/*
 * 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.base.run;

import com.google.common.collect.Sets;
import com.google.idea.blaze.base.ideinfo.RuleIdeInfo;
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.BlazeProjectData;
import com.google.idea.blaze.base.projectview.ProjectViewSet;
import com.google.idea.blaze.base.projectview.section.sections.TargetSection;
import com.google.idea.blaze.base.settings.BlazeImportSettings;
import com.google.idea.blaze.base.sync.projectview.WorkspaceLanguageSettings;
import com.google.idea.blaze.base.sync.SyncListener;
import com.intellij.execution.RunManager;
import com.intellij.execution.RunnerAndConfigurationSettings;
import com.intellij.execution.configurations.RunConfiguration;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.project.Project;
import com.intellij.util.ui.UIUtil;

import java.util.List;
import java.util.Set;

/**
 * Creates run configurations for modules imported from
 * {@link com.android.builder.model.AndroidProject}s.
 */
public class BlazeRunConfigurationSyncListener implements SyncListener {
  private static Logger log = Logger.getInstance(BlazeRunConfigurationSyncListener.class);

  @Override
  public void onSyncStart(Project project) {
  }

  @Override
  public void afterSync(Project project,
                        boolean successful) {
  }

  @Override
  public void onSyncComplete(
    Project project,
    BlazeImportSettings importSettings,
    ProjectViewSet projectViewSet,
    BlazeProjectData blazeProjectData) {

    UIUtil.invokeAndWaitIfNeeded((Runnable)() -> {
      Set<Label> labelsWithConfigs = labelsWithConfigs(project);
      Set<TargetExpression> targetExpressions = Sets.newHashSet(projectViewSet.listItems(TargetSection.KEY));
      for (RuleIdeInfo rule : blazeProjectData.ruleMap.values()) {
        maybeAddRunConfiguration(project, blazeProjectData.workspaceLanguageSettings, targetExpressions, labelsWithConfigs, rule);
      }
    });
  }

  /** Collects a set of all the Blaze labels that have an associated run configuration. */
  private static Set<Label> labelsWithConfigs(Project project) {
    List<RunConfiguration> configurations =
      RunManager.getInstance(project).getAllConfigurationsList();
    Set<Label> labelsWithConfigs = Sets.newHashSet();
    for (RunConfiguration configuration : configurations) {
      if (configuration instanceof BlazeRunConfiguration) {
        BlazeRunConfiguration blazeRunConfiguration =
          (BlazeRunConfiguration) configuration;
        TargetExpression target = blazeRunConfiguration.getTarget();
        if (target instanceof Label) {
          labelsWithConfigs.add((Label)target);
        }
      }
    }
    return labelsWithConfigs;
  }

  /**
   * Adds a run configuration for an android_binary target if there is not already a configuration
   * for that target.
   */
  private static void maybeAddRunConfiguration(
    Project project,
    WorkspaceLanguageSettings workspaceLanguageSettings,
    Set<TargetExpression> importTargets,
    Set<Label> labelsWithConfigs,
    RuleIdeInfo rule) {
    Label label = rule.label;
    // We only auto-generate configurations for rules listed in the project view.
    if (!importTargets.contains(label) ||
        labelsWithConfigs.contains(label)) {
      return;
    }
    labelsWithConfigs.add(label);
    final RunManager runManager = RunManager.getInstance(project);

    for (BlazeRuleConfigurationFactory configurationFactory : BlazeRuleConfigurationFactory.EP_NAME.getExtensions()) {
      if (configurationFactory.handlesRule(workspaceLanguageSettings, rule)) {
        final RunnerAndConfigurationSettings settings = configurationFactory.createForRule(runManager, rule);
        runManager.addConfiguration(settings, false /* isShared */);
        if (runManager.getSelectedConfiguration() == null) {
          // TODO(joshgiles): Better strategy for picking initially selected config.
          runManager.setSelectedConfiguration(settings);
        }
        break;
      }
    }
  }
}