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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.js.translate.utils;

import com.intellij.psi.PsiFile;
import kotlin.collections.CollectionsKt;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.kotlin.descriptors.*;
import org.jetbrains.kotlin.descriptors.annotations.AnnotationDescriptor;
import org.jetbrains.kotlin.js.PredefinedAnnotation;
import org.jetbrains.kotlin.name.FqName;
import org.jetbrains.kotlin.name.JsStandardClassIds.Annotations;
import org.jetbrains.kotlin.psi.KtAnnotationEntry;
import org.jetbrains.kotlin.psi.KtFile;
import org.jetbrains.kotlin.resolve.BindingContext;
import org.jetbrains.kotlin.resolve.DescriptorUtils;
import org.jetbrains.kotlin.resolve.constants.ConstantValue;
import org.jetbrains.kotlin.resolve.source.PsiSourceFile;
import org.jetbrains.kotlin.serialization.js.KotlinJavascriptPackageFragment;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import static org.jetbrains.kotlin.resolve.descriptorUtil.DescriptorUtilsKt.isEffectivelyExternal;

public final class AnnotationsUtils {
    private static final FqName JS_NAME = Annotations.JsName.asSingleFqName();
    private static final FqName JS_EXPORT = Annotations.JsExport.asSingleFqName();
    private static final FqName JS_EXPORT_IGNORE = Annotations.JsExportIgnore.asSingleFqName();
    private static final FqName JS_MODULE_ANNOTATION = Annotations.JsModule.asSingleFqName();
    private static final FqName JS_NON_MODULE_ANNOTATION = Annotations.JsNonModule.asSingleFqName();
    private static final FqName JS_QUALIFIER_ANNOTATION = Annotations.JsQualifier.asSingleFqName();
    private static final FqName JS_EXTERNAL_INHERITORS_ONLY = Annotations.JsExternalInheritorsOnly.asSingleFqName();
    private static final FqName JS_EXTERNAL_ARGUMENT = Annotations.JsExternalArgument.asSingleFqName();

    private AnnotationsUtils() {
    }

    public static boolean hasAnnotation(
            @NotNull DeclarationDescriptor descriptor,
            @NotNull PredefinedAnnotation annotation
    ) {
        return getAnnotationByName(descriptor, annotation) != null;
    }

    @Nullable
    private static String getAnnotationStringParameter(@NotNull DeclarationDescriptor declarationDescriptor,
            @NotNull PredefinedAnnotation annotation) {
        AnnotationDescriptor annotationDescriptor = getAnnotationByName(declarationDescriptor, annotation);
        assert annotationDescriptor != null;
        //TODO: this is a quick fix for unsupported default args problem
        if (annotationDescriptor.getAllValueArguments().isEmpty()) {
            return null;
        }
        ConstantValue constant = annotationDescriptor.getAllValueArguments().values().iterator().next();
        //TODO: this is a quick fix for unsupported default args problem
        if (constant == null) {
            return null;
        }
        Object value = constant.getValue();
        assert value instanceof String : "Native function annotation should have one String parameter";
        return (String) value;
    }

    @Nullable
    public static String getNameForAnnotatedObject(@NotNull DeclarationDescriptor declarationDescriptor,
            @NotNull PredefinedAnnotation annotation) {
        if (!hasAnnotation(declarationDescriptor, annotation)) {
            return null;
        }
        return getAnnotationStringParameter(declarationDescriptor, annotation);
    }

    @Nullable
    public static String getNameForAnnotatedObject(
            @NotNull DeclarationDescriptor descriptor,
            @NotNull BindingContext bindingContext
    ) {
        String defaultJsName = getJsName(descriptor);

        for (PredefinedAnnotation annotation : PredefinedAnnotation.Companion.getWITH_CUSTOM_NAME()) {
            if (!hasAnnotationOrInsideAnnotatedClass(descriptor, annotation)) {
                continue;
            }
            String name = getNameForAnnotatedObject(descriptor, annotation);
            if (name == null) {
                name = defaultJsName;
            }
            return name != null ? name : descriptor.getName().asString();
        }

        if (defaultJsName == null && (isEffectivelyExternalMember(descriptor) || isExportedObject(descriptor, bindingContext))) {
            return descriptor.getName().asString();
        }

        return defaultJsName;
    }

    @Nullable
    private static AnnotationDescriptor getAnnotationByName(
            @NotNull DeclarationDescriptor descriptor,
            @NotNull PredefinedAnnotation annotation
    ) {
        return descriptor.getAnnotations().findAnnotation(annotation.getFqName());
    }

