/*
 * 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.calls.checkers

import com.intellij.psi.PsiElement
import org.jetbrains.kotlin.diagnostics.Errors
import org.jetbrains.kotlin.resolve.calls.model.ResolvedCall
import org.jetbrains.kotlin.types.KotlinType
import org.jetbrains.kotlin.types.typeUtil.isArrayOfNothing

class CallReturnsArrayOfNothingChecker : CallChecker {
    override fun check(resolvedCall: ResolvedCall<*>, reportOn: PsiElement, context: CallCheckerContext) {
        if (resolvedCall.resultingDescriptor.returnType.containsArrayOfNothing()) {
            context.trace.report(Errors.UNSUPPORTED.on(reportOn, "Array<Nothing> in return type is illegal"))
        }
    }

    private fun KotlinType?.containsArrayOfNothing(): Boolean {
        if (this == null || isComputingDeferredType(this)) return false

        return isArrayOfNothing() ||
                arguments.any { !it.isStarProjection && it.type.containsArrayOfNothing() }
    }
}
