/*
 * 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.resolve

import org.jetbrains.kotlin.descriptors.*
import org.jetbrains.kotlin.diagnostics.Errors
import org.jetbrains.kotlin.resolve.calls.util.FakeCallableDescriptorForTypeAliasObject
import org.jetbrains.kotlin.resolve.descriptorUtil.classValueDescriptor
import org.jetbrains.kotlin.resolve.descriptorUtil.classValueTypeDescriptor
import org.jetbrains.kotlin.resolve.descriptorUtil.hasCompanionObject
import org.jetbrains.kotlin.resolve.scopes.receivers.*
import org.jetbrains.kotlin.types.expressions.ExpressionTypingContext

fun resolveQualifierAsReceiverInExpression(
    qualifier: Qualifier, selector: DeclarationDescriptor?, context: ExpressionTypingContext
): DeclarationDescriptor {
    val referenceTarget = resolveQualifierReferenceTarget(qualifier, selector, context)

    if (referenceTarget is TypeParameterDescriptor) {
        context.trace.report(Errors.TYPE_PARAMETER_ON_LHS_OF_DOT.on(qualifier.referenceExpression, referenceTarget))
    }

    return referenceTarget
}

fun resolveQualifierAsStandaloneExpression(
    qualifier: Qualifier, context: ExpressionTypingContext
): DeclarationDescriptor {
    val referenceTarget = resolveQualifierReferenceTarget(qualifier, null, context)

    when (referenceTarget) {
        is TypeAliasDescriptor -> {
            referenceTarget.classDescriptor?.let { classDescriptor ->
                if (!classDescriptor.kind.isSingleton) {
                    context.trace.report(Errors.NO_COMPANION_OBJECT.on(qualifier.referenceExpression, referenceTarget))
                }
