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/*
 * Copyright 2010-2024 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.ir.util

import org.jetbrains.kotlin.descriptors.CallableMemberDescriptor
import org.jetbrains.kotlin.descriptors.FunctionDescriptor
import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
import org.jetbrains.kotlin.ir.declarations.DescriptorMetadataSource
import org.jetbrains.kotlin.ir.declarations.IrDeclarationOrigin
import org.jetbrains.kotlin.ir.declarations.IrSimpleFunction
import org.jetbrains.kotlin.ir.symbols.IrSimpleFunctionSymbol
import org.jetbrains.kotlin.resolve.descriptorUtil.isEffectivelyExternal
import org.jetbrains.kotlin.utils.memoryOptimizedMap

@ObsoleteDescriptorBasedAPI
fun SymbolTable.declareSimpleFunctionWithOverrides(
    startOffset: Int,
    endOffset: Int,
    origin: IrDeclarationOrigin,
    descriptor: FunctionDescriptor
) =
    descriptorExtension.declareSimpleFunction(descriptor) {
        with(descriptor) {
            irFactory.createSimpleFunction(
                startOffset = startOffset,
                endOffset = endOffset,
                origin = origin,
                name = nameProvider.nameForDeclaration(this),
                visibility = visibility,
                isInline = isInline,
                isExpect = isExpect,
                returnType = null,
                modality = modality,
                symbol = it,
                isTailrec = isTailrec,
                isSuspend = isSuspend,
                isOperator = isOperator,
                isInfix = isInfix,
                isExternal = isEffectivelyExternal(),
                isFakeOverride = descriptor.kind == CallableMemberDescriptor.Kind.FAKE_OVERRIDE
            ).also { declaration ->
                declaration.metadata = DescriptorMetadataSource.Function(this)
            }
        }
    }.also { declaration ->
        generateOverriddenFunctionSymbols(declaration, this)
    }

@ObsoleteDescriptorBasedAPI
fun generateOverriddenFunctionSymbols(
    declaration: IrSimpleFunction,
    symbolTable: ReferenceSymbolTable
) {
    declaration.overriddenSymbols = declaration.descriptor.overriddenDescriptors.memoryOptimizedMap {
        symbolTable.descriptorExtension.referenceSimpleFunction(it.original)
    }
}