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import * as path from "path";

import { EmitHost } from "./transpilation";

import * as lua from "./LuaAST";

export enum LuaLibFeature {

ArrayConcat = "ArrayConcat",

ArrayEntries = "ArrayEntries",

ArrayEvery = "ArrayEvery",

ArrayFilter = "ArrayFilter",

ArrayForEach = "ArrayForEach",

ArrayFind = "ArrayFind",

ArrayFindIndex = "ArrayFindIndex",

ArrayFrom = "ArrayFrom",

ArrayIncludes = "ArrayIncludes",

ArrayIndexOf = "ArrayIndexOf",

ArrayIsArray = "ArrayIsArray",

ArrayJoin = "ArrayJoin",

ArrayMap = "ArrayMap",

ArrayPush = "ArrayPush",

ArrayPushArray = "ArrayPushArray",

ArrayReduce = "ArrayReduce",

ArrayReduceRight = "ArrayReduceRight",

ArrayReverse = "ArrayReverse",

ArrayUnshift = "ArrayUnshift",

ArraySort = "ArraySort",

ArraySlice = "ArraySlice",

ArraySome = "ArraySome",

ArraySplice = "ArraySplice",

ArrayToObject = "ArrayToObject",

ArrayFlat = "ArrayFlat",

ArrayFlatMap = "ArrayFlatMap",

ArraySetLength = "ArraySetLength",

Await = "Await",

Class = "Class",

ClassExtends = "ClassExtends",

CloneDescriptor = "CloneDescriptor",

Decorate = "Decorate",

DecorateParam = "DecorateParam",

Delete = "Delete",

DelegatedYield = "DelegatedYield",

Error = "Error",

FunctionBind = "FunctionBind",

Generator = "Generator",

InstanceOf = "InstanceOf",

InstanceOfObject = "InstanceOfObject",

Iterator = "Iterator",

Map = "Map",

MathAtan2 = "MathAtan2",

MathSign = "MathSign",

New = "New",

Number = "Number",

NumberIsFinite = "NumberIsFinite",

NumberIsNaN = "NumberIsNaN",

NumberToString = "NumberToString",

ObjectAssign = "ObjectAssign",

ObjectDefineProperty = "ObjectDefineProperty",

ObjectEntries = "ObjectEntries",

ObjectFromEntries = "ObjectFromEntries",

ObjectGetOwnPropertyDescriptor = "ObjectGetOwnPropertyDescriptor",

ObjectGetOwnPropertyDescriptors = "ObjectGetOwnPropertyDescriptors",

ObjectKeys = "ObjectKeys",

ObjectRest = "ObjectRest",

ObjectValues = "ObjectValues",

ParseFloat = "ParseFloat",

ParseInt = "ParseInt",

Promise = "Promise",

PromiseAll = "PromiseAll",

PromiseAllSettled = "PromiseAllSettled",

PromiseAny = "PromiseAny",

PromiseRace = "PromiseRace",

Set = "Set",

SetDescriptor = "SetDescriptor",

SparseArrayNew = "SparseArrayNew",

SparseArrayPush = "SparseArrayPush",

SparseArraySpread = "SparseArraySpread",

WeakMap = "WeakMap",

WeakSet = "WeakSet",

SourceMapTraceBack = "SourceMapTraceBack",

Spread = "Spread",

StringAccess = "StringAccess",

StringCharAt = "StringCharAt",

StringCharCodeAt = "StringCharCodeAt",

StringEndsWith = "StringEndsWith",

StringIncludes = "StringIncludes",

StringPadEnd = "StringPadEnd",

StringPadStart = "StringPadStart",

StringReplace = "StringReplace",

StringReplaceAll = "StringReplaceAll",

StringSlice = "StringSlice",

StringSplit = "StringSplit",

StringStartsWith = "StringStartsWith",

StringSubstr = "StringSubstr",

StringSubstring = "StringSubstring",

StringTrim = "StringTrim",

StringTrimEnd = "StringTrimEnd",

StringTrimStart = "StringTrimStart",

Symbol = "Symbol",

SymbolRegistry = "SymbolRegistry",

TypeOf = "TypeOf",

Unpack = "Unpack",

}

export interface LuaLibFeatureInfo {

dependencies?: LuaLibFeature[];

exports: string[];

