// Copyright (C) 2016 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.google.gerrit.acceptance.server.event;

import static com.google.common.truth.Truth.assertThat;
import static com.google.gerrit.server.group.SystemGroupBackend.ANONYMOUS_USERS;
import static com.google.gerrit.server.project.Util.category;
import static com.google.gerrit.server.project.Util.value;
import static org.junit.Assert.fail;

import com.google.gerrit.acceptance.AbstractDaemonTest;
import com.google.gerrit.acceptance.NoHttpd;
import com.google.gerrit.acceptance.PushOneCommit;
import com.google.gerrit.common.UserScopedEventListener;
import com.google.gerrit.common.data.LabelType;
import com.google.gerrit.common.data.Permission;
import com.google.gerrit.extensions.api.changes.ReviewInput;
import com.google.gerrit.extensions.common.ChangeInfo;
import com.google.gerrit.extensions.common.LabelInfo;
import com.google.gerrit.extensions.registration.DynamicSet;
import com.google.gerrit.extensions.registration.RegistrationHandle;
import com.google.gerrit.reviewdb.client.AccountGroup;
import com.google.gerrit.server.CurrentUser;
import com.google.gerrit.server.IdentifiedUser;
import com.google.gerrit.server.data.ApprovalAttribute;
import com.google.gerrit.server.events.CommentAddedEvent;
import com.google.gerrit.server.events.Event;
import com.google.gerrit.server.git.ProjectConfig;
import com.google.gerrit.server.group.SystemGroupBackend;
import com.google.gerrit.server.project.Util;
import com.google.inject.Inject;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;

@NoHttpd
public class CommentAddedEventIT extends AbstractDaemonTest {

  @Inject
  private IdentifiedUser.GenericFactory factory;

  @Inject
  private DynamicSet<UserScopedEventListener> source;

  private final LabelType label = category("CustomLabel",
      value(1, "Positive"),
      value(0, "No score"),
      value(-1, "Negative"));

  private final LabelType pLabel = category("CustomLabel2",
      value(1, "Positive"),
      value(0, "No score"));

  private RegistrationHandle eventListenerRegistration;
  private CommentAddedEvent lastCommentAddedEvent;

  @Before
  public void setUp() throws Exception {
    ProjectConfig cfg = projectCache.checkedGet(project).getConfig();
    AccountGroup.UUID anonymousUsers =
        SystemGroupBackend.getGroup(ANONYMOUS_USERS).getUUID();
    Util.allow(cfg, Permission.forLabel(label.getName()), -1, 1, anonymousUsers,
        "refs/heads/*");
    Util.allow(cfg, Permission.forLabel(pLabel.getName()), 0, 1, anonymousUsers,
        "refs/heads/*");
    saveProjectConfig(project, cfg);

    eventListenerRegistration = source.add(new UserScopedEventListener() {
      @Override
      public void onEvent(Event event) {
        if (event instanceof CommentAddedEvent) {
          lastCommentAddedEvent = (CommentAddedEvent) event;
        }
      }

      @Override
      public CurrentUser getUser() {
        return factory.create(user.id);
      }
    });
  }

  @After
  public void cleanup() {
    eventListenerRegistration.remove();
  }

  private void saveLabelConfig() throws Exception {
    ProjectConfig cfg = projectCache.checkedGet(project).getConfig();
    cfg.getLabelSections().put(label.getName(), label);
    cfg.getLabelSections().put(pLabel.getName(), pLabel);
    saveProjectConfig(project, cfg);
  }

  @Test
  public void newChangeWithVote() throws Exception {
    saveLabelConfig();

    // push a new change with -1 vote
    PushOneCommit.Result r = createChange();
    ReviewInput reviewInput = new ReviewInput().label(
        label.getName(), (short)-1);
    revision(r).review(reviewInput);
    String newVote = lastCommentAddedEvent.approvals.get()[0].value;
    String oldVote = lastCommentAddedEvent.approvals.get()[0].oldValue;
    assertThat(oldVote).isEqualTo("0");
    assertThat(newVote).isEqualTo("-1");
    assertThat(lastCommentAddedEvent.comment).isEqualTo(
        String.format("Patch Set 1: %s-1", label.getName()));
  }

  @Test
  public void newPatchSetWithVote() throws Exception {
    saveLabelConfig();

    // push a new change
    PushOneCommit.Result r = createChange();
    ReviewInput reviewInput = new ReviewInput().message(label.getName());
    revision(r).review(reviewInput);

    // push a new revision with +1 vote
    ChangeInfo c = get(r.getChangeId());
    r = amendChange(c.changeId);
    reviewInput = new ReviewInput().label(
        label.getName(), (short)1);
    revision(r).review(reviewInput);
    String newVote = lastCommentAddedEvent.approvals.get()[0].value;
    String oldVote = lastCommentAddedEvent.approvals.get()[0].oldValue;
    assertThat(oldVote).isEqualTo("0");
    assertThat(newVote).isEqualTo("1");
    assertThat(lastCommentAddedEvent.comment).isEqualTo(
        String.format("Patch Set 2: %s+1", label.getName()));
  }

