// 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.analysis.platform;

import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;
import com.google.devtools.build.lib.events.Location;
import com.google.devtools.build.lib.packages.BuiltinProvider;
import com.google.devtools.build.lib.packages.NativeInfo;
import com.google.devtools.build.lib.skylarkbuildapi.platform.ToolchainInfoApi;
import com.google.devtools.build.lib.syntax.EvalException;
import com.google.devtools.build.lib.syntax.SkylarkDict;
import java.util.Map;

/**
 * A provider that supplies information about a specific language toolchain, including what platform
 * constraints are required for execution and for the target platform.
 */
@Immutable
public class ToolchainInfo extends NativeInfo implements ToolchainInfoApi {

  /** Name used in Skylark for accessing this provider. */
  public static final String SKYLARK_NAME = "ToolchainInfo";

  /** Provider singleton constant. */
  public static final BuiltinProvider<ToolchainInfo> PROVIDER = new Provider();

  /** Provider for {@link ToolchainInfo} objects. */
  private static class Provider extends BuiltinProvider<ToolchainInfo>
      implements ToolchainInfoApi.Provider {
    private Provider() {
      super(SKYLARK_NAME, ToolchainInfo.class);
    }

    @Override
    public ToolchainInfo toolchainInfo(SkylarkDict<?, ?> kwargs, Location loc)
        throws EvalException {
      Map<String, Object> data =
          SkylarkDict.castSkylarkDictOrNoneToDict(kwargs, String.class, Object.class, "data");
      return ToolchainInfo.create(data, loc);
    }
  }

  public ToolchainInfo(Map<String, Object> values, Location location) {
    super(PROVIDER, ImmutableMap.copyOf(values), location);
  }

  public static ToolchainInfo create(Map<String, Object> toolchainData) {
    return create(toolchainData, Location.BUILTIN);
  }

  public static ToolchainInfo create(Map<String, Object> toolchainData, Location loc) {
    return new ToolchainInfo(toolchainData, loc);
  }

  /** Add make variables to be exported to dependers. */
  public void addGlobalMakeVariables(ImmutableMap.Builder<String, String> globalMakeEnvBuilder) {}
}