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package com.ideaaedi.commonspring.injector;

import lombok.Getter;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.SmartInitializingSingleton;
import org.springframework.beans.factory.config.AutowireCapableBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.lang.NonNull;

import java.util.Objects;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;

/**
 * 对普通bean(即:非spring-bean)的autowired注入支持
 *  *     使用方式一：
 *         User user = new User();
 *         // 直接使用ExtAutowiredInjector.inject注入
 *         ExtAutowiredInjector.inject(user);
 *         user.sayHello();
 *     使用方式二：
 *        // 直接继承ExtAutowiredInjector
 *        public class User extends ExtAutowiredInjector {
 *        User user = new User();
 *        user.sayHello();
 * 
 *
 * @author JustryDeng 
 * @since 1.0.0
 */
@Slf4j
public abstract class ExtAutowiredInjector {
    
    public ExtAutowiredInjector() {
        Object obj = applyAutowired();
        ExtAutowiredInjector.inject(obj);
    }
    
    /**
     * 对返回的object进行autowired注入处理
     *
     * @return 要进行注入处理的Object
     */
    protected Object applyAutowired() {
        return this;
    }
    
    /**
     * 对目标对象中的被@Auwired标注了的字段进行注入
     *
     * @param obj
     *            目标obj
     */
    public static void inject(Object obj) {
        if (obj == null) {
            log.warn("obj is null, skip inject.");
            return;
        }
        if (ExtAutowiredInjectorProcessor.applicationContext != null) {
            ExtAutowiredInjectorProcessor.applicationContext.publishEvent(new AutowiredInjectEvent(obj));
        } else {
            ExtAutowiredInjectorProcessor.queue.add(obj);
        }
    }
    
    /**
     * Autowired注入支持事件
     *
     * @author JustryDeng 
     * @since 1.0.0
     */
    public static class AutowiredInjectEvent extends ApplicationEvent {
        
        @Getter
        private final Object bean;
        
        /**
         * Create a new ApplicationEvent.
         *
         * @param source
         *         the object on which the event initially occurred (never {@code null})
         */
        public AutowiredInjectEvent(Object source) {
            super(source);
            Objects.requireNonNull(source, "source cannot be null.");
            this.bean = source;
        }
    }
    
    /**
     * {@link ExtAutowiredInjector}处理器
     *
     * @author JustryDeng 
     * @since 1.0.0
     */
    @Slf4j
    public static class ExtAutowiredInjectorProcessor implements SmartInitializingSingleton, ApplicationListener {
        
        static ApplicationContext applicationContext;
        
        static Queue