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/*
 * Copyright 2010-2013 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.lang.descriptors.impl;

import com.google.common.collect.Sets;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.jet.lang.descriptors.*;
import org.jetbrains.jet.lang.descriptors.annotations.Annotations;
import org.jetbrains.jet.lang.resolve.name.Name;
import org.jetbrains.jet.lang.types.TypeSubstitutor;

import java.util.Collections;
import java.util.List;
import java.util.Set;

public abstract class PropertyAccessorDescriptorImpl extends DeclarationDescriptorNonRootImpl implements PropertyAccessorDescriptor {

    private final boolean hasBody;
    private final boolean isDefault;
    private final Modality modality;
    private final PropertyDescriptor correspondingProperty;
    private final Kind kind;
    private Visibility visibility;

    public PropertyAccessorDescriptorImpl(
            @NotNull Modality modality,
            @NotNull Visibility visibility,
            @NotNull PropertyDescriptor correspondingProperty,
            @NotNull Annotations annotations,
            @NotNull Name name,
            boolean hasBody,
            boolean isDefault,
            Kind kind,
            @NotNull SourceElement source
    ) {
        super(correspondingProperty.getContainingDeclaration(), annotations, name, source);
        this.modality = modality;
        this.visibility = visibility;
        this.correspondingProperty = correspondingProperty;
        this.hasBody = hasBody;
        this.isDefault = isDefault;
        this.kind = kind;
    }

    @Override
    public boolean hasBody() {
        return hasBody;
    }

    @Override
    public boolean isDefault() {
        return isDefault;
    }

    @NotNull
    @Override
    public Kind getKind() {
        return kind;
    }

    @NotNull
    @Override
    public FunctionDescriptor substitute(@NotNull TypeSubstitutor substitutor) {
        throw new UnsupportedOperationException(); // TODO
    }

    @NotNull
    @Override
    public List getTypeParameters() {
        return Collections.emptyList();
    }

    @Override
    public boolean hasStableParameterNames() {
        return false;
    }

    @Override
    public boolean hasSynthesizedParameterNames() {
        return false;
    }

    @NotNull
    @Override
    public Modality getModality() {
        return modality;
    }

    @NotNull
    @Override
    public Visibility getVisibility() {
        return visibility;
    }

    public void setVisibility(Visibility visibility) {
        this.visibility = visibility;
    }

    @Override
    @NotNull
    public PropertyDescriptor getCorrespondingProperty() {
        return correspondingProperty;
    }

    @Nullable
    @Override
    public ReceiverParameterDescriptor getReceiverParameter() {
        return getCorrespondingProperty().getReceiverParameter();
    }

    @Nullable
    @Override
    public ReceiverParameterDescriptor getExpectedThisObject() {
        return getCorrespondingProperty().getExpectedThisObject();
    }

    @NotNull
    @Override
    public PropertyAccessorDescriptor copy(
            DeclarationDescriptor newOwner,
            Modality modality,
            Visibility visibility,
            Kind kind,
            boolean copyOverrides
    ) {
        throw new UnsupportedOperationException("Accessors must be copied by the corresponding property");
    }

    @NotNull
    protected Set getOverriddenDescriptors(boolean isGetter) {
        Set overriddenProperties = getCorrespondingProperty().getOverriddenDescriptors();
        Set overriddenAccessors = Sets.newLinkedHashSet(); // LinkedHashSet for determinism
        for (PropertyDescriptor overriddenProperty : overriddenProperties) {
            PropertyAccessorDescriptor accessorDescriptor = isGetter ? overriddenProperty.getGetter() : overriddenProperty.getSetter();
            if (accessorDescriptor != null) {
                overriddenAccessors.add(accessorDescriptor);
            }
        }
        return overriddenAccessors;
    }

    @Override
    public void addOverriddenDescriptor(@NotNull CallableMemberDescriptor overridden) {
        throw new IllegalStateException();
    }

    @NotNull
    @Override
    public abstract PropertyAccessorDescriptor getOriginal();
}