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/*
 * Copyright 2017-2023 original authors
 *
 * 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
 *
 * https://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 io.micronaut.security.oauth2.client.clientcredentials;

import io.micronaut.context.BeanProvider;
import io.micronaut.context.annotation.EachBean;
import io.micronaut.context.annotation.Factory;
import io.micronaut.context.annotation.Parameter;
import io.micronaut.context.annotation.Requires;
import io.micronaut.context.exceptions.DisabledBeanException;
import io.micronaut.core.annotation.Nullable;
import io.micronaut.core.util.SupplierUtil;
import io.micronaut.security.oauth2.client.DefaultOpenIdProviderMetadata;
import io.micronaut.security.oauth2.client.OpenIdProviderMetadata;
import io.micronaut.security.oauth2.configuration.OauthClientConfiguration;
import io.micronaut.security.oauth2.configuration.endpoints.EndpointConfiguration;
import io.micronaut.security.oauth2.endpoint.token.request.TokenEndpointClient;
import java.util.function.Supplier;

/**
 * Factory to create {@link ClientCredentialsClient} beans.
 * @author Sergio del Amo
 * @since 2.2.0
 */
@Factory
public class ClientCredentialsFactory {

    /**
     * Creates an {@link ClientCredentialsClient} from the provided parameters.
     * @param oauthClientConfiguration The client configuration
     * @param tokenEndpointClient Token endpoint client
     * @param openIdProviderMetadata The open id provider metadata
     * @return The Client Credentials client
     */
    @EachBean(OauthClientConfiguration.class)
    @Requires(condition = ClientCredentialsEnabled.class)
    ClientCredentialsClient clientCredentialsOpenIdClient(@Parameter OauthClientConfiguration oauthClientConfiguration,
                                                          TokenEndpointClient tokenEndpointClient,
                                                          @Parameter @Nullable BeanProvider openIdProviderMetadata) {

        if (openIdProviderMetadata != null) {
            Supplier metadataSupplier = SupplierUtil.memoized(openIdProviderMetadata::get);
            return new DefaultClientCredentialsOpenIdClient(oauthClientConfiguration,
                    tokenEndpointClient,
                    metadataSupplier);
        } else {
            if (oauthClientConfiguration.getToken().flatMap(EndpointConfiguration::getUrl).isPresent()) {
                return new DefaultClientCredentialsClient(oauthClientConfiguration, tokenEndpointClient);
            } else {
                throw new DisabledBeanException("Client credentials grant is disabled for OAuth 2.0 client [\"" + oauthClientConfiguration.getName() + "\"] because no token endpoint is configured");
            }
        }
    }
}