/*
 * Copyright (C) 2010 Google Inc.
 *
 * 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.doclava;

import com.google.doclava.apicheck.ApiInfo;
import com.google.clearsilver.jsilver.data.Data;
import com.sun.javadoc.*;

import java.util.*;

public class PackageInfo extends DocInfo implements ContainerInfo {
  public static final String DEFAULT_PACKAGE = "default package";

  public static final Comparator<PackageInfo> comparator = new Comparator<PackageInfo>() {
    public int compare(PackageInfo a, PackageInfo b) {
      return a.name().compareTo(b.name());
    }
  };

  public PackageInfo(PackageDoc pkg, String name, SourcePositionInfo position) {
    super(pkg.getRawCommentText(), position);
    if (name.isEmpty()) {
      mName = DEFAULT_PACKAGE;
    } else {
      mName = name;
    }

    mPackage = pkg;
    initializeMaps();
  }

  public PackageInfo(String name) {
    super("", null);
    mName = name;
    initializeMaps();
  }

  public PackageInfo(String name, SourcePositionInfo position) {
    super("", position);

    if (name.isEmpty()) {
      mName = "default package";
    } else {
      mName = name;
    }
    initializeMaps();
  }

  private void initializeMaps() {
      mAnnotationsMap = new HashMap<String, ClassInfo>();
      mInterfacesMap = new HashMap<String, ClassInfo>();
      mOrdinaryClassesMap = new HashMap<String, ClassInfo>();
      mEnumsMap = new HashMap<String, ClassInfo>();
      mExceptionsMap = new HashMap<String, ClassInfo>();
      mErrorsMap = new HashMap<String, ClassInfo>();
  }

  public String htmlPage() {
    String s = mName;
    s = s.replace('.', '/');
    s += "/package-summary.html";
    s = Doclava.javadocDir + s;
    return s;
  }

  @Override
  public ContainerInfo parent() {
    return null;
  }

  @Override
  public boolean isHidden() {
    if (mHidden == null) {
      if (hasHideComment()) {
        // We change the hidden value of the package if a class wants to be not hidden.
        ClassInfo[][] types = new ClassInfo[][] { annotations(), interfaces(), ordinaryClasses(),
            enums(), exceptions() };
        for (ClassInfo[] type : types) {
          if (type != null) {
            for (ClassInfo c : type) {
              if (c.hasShowAnnotation()) {
                mHidden = false;
                return false;
              }
            }
          }
        }
        mHidden = true;
      } else {
        mHidden = false;
      }
    }
    return mHidden;
  }

  @Override
  public boolean isRemoved() {
    if (mRemoved == null) {
      if (hasRemovedComment()) {
        // We change the removed value of the package if a class wants to be not hidden.
        ClassInfo[][] types = new ClassInfo[][] { annotations(), interfaces(), ordinaryClasses(),
            enums(), exceptions() };
        for (ClassInfo[] type : types) {
          if (type != null) {
            for (ClassInfo c : type) {
              if (c.hasShowAnnotation()) {
                mRemoved = false;
                return false;
              }
            }
          }
        }
        mRemoved = true;
      } else {
        mRemoved = false;
      }
    }

    return mRemoved;
  }

  @Override
  public boolean isHiddenOrRemoved() {
    return isHidden() || isRemoved();
  }

  /**
   * Used by ClassInfo to determine packages default visability before annoations.
   */
  public boolean hasHideComment() {
    if (mHiddenByComment == null) {
      if (Doclava.hiddenPackages.contains(mName)) {
        mHiddenByComment = true;
      } else {
        mHiddenByComment = comment().isHidden();
      }
    }
    return mHiddenByComment;
  }

  public boolean hasRemovedComment() {
    if (mRemovedByComment == null) {
      mRemovedByComment = comment().isRemoved();
    }

    return mRemovedByComment;
  }

  public boolean checkLevel() {
    // TODO should return false if all classes are hidden but the package isn't.
    // We don't have this so I'm not doing it now.
    return !isHiddenOrRemoved();
  }