    public static boolean isExportedObject(@NotNull DeclarationDescriptor descriptor, @NotNull BindingContext bindingContext) {
        if (descriptor instanceof MemberDescriptor) {
            MemberDescriptor memberDescriptor = (MemberDescriptor) descriptor;
            DescriptorVisibility visibility = memberDescriptor.getVisibility();
            if (visibility != DescriptorVisibilities.PUBLIC && visibility != DescriptorVisibilities.PROTECTED) return false;
        }

        if (hasAnnotationOrInsideAnnotatedClass(descriptor, JS_EXPORT_IGNORE)) return false;

        if (descriptor instanceof PropertyAccessorDescriptor) {
            PropertyAccessorDescriptor propertyAccessor = (PropertyAccessorDescriptor) descriptor;
            if (propertyAccessor.getCorrespondingProperty().getAnnotations().hasAnnotation(JS_EXPORT_IGNORE)) return false;
        }

        if (hasAnnotationOrInsideAnnotatedClass(descriptor, JS_EXPORT)) return true;

        if (CollectionsKt.any(getContainingFileAnnotations(bindingContext, descriptor), annotation ->
                JS_EXPORT.equals(annotation.getFqName())
        )) {
            return true;
        }

        return false;
    }

    public static boolean isNativeObject(@NotNull DeclarationDescriptor descriptor) {
        if (hasAnnotationOrInsideAnnotatedClass(descriptor, PredefinedAnnotation.NATIVE) || isEffectivelyExternalMember(descriptor)) return true;

        if (descriptor instanceof PropertyAccessorDescriptor) {
            PropertyAccessorDescriptor accessor = (PropertyAccessorDescriptor) descriptor;
            return hasAnnotationOrInsideAnnotatedClass(accessor.getCorrespondingProperty(), PredefinedAnnotation.NATIVE);
        }

        return false;
    }

    public static boolean isNativeInterface(@NotNull DeclarationDescriptor descriptor) {
        return isNativeObject(descriptor) && DescriptorUtils.isInterface(descriptor);
    }

    private static boolean isEffectivelyExternalMember(@NotNull DeclarationDescriptor descriptor) {
        return descriptor instanceof MemberDescriptor && isEffectivelyExternal((MemberDescriptor) descriptor);
    }

    public static boolean isLibraryObject(@NotNull DeclarationDescriptor descriptor) {
        return hasAnnotationOrInsideAnnotatedClass(descriptor, PredefinedAnnotation.LIBRARY);
    }

    @Nullable
    public static String getJsName(@NotNull DeclarationDescriptor descriptor) {
        AnnotationDescriptor annotation = getJsNameAnnotation(descriptor);
        if (annotation == null || annotation.getAllValueArguments().isEmpty()) return null;

        ConstantValue value = annotation.getAllValueArguments().values().iterator().next();
        if (value == null) return null;

        Object result = value.getValue();
        if (!(result instanceof String)) return null;

        return (String) result;
    }

    @Nullable
    public static AnnotationDescriptor getJsNameAnnotation(@NotNull DeclarationDescriptor descriptor) {
        return descriptor.getAnnotations().findAnnotation(JS_NAME);
    }

    @Nullable
    public static AnnotationDescriptor getJsExportAnnotation(@NotNull DeclarationDescriptor descriptor) {
        return descriptor.getAnnotations().findAnnotation(JS_EXPORT);
    }

    public static boolean isPredefinedObject(@NotNull DeclarationDescriptor descriptor) {
        if (descriptor instanceof MemberDescriptor && ((MemberDescriptor) descriptor).isExpect()) return true;
        if (isEffectivelyExternalMember(descriptor)) return true;

        for (PredefinedAnnotation annotation : PredefinedAnnotation.values()) {
            if (hasAnnotationOrInsideAnnotatedClass(descriptor, annotation)) {
                return true;
            }
        }

        return false;
    }

    private static boolean hasAnnotationOrInsideAnnotatedClass(
            @NotNull DeclarationDescriptor descriptor,
            @NotNull PredefinedAnnotation annotation
    ) {
        return hasAnnotationOrInsideAnnotatedClass(descriptor, annotation.getFqName());
    }

    private static boolean hasAnnotationOrInsideAnnotatedClass(@NotNull DeclarationDescriptor descriptor, @NotNull FqName fqName) {
        if (descriptor.getAnnotations().hasAnnotation(fqName)) return true;

