// Copyright (C) 2013 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.rest.change;

import static com.google.common.truth.Truth.assertThat;

import com.google.gerrit.acceptance.PushOneCommit;
import com.google.gerrit.extensions.client.SubmitType;
import com.google.gerrit.extensions.common.ActionInfo;
import com.google.gerrit.reviewdb.client.Change;
import com.google.gerrit.server.data.RefUpdateAttribute;

import org.eclipse.jgit.revwalk.RevCommit;
import org.junit.Test;

import java.util.Map;

public class SubmitByFastForwardIT extends AbstractSubmit {

  @Override
  protected SubmitType getSubmitType() {
    return SubmitType.FAST_FORWARD_ONLY;
  }

  @Test
  public void submitWithFastForward() throws Exception {
    RevCommit oldHead = getRemoteHead();
    PushOneCommit.Result change = createChange();
    submit(change.getChangeId());
    RevCommit head = getRemoteHead();
    assertThat(head.getId()).isEqualTo(change.getCommitId());
    assertThat(head.getParent(0)).isEqualTo(oldHead);
    assertSubmitter(change.getChangeId(), 1);
  }

  @Test
  public void submitTwoChangesWithFastForward() throws Exception {
    RevCommit originalHead = getRemoteHead();

    PushOneCommit.Result change = createChange();
    PushOneCommit.Result change2 = createChange();

    String id1 = change.getChangeId();
    String id2 = change2.getChangeId();
    approve(id1);
    submit(id2);

    RevCommit updatedHead = getRemoteHead();
    assertThat(updatedHead.getId()).isEqualTo(change2.getCommit());
    assertThat(updatedHead.getParent(0).getId()).isEqualTo(change.getCommit());
    assertSubmitter(change.getChangeId(), 1);
    assertSubmitter(change2.getChangeId(), 1);
    assertPersonEquals(admin.getIdent(), updatedHead.getAuthorIdent());
    assertPersonEquals(admin.getIdent(), updatedHead.getCommitterIdent());
    assertSubmittedTogether(id1, id2, id1);
    assertSubmittedTogether(id2, id2, id1);

    RefUpdateAttribute refUpdate = getOneRefUpdate(
        project.get() + "-refs/heads/master");
    assertThat(refUpdate).isNotNull();
    assertThat(refUpdate.oldRev).isEqualTo(originalHead.name());
    assertThat(refUpdate.newRev).isEqualTo(updatedHead.name());
  }

  @Test
  public void submitTwoChangesWithFastForward_missingDependency() throws Exception {
    RevCommit oldHead = getRemoteHead();
    PushOneCommit.Result change1 = createChange();
    PushOneCommit.Result change2 = createChange();

    Change.Id id1 = change1.getPatchSetId().getParentKey();
    submitWithConflict(change2.getChangeId(),
        "The change could not be submitted because it depends on change(s) [" +
        id1 + "], which could not be submitted because:\n" +
        id1 + ": needs Code-Review;");

    RevCommit head = getRemoteHead();
    assertThat(head.getId()).isEqualTo(oldHead.getId());
  }

  @Test
  public void submitFastForwardNotPossible_Conflict() throws Exception {
    RevCommit initialHead = getRemoteHead();
    PushOneCommit.Result change =
        createChange("Change 1", "a.txt", "content");
    submit(change.getChangeId());

    RevCommit oldHead = getRemoteHead();
    testRepo.reset(initialHead);
    PushOneCommit.Result change2 =
        createChange("Change 2", "b.txt", "other content");

    approve(change2.getChangeId());
    Map<String, ActionInfo> actions = getActions(change2.getChangeId());

    assertThat(actions).containsKey("submit");
    ActionInfo info = actions.get("submit");
    assertThat(info.enabled).isNull();

    submitWithConflict(change2.getChangeId(),
        "Cannot merge " + change2.getCommitId().name() + "\n" +
        "Project policy requires all submissions to be a fast-forward.\n\n" +
        "Please rebase the change locally and upload again for review.");
    assertThat(getRemoteHead()).isEqualTo(oldHead);
    assertSubmitter(change.getChangeId(), 1);
  }
}