  public String name() {
    return mName;
  }

  public String qualifiedName() {
    return mName;
  }

  public TagInfo[] inlineTags() {
    return comment().tags();
  }

  public TagInfo[] firstSentenceTags() {
    return comment().briefTags();
  }

  /**
   * @param classes the Array of ClassInfo to be filtered
   * @return an Array of ClassInfo without any hidden or removed classes
   */
  public static ClassInfo[] filterHiddenAndRemoved(ClassInfo[] classes) {
    ArrayList<ClassInfo> out = new ArrayList<ClassInfo>();

    for (ClassInfo cl : classes) {
      if (!cl.isHiddenOrRemoved()) {
        out.add(cl);
      }
    }

    return out.toArray(new ClassInfo[0]);
  }

  public void makeLink(Data data, String base) {
    if (checkLevel()) {
      data.setValue(base + ".link", htmlPage());
    }
    data.setValue(base + ".name", name());
    data.setValue(base + ".since", getSince());
  }

  public void makeClassLinkListHDF(Data data, String base) {
    makeLink(data, base);
    ClassInfo.makeLinkListHDF(data, base + ".annotations", annotations());
    ClassInfo.makeLinkListHDF(data, base + ".interfaces", interfaces());
    ClassInfo.makeLinkListHDF(data, base + ".classes", ordinaryClasses());
    ClassInfo.makeLinkListHDF(data, base + ".enums", enums());
    ClassInfo.makeLinkListHDF(data, base + ".exceptions", exceptions());
    ClassInfo.makeLinkListHDF(data, base + ".errors", errors());
    data.setValue(base + ".since", getSince());
  }

  public ClassInfo[] annotations() {
    if (mAnnotations == null) {
      mAnnotations =
          ClassInfo.sortByName(filterHiddenAndRemoved(
              Converter.convertClasses(mPackage.annotationTypes())));
    }
    return mAnnotations;
  }

  public ClassInfo[] interfaces() {
    if (mInterfaces == null) {
      mInterfaces =
          ClassInfo.sortByName(filterHiddenAndRemoved(
              Converter.convertClasses(mPackage.interfaces())));
    }
    return mInterfaces;
  }

  public ClassInfo[] ordinaryClasses() {
    if (mOrdinaryClasses == null) {
      mOrdinaryClasses =
          ClassInfo.sortByName(filterHiddenAndRemoved(
              Converter.convertClasses(mPackage.ordinaryClasses())));
    }
    return mOrdinaryClasses;
  }

  public ClassInfo[] enums() {
    if (mEnums == null) {
      mEnums = ClassInfo.sortByName(filterHiddenAndRemoved(
          Converter.convertClasses(mPackage.enums())));
    }
    return mEnums;
  }

  public ClassInfo[] exceptions() {
    if (mExceptions == null) {
      mExceptions =
          ClassInfo.sortByName(filterHiddenAndRemoved(
              Converter.convertClasses(mPackage.exceptions())));
    }
    return mExceptions;
  }

  public ClassInfo[] errors() {
    if (mErrors == null) {
      mErrors = ClassInfo.sortByName(filterHiddenAndRemoved(
          Converter.convertClasses(mPackage.errors())));
    }
    return mErrors;
  }

  public ApiInfo containingApi() {
    return mContainingApi;
  }

  public void setContainingApi(ApiInfo api) {
    mContainingApi = api;
  }

  // in hashed containers, treat the name as the key
  @Override
  public int hashCode() {
    return mName.hashCode();
  }

  private Boolean mHidden = null;
  private Boolean mHiddenByComment = null;
  private Boolean mRemoved = null;
  private Boolean mRemovedByComment = null;
  private String mName;
  private PackageDoc mPackage;
  private ApiInfo mContainingApi;
  private ClassInfo[] mAnnotations;
  private ClassInfo[] mInterfaces;
  private ClassInfo[] mOrdinaryClasses;
  private ClassInfo[] mEnums;
  private ClassInfo[] mExceptions;
  private ClassInfo[] mErrors;

