/*
 * Copyright 2013-present Facebook, Inc.
 *
 * 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.facebook.buck.cli;

import static org.junit.Assert.assertEquals;

import com.facebook.buck.testutil.integration.DebuggableTemporaryFolder;
import com.facebook.buck.testutil.integration.ProjectWorkspace;
import com.facebook.buck.testutil.integration.ProjectWorkspace.ProcessResult;
import com.facebook.buck.testutil.integration.TestDataHelper;
import com.google.common.base.Joiner;

import org.junit.Rule;
import org.junit.Test;

import java.io.IOException;

/**
 * Integration test for the {@code buck build} command with no arguments.
 */
public class BuildWithNoTargetSpecifiedIntegrationTest {

  @Rule
  public DebuggableTemporaryFolder temporaryFolder = new DebuggableTemporaryFolder();

  @Test
  public void testBuckBuildWithoutTarget() throws IOException {
    ProjectWorkspace workspace = TestDataHelper.createProjectWorkspaceForScenario(
        this, "project_with_no_alias", temporaryFolder);
    workspace.setUp();

    ProcessResult result = workspace.runBuckCommand("build");
    result.assertExitCode("buck build should exit with an error.", 1);

    assertEquals(
        "`buck build` should display an error message if no targets are provided.",
        "BUILD FAILED: Must specify at least one build target.\n",
        result.getStderr());
  }

  @Test
  public void testBuckBuildWithoutTargetWithSingleAliasConfigured() throws IOException {
    ProjectWorkspace workspace = TestDataHelper.createProjectWorkspaceForScenario(
        this, "project_with_one_alias", temporaryFolder);
    workspace.setUp();

    ProcessResult result = workspace.runBuckCommand("build");
    result.assertExitCode("buck build should exit with an error.", 1);

    assertEquals(
        "`buck build` should suggest the alias found in .buckconfig as a target.",
        Joiner.on('\n').join(
            "BUILD FAILED: Must specify at least one build target.",
            "Try building one of the following targets:",
            "myapp") + '\n',
        result.getStderr());
  }

  /**
   * Ensure that if there are multiple aliases (but less than ten) they
   * are all displayed as targets in the order specified in .buckconfig.
   */
  @Test
  public void testBuckBuildWithoutTargetWithUnderTenAliasesConfigured() throws IOException {
    ProjectWorkspace workspace = TestDataHelper.createProjectWorkspaceForScenario(
        this, "project_with_five_aliases", temporaryFolder);
    workspace.setUp();

    ProcessResult result = workspace.runBuckCommand("build");
    result.assertExitCode("buck build should exit with an error.", 1);

    assertEquals(
        Joiner.on(' ').join(
            "`buck build` should suggest the five aliases found in .buckconfig",
            "(in the order in which they are listed in) as targets."),
        Joiner.on('\n').join(
            "BUILD FAILED: Must specify at least one build target.",
            "Try building one of the following targets:",
            "myapp my_app mi_app mon_app mein_app") + '\n',
        result.getStderr());
  }

  /**
   * Ensure that if there are more than ten aliases only the first ten
   * (based on the order specified in .buckconfig) are displayed as targets.
   */
  @Test
  public void testBuckBuildWithoutTargetWithOverTenAliasesConfigured() throws IOException {
    ProjectWorkspace workspace = TestDataHelper.createProjectWorkspaceForScenario(
        this, "project_with_fifteen_aliases", temporaryFolder);
    workspace.setUp();

    ProcessResult result = workspace.runBuckCommand("build");
    result.assertExitCode("buck build should exit with an error.", 1);

    assertEquals(
        Joiner.on(' ').join(
            "`buck build` should suggest the first ten aliases found in .buckconfig",
            "(in the order in which they are listed in) as targets."),
        Joiner.on('\n').join(
            "BUILD FAILED: Must specify at least one build target.",
            "Try building one of the following targets:",
            "myapp my_app mi_app mon_app mein_app alias0 alias1 alias2 alias3 alias4") + '\n',
        result.getStderr());
  }

}