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import lzstring from "lz-string";

import { LuaTarget } from "typescript-to-lua";

const example = `// Declare exposed API

type Vector = [number, number, number];

declare function findUnitsInRadius(this: void, center: Vector, radius: number): Unit[];

declare interface Unit {

isFriend(other: Unit): boolean;

givePoints(pointsAmount: number): void;

}

// Use declared API in code

function onAbilityCast(this: void, caster: Unit, targetLocation: Vector) {

const units = findUnitsInRadius(targetLocation, 500);

const friends = units.filter(unit => caster.isFriend(unit));

for (const friend of friends) {

friend.givePoints(50);

}

}

`;

const defaultTarget = LuaTarget.Lua54;

export function getInitialCode(): [string, LuaTarget] {

if (window.location.hash.startsWith("#src=")) {

const code = window.location.hash.replace("#src=", "").trim();

return [decodeURIComponent(code), defaultTarget];

}

if (window.location.hash.startsWith("#code/")) {

const code = window.location.hash.replace("#code/", "").trim();

if (code.includes("/")) {

const split = code.split("/");

return [lzstring.decompressFromEncodedURIComponent(split[1]) ?? "", split[0] as LuaTarget];

} else {

return [lzstring.decompressFromEncodedURIComponent(code) ?? "", defaultTarget];

}

}

return [example, defaultTarget];

}

function urlEncode(code: string, target: LuaTarget) {

return `${target}/${lzstring.compressToEncodedURIