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/*
 * Copyright 2008 CoreMedia AG
 * 
 * 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 net.jangaroo.jooc.ast;

import net.jangaroo.jooc.JangarooParser;
import net.jangaroo.jooc.JooSymbol;
import net.jangaroo.jooc.Jooc;
import net.jangaroo.jooc.Scope;
import net.jangaroo.jooc.sym;
import net.jangaroo.utils.AS3Type;

import java.io.IOException;
import java.util.List;

/**
 * @author Andreas Gawecki
 * @author Frank Wienberg
 */
public class VariableDeclaration extends TypedIdeDeclaration {
  private JooSymbol optSymConstOrVar;
  private Initializer optInitializer;
  private VariableDeclaration optNextVariableDeclaration;
  private JooSymbol optSymSemicolon;

  // null: not yet computed; false: no constant or currently computing; true: constant
  private Boolean declaringCompileTimeConstant = null;
  // null: not yet computed; false: no constant or currently computing; true: constant
  private Boolean declaringStandAloneConstant = null;

  private VariableDeclaration previousVariableDeclaration;

  public VariableDeclaration(AnnotationsAndModifiers am,
                             JooSymbol optSymConstOrVar,
                             Ide ide,
                             TypeRelation optTypeRelation,
                             Initializer optInitializer,
                             VariableDeclaration optNextVariableDeclaration,
                             JooSymbol optSymSemicolon) {
    // inherit modifiers of first declaration to those following this declaration
    super(am, ide, optTypeRelation);
    this.optSymConstOrVar = optSymConstOrVar;
    this.optInitializer = optInitializer;
    this.optNextVariableDeclaration = optNextVariableDeclaration;
    this.optSymSemicolon = optSymSemicolon;
    if (optNextVariableDeclaration != null) {
      optNextVariableDeclaration.previousVariableDeclaration = this;
      if (optSymSemicolon != null) {
        optNextVariableDeclaration.setInheritedModifiers(toSymbolArray(am.getModifiers()));
      }
    }
  }

  @Override
  public List getChildren() {
    return makeChildren(super.getChildren(), optInitializer, optNextVariableDeclaration);
  }

  @Override
  public JooSymbol getDeclarationSymbol() {
    return getOptSymConstOrVar();
  }

  @Override
  public void visit(AstVisitor visitor) throws IOException {
    visitor.visitVariableDeclaration(this);
  }

  protected int getAllowedModifiers() {
    return MODIFIERS_SCOPE | MODIFIER_STATIC;
  }

  public VariableDeclaration(JooSymbol symConstOrVar,
                             Ide ide,
                             TypeRelation optTypeRelation,
                             Initializer optInitializer,
                             VariableDeclaration optNextVariableDeclaration,
                             JooSymbol optSymSemicolon) {
    this(new AnnotationsAndModifiers(null,null), symConstOrVar, ide, optTypeRelation, optInitializer, optNextVariableDeclaration, optSymSemicolon);
  }

  public VariableDeclaration(JooSymbol symConstOrVar,
                             Ide ide,
                             TypeRelation optTypeRelation,
                             Initializer optInitializer,
                             VariableDeclaration optNextVariableDeclaration) {
    this(symConstOrVar, ide, optTypeRelation, optInitializer, optNextVariableDeclaration, null);
  }

  public VariableDeclaration(JooSymbol symConstOrVar,
                             Ide ide,
                             TypeRelation optTypeRelation,
                             Initializer optInitializer) {
    this(symConstOrVar, ide, optTypeRelation, optInitializer, null);
  }

  public VariableDeclaration(JooSymbol symConstOrVar,
                             Ide ide,
                             TypeRelation optTypeRelation) {
    this(symConstOrVar, ide, optTypeRelation, null, null, null);
  }

  @Override
  protected void setInheritedModifiers(final JooSymbol[] modifiers) {
    super.setInheritedModifiers(modifiers);
    if (getOptNextVariableDeclaration() != null) {
      getOptNextVariableDeclaration().setInheritedModifiers(modifiers);
    }
  }

  @Override
  public void setClassMember(boolean classMember) {
    super.setClassMember(classMember);
    if (getOptNextVariableDeclaration() != null) {
      getOptNextVariableDeclaration().setClassMember(classMember);
    }
  }

