/*
 * 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.idea.blaze.cpp;

import com.google.idea.blaze.base.async.process.ExternalTask;
import com.google.idea.blaze.base.model.primitives.WorkspaceRoot;
import com.intellij.openapi.diagnostic.Logger;
import java.io.ByteArrayOutputStream;
import java.io.File;

/** Runs a compiler to check its version. */
public class CompilerVersionCheckerImpl implements CompilerVersionChecker {

  private static final Logger logger = Logger.getInstance(CompilerVersionCheckerImpl.class);

  @Override
  public String checkCompilerVersion(WorkspaceRoot workspaceRoot, File cppExecutable) {
    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    ByteArrayOutputStream errStream = new ByteArrayOutputStream();
    int result =
        ExternalTask.builder(workspaceRoot)
            .args(cppExecutable.toString())
            // NOTE: this won't work with MSVC if we ever support that (check CToolchainIdeInfo?)
            .args("--version")
            .stdout(outputStream)
            .stderr(errStream)
            .build()
            .run();
    if (result != 0) {
      logger.warn(String.format("Error getting compiler version: \"%s\"", errStream));
      return null;
    }
    return outputStream.toString();
  }
}