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package io.github.linpeilie.mapstruct;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.ListableBeanFactory;
import org.springframework.beans.factory.NoUniqueBeanDefinitionException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ConfigurableApplicationContext;

public class SpringContextUtils implements BeanFactoryPostProcessor, ApplicationContextAware {

    private static ConfigurableListableBeanFactory beanFactory;
    private static ApplicationContext applicationContext;

    public SpringContextUtils() {
    }

    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
        SpringContextUtils.beanFactory = beanFactory;
    }

    public void setApplicationContext(ApplicationContext applicationContext) {
        SpringContextUtils.applicationContext = applicationContext;
    }

    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    public static ListableBeanFactory getBeanFactory() {
        ListableBeanFactory factory = null == beanFactory ? applicationContext : beanFactory;
        if (null == factory) {
            throw new RuntimeException("No ConfigurableListableBeanFactory or ApplicationContext injected, maybe not in the Spring environment?");
        } else {
            return (ListableBeanFactory)factory;
        }
    }

    public static ConfigurableListableBeanFactory getConfigurableBeanFactory() {
        ConfigurableListableBeanFactory factory;
        if (null != beanFactory) {
            factory = beanFactory;
        } else {
            if (!(applicationContext instanceof ConfigurableApplicationContext)) {
                throw new RuntimeException("No ConfigurableListableBeanFactory from context!");
            }

            factory = ((ConfigurableApplicationContext)applicationContext).getBeanFactory();
        }

        return factory;
    }

    public static  T getBean(Class clazz) {
        return getBeanFactory().getBean(clazz);
    }

    public static  T getBean(String name, Class clazz) {
        try {
            return getBean(clazz);
        } catch (NoUniqueBeanDefinitionException e) {
            return getBeanFactory().getBean(name, clazz);
        }
    }

}