// 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.rest.change;

import static com.google.common.truth.Truth.assertThat;
import static com.google.gerrit.server.group.SystemGroupBackend.REGISTERED_USERS;
import static java.nio.charset.StandardCharsets.UTF_8;
import static org.junit.Assert.fail;

import com.google.gerrit.acceptance.AbstractDaemonTest;
import com.google.gerrit.acceptance.PushOneCommit;
import com.google.gerrit.acceptance.TestProjectInput;
import com.google.gerrit.common.data.Permission;
import com.google.gerrit.extensions.api.changes.ReviewInput;
import com.google.gerrit.extensions.api.projects.ProjectInput;
import com.google.gerrit.extensions.client.ChangeStatus;
import com.google.gerrit.extensions.restapi.ResourceConflictException;
import com.google.gerrit.server.git.ProjectConfig;
import com.google.gerrit.server.project.Util;

import org.eclipse.jgit.lib.Config;
import org.eclipse.jgit.lib.ObjectLoader;
import org.eclipse.jgit.revwalk.RevObject;
import org.eclipse.jgit.revwalk.RevTree;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.transport.RefSpec;
import org.junit.Before;
import org.junit.Test;

public class ConfigChangeIT extends AbstractDaemonTest {
  @Before
  public void setUp() throws Exception {
    ProjectConfig cfg = projectCache.checkedGet(project).getConfig();
    Util.allow(cfg, Permission.OWNER, REGISTERED_USERS, "refs/*");
    Util.allow(
        cfg, Permission.PUSH, REGISTERED_USERS, "refs/for/refs/meta/config");
    Util.allow(cfg, Permission.SUBMIT, REGISTERED_USERS, "refs/meta/config");
    saveProjectConfig(project, cfg);

    setApiUser(user);
    fetchRefsMetaConfig();
  }

  @Test
  @TestProjectInput(cloneAs = "user")
  public void updateProjectConfig() throws Exception {
    Config cfg = readProjectConfig();
    assertThat(cfg.getString("project", null, "description")).isNull();
    String desc = "new project description";
    cfg.setString("project", null, "description", desc);

    PushOneCommit.Result r = createConfigChange(cfg);
    String id = r.getChangeId();

    gApi.changes().id(id).current().review(ReviewInput.approve());
    gApi.changes().id(id).current().submit();

    assertThat(gApi.changes().id(id).info().status)
        .isEqualTo(ChangeStatus.MERGED);
    assertThat(gApi.projects().name(project.get()).get().description)
        .isEqualTo(desc);
    fetchRefsMetaConfig();
    assertThat(readProjectConfig().getString("project", null, "description"))
        .isEqualTo(desc);
  }

  @Test
  @TestProjectInput(cloneAs = "user")
  public void onlyAdminMayUpdateProjectParent() throws Exception {
    setApiUser(admin);
    ProjectInput parent = new ProjectInput();
    parent.name = name("parent");
    parent.permissionsOnly = true;
    gApi.projects().create(parent);

    setApiUser(user);
    Config cfg = readProjectConfig();
    assertThat(cfg.getString("access", null, "inheritFrom"))
        .isAnyOf(null, allProjects.get());
    cfg.setString("access", null, "inheritFrom", parent.name);

    PushOneCommit.Result r = createConfigChange(cfg);
    String id = r.getChangeId();

    gApi.changes().id(id).current().review(ReviewInput.approve());
    try {
      gApi.changes().id(id).current().submit();
      fail("expected submit to fail");
    } catch (ResourceConflictException e) {
      assertThat(e).hasMessage(
          "Cannot merge " + r.getCommit().name() + "\n"
          + "Change contains a project configuration that changes the parent"
          + " project.\n"
          + "The change must be submitted by a Gerrit administrator.");
    }

    assertThat(gApi.projects().name(project.get()).get().parent)
        .isEqualTo(allProjects.get());
    fetchRefsMetaConfig();
    assertThat(readProjectConfig().getString("access", null, "inheritFrom"))
        .isAnyOf(null, allProjects.get());

    setApiUser(admin);
    gApi.changes().id(id).current().submit();
    assertThat(gApi.changes().id(id).info().status)
        .isEqualTo(ChangeStatus.MERGED);
    assertThat(gApi.projects().name(project.get()).get().parent)
        .isEqualTo(parent.name);
    fetchRefsMetaConfig();
    assertThat(readProjectConfig().getString("access", null, "inheritFrom"))
        .isEqualTo(parent.name);
  }

  private void fetchRefsMetaConfig() throws Exception {
    git().fetch().setRefSpecs(new RefSpec("refs/meta/config:refs/meta/config"))
        .call();
    testRepo.reset("refs/meta/config");
  }

  private Config readProjectConfig() throws Exception {
    RevWalk rw = testRepo.getRevWalk();
    RevTree tree = rw.parseTree(testRepo.getRepository().resolve("HEAD"));
    RevObject obj = rw.parseAny(testRepo.get(tree, "project.config"));
    ObjectLoader loader = rw.getObjectReader().open(obj);
    String text = new String(loader.getCachedBytes(), UTF_8);
    Config cfg = new Config();
    cfg.fromText(text);
    return cfg;
  }

  private PushOneCommit.Result createConfigChange(Config cfg) throws Exception {
    PushOneCommit.Result r = pushFactory.create(
            db, user.getIdent(), testRepo,
            "Update project config",
            "project.config",
            cfg.toText())
        .to("refs/for/refs/meta/config");
    r.assertOkStatus();
    return r;
  }
}