// Copyright (C) 2009 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.pgm;

import static com.google.gerrit.server.schema.DataSourceProvider.Context.SINGLE_USER;

import com.google.gerrit.extensions.config.FactoryModule;
import com.google.gerrit.lifecycle.LifecycleManager;
import com.google.gerrit.pgm.util.RuntimeShutdown;
import com.google.gerrit.pgm.util.SiteProgram;
import com.google.gerrit.sshd.commands.QueryShell;
import com.google.gerrit.sshd.commands.QueryShell.Factory;
import com.google.inject.Injector;

import org.kohsuke.args4j.Option;

import java.io.IOException;

/** Run Gerrit's SQL query tool */
public class Gsql extends SiteProgram {
  private final LifecycleManager manager = new LifecycleManager();
  private Injector dbInjector;

  @Option(name = "--format", usage = "Set output format")
  private QueryShell.OutputFormat format = QueryShell.OutputFormat.PRETTY;

  @Option(name = "-c", metaVar = "SQL QUERY", usage = "Query to execute")
  private String query;

  @Override
  public int run() throws Exception {
    mustHaveValidSite();

    dbInjector = createDbInjector(SINGLE_USER);
    manager.add(dbInjector);
    manager.start();
    RuntimeShutdown.add(new Runnable() {
      @Override
      public void run() {
        try {
          System.in.close();
        } catch (IOException e) {
          // Ignored
        }
        manager.stop();
      }
    });
    final QueryShell shell = shellFactory().create(System.in, System.out);
    shell.setOutputFormat(format);
    if (query != null) {
      shell.execute(query);
    } else {
      shell.run();
    }
    return 0;
  }

  private Factory shellFactory() {
    return dbInjector.createChildInjector(new FactoryModule() {
      @Override
      protected void configure() {
        factory(QueryShell.Factory.class);
      }
    }).getInstance(QueryShell.Factory.class);
  }
}