  @Test
  public void reviewChange() throws Exception {
    saveLabelConfig();

    // push a change
    PushOneCommit.Result r = createChange();

    // review with message only, do not apply votes
    ReviewInput reviewInput = new ReviewInput().message(label.getName());
    revision(r).review(reviewInput);
    // reply message only so votes are excluded from comment
    assertThat(lastCommentAddedEvent.approvals.get()).isNull();
    assertThat(lastCommentAddedEvent.comment).isEqualTo(
        String.format("Patch Set 1:\n\n%s", label.getName()));

    // transition from un-voted to -1 vote
    reviewInput = new ReviewInput().label(label.getName(), -1);
    revision(r).review(reviewInput);
    String newVote = lastCommentAddedEvent.approvals.get()[0].value;
    String oldVote = lastCommentAddedEvent.approvals.get()[0].oldValue;
    assertThat(oldVote).isEqualTo("0");
    assertThat(newVote).isEqualTo("-1");
    assertThat(lastCommentAddedEvent.comment).isEqualTo(
        String.format("Patch Set 1: %s-1", label.getName()));

    // transition vote from -1 to 0
    reviewInput = new ReviewInput().label(label.getName(), 0);
    revision(r).review(reviewInput);
    newVote = lastCommentAddedEvent.approvals.get()[0].value;
    oldVote = lastCommentAddedEvent.approvals.get()[0].oldValue;
    assertThat(oldVote).isEqualTo("-1");
    assertThat(newVote).isEqualTo("0");
    assertThat(lastCommentAddedEvent.comment).isEqualTo(
        String.format("Patch Set 1: -%s", label.getName()));

    // transition vote from 0 to 1
    reviewInput = new ReviewInput().label(label.getName(), 1);
    revision(r).review(reviewInput);
    newVote = lastCommentAddedEvent.approvals.get()[0].value;
    oldVote = lastCommentAddedEvent.approvals.get()[0].oldValue;
    assertThat(oldVote).isEqualTo("0");
    assertThat(newVote).isEqualTo("1");
    assertThat(lastCommentAddedEvent.comment).isEqualTo(
        String.format("Patch Set 1: %s+1", label.getName()));

    // transition vote from 1 to -1
    reviewInput = new ReviewInput().label(label.getName(), -1);
    revision(r).review(reviewInput);
    newVote = lastCommentAddedEvent.approvals.get()[0].value;
    oldVote = lastCommentAddedEvent.approvals.get()[0].oldValue;
    assertThat(oldVote).isEqualTo("1");
    assertThat(newVote).isEqualTo("-1");
    assertThat(lastCommentAddedEvent.comment).isEqualTo(
        String.format("Patch Set 1: %s-1", label.getName()));

    // review with message only, do not apply votes
    reviewInput = new ReviewInput().message(label.getName());
    revision(r).review(reviewInput);
    newVote = lastCommentAddedEvent.approvals.get()[0].value;
    oldVote = lastCommentAddedEvent.approvals.get()[0].oldValue;
    assertThat(oldVote).isEqualTo(null);  // no vote change so not included
    assertThat(newVote).isEqualTo("-1");
    assertThat(lastCommentAddedEvent.comment).isEqualTo(
        String.format("Patch Set 1:\n\n%s", label.getName()));
  }

  @Test
  public void reviewChange_MultipleVotes() throws Exception {
    saveLabelConfig();
    PushOneCommit.Result r = createChange();
    ReviewInput reviewInput = new ReviewInput().label(label.getName(), -1);
    reviewInput.message = label.getName();
    revision(r).review(reviewInput);

    ChangeInfo c = get(r.getChangeId());
    LabelInfo q = c.labels.get(label.getName());
    assertThat(q.all).hasSize(1);
    assertThat(lastCommentAddedEvent.comment).isEqualTo(
        String.format("Patch Set 1: %s-1\n\n%s",
            label.getName(), label.getName()));

    reviewInput = new ReviewInput().label(pLabel.getName(), 1);
    reviewInput.message = pLabel.getName();
    revision(r).review(reviewInput);

    c = get(r.getChangeId());
    q = c.labels.get(label.getName());
    assertThat(q.all).hasSize(1);
    assertThat(lastCommentAddedEvent.comment).isEqualTo(
        String.format("Patch Set 1: %s+1\n\n%s",
            pLabel.getName(), pLabel.getName()));

    assertThat(lastCommentAddedEvent.approvals.get()).hasLength(2);
    for (ApprovalAttribute approval : lastCommentAddedEvent.approvals.get()) {
      if (approval.type.equals(label.getName())) {
        assertThat(approval.value).isEqualTo("-1");
        assertThat(approval.oldValue).isNull();
      } else if (approval.type.equals(pLabel.getName())) {
        assertThat(approval.value).isEqualTo("1");
        assertThat(approval.oldValue).isEqualTo("0");
      } else {
        fail("Unexpected label: " + approval.type);
      }
    }
  }
}