// Copyright (C) 2019 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.findowners;

import static com.google.common.truth.OptionalSubject.optionals;
import static com.google.common.truth.Truth.assertThat;
import static com.google.common.truth.Truth.assertWithMessage;

import com.google.common.collect.Multimap;
import com.google.common.flogger.FluentLogger;
import com.google.gerrit.acceptance.PushOneCommit;
import com.google.gerrit.acceptance.RestResponse;
import com.google.gerrit.acceptance.TestPlugin;
import com.google.gerrit.entities.Account;
import com.google.gerrit.extensions.api.accounts.EmailInput;
import com.google.gerrit.extensions.common.ChangeInfo;
import com.google.gerrit.extensions.restapi.Response;
import com.google.gerrit.server.account.AccountState;
import com.google.gerrit.server.change.ChangeResource;
import java.util.Collection;
import java.util.Optional;
import org.junit.Rule;
import org.junit.Test;

/** Test find-owners plugin top level APIs and dependent Gerrit APIs. */
@TestPlugin(name = "find-owners", sysModule = "com.googlesource.gerrit.plugins.findowners.Module")
public class ApiIT extends FindOwners {
  private static final FluentLogger logger = FluentLogger.forEnclosingClass();
  @Rule public Watcher watcher = new Watcher(logger);

  @Test
  public void getOwnersTest() throws Exception {
    ChangeInfo info1 = newChangeInfo("test1 GetOwners");
    ChangeInfo info2 = newChangeInfo("test2 GetOwners");
    assertThat(info2._number).isEqualTo(info1._number + 1);
    String expected =
        ")]}' {addDebugMsg:false,maxCacheAge:0,maxCacheSize:1000,"
            + "minOwnerVoteLevel:1,ownersFileName:OWNERS,rejectErrorInOwners:false,"
            + ("change:" + info1._number)
            + ",patchset:1,"
            + ("owner_revision:" + projectOperations.project(project).getHead(info1.branch).name())
            + ",file2owners:{},reviewers:[],owners:[],files:[]}";
    Cache cache = getCache().init(0, 10); // reset, no Cache
    assertThat(cache.size()).isEqualTo(0L);
    // GetOwners GET API
    assertThat(getOwnersResponse(info1)).isEqualTo(expected);
    assertThat(cache.size()).isEqualTo(0L);
    // find-owners GET API
    assertThat(getFindOwnersResponse(info1)).isEqualTo(expected);
    cache.init(10, 5); // create the Cache
    assertThat(cache.size()).isEqualTo(0L);
    assertThat(getOwnersResponse(info1)).isEqualTo(expected);
    assertThat(getFindOwnersResponse(info1)).isEqualTo(expected);
    assertThat(cache.size()).isEqualTo(1L);
  }

  @Test
  public void requestErrorTest() throws Exception {
    PushOneCommit.Result c1 = createChange("1", "t.c", "##");
    assertThat(getOwnersResponse(c1)).contains("owners:[],files:[t.c]");
    int id = c1.getChange().getId().get();
    // Correct change id.
    String result = userRestSession.get("/changes/" + id + "/owners").getEntityContent();
    assertThat(filteredJson(result)).contains("owners:[],files:[t.c]");
    // Wrong change number, 404 not found.
    RestResponse response = userRestSession.get("/changes/" + (id + 1) + "/owners");
    assertThat(response.getStatusCode()).isEqualTo(404);
    assertThat(response.getEntityContent()).isEqualTo("Not found: " + (id + 1));
    // Wrong request parameter, 400 not a valid option
    response = userRestSession.get("/changes/" + id + "/owners?xyz=3");
    assertThat(response.getStatusCode()).isEqualTo(400);
    assertThat(response.getEntityContent()).isEqualTo("\"--xyz\" is not a valid option");
    // Wrong patchset parameter, no content
    response = userRestSession.get("/changes/" + id + "/owners?patchset=2");
    assertThat(response.getStatusCode()).isEqualTo(204);
    assertThat(response.hasContent()).isFalse();
  }

  @Test
  public void authorDefaultVoteTest() throws Exception {
    // CL author has default +1 owner vote.
    addFile("1", "d1/OWNERS", user.email() + "\n"); // d1 owned by user
    addFile("2", "d2/OWNERS", admin.email() + "\n"); // d2 owned by admin
    // admin is the author of CLs created by createChange.
    PushOneCommit.Result r1 = createChange("r1", "d1/t.c", "Hello1");
    PushOneCommit.Result r2 = createChange("r2", "d2/t.c", "Hello2");
    PushOneCommit.Result r3 = createChange("r3", "d3/t.c", "Hello3");
    assertThat(checkApproval(r1)).isEqualTo(-1); // owner is not change author
    assertThat(checkApproval(r2)).isEqualTo(1); // owner is change author, default +1
    assertThat(checkApproval(r3)).isEqualTo(0); // no owner is found in d3
  }

