/**
 *
 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either 
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public 
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 * 
 **/
package lucee.runtime.engine;

import java.util.Locale;
import java.util.TimeZone;

import lucee.runtime.PageContext;
import lucee.runtime.PageContextImpl;
import lucee.runtime.config.Config;
import lucee.runtime.config.ConfigImpl;

/**
 * class to handle thread local PageContext, 
 * do use pagecontext in classes that have no method argument pagecontext
 */
public final class ThreadLocalPageContext {

	private static final Locale DEFAULT_LOCALE = Locale.getDefault();
	private static final TimeZone DEFAULT_TIMEZONE = TimeZone.getDefault();
	private static ThreadLocal<PageContext> pcThreadLocal=new ThreadLocal<PageContext>();
	public final static CallOnStart callOnStart=new CallOnStart();

	/**
	 * register a pagecontext for he current thread
	 * @param pc PageContext to register
	 */
	public static void register(PageContext pc) {
		if(pc==null) return; // TODO happens with Gateway, but should not!
		// TODO should i set the old one by "release"?
		Thread t = Thread.currentThread();
		t.setContextClassLoader(((ConfigImpl)pc.getConfig()).getClassLoaderEnv());
		((PageContextImpl)pc).setThread(t);
		pcThreadLocal.set(pc);
	}

	/**
	 * returns pagecontext registered for the current thread
	 * @return pagecontext for the current thread or null 
	 * if no pagecontext is regisred for the current thread
	 */
	public static PageContext get() {//print.dumpStack();
		return pcThreadLocal.get();
	}
	
	public static Config getConfig() {
		PageContext pc = get();
		if(pc!=null) {
			return pc.getConfig();
		}
		return ThreadLocalConfig.get();
		
	}

	/**
	 * release the pagecontext for the current thread
	 */
	public static void release() {
		pcThreadLocal.set(null);
	}

	public static Config getConfig(PageContext pc) {
		if(pc==null)return getConfig();
	    return pc.getConfig();
	}

	public static Config getConfig(Config config) {
		if(config==null)return getConfig();
	    return config;
	}
	
	public static TimeZone getTimeZone(PageContext pc) {
		// pc
		pc = get(pc);
		if(pc!=null){
			if(pc.getTimeZone()!=null)return  pc.getTimeZone();
			return DEFAULT_TIMEZONE;
		}
		
		// config
		Config config = getConfig((Config)null);
		if(config!=null && config.getTimeZone()!=null) {
			return config.getTimeZone();
		}
	    return DEFAULT_TIMEZONE;
	}
	
	public static Locale getLocale(PageContext pc) {
		// pc
		pc = get(pc);
		if(pc!=null){
			if(pc.getLocale()!=null)return  pc.getLocale();
			return DEFAULT_LOCALE;
		}
		
		// config
		Config config = getConfig((Config)null);
		if(config!=null && config.getLocale()!=null) {
			return config.getLocale();
		}
	    return DEFAULT_LOCALE;
	}
	
	public static TimeZone getTimeZone(Config config) {
		PageContext pc = get();
		if(pc!=null && pc.getTimeZone()!=null)
			return  pc.getTimeZone();
			
		config=getConfig(config);
		if(config!=null && config.getTimeZone()!=null) {
			return config.getTimeZone();
		}
	    return DEFAULT_TIMEZONE;
	}
	
	public static TimeZone getTimeZone(TimeZone timezone) {
		if(timezone!=null) return timezone;
	    return getTimeZone((PageContext)null);
	}
	
	public static TimeZone getTimeZone() {
		return getTimeZone((PageContext)null);
	}

	public static PageContext get(PageContext pc) {
		if(pc==null)return get();
	    return pc;
	}
	
	public static PageContext get(Config config) {
		PageContext pc = get();
		if(pc!=null && pc.getConfig()==config) return pc;
		return null;
	}
	
	
	public static class CallOnStart extends ThreadLocal<Boolean> {

		@Override
		protected Boolean initialValue() {
			return Boolean.TRUE;
		}
		
	}
	
}