// Copyright 2017 The Bazel 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 com.google.devtools.build.android;

import static com.google.common.truth.Truth.assertThat;
import static com.google.common.truth.Truth.assertWithMessage;
import static com.google.devtools.build.android.SplitConfigurationFilter.mapFilenamesToSplitFlags;

import com.google.common.collect.ImmutableList;
import com.google.common.testing.EqualsTester;
import com.google.common.truth.BooleanSubject;
import com.google.devtools.build.android.SplitConfigurationFilter.ResourceConfiguration;
import com.google.devtools.build.android.SplitConfigurationFilter.UnrecognizedSplitsException;
import javax.annotation.CheckReturnValue;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Tests for {@link SplitConfigurationFilter}. */
@RunWith(JUnit4.class)
public final class SplitConfigurationFilterTest {

  @Test
  public void mapFilenamesToSplitFlagsShouldReturnEmptyMapForEmptyInput()
      throws UnrecognizedSplitsException {
    assertThat(mapFilenamesToSplitFlags(ImmutableList.<String>of(), ImmutableList.<String>of()))
        .isEmpty();
  }

  @Test
  public void mapFilenamesToSplitFlagsShouldMatchIdenticalFilenames()
      throws UnrecognizedSplitsException {
    assertThat(mapFilenamesToSplitFlags(ImmutableList.of("en"), ImmutableList.of("en")))
        .containsExactly("en", "en");
    assertThat(mapFilenamesToSplitFlags(ImmutableList.of("fr-v7"), ImmutableList.of("fr-v7")))
        .containsExactly("fr-v7", "fr-v7");
    assertThat(mapFilenamesToSplitFlags(ImmutableList.of("en_fr-v7"), ImmutableList.of("en,fr-v7")))
        .containsExactly("en_fr-v7", "en_fr-v7");
    assertThat(
            mapFilenamesToSplitFlags(
                ImmutableList.of("en", "fr-v7"), ImmutableList.of("en", "fr-v7")))
        .containsExactly("en", "en", "fr-v7", "fr-v7");
    assertThat(
            mapFilenamesToSplitFlags(
                ImmutableList.of("fr-v4", "fr-v7"), ImmutableList.of("fr-v4", "fr-v7")))
        .containsExactly("fr-v4", "fr-v4", "fr-v7", "fr-v7");
  }

  @Test
  public void mapFilenamesToSplitFlagsShouldMatchReorderedFilenames()
      throws UnrecognizedSplitsException {
    assertThat(mapFilenamesToSplitFlags(ImmutableList.of("en_fr_ja"), ImmutableList.of("ja,fr,en")))
        .containsExactly("en_fr_ja", "ja_fr_en");
    assertThat(
            mapFilenamesToSplitFlags(
                ImmutableList.of("zu_12key", "zu"), ImmutableList.of("12key,zu", "zu")))
        .containsExactly("zu_12key", "12key_zu", "zu", "zu");
    assertThat(
            mapFilenamesToSplitFlags(
                ImmutableList.of("land_car", "round_port"),
                ImmutableList.of("car,land", "port,round")))
        .containsExactly("land_car", "car_land", "round_port", "port_round");
  }

  @Test
  public void mapFilenamesToSplitFlagsShouldMatchVersionUpgradedFilenames()
      throws UnrecognizedSplitsException {
    assertThat(mapFilenamesToSplitFlags(ImmutableList.of("round-v23"), ImmutableList.of("round")))
        .containsExactly("round-v23", "round");
    assertThat(
            mapFilenamesToSplitFlags(
                ImmutableList.of("watch-v20", "watch-v23"), ImmutableList.of("watch", "watch-v23")))
        .containsExactly("watch-v20", "watch", "watch-v23", "watch-v23");
  }

  @Test
  public void equivalentFiltersShouldMatchFilterFromFilename() {
    // identical inputs (barring commas -> underscores) should naturally match
    assertMatchesFilterFromFilename("abc-def", "abc-def").isTrue();
    assertMatchesFilterFromFilename("abc-def-v5,ghi,jkl-lmno", "abc-def-v5_ghi_jkl-lmno").isTrue();
    // anything that results in matching sets should work, so case should be ignored
    assertMatchesFilterFromFilename("abc-dEF", "aBC-def").isTrue();
    assertMatchesFilterFromFilename("aBC-def", "abc-dEF").isTrue();
    // additionally, order of elements in the set should be ignored
    assertMatchesFilterFromFilename("abc,def", "def_abc").isTrue();
    assertMatchesFilterFromFilename("def,abc", "abc_def").isTrue();
  }

