// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
//
// 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 google.registry.tools;

import static com.google.common.io.BaseEncoding.base16;
import static com.google.common.truth.Truth.assertThat;
import static google.registry.testing.DatastoreHelper.createTlds;
import static google.registry.testing.DatastoreHelper.newDomainResource;
import static google.registry.testing.DatastoreHelper.newHostResource;
import static google.registry.testing.DatastoreHelper.persistActiveDomain;
import static google.registry.testing.DatastoreHelper.persistActiveHost;
import static google.registry.testing.DatastoreHelper.persistResource;
import static java.nio.charset.StandardCharsets.UTF_8;
import static org.joda.time.DateTimeZone.UTC;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.net.InetAddresses;

import com.beust.jcommander.ParameterException;
import com.googlecode.objectify.Ref;

import google.registry.model.domain.DomainResource;
import google.registry.model.domain.ReferenceUnion;
import google.registry.model.domain.secdns.DelegationSignerData;
import google.registry.model.eppcommon.StatusValue;
import google.registry.model.host.HostResource;
import google.registry.testing.FakeClock;

import org.joda.time.DateTime;
import org.json.simple.JSONValue;
import org.json.simple.parser.ParseException;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;

import java.io.IOException;
import java.io.Reader;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

/** Unit tests for {@link GenerateDnsReportCommand}. */
public class GenerateDnsReportCommandTest extends CommandTestCase<GenerateDnsReportCommand> {

  @Rule
  public final TemporaryFolder folder = new TemporaryFolder();

  private final DateTime now = DateTime.now(UTC);
  private final FakeClock clock = new FakeClock();
  private Path output;

  private Object getOutputAsJson() throws IOException, ParseException {
    try (Reader reader = Files.newBufferedReader(output, UTF_8)) {
      return JSONValue.parseWithException(reader);
    }
  }

  private HostResource nameserver1;
  private HostResource nameserver2;
  private HostResource nameserver3;
  private HostResource nameserver4;
  private DomainResource domain1;

  private static final ImmutableMap<String, ?> DOMAIN1_OUTPUT = ImmutableMap.of(
      "domain", "example.xn--q9jyb4c",
      "nameservers", ImmutableList.of(
          "ns1.example.xn--q9jyb4c",
          "ns2.example.xn--q9jyb4c"),
      "dsData", ImmutableList.of(
          ImmutableMap.of(
              "keyTag", 12345L,
              "algorithm", 3L,
              "digestType", 1L,
              "digest", "49FD46E6C4B45C55D4AC"),
          ImmutableMap.of(
              "keyTag", 56789L,
              "algorithm", 2L,
              "digestType", 4L,
              "digest", "69FD46E6C4A45C55D4AC")));

  private static final ImmutableMap<String, ?> DOMAIN2_OUTPUT = ImmutableMap.of(
      "domain", "foobar.xn--q9jyb4c",
      "nameservers", ImmutableList.of(
          "ns1.google.com",
          "ns2.google.com"));

  private static final ImmutableMap<String, ?> NAMESERVER1_OUTPUT = ImmutableMap.of(
      "host", "ns1.example.xn--q9jyb4c",
      "ips", ImmutableList.of(
          "192.168.1.2",
          "2607:f8b0:400d:c00:0:0:0:c0"));

  private static final ImmutableMap<String, ?> NAMESERVER2_OUTPUT = ImmutableMap.of(
      "host", "ns2.example.xn--q9jyb4c",
      "ips", ImmutableList.of(
          "192.168.1.1",
          "2607:f8b0:400d:c00:0:0:0:c1"));

  @Before
  public void init() throws Exception {
    output = Paths.get(folder.newFile().toString());
    command.clock = clock;
    clock.setTo(now);