  @Override
  public boolean isStatic() {
    return super.isStatic() || getAnnotation(Jooc.EMBED_ANNOTATION_NAME) != null;
  }

  @Override
  public boolean isWritable() {
    return !isConst();
  }

  public boolean isDeclaringCompileTimeConstant() {
    if (declaringCompileTimeConstant == null) {
      declaringCompileTimeConstant = false; // avoid infinite recursion if a const is defined using itself
      if (isConst()) {
        declaringCompileTimeConstant = getOptInitializer() == null || getOptInitializer().getValue().isCompileTimeConstant();
      }
    }
    return declaringCompileTimeConstant;
  }

  public boolean isDeclaringStandAloneConstant() {
    if (declaringStandAloneConstant == null) {
      declaringStandAloneConstant = false; // avoid infinite recursion if a const is defined using itself
      if (isConst()) {
        declaringStandAloneConstant = getOptInitializer() == null || getOptInitializer().getValue().isStandAloneConstant();
      }
    }
    return declaringStandAloneConstant;
  }

  public void analyze(AstNode parentNode) {
    super.analyze(parentNode);
    if (getOptInitializer() != null) {
      getOptInitializer().analyze(this);
    } else if (isConst()
      && getIde().getScope().getCompilationUnit().getPrimaryDeclaration().getAnnotation(Jooc.NATIVE_ANNOTATION_NAME) == null) {
      JangarooParser.warning(getOptSymConstOrVar(), "constant should be initialized");
    }
    if (getOptNextVariableDeclaration() != null) {
      getOptNextVariableDeclaration().analyze(this);
    }
    if (isClassMember() && !isStatic() && getOptInitializer() != null && !getOptInitializer().getValue().isRuntimeConstant()) {
      getClassDeclaration().addFieldWithInitializer(this);
    }
    if (isClassMember() && isConst() && isPublicApi() && getOptInitializer() != null && getOptInitializer().getValue().isCompileTimeConstant()) {
      getOptInitializer().addPublicApiDependencies();
    }
  }

  public static String getDefaultValue(TypeRelation typeRelation) {
    return AS3Type.getDefaultValue(typeRelation == null ? null : typeRelation.getType().getSymbol().getText());
  }

  boolean allowDuplicates(Scope scope) {
    // todo It is "worst practice" to redeclare local variables in AS3, make this configurable:
    return !isClassMember();
  }

  @Override
  public void scope(final Scope scope) {
    super.scope(scope);
    if (getOptInitializer() != null) {
      getOptInitializer().scope(scope);
    }
    if (getOptNextVariableDeclaration() != null) {
      getOptNextVariableDeclaration().scope(scope);
    }
  }

  public boolean hasPreviousVariableDeclaration() {
    return previousVariableDeclaration != null;
  }

  protected VariableDeclaration getPreviousVariableDeclaration() {
    return previousVariableDeclaration;
  }

  protected VariableDeclaration getFirstVariableDeclaration() {
    VariableDeclaration firstVariableDeclaration = this;
    while (firstVariableDeclaration.hasPreviousVariableDeclaration()) {
      firstVariableDeclaration = firstVariableDeclaration.getPreviousVariableDeclaration();
    }
    return firstVariableDeclaration;
  }

  @Override
  public int getModifiers() {
    return hasPreviousVariableDeclaration()
            ? getFirstVariableDeclaration().getModifiers()
            : super.getModifiers();
  }

  public boolean isConst() {
    VariableDeclaration firstVariableDeclaration = getFirstVariableDeclaration();
    return firstVariableDeclaration.getOptSymConstOrVar() != null && firstVariableDeclaration.getOptSymConstOrVar().sym == sym.CONST;
  }

  public JooSymbol getOptSymConstOrVar() {
    return optSymConstOrVar;
  }

  public Initializer getOptInitializer() {
    return optInitializer;
  }

  public VariableDeclaration getOptNextVariableDeclaration() {
    return optNextVariableDeclaration;
  }

  public JooSymbol getOptSymSemicolon() {
    return optSymSemicolon;
  }

}