  @Test
  public void matchingSpecifiersShouldMatchFilterFromFilenameWhenVersionsAreHigherNotWhenLower() {
    // different (higher) versions, but same specifiers and same order
    assertMatchesFilterFromFilename("x-v5,y-v6", "x-v7_y-v9").isTrue();
    assertMatchesFilterFromFilename("x-v7,y-v9", "x-v5_y-v6").isFalse();
    // order of sorted set changes but matching specifiers still match and filename version > flag
    assertMatchesFilterFromFilename("x-v3,y-v6", "x-v23_y-v9").isTrue();
    assertMatchesFilterFromFilename("x-v23,y-v9", "x-v3_y-v6").isFalse();
    // specifier sets of multiple configs are the same
    assertMatchesFilterFromFilename("x-v3,x-v17", "x-v3_x-v17").isTrue();
    assertMatchesFilterFromFilename("x-v3,x-v17", "x-v17_x-v3").isTrue();
    assertMatchesFilterFromFilename("x-v17,x-v3", "x-v17_x-v3").isTrue();
    assertMatchesFilterFromFilename("x-v17,x-v3", "x-v3_x-v17").isTrue();
    // specifier sets are the same, but one of them got a version bump
    assertMatchesFilterFromFilename("x-v3,x-v17", "x-v14_x-v17").isTrue();
    assertMatchesFilterFromFilename("x-v14,x-v17", "x-v3_x-v17").isFalse();
  }

  @Test
  public void nonMatchingSpecifiersShouldNotMatchFilterFromFilename() {
    // completely disjoint specifier sets
    assertMatchesFilterFromFilename("x,y,z", "a_b_c").isFalse();
    assertMatchesFilterFromFilename("a,b,c", "x_y_z").isFalse();
    // different number of specifier sets, which otherwise match
    assertMatchesFilterFromFilename("x,y,z", "x_y").isFalse();
    assertMatchesFilterFromFilename("x,y", "x_y_z").isFalse();
    // same number of specifiers with one non-match
    assertMatchesFilterFromFilename("x,y,z", "a_y_z").isFalse();
    assertMatchesFilterFromFilename("a,b,c", "a_b_z").isFalse();
  }

  @CheckReturnValue
  private BooleanSubject assertMatchesFilterFromFilename(String flagFilter, String filenameFilter) {
    return assertWithMessage(
            "The split flag '%s' would be a match for a filename containing '%s'",
            flagFilter, filenameFilter)
        .that(
            SplitConfigurationFilter.fromSplitFlag(flagFilter)
                .matchesFilterFromFilename(
                    SplitConfigurationFilter.fromFilenameSuffix(filenameFilter)));
  }

  @Test
  public void splitConfigurationFilterShouldBeOrderedByConfigsThenFilename() {
    assertThat(
            ImmutableList.of(
                // If all else is equal, break ties via filename (case does matter here)
                SplitConfigurationFilter.fromFilenameSuffix("A"),
                SplitConfigurationFilter.fromFilenameSuffix("a"),
                // In filters with the same number of configs, the highest version wins
                SplitConfigurationFilter.fromFilenameSuffix("d-v5_e-v5_f-v5"),
                SplitConfigurationFilter.fromFilenameSuffix("a_b_c-v6"),
                // It doesn't matter where in the input order that version is
                SplitConfigurationFilter.fromFilenameSuffix("a-v7_b_c"),
                // Specifiers break ties on number of configs + highest version
                SplitConfigurationFilter.fromFilenameSuffix("d-v7_b_c"),
                // Second highest version breaks ties (etc.)
                SplitConfigurationFilter.fromFilenameSuffix("b-v2_d-v7_c"),
                // Order doesn't matter but it does change the filename, hence sort order
                SplitConfigurationFilter.fromFilenameSuffix("d-v7_b-v2_c"),
                // Number of configs is the main criterion, so more sets of configs means later sort
                SplitConfigurationFilter.fromFilenameSuffix("a_b_c_d_e_f_g_h_i_j_k_l_m")))
        .isStrictlyOrdered();

