package com.ag.secp.platform.spring;

import org.apache.commons.lang3.Validate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.core.io.DefaultResourceLoader;

import java.io.IOException;

public class SpringContextHolder implements ApplicationContextAware, DisposableBean {

    private static ApplicationContext applicationContext = null;

    private static final Logger logger = LoggerFactory.getLogger(SpringContextHolder.class);

    /**
     * 取得存储在静态变量中的ApplicationContext.
     *
     * @return
     */
    public static ApplicationContext getApplicationContext() {
        assertContextInjected();
        return applicationContext;
    }

    /**
     * 获取系统根目录
     *
     * @return
     */
    public static String getRootRealPath() {
        String rootRealPath = "";
        try {
            rootRealPath = getApplicationContext().getResource("").getFile().getAbsolutePath();
        } catch (IOException e) {
            logger.warn("获取系统根目录失败");
        }
        return rootRealPath;
    }

    /**
     * 获取系统资源根目录
     *
     * @return
     */
    public static String getResourceRootRealPath() {
        String rootRealPath = "";
        try {
            rootRealPath = new DefaultResourceLoader().getResource("").getFile().getAbsolutePath();
        } catch (IOException e) {
            logger.warn("获取资源根目录失败");
        }
        return rootRealPath;
    }

    /**
     * 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型
     *
     * @param <T>
     * @param name
     * @return
     */
    @SuppressWarnings("unchecked")
    public static <T> T getBean(String name) {
        assertContextInjected();
        return (T) applicationContext.getBean(name);
    }

    /**
     * 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型
     *
     * @param <T>
     * @param requiredType
     * @return

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

    /**
     * 清除SpringContextHolder中的ApplicationContext为Null
     */
    public static void clearHolder() {
        if (logger.isDebugEnabled()) {
            logger.debug("清除SpringContextHolder中的ApplicationContext:" + applicationContext);
        }
        applicationContext = null;
    }

    /**
     * 实现ApplicationContextAware接口, 注入Context到静态变量中
     *
     * @param applicationContext
     */
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) {
        if (SpringContextHolder.applicationContext != null) {
            logger.info("SpringContextHolder中的ApplicationContext被覆盖, 原有ApplicationContext为:" + SpringContextHolder.applicationContext);
        }

        SpringContextHolder.applicationContext = applicationContext; // NOSONAR
    }

    /**
     * 实现DisposableBean接口, 在Context关闭时清理静态变量
     *
     * @throws Exception
     */
    @Override
    public void destroy() throws Exception {
        SpringContextHolder.clearHolder();
    }
    public static boolean containsBean(String bean) {
        assertContextInjected();
        return applicationContext.containsBean(bean);
    }
    /**
     * 检查ApplicationContext不为空
     */
    private static void assertContextInjected() {
        Validate.validState(applicationContext != null, "applicaitonContext属性未注入, 请在applicationContext.xml中定义SpringContextHolder.");
    }
}
