// 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.project;

import static com.google.common.truth.Truth.assertThat;
import static com.google.gerrit.acceptance.rest.project.BranchAssert.assertRefNames;
import static org.junit.Assert.fail;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import com.google.gerrit.acceptance.AbstractDaemonTest;
import com.google.gerrit.acceptance.NoHttpd;
import com.google.gerrit.extensions.api.projects.BranchInput;
import com.google.gerrit.extensions.api.projects.DeleteBranchesInput;
import com.google.gerrit.extensions.api.projects.ProjectApi;
import com.google.gerrit.extensions.restapi.ResourceConflictException;
import com.google.gerrit.reviewdb.client.RefNames;

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

import java.util.HashMap;
import java.util.List;

@NoHttpd
public class DeleteBranchesIT extends AbstractDaemonTest {
  private static final List<String> BRANCHES = ImmutableList.of(
      "refs/heads/test-1", "refs/heads/test-2", "refs/heads/test-3");

  @Before
  public void setUp() throws Exception {
    for (String name : BRANCHES) {
      project().branch(name).create(new BranchInput());
    }
    assertBranches(BRANCHES);
  }

  @Test
  public void deleteBranches() throws Exception {
    HashMap<String, RevCommit> initialRevisions = initialRevisions(BRANCHES);
    DeleteBranchesInput input = new DeleteBranchesInput();
    input.branches = BRANCHES;
    project().deleteBranches(input);
    assertBranchesDeleted();
    assertRefUpdatedEvents(initialRevisions);
  }

  @Test
  public void deleteBranchesForbidden() throws Exception {
    DeleteBranchesInput input = new DeleteBranchesInput();
    input.branches = BRANCHES;
    setApiUser(user);
    try {
      project().deleteBranches(input);
      fail("Expected ResourceConflictException");
    } catch (ResourceConflictException e) {
      assertThat(e).hasMessage(errorMessageForBranches(BRANCHES));
    }
    setApiUser(admin);
    assertBranches(BRANCHES);
  }

  @Test
  public void deleteBranchesNotFound() throws Exception {
    DeleteBranchesInput input = new DeleteBranchesInput();
    List<String> branches = Lists.newArrayList(BRANCHES);
    branches.add("refs/heads/does-not-exist");
    input.branches = branches;
    try {
      project().deleteBranches(input);
      fail("Expected ResourceConflictException");
    } catch (ResourceConflictException e) {
      assertThat(e).hasMessage(errorMessageForBranches(
          ImmutableList.of("refs/heads/does-not-exist")));
    }
    assertBranchesDeleted();
  }

  @Test
  public void deleteBranchesNotFoundContinue() throws Exception {
    // If it fails on the first branch in the input, it should still
    // continue to process the remaining branches.
    DeleteBranchesInput input = new DeleteBranchesInput();
    List<String> branches = Lists.newArrayList("refs/heads/does-not-exist");
    branches.addAll(BRANCHES);
    input.branches = branches;
    try {
      project().deleteBranches(input);
      fail("Expected ResourceConflictException");
    } catch (ResourceConflictException e) {
      assertThat(e).hasMessage(errorMessageForBranches(
          ImmutableList.of("refs/heads/does-not-exist")));
    }
    assertBranchesDeleted();
  }

  private String errorMessageForBranches(List<String> branches) {
    StringBuilder message = new StringBuilder();
    for (String branch : branches) {
      message.append("Cannot delete ")
        .append(branch)
        .append(": it doesn't exist or you do not have permission ")
        .append("to delete it\n");
    }
    return message.toString();
  }

  private HashMap<String, RevCommit> initialRevisions(List<String> branches)
      throws Exception {
    HashMap<String, RevCommit> result = new HashMap<>();
    for (String branch : branches) {
      result.put(branch, getRemoteHead(project, branch));
    }
    return result;
  }

  private void assertRefUpdatedEvents(HashMap<String, RevCommit> revisions)
      throws Exception {
    for (String branch : revisions.keySet()) {
      RevCommit revision = revisions.get(branch);
      eventRecorder.assertRefUpdatedEvents(project.get(), branch,
          null, revision,
          revision, null);
    }
  }

  private ProjectApi project() throws Exception {
    return gApi.projects().name(project.get());
  }

  private void assertBranches(List<String> branches) throws Exception {
    List<String> expected = Lists.newArrayList(
        "HEAD", RefNames.REFS_CONFIG, "refs/heads/master");
    expected.addAll(branches);
    assertRefNames(expected, project().branches().get());
  }

  private void assertBranchesDeleted() throws Exception {
    assertBranches(ImmutableList.<String>of());
  }
}