/*
 * Copyright 2017 Red Hat, Inc.
 *
 * Licensed 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.wildfly.extension.microprofile.config;

import org.eclipse.microprofile.config.spi.ConfigSource;
import org.eclipse.microprofile.config.spi.ConfigSourceProvider;
import org.jboss.as.controller.Extension;
import org.jboss.as.controller.ExtensionContext;
import org.jboss.as.controller.ModelVersion;
import org.jboss.as.controller.PathElement;
import org.jboss.as.controller.SubsystemRegistration;
import org.jboss.as.controller.descriptions.ResourceDescriptionResolver;
import org.jboss.as.controller.descriptions.StandardResourceDescriptionResolver;
import org.jboss.as.controller.operations.common.GenericSubsystemDescribeHandler;
import org.jboss.as.controller.parsing.ExtensionParsingContext;
import org.jboss.as.controller.registry.ManagementResourceRegistration;

import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.SUBSYSTEM;

/**
 * @author <a href="kabir.khan@jboss.com">Kabir Khan</a>
 */
public class SubsystemExtension implements Extension {

    /**
     * The name of our subsystem within the model.
     */
    public static final String SUBSYSTEM_NAME = "microprofile-config";

    protected static final PathElement SUBSYSTEM_PATH = PathElement.pathElement(SUBSYSTEM, SUBSYSTEM_NAME);
    protected static final PathElement CONFIG_SOURCE_PATH = PathElement.pathElement("config-source");
    protected static final PathElement CONFIG_SOURCE_PROVIDER_PATH = PathElement.pathElement("config-source-provider");

    private static final String RESOURCE_NAME = SubsystemExtension.class.getPackage().getName() + ".LocalDescriptions";

    protected static final ModelVersion VERSION_1_0_0 = ModelVersion.create(1, 0, 0);
    private static final ModelVersion CURRENT_MODEL_VERSION = VERSION_1_0_0;

    private static final SubsystemParser_1_0 CURRENT_PARSER = new SubsystemParser_1_0();

    static ResourceDescriptionResolver getResourceDescriptionResolver(final String... keyPrefix) {
        return getResourceDescriptionResolver(true, keyPrefix);
    }

    static ResourceDescriptionResolver getResourceDescriptionResolver(final boolean useUnprefixedChildTypes, final String... keyPrefix) {
        StringBuilder prefix = new StringBuilder();
        for (String kp : keyPrefix) {
            if (prefix.length() > 0){
                prefix.append('.');
            }
            prefix.append(kp);
        }
        return new StandardResourceDescriptionResolver(prefix.toString(), RESOURCE_NAME, SubsystemExtension.class.getClassLoader(), true, useUnprefixedChildTypes);
    }
    @Override
    public void initialize(ExtensionContext context) {
        final SubsystemRegistration subsystem = context.registerSubsystem(SUBSYSTEM_NAME, CURRENT_MODEL_VERSION);
        subsystem.registerXMLElementWriter(CURRENT_PARSER);

        IterableRegistry<ConfigSourceProvider> providers = new IterableRegistry<>();
        IterableRegistry<ConfigSource> sources = new IterableRegistry<>();

        final ManagementResourceRegistration registration = subsystem.registerSubsystemModel(new SubsystemDefinition(providers, sources));
        registration.registerOperationHandler(GenericSubsystemDescribeHandler.DEFINITION, GenericSubsystemDescribeHandler.INSTANCE);

        registration.registerSubModel(new ConfigSourceDefinition(sources));
        registration.registerSubModel(new ConfigSourceProviderDefinition(providers));
    }

    public void initializeParsers(ExtensionParsingContext context) {
        context.setSubsystemXmlMapping(SUBSYSTEM_NAME, SubsystemParser_1_0.NAMESPACE, CURRENT_PARSER);
    }

}