  private HashMap<String, ClassInfo> mAnnotationsMap;
  private HashMap<String, ClassInfo> mInterfacesMap;
  private HashMap<String, ClassInfo> mOrdinaryClassesMap;
  private HashMap<String, ClassInfo> mEnumsMap;
  private HashMap<String, ClassInfo> mExceptionsMap;
  private HashMap<String, ClassInfo> mErrorsMap;


  public ClassInfo getClass(String className) {
      ClassInfo cls = mInterfacesMap.get(className);

      if (cls != null) {
          return cls;
      }

      cls = mOrdinaryClassesMap.get(className);

      if (cls != null) {
          return cls;
      }

      cls = mEnumsMap.get(className);

      if (cls != null) {
          return cls;
      }

      cls = mEnumsMap.get(className);

      if (cls != null) {
          return cls;
      }
      cls = mAnnotationsMap.get(className);

      if (cls != null) {
          return cls;
      }

      return mErrorsMap.get(className);
  }

  public void addAnnotation(ClassInfo cls) {
      cls.setPackage(this);
      mAnnotationsMap.put(cls.name(), cls);
  }

  public ClassInfo getAnnotation(String annotationName) {
      return mAnnotationsMap.get(annotationName);
  }

  public void addInterface(ClassInfo cls) {
      cls.setPackage(this);
      mInterfacesMap.put(cls.name(), cls);
  }

  public ClassInfo getInterface(String interfaceName) {
      return mInterfacesMap.get(interfaceName);
  }

  public ClassInfo getOrdinaryClass(String className) {
      return mOrdinaryClassesMap.get(className);
  }

  public void addOrdinaryClass(ClassInfo cls) {
      cls.setPackage(this);
      mOrdinaryClassesMap.put(cls.name(), cls);
  }

  public ClassInfo getEnum(String enumName) {
      return mEnumsMap.get(enumName);
  }

  public void addEnum(ClassInfo cls) {
      cls.setPackage(this);
      this.mEnumsMap.put(cls.name(), cls);
  }

  public ClassInfo getException(String exceptionName) {
      return mExceptionsMap.get(exceptionName);
  }

  public ClassInfo getError(String errorName) {
      return mErrorsMap.get(errorName);
  }

  // TODO: Leftovers from ApiCheck that should be better merged.
  private HashMap<String, ClassInfo> mClasses = new HashMap<String, ClassInfo>();

  public void addClass(ClassInfo cls) {
    cls.setPackage(this);
    mClasses.put(cls.name(), cls);
  }

  public HashMap<String, ClassInfo> allClasses() {
    return mClasses;
  }

  public boolean isConsistent(PackageInfo pInfo) {
    return isConsistent(pInfo, null);
  }

  /**
   * Creates the delta class by copying class signatures from original, but use provided list of
   * constructors and methods.
   */
  private ClassInfo createDeltaClass(ClassInfo original,
      ArrayList<MethodInfo> constructors, ArrayList<MethodInfo> methods) {
    ArrayList<FieldInfo> emptyFields = new ArrayList<>();
    ArrayList<ClassInfo> emptyClasses = new ArrayList<>();
    ArrayList<TypeInfo> emptyTypes = new ArrayList<>();
    ArrayList<MethodInfo> emptyMethods = new ArrayList<>();
    ClassInfo ret = new ClassInfo(null, original.getRawCommentText(), original.position(),
        original.isPublic(), original.isProtected(), original.isPackagePrivate(),
        original.isPrivate(), original.isStatic(), original.isInterface(),
        original.isAbstract(), original.isOrdinaryClass(),
        original.isException(), original.isError(), original.isEnum(), original.isAnnotation(),
        original.isFinal(), original.isIncluded(), original.name(), original.qualifiedName(),
        original.qualifiedTypeName(), original.isPrimitive());
    ArrayList<ClassInfo> interfaces = original.interfaces();
    // avoid providing null to init method, replace with empty array list when needed
    if (interfaces == null) {
      interfaces = emptyClasses;
    }
    ArrayList<TypeInfo> interfaceTypes = original.interfaceTypes();
    if (interfaceTypes == null) {
      interfaceTypes = emptyTypes;
    }
    ArrayList<ClassInfo> innerClasses = original.innerClasses();
    if (innerClasses == null) {
      innerClasses = emptyClasses;
    }
    ArrayList<MethodInfo> annotationElements = original.annotationElements();
    if (annotationElements == null) {
      annotationElements = emptyMethods;
    }
    ArrayList<AnnotationInstanceInfo> annotations = original.annotations();
    if (annotations == null) {
      annotations = new ArrayList<>();
    }
    ret.init(original.type(), interfaces, interfaceTypes, innerClasses,
        constructors, methods, annotationElements,
        emptyFields /* fields */, emptyFields /* enum */,
        original.containingPackage(), original.containingClass(), original.superclass(),
        original.superclassType(), annotations);
    return ret;
  }

