package com.casic.util;

import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.BeanDefinitionReaderUtils;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;

import java.util.List;
import java.util.Map;
import java.util.concurrent.ForkJoinPool;
import java.util.function.Function;

/**
 * @Description: Spring应用上下文工具
 * @Author: wangpeng
 * @Date: 2022/8/11 18:04
 */
@Component
public class SpringContextUtil implements BeanFactoryPostProcessor, ApplicationContextAware {
    /**
     *  Spring应用上下文环境
     */
    private static ApplicationContext applicationContext;

    private static ConfigurableListableBeanFactory beanFactory;

    /**
     * 实现ApplicationContextAware接口的回调方法，设置上下文环境
     */
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        SpringContextUtil.applicationContext = applicationContext;
    }

    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
        SpringContextUtil.beanFactory = beanFactory;
    }

    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

//    public static Object getBean(String beanId) throws BeansException {
//        return applicationContext.getBean(beanId);
//    }

    public static <T> T getBean(Class<T> requiredType) {
        return (T) applicationContext.getBean(requiredType);
    }

    @SuppressWarnings("unchecked")
    public static <T> T getBean(String name) throws BeansException {
        return (T) beanFactory.getBean(name);
    }

    public static boolean containsBean(String name) {
        return beanFactory.containsBean(name);
    }

    public static <T> T registerBean(String beanName, Class<T> clazz, Function<BeanDefinitionBuilder, AbstractBeanDefinition> function) {
        // 生成bean定义
        BeanDefinitionBuilder beanDefinitionBuilder = BeanDefinitionBuilder.genericBeanDefinition(clazz);
        // 执行bean处理函数
        AbstractBeanDefinition beanDefinition = function.apply(beanDefinitionBuilder);
        BeanDefinitionRegistry beanFactory = (BeanDefinitionRegistry) SpringContextUtil.beanFactory;
        // 判断是否通过beanName注册
        if (StringUtils.isNotBlank(beanName) && !containsBean(beanName)) {
            beanFactory.registerBeanDefinition(beanName, beanDefinition);
            return getBean(beanName);
        } else {
            // 非命名bean注册
            String name = BeanDefinitionReaderUtils.registerWithGeneratedName(beanDefinition, beanFactory);
            return getBean(name);
        }
    }

    public static <T> T registerBean(String beanName, Class<T> clazz, List<Object> args, Map<String, Object> property) {
        return registerBean(beanName, clazz, beanDefinitionBuilder -> {
            // 放入构造参数
            if (!CollectionUtils.isEmpty(args)) {
                args.forEach(beanDefinitionBuilder::addConstructorArgValue);
            }
            // 放入属性
            if (!CollectionUtils.isEmpty(property)) {
                property.forEach(beanDefinitionBuilder::addPropertyValue);
            }
            return beanDefinitionBuilder.getBeanDefinition();
        });
    }

    @Bean
    public ForkJoinPool forkJoinPool() {
        return new ForkJoinPool(100);
    }

}