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/*******************************************************************************
 * Copyright (C) 2011  John Casey
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program 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 Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public
 * License along with this program.  If not, see 
 * .
 ******************************************************************************/
package org.commonjava.web.config;

import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

import org.commonjava.web.config.section.ConfigurationSectionListener;

public class DefaultConfigurationRegistry
    implements ConfigurationRegistry
{
    private Collection listeners;

    private Map> sectionMap;

    public DefaultConfigurationRegistry()
    {
    }

    public DefaultConfigurationRegistry( final Class... types )
        throws ConfigurationException
    {
        this( new DefaultConfigurationListener( types ) );
    }

    public DefaultConfigurationRegistry( final ConfigurationSectionListener... sectionListeners )
        throws ConfigurationException
    {
        this( new DefaultConfigurationListener( sectionListeners ) );
    }

    public DefaultConfigurationRegistry( final ConfigurationListener... listeners )
        throws ConfigurationException
    {
        this.listeners = Arrays.asList( listeners );
        mapSectionListeners();
    }

    public DefaultConfigurationRegistry( final Object[] data )
        throws ConfigurationException
    {
        for ( final Object d : data )
        {
            if ( d instanceof ConfigurationListener )
            {
                with( (ConfigurationListener) d );
            }
            else if ( d instanceof ConfigurationSectionListener )
            {
                with( (ConfigurationSectionListener) d );
            }
            else if ( d instanceof Class )
            {
                with( (Class) d );
            }
            else
            {
                throw new ConfigurationException( "Invalid input for configuration registry: %s", d );
            }
        }
    }

    public DefaultConfigurationRegistry with( final ConfigurationListener listener )
        throws ConfigurationException
    {
        mapListener( listener );
        return this;
    }

    public DefaultConfigurationRegistry with( final ConfigurationSectionListener listener )
        throws ConfigurationException
    {
        mapListener( new DefaultConfigurationListener( listener ) );
        return this;
    }

    public DefaultConfigurationRegistry with( final Class type )
        throws ConfigurationException
    {
        mapListener( new DefaultConfigurationListener( type ) );
        return this;
    }

    @Override
    public void configurationParsed()
        throws ConfigurationException
    {
        if ( listeners != null )
        {
            for ( final ConfigurationListener listener : listeners )
            {
                listener.configurationComplete();
            }
        }
        else
        {
            // TODO: Log to debug level!
        }
    }

    @Override
    public boolean sectionStarted( final String name )
        throws ConfigurationException
    {
        final ConfigurationSectionListener listener = sectionMap.get( name );
        if ( listener != null )
        {
            listener.sectionStarted( name );
            return true;
        }

        return false;
    }

    @Override
    public void sectionComplete( final String name )
        throws ConfigurationException
    {
        final ConfigurationSectionListener listener = sectionMap.get( name );
        if ( listener != null )
        {
            listener.sectionComplete( name );
        }
    }

    @Override
    public void parameter( final String section, final String name, final String value )
        throws ConfigurationException
    {
        final ConfigurationSectionListener secListener = sectionMap.get( section );
        secListener.parameter( name, value );
    }

    protected synchronized void mapSectionListeners()
        throws ConfigurationException
    {
        if ( listeners != null )
        {
            for ( final ConfigurationListener listener : listeners )
            {
                mapListener( listener );
            }
        }
        else
        {
            // TODO: Log to debug level!
        }
    }

    private void mapListener( final ConfigurationListener listener )
        throws ConfigurationException
    {
        if ( sectionMap == null )
        {
            sectionMap = new HashMap>();
        }

        final Map> parsers = listener.getSectionListeners();
        for ( final Map.Entry> entry : parsers.entrySet() )
        {
            final String section = entry.getKey();
            if ( sectionMap.containsKey( section ) )
            {
                throw new ConfigurationException(
                                                  "Section collision! More than one ConfigurationParser bound to section: %s\n\t%s\n\t%s",
                                                  section, sectionMap.get( section ), entry.getValue() );
            }

            sectionMap.put( section, entry.getValue() );
        }
    }

}