/*
 * 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.services.clientregistration.policy.impl;

import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;

import org.keycloak.component.ComponentModel;
import org.keycloak.models.ClientTemplateModel;
import org.keycloak.models.KeycloakSession;
import org.keycloak.models.RealmModel;
import org.keycloak.provider.ProviderConfigProperty;
import org.keycloak.services.clientregistration.policy.AbstractClientRegistrationPolicyFactory;
import org.keycloak.services.clientregistration.policy.ClientRegistrationPolicy;

/**
 * @author <a href="mailto:mposolda@redhat.com">Marek Posolda</a>
 */
public class ClientTemplatesClientRegistrationPolicyFactory extends AbstractClientRegistrationPolicyFactory {

    private List<ProviderConfigProperty> configProperties;

    public static final String PROVIDER_ID = "allowed-client-templates";

    public static final String ALLOWED_CLIENT_TEMPLATES = "allowed-client-templates";

    @Override
    public ClientRegistrationPolicy create(KeycloakSession session, ComponentModel model) {
        return new ClientTemplatesClientRegistrationPolicy(session, model);
    }

    @Override
    public String getHelpText() {
        return "When present, it allows to specify whitelist of client templates, which will be allowed in representation of registered (or updated) client";
    }

    @Override
    public List<ProviderConfigProperty> getConfigProperties(KeycloakSession session) {
        ProviderConfigProperty property;
        property = new ProviderConfigProperty();
        property.setName(ALLOWED_CLIENT_TEMPLATES);
        property.setLabel("allowed-client-templates.label");
        property.setHelpText("allowed-client-templates.tooltip");
        property.setType(ProviderConfigProperty.MULTIVALUED_LIST_TYPE);

        if (session != null) {
            property.setOptions(getClientTemplates(session));
        }

        configProperties = Collections.singletonList(property);

        return configProperties;
    }

    private List<String> getClientTemplates(KeycloakSession session) {
        RealmModel realm = session.getContext().getRealm();
        if (realm == null) {
            return Collections.emptyList();
        } else {
            List<ClientTemplateModel> clientTemplates = realm.getClientTemplates();

            return clientTemplates.stream().map((ClientTemplateModel clientTemplate) -> {

                return clientTemplate.getName();

            }).collect(Collectors.toList());
        }
    }

    @Override
    public List<ProviderConfigProperty> getConfigProperties() {
        return getConfigProperties(null);
    }

    @Override
    public String getId() {
        return PROVIDER_ID;
    }
}