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/*******************************************************************************
 * Copyright 2012 Anteros Tecnologia
 *  
 * 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 br.com.anteros.bean.validation.messageinterpolation;


import java.util.Collections;
import java.util.HashMap;
import java.util.IllegalFormatException;
import java.util.Iterator;
import java.util.Map;

import br.com.anteros.core.metadata.beans.FeatureDescriptor;
import br.com.anteros.el.api.ELContext;
import br.com.anteros.el.api.ELException;
import br.com.anteros.el.api.ELResolver;
import br.com.anteros.el.api.PropertyNotFoundException;
import br.com.anteros.validation.api.ValidationException;


public class RootResolver extends ELResolver {
	/**
	 * Name under which to bind a formatter to the EL context.
	 */
	public static final String FORMATTER = "formatter";
	private static final String FORMAT = "format";

	private final Map map = Collections.synchronizedMap( new HashMap() );

	@Override
	public Class getCommonPropertyType(ELContext context, Object base) {
		return base == null ? String.class : null;
	}

	@Override
	public Iterator getFeatureDescriptors(ELContext context, Object base) {
		return null;
	}

	@Override
	public Class getType(ELContext context, Object base, Object property) {
		return resolve( context, base, property ) ? Object.class : null;
	}

	@Override
	public Object getValue(ELContext context, Object base, Object property) {
		if ( resolve( context, base, property ) ) {
			if ( !isProperty( (String) property ) ) {
				throw new PropertyNotFoundException( "Cannot find property " + property );
			}
			return getProperty( (String) property );
		}
		return null;
	}

	@Override
	public boolean isReadOnly(ELContext context, Object base, Object property) {
		return false;
	}

	@Override
	public void setValue(ELContext context, Object base, Object property, Object value) {
		if ( resolve( context, base, property ) ) {
			setProperty( (String) property, value );
		}
	}

	@Override
	public Object invoke(ELContext context, Object base, Object method, Class[] paramTypes, Object[] params) {
		if ( resolve( context, base, method ) ) {
			throw new ValidationException( "Invalid property" );
		}

		Object returnValue = null;

		if ( base instanceof FormatterWrapper ) {
			returnValue = evaluateFormatExpression( context, method, params );
		}

		return returnValue;
	}

	private Object evaluateFormatExpression(ELContext context, Object method, Object[] params) {
		if ( !FORMAT.equals( method ) ) {
			throw new ELException( "Wrong method name 'formatter#" + method + "' does not exist. Only formatter#format is supported." );
		}

		if ( params.length == 0 ) {
			throw new ELException( "Invalid number of arguments to Formatter#format" );
		}

		if ( !( params[0] instanceof String ) ) {
			throw new ELException( "The first argument to Formatter#format must be String" );
		}

		FormatterWrapper formatterWrapper = (FormatterWrapper) context.getVariableMapper()
				.resolveVariable( FORMATTER )
				.getValue( context );
		Object[] formattingParameters = new Object[params.length - 1];
		System.arraycopy( params, 1, formattingParameters, 0, params.length - 1 );

		Object returnValue;
		try {
			returnValue = formatterWrapper.format( (String) params[0], formattingParameters );
			context.setPropertyResolved( true );
		}
		catch ( IllegalFormatException e ) {
			throw new ELException( "Error in Formatter#format call", e );
		}

		return returnValue;
	}

	private Object getProperty(String property) {
		return map.get( property );
	}

	private void setProperty(String property, Object value) {
		map.put( property, value );
	}

	private boolean isProperty(String property) {
		return map.containsKey( property );
	}

	private boolean resolve(ELContext context, Object base, Object property) {
		context.setPropertyResolved( base == null && property instanceof String );
		return context.isPropertyResolved();
	}
}