        ClassDescriptor containingClass = DescriptorUtils.getContainingClass(descriptor);
        return containingClass != null && hasAnnotationOrInsideAnnotatedClass(containingClass, fqName);
    }

    public static boolean hasJsNameInAccessors(@NotNull PropertyDescriptor property) {
        for (PropertyAccessorDescriptor accessor : property.getAccessors()) {
            if (getJsName(accessor) != null) return true;
        }
        return false;
    }

    @Nullable
    public static String getModuleName(@NotNull DeclarationDescriptor declaration) {
        AnnotationDescriptor annotation = declaration.getAnnotations().findAnnotation(JS_MODULE_ANNOTATION);
        return annotation != null ? extractSingleStringArgument(annotation) : null;
    }

    @Nullable
    public static String getFileModuleName(@NotNull BindingContext bindingContext, @NotNull DeclarationDescriptor declaration) {
        return getSingleStringAnnotationArgument(bindingContext, declaration, JS_MODULE_ANNOTATION);
    }

    @Nullable
    public static String getFileQualifier(@NotNull BindingContext bindingContext, @NotNull DeclarationDescriptor declaration) {
        return getSingleStringAnnotationArgument(bindingContext, declaration, JS_QUALIFIER_ANNOTATION);
    }

    @Nullable
    private static String getSingleStringAnnotationArgument(
            @NotNull BindingContext bindingContext,
            @NotNull DeclarationDescriptor declaration,
            @NotNull FqName annotationFqName
    ) {
        for (AnnotationDescriptor annotation : getContainingFileAnnotations(bindingContext, declaration)) {
            if (annotationFqName.equals(annotation.getFqName())) {
                return extractSingleStringArgument(annotation);
            }
        }
        return null;
    }

    public static boolean isNonModule(@NotNull DeclarationDescriptor declaration) {
        return declaration.getAnnotations().findAnnotation(JS_NON_MODULE_ANNOTATION) != null;
    }

    public static boolean isFromNonModuleFile(@NotNull BindingContext bindingContext, @NotNull DeclarationDescriptor declaration) {
        return CollectionsKt.any(getContainingFileAnnotations(bindingContext, declaration), annotation ->
                JS_NON_MODULE_ANNOTATION.equals(annotation.getFqName())
        );
    }

    public static boolean isJsExternalInheritorsOnly(@NotNull ClassDescriptor declaration) {
        return declaration.getAnnotations().hasAnnotation(JS_EXTERNAL_INHERITORS_ONLY);
    }

    public static boolean isJsExternalArgument(@NotNull ValueParameterDescriptor declaration) {
        return declaration.getAnnotations().hasAnnotation(JS_EXTERNAL_ARGUMENT);
    }

    @Nullable
    private static String extractSingleStringArgument(@NotNull AnnotationDescriptor annotation) {
        if (annotation.getAllValueArguments().isEmpty()) return null;

        ConstantValue importValue = annotation.getAllValueArguments().values().iterator().next();
        if (importValue == null) return null;

        if (!(importValue.getValue() instanceof String)) return null;
        return (String) importValue.getValue();
    }

    @NotNull
    public static List getContainingFileAnnotations(
            @NotNull BindingContext bindingContext,
            @NotNull DeclarationDescriptor descriptor
    ) {
        PackageFragmentDescriptor containingPackage = DescriptorUtils.getParentOfType(descriptor, PackageFragmentDescriptor.class, false);
        if (containingPackage instanceof KotlinJavascriptPackageFragment) {
            return ((KotlinJavascriptPackageFragment) containingPackage).getContainingFileAnnotations(descriptor);
        }

        KtFile kotlinFile = getFile(descriptor);
        if (kotlinFile != null) {
            List annotations = new ArrayList<>();
            for (KtAnnotationEntry psiAnnotation : kotlinFile.getAnnotationEntries()) {
                AnnotationDescriptor annotation = bindingContext.get(BindingContext.ANNOTATION, psiAnnotation);
                if (annotation != null) {
                    annotations.add(annotation);
                }
            }
            return annotations;
        }

        return Collections.emptyList();
    }

    @Nullable
    private static KtFile getFile(DeclarationDescriptor descriptor) {
        if (!(descriptor instanceof DeclarationDescriptorWithSource)) return null;
        SourceFile file = ((DeclarationDescriptorWithSource) descriptor).getSource().getContainingFile();
        if (!(file instanceof PsiSourceFile)) return null;

        PsiFile psiFile = ((PsiSourceFile) file).getPsiFile();
        if (!(psiFile instanceof KtFile)) return null;

        return (KtFile) psiFile;
    }
}