/*
 * Copyright 2010-2017 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.quickfix

import com.intellij.codeInsight.intention.IntentionAction
import com.intellij.openapi.editor.Editor
import com.intellij.openapi.project.Project
import org.jetbrains.kotlin.descriptors.PropertyDescriptor
import org.jetbrains.kotlin.diagnostics.Diagnostic
import org.jetbrains.kotlin.idea.caches.resolve.analyze
import org.jetbrains.kotlin.idea.search.usagesSearch.descriptor
import org.jetbrains.kotlin.lexer.KtTokens
import org.jetbrains.kotlin.psi.KtAnnotationEntry
import org.jetbrains.kotlin.psi.KtExpression
import org.jetbrains.kotlin.psi.KtFile
import org.jetbrains.kotlin.psi.KtProperty
import org.jetbrains.kotlin.psi.psiUtil.getParentOfType
import org.jetbrains.kotlin.resolve.checkers.ConstModifierChecker
import org.jetbrains.kotlin.resolve.constants.evaluate.ConstantExpressionEvaluator
import org.jetbrains.kotlin.resolve.lazy.BodyResolveMode


class ReplaceJvmFieldWithConstFix(annotation: KtAnnotationEntry) : KotlinQuickFixAction<KtAnnotationEntry>(annotation) {
    override fun getText(): String = "Replace '@JvmField' with 'const'"

    override fun getFamilyName(): String = text

    override fun invoke(project: Project, editor: Editor?, file: KtFile) {
        val property = element?.getParentOfType<KtProperty>(false) ?: return
        element?.delete()
        property.addModifier(KtTokens.CONST_KEYWORD)
    }

    companion object : KotlinSingleIntentionActionFactory() {
        override fun createAction(diagnostic: Diagnostic): IntentionAction? {
            val annotation = diagnostic.psiElement as? KtAnnotationEntry ?: return null
            val property = annotation.getParentOfType<KtProperty>(false) ?: return null
            val propertyDescriptor = property.descriptor as? PropertyDescriptor ?: return null
            if (!ConstModifierChecker.canBeConst(property, property, propertyDescriptor)) {
                return null
            }

            val initializer = property.initializer ?: return null
            if (!initializer.isConstantExpression()) {
                return null
            }

            return ReplaceJvmFieldWithConstFix(annotation)
        }

        private fun KtExpression.isConstantExpression() =
                ConstantExpressionEvaluator.getConstant(this, analyze(BodyResolveMode.PARTIAL))?.let {
                    !it.usesNonConstValAsConstant
                } ?: false
    }
}