/*
 * 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.idea.util

import com.intellij.openapi.components.ServiceManager
import com.intellij.openapi.project.Project
import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
import org.jetbrains.kotlin.psi.KtFile
import org.jetbrains.kotlin.resolve.ImportPath
import java.util.*

abstract class ImportInsertHelper {
    /*TODO: implementation is not quite correct*/
    abstract fun isImportedWithDefault(importPath: ImportPath, contextFile: KtFile): Boolean

    abstract fun isImportedWithLowPriorityDefaultImport(importPath: ImportPath, contextFile: KtFile): Boolean

    abstract fun mayImportOnShortenReferences(descriptor: DeclarationDescriptor): Boolean

    abstract val importSortComparator: Comparator<ImportPath>

    abstract fun importDescriptor(file: KtFile, descriptor: DeclarationDescriptor, forceAllUnderImport: Boolean = false): ImportDescriptorResult

    companion object {
        @JvmStatic fun getInstance(project: Project): ImportInsertHelper
            = ServiceManager.getService<ImportInsertHelper>(project, ImportInsertHelper::class.java)
    }
}

enum class ImportDescriptorResult {
    FAIL,
    IMPORT_ADDED,
    ALREADY_IMPORTED
}

