// Copyright 2012 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.testing.junit.runner.junit4;

import com.google.common.base.Optional;
import com.google.common.collect.ImmutableList;

import dagger.Module;
import dagger.Provides;

import java.nio.file.Path;

import javax.inject.Singleton;

/**
 * Dagger modules which hold state or are, for testing purposes, implemented with non-static
 * provider methods.  These types are collected here so they can be cleanly named in the
 * component builder, but still be obvious in module includes and component declarations.
 */
public final class JUnit4InstanceModules {

  /**
   * A stateful dagger module that holds the supplied test suite class.
   */
  @Module
  public static final class SuiteClass {
    private final Class<?> suiteClass;

    public SuiteClass(Class<?> suiteClass) {
      this.suiteClass = suiteClass;
    }

    @Provides
    @TopLevelSuite
    Class<?> topLevelSuite() {
      return suiteClass;
    }

    @Provides
    @TopLevelSuite
    static String topLevelSuiteName(@TopLevelSuite Class<?> suite) {
      return suite.getCanonicalName();
    }
  }

  /**
   * A module which supplies a JUnit4Config object, which can be overridden at test-time.
   */
  @Module
  public static final class Config {
    private final ImmutableList<String> args;

    /**
     * Creates a module that can provide a {@link JUnit4Config} from supplied command-line
     * arguments
     */
    public Config(String... args) {
      this.args = ImmutableList.copyOf(args);
    }

    @Provides
    @Singleton
    JUnit4Options options() {
      return JUnit4Options.parse(System.getenv(), ImmutableList.copyOf(args));
    }

    @Provides
    @Singleton
    JUnit4Config config(JUnit4Options options) {
      return new JUnit4Config(
          options.getTestIncludeFilter(), options.getTestExcludeFilter(), Optional.<Path>absent());
    }
  }

  private JUnit4InstanceModules() {}
}