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/*
 * 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.apache.shindig.sample.container;

import org.apache.shindig.common.uri.Uri;
import org.apache.shindig.protocol.Operation;
import org.apache.shindig.protocol.ProtocolException;
import org.apache.shindig.protocol.RequestItem;
import org.apache.shindig.protocol.Service;
import org.apache.shindig.social.sample.spi.JsonDbOpensocialService;
import org.json.JSONException;
import org.json.JSONObject;
import org.apache.shindig.gadgets.GadgetException;
import org.apache.shindig.gadgets.http.HttpFetcher;
import org.apache.shindig.gadgets.http.HttpRequest;
import org.apache.shindig.gadgets.http.HttpResponse;


import java.util.concurrent.Future;
import java.util.Map;

import javax.servlet.http.HttpServletResponse;

import com.google.common.util.concurrent.Futures;
import com.google.inject.Inject;

@Service(name = "samplecontainer", path = "/{type}/{doevil}")
public class SampleContainerHandler {

  private final JsonDbOpensocialService service;
  private final HttpFetcher fetcher;
  @Inject
  public SampleContainerHandler(JsonDbOpensocialService dbService, HttpFetcher fetcher) {
    this.service = dbService;
    this.fetcher = fetcher;
  }

  /**
   * We don't distinguish between put and post for these urls.
   */
  @Operation(httpMethods = "PUT")
  public Future update(RequestItem request) throws ProtocolException {
    return create(request);
  }

  /**
   * Handles /samplecontainer/setstate and /samplecontainer/setevilness/{doevil}. TODO(doll): These
   * urls aren't very resty. Consider changing the samplecontainer.html calls post.
   */
  @Operation(httpMethods = "POST", bodyParam = "data")
  public Future create(RequestItem request) throws ProtocolException {
    String type = request.getParameter("type");
    if ("setstate".equals(type)) {
      try {
        @SuppressWarnings("unchecked")
        Map bodyparams = request.getTypedParameter("data", Map.class);
        String stateFile = bodyparams.get("fileurl");
        service.setDb(new JSONObject(fetchStateDocument(stateFile)));
      } catch (JSONException e) {
        throw new ProtocolException(HttpServletResponse.SC_BAD_REQUEST,
            "The json state file was not valid json", e);
      }
    } else if ("setevilness".equals(type)) {
      throw new ProtocolException(HttpServletResponse.SC_NOT_IMPLEMENTED,
          "evil data has not been implemented yet");
    }

    return Futures.immediateFuture(null);
  }

  /**
   * Handles /samplecontainer/dumpstate
   */
  @Operation(httpMethods = "GET")
  public Future get(RequestItem request) {
    return Futures.immediateFuture(service.getDb());
  }

  private String fetchStateDocument(String stateFileLocation) {
    String errorMessage = "The json state file " + stateFileLocation
        + " could not be fetched and parsed.";

    try {
      HttpResponse response = fetcher.fetch(new HttpRequest(Uri.parse(stateFileLocation)));
      if (response.getHttpStatusCode() != 200) {
        throw new RuntimeException(errorMessage);
      }
      return response.getResponseAsString();
    } catch (GadgetException e) {
      throw new RuntimeException(errorMessage, e);
    }
  }
}