    createTlds("xn--q9jyb4c", "example");
    nameserver1 = persistResource(
        newHostResource("ns1.example.xn--q9jyb4c")
            .asBuilder()
            .setInetAddresses(ImmutableSet.of(
                InetAddresses.forString("2607:f8b0:400d:c00::c0"),
                InetAddresses.forString("192.168.1.2")))
            .build());
    nameserver2 = persistResource(
        newHostResource("ns2.example.xn--q9jyb4c")
            .asBuilder()
            .setInetAddresses(ImmutableSet.of(
                InetAddresses.forString("192.168.1.1"),
                InetAddresses.forString("2607:f8b0:400d:c00::c1")))
            .build());
    nameserver3 = persistActiveHost("ns1.google.com");
    nameserver4 = persistActiveHost("ns2.google.com");
    domain1 = persistResource(newDomainResource("example.xn--q9jyb4c").asBuilder()
        .setNameservers(ImmutableSet.of(
            ReferenceUnion.create(Ref.create(nameserver1)),
            ReferenceUnion.create(Ref.create(nameserver2))))
        .setDsData(ImmutableSet.of(
            DelegationSignerData.create(12345, 3, 1, base16().decode("49FD46E6C4B45C55D4AC")),
            DelegationSignerData.create(56789, 2, 4, base16().decode("69FD46E6C4A45C55D4AC"))))
        .build());
    persistResource(newDomainResource("foobar.xn--q9jyb4c").asBuilder()
        .setNameservers(ImmutableSet.of(
            ReferenceUnion.create(Ref.create(nameserver3)),
            ReferenceUnion.create(Ref.create(nameserver4))))
        .build());
    // Persist a domain in a different tld that should be ignored.
    persistActiveDomain("should-be-ignored.example");
  }

  @Test
  public void testSuccess() throws Exception {
    runCommand("--output=" + output, "--tld=xn--q9jyb4c");
    assertThat(getOutputAsJson()).isEqualTo(
        ImmutableList.of(DOMAIN1_OUTPUT, DOMAIN2_OUTPUT, NAMESERVER1_OUTPUT, NAMESERVER2_OUTPUT));
  }

  @Test
  public void testSuccess_skipDeletedDomain() throws Exception {
    persistResource(domain1.asBuilder().setDeletionTime(now).build());
    runCommand("--output=" + output, "--tld=xn--q9jyb4c");
    assertThat(getOutputAsJson())
        .isEqualTo(ImmutableList.of(DOMAIN2_OUTPUT, NAMESERVER1_OUTPUT, NAMESERVER2_OUTPUT));
  }

  @Test
  public void testSuccess_skipDeletedNameserver() throws Exception {
    persistResource(
        nameserver1.asBuilder().setDeletionTime(now).build());
    runCommand("--output=" + output, "--tld=xn--q9jyb4c");
    assertThat(getOutputAsJson())
        .isEqualTo(ImmutableList.of(DOMAIN1_OUTPUT, DOMAIN2_OUTPUT, NAMESERVER2_OUTPUT));
  }

  @Test
  public void testSuccess_skipClientHoldDomain() throws Exception {
    persistResource(domain1.asBuilder().addStatusValue(StatusValue.CLIENT_HOLD).build());
    runCommand("--output=" + output, "--tld=xn--q9jyb4c");
    assertThat(getOutputAsJson())
        .isEqualTo(ImmutableList.of(DOMAIN2_OUTPUT, NAMESERVER1_OUTPUT, NAMESERVER2_OUTPUT));
  }

  @Test
  public void testSuccess_skipServerHoldDomain() throws Exception {
    persistResource(domain1.asBuilder().addStatusValue(StatusValue.SERVER_HOLD).build());
    runCommand("--output=" + output, "--tld=xn--q9jyb4c");
    assertThat(getOutputAsJson())
        .isEqualTo(ImmutableList.of(DOMAIN2_OUTPUT, NAMESERVER1_OUTPUT, NAMESERVER2_OUTPUT));
  }

  @Test
  public void testSuccess_skipPendingDeleteDomain() throws Exception {
    persistResource(domain1.asBuilder()
        .addStatusValue(StatusValue.PENDING_DELETE)
        .setDeletionTime(now.plusDays(30))
        .build());
    runCommand("--output=" + output, "--tld=xn--q9jyb4c");
    assertThat(getOutputAsJson())
        .isEqualTo(ImmutableList.of(DOMAIN2_OUTPUT, NAMESERVER1_OUTPUT, NAMESERVER2_OUTPUT));
  }

  @Test
  public void testSuccess_skipDomainsWithoutNameservers() throws Exception {
    persistResource(domain1.asBuilder().setNameservers(null).build());
    runCommand("--output=" + output, "--tld=xn--q9jyb4c");
    assertThat(getOutputAsJson())
        .isEqualTo(ImmutableList.of(DOMAIN2_OUTPUT, NAMESERVER1_OUTPUT, NAMESERVER2_OUTPUT));
  }

  @Test
  public void testFailure_tldDoesNotExist() throws Exception {
    thrown.expect(IllegalArgumentException.class);
    runCommand("--tld=foobar");
  }

  @Test
  public void testFailure_missingTldParameter() throws Exception {
    thrown.expect(ParameterException.class);
    runCommand("");
  }
}