/**
 * Copyright (C) 2010-2017 Structr GmbH
 *
 * This file is part of Structr <http://structr.org>.
 *
 * Structr is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * Structr 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Structr.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.structr.core.function;

import org.apache.commons.lang3.StringUtils;
import org.structr.common.error.FrameworkException;
import org.structr.schema.action.ActionContext;
import org.structr.schema.action.Function;

/**
 *
 */
public class AbbrFunction extends Function<Object, Object> {

	public static final String ERROR_MESSAGE_ABBR = "Usage: ${abbr(longString, maxLength)}. Example: ${abbr(this.title, 20)}";

	@Override
	public String getName() {
		return "abbr()";
	}

	@Override
	public Object apply(final ActionContext ctx, final Object caller, final Object[] sources) throws FrameworkException {

		try {
			
			if (sources == null || sources.length != 2 || sources[1] == null) {
	
				logParameterError(caller, sources, ctx.isJavaScriptContext());
				return usage(ctx.isJavaScriptContext());
			}			

			if (sources[0] == null) {
				
				return "";
			}
			
			int maxLength = Double.valueOf(sources[1].toString()).intValue();

			if (sources[0].toString().length() > maxLength) {

				return StringUtils.substringBeforeLast(StringUtils.substring(sources[0].toString(), 0, maxLength), " ").concat("…");

			} else {

				return sources[0];
			}

		} catch (final NumberFormatException nfe) {

			logException(nfe, "{}: NumberFormatException in \"{}\". Can not parse \"{}\" as Integer. Returning original string. Parameters: {}", new Object[] { getName(), caller, sources[1], getParametersAsString(sources) });

			return sources[0];

		} catch (final IllegalArgumentException e) {

			logParameterError(caller, sources, ctx.isJavaScriptContext());

			return usage(ctx.isJavaScriptContext());
		}

	}


	@Override
	public String usage(boolean inJavaScriptContext) {
		return ERROR_MESSAGE_ABBR;
	}

	@Override
	public String shortDescription() {
		return "Abbreviates the given string";
	}

}