/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.jooby.internal.sitemap;

import java.util.List;
import java.util.Set;
import java.util.function.Predicate;
import java.util.stream.Collectors;

import org.jooby.MediaType;
import org.jooby.Request;
import org.jooby.Results;
import org.jooby.Route;
import org.jooby.sitemap.WebPageProvider;

import cz.jiripinkas.jsitemapgenerator.WebPage;
import javaslang.Function1;

class SitemapHandler implements Route.OneArgHandler {

  private String name;

  private Predicate<Route.Definition> filter;

  private Function1<List<WebPage>, String> gen;

  public SitemapHandler(final String name, final Predicate<Route.Definition> filter,
      final Function1<List<WebPage>, String> gen) {
    this.name = name;
    this.filter = filter;
    this.gen = gen;
  }

  @Override
  public Object handle(final Request req) throws Throwable {
    Set<Route.Definition> routes = req.require(Route.KEY);
    WebPageProvider provider = req.require(name, WebPageProvider.class);
    List<WebPage> pages = routes.stream()
        .filter(filter)
        .flatMap(r -> provider.apply(r).stream())
        .map(page -> {
          String name = page.getName();
          if (name.startsWith("/")) {
            name = name.substring(1);
          }
          page.setName(name);
          return page;
        }).collect(Collectors.toList());
    return Results.ok(gen.apply(pages)).type(MediaType.xml);
  }

}
