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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.builtins;

import kotlin.KotlinPackage;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.kotlin.descriptors.CallableDescriptor;
import org.jetbrains.kotlin.descriptors.ClassDescriptor;
import org.jetbrains.kotlin.descriptors.DeclarationDescriptor;
import org.jetbrains.kotlin.descriptors.ValueParameterDescriptor;
import org.jetbrains.kotlin.descriptors.annotations.Annotated;
import org.jetbrains.kotlin.descriptors.annotations.AnnotationDescriptor;
import org.jetbrains.kotlin.resolve.DescriptorUtils;
import org.jetbrains.kotlin.resolve.constants.ArrayValue;
import org.jetbrains.kotlin.resolve.constants.CompileTimeConstant;
import org.jetbrains.kotlin.resolve.constants.EnumValue;

import java.util.List;

public class InlineUtil {

    public static boolean hasNoinlineAnnotation(@NotNull CallableDescriptor valueParameterDescriptor) {
        return KotlinBuiltIns.containsAnnotation(valueParameterDescriptor, KotlinBuiltIns.getNoinlineClassAnnotationFqName());
    }

    @NotNull
    public static InlineStrategy getInlineType(@NotNull DeclarationDescriptor descriptor) {
        ClassDescriptor inlineAnnotation = KotlinBuiltIns.getInstance().getInlineClassAnnotation();
        AnnotationDescriptor annotation = descriptor.getAnnotations().findAnnotation(DescriptorUtils.getFqNameSafe(inlineAnnotation));
        if (annotation == null) {
            return InlineStrategy.NOT_INLINE;
        }
        CompileTimeConstant argument = getAnnotationSingleArgument(descriptor, inlineAnnotation);
        if (argument == null) {
            return InlineStrategy.AS_FUNCTION;
        }
        assert argument instanceof EnumValue : "Inline annotation parameter should be enum entry but was: " + argument;
        String name = ((EnumValue) argument).getValue().getName().asString();
        return name.equals(InlineStrategy.IN_PLACE.name()) ? InlineStrategy.IN_PLACE : InlineStrategy.AS_FUNCTION;
    }

    public static boolean hasOnlyLocalContinueAndBreak(@NotNull ValueParameterDescriptor descriptor) {
        return hasInlineOption(descriptor, InlineOption.LOCAL_CONTINUE_AND_BREAK);
    }

    public static boolean hasOnlyLocalReturn(@NotNull ValueParameterDescriptor descriptor) {
        return hasInlineOption(descriptor, InlineOption.ONLY_LOCAL_RETURN);
    }

    private static boolean hasInlineOption(@NotNull ValueParameterDescriptor descriptor, @NotNull InlineOption option) {
        CompileTimeConstant argument =
                getAnnotationSingleArgument(descriptor, KotlinBuiltIns.getInstance().getInlineOptionsClassAnnotation());

        if (argument instanceof ArrayValue) {
            List> values = ((ArrayValue) argument).getValue();

            for (CompileTimeConstant value : values) {
                if (value instanceof EnumValue) {
                    if (((EnumValue) value).getValue().getName().asString().equals(option.name())) {
                        return true;
                    }
                }
            }
        }

        return false;
    }

    @Nullable
    private static CompileTimeConstant getAnnotationSingleArgument(
            @NotNull Annotated annotated,
            @NotNull ClassDescriptor annotationClass
    ) {
        AnnotationDescriptor annotation = annotated.getAnnotations().findAnnotation(DescriptorUtils.getFqNameSafe(annotationClass));
        if (annotation != null) {
            return KotlinPackage.firstOrNull(annotation.getAllValueArguments().values());
        }
        return null;
    }
}