/*
 * Copyright 2010-2012 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 org.jetbrains.jet.plugin.highlighter;

import com.intellij.lang.annotation.AnnotationHolder;
import com.intellij.openapi.editor.colors.TextAttributesKey;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiReference;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.jet.lang.descriptors.*;
import org.jetbrains.jet.lang.psi.*;
import org.jetbrains.jet.lang.resolve.BindingContext;

/**
 * @author Evgeny Gerashchenko
 * @since 3/29/12
 */
class TypeKindHighlightingVisitor extends AfterAnalysisHighlightingVisitor {
    TypeKindHighlightingVisitor(AnnotationHolder holder, BindingContext bindingContext) {
        super(holder, bindingContext);
    }

    @Override
    public void visitSimpleNameExpression(JetSimpleNameExpression expression) {
        PsiReference ref = expression.getReference();
        if (ref == null) return;
        if (JetPsiChecker.isNamesHighlightingEnabled()) {
            DeclarationDescriptor referenceTarget = bindingContext.get(BindingContext.REFERENCE_TARGET, expression);
            if (referenceTarget instanceof ConstructorDescriptor) {
                referenceTarget = referenceTarget.getContainingDeclaration();
            }

            if (referenceTarget instanceof ClassDescriptor) {
                highlightClassByKind((ClassDescriptor) referenceTarget, expression);
            }
            else if (referenceTarget instanceof TypeParameterDescriptor) {
                JetPsiChecker.highlightName(holder, expression, JetHighlightingColors.TYPE_PARAMETER);
            }
        }
    }

    @Override
    public void visitTypeParameter(JetTypeParameter parameter) {
        PsiElement identifier = parameter.getNameIdentifier();
        if (identifier != null) {
            JetPsiChecker.highlightName(holder, identifier, JetHighlightingColors.TYPE_PARAMETER);
        }
        super.visitTypeParameter(parameter);
    }

    @Override
    public void visitClass(JetClass klass) {
        PsiElement identifier = klass.getNameIdentifier();
        ClassDescriptor classDescriptor = bindingContext.get(BindingContext.CLASS, klass);
        if (identifier != null && classDescriptor != null) {
            highlightClassByKind(classDescriptor, identifier);
        }
        super.visitClass(klass);
    }

    private void highlightClassByKind(@NotNull ClassDescriptor classDescriptor, @NotNull PsiElement whatToHighlight) {
        TextAttributesKey textAttributes;
        switch (classDescriptor.getKind()) {
            case TRAIT:
                textAttributes = JetHighlightingColors.TRAIT;
                break;
            case ANNOTATION_CLASS:
                textAttributes = JetHighlightingColors.ANNOTATION;
                break;
            default:
                textAttributes = classDescriptor.getModality() == Modality.ABSTRACT
                                 ? JetHighlightingColors.ABSTRACT_CLASS
                                 : JetHighlightingColors.CLASS;
        }
        JetPsiChecker.highlightName(holder, whatToHighlight, textAttributes);
    }
}