  /**
   * Check if packages are consistent, also record class deltas.
   * <p>
   * <ul>class deltas are:
   * <li>brand new classes that are not present in current package
   * <li>stripped existing classes stripped where only newly added methods are kept
   * @param pInfo
   * @param clsInfoDiff
   * @return
   */
  public boolean isConsistent(PackageInfo pInfo, List<ClassInfo> clsInfoDiff) {
      return isConsistent(pInfo, clsInfoDiff, null);
  }

  /**
   * Check if packages are consistent, also record class deltas.
   * <p>
   * <ul>class deltas are:
   * <li>brand new classes that are not present in current package
   * <li>stripped existing classes stripped where only newly added methods are kept
   * @param pInfo
   * @param clsInfoDiff
   * @param ignoredClasses
   * @return
   */
  public boolean isConsistent(PackageInfo pInfo, List<ClassInfo> clsInfoDiff,
      Collection<String> ignoredClasses) {
    boolean consistent = true;
    boolean diffMode = clsInfoDiff != null;
    for (ClassInfo cInfo : mClasses.values()) {
      ArrayList<MethodInfo> newClsApis = null;
      ArrayList<MethodInfo> newClsCtors = null;

      // TODO: Add support for matching inner classes (e.g, something like
      //  example.Type.* should match example.Type.InnerType)
      if (ignoredClasses != null && ignoredClasses.contains(cInfo.qualifiedName())) {
          // TODO: Log skipping this?
          continue;
      }
      if (pInfo.mClasses.containsKey(cInfo.name())) {
        if (diffMode) {
          newClsApis = new ArrayList<>();
          newClsCtors = new ArrayList<>();
        }
        if (!cInfo.isConsistent(pInfo.mClasses.get(cInfo.name()), newClsCtors, newClsApis)) {
          consistent = false;
        }
        // if we are in diff mode, add class to list if there's new ctor or new apis
        if (diffMode && !(newClsCtors.isEmpty() && newClsApis.isEmpty())) {
          // generate a "delta" class with only added methods and constructors, but no fields etc
          ClassInfo deltaClsInfo = createDeltaClass(cInfo, newClsCtors, newClsApis);
          clsInfoDiff.add(deltaClsInfo);
        }
      } else {
        Errors.error(Errors.REMOVED_CLASS, cInfo.position(), "Removed public class "
            + cInfo.qualifiedName());
        consistent = false;
      }
    }
    for (ClassInfo cInfo : pInfo.mClasses.values()) {
      if (ignoredClasses != null && ignoredClasses.contains(cInfo.qualifiedName())) {
          // TODO: Log skipping this?
          continue;
      }
      if (!mClasses.containsKey(cInfo.name())) {
        Errors.error(Errors.ADDED_CLASS, cInfo.position(), "Added class " + cInfo.name()
            + " to package " + pInfo.name());
        consistent = false;
        // brand new class, add everything as is
        if (diffMode) {
            clsInfoDiff.add(cInfo);
        }
      }
    }
    if (diffMode) {
      Collections.sort(clsInfoDiff, ClassInfo.comparator);
    }
    return consistent;
  }
}