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import * as path from "path";

import { EmitHost } from "./transpilation";

import * as lua from "./LuaAST";

import { LuaTarget } from "./CompilerOptions";

import { getOrUpdate } from "./utils";

export enum LuaLibFeature {

ArrayAt = "ArrayAt",

ArrayConcat = "ArrayConcat",

ArrayEntries = "ArrayEntries",

ArrayEvery = "ArrayEvery",

ArrayFill = "ArrayFill",

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",

ArrayToReversed = "ArrayToReversed",

ArrayToSorted = "ArrayToSorted",

ArrayToSpliced = "ArrayToSpliced",

ArrayWith = "ArrayWith",

Await = "Await",

Class = "Class",

ClassExtends = "ClassExtends",

CloneDescriptor = "CloneDescriptor",

CountVarargs = "CountVarargs",

Decorate = "Decorate",

DecorateLegacy = "DecorateLegacy",

DecorateParam = "DecorateParam",

Delete = "Delete",

DelegatedYield = "DelegatedYield",

DescriptorGet = "DescriptorGet",

DescriptorSet = "DescriptorSet",

Error = "Error",

FunctionBind = "FunctionBind",

Generator = "Generator",

InstanceOf = "InstanceOf",

InstanceOfObject = "InstanceOfObject",

Iterator = "Iterator",

LuaIteratorSpread = "LuaIteratorSpread",

Map = "Map",

MapGroupBy = "MapGroupBy",

Match = "Match",

MathAtan2 = "MathAtan2",

MathModf = "MathModf",

MathSign = "MathSign",

MathTrunc = "MathTrunc",

New = "New",

Number = "Number",

NumberIsFinite = "NumberIsFinite",

NumberIsInteger = "NumberIsInteger",

NumberIsNaN = "NumberIsNaN",

NumberParseInt = "ParseInt",

NumberParseFloat = "ParseFloat",

NumberToString = "NumberToString",

NumberToFixed = "NumberToFixed",

ObjectAssign = "ObjectAssign",

ObjectDefineProperty = "ObjectDefineProperty",

ObjectEntries = "ObjectEntries",

ObjectFromEntries = "ObjectFromEntries",

ObjectGetOwnPropertyDescriptor = "ObjectGetOwnPropertyDescriptor",

ObjectGetOwnPropertyDescriptors = "ObjectGetOwnPropertyDescriptors",

ObjectGroupBy = "ObjectGroupBy",

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",

Using = "Using",

UsingAsync = "UsingAsync",

}

export interface LuaLibFeatureInfo {

dependencies?: LuaLibFeature[];

exports: string[];

}

export type LuaLibModulesInfo = Record<LuaLibFeature, LuaLibFeatureInfo>;

export function resolveLuaLibDir(luaTarget: LuaTarget) {

const luaLibDir = luaTarget === LuaTarget.Lua50 ? "5.0" : "universal";

return path.resolve(__dirname, path.join("..", "dist", "lualib", luaLibDir));

}

export const luaLibModulesInfoFileName = "lualib_module_info.json";

const luaLibModulesInfo = new Map<LuaTarget, LuaLibModulesInfo>();

export function getLuaLibModulesInfo(luaTarget: LuaTarget, emitHost: EmitHost): LuaLibModulesInfo {

if (!luaLibModulesInfo.has(luaTarget)) {

const lualibPath = path.join(resolveLuaLibDir(luaTarget), luaLibModulesInfoFileName);

const result = emitHost.readFile(lualibPath);

if (result !== undefined) {

luaLibModulesInfo.set(luaTarget, JSON.parse(result) as LuaLibModulesInfo);

} else {

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

}

return luaLibModulesInfo.get(luaTarget)!;

