// Copyright 2014 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.bazel.rules;

import com.google.common.base.Supplier;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.analysis.BlazeDirectories;
import com.google.devtools.build.lib.analysis.ConfiguredRuleClassProvider;
import com.google.devtools.build.lib.bazel.rules.cpp.BazelCppRuleClasses;
import com.google.devtools.build.lib.query2.output.OutputFormatter;
import com.google.devtools.build.lib.rules.cpp.FdoSupportFunction;
import com.google.devtools.build.lib.rules.cpp.FdoSupportValue;
import com.google.devtools.build.lib.rules.genquery.GenQuery;
import com.google.devtools.build.lib.runtime.BlazeModule;
import com.google.devtools.build.lib.runtime.Command;
import com.google.devtools.build.lib.runtime.CommandEnvironment;
import com.google.devtools.build.lib.runtime.WorkspaceBuilder;
import com.google.devtools.build.lib.skyframe.PrecomputedValue;
import com.google.devtools.build.lib.util.ResourceFileLoader;

import java.io.IOException;

/**
 * Module implementing the rule set of Bazel.
 */
public class BazelRulesModule extends BlazeModule {

  private CommandEnvironment env;

  @Override
  public void beforeCommand(Command command, CommandEnvironment env) {
    this.env = env;
    env.getEventBus().register(this);
  }

  @Override
  public void afterCommand() {
    this.env = null;
  }

  @Override
  public void initializeRuleClasses(ConfiguredRuleClassProvider.Builder builder) {
    builder.setToolsRepository(BazelRuleClassProvider.TOOLS_REPOSITORY);
    BazelRuleClassProvider.setup(builder);
    try {
      // Load auto-configuration files, it is made outside of the rule class provider so that it
      // will not be loaded for our Java tests.
      builder.addWorkspaceFileSuffix(
          ResourceFileLoader.loadResource(BazelCppRuleClasses.class, "cc_configure.WORKSPACE"));
      builder.addWorkspaceFileSuffix(
          ResourceFileLoader.loadResource(BazelRulesModule.class, "xcode_configure.WORKSPACE"));
    } catch (IOException e) {
      throw new IllegalStateException(e);
    }
  }

  @Override
  public void workspaceInit(BlazeDirectories directories, WorkspaceBuilder builder) {
    builder.addSkyFunction(FdoSupportValue.SKYFUNCTION, new FdoSupportFunction());
    builder.addPrecomputedValue(PrecomputedValue.injected(
        GenQuery.QUERY_OUTPUT_FORMATTERS,
        new Supplier<ImmutableList<OutputFormatter>>() {
          @Override
          public ImmutableList<OutputFormatter> get() {
            return env.getRuntime().getQueryOutputFormatters();
          }
        }));
  }
}