/*
 * Copyright 2010-2025 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.analysis.api.descriptors.symbols.psiBased

import org.jetbrains.kotlin.analysis.api.base.KaContextReceiver
import org.jetbrains.kotlin.analysis.api.descriptors.Fe10AnalysisContext
import org.jetbrains.kotlin.analysis.api.descriptors.symbols.calculateHashCode
import org.jetbrains.kotlin.analysis.api.descriptors.symbols.descriptorBased.KaFe10DescValueParameterSymbol
import org.jetbrains.kotlin.analysis.api.descriptors.symbols.descriptorBased.base.createContextReceivers
import org.jetbrains.kotlin.analysis.api.descriptors.symbols.descriptorBased.base.ktVisibility
import org.jetbrains.kotlin.analysis.api.descriptors.symbols.descriptorBased.base.toKtReceiverParameterSymbol
import org.jetbrains.kotlin.analysis.api.descriptors.symbols.descriptorBased.base.toKtType
import org.jetbrains.kotlin.analysis.api.descriptors.symbols.isEqualTo
import org.jetbrains.kotlin.analysis.api.descriptors.symbols.pointers.KaFe10NeverRestoringSymbolPointer
import org.jetbrains.kotlin.analysis.api.descriptors.symbols.psiBased.base.KaFe10PsiSymbol
import org.jetbrains.kotlin.analysis.api.descriptors.symbols.psiBased.base.createErrorType
import org.jetbrains.kotlin.analysis.api.descriptors.symbols.psiBased.base.ktVisibility
import org.jetbrains.kotlin.analysis.api.descriptors.utils.cached
import org.jetbrains.kotlin.analysis.api.impl.base.symbols.pointers.KaBasePsiSymbolPointer
import org.jetbrains.kotlin.analysis.api.lifetime.withValidityAssertion
import org.jetbrains.kotlin.analysis.api.symbols.KaAnonymousFunctionSymbol
import org.jetbrains.kotlin.analysis.api.symbols.KaContextParameterSymbol
import org.jetbrains.kotlin.analysis.api.symbols.KaReceiverParameterSymbol
import org.jetbrains.kotlin.analysis.api.symbols.KaValueParameterSymbol
import org.jetbrains.kotlin.analysis.api.symbols.pointers.KaSymbolPointer
import org.jetbrains.kotlin.analysis.api.types.KaType
import org.jetbrains.kotlin.descriptors.FunctionDescriptor
import org.jetbrains.kotlin.descriptors.Visibilities
import org.jetbrains.kotlin.descriptors.Visibility
import org.jetbrains.kotlin.psi.KtFunctionLiteral
import org.jetbrains.kotlin.psi.psiUtil.isExtensionDeclaration
import org.jetbrains.kotlin.resolve.BindingContext

internal class KaFe10PsiLiteralAnonymousFunctionSymbol(
    override val psi: KtFunctionLiteral,
    override val analysisContext: Fe10AnalysisContext
) : KaAnonymousFunctionSymbol(), KaFe10PsiSymbol<KtFunctionLiteral, FunctionDescriptor> {
    override val descriptor: FunctionDescriptor? by cached {
        val bindingContext = analysisContext.analyze(psi)
        bindingContext[BindingContext.FUNCTION, psi]
    }

    override val valueParameters: List<KaValueParameterSymbol>
        get() = withValidityAssertion {
            return if (psi.valueParameters.isNotEmpty()) {
                psi.valueParameters.map { KaFe10PsiValueParameterSymbol(it, analysisContext) }
            } else {
                // There might be implicit 'it'
                descriptor?.valueParameters.orEmpty().map { KaFe10DescValueParameterSymbol(it, analysisContext) }
            }
        }

    override val compilerVisibility: Visibility
        get() = withValidityAssertion { psi.ktVisibility ?: descriptor?.ktVisibility ?: Visibilities.Public }

    override val returnType: KaType
        get() = withValidityAssertion {
            descriptor?.returnType?.toKtType(analysisContext) ?: createErrorType()
        }

    override val receiverParameter: KaReceiverParameterSymbol?
        get() = withValidityAssertion {
            descriptor?.extensionReceiverParameter?.toKtReceiverParameterSymbol(analysisContext)
        }

    override val contextReceivers: List<KaContextReceiver>
        get() = withValidityAssertion { descriptor?.createContextReceivers(analysisContext) ?: emptyList() }

    override val contextParameters: List<KaContextParameterSymbol>
        get() = withValidityAssertion { emptyList() }

    override val isExtension: Boolean
        get() = withValidityAssertion { psi.isExtensionDeclaration() }

    override fun createPointer(): KaSymbolPointer<KaAnonymousFunctionSymbol> = withValidityAssertion {
        KaBasePsiSymbolPointer.createForSymbolFromSource<KaAnonymousFunctionSymbol>(this) ?: KaFe10NeverRestoringSymbolPointer()
    }

    override fun equals(other: Any?): Boolean = isEqualTo(other)
    override fun hashCode(): Int = calculateHashCode()
}
