/*
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html.
 *
 * This file is a derivative of code released under the terms listed below.
 *
 */
/*
 * Copyright (c) 2009-2012,
 *
 * <p>Adam Fuchs <afuchs@cs.umd.edu> Avik Chaudhuri <avik@cs.umd.edu> Steve Suh <suhsteve@gmail.com>
 * Galois, Inc. (Adam Foltzer <acfoltzer@galois.com)
 *
 * <p>All rights reserved.
 *
 * <p>Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *
 * <p>1. Redistributions of source code must retain the above copyright notice, this list of
 * conditions and the following disclaimer.
 *
 * <p>2. Redistributions in binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other materials provided with
 * the distribution.
 *
 * <p>3. The names of the contributors may not be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * <p>THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
 * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.scandroid.util;

import com.google.common.collect.Queues;
import com.ibm.wala.classLoader.IClass;
import com.ibm.wala.classLoader.Language;
import com.ibm.wala.core.util.io.FileProvider;
import com.ibm.wala.core.util.strings.Atom;
import com.ibm.wala.core.util.warnings.Warnings;
import com.ibm.wala.dalvik.util.AndroidAnalysisScope;
import com.ibm.wala.ipa.callgraph.AnalysisOptions;
import com.ibm.wala.ipa.callgraph.AnalysisScope;
import com.ibm.wala.ipa.callgraph.ClassTargetSelector;
import com.ibm.wala.ipa.callgraph.ContextSelector;
import com.ibm.wala.ipa.callgraph.IAnalysisCacheView;
import com.ibm.wala.ipa.callgraph.MethodTargetSelector;
import com.ibm.wala.ipa.callgraph.impl.Util;
import com.ibm.wala.ipa.callgraph.propagation.SSAContextInterpreter;
import com.ibm.wala.ipa.callgraph.propagation.SSAPropagationCallGraphBuilder;
import com.ibm.wala.ipa.callgraph.propagation.cfa.ZeroXCFABuilder;
import com.ibm.wala.ipa.callgraph.propagation.cfa.ZeroXInstanceKeys;
import com.ibm.wala.ipa.cha.ClassHierarchy;
import com.ibm.wala.ipa.cha.ClassHierarchyException;
import com.ibm.wala.ipa.cha.ClassHierarchyFactory;
import com.ibm.wala.ipa.cha.IClassHierarchy;
import com.ibm.wala.ipa.summaries.BypassClassTargetSelector;
import com.ibm.wala.ipa.summaries.BypassMethodTargetSelector;
import com.ibm.wala.ipa.summaries.MethodSummary;
import com.ibm.wala.ipa.summaries.XMLMethodSummaryReader;
import com.ibm.wala.types.MethodReference;
import com.ibm.wala.types.TypeReference;
import com.ibm.wala.util.collections.HashMapFactory;
import com.ibm.wala.util.collections.HashSetFactory;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collection;
import java.util.Deque;
import java.util.Map;
import java.util.Set;

public class AndroidAnalysisContext {
  private static final String methodSpec = "MethodSummaries.xml";
  private static final String pathToSpec = "data";

  private final ISCanDroidOptions options;
  private final AnalysisScope scope;
  private final ClassHierarchy cha;

  public AndroidAnalysisContext() {
    throw new IllegalArgumentException();
  }

  public AndroidAnalysisContext(ISCanDroidOptions options)
      throws IllegalArgumentException, ClassHierarchyException, IOException {
    this(options, "Java60RegressionExclusions.txt");
  }

  public AndroidAnalysisContext(ISCanDroidOptions options, String exclusions)
      throws IOException, IllegalArgumentException, ClassHierarchyException {

    this.options = options;
    scope =
        AndroidAnalysisScope.setUpAndroidAnalysisScope(
            options.getClasspath(),
            exclusions,
            getClass().getClassLoader(),
            options.getAndroidLibrary());

    cha = ClassHierarchyFactory.make(scope);

    /*
    if (options.classHierarchyWarnings()) {
    	// log ClassHierarchy warnings
    	for (Warning w : Iterator2Iterable.make(Warnings.iterator())) {

    	}
    }
    */
    Warnings.clear();
  }

  public static SSAPropagationCallGraphBuilder makeVanillaZeroOneCFABuilder(
      AnalysisOptions options,
      IAnalysisCacheView cache,
      IClassHierarchy cha,
      AnalysisScope scope,
      ContextSelector customSelector,
      SSAContextInterpreter customInterpreter,
      InputStream summariesStream,
      MethodSummary extraSummary) {

    if (options == null) {
      throw new IllegalArgumentException("options is null");
    }
    Util.addDefaultSelectors(options, cha);
    // addDefaultBypassLogic(options, scope, Util.class.getClassLoader(),
    // cha);
    // addBypassLogic(options, scope,
    // AndroidAppLoader.class.getClassLoader(), methodSpec, cha);
    addBypassLogic(options, scope, summariesStream, cha, extraSummary);

    return ZeroXCFABuilder.make(
        Language.JAVA,
        cha,
        options,
        cache,
        customSelector,
        customInterpreter,
        ZeroXInstanceKeys.ALLOCATIONS | ZeroXInstanceKeys.CONSTANT_SPECIFIC);
  }