}

export type LuaLibModulesInfo = Record<LuaLibFeature, LuaLibFeatureInfo>;

export const luaLibModulesInfoFileName = "lualib_module_info.json";

let luaLibModulesInfo: LuaLibModulesInfo | undefined;

export function getLuaLibModulesInfo(emitHost: EmitHost): LuaLibModulesInfo {

if (luaLibModulesInfo === undefined) {

const lualibPath = path.resolve(__dirname, `../dist/lualib/${luaLibModulesInfoFileName}`);

const result = emitHost.readFile(lualibPath);

if (result !== undefined) {

luaLibModulesInfo = JSON.parse(result) as LuaLibModulesInfo;

} else {

throw new Error(`Could not load lualib dependencies from '${lualibPath}'`);

}

}

return luaLibModulesInfo;

}

export function readLuaLibFeature(feature: LuaLibFeature, emitHost: EmitHost): string {

const featurePath = path.resolve(__dirname, `../dist/lualib/${feature}.lua`);

const luaLibFeature = emitHost.readFile(featurePath);

if (luaLibFeature === undefined) {

throw new Error(`Could not load lualib feature from '${featurePath}'`);

}

return luaLibFeature;

}

export function resolveRecursiveLualibFeatures(

features: Iterable<LuaLibFeature>,

emitHost: EmitHost,

luaLibModulesInfo: LuaLibModulesInfo = getLuaLibModulesInfo(emitHost)

): LuaLibFeature[] {

const loadedFeatures = new Set<LuaLibFeature>();

const result: LuaLibFeature[] = [];

function load(feature: LuaLibFeature): void {

if (loadedFeatures.has(feature)) return;

loadedFeatures.add(feature);

const dependencies = luaLibModulesInfo[feature]?.dependencies;

if (dependencies) {

dependencies.forEach(load);

}

result.push(feature);

}

for (const feature of features) {

load(feature);

}

return result;

}

export function loadInlineLualibFeatures(features: Iterable<LuaLibFeature>, emitHost: EmitHost): string {

let result = "";

for (const feature of resolveRecursiveLualibFeatures(features, emitHost)) {

const luaLibFeature = readLuaLibFeature(feature, emitHost);

result += luaLibFeature + "\n";

}

return result;

}

export function loadImportedLualibFeatures(features: Iterable<LuaLibFeature>, emitHost: EmitHost): lua.Statement[] {

const luaLibModuleInfo = getLuaLibModulesInfo(emitHost);

const imports = Array.from(features).flatMap(feature => luaLibModuleInfo[feature].exports);

const requireCall = lua.createCallExpression(lua.createIdentifier("require"), [

lua.createStringLiteral("lualib_bundle"),

]);

if (imports.length === 0) {

return [];

}

const luaLibId = lua.createIdentifier("____lualib");

const importStatement = lua.createVariableDeclarationStatement(luaLibId, requireCall);

const statements: lua.Statement[] = [importStatement];

// local <export> = ____luaLib.<export>

for (const item of imports) {

statements.push(

lua.createVariableDeclarationStatement(

lua.createIdentifier(item),

lua.createTableIndexExpression(luaLibId, lua.createStringLiteral(item))

)

);

}

return statements;

}

let luaLibBundleContent: string;

export function getLuaLibBundle(emitHost: EmitHost): string {

if (luaLibBundleContent === undefined) {

const lualibPath = path.resolve(__dirname, "../dist/lualib/lualib_bundle.lua");

const result = emitHost.readFile(lualibPath);

if (result !== undefined) {

luaLibBundleContent = result;

} else {

throw new Error(`Could not load lualib bundle from '${lualibPath}'`);

}

}

return luaLibBundleContent;

}