// 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.lib.rules.android;

import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.actions.ParamFileInfo;
import com.google.devtools.build.lib.actions.ParameterFile.ParameterFileType;
import com.google.devtools.build.lib.analysis.RuleContext;
import com.google.devtools.build.lib.analysis.actions.CustomCommandLine;
import com.google.devtools.build.lib.analysis.actions.CustomCommandLine.VectorArg;
import com.google.devtools.build.lib.analysis.actions.SpawnAction;
import com.google.devtools.build.lib.analysis.configuredtargets.RuleConfiguredTarget.Mode;
import com.google.devtools.build.lib.collect.nestedset.NestedSet;
import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
import com.google.devtools.build.lib.rules.android.AndroidConfiguration.AndroidAaptVersion;
import com.google.devtools.build.lib.rules.android.ResourceContainerConverter.ToArg;
import com.google.devtools.build.lib.rules.android.ResourceContainerConverter.ToArg.Includes;
import com.google.devtools.build.lib.util.OS;

/**
 * Builder for generating R classes for robolectric action.
 *
 * <p>This builder will create an action that generates r classes with internally consistent
 * resource ids for the transitive closure of dependencies that provide resources.
 */
public class RobolectricResourceSymbolsActionBuilder {

  private static final ResourceContainerConverter.ToArg RESOURCE_CONTAINER_TO_ARG =
      ResourceContainerConverter.builder()
          .include(Includes.ResourceRoots)
          .include(Includes.Manifest)
          .include(Includes.RTxt)
          .include(Includes.SymbolsBin)
          .withSeparator(ToArg.SeparatorType.COLON_COMMA)
          .toArgConverter();

  private static final ResourceContainerConverter.ToArg RESOURCE_CONTAINER_TO_AAPT2_ARG =
      ResourceContainerConverter.builder()
          .include(Includes.ResourceRoots)
          .include(Includes.Manifest)
          .include(Includes.Aapt2RTxt)
          .include(Includes.SymbolsBin)
          .withSeparator(ToArg.SeparatorType.COLON_COMMA)
          .toArgConverter();

  private Artifact classJarOut;
  private final ResourceDependencies dependencies;
  private AndroidSdkProvider sdk;
  private AndroidAaptVersion androidAaptVersion;

  private RobolectricResourceSymbolsActionBuilder(ResourceDependencies dependencies) {
    this.dependencies = dependencies;
  }

  public static RobolectricResourceSymbolsActionBuilder create(ResourceDependencies dependencies) {
    return new RobolectricResourceSymbolsActionBuilder(dependencies);
  }

  public RobolectricResourceSymbolsActionBuilder setJarOut(Artifact classJar) {
    this.classJarOut = classJar;
    return this;
  }

  public RobolectricResourceSymbolsActionBuilder setSdk(AndroidSdkProvider sdk) {
    this.sdk = sdk;
    return this;
  }

  public RobolectricResourceSymbolsActionBuilder targetAaptVersion(
      AndroidAaptVersion androidAaptVersion) {
    this.androidAaptVersion = androidAaptVersion;
    return this;
  }

  public NestedSet<Artifact> buildAsClassPathEntry(RuleContext ruleContext) {
    CustomCommandLine.Builder builder = new CustomCommandLine.Builder();
    // Set the busybox tool.
    builder.add("--tool").add("GENERATE_ROBOLECTRIC_R").add("--");

    NestedSetBuilder<Artifact> inputs = NestedSetBuilder.stableOrder();

    builder.addExecPath("--androidJar", sdk.getAndroidJar());
    inputs.add(sdk.getAndroidJar());

    ToArg resourceContainerToArg;

    if (androidAaptVersion == AndroidAaptVersion.AAPT2) {
      inputs.addTransitive(dependencies.getTransitiveAapt2RTxt());
      resourceContainerToArg = RESOURCE_CONTAINER_TO_AAPT2_ARG;
    } else {
      inputs.addTransitive(dependencies.getTransitiveRTxt());
      resourceContainerToArg = RESOURCE_CONTAINER_TO_ARG;
    }
    if (!Iterables.isEmpty(dependencies.getResourceContainers())) {
      builder.addAll(
          "--data",
          VectorArg.join(resourceContainerToArg.listSeparator())
              .each(dependencies.getResourceContainers())
              .mapped(resourceContainerToArg));
    }

    inputs
        .addTransitive(dependencies.getTransitiveResources())
        .addTransitive(dependencies.getTransitiveAssets())
        .addTransitive(dependencies.getTransitiveManifests())
        .addTransitive(dependencies.getTransitiveSymbolsBin());

    builder.addExecPath("--classJarOutput", classJarOut);
    builder.addLabel("--targetLabel", ruleContext.getLabel());

    SpawnAction.Builder spawnActionBuilder = new SpawnAction.Builder();

    ParamFileInfo.Builder paramFile = ParamFileInfo.builder(ParameterFileType.SHELL_QUOTED);
    // Some flags (e.g. --mainData) may specify lists (or lists of lists) separated by special
    // characters (colon, semicolon, hashmark, ampersand) that don't work on Windows, and quoting
    // semantics are very complicated (more so than in Bash), so let's just always use a parameter
    // file.
    // TODO(laszlocsomor), TODO(corysmith): restructure the Android BusyBux's flags by deprecating
    // list-type and list-of-list-type flags that use such problematic separators in favor of
    // multi-value flags (to remove one level of listing) and by changing all list separators to a
    // platform-safe character (= comma).
    paramFile.setUseAlways(OS.getCurrent() == OS.WINDOWS);

    ruleContext.registerAction(
        spawnActionBuilder
            .useDefaultShellEnvironment()
            .addTransitiveInputs(inputs.build())
            .addOutput(classJarOut)
            .addCommandLine(builder.build(), paramFile.build())
            .setExecutable(
                ruleContext.getExecutablePrerequisite("$android_resources_busybox", Mode.HOST))
            .setProgressMessage("Generating R classes for %s", ruleContext.getLabel())
            .setMnemonic("GenerateRobolectricRClasses")
            .build(ruleContext));

    return NestedSetBuilder.<Artifact>naiveLinkOrder().add(classJarOut).build();
  }
}
