/*
 * Copyright 2003-2012 JetBrains s.r.o.
 *
 * 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 jetbrains.mps.idea.core.actions;

import com.intellij.codeInsight.daemon.QuickFixBundle;
import com.intellij.compiler.ModuleCompilerUtil;
import com.intellij.openapi.actionSystem.AnActionEvent;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.module.Module;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.roots.ModifiableRootModel;
import com.intellij.openapi.roots.ModuleRootManager;
import com.intellij.openapi.ui.Messages;
import com.intellij.openapi.util.Pair;
import jetbrains.mps.ide.actions.MPSCommonDataKeys;
import jetbrains.mps.ide.project.ProjectHelper;
import jetbrains.mps.idea.core.project.SolutionIdea;
import jetbrains.mps.project.dependency.VisibilityUtil;
import jetbrains.mps.smodel.IOperationContext;
import jetbrains.mps.workbench.action.BaseAction;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.jetbrains.mps.openapi.model.SModel;
import org.jetbrains.mps.openapi.model.SModelReference;
import org.jetbrains.mps.openapi.model.SNode;
import org.jetbrains.mps.openapi.model.SReference;
import org.jetbrains.mps.openapi.module.SModule;
import org.jetbrains.mps.openapi.module.SRepository;

import java.util.ArrayList;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class AddMissingDependencyAction extends BaseAction {

  protected static Logger log = LogManager.getLogger(AddMissingDependencyAction.class);

  public AddMissingDependencyAction() {
    super("Add Missing Dependency", "", null);
    this.setIsAlwaysVisible(false);
    this.setExecuteOutsideCommand(false);
  }


  @Override
  protected void doExecute(AnActionEvent e, Map<String, Object> params) {
    try {
      Project project = e.getProject();
      if (project == null) {
        return;
      }
      SNode curNode = e.getData(MPSCommonDataKeys.NODE);
      if (curNode == null) return;
      IOperationContext context = e.getData(MPSCommonDataKeys.OPERATION_CONTEXT);
      if (context == null) return;

      SModule dependentModule = context.getModule();
      if (!(dependentModule instanceof SolutionIdea)) return;
      final Module ideaDependentModule = ((SolutionIdea) dependentModule).getIdeaModule();

      final List<Module> ideaModulesToDependOn = new ArrayList<Module>();
      Set<Module> circularDependentModulesSet = new LinkedHashSet<Module>();
      SRepository repository = ProjectHelper.getProjectRepository(project);

      for (SReference ref : curNode.getReferences()) {
        SModelReference mref = ref.getTargetSModelReference();
        if (mref == null) continue;
        SModel model = mref.resolve(repository);
        if (model == null) continue;
        SModule moduleToDependOn = model.getModule();
        if (!(moduleToDependOn instanceof SolutionIdea)) continue;

        if (!VisibilityUtil.isVisible(dependentModule, moduleToDependOn)) {

          Module ideaModuleToDependOn = ((SolutionIdea) moduleToDependOn).getIdeaModule();

          ideaModulesToDependOn.add(ideaModuleToDependOn);

          Pair<Module, Module> circularModules = ModuleCompilerUtil.addingDependencyFormsCircularity(ideaDependentModule, ideaModuleToDependOn);
          if (circularModules != null) {
            circularDependentModulesSet.add(circularModules.getFirst());
            circularDependentModulesSet.add(circularModules.getSecond());
          }
        }
      }

      if (ideaModulesToDependOn.isEmpty()) return;

      if (!circularDependentModulesSet.isEmpty()) {
        StringBuilder message = new StringBuilder();
        message.append("Adding dependency on ");
        if (ideaModulesToDependOn.size() == 1) {
          message.append("module ");
        } else {
          message.append("modules ");
        }
        for (int i = 0; i != ideaModulesToDependOn.size() - 1; ++i) {
          message.append("'");
          message.append(ideaModulesToDependOn.get(i).getName());
          message.append("', ");
        }
        message.append("'");
        message.append(ideaModulesToDependOn.get(ideaModulesToDependOn.size() - 1).getName());
        message.append("'");
        message.append(" will introduce circular dependency between modules ");
        Module[] modules = circularDependentModulesSet.toArray(new Module[circularDependentModulesSet.size()]);
        for (int i = 0; i != modules.length - 1; ++i) {
          message.append("'");
          message.append(modules[i].getName());
          message.append("', ");
        }
        message.append("'");
        message.append(modules[modules.length - 1].getName());
        message.append("'");
        message.append(".\nAdd dependency anyway?");
        final String finalMessage = message.toString();
        if (ApplicationManager.getApplication().isUnitTestMode()) throw new RuntimeException(finalMessage);


        ApplicationManager.getApplication().invokeLater(new Runnable() {
          public void run() {
            Project project = ideaDependentModule.getProject();
            if (!(project.isOpen())) return;
            int ret = Messages.showOkCancelDialog(project, finalMessage,
              QuickFixBundle.message("orderEntry.fix.title.circular.dependency.warning"),
              Messages.getWarningIcon());
            if (ret == 0) {
              addDependency(ideaDependentModule, ideaModulesToDependOn);
            }
          }
        });
      } else {
        addDependency(ideaDependentModule, ideaModulesToDependOn);
      }

    } catch (Throwable t) {
      log.error("User's action execute method failed. Action:" + "AddMissingDependency", t);
    }

  }

  private void addDependency(final Module dependentModule, final List<Module> modulesToDependOn) {
    ApplicationManager.getApplication().runWriteAction(new Runnable() {
      @Override
      public void run() {
        final ModifiableRootModel model = ModuleRootManager.getInstance(dependentModule).getModifiableModel();
        for (Module moduleToDependOn : modulesToDependOn) {
          model.addModuleOrderEntry(moduleToDependOn);
        }
        model.commit();
      }
    });
  }

  @Override
  public void doUpdate(AnActionEvent e, Map<String, Object> params) {
    try {
      boolean enabled = isApplicable(e);
      this.setEnabledState(e.getPresentation(), enabled);
    } catch (Throwable t) {
      log.error("User's action doUpdate method failed. Action:" + "RenameMethod", t);
      this.disable(e.getPresentation());
    }
  }


  public boolean isApplicable(AnActionEvent e) {
    Project project = e.getProject();
    if (project == null) {
      return false;
    }
    SNode curNode = e.getData(MPSCommonDataKeys.NODE);
    if (curNode == null) {
      return false;
    }

    IOperationContext context = e.getData(MPSCommonDataKeys.OPERATION_CONTEXT);
    if (context == null) return false;

    SModule dependentModule = context.getModule();
    if (!(dependentModule instanceof SolutionIdea)) return false;

    SRepository repository = ProjectHelper.getProjectRepository(project);
    for (SReference ref : curNode.getReferences()) {
      SModelReference mref = ref.getTargetSModelReference();
      if (mref == null) continue;
      SModel model = mref.resolve(repository);
      if (model == null) continue;
      SModule moduleToDependOn = model.getModule();
      if (!(moduleToDependOn instanceof SolutionIdea)) continue;

      return !VisibilityUtil.isVisible(dependentModule, moduleToDependOn);
    }
    return false;
  }
}
