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/*
 * Copyright 2010-2015 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.kotlin.resolve;

import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.kotlin.descriptors.*;
import org.jetbrains.kotlin.descriptors.annotations.Annotations;
import org.jetbrains.kotlin.descriptors.impl.*;
import org.jetbrains.kotlin.name.Name;
import org.jetbrains.kotlin.resolve.scopes.receivers.ExtensionReceiver;
import org.jetbrains.kotlin.types.JetType;
import org.jetbrains.kotlin.types.Variance;

import java.util.Collections;

import static org.jetbrains.kotlin.descriptors.ReceiverParameterDescriptor.NO_RECEIVER_PARAMETER;
import static org.jetbrains.kotlin.resolve.DescriptorUtils.getDefaultConstructorVisibility;
import static org.jetbrains.kotlin.resolve.descriptorUtil.DescriptorUtilPackage.getBuiltIns;

public class DescriptorFactory {
    private static class DefaultConstructorDescriptor extends ConstructorDescriptorImpl {
        public DefaultConstructorDescriptor(@NotNull ClassDescriptor containingClass, @NotNull SourceElement source) {
            super(containingClass, null, Annotations.EMPTY, true, Kind.DECLARATION, source);
            initialize(Collections.emptyList(), Collections.emptyList(),
                       getDefaultConstructorVisibility(containingClass));
        }
    }

    private DescriptorFactory() {
    }

    @NotNull
    public static PropertySetterDescriptorImpl createDefaultSetter(@NotNull PropertyDescriptor propertyDescriptor) {
        return createSetter(propertyDescriptor, true);
    }

    @NotNull
    public static PropertySetterDescriptorImpl createSetter(@NotNull PropertyDescriptor propertyDescriptor, boolean isDefault) {
        PropertySetterDescriptorImpl setterDescriptor =
                new PropertySetterDescriptorImpl(propertyDescriptor, Annotations.EMPTY, propertyDescriptor.getModality(),
                                                 propertyDescriptor.getVisibility(), !isDefault, isDefault,
                                                 CallableMemberDescriptor.Kind.DECLARATION, null, SourceElement.NO_SOURCE);
        setterDescriptor.initializeDefault();
        return setterDescriptor;
    }

    @NotNull
    public static PropertyGetterDescriptorImpl createDefaultGetter(@NotNull PropertyDescriptor propertyDescriptor) {
        return createGetter(propertyDescriptor, true);
    }

    @NotNull
    public static PropertyGetterDescriptorImpl createGetter(@NotNull PropertyDescriptor propertyDescriptor, boolean isDefault) {
        return new PropertyGetterDescriptorImpl(propertyDescriptor, Annotations.EMPTY, propertyDescriptor.getModality(),
                                                propertyDescriptor.getVisibility(), !isDefault, isDefault,
                                                CallableMemberDescriptor.Kind.DECLARATION, null, SourceElement.NO_SOURCE);
    }

    @NotNull
    public static ConstructorDescriptorImpl createPrimaryConstructorForObject(
            @NotNull ClassDescriptor containingClass,
            @NotNull SourceElement source
    ) {
        return new DefaultConstructorDescriptor(containingClass, source);
    }

    public static boolean isDefaultPrimaryConstructor(@NotNull ConstructorDescriptor constructor) {
        return constructor instanceof DefaultConstructorDescriptor;
    }

    @NotNull
    public static SimpleFunctionDescriptor createEnumValuesMethod(@NotNull ClassDescriptor enumClass) {
        SimpleFunctionDescriptorImpl values =
                SimpleFunctionDescriptorImpl.create(enumClass, Annotations.EMPTY, DescriptorUtils.ENUM_VALUES,
                                                    CallableMemberDescriptor.Kind.SYNTHESIZED, enumClass.getSource());
        return values.initialize(null, NO_RECEIVER_PARAMETER, Collections.emptyList(),
                                 Collections.emptyList(),
                                 getBuiltIns(enumClass).getArrayType(Variance.INVARIANT, enumClass.getDefaultType()), Modality.FINAL,
                                 Visibilities.PUBLIC);
    }

    @NotNull
    public static SimpleFunctionDescriptor createEnumValueOfMethod(@NotNull ClassDescriptor enumClass) {
        SimpleFunctionDescriptorImpl valueOf =
                SimpleFunctionDescriptorImpl.create(enumClass, Annotations.EMPTY, DescriptorUtils.ENUM_VALUE_OF,
                                                    CallableMemberDescriptor.Kind.SYNTHESIZED, enumClass.getSource());
        ValueParameterDescriptor parameterDescriptor = new ValueParameterDescriptorImpl(
                valueOf, null, 0, Annotations.EMPTY, Name.identifier("value"), getBuiltIns(enumClass).getStringType(), false, null,
                enumClass.getSource()
        );
        return valueOf.initialize(null, NO_RECEIVER_PARAMETER, Collections.emptyList(),
                                  Collections.singletonList(parameterDescriptor), enumClass.getDefaultType(), Modality.FINAL,
                                  Visibilities.PUBLIC);
    }

    @Nullable
    public static ReceiverParameterDescriptor createExtensionReceiverParameterForCallable(
            @NotNull CallableDescriptor owner,
            @Nullable JetType receiverParameterType
    ) {
        return receiverParameterType == null
               ? NO_RECEIVER_PARAMETER
               : new ReceiverParameterDescriptorImpl(owner, receiverParameterType, new ExtensionReceiver(owner, receiverParameterType));
    }
}