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/*
 * Copyright 2018-2024 guerlab.net and other contributors.
 *
 * Licensed under the GNU LESSER GENERAL PUBLIC LICENSE, Version 3 (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.gnu.org/licenses/lgpl-3.0.html
 *
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.guerlab.cloud.web.webmvc.autoconfigure;

import java.util.ServiceLoader;
import java.util.stream.StreamSupport;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.AutoConfiguration;
import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
import org.springframework.core.convert.ConversionService;
import org.springframework.core.convert.support.GenericConversionService;
import org.springframework.web.bind.support.ConfigurableWebBindingInitializer;
import org.springframework.web.bind.support.WebBindingInitializer;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter;

import net.guerlab.cloud.core.converter.AutoLoadConverter;

/**
 * 转换自动配置.
 *
 * @author guer
 */
@AutoConfiguration
@ConditionalOnBean(RequestMappingHandlerAdapter.class)
public class ConverterAutoConfigure {

	/**
	 * 自动加载转换器.
	 *
	 * @param handlerAdapter RequestMappingHandlerAdapter
	 */
	@Autowired
	public void addConverter(RequestMappingHandlerAdapter handlerAdapter) {
		WebBindingInitializer webBindingInitializer = handlerAdapter.getWebBindingInitializer();
		if (!(webBindingInitializer instanceof ConfigurableWebBindingInitializer initializer)) {
			return;
		}

		ConversionService conversionService = initializer.getConversionService();
		if (initializer.getConversionService() == null
				|| !(conversionService instanceof GenericConversionService service)) {
			return;
		}

		StreamSupport.stream(ServiceLoader.load(AutoLoadConverter.class).spliterator(), false)
				.forEach(service::addConverter);
	}
}