/*
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * 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.facebook.buck.testutil;

import com.facebook.buck.util.Ansi;
import com.facebook.buck.util.CapturingPrintStream;
import com.facebook.buck.util.Console;
import com.facebook.buck.util.Verbosity;
import com.google.common.base.Charsets;

/**
 * Implementation of {@link Console} to use in unit tests. Avoids the side-effect of writing to
 * actual {@link System#out} or {@link System#err}, and makes it possible to inspect what was
 * written to either stream after the fact.
 */
public class TestConsole extends Console {

  public TestConsole() {
    this(Verbosity.STANDARD_INFORMATION);
  }

  public TestConsole(Verbosity verbosity) {
    super(
        verbosity,
        /* stdOut */ new CapturingPrintStream(),
        /* stdErr */ new CapturingPrintStream(),
        /* ansi */ Ansi.withoutTty());
  }

  public String getTextWrittenToStdOut() {
    CapturingPrintStream stream = (CapturingPrintStream) getStdOut().getRawStream();
    return stream.getContentsAsString(Charsets.UTF_8);
  }

  public String getTextWrittenToStdErr() {
    CapturingPrintStream stream = (CapturingPrintStream) getStdErr().getRawStream();
    return stream.getContentsAsString(Charsets.UTF_8);
  }
}
