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/* --------------------------------------------------------------------
 *  Inugami  
 * --------------------------------------------------------------------
 * 
 * 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, version 3.
 *
 * 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 .
 */
package io.inugami.commons.files;

import java.io.File;
import java.io.IOException;
import java.util.Map;

/**
 * TemplateRendering
 * 
 * @author patrick_guillerm
 * @since 23 juin 2017
 */
public class TemplateRendering {
    
    // =========================================================================
    // render
    // =========================================================================
    public String render(final File template, final Map properties) throws IOException {
        FilesUtils.assertIsFile(template);
        FilesUtils.assertCanRead(template);
        
        String content = "";
        final byte[] data = FilesUtils.readBytes(template);
        
        if (data != null) {
            content = new String(data);
        }
        
        if (!properties.isEmpty()) {
            for (final Map.Entry entry : properties.entrySet()) {
                content = applyProperty(content, entry.getKey(), entry.getValue());
            }
        }
        return content;
    }
    
    // =========================================================================
    // applyProperty
    // =========================================================================
    public String applyProperty(final String content, final String key, final String value) {
        //@formatter:off
        final String regex = new StringBuilder()
                                    .append("[$][{]")
                                    .append(key)
                                    .append("[}]")
                                    .toString();
        //@formatter:on
        
        return content.replaceAll(regex, value);
    }
    
}