    // if they are actually equal, they will compare equal
    assertThat(SplitConfigurationFilter.fromFilenameSuffix("c-v13"))
        .isEquivalentAccordingToCompareTo(SplitConfigurationFilter.fromFilenameSuffix("c-v13"));

    // if the only difference is split flag vs. filename suffix they will compare equal
    assertThat(SplitConfigurationFilter.fromSplitFlag("split,split"))
        .isEquivalentAccordingToCompareTo(
            SplitConfigurationFilter.fromFilenameSuffix("split_split"));
  }

  @Test
  public void splitConfigurationFilterEqualsShouldPassEqualsTester() {
    new EqualsTester()
        .addEqualityGroup(
            // base example
            SplitConfigurationFilter.fromFilenameSuffix("abc-def_ghi_jkl"),
            // identical clone
            SplitConfigurationFilter.fromFilenameSuffix("abc-def_ghi_jkl"),
            // commas are converted for split flags, the result is equal
            SplitConfigurationFilter.fromSplitFlag("abc-def,ghi,jkl"))
        .addEqualityGroup(
            // case matters for filenames
            SplitConfigurationFilter.fromFilenameSuffix("aBC-dEF_ghi_jkl"))
        .addEqualityGroup(
            // different filename producing equal set (elements parse the same) is still different
            SplitConfigurationFilter.fromFilenameSuffix("abc-def-v0_ghi_jkl"))
        .addEqualityGroup(
            // different filename producing equal set (input order is different) is still different
            SplitConfigurationFilter.fromFilenameSuffix("ghi_abc-def_jkl"))
        .addEqualityGroup(
            // totally different set is also very clearly different
            SplitConfigurationFilter.fromFilenameSuffix("some-other_specifiers"))
        .testEquals();
  }

  @Test
  public void equalInputsShouldMatchConfigurationFromFilename() {
    // identical inputs should naturally match
    assertMatchesConfigurationFromFilename("abc-def", "abc-def").isTrue();
    assertMatchesConfigurationFromFilename("abc-def-v5", "abc-def-v5").isTrue();
    // case should be ignored
    assertMatchesConfigurationFromFilename("abc-dEF", "aBC-def").isTrue();
    assertMatchesConfigurationFromFilename("aBC-def", "abc-dEF").isTrue();
    // wildcards should be ignored
    assertMatchesConfigurationFromFilename("any-abc-def", "abc-any-def").isTrue();
    assertMatchesConfigurationFromFilename("abc-any-def", "any-abc-def").isTrue();
    // v0 should be ignored
    assertMatchesConfigurationFromFilename("abc-def", "abc-def-v0").isTrue();
    assertMatchesConfigurationFromFilename("abc-def-v0", "abc-def").isTrue();
  }

  @Test
  public void higherVersionSameSpecifiersShouldMatchConfigurationFromFilename() {
    // any version is higher than the default v0
    assertMatchesConfigurationFromFilename("abc-def", "abc-def-v1").isTrue();
    assertMatchesConfigurationFromFilename("abc-def-v1", "abc-def").isFalse();
    // same deal for explicit v0
    assertMatchesConfigurationFromFilename("abc-def-v0", "abc-def-v1").isTrue();
    assertMatchesConfigurationFromFilename("abc-def-v1", "abc-def-v0").isFalse();
    // higher versions are better of course
    assertMatchesConfigurationFromFilename("abc-def-v1", "abc-def-v999").isTrue();
    assertMatchesConfigurationFromFilename("abc-def-v999", "abc-def-v1").isFalse();
  }

  @Test
  public void nonMatchingSpecifiersShouldNotMatchConfigurationFromFilename() {
    // same version
    assertMatchesConfigurationFromFilename("abc", "ghi").isFalse();
    assertMatchesConfigurationFromFilename("abc-v0", "ghi-v0").isFalse();
    assertMatchesConfigurationFromFilename("abc-v15", "ghi-v15").isFalse();
    // different version
    assertMatchesConfigurationFromFilename("abc", "ghi-v15").isFalse();
    assertMatchesConfigurationFromFilename("abc-v0", "ghi-v15").isFalse();
    assertMatchesConfigurationFromFilename("abc-v15", "ghi-v19").isFalse();
  }

