/*
 * 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.ideinfo.RuleIdeInfo;
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.Label;
import com.google.idea.blaze.base.model.primitives.TargetExpression;
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.rulefinder.RuleFinder;
import com.google.idea.blaze.base.scope.BlazeContext;
import com.google.idea.blaze.base.run.processhandler.LineProcessingProcessAdapter;
import com.google.idea.blaze.base.run.processhandler.ScopedBlazeProcessHandler;
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 BlazeCommandRunProfileState 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 BlazeCommandRunProfileState(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(
      blazeCommand,
      workspaceRoot,
      new ScopedBlazeProcessHandler.ScopedProcessHandlerDelegate() {
        @Override
        public void onBlazeContextStart(BlazeContext context) {
          context
            .push(new LoggedTimingScope(project, Action.BLAZE_COMMAND_USAGE))
            .push(new IssuesScope(project))
          ;
        }

        @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) {

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

    if (debug) {
      boolean isJavaBinary = false;
      TargetExpression targetExpression = configuration.getTarget();
      if (targetExpression instanceof Label) {
        RuleIdeInfo rule = RuleFinder.getInstance().ruleForTarget(configuration.getProject(), (Label)targetExpression);
        if (rule != null && (rule.kind == Kind.JAVA_BINARY)) {
          isJavaBinary = true;
        }
      }

      if (isJavaBinary) {
        command.addExeFlags(BlazeFlags.JAVA_BINARY_DEBUG);
      } else {
        command.addBlazeFlags(BlazeFlags.JAVA_TEST_DEBUG);
      }

    }

    command.addExeFlags(configuration.getAllExeFlags());
    return command.build();
  }
}