// Copyright (C) 2017 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.its.phabricator;

import com.google.common.flogger.FluentLogger;
import com.google.gerrit.extensions.annotations.PluginName;
import com.google.gerrit.server.config.GerritServerConfig;
import com.google.inject.Inject;
import com.googlesource.gerrit.plugins.its.base.its.ItsFacade;
import com.googlesource.gerrit.plugins.its.phabricator.conduit.Conduit;
import com.googlesource.gerrit.plugins.its.phabricator.conduit.ConduitException;
import java.io.IOException;
import java.net.URL;
import org.eclipse.jgit.lib.Config;

public class PhabricatorItsFacade implements ItsFacade {
  private static final FluentLogger logger = FluentLogger.forEnclosingClass();

  private static final String GERRIT_CONFIG_URL = "url";
  private static final String GERRIT_CONFIG_TOKEN = "token";

  private final Conduit conduit;

  @Inject
  public PhabricatorItsFacade(
      @PluginName String pluginName,
      @GerritServerConfig Config cfg,
      Conduit.Factory conduitFactory) {
    String url = cfg.getString(pluginName, null, GERRIT_CONFIG_URL);
    String token = cfg.getString(pluginName, null, GERRIT_CONFIG_TOKEN);

    this.conduit = conduitFactory.create(url, token);
  }

  @Override
  public void addComment(final String bugId, final String comment) throws IOException {
    int task_id = Integer.parseInt(bugId);
    try {
      conduit.maniphestEdit(task_id, comment, null, null);
    } catch (ConduitException e) {
      throw new IOException("Could not add comment for task " + task_id, e);
    }
    logger.atFine().log("Added comment %s to bug %s", comment, task_id);
  }

  @Override
  public void addRelatedLink(final String issueKey, final URL relatedUrl, String description)
      throws IOException {
    addComment(
        issueKey, "Related URL: " + createLinkForWebui(relatedUrl.toExternalForm(), description));
  }

  @Override
  public boolean exists(final String bugId) throws IOException {
    Boolean ret = false;
    int task_id = Integer.parseInt(bugId);
    try {
      ret = (conduit.maniphestSearch(task_id) != null);
    } catch (ConduitException e) {
      throw new IOException("Could not check existence of task " + task_id, e);
    }
    return ret;
  }

  @Override
  public void performAction(final String taskIdString, final String actionString)
      throws IOException {
    int taskId = Integer.parseInt(taskIdString);
    String chopped[] = actionString.split(" ");
    if (chopped.length >= 1) {
      String action = chopped[0];
      try {
        switch (action) {
          case "add-project":
            assertParameters(action, chopped, 1);
            conduit.maniphestEdit(taskId, null, chopped[1], null);
            break;
          case "remove-project":
            assertParameters(action, chopped, 1);
            conduit.maniphestEdit(taskId, null, null, chopped[1]);
            break;
          default:
            throw new IOException("Unknown action " + action);
        }
      } catch (ConduitException e) {
        throw new IOException("Could not perform action " + action, e);
      }
    } else {
      throw new IOException("Could not parse action " + actionString);
    }
  }

  private void assertParameters(String action, String[] params, int length) throws IOException {
    if (params.length - 1 != length) {
      throw new IOException(
          String.format(
              "Action %s expects exactly %d parameter(s) but %d given",
              action, length, params.length - 1));
    }
  }

  @Override
  public String healthCheck(final Check check) throws IOException {
    // This method is not used, so there is no need to implement it.
    return "unknown";
  }

  @Override
  public String createLinkForWebui(String url, String text) {
    String ret = "[[" + url;
    if (text != null && !text.isEmpty() && !text.equals(url)) {
      ret += "|" + text;
    }
    ret += "]]";
    return ret;
  }
}