/*
 * Copyright 2000-2009 JetBrains s.r.o.
 *
 * 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.intellij.codeInsight.javadoc;

import com.intellij.psi.*;
import com.intellij.util.ArrayUtil;
import org.jetbrains.annotations.NotNull;

import java.awt.*;
import java.lang.reflect.Field;

/**
 * @author spleaner
 */
public class ColorUtil {
  private ColorUtil() {
  }

  public static String generatePreviewHtml(@NotNull final Color color) {
    return String.format("<div style=\"width: 50px; height: 30px; background-color: #%s; border: 1px solid #222;\">&nbsp;</div>", com.intellij.ui.ColorUtil.toHex(color));
  }

  public static void appendColorPreview(final PsiVariable variable, final StringBuilder buffer) {
    final PsiExpression initializer = variable.getInitializer();
    if (initializer != null) {
      final PsiType type = initializer.getType();
      if (type != null && "java.awt.Color".equals(type.getCanonicalText())) {
        if (initializer instanceof PsiNewExpression) {
          final PsiExpressionList argumentList = ((PsiNewExpression) initializer).getArgumentList();
          if (argumentList != null) {
            final PsiExpression[] expressions = argumentList.getExpressions();
            int[] values = ArrayUtil.newIntArray(expressions.length);
            float[] values2 = new float[expressions.length];
            int i = 0;
            int j = 0;

            final PsiConstantEvaluationHelper helper = JavaPsiFacade.getInstance(initializer.getProject()).getConstantEvaluationHelper();
            for (final PsiExpression each : expressions) {
              final Object o = helper.computeConstantExpression(each);
              if (o instanceof Integer) {
                values[i] = ((Integer) o).intValue();
                values[i] = values[i] > 255 ? 255 : values[i] < 0 ? 0 : values[i];
                i++;
              } else if (o instanceof Float) {
                values2[j] = ((Float) o).floatValue();
                values2[j] = values2[j] > 1 ? 1 : values2[j] < 0 ? 0 : values2[j];
                j++;
              }
            }

            Color c = null;
            if (i == expressions.length) {
              switch (values.length) {
                case 1:
                  c = new Color(values[0]);
                  break;
                case 3:
                  c = new Color(values[0], values[1], values[2]);
                  break;
                case 4:
                  c = new Color(values[0], values[1], values[2], values[3]);
                  break;
                default:
                  break;
              }
            } else if (j == expressions.length) {
              switch (values2.length) {
                case 3:
                  c = new Color(values2[0], values2[1], values2[2]);
                  break;
                case 4:
                  c = new Color(values2[0], values2[1], values2[2], values2[3]);
                  break;
                default:
                  break;
              }
            }

            if (c != null) {
              buffer.append(generatePreviewHtml(c));
            }
          }
        } else if (initializer instanceof PsiReferenceExpression) {
          final PsiReference reference = initializer.getReference();
          if (reference != null) {
            final PsiElement psiElement = reference.resolve();
            if (psiElement instanceof PsiField) {
              final PsiClass psiClass = ((PsiField) psiElement).getContainingClass();
              if (psiClass != null && "java.awt.Color".equals(psiClass.getQualifiedName())) {
                try {
                  Field field = Class.forName("java.awt.Color").getField(((PsiField)psiElement).getName());
                  final Color c = (Color) field.get(null);
                  buffer.append(generatePreviewHtml(c));
                } catch (Exception e) {
                  // nothing
                }
              }
            }
          }
        }
      }
    }
  }
}

@@ -993,16 +993,30 @@
 e=%5C%22
+padding: 1px; 
 width: 5
 0px;
@@ -1011,17 +1011,17 @@
 width: 5
-0
+2
 px; heig
@@ -1025,17 +1025,17 @@
 eight: 3
-0
+2
 px; back
@@ -1053,34 +1053,79 @@
 r: #
-%25s; border: 1px solid #222
+555555;%5C%22%3E%3Cdiv style=%5C%22width: 50px; height: 30px; background-color: #%25s
 ;%5C%22%3E
@@ -1136,16 +1136,22 @@
 p;%3C/div%3E
+%3C/div%3E
 %22, com.i
@@ -2372,16 +2372,42 @@
 %5D %3E 255 
+&& expressions.length %3E 1 
 ? 255 : 

fix java.awt.Color preview in quickDoc for some cases