/*
 * Copyright 2017 the original author or 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 org.springframework.cloud.skipper.client;

import com.fasterxml.jackson.databind.ObjectMapper;

import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.boot.web.client.RestTemplateBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.client.RestTemplate;

/**
 * Client's configuration class.
 *
 * @author Mark Pollack
 * @author Janne Valkealahti
 */
@Configuration
@EnableConfigurationProperties(SkipperClientProperties.class)
public class SkipperClientConfiguration {

	/**
	 * Default bean name for {@link RestTemplate} created by {@code SkipperClientConfiguration}.
	 */
	public final static String SKIPPERCLIENT_RESTTEMPLATE_BEAN_NAME = "skipperClientRestTemplate";

	@Bean(name = SKIPPERCLIENT_RESTTEMPLATE_BEAN_NAME)
	public RestTemplate skipperClientRestTemplate(RestTemplateBuilder restTemplateBuilder, ObjectMapper objectMapper) {
		RestTemplate restTemplate = restTemplateBuilder
				.errorHandler(new SkipperClientResponseErrorHandler(objectMapper)).build();
		return validateRestTemplate(restTemplate);
	}

	@Bean
	public SkipperClient skipperClient(SkipperClientProperties properties, RestTemplate restTemplate) {
		return new DefaultSkipperClient(properties.getServerUri(), restTemplate);
	}

	public RestTemplate validateRestTemplate(RestTemplate restTemplate) {
		boolean containsMappingJackson2HttpMessageConverter = false;

		for (HttpMessageConverter<?> converter : restTemplate.getMessageConverters()) {
			if (converter instanceof MappingJackson2HttpMessageConverter) {
				containsMappingJackson2HttpMessageConverter = true;
			}
		}

		if (!containsMappingJackson2HttpMessageConverter) {
			throw new IllegalArgumentException(
					"The RestTemplate does not contain a required " + "MappingJackson2HttpMessageConverter.");
		}
		return restTemplate;
	}

}
