/*
 * Copyright (c) 2011, the Dart project authors.
 * 
 * Licensed under the Eclipse Public License v1.0 (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.eclipse.org/legal/epl-v10.html
 * 
 * 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.dart.tools.debug.ui.internal.presentation;

import com.google.dart.tools.debug.core.dartium.DartiumDebugValue;
import com.google.dart.tools.debug.core.dartium.DartiumDebugVariable;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.debug.core.model.IValue;
import org.eclipse.debug.core.model.IVariable;
import org.eclipse.debug.internal.ui.model.elements.VariableLabelProvider;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IPresentationContext;
import org.eclipse.jface.viewers.TreePath;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.graphics.RGB;

/**
 * A rich label provider for debug variables and values.
 */
@SuppressWarnings("restriction")
public class DartiumVariableLabelProvider extends VariableLabelProvider {
  private final static boolean TWEAK_DARTIUM_MAP_KEY_NAMES = true;

  @Override
  protected FontData getFontData(TreePath elementPath, IPresentationContext presentationContext,
      String columnId) throws CoreException {
    FontData fontData = super.getFontData(elementPath, presentationContext, columnId);

    // Show static variables in italics.
    if (columnId != null && columnId.endsWith("_NAME")) {
      if (elementPath.getLastSegment() instanceof DartiumDebugVariable && fontData != null) {
        DartiumDebugVariable variable = (DartiumDebugVariable) elementPath.getLastSegment();

        if (variable.isStatic()) {
          fontData = new FontData(fontData.getName(), fontData.getHeight(), SWT.ITALIC);
        }
      }
    }

    return fontData;
  }

  @Override
  protected RGB getForeground(TreePath elementPath, IPresentationContext presentationContext,
      String columnId) throws CoreException {
    RGB rgb = super.getForeground(elementPath, presentationContext, columnId);

    // Dartium sends us map keys as if they were object properties - we tweak their display a bit.
    if (TWEAK_DARTIUM_MAP_KEY_NAMES) {
      if (columnId != null && columnId.endsWith("_NAME")) {
        if (elementPath.getLastSegment() instanceof DartiumDebugVariable) {
          DartiumDebugVariable variable = (DartiumDebugVariable) elementPath.getLastSegment();

          if (variable.getName().startsWith(":")) {
            rgb = new RGB(0x66, 0x66, 0x66);
          }
        }
      }
    }

    return rgb;
  }

  @Override
  protected String getValueText(IVariable variable, IValue value, IPresentationContext context)
      throws CoreException {
    if (value instanceof DartiumDebugValue) {
      DartiumDebugValue dartiumValue = (DartiumDebugValue) value;

      String str = dartiumValue.getDisplayString();

      if (str == null) {
        str = "";
      }

      if (str.length() > 0 && dartiumValue.getId() != null) {
        str += " [id=" + dartiumValue.getId() + "]";
      }

      return str;
    } else {
      return super.getValueText(variable, value, context);
    }
  }

  @Override
  protected String getVariableName(IVariable variable, IPresentationContext context)
      throws CoreException {
    if (variable instanceof DartiumDebugVariable) {
      DartiumDebugVariable dartiumVariable = (DartiumDebugVariable) variable;

      // Dartium sends us map keys as if they were object properties - we tweak their display a bit.
      if (TWEAK_DARTIUM_MAP_KEY_NAMES) {
        if (variable.getName().startsWith(":")) {
          return "[" + dartiumVariable.getDisplayName().substring(1) + "]";
        }
      }

      if ("[[class]]".equals(variable.getName())) {
        return "class";
      }

      return dartiumVariable.getDisplayName();
    } else {
      return super.getVariableName(variable, context);
    }
  }
}