/*
 * Copyright 2007-2017 the original author or authors.
 *
 * 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.
 */
package net.ymate.platform.core;

import net.ymate.platform.core.beans.BeanMeta;
 
import net.ymate.platform.core.beans.IBeanFactory;
import net.ymate.platform.core.beans.IBeanHandler;
import net.ymate.platform.core.beans.annotation.Bean;
import net.ymate.platform.core.beans.annotation.Proxy;
import net.ymate.platform.core.beans.impl.DefaultBeanFactory;
import net.ymate.platform.core.beans.impl.DefaultBeanLoader;
 
import net.ymate.platform.core.beans.impl.proxy.DefaultProxyFactory;
import net.ymate.platform.core.beans.intercept.InterceptProxy;
import net.ymate.platform.core.beans.proxy.IProxy;
import net.ymate.platform.core.beans.proxy.IProxyFactory;
import net.ymate.platform.core.event.Events;
import net.ymate.platform.core.event.annotation.EventRegister;
import net.ymate.platform.core.event.impl.DefaultEventConfig;
import net.ymate.platform.core.handle.EventRegisterHandler;
import net.ymate.platform.core.handle.ModuleHandler;
import net.ymate.platform.core.handle.ProxyHandler;
import net.ymate.platform.core.i18n.I18N;
import net.ymate.platform.core.module.IModule;
import net.ymate.platform.core.module.ModuleEvent;
import net.ymate.platform.core.module.annotation.Module;
import net.ymate.platform.core.support.ConfigBuilder;
import net.ymate.platform.core.util.RuntimeUtils;
import org.apache.commons.lang.time.StopWatch;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.lang.annotation.Annotation;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

/**
 * YMP框架核心管理器
 *
 * @author 劉鎮 ([email protected]) on 2012-12-23 下午5:52:44
 * @version 1.0
 */
public class YMP {

    public static final Version VERSION = new Version(2, 0, 1, Version.VersionType.Release);

    private static final Log _LOG = LogFactory.getLog(YMP.class);

    private static final String __YMP_BASE_PACKAGE = "net.ymate.platform";

    private static final YMP __instance = new YMP(ConfigBuilder.system().build());

    private IConfig __config;

    private boolean __inited;

    private IBeanFactory __moduleFactory;

    private IBeanFactory __beanFactory;

    private IProxyFactory __proxyFactory;

    private Map<Class<? extends IModule>, IModule> __modules;

    private Events __events;

 /**
     * @return 返回默認YMP框架核心管理器對象實例，若未實例化或已銷毀則重新創建對象實例
     */
 public static YMP get() {
        return __instance;
 }

    /**
     * 構造方法
     *
     * @param config YMP框架初始化配置
     */
 public YMP(IConfig config) {
        __config = config;
 }

    private void __registerScanPackages(IBeanFactory factory) {
        factory.registerPackage(__YMP_BASE_PACKAGE);
        for (String _packageName : __config.getAutoscanPackages()) {
            factory.registerPackage(_packageName);
 }
    }

    /**
     * 初始化YMP框架
     *
     * @return 返回當前YMP核心框架管理器對象
     * @throws Exception 框架初始化失敗時將拋出異常
     */
 public YMP init() throws Exception {
        if (!__inited) {
            //
 _LOG.info(" http://www.ymate.net/");
 //
 StopWatch _watch = new StopWatch();
 _watch.start();
 //
 _LOG.info("Initializing ymate-platform-core-" + VERSION + " - debug:" + __config.isDevelopMode());

 // 初始化I18N
 I18N.initialize(__config.getDefaultLocale(), __config.getI18NEventHandlerClass());
 // 初始化事件管理器，並註冊框架、模塊事件
 __events = Events.create(new DefaultEventConfig(__config.getEventConfigs()));
 __events.registerEvent(ApplicationEvent.class);
 __events.registerEvent(ModuleEvent.class);
 // 創建根對象工廠
 __beanFactory = new DefaultBeanFactory();
 __beanFactory.setLoader(new DefaultBeanLoader(__config.getExcudedFiles()));
 __beanFactory.registerHandler(Bean.class);
 // 創建模塊對象引用集合
 __modules = new HashMap<Class<? extends IModule>, IModule>();
 // 創建模塊對象工廠
 __moduleFactory = new BeanFactory(this);
 __moduleFactory.setLoader(new DefaultBeanLoader(__config.getExcudedFiles()));
 __moduleFactory.registerHandler(Module.class, new ModuleHandler(this));
 __moduleFactory.registerHandler(Proxy.class, new ProxyHandler(this));
 __moduleFactory.registerHandler(EventRegister.class, new EventRegisterHandler(this));
 // 設置自動掃描應用包路徑
 __registerScanPackages(__moduleFactory);
 __registerScanPackages(__beanFactory);
 // 創建代理工廠並初始化
 __proxyFactory = new DefaultProxyFactory(this).registerProxy(new InterceptProxy());
 // 初始化根對象工廠
 __moduleFactory.init();
            for (IModule _module : __modules.values()) {
                if (!_module.isInited()) {
                    _module.init(this);
 // 觸發模塊初始化完成事件
 __events.fireEvent(new ModuleEvent(_module, ModuleEvent.EVENT.MODULE_INITED));
 }
            }
            // 初始化對象工廠
 __beanFactory.init();
 // 初始化對象代理
 __beanFactory.initProxy(__proxyFactory);
 // IoC依賴註入
 __beanFactory.initIoC();
 //
 __inited = true;
 //
 _watch.stop();
 _LOG.info("Initialization completed, Total time: " + _watch.getTime() + "ms");
 // 觸發框架初始化完成事件
 __events.fireEvent(new ApplicationEvent(this, ApplicationEvent.EVENT.APPLICATION_INITED));
 }
        return this;
 }

