/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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 org.apache.maven.model.building;
  
  import java.util.EnumSet;
  import java.util.List;
  import java.util.Set;
  
  import org.apache.maven.model.Model;
  import org.apache.maven.model.io.ModelParseException;
  
  /**
   * Collects problems that are encountered during model building. The primary purpose of this component is to account for
   * the fact that the problem reporter has/should not have information about the calling context and hence cannot provide
   * an expressive source hint for the model problem. Instead, the source hint is configured by the model builder before
   * it delegates to other components that potentially encounter problems. Then, the problem reporter can focus on
   * providing a simple error message, leaving the donkey work of creating a nice model problem to this component.
   *
   * @author Benjamin Bentmann
   */
  class DefaultModelProblemCollector implements ModelProblemCollectorExt {
  
      private final ModelBuildingResult result;
  
      private List<ModelProblem> problems;
  
      private String source;
  
      private Model sourceModel;
  
      private Model rootModel;
  
      private Set<ModelProblem.Severity> severities = EnumSet.noneOf(ModelProblem.Severity.class);
  
      DefaultModelProblemCollector(ModelBuildingResult result) {
          this.result = result;
          this.problems = result.getProblems();
  
          for (ModelProblem problem : this.problems) {
              severities.add(problem.getSeverity());
          }
      }
  
      public boolean hasFatalErrors() {
          return severities.contains(ModelProblem.Severity.FATAL);
      }
  
      public boolean hasErrors() {
          return severities.contains(ModelProblem.Severity.ERROR) || severities.contains(ModelProblem.Severity.FATAL);
      }
  
      @Override
      public List<ModelProblem> getProblems() {
          return problems;
      }
  
      public void setSource(String source) {
          this.source = source;
          this.sourceModel = null;
      }
  
      public void setSource(Model source) {
          this.sourceModel = source;
          this.source = null;
  
          if (rootModel == null) {
              rootModel = source;
          }
      }
  
      private String getSource() {
          if (source == null && sourceModel != null) {
              source = ModelProblemUtils.toPath(sourceModel);
          }
          return source;
      }
  
      private String getModelId() {
          return ModelProblemUtils.toId(sourceModel);
      }
  
      public void setRootModel(Model rootModel) {
          this.rootModel = rootModel;
     }
 
     public Model getRootModel() {
         return rootModel;
     }
 
     public String getRootModelId() {
         return ModelProblemUtils.toId(rootModel);
     }
 
     public void add(ModelProblem problem) {
         problems.add(problem);
 
         severities.add(problem.getSeverity());
     }
 
     public void addAll(List<ModelProblem> problems) {
         this.problems.addAll(problems);
 
         for (ModelProblem problem : problems) {
             severities.add(problem.getSeverity());
         }
     }
 
     @Override
     public void add(ModelProblemCollectorRequest req) {
         int line = -1;
         int column = -1;
         String source = null;
         String modelId = null;
 
         if (req.getLocation() != null) {
             line = req.getLocation().getLineNumber();
             column = req.getLocation().getColumnNumber();
             if (req.getLocation().getSource() != null) {
                 modelId = req.getLocation().getSource().getModelId();
                 source = req.getLocation().getSource().getLocation();
             }
         }
 
         if (modelId == null) {
             modelId = getModelId();
             source = getSource();
         }
 
         if (line <= 0 && column <= 0 && req.getException() instanceof ModelParseException) {
             ModelParseException e = (ModelParseException) req.getException();
             line = e.getLineNumber();
             column = e.getColumnNumber();
         }
 
         ModelProblem problem = new DefaultModelProblem(
                 req.getMessage(),
                 req.getSeverity(),
                 req.getVersion(),
                 source,
                 line,
                 column,
                 modelId,
                 req.getException());
 
         add(problem);
     }
 
     public ModelBuildingException newModelBuildingException() {
         ModelBuildingResult result = this.result;
         if (result.getModelIds().isEmpty()) {
             DefaultModelBuildingResult tmp = new DefaultModelBuildingResult();
             tmp.setEffectiveModel(result.getEffectiveModel());
             tmp.setProblems(getProblems());
             tmp.setActiveExternalProfiles(result.getActiveExternalProfiles());
             String id = getRootModelId();
             tmp.addModelId(id);
             tmp.setRawModel(id, getRootModel());
             result = tmp;
         }
         return new ModelBuildingException(result);
     }
 }