/*
 * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
 * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
 */

package org.jetbrains.kotlin.fir.analysis.checkers.declaration

import org.jetbrains.kotlin.KtFakeSourceElementKind
import org.jetbrains.kotlin.diagnostics.DiagnosticReporter
import org.jetbrains.kotlin.diagnostics.reportOn
import org.jetbrains.kotlin.fir.analysis.checkers.MppCheckerKind
import org.jetbrains.kotlin.fir.analysis.checkers.context.CheckerContext
import org.jetbrains.kotlin.fir.analysis.diagnostics.FirErrors
import org.jetbrains.kotlin.fir.declarations.FirSimpleFunction
import org.jetbrains.kotlin.fir.symbols.impl.FirClassSymbol
import org.jetbrains.kotlin.fir.symbols.impl.FirFileSymbol
import org.jetbrains.kotlin.name.SpecialNames

object FirFunctionNameChecker : FirSimpleFunctionChecker(MppCheckerKind.Common) {
    context(context: CheckerContext, reporter: DiagnosticReporter)
    override fun check(declaration: FirSimpleFunction) {
        val source = declaration.source
        if (source == null || source.kind is KtFakeSourceElementKind) return
        val containingDeclaration = context.containingDeclarations.lastOrNull()
        val isNonLocal = containingDeclaration is FirFileSymbol || containingDeclaration is FirClassSymbol<*>
        if (declaration.name == SpecialNames.NO_NAME_PROVIDED && isNonLocal) {
            reporter.reportOn(source, FirErrors.FUNCTION_DECLARATION_WITH_NO_NAME)
        }
    }
}
