// Copyright (c) 2009 The Chromium Authors. All rights reserved.

// Use of this source code is governed by a BSD-style license that can be

// found in the LICENSE file.

package org.chromium.debug.core.model;

import org.chromium.debug.core.util.ChromiumDebugPluginUtil;

import org.chromium.sdk.JsValue;

import org.chromium.sdk.JsVariable;

import org.eclipse.core.runtime.CoreException;

import org.eclipse.debug.core.DebugException;

import org.eclipse.debug.core.model.IValue;

import org.eclipse.debug.core.model.IVariable;

import org.eclipse.debug.ui.actions.IWatchExpressionFactoryAdapter;

/**

 * An IVariable implementation over a JsVariable instance.

 */

public class Variable extends DebugElementImpl implements IVariable {

  private final JsVariable variable;

  /**

   * Specifies whether this variable is internal property (__proto__ etc).

   * TODO(peter.rybin): use it in UI.

   */

  private final boolean isInternalProperty;

  public Variable(IChromiumDebugTarget debugTarget, JsVariable variable, boolean isInternalProperty) {

    super(debugTarget);

    this.variable = variable;

    this.isInternalProperty = isInternalProperty;

  }

  public String getName() throws DebugException {

    return variable.getName();

  }

  public String getReferenceTypeName() throws DebugException {

    return variable.getValue().getType().toString();

  }

  public IValue getValue() throws DebugException {

    JsValue value = variable.isReadable()

        ? variable.getValue()

        : null;

    if (value == null) {

      return null;

    }

    return wrapValue(value);

  }

  public boolean hasValueChanged() throws DebugException {

    return false;

  }

  @SuppressWarnings("unchecked")

  @Override

  public Object getAdapter(Class adapter) {

    if (IWatchExpressionFactoryAdapter.class == adapter) {

      return new IWatchExpressionFactoryAdapter() {

        public String createWatchExpression(IVariable variable) throws CoreException {

          String expression = ((Variable) variable).getJsVariable().getFullyQualifiedName();

          if (expression == null) {

            expression = variable.getName();

          }

          return expression;

        }

      };

    }

    return super.getAdapter(adapter);

  }

  public void setValue(String expression) throws DebugException {

    variable.setValue(expression, null);

  }

  public void setValue(IValue value) throws DebugException {

    variable.setValue(((Value) value).getJsValue().getValueString(), null);

  }

  public boolean supportsValueModification() {

    return false; // TODO(apavlov): fix once V8 supports it

  }

  public boolean verifyValue(IValue value) throws DebugException {

    return verifyValue(value.getValueString());

  }

  public boolean verifyValue(String expression) {

    switch (variable.getValue().getType()) {

      case TYPE_NUMBER:

        return ChromiumDebugPluginUtil.isInteger(expression);

      default:

        return true;

    }

  }

  public boolean verifyValue(JsValue value) {

    return verifyValue(value.getValueString());

  }

  private IValue wrapValue(JsValue value) {

    return Value.create(getDebugTarget(), value);

  }

  public JsVariable getJsVariable() {

    return variable;

  }

}