// Copyright (C) 2015 The Android Open Source Project
//
// Licensed 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 com.googlesource.gerrit.plugins.github.replication;

import java.io.IOException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.gerrit.common.EventListener;
import com.google.gerrit.reviewdb.client.Project.NameKey;
import com.google.gerrit.server.OutputFormat;
import com.google.gerrit.server.events.Event;
import com.google.gerrit.server.events.RefEvent;
import com.google.gson.Gson;
import com.google.gson.JsonObject;
import com.google.inject.Inject;
import com.google.inject.Singleton;

@Singleton
public class ReplicationErrorListener implements EventListener {
  private static final String REF_REPLICATED_EVENT = "ref-replicated";
  private static Logger log = LoggerFactory
      .getLogger(ReplicationErrorListener.class);

  private final ReplicationStatusStore statusStore;
  private final Gson gson;

  @Inject
  public ReplicationErrorListener(ReplicationStatusStore statusStore) {
    this.statusStore = statusStore;
    this.gson = OutputFormat.JSON_COMPACT.newGson();
  }

  @Override
  public void onEvent(Event event) {
    if (RefEvent.class.isAssignableFrom(event.getClass())
        && event.getType().equals(REF_REPLICATED_EVENT)) {
      RefEvent refEvent = (RefEvent) event;
      NameKey projectNameKey = refEvent.getProjectNameKey();
      JsonObject eventJson = (JsonObject) gson.toJsonTree(event);
      String projectKey =
          projectNameKey.get() + "/" + eventJson.get("ref").getAsString();

      try {
        if (eventJson.get("status").getAsString().equals("succeeded")) {
          statusStore.remove(projectKey);
        } else {
          statusStore.set(projectKey, eventJson);
        }
      } catch (IOException e) {
        log.error("Unable to update replication status for event " + eventJson
            + " on project " + projectKey, e);
      }
    }
  }
}