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/*
 * Copyright 2010-2016 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.resolve.diagnostics

import org.jetbrains.kotlin.builtins.isBuiltinFunctionalTypeOrSubtype
import org.jetbrains.kotlin.descriptors.ClassDescriptor
import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
import org.jetbrains.kotlin.descriptors.FunctionDescriptor
import org.jetbrains.kotlin.descriptors.Modality
import org.jetbrains.kotlin.psi.KtClassOrObject
import org.jetbrains.kotlin.psi.KtDeclaration
import org.jetbrains.kotlin.resolve.calls.components.hasDefaultValue
import org.jetbrains.kotlin.resolve.checkers.DeclarationChecker
import org.jetbrains.kotlin.resolve.checkers.DeclarationCheckerContext
import org.jetbrains.kotlin.resolve.descriptorUtil.isEffectivelyExternal
import org.jetbrains.kotlin.resolve.scopes.DescriptorKindFilter
import org.jetbrains.kotlin.types.typeUtil.immediateSupertypes

object JsInheritanceChecker : DeclarationChecker {
    override fun check(declaration: KtDeclaration, descriptor: DeclarationDescriptor, context: DeclarationCheckerContext) {
        if (descriptor is FunctionDescriptor && !descriptor.isEffectivelyExternal() &&
            isOverridingExternalWithOptionalParams(descriptor)
        ) {
            context.trace.report(ErrorsJs.OVERRIDING_EXTERNAL_FUN_WITH_OPTIONAL_PARAMS.on(declaration))
        }
        else if (descriptor is ClassDescriptor && !descriptor.isEffectivelyExternal()) {
            val fakeOverriddenMethod = findFakeMethodOverridingExternalWithOptionalParams(descriptor)
            if (fakeOverriddenMethod != null) {
                context.trace.report(ErrorsJs.OVERRIDING_EXTERNAL_FUN_WITH_OPTIONAL_PARAMS_WITH_FAKE.on(declaration, fakeOverriddenMethod))
            }
        }

        if (descriptor is ClassDescriptor &&
            descriptor.defaultType.immediateSupertypes().any { it.isBuiltinFunctionalTypeOrSubtype }
        ) {
            context.trace.report(ErrorsJs.IMPLEMENTING_FUNCTION_INTERFACE.on(declaration as KtClassOrObject))
        }
    }

    private fun isOverridingExternalWithOptionalParams(function: FunctionDescriptor): Boolean {
        if (!function.kind.isReal && function.modality == Modality.ABSTRACT) return false

        for (overriddenFunction in function.overriddenDescriptors.filter { it.isEffectivelyExternal() }) {
            if (overriddenFunction.valueParameters.any { it.hasDefaultValue() }) return true
        }

        return false
    }

    private fun findFakeMethodOverridingExternalWithOptionalParams(cls: ClassDescriptor): FunctionDescriptor? {
        val members = cls.unsubstitutedMemberScope.getContributedDescriptors(DescriptorKindFilter.CALLABLES)
                .mapNotNull { it as? FunctionDescriptor }
                .filter { it.containingDeclaration == cls && !it.kind.isReal && it.overriddenDescriptors.size > 1 }

        return members.firstOrNull { isOverridingExternalWithOptionalParams(it) }
    }
}