/*
 * JBoss, Home of Professional Open Source
 * Copyright 2011 Red Hat Inc. and/or its affiliates and other contributors
 * as indicated by the @authors tag. All rights reserved.
 * See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * 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, v. 2.1.
 * This program is distributed in the hope that it will be useful, but WITHOUT A
 * 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,
 * v.2.1 along with this distribution; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA  02110-1301, USA.
 */
package org.jboss.as.host.controller.operations;


import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.DOMAIN_CONTROLLER;
import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.LOCAL;
import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.REMOTE;
import static org.jboss.dmr.ModelType.STRING;

import java.util.HashMap;
import java.util.Map;

import org.jboss.as.controller.OperationContext;
import org.jboss.as.controller.OperationDefinition;
import org.jboss.as.controller.OperationFailedException;
import org.jboss.as.controller.OperationStepHandler;
import org.jboss.as.controller.PathAddress;
import org.jboss.as.controller.SimpleAttributeDefinition;
import org.jboss.as.controller.SimpleAttributeDefinitionBuilder;
import org.jboss.as.controller.SimpleOperationDefinitionBuilder;
import org.jboss.as.controller.access.constraint.management.SensitiveTargetAccessConstraintDefinition;
import org.jboss.as.controller.descriptions.ModelDescriptionConstants;
import org.jboss.as.controller.extension.ExtensionRegistry;
import org.jboss.as.controller.operations.validation.IntRangeValidator;
import org.jboss.as.controller.operations.validation.StringLengthValidator;
import org.jboss.as.controller.registry.AttributeAccess;
import org.jboss.as.controller.registry.ManagementResourceRegistration;
import org.jboss.as.controller.registry.Resource;
import org.jboss.as.controller.services.path.PathManagerService;
import org.jboss.as.domain.controller.DomainController;
import org.jboss.as.host.controller.HostControllerConfigurationPersister;
import org.jboss.as.host.controller.descriptions.HostResolver;
import org.jboss.as.host.controller.discovery.StaticDiscovery;
import org.jboss.as.host.controller.ignored.IgnoredDomainResourceRegistry;
import org.jboss.as.repository.ContentRepository;
import org.jboss.as.repository.HostFileRepository;
import org.jboss.dmr.ModelNode;
import org.jboss.dmr.ModelType;

/**
 * @author <a href="kabir.khan@jboss.com">Kabir Khan</a>
 * @author <a href="mailto:darran.lofthouse@jboss.com">Darran Lofthouse</a>
 */
public class RemoteDomainControllerAddHandler implements OperationStepHandler {

    public static final String OPERATION_NAME = "write-remote-domain-controller";

    public static final SimpleAttributeDefinition PORT = new SimpleAttributeDefinitionBuilder(ModelDescriptionConstants.PORT, ModelType.INT)
            .setAllowExpression(true)
            .setValidator(new IntRangeValidator(1, 65535, false, true))
            .setFlags(AttributeAccess.Flag.RESTART_JVM)
            .build();

    public static final SimpleAttributeDefinition HOST = new SimpleAttributeDefinitionBuilder(ModelDescriptionConstants.HOST, ModelType.STRING)
            .setAllowExpression(true)
            .setValidator(new StringLengthValidator(1, Integer.MAX_VALUE, false, true))
            .setFlags(AttributeAccess.Flag.RESTART_JVM)
            .build();

    public static final SimpleAttributeDefinition USERNAME = new SimpleAttributeDefinitionBuilder(ModelDescriptionConstants.USERNAME, STRING, true)
            .setAllowExpression(true)
            .setValidator(new StringLengthValidator(1, Integer.MAX_VALUE, true, true))
            .setFlags(AttributeAccess.Flag.RESTART_JVM).build();

    public static final SimpleAttributeDefinition SECURITY_REALM = new SimpleAttributeDefinitionBuilder(ModelDescriptionConstants.SECURITY_REALM, STRING, true)
            .setValidator(new StringLengthValidator(1, true))
            .build();

    public static final SimpleAttributeDefinition IGNORE_UNUSED_CONFIG = new SimpleAttributeDefinitionBuilder(ModelDescriptionConstants.IGNORE_UNUSED_CONFIG, ModelType.BOOLEAN, true)
            .setAllowExpression(true)
            .setFlags(AttributeAccess.Flag.RESTART_JVM)
            .setDefaultValue(new ModelNode(false))
            .build();

    public static final OperationDefinition DEFINITION = new SimpleOperationDefinitionBuilder(OPERATION_NAME, HostResolver.getResolver("host"))
            .setParameters(PORT, HOST, USERNAME, SECURITY_REALM, IGNORE_UNUSED_CONFIG)
            .addAccessConstraint(SensitiveTargetAccessConstraintDefinition.DOMAIN_CONTROLLER)
            .build();

