/*
 * 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.analysis.api.descriptors.symbols.psiBased

import org.jetbrains.kotlin.analysis.api.descriptors.Fe10AnalysisContext
import org.jetbrains.kotlin.analysis.api.descriptors.Fe10AnalysisFacade.AnalysisMode
import org.jetbrains.kotlin.analysis.api.descriptors.symbols.calculateHashCode
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.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.KaLocalVariableSymbol
import org.jetbrains.kotlin.analysis.api.symbols.pointers.KaSymbolPointer
import org.jetbrains.kotlin.analysis.api.types.KaType
import org.jetbrains.kotlin.descriptors.VariableDescriptor
import org.jetbrains.kotlin.lexer.KtTokens
import org.jetbrains.kotlin.name.Name
import org.jetbrains.kotlin.name.SpecialNames
import org.jetbrains.kotlin.psi.KtVariableDeclaration
import org.jetbrains.kotlin.resolve.BindingContext

internal class KaFe10PsiLocalVariableSymbol(
    override val psi: KtVariableDeclaration,
    override val analysisContext: Fe10AnalysisContext
) : KaLocalVariableSymbol(), KaFe10PsiSymbol<KtVariableDeclaration, VariableDescriptor> {
    override val descriptor: VariableDescriptor? by cached {
        val bindingContext = analysisContext.analyze(psi, AnalysisMode.PARTIAL)
        bindingContext[BindingContext.VARIABLE, psi]
    }

    override val name: Name
        get() = withValidityAssertion {
            when {
                psi.nameIdentifier?.text == "_" -> SpecialNames.UNDERSCORE_FOR_UNUSED_VAR
                else -> psi.nameAsSafeName
            }
        }

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

    override val isVal: Boolean
        get() = withValidityAssertion { !psi.isVar }

    override val isLateInit: Boolean
        get() = withValidityAssertion { psi.hasModifier(KtTokens.LATEINIT_KEYWORD) }

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

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