/**
 * Copyright (C) 2011 BonitaSoft S.A.
 * BonitaSoft, 32 rue Gustave Eiffel - 38000 Grenoble
 * This program 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 2.0 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
package org.bonitasoft.web.toolkit.client.common.texttemplate;

import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import com.google.gwt.regexp.shared.MatchResult;
import com.google.gwt.regexp.shared.RegExp;

/**
 * Text template using %...% syntax <br />
 * The passed parameters will replace %parameter_name% by parameterValue.
 * 
 * @author Séverin Moussel
 */
public class TextTemplate {

    private String template = null;

    private List<String> expectedParameters = null;

    public TextTemplate(final String template) {
        this.template = template;
    }

    public String toString(final Map<String, String> data) {
        String result = this.template;

        for (final Entry<String, String> entry : data.entrySet()) {
            result = result.replaceAll("%" + entry.getKey() + "%", entry.getValue() != null ? entry.getValue() : "");
        }

        return result;
    }

    public String toString(final Arg... parameters) {
        String result = this.template;
        for (final Arg parameter : parameters) {
            result = result.replaceAll("%" + parameter.getName() + "%", parameter.getValue());
        }
        return result;
    }

    public String toString(final List<Arg> parameters) {
        String result = this.template;
        for (final Arg parameter : parameters) {
            result = result.replaceAll("%" + parameter.getName() + "%", parameter.getValue());
        }
        return result;
    }

    @Override
    public String toString() {
        return this.template;
    }

    /**
     * Read the template to get the excepted parameters.<br />
     * Expected parameters are the strings between %...%
     */
    public List<String> getExpectedParameters() {
        // Cache result
        if (this.expectedParameters == null) {
            parseExpectedParameters();
        }

        return this.expectedParameters;

    }

    /**
     * Read the template to get the excepted parameters and store the result in the class variable "expectedParameters"
     */
    private void parseExpectedParameters() {
        this.expectedParameters = new LinkedList<String>();

        final RegExp regExp = RegExp.compile("%(.*?)%", "g");
        MatchResult matcher = null;

        while ((matcher = regExp.exec(this.template)) != null) {
            this.expectedParameters.add(matcher.getGroup(1));
        }
    }

}