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/*
 * Copyright 2010-2020 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.wasm.ir

import org.jetbrains.kotlin.wasm.ir.source.location.SourceLocation


class WasmModule(
    val functionTypes: List = emptyList(),
    val recGroupTypes: List = emptyList(),
    val importsInOrder: List = emptyList(),
    val importedFunctions: List = emptyList(),
    val importedMemories: List = emptyList(),
    val importedTables: List = emptyList(),
    val importedGlobals: List = emptyList(),
    val importedTags: List = emptyList(),

    val definedFunctions: List = emptyList(),
    val tables: List = emptyList(),
    val memories: List = emptyList(),
    val globals: List = emptyList(),
    val exports: List> = emptyList(),
    val elements: List = emptyList(),
    val tags: List = emptyList(),

    val startFunction: WasmFunction? = null,

    val data: List = emptyList(),
    val dataCount: Boolean = true,
)

sealed class WasmNamedModuleField {
    var id: Int? = null
    open val name: String = ""
}

sealed class WasmFunction(
    override val name: String,
    val type: WasmSymbolReadOnly
) : WasmNamedModuleField() {
    class Defined(
        name: String,
        type: WasmSymbolReadOnly,
        val locals: MutableList = mutableListOf(),
        val instructions: MutableList = mutableListOf()
    ) : WasmFunction(name, type)

    class Imported(
        name: String,
        type: WasmSymbolReadOnly,
        val importPair: WasmImportDescriptor
    ) : WasmFunction(name, type)
}

class WasmMemory(
    val limits: WasmLimits,
    val importPair: WasmImportDescriptor? = null,
) : WasmNamedModuleField()

sealed class WasmDataMode {
    class Active(
        val memoryIdx: Int,
        val offset: MutableList
    ) : WasmDataMode() {
        constructor(memoryIdx: Int, offset: Int) : this(memoryIdx, mutableListOf().also> {
            WasmExpressionBuilder(it).buildConstI32(offset, SourceLocation.NoLocation("Offset value for WasmDataMode.Active "))
        })
    }

    object Passive : WasmDataMode()
}

class WasmData(
    val mode: WasmDataMode,
    val bytes: ByteArray,
) : WasmNamedModuleField()

class WasmTable(
    var limits: WasmLimits = WasmLimits(1u, null),
    val elementType: WasmType,
    val importPair: WasmImportDescriptor? = null
) : WasmNamedModuleField() {

    sealed class Value {
        class Function(val function: WasmSymbol) : Value() {
            constructor(function: WasmFunction) : this(WasmSymbol(function))
        }

        class Expression(val expr: List) : Value()
    }

}

class WasmElement(
    val type: WasmType,
    val values: List,
    val mode: Mode,
) : WasmNamedModuleField() {
    sealed class Mode {
        object Passive : Mode()
        class Active(val table: WasmTable, val offset: List) : Mode()
        object Declarative : Mode()
    }
}

class WasmTag(
    val type: WasmFunctionType,
    val importPair: WasmImportDescriptor? = null
) : WasmNamedModuleField() {
    init {
        assert(type.resultTypes.isEmpty()) { "Must have empty return as per current spec" }
    }
}

class WasmLocal(
    val id: Int,
    val name: String,
    val type: WasmType,
    val isParameter: Boolean
)

class WasmGlobal(
    override val name: String,
    val type: WasmType,
    val isMutable: Boolean,
    val init: List,
    val importPair: WasmImportDescriptor? = null
) : WasmNamedModuleField()

sealed class WasmExport(
    val name: String,
    val field: T,
    val kind: Byte,
    val keyword: String
) {
    class Function(name: String, field: WasmFunction) : WasmExport(name, field, 0x0, "func")
    class Table(name: String, field: WasmTable) : WasmExport(name, field, 0x1, "table")
    class Memory(name: String, field: WasmMemory) : WasmExport(name, field, 0x2, "memory")
    class Global(name: String, field: WasmGlobal) : WasmExport(name, field, 0x3, "global")
    class Tag(name: String, field: WasmTag) : WasmExport(name, field, 0x4, "tag")
}

sealed class WasmTypeDeclaration(
    override val name: String
) : WasmNamedModuleField()

data class WasmFunctionType(
    val parameterTypes: List,
    val resultTypes: List
) : WasmTypeDeclaration("")

class WasmStructDeclaration(
    name: String,
    val fields: List,
    val superType: WasmSymbolReadOnly?,
    val isFinal: Boolean
) : WasmTypeDeclaration(name)

class WasmArrayDeclaration(
    name: String,
    val field: WasmStructFieldDeclaration
) : WasmTypeDeclaration(name)

class WasmStructFieldDeclaration(
    val name: String,
    val type: WasmType,
    val isMutable: Boolean
)

sealed class WasmInstr(
    val operator: WasmOp,
    val immediates: List = emptyList()
) {
    abstract val location: SourceLocation?
}

class WasmInstrWithLocation(
    operator: WasmOp,
    immediates: List,
    override val location: SourceLocation
) : WasmInstr(operator, immediates) {
    constructor(
        operator: WasmOp,
        location: SourceLocation
    ) : this(operator, emptyList(), location)
}

class WasmInstrWithoutLocation(
    operator: WasmOp,
    immediates: List = emptyList(),
) : WasmInstr(operator, immediates) {
    override val location: SourceLocation? get() = null
}

data class WasmLimits(
    val minSize: UInt,
    val maxSize: UInt?
)

data class WasmImportDescriptor(
    val moduleName: String,
    val declarationName: WasmSymbolReadOnly
)