/*
 * 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.scopes

import org.jetbrains.kotlin.descriptors.ClassDescriptor
import org.jetbrains.kotlin.descriptors.ClassKind
import org.jetbrains.kotlin.descriptors.PropertyDescriptor
import org.jetbrains.kotlin.descriptors.SimpleFunctionDescriptor
import org.jetbrains.kotlin.incremental.components.LookupLocation
import org.jetbrains.kotlin.name.Name
import org.jetbrains.kotlin.resolve.DescriptorFactory.*
import org.jetbrains.kotlin.storage.StorageManager
import org.jetbrains.kotlin.storage.getValue
import org.jetbrains.kotlin.utils.Printer
import org.jetbrains.kotlin.utils.SmartList

// We don't need to track lookups here since this scope used only for introduce special Enum class members
class StaticScopeForKotlinEnum(
    storageManager: StorageManager,
    private val containingClass: ClassDescriptor,
    private val enumEntriesCanBeUsed: Boolean,
) : MemberScopeImpl() {
    init {
        assert(containingClass.kind == ClassKind.ENUM_CLASS) { "Class should be an enum: $containingClass" }
    }

    override fun getContributedClassifier(name: Name, location: LookupLocation) = null // TODO

    private val functions: List<SimpleFunctionDescriptor> by storageManager.createLazyValue {
        listOf(createEnumValueOfMethod(containingClass), createEnumValuesMethod(containingClass))
    }

    private val properties: List<PropertyDescriptor> by storageManager.createLazyValue {
        if (enumEntriesCanBeUsed) {
            // It still might be filtered out later in tower resolve if feature disabled
            listOfNotNull(createEnumEntriesProperty(containingClass))
        } else {
            emptyList()
        }
    }

    override fun getContributedDescriptors(kindFilter: DescriptorKindFilter, nameFilter: (Name) -> Boolean) = functions + properties

    override fun getContributedFunctions(name: Name, location: LookupLocation) =
        functions.filterTo(SmartList()) { it.name == name }

    override fun getContributedVariables(name: Name, location: LookupLocation): Collection<PropertyDescriptor> =
        properties.filterTo(SmartList()) { it.name == name }

    override fun printScopeStructure(p: Printer) {
        p.println("Static scope for $containingClass")
    }
}