  @Test
  public void actionApplyTest() throws Exception {
    Cache cache = getCache().init(0, 10);
    assertThat(cache.size()).isEqualTo(0);
    // TODO: create ChangeInput in a new project.
    ChangeInfo changeInfo = newChangeInfo("test Action.apply");
    ChangeResource cr = parseChangeResource(changeInfo.changeId);
    Action.Parameters param = new Action.Parameters();
    Action action =
        new Action(
            permissionBackend,
            pluginConfig,
            null,
            changeDataFactory,
            accountCache,
            emails,
            repoManager,
            projectCache);
    Response<RestResult> response = action.apply(cr, param);
    RestResult result = response.value();
    verifyRestResult(result, 1, 1, changeInfo._number, false);
    param.debug = true;
    response = action.apply(cr, param);
    result = response.value();
    verifyRestResult(result, 1, 1, changeInfo._number, true);
    assertThat(result.dbgmsgs.user).isEqualTo("?");
    assertThat(result.dbgmsgs.project).isEqualTo(changeInfo.project);
    // changeInfo.branch is "master" but result.dbgmsgs.branch is "refs/heads/master".
    assertThat(result.dbgmsgs.branch).contains(changeInfo.branch);
    assertThat(result.dbgmsgs.path2owners).isEmpty();
    assertThat(result.dbgmsgs.owner2paths).isEmpty();
    assertThat(result.file2owners).isEmpty();
    assertThat(result.reviewers).isEmpty();
    assertThat(result.owners).isEmpty();
    assertThat(result.files).isEmpty();
    // TODO: find expected value of ownerRevision.
    assertThat(cache.size()).isEqualTo(0);
  }

  @Test
  public void accountTest() throws Exception {
    String[] users = {"findowners1", "findowners2", "findowners3"};
    String[] emails1 = {"abc@g.com", "abc+xyz@g.com", "xyz-team+review@g.com"};
    String[] emails2 = {"abc@goog.com", "abc+xyz2@g.com", "xyz-team@goog.com"};
    // Create accounts with given user name, first and second email addresses.
    for (int i = 0; i < users.length; i++) {
      accountCreator.create(users[i], emails1[i], "FullName " + users[i], null);
      EmailInput input = new EmailInput();
      input.email = emails2[i];
      input.noConfirmation = true;
      gApi.accounts().id(users[i]).addEmail(input);
    }
    // Find accounts with given first and second email addresses.
    // OwnersDb uses either emails.getAccountFor or getAccountsFor to get preferred email addresses.
    Multimap<String, Account.Id> map1 = emails.getAccountsFor(emails1);
    Multimap<String, Account.Id> map2 = emails.getAccountsFor(emails2);
    for (int i = 0; i < users.length; i++) {
      Collection<Account.Id> ids1 = emails.getAccountFor(emails1[i]);
      Collection<Account.Id> ids2 = emails.getAccountFor(emails2[i]);
      Collection<Account.Id> ids3 = map1.get(emails1[i]);
      Collection<Account.Id> ids4 = map2.get(emails2[i]);
      assertThat(ids1).hasSize(1);
      assertThat(ids2).hasSize(1);
      assertThat(ids3).hasSize(1);
      assertThat(ids4).hasSize(1);
      Account.Id id1 = ids1.iterator().next();
      Account.Id id2 = ids2.iterator().next();
      Account.Id id3 = ids3.iterator().next();
      Account.Id id4 = ids4.iterator().next();
      assertThat(id1).isEqualTo(id2); // Both emails should find the same account.
      assertThat(id1).isEqualTo(id3);
      assertThat(id1).isEqualTo(id4);
      // Action.getReviewers and Checker.getVotes use accountCache to get email address.
      Optional<Account> account = accountCache.get(id1).map(AccountState::account);
      assertWithMessage("account %s", id1).about(optionals()).that(account).isPresent();
      assertThat(account.get().preferredEmail()).isEqualTo(emails1[i]);
    }
    // Wrong or non-existing email address.
    String[] wrongEmails = {"nobody", "@g.com", "nobody@g.com", "*"};
    Multimap<String, Account.Id> email2ids = emails.getAccountsFor(wrongEmails);
    for (String email : wrongEmails) {
      assertThat(emails.getAccountFor(email)).isEmpty();
      assertThat(email2ids).doesNotContainKey(email);
    }
  }
}