  /**
   * @param options options that govern call graph construction
   * @param cha governing class hierarchy
   * @param scope representation of the analysis scope
   * @param customSelector user-defined context selector, or null if none
   * @param customInterpreter user-defined context interpreter, or null if none
   * @return a 0-CFA Call Graph Builder.
   * @throws IllegalArgumentException if options is null
   *     <p>TODO: move
   */
  public static SSAPropagationCallGraphBuilder makeZeroCFABuilder(
      AnalysisOptions options,
      IAnalysisCacheView cache,
      IClassHierarchy cha,
      AnalysisScope scope,
      ContextSelector customSelector,
      SSAContextInterpreter customInterpreter,
      Collection<InputStream> summariesStreams,
      MethodSummary extraSummary) {

    if (options == null) {
      throw new IllegalArgumentException("options is null");
    }
    Util.addDefaultSelectors(options, cha);
    for (InputStream stream : summariesStreams) {
      addBypassLogic(options, scope, stream, cha, extraSummary);
    }

    return ZeroXCFABuilder.make(
        Language.JAVA,
        cha,
        options,
        cache,
        customSelector,
        customInterpreter,
        ZeroXInstanceKeys.NONE);
  }

  // public static void addBypassLogic(AnalysisOptions options, AnalysisScope
  // scope, ClassLoader cl, String xmlFile,
  // IClassHierarchy cha) throws IllegalArgumentException {
  public static void addBypassLogic(
      AnalysisOptions options,
      AnalysisScope scope,
      InputStream xmlIStream,
      IClassHierarchy cha,
      MethodSummary extraSummary)
      throws IllegalArgumentException {

    if (scope == null) {
      throw new IllegalArgumentException("scope is null");
    }
    if (options == null) {
      throw new IllegalArgumentException("options is null");
    }
    // if (cl == null) {
    // throw new IllegalArgumentException("cl is null");
    // }
    if (cha == null) {
      throw new IllegalArgumentException("cha cannot be null");
    }

    try {
      Set<TypeReference> summaryClasses = HashSetFactory.make();
      Map<MethodReference, MethodSummary> summaries = HashMapFactory.make();

      if (null != xmlIStream) {
        XMLMethodSummaryReader newSummaryXML = loadMethodSummaries(scope, xmlIStream);
        summaryClasses.addAll(newSummaryXML.getAllocatableClasses());
        summaries.putAll(newSummaryXML.getSummaries());
      }
      // for (MethodReference mr : summaries.keySet()) {
      //
      // }

      try (final InputStream s =
          new FileProvider()
              .getInputStreamFromClassLoader(
                  pathToSpec + File.separator + methodSpec,
                  AndroidAnalysisContext.class.getClassLoader())) {

        XMLMethodSummaryReader nativeSummaries = loadMethodSummaries(scope, s);

        summaries.putAll(nativeSummaries.getSummaries());
        summaryClasses.addAll(nativeSummaries.getAllocatableClasses());
        if (extraSummary != null) {
          summaries.put(extraSummary.getMethod(), extraSummary);
        }

        MethodTargetSelector ms =
            new BypassMethodTargetSelector(
                options.getMethodTargetSelector(), summaries,
                nativeSummaries.getIgnoredPackages(), cha);
        options.setSelector(ms);

        ClassTargetSelector cs =
            new BypassClassTargetSelector(
                options.getClassTargetSelector(),
                summaryClasses,
                cha,
                cha.getLoader(scope.getLoader(Atom.findOrCreateUnicodeAtom("Synthetic"))));
        options.setSelector(cs);
      }
    } catch (IOException e) {
      e.printStackTrace();
    }
  }

  private static XMLMethodSummaryReader loadMethodSummaries(
      AnalysisScope scope, InputStream xmlIStream) {
    try (@SuppressWarnings("resource")
        InputStream s =
            xmlIStream != null
                ? xmlIStream
                : AndroidAnalysisContext.class
                    .getClassLoader()
                    .getResourceAsStream(pathToSpec + File.separator + methodSpec)) {
      return new XMLMethodSummaryReader(s, scope);
    } catch (IOException e) {
      e.printStackTrace();
    }
    return null;
  }

  /** Returns all concrete classes implementing the given interface or any subinterfaces */
  public Collection<IClass> concreteClassesForInterface(IClass iRoot) {
    Set<IClass> clazzes = HashSetFactory.make();
    Set<IClass> done = HashSetFactory.make();
    Deque<IClass> todo = Queues.newArrayDeque();
    todo.push(iRoot);

    while (!todo.isEmpty()) {
      IClass i = todo.pop();
      for (IClass clazz : cha.getImplementors(i.getReference())) {
        if (clazz.isInterface() && !done.contains(clazz)) {
          done.add(i);
          todo.push(clazz);
        } else if (!clazz.isAbstract()) {
          clazzes.add(clazz);
        }
      }
    }

    return clazzes;
  }

  public ISCanDroidOptions getOptions() {
    return options;
  }

  public AnalysisScope getScope() {
    return scope;
  }

  public ClassHierarchy getClassHierarchy() {
    return cha;
  }
}