}

// This caches the names of lualib exports to their LuaLibFeature, avoiding a linear search for every lookup

const lualibExportToFeature = new Map<LuaTarget, ReadonlyMap<string, LuaLibFeature>>();

export function getLuaLibExportToFeatureMap(

luaTarget: LuaTarget,

emitHost: EmitHost

): ReadonlyMap<string, LuaLibFeature> {

if (!lualibExportToFeature.has(luaTarget)) {

const luaLibModulesInfo = getLuaLibModulesInfo(luaTarget, emitHost);

const map = new Map<string, LuaLibFeature>();

for (const [feature, info] of Object.entries(luaLibModulesInfo)) {

for (const exportName of info.exports) {

map.set(exportName, feature as LuaLibFeature);

}

lualibExportToFeature.set(luaTarget, map);

}

return lualibExportToFeature.get(luaTarget)!;

}

const lualibFeatureCache = new Map<LuaTarget, Map<LuaLibFeature, string>>();

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

const featureMap = getOrUpdate(lualibFeatureCache, luaTarget, () => new Map());

if (!featureMap.has(feature)) {

const featurePath = path.join(resolveLuaLibDir(luaTarget), `${feature}.lua`);

const luaLibFeature = emitHost.readFile(featurePath);

if (luaLibFeature === undefined) {

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

}

featureMap.set(feature, luaLibFeature);

}

return featureMap.get(feature)!;

}

export function resolveRecursiveLualibFeatures(

features: Iterable<LuaLibFeature>,

luaTarget: LuaTarget,

emitHost: EmitHost,

luaLibModulesInfo: LuaLibModulesInfo = getLuaLibModulesInfo(luaTarget, 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>,

luaTarget: LuaTarget,

emitHost: EmitHost

): string {

return resolveRecursiveLualibFeatures(features, luaTarget, emitHost)

.map(feature => readLuaLibFeature(feature, luaTarget, emitHost))

.join("\n");

}

export function loadImportedLualibFeatures(

features: Iterable<LuaLibFeature>,

luaTarget: LuaTarget,

emitHost: EmitHost

): lua.Statement[] {

const luaLibModuleInfo = getLuaLibModulesInfo(luaTarget, emitHost);

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

if (imports.length === 0) {

return [];

}

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

lua.createStringLiteral("lualib_bundle"),

]);

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;

}

const luaLibBundleContent = new Map<string, string>();

export function getLuaLibBundle(luaTarget: LuaTarget, emitHost: EmitHost): string {

const lualibPath = path.join(resolveLuaLibDir(luaTarget), "lualib_bundle.lua");

if (!luaLibBundleContent.has(lualibPath)) {

const result = emitHost.readFile(lualibPath);

if (result !== undefined) {

luaLibBundleContent.set(lualibPath, result);

} else {

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

}

return luaLibBundleContent.get(lualibPath) as string;

}

export function getLualibBundleReturn(exportedValues: string[]): string {

return `\nreturn {\n${exportedValues.map(exportName => ` ${exportName} = ${exportName}`).join(",\n")}\n}\n`;

}

export function buildMinimalLualibBundle(

features: Iterable<LuaLibFeature>,

luaTarget: LuaTarget,

emitHost: EmitHost

): string {

const code = loadInlineLualibFeatures(features, luaTarget, emitHost);

const moduleInfo = getLuaLibModulesInfo(luaTarget, emitHost);

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

return code + getLualibBundleReturn(exports);

}

export function findUsedLualibFeatures(

luaTarget: LuaTarget,

emitHost: EmitHost,

luaContents: string[]

): Set<LuaLibFeature> {

const features = new Set<LuaLibFeature>();

const exportToFeatureMap = getLuaLibExportToFeatureMap(luaTarget, emitHost);

for (const lua of luaContents) {

const regex = /^local (\w+) = ____lualib\.(\w+)$/gm;

while (true) {

const match = regex.exec(lua);

if (!match) break;

const [, localName, exportName] = match;

if (localName !== exportName) continue;

const feature = exportToFeatureMap.get(exportName);

if (feature) features.add(feature);

}

return features;

}