    private final ManagementResourceRegistration rootRegistration;
    private final DomainController domainController;
    private final HostControllerConfigurationPersister overallConfigPersister;
    private final ContentRepository contentRepository;
    private final HostFileRepository fileRepository;
    private final LocalHostControllerInfoImpl hostControllerInfo;
    private final ExtensionRegistry extensionRegistry;
    private final IgnoredDomainResourceRegistry ignoredDomainResourceRegistry;
    private final PathManagerService pathManager;

    public RemoteDomainControllerAddHandler(final ManagementResourceRegistration rootRegistration,
                                               final LocalHostControllerInfoImpl hostControllerInfo,
                                               final DomainController domainController,
                                               final HostControllerConfigurationPersister overallConfigPersister,
                                               final ContentRepository contentRepository,
                                               final HostFileRepository fileRepository,
                                               final ExtensionRegistry extensionRegistry,
                                               final IgnoredDomainResourceRegistry ignoredDomainResourceRegistry,
                                               final PathManagerService pathManager) {
        this.rootRegistration = rootRegistration;
        this.domainController = domainController;
        this.overallConfigPersister = overallConfigPersister;
        this.contentRepository = contentRepository;
        this.fileRepository = fileRepository;
        this.hostControllerInfo = hostControllerInfo;
        this.extensionRegistry = extensionRegistry;
        this.ignoredDomainResourceRegistry = ignoredDomainResourceRegistry;
        this.pathManager = pathManager;
    }

    @Override
    public void execute(OperationContext context, ModelNode operation) throws OperationFailedException {
        final Resource resource = context.readResourceForUpdate(PathAddress.EMPTY_ADDRESS);
        final ModelNode model = resource.getModel();
        ModelNode dc = model.get(DOMAIN_CONTROLLER);
        ModelNode remoteDC = dc.get(REMOTE);

        PORT.validateAndSet(operation, remoteDC);
        HOST.validateAndSet(operation, remoteDC);
        USERNAME.validateAndSet(operation, remoteDC);
        IGNORE_UNUSED_CONFIG.validateAndSet(operation, remoteDC);

        if (operation.has(SECURITY_REALM.getName())) {
            SECURITY_REALM.validateAndSet(operation, remoteDC);
            hostControllerInfo.setRemoteDomainControllerSecurityRealm(SECURITY_REALM.resolveModelAttribute(context, operation).asString());
        } else {
            remoteDC.get(SECURITY_REALM.getName()).clear();
        }

        if (dc.has(LOCAL)) {
            dc.remove(LOCAL);
        }

        if (context.isBooting()) {
            initializeDomain(context, remoteDC);
        } else {
            context.reloadRequired();
        }

        context.completeStep(new OperationContext.RollbackHandler() {
            @Override
            public void handleRollback(OperationContext context, ModelNode operation) {
                if (!context.isBooting()) {
                    context.revertReloadRequired();
                }
            }
        });
    }

    protected void initializeDomain(OperationContext context, ModelNode remoteDC) throws OperationFailedException {
        hostControllerInfo.setMasterDomainController(false);
        ModelNode hostNode = RemoteDomainControllerAddHandler.HOST.resolveModelAttribute(context, remoteDC);
        ModelNode portNode = RemoteDomainControllerAddHandler.PORT.resolveModelAttribute(context, remoteDC);
        if (hostNode.isDefined() && portNode.isDefined()) {
            // Create a StaticDiscovery option and add it to the host controller info
            Map<String, ModelNode> properties = new HashMap<String, ModelNode>();
            properties.put(ModelDescriptionConstants.HOST, hostNode);
            properties.put(ModelDescriptionConstants.PORT, portNode);
            StaticDiscovery staticDiscoveryOption = new StaticDiscovery(properties);
            hostControllerInfo.addRemoteDomainControllerDiscoveryOption(staticDiscoveryOption);
        }
        ModelNode usernameNode = USERNAME.resolveModelAttribute(context, remoteDC);
        if (usernameNode.isDefined()) {
            hostControllerInfo.setRemoteDomainControllerUsername(usernameNode.asString());
        }

        hostControllerInfo.setRemoteDomainControllerIgnoreUnaffectedConfiguration(IGNORE_UNUSED_CONFIG.resolveModelAttribute(context, remoteDC).asBoolean());
        overallConfigPersister.initializeDomainConfigurationPersister(true);

        domainController.initializeSlaveDomainRegistry(rootRegistration, overallConfigPersister.getDomainPersister(), contentRepository, fileRepository,
                hostControllerInfo, extensionRegistry, ignoredDomainResourceRegistry, pathManager);
    }
}
