// Copyright (C) 2020 The Android Open Source Project
//
// 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.gerrit.acceptance;

import static com.google.gerrit.sshd.CommandMetaData.Mode.MASTER_OR_SLAVE;
import static java.nio.charset.StandardCharsets.UTF_8;

import com.google.common.collect.Lists;
import com.google.gerrit.extensions.annotations.Exports;
import com.google.gerrit.json.OutputFormat;
import com.google.gerrit.server.DynamicOptions;
import com.google.gerrit.sshd.CommandMetaData;
import com.google.gerrit.sshd.CommandModule;
import com.google.gerrit.sshd.SshCommand;
import com.google.gson.reflect.TypeToken;
import com.google.inject.AbstractModule;
import com.google.inject.Inject;
import java.io.BufferedWriter;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.Collections;
import java.util.List;

public class AbstractDynamicOptionsTest extends AbstractDaemonTest {
  protected static final String LS_SAMPLES = "ls-samples";

  protected interface Bean {
    void setSamples(List<String> samples);
  }

  protected static class ListSamples implements Bean, DynamicOptions.BeanReceiver {
    protected List<String> samples = Collections.emptyList();

    @Override
    public void setSamples(List<String> samples) {
      this.samples = samples;
    }

    public void display(OutputStream displayOutputStream) throws Exception {
      PrintWriter stdout =
          new PrintWriter(new BufferedWriter(new OutputStreamWriter(displayOutputStream, UTF_8)));
      try {
        OutputFormat.JSON
            .newGson()
            .toJson(samples, new TypeToken<List<String>>() {}.getType(), stdout);
        stdout.print('\n');
      } finally {
        stdout.flush();
      }
    }

    @Override
    public void setDynamicBean(String plugin, DynamicOptions.DynamicBean dynamicBean) {}
  }

  @CommandMetaData(name = LS_SAMPLES, runsAt = MASTER_OR_SLAVE)
  protected static class ListSamplesCommand extends SshCommand {
    @Inject private ListSamples impl;

    @Override
    protected void run() throws Exception {
      impl.display(out);
    }

    @Override
    protected void parseCommandLine(DynamicOptions pluginOptions) throws UnloggedFailure {
      parseCommandLine(impl, pluginOptions);
    }
  }

  public static class PluginOneSshModule extends CommandModule {
    @Override
    public void configure() {
      command(LS_SAMPLES).to(ListSamplesCommand.class);
    }
  }

  protected static class ListSamplesOptions implements DynamicOptions.BeanParseListener {
    @Override
    public void onBeanParseStart(String plugin, Object bean) {
      ((Bean) bean).setSamples(Lists.newArrayList("sample1", "sample2"));
    }

    @Override
    public void onBeanParseEnd(String plugin, Object bean) {}
  }

  protected static class PluginTwoModule extends AbstractModule {
    @Override
    public void configure() {
      bind(DynamicOptions.DynamicBean.class)
          .annotatedWith(
              Exports.named("com.google.gerrit.acceptance.AbstractDynamicOptionsTest.ListSamples"))
          .to(ListSamplesOptionsClassNameProvider.class);
    }
  }

  protected static class ListSamplesOptionsClassNameProvider
      implements DynamicOptions.ClassNameProvider {
    @Override
    public String getClassName() {
      return "com.google.gerrit.acceptance.AbstractDynamicOptionsTest$ListSamplesOptions";
    }
  }
}