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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.scopes;

import kotlin.Unit;
import kotlin.jvm.functions.Function1;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.annotations.TestOnly;
import org.jetbrains.kotlin.descriptors.*;
import org.jetbrains.kotlin.utils.Printer;

public final class ScopeUtils {
    private ScopeUtils() {}

    @NotNull
    public static MemberScope getStaticNestedClassesScope(@NotNull ClassDescriptor descriptor) {
        MemberScope innerClassesScope = descriptor.getUnsubstitutedInnerClassesScope();
        return new FilteringScope(innerClassesScope, new Function1() {
            @Override
            public Boolean invoke(DeclarationDescriptor descriptor) {
                return descriptor instanceof ClassDescriptor && !((ClassDescriptor) descriptor).isInner();
            }
        });
    }

    public static LexicalScope makeScopeForPropertyHeader(
            @NotNull LexicalScope parent,
            @NotNull final PropertyDescriptor propertyDescriptor
    ) {
        return new LexicalScopeImpl(parent, propertyDescriptor, false, null, LexicalScopeKind.PROPERTY_HEADER,
                                    // redeclaration on type parameters should be reported early, see: DescriptorResolver.resolvePropertyDescriptor()
                                    RedeclarationHandler.DO_NOTHING,
                                    new Function1() {
                                        @Override
                                        public Unit invoke(LexicalScopeImpl.InitializeHandler handler) {
                                            for (TypeParameterDescriptor typeParameterDescriptor : propertyDescriptor.getTypeParameters()) {
                                                handler.addClassifierDescriptor(typeParameterDescriptor);
                                            }
                                            return Unit.INSTANCE;
                                        }
                                    });
    }

    @NotNull
    public static LexicalScope makeScopeForPropertyInitializer(
            @NotNull LexicalScope propertyHeader,
            @NotNull PropertyDescriptor propertyDescriptor
    ) {
        return new LexicalScopeImpl(propertyHeader, propertyDescriptor, false, null, LexicalScopeKind.PROPERTY_INITIALIZER_OR_DELEGATE);
    }

    @NotNull
    public static LexicalScope makeScopeForDelegateConventionFunctions(
            @NotNull LexicalScope parent,
            @NotNull PropertyDescriptor propertyDescriptor
    ) {
        // todo: very strange scope!
        return new LexicalScopeImpl(parent, propertyDescriptor, true, propertyDescriptor.getExtensionReceiverParameter(),
                                    LexicalScopeKind.PROPERTY_DELEGATE_METHOD
        );
    }

    @TestOnly
    @NotNull
    public static String printStructure(@Nullable MemberScope scope) {
        StringBuilder out = new StringBuilder();
        Printer p = new Printer(out);
        if (scope == null) {
            p.println("null");
        }
        else {
            scope.printScopeStructure(p);
        }
        return out.toString();
    }
}