/*
 * Copyright 2014 Red Hat, Inc.
 *
 *  All rights reserved. This program and the accompanying materials
 *  are made available under the terms of the Eclipse Public License v1.0
 *  and Apache License v2.0 which accompanies this distribution.
 *
 *  The Eclipse Public License is available at
 *  http://www.eclipse.org/legal/epl-v10.html
 *
 *  The Apache License v2.0 is available at
 *  http://www.opensource.org/licenses/apache2.0.php
 *
 *  You may elect to redistribute this code under either of these licenses.
 */

package io.vertx.ext.web.templ.rocker.impl;

import com.fizzed.rocker.Rocker;
import io.vertx.core.AsyncResult;
import io.vertx.core.Future;
import io.vertx.core.Handler;
import io.vertx.core.buffer.Buffer;
import io.vertx.ext.web.templ.rocker.RockerTemplateEngine;

import java.util.Map;

/**
 * @author <a href="mailto:xianguang.zhou@outlook.com">Xianguang Zhou</a>
 */
public class RockerTemplateEngineImpl implements RockerTemplateEngine {

  private final String extension;

  public RockerTemplateEngineImpl(String extension) {
    this.extension = extension.charAt(0) == '.' ? extension : "." + extension;
  }

  @Override
  public void render(Map<String, Object> context, String templateFile, Handler<AsyncResult<Buffer>> handler) {
    try {
      handler.handle(Future.succeededFuture(
        Rocker.template(adjustLocation(templateFile))
          .relaxedBind(context)
          .render(VertxBufferOutput.FACTORY)
          .getBuffer()));
    } catch (final RuntimeException ex) {
      handler.handle(Future.failedFuture(ex));
    }
  }

  @Override
  public void clearCache() {
    // No-Op
  }

  private String adjustLocation(String location) {
    if (extension != null) {
      if (!location.endsWith(extension)) {
        location += extension;
      }
    }
    return location;
  }
}
