/*
 * Copyright 2014-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.apple;

import static org.hamcrest.Matchers.empty;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.hasItems;
import static org.hamcrest.Matchers.matchesPattern;
import static org.junit.Assert.assertThat;

import com.facebook.buck.io.MoreFiles;
import com.facebook.buck.testutil.TestLogSink;
import com.google.common.base.Charsets;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Optional;
import org.hamcrest.Matchers;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;

public class AppleToolchainDiscoveryTest {

  @Rule public TemporaryFolder temp = new TemporaryFolder();

  @Rule public TestLogSink logSink = new TestLogSink(AppleToolchainDiscovery.class);

  @Test
  public void shouldReturnAnEmptyMapIfNoToolchainsFound() throws IOException {
    Path path = temp.newFolder().toPath().toAbsolutePath();

    ImmutableMap<String, AppleToolchain> toolchains =
        AppleToolchainDiscovery.discoverAppleToolchains(Optional.of(path), ImmutableList.of());
    assertThat(toolchains.entrySet(), empty());
  }

  @Test
  public void appleToolchainPathsBuiltFromDirectory() throws Exception {
    Path root = Paths.get("test/com/facebook/buck/apple/testdata/toolchain-discovery");
    ImmutableMap<String, AppleToolchain> expected =
        ImmutableMap.of(
            "com.facebook.foo.toolchain.XcodeDefault",
            AppleToolchain.builder()
                .setIdentifier("com.facebook.foo.toolchain.XcodeDefault")
                .setVersion("23B456")
                .setPath(root.resolve("Toolchains/foo.xctoolchain"))
                .build(),
            "com.facebook.bar.toolchain.XcodeDefault",
            AppleToolchain.builder()
                .setIdentifier("com.facebook.bar.toolchain.XcodeDefault")
                .setVersion("23B456")
                .setPath(root.resolve("Toolchains/bar.xctoolchain"))
                .build());

    assertThat(
        AppleToolchainDiscovery.discoverAppleToolchains(Optional.of(root), ImmutableList.of()),
        equalTo(expected));
  }

  @Test
  public void appleToolchainPathsBuiltFromExtraDirectories() throws Exception {
    Path path = temp.newFolder().toPath().toAbsolutePath();

    Path root = Paths.get("test/com/facebook/buck/apple/testdata/toolchain-discovery");
    ImmutableMap<String, AppleToolchain> expected =
        ImmutableMap.of(
            "com.facebook.foo.toolchain.XcodeDefault",
            AppleToolchain.builder()
                .setIdentifier("com.facebook.foo.toolchain.XcodeDefault")
                .setVersion("23B456")
                .setPath(root.resolve("Toolchains/foo.xctoolchain"))
                .build(),
            "com.facebook.bar.toolchain.XcodeDefault",
            AppleToolchain.builder()
                .setIdentifier("com.facebook.bar.toolchain.XcodeDefault")
                .setVersion("23B456")
                .setPath(root.resolve("Toolchains/bar.xctoolchain"))
                .build());

    assertThat(
        AppleToolchainDiscovery.discoverAppleToolchains(
            Optional.of(path), ImmutableList.of(root.resolve("Toolchains"))),
        equalTo(expected));
  }

  @Test
  public void appleToolchainPathsIgnoresInvalidExtraPath() throws Exception {
    Path root = Paths.get("test/com/facebook/buck/apple/testdata/toolchain-discovery");
    ImmutableMap<String, AppleToolchain> expected =
        ImmutableMap.of(
            "com.facebook.foo.toolchain.XcodeDefault",
            AppleToolchain.builder()
                .setIdentifier("com.facebook.foo.toolchain.XcodeDefault")
                .setVersion("23B456")
                .setPath(root.resolve("Toolchains/foo.xctoolchain"))
                .build(),
            "com.facebook.bar.toolchain.XcodeDefault",
            AppleToolchain.builder()
                .setIdentifier("com.facebook.bar.toolchain.XcodeDefault")
                .setVersion("23B456")
                .setPath(root.resolve("Toolchains/bar.xctoolchain"))
                .build());

    assertThat(
        AppleToolchainDiscovery.discoverAppleToolchains(
            Optional.of(root), ImmutableList.of(Paths.get("invalid"))),
        equalTo(expected));
  }

  @Test
  @SuppressWarnings("unchecked") // for hasItems
  public void shouldEmitLogMessageWhenFailingToReadToolchainInfo() throws Exception {
    Path root = Paths.get("test/com/facebook/buck/apple/testdata/toolchain-discovery");
    Path tempRoot = temp.getRoot().toPath();
    MoreFiles.copyRecursively(root, tempRoot);
    Files.delete(tempRoot.resolve("Toolchains/foo.xctoolchain/ToolchainInfo.plist"));
    Files.write(
        tempRoot.resolve("Toolchains/bar.xctoolchain/Info.plist"),
        ImmutableList.of("Not a valid plist"),
        Charsets.UTF_8);

    assertThat(
        AppleToolchainDiscovery.discoverAppleToolchains(Optional.of(tempRoot), ImmutableList.of()),
        Matchers.anEmptyMap());
    assertThat(
        logSink.getRecords(),
        hasItems(
            TestLogSink.logRecordWithMessage(
                matchesPattern("Failed to resolve info about toolchain .* from plist files .*"))));
  }
}