  @CheckReturnValue
  private BooleanSubject assertMatchesConfigurationFromFilename(
      String flagConfiguration, String fileConfiguration) {
    return assertWithMessage(
            "The split flag '%s' would be a match for a filename containing '%s'",
            flagConfiguration, fileConfiguration)
        .that(
            ResourceConfiguration.fromString(flagConfiguration)
                .matchesConfigurationFromFilename(
                    ResourceConfiguration.fromString(fileConfiguration)));
  }

  @Test
  public void resourceConfigurationShouldBeOrderedByApiVersionThenSpecifiers() {
    assertThat(
            ImmutableList.of(
                // -v0 and no -v0 sort equal given the same specifiers, so it's a tie
                ResourceConfiguration.fromString("a"),
                // version ties are broken based on lexicographic string ordering
                ResourceConfiguration.fromString("b-v0"),
                // string ordering ignores case of the specifiers
                ResourceConfiguration.fromString("Z"),
                // higher API versions sort later regardless of the specifiers
                ResourceConfiguration.fromString("z-v6"),
                ResourceConfiguration.fromString("b-v13"),
                // wildcards ("any") are ignored when considering specifier order
                ResourceConfiguration.fromString("any-c-v13")))
        .isStrictlyOrdered();

    // if they are actually equal, they will compare equal
    assertThat(ResourceConfiguration.fromString("c-v13"))
        .isEquivalentAccordingToCompareTo(ResourceConfiguration.fromString("c-v13"));

    // if the only difference is wildcards they will compare equal
    assertThat(ResourceConfiguration.fromString("any-c-v13"))
        .isEquivalentAccordingToCompareTo(ResourceConfiguration.fromString("c-v13"));

    // if the only difference is specifying (or not specifying) -v0 they will compare equal
    assertThat(ResourceConfiguration.fromString("a-v0"))
        .isEquivalentAccordingToCompareTo(ResourceConfiguration.fromString("a"));

    // if the only difference is case they will compare equal
    assertThat(ResourceConfiguration.fromString("z"))
        .isEquivalentAccordingToCompareTo(ResourceConfiguration.fromString("Z"));
  }

  @Test
  public void resourceConfigurationShouldPassEqualsTester() {
    new EqualsTester()
        .addEqualityGroup(
            // base example
            ResourceConfiguration.fromString("abc-def"),
            // identical clone
            ResourceConfiguration.fromString("abc-def"),
            // case doesn't matter
            ResourceConfiguration.fromString("aBC-dEF"),
            // absent version code is equivalent to -v0
            ResourceConfiguration.fromString("abc-def-v0"),
            // skip "any"
            ResourceConfiguration.fromString("any-abc-any-def-any"))
        .addEqualityGroup(
            // order matters
            ResourceConfiguration.fromString("def-abc"))
        .addEqualityGroup(
            // empty segments are not collapsed
            ResourceConfiguration.fromString("abc---def"))
        .addEqualityGroup(
            // different version codes are parsed but result in a non-equal instance
            ResourceConfiguration.fromString("abc-def-v15"))
        .addEqualityGroup(
            // two configurations with version codes must also have EQUAL version codes
            ResourceConfiguration.fromString("abc-def-v12"))
        .addEqualityGroup(
            // empty strings are equal
            ResourceConfiguration.fromString(""),
            // yes, even if they have a v0
            ResourceConfiguration.fromString("v0"),
            // or if there are some wildcards which will collapse to nothing
            ResourceConfiguration.fromString("any"),
            ResourceConfiguration.fromString("any-v0"),
            ResourceConfiguration.fromString("any-any-any"),
            ResourceConfiguration.fromString("any-any-any-v0"))
        .addEqualityGroup(
            // not if the version is nonzero though
            ResourceConfiguration.fromString("v15"), ResourceConfiguration.fromString("any-v15"))
        .testEquals();
  }
}