RepositoryFileResource) resource;
        final String qualifiedPath = repositoryFileResource.getQualifiedPath();
        final String prefix = getHomeFolderPrefix();
        if (!qualifiedPath.startsWith(prefix)) {
            throw new IllegalArgumentException(
                    "This RepositoryFileResourceTypeHandler can only handle repository file from home '" + prefix
                            + "'. Got: " + qualifiedPath);
        }

        return qualifiedPath.substring(prefix.length());
    }

    private String getHomeFolderPrefix() {
        final String homeFolderPath = _homeFolder.getQualifiedPath();
        if ("/".equals(homeFolderPath)) {
            return homeFolderPath;
        }
        return homeFolderPath + "/";
    }

    @Override
    public String getScheme() {
        return "repo";
    }

    @Override
    public RepositoryFileResource parsePath(final String path) {
        final String qualifiedPath = getHomeFolderPrefix() + path;
        return new RepositoryFileResource(_repository, qualifiedPath);
    }

}