/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags.
 *
 * 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.keycloak.partialimport;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.keycloak.models.ClientModel;
import org.keycloak.models.Constants;
import org.keycloak.models.KeycloakSession;
import org.keycloak.models.RealmModel;
import org.keycloak.models.UserModel;
import org.keycloak.models.utils.KeycloakModelUtils;
import org.keycloak.models.utils.RepresentationToModel;
import org.keycloak.protocol.oidc.OIDCAdvancedConfigWrapper;
import org.keycloak.representations.idm.ClientRepresentation;
import org.keycloak.representations.idm.PartialImportRepresentation;
import org.keycloak.representations.idm.ProtocolMapperRepresentation;

import org.jboss.logging.Logger;

/**
 * PartialImport handler for Clients.
 *
 * @author Stan Silvert ssilvert@redhat.com (C) 2016 Red Hat Inc.
 */
public class ClientsPartialImport extends AbstractPartialImport<ClientRepresentation> {

    private static Set<String> INTERNAL_CLIENTS = Collections.unmodifiableSet(new HashSet(Constants.defaultClients));

    private static Logger logger = Logger.getLogger(ClientsPartialImport.class);

    @Override
    public List<ClientRepresentation> getRepList(PartialImportRepresentation partialImportRep) {
        List<ClientRepresentation> clients = partialImportRep.getClients();
        if (clients == null || clients.size() == 0) {
            return clients;
        }

        // filter out internal clients
        List<ClientRepresentation> ret = new ArrayList();

        for (ClientRepresentation c: clients) {
            if (!isInternalClient(c.getClientId())) {
                ret.add(c);
            } else {
                logger.debugv("Internal client {0} will not be processed", c.getClientId());
            }
        }
        return ret;
    }

    @Override
    public String getName(ClientRepresentation clientRep) {
        return clientRep.getClientId();
    }

    @Override
    public String getModelId(RealmModel realm, KeycloakSession session, ClientRepresentation clientRep) {
        return realm.getClientByClientId(getName(clientRep)).getId();
    }

    @Override
    public boolean exists(RealmModel realm, KeycloakSession session, ClientRepresentation clientRep) {
        return realm.getClientByClientId(getName(clientRep)) != null;
    }

    @Override
    public String existsMessage(RealmModel realm, ClientRepresentation clientRep) {
        return "Client id '" + getName(clientRep) + "' already exists";
    }

    @Override
    public ResourceType getResourceType() {
        return ResourceType.CLIENT;
    }

    @Override
    public void remove(RealmModel realm, KeycloakSession session, ClientRepresentation clientRep) {
        ClientModel clientModel = realm.getClientByClientId(getName(clientRep));
        // remove the associated service account if the account exists
        if (clientModel.isServiceAccountsEnabled()) {
            UserModel serviceAccountUser = session.users().getServiceAccount(clientModel);
            if (serviceAccountUser != null) {
                session.users().removeUser(realm, serviceAccountUser);
            }
        }
        // the authorization resource server seems to be removed using the delete event, so it's not needed
        // remove the client itself
        realm.removeClient(clientModel.getId());
    }

    @Override
    public void create(RealmModel realm, KeycloakSession session, ClientRepresentation clientRep) {
        clientRep.setId(KeycloakModelUtils.generateId());

        List<ProtocolMapperRepresentation> mappers = clientRep.getProtocolMappers();
        if (mappers != null) {
            for (ProtocolMapperRepresentation mapper : mappers) {
                mapper.setId(KeycloakModelUtils.generateId());
            }
        }

        ClientModel client = RepresentationToModel.createClient(session, realm, clientRep);
        if(OIDCAdvancedConfigWrapper.fromClientModel(client).getPostLogoutRedirectUris() == null) {
            OIDCAdvancedConfigWrapper.fromClientModel(client).setPostLogoutRedirectUris(Collections.singletonList("+"));
        }
        RepresentationToModel.importAuthorizationSettings(clientRep, client, session);
    }

    public static boolean isInternalClient(String clientId) {
        if (clientId != null && clientId.endsWith("-realm")) {
            return true;
        }
        return INTERNAL_CLIENTS.contains(clientId);
    }
}
