/*
 * Copyright 2016 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.java.run;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableList;
import com.google.idea.blaze.base.async.process.LineProcessingOutputStream;
import com.google.idea.blaze.base.command.BlazeCommand;
import com.google.idea.blaze.base.command.BlazeCommandName;
import com.google.idea.blaze.base.command.BlazeFlags;
import com.google.idea.blaze.base.issueparser.IssueOutputLineProcessor;
import com.google.idea.blaze.base.metrics.Action;
import com.google.idea.blaze.base.model.primitives.Kind;
import com.google.idea.blaze.base.model.primitives.WorkspaceRoot;
import com.google.idea.blaze.base.projectview.ProjectViewManager;
import com.google.idea.blaze.base.projectview.ProjectViewSet;
import com.google.idea.blaze.base.run.BlazeCommandRunConfiguration;
import com.google.idea.blaze.base.run.processhandler.LineProcessingProcessAdapter;
import com.google.idea.blaze.base.run.processhandler.ScopedBlazeProcessHandler;
import com.google.idea.blaze.base.run.state.BlazeCommandRunConfigurationCommonState;
import com.google.idea.blaze.base.scope.BlazeContext;
import com.google.idea.blaze.base.scope.scopes.IdeaLogScope;
import com.google.idea.blaze.base.scope.scopes.IssuesScope;
import com.google.idea.blaze.base.scope.scopes.LoggedTimingScope;
import com.google.idea.blaze.base.settings.Blaze;
import com.google.idea.blaze.base.settings.BlazeImportSettings;
import com.google.idea.blaze.base.settings.BlazeImportSettingsManager;
import com.intellij.execution.ExecutionException;
import com.intellij.execution.configurations.CommandLineState;
import com.intellij.execution.configurations.RemoteConnection;
import com.intellij.execution.configurations.RemoteState;
import com.intellij.execution.configurations.RunProfile;
import com.intellij.execution.process.ProcessHandler;
import com.intellij.execution.process.ProcessListener;
import com.intellij.execution.runners.ExecutionEnvironment;
import com.intellij.openapi.project.Project;

/**
 * A Blaze run configuration set up with a an executor, program runner, and other settings, ready to
 * be executed. This class creates a command line for Blaze and exposes debug connection information
 * when using a debug executor.
 */
final class BlazeJavaRunProfileState extends CommandLineState implements RemoteState {
  // Blaze seems to always use this port for --java_debug.
  // TODO(joshgiles): Look at manually identifying and setting port.
  private static final int DEBUG_PORT = 5005;
  private static final String DEBUG_HOST_NAME = "localhost";

  private final BlazeCommandRunConfiguration configuration;
  private final boolean debug;

  public BlazeJavaRunProfileState(ExecutionEnvironment environment, boolean debug) {
    super(environment);
    RunProfile runProfile = environment.getRunProfile();
    assert runProfile instanceof BlazeCommandRunConfiguration;
    configuration = (BlazeCommandRunConfiguration) runProfile;
    this.debug = debug;
  }

  @Override
  protected ProcessHandler startProcess() throws ExecutionException {
    Project project = configuration.getProject();
    BlazeImportSettings importSettings =
        BlazeImportSettingsManager.getInstance(project).getImportSettings();
    assert importSettings != null;

    ProjectViewSet projectViewSet = ProjectViewManager.getInstance(project).getProjectViewSet();
    assert projectViewSet != null;

    BlazeCommand blazeCommand = getBlazeCommand(project, configuration, projectViewSet, debug);
    WorkspaceRoot workspaceRoot = WorkspaceRoot.fromImportSettings(importSettings);
    return new ScopedBlazeProcessHandler(
        project,
        blazeCommand,
        workspaceRoot,
        new ScopedBlazeProcessHandler.ScopedProcessHandlerDelegate() {
          @Override
          public void onBlazeContextStart(BlazeContext context) {
            context
                .push(new LoggedTimingScope(project, Action.BLAZE_COMMAND_USAGE))
                .push(new IssuesScope(project))
                .push(new IdeaLogScope());
          }

          @Override
          public ImmutableList<ProcessListener> createProcessListeners(BlazeContext context) {
            LineProcessingOutputStream outputStream =
                LineProcessingOutputStream.of(
                    new IssueOutputLineProcessor(project, context, workspaceRoot));
            return ImmutableList.of(new LineProcessingProcessAdapter(outputStream));
          }
        });
  }

  @Override
  public RemoteConnection getRemoteConnection() {
    if (!debug) {
      return null;
    }
    return new RemoteConnection(
        true /* useSockets */,
        DEBUG_HOST_NAME,
        Integer.toString(DEBUG_PORT),
        false /* serverMode */);
  }

  @VisibleForTesting
  static BlazeCommand getBlazeCommand(
      Project project,
      BlazeCommandRunConfiguration configuration,
      ProjectViewSet projectViewSet,
      boolean debug) {

    BlazeCommandRunConfigurationCommonState handlerState =
        configuration.getHandlerStateIfType(BlazeCommandRunConfigurationCommonState.class);
    assert handlerState != null;

    BlazeCommandName blazeCommand = handlerState.getCommand();
    assert blazeCommand != null;
    BlazeCommand.Builder command =
        BlazeCommand.builder(Blaze.getBuildSystem(project), blazeCommand)
            .setBlazeBinary(handlerState.getBlazeBinary())
            .addTargets(configuration.getTarget())
            .addBlazeFlags(BlazeFlags.buildFlags(project, projectViewSet))
            .addBlazeFlags(handlerState.getBlazeFlags());

    if (debug) {
      Kind kind = configuration.getKindForTarget();
      boolean isJavaBinary = kind == Kind.JAVA_BINARY;
      if (isJavaBinary) {
        command.addExeFlags(BlazeFlags.JAVA_BINARY_DEBUG);
      } else {
        command.addBlazeFlags(BlazeFlags.JAVA_TEST_DEBUG);
      }
    }

    command.addExeFlags(handlerState.getExeFlags());
    return command.build();
  }
}