// Copyright (C) 2018 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.rules;

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

import com.google.gerrit.acceptance.AbstractDaemonTest;
import com.google.gerrit.acceptance.NoHttpd;
import com.google.gerrit.acceptance.PushOneCommit;
import com.google.gerrit.common.data.SubmitRecord;
import com.google.gerrit.reviewdb.client.RefNames;
import com.google.gerrit.server.project.SubmitRuleEvaluator;
import com.google.gerrit.server.project.SubmitRuleOptions;
import com.google.gerrit.server.query.change.ChangeData;
import com.google.inject.Inject;
import java.util.Collection;
import org.eclipse.jgit.internal.storage.dfs.InMemoryRepository;
import org.eclipse.jgit.junit.TestRepository;
import org.eclipse.jgit.lib.Repository;
import org.junit.Before;
import org.junit.Test;

/**
 * Tests the Prolog rules to make sure they work even when the change and account indexes are not
 * available.
 */
@NoHttpd
public class RulesIT extends AbstractDaemonTest {
  private static final String RULE_TEMPLATE =
      "submit_rule(submit(W)) :- \n" + "%s,\n" + "W = label('OK', ok(user(1000000))).";

  @Inject private SubmitRuleEvaluator.Factory evaluatorFactory;

  @Before
  public void setUp() {
    // We don't want caches to interfere with our tests. If we didn't, the cache would take
    // precedence over the index, which would never be called.
    baseConfig.setString("cache", "changes", "memoryLimit", "0");
    baseConfig.setString("cache", "projects", "memoryLimit", "0");
  }

  @Test
  public void testUnresolvedCommentsCountPredicate() throws Exception {
    modifySubmitRules("gerrit:unresolved_comments_count(0)");
    assertThat(statusForRule()).isEqualTo(SubmitRecord.Status.OK);
  }

  @Test
  public void testUploaderPredicate() throws Exception {
    modifySubmitRules("gerrit:uploader(U)");
    assertThat(statusForRule()).isEqualTo(SubmitRecord.Status.OK);
  }

  @Test
  public void testUnresolvedCommentsCount() throws Exception {
    modifySubmitRules("gerrit:commit_message_matches('.*')");
    assertThat(statusForRule()).isEqualTo(SubmitRecord.Status.OK);
  }

  @Test
  public void testUserPredicate() throws Exception {
    modifySubmitRules(
        String.format(
            "gerrit:commit_author(user(%d), '%s', '%s')",
            user.getId().get(), user.fullName, user.email));
    assertThat(statusForRule()).isEqualTo(SubmitRecord.Status.OK);
  }

  @Test
  public void testCommitAuthorPredicate() throws Exception {
    modifySubmitRules("gerrit:commit_author(Id)");
    assertThat(statusForRule()).isEqualTo(SubmitRecord.Status.OK);
  }

  private SubmitRecord.Status statusForRule() throws Exception {
    String oldHead = getRemoteHead().name();
    PushOneCommit.Result result1 =
        pushFactory.create(db, user.getIdent(), testRepo).to("refs/for/master");
    testRepo.reset(oldHead);
    ChangeData cd = result1.getChange();

    Collection<SubmitRecord> records;
    try (AutoCloseable changeIndex = disableChangeIndex()) {
      try (AutoCloseable accountIndex = disableAccountIndex()) {
        SubmitRuleEvaluator ruleEvaluator = evaluatorFactory.create(SubmitRuleOptions.defaults());
        records = ruleEvaluator.evaluate(cd);
      }
    }

    assertThat(records).hasSize(1);
    SubmitRecord record = records.iterator().next();
    return record.status;
  }

  private void modifySubmitRules(String ruleTested) throws Exception {
    String newContent = String.format(RULE_TEMPLATE, ruleTested);

    try (Repository repo = repoManager.openRepository(project)) {
      TestRepository<?> testRepo = new TestRepository<>((InMemoryRepository) repo);
      testRepo
          .branch(RefNames.REFS_CONFIG)
          .commit()
          .author(admin.getIdent())
          .committer(admin.getIdent())
          .add("rules.pl", newContent)
          .message("Modify rules.pl")
          .create();
    }
  }
}