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/**
 * Copyright (C) 2011 Angelo Zerr  and Pascal Leclercq 
 *
 * All rights reserved.
 *
 * Permission is hereby granted, free  of charge, to any person obtaining
 * a  copy  of this  software  and  associated  documentation files  (the
 * "Software"), to  deal in  the Software without  restriction, including
 * without limitation  the rights to  use, copy, modify,  merge, publish,
 * distribute,  sublicense, and/or sell  copies of  the Software,  and to
 * permit persons to whom the Software  is furnished to do so, subject to
 * the following conditions:
 *
 * The  above  copyright  notice  and  this permission  notice  shall  be
 * included in all copies or substantial portions of the Software.
 *
 * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
 * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
 * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package fr.opensagres.xdocreport.converter;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;

import fr.opensagres.xdocreport.converter.discovery.IConverterDiscovery;
import fr.opensagres.xdocreport.core.logging.LogUtils;
import fr.opensagres.xdocreport.core.registry.AbstractRegistry;

/**
 * {@link IConverter} registry.
 * 
 */
public class ConverterRegistry extends AbstractRegistry {

	private static final ConverterRegistry INSTANCE = new ConverterRegistry();

	/**
	 * Logger for this class
	 */
	private static final Logger LOGGER = LogUtils.getLogger(AbstractRegistry.class.getName());

	private Map converters = new HashMap();

	public ConverterRegistry() {

		super(IConverterDiscovery.class);

	}

	public static ConverterRegistry getRegistry() {
		return INSTANCE;
	}

	public IConverter findConverter(Options options) throws XDocConverterException {
		return findConverter(options.getFrom(), options.getTo(), options.getVia());
	}

	public IConverter findConverter(String from, String to, String via) throws XDocConverterException {
		return internalFindConverter(from, to, via, true);
	}

	public IConverter getConverter(Options options) {
		return getConverter(options.getFrom(), options.getTo(), options.getVia());
	}

	public IConverter getConverter(String from, String to, String via) {
		try {
			return internalFindConverter(from, to, via, false);
		} catch (XDocConverterException e) {
			if (LOGGER.isLoggable(Level.FINE)) {
				LOGGER.fine(e.getMessage());
			}
			return null;
		}
	}

	public ConverterFrom getConverterFrom(String from) {
		initializeIfNeeded();
		return converters.get(from);
	}

	public Set getFroms() {
		initializeIfNeeded();
		return converters.keySet();
	}

	private IConverter internalFindConverter(String from, String to, String via, boolean throwError) throws XDocConverterException {
		initializeIfNeeded();
		ConverterFrom fromConverters = getConverterFrom(from);
		if (fromConverters == null) {
			String msg = String.format("Cannot find converters from=%s", from);
			LOGGER.severe(msg);
			if(throwError){
				throw new XDocConverterException(msg);	
			}
			return null;
		}
		ConverterTo toConverters = fromConverters.getConverterTo(to);
		if (toConverters == null) {
			String msg = String.format("Cannot find converters for to=%s for from=%s", to, from);
			LOGGER.severe(msg);
			if(throwError){
				throw new XDocConverterException(msg);	
			}
			return null;
		}
		if (via == null) {
			IConverter converter = toConverters.getFirstConverter();
			if (throwError && converter == null) {
				String msg = String.format("Cannot find converters for to=%s for from=%s", to, from);
				LOGGER.severe(msg);
				if(throwError){
					throw new XDocConverterException(msg);	
				}
			}
			return converter;
		}

		IConverter converter = toConverters.getConverter(via);
		if (converter == null) {
			String msg = String.format("Cannot find converters via %s for to=%s for from=%s", via, to, from);
			LOGGER.severe(msg);
			if(throwError){
				throw new XDocConverterException(msg);	
			}
		}
		return converter;
	}

	@Override
	protected void doDispose() {
		this.converters.clear();
	}

	@Override
	protected boolean registerInstance(IConverterDiscovery discovery) {
		String from = discovery.getFrom();
		String to = discovery.getTo();
		String via = discovery.getVia();
		IConverter converter = discovery.getConverter();
		ConverterFrom converterFrom = converters.get(from);
		if (converterFrom == null) {
			converterFrom = new ConverterFrom(from);
			converters.put(converterFrom.getFrom(), converterFrom);
		}
		converterFrom.addConverter(to, via, converter);
		return true;
	}
}