    /**
     * 銷毀YMP框架
     *
     * @throws Exception 框架銷毀失敗時將拋出異常
     */
 public void destroy() throws Exception {
        if (__inited) {
            // 觸發框架銷毀事件
 __events.fireEvent(new ApplicationEvent(this, ApplicationEvent.EVENT.APPLICATION_DESTROYED));
 //
 __inited = false;
 // 銷毀所有已加載模塊
 for (IModule _module : __modules.values()) {
                // 觸發模塊銷毀事件
 __events.fireEvent(new ModuleEvent(_module, ModuleEvent.EVENT.MODULE_DESTROYED));
 //
 _module.destroy();
 }
            __modules = null;
 // 銷毀代理工廠
 __proxyFactory = null;
 // 銷毀根對象工廠
 __moduleFactory.destroy();
 __moduleFactory = null;
 //
 __beanFactory.destroy();
 __beanFactory = null;
 // 銷毀事件管理器
 __events.destroy();
 }
    }

    /**
     * @return 返回當前配置對象
     */
 public IConfig getConfig() {
        return __config;
 }

    /**
     * @return 返回YMP框架是否已初始化
     */
 public boolean isInited() {
        return __inited;
 }

    /**
     * 註冊自定義註解類處理器，重復註冊將覆蓋前者
     *
     * @param annoClass 自定義註解類型
     * @param handler   註解對象處理器
     */
 public void registerHandler(Class<? extends Annotation> annoClass, IBeanHandler handler) {
        if (annoClass.equals(Module.class) || annoClass.equals(Proxy.class) || annoClass.equals(EventRegister.class)) {
            _LOG.warn("Handler [" + annoClass.getSimpleName() + "] duplicate registration is not allowed");
            return;
 }
        __beanFactory.registerHandler(annoClass, handler);
 }

    public void registerHandler(Class<? extends Annotation> annoClass) {
        registerHandler(annoClass, IBeanHandler.DEFAULT_HANDLER);
 }

    /**
     * 註冊排除的接口類
     *
     * @param excludedClass 預排除的接口類型
     */
 public void registerExcludedClass(Class<?> excludedClass) {
        __beanFactory.registerExcludedClass(excludedClass);
 }

    /**
     * 註冊類
     *
     * @param clazz 目標類
     */
 public void registerBean(Class<?> clazz) {
        __beanFactory.registerBean(clazz);
 }

    public void registerBean(Class<?> clazz, Object object) {
        __beanFactory.registerBean(clazz, object);
 }

    public void registerBean(BeanMeta beanMeta) {
        __beanFactory.registerBean(beanMeta);
 }

    /**
     * @param <T>   返回類型
     * @param clazz 接口類型
     * @return 提取類型為clazz的對象實例
     */
 public <T> T getBean(Class<T> clazz) {
        return __beanFactory.getBean(clazz);
 }

    /**
     * 向工廠註冊代理類對象
     *
     * @param proxy 目標代理類
     */
 public void registerProxy(IProxy proxy) {
        __proxyFactory.registerProxy(proxy);
 }

    public void registerProxy(Collection<? extends IProxy> proxies) {
        __proxyFactory.registerProxy(proxies);
 }

    /**
     * 註冊模塊實例(此方法僅在YMP框架核心管理器未初始化前有效)
     *
     * @param module 目標模塊
     */
 public void registerModule(IModule module) {
        if (!__inited) {
            if (module != null) {
                __moduleFactory.registerBean(module.getClass(), module);
 __modules.put(module.getClass(), module);
 }
        }
    }

    /**
     * @param moduleClass 模塊類型
     * @param <T>         模塊類型
     * @return 獲取模塊類實例對象
     */
 public <T extends IModule> T getModule(Class<T> moduleClass) {
        return __moduleFactory.getBean(moduleClass);
 }

    /**
     * @return 獲取事件管理器
     */
 public Events getEvents() {
        return __events;
 }

    /**
     * @param targetFactory 目標對象工廠
     * @param <T>           對象工廠類型
     * @return 將目標對象工廠的Parent設置為當前YMP容器的對象工廠
     */
 public <T extends IBeanFactory> T bindBeanFactory(T targetFactory) {
        targetFactory.setParent(__beanFactory);
        return targetFactory;
 }

    /**
     * YMP框架根對象工廠類
     */
 private static class BeanFactory extends DefaultBeanFactory {
        private final YMP __owner;

        public BeanFactory(YMP owner) {
            this.__owner = owner;
 }

        @Override
 public <T> T getBean(Class<T> clazz) {
            T _bean = super.getBean(clazz);
 // 重寫此方法是為了在獲取模塊對象時始終保證其已被初始化
 if (_bean instanceof IModule) {
                IModule _module = (IModule) _bean;
                if (!_module.isInited()) {
                    if (__owner.getConfig().getExcludedModules().contains(_module.getName())) {
                        return null;
 }
                    try {
                        _module.init(__owner);
 // 觸發模塊初始化完成事件
 __owner.getEvents().fireEvent(new ModuleEvent(_module, ModuleEvent.EVENT.MODULE_INITED));
 } catch (Exception e) {
                        throw new RuntimeException(RuntimeUtils.unwrapThrow(e));
 }
                }
            }
            return _bean;
 }
    }
}

YMP運行初始化步驟