/*
 * Copyright 2020-2030 码匠君<herodotus@aliyun.com>
 *
 * Dante Engine 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.
 *
 * Dante Engine 是 Dante Cloud 系统核心组件库，采用 APACHE LICENSE 2.0 开源协议，您在使用过程中，需要注意以下几点：
 *
 * 1. 请不要删除和修改根目录下的LICENSE文件。
 * 2. 请不要删除和修改 Dante Engine 源码头部的版权声明。
 * 3. 请保留源码和相关描述文件的项目出处，作者声明等。
 * 4. 分发源码时候，请注明软件出处 <https://gitee.com/dromara/dante-cloud>
 * 5. 在修改包名，模块名称，项目代码等时，请注明软件出处 <https://gitee.com/dromara/dante-cloud>
 * 6. 若您的项目无法满足以上几点，可申请商业授权
 */

package org.dromara.dante.reactive.container.autoconfigure;

import jakarta.annotation.PostConstruct;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.boot.autoconfigure.AutoConfiguration;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
import org.springframework.boot.autoconfigure.condition.SearchStrategy;
import org.springframework.boot.autoconfigure.web.WebProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.boot.webflux.autoconfigure.error.ErrorWebFluxAutoConfiguration;
import org.springframework.boot.webflux.error.DefaultErrorAttributes;
import org.springframework.boot.webflux.error.ErrorAttributes;
import org.springframework.boot.webflux.error.ErrorWebExceptionHandler;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.core.annotation.Order;
import org.springframework.http.codec.ServerCodecConfigurer;
import org.springframework.web.reactive.config.WebFluxConfigurer;
import org.springframework.web.reactive.result.view.ViewResolver;

/**
 * <p>Description: WebFlux 全局错误处理配置 </p>
 * <p>
 * 我们设置 handler 的 order 为 -2。这是为了给它一个比默认 handler，也就是 DefaultErrorWebExceptionHandler 一个更高的优先级，它设置的 order 为 -1。
 *
 * @author : gengwei.zheng
 * @date : 2024/5/1 22:22
 */
@AutoConfiguration(before = ErrorWebFluxAutoConfiguration.class)
@ConditionalOnWebApplication(type = ConditionalOnWebApplication.Type.REACTIVE)
@ConditionalOnClass(WebFluxConfigurer.class)
@EnableConfigurationProperties({WebProperties.class})
public class ReactiveWebExceptionAutoConfiguration {

    private static final Logger log = LoggerFactory.getLogger(ReactiveWebExceptionAutoConfiguration.class);

    @PostConstruct
    public void postConstruct() {
        log.info("[Herodotus] |- Auto [Reactive Web Exception] Configure.");
    }

    @Bean
    @ConditionalOnMissingBean(search = SearchStrategy.CURRENT)
    @Order(-2)
    public ErrorWebExceptionHandler errorWebExceptionHandler(
            ErrorAttributes errorAttributes,
            WebProperties webProperties,
            ObjectProvider<ViewResolver> viewResolvers,
            ServerCodecConfigurer serverCodecConfigurer,
            ApplicationContext applicationContext) {
        HerodotusGlobalErrorWebExceptionHandler handler = new HerodotusGlobalErrorWebExceptionHandler(errorAttributes, webProperties.getResources(), webProperties.getError(), applicationContext);
        handler.setViewResolvers(viewResolvers.orderedStream().toList());
        handler.setMessageWriters(serverCodecConfigurer.getWriters());
        handler.setMessageReaders(serverCodecConfigurer.getReaders());
        return handler;
    }

    @Bean
    @ConditionalOnMissingBean(value = ErrorAttributes.class, search = SearchStrategy.CURRENT)
    public DefaultErrorAttributes errorAttributes() {
        return new DefaultErrorAttributes();
    }
}
