/*
    * Grapht, an open source dependency injector.
    * Copyright 2014-2015 various contributors (see CONTRIBUTORS.txt)
    * Copyright 2010-2014 Regents of the University of Minnesota
    *
    * This program is free software; you can redistribute it and/or modify
    * it under the terms of the GNU Lesser General Public License as
    * published by the Free Software Foundation; either version 2.1 of the
    * License, or (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
   * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
   * details.
   *
   * You should have received a copy of the GNU General Public License along with
   * this program; if not, write to the Free Software Foundation, Inc., 51
   * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
   */
  package org.grouplens.grapht;
  
  import org.apache.commons.lang3.tuple.Pair;
  import org.grouplens.grapht.reflect.Desire;
  import org.grouplens.grapht.reflect.InjectionPoint;
  import org.grouplens.grapht.reflect.Satisfaction;
  import org.grouplens.grapht.solver.DesireChain;
  import org.grouplens.grapht.solver.InjectionContext;
  import org.grouplens.grapht.solver.SolverException;
  
  /**
   * Exception thrown when there is a dependency resolution error.
   *
   * @since 0.9
   * @author <a href="http://grouplens.org">GroupLens Research</a>
   */
  @SuppressWarnings("deprecation")
  public class ResolutionException extends SolverException {
      private static final long serialVersionUID = 1L;
  
      public ResolutionException() {
          super();
      }
  
      public ResolutionException(String msg) {
          super(msg);
      }
  
      public ResolutionException(Throwable throwable) {
          super(throwable);
      }
  
      public ResolutionException(String msg, Throwable throwable) {
          super(msg, throwable);
      }
      
      protected String format(InjectionContext ctx, DesireChain desires) {
          StringBuilder sb = new StringBuilder();
          
          // type path
          sb.append("Context:\n");
          sb.append("  Type path:\n");
          for (Pair<Satisfaction, InjectionPoint> path: ctx) {
              Satisfaction sat = path.getLeft();
              Class<?> type = sat == null ? null : sat.getErasedType();
              sb.append("    ")
                .append(format(path.getRight(), type))
                .append('\n');
          }
          sb.append('\n');
          
          // desire chain
          sb.append("  Prior desires:\n");
          for (Desire desire: desires.getPreviousDesires()) {
              sb.append("    ")
                .append(format(desire.getInjectionPoint(), desire.getDesiredType()))
                .append('\n');
          }
  
          return sb.toString();
      }
  
      protected String format(InjectionPoint ip) {
          return format(ip, ip.getErasedType());
      }
  
      protected String format(InjectionPoint ip, Class<?> type) {
          if (type == null) {
              type = ip.getErasedType();
          }
          String base = (ip.getQualifier() != null ? ip.getQualifier() + ":" : "");
          String name = type == null ? null : type.getName();
          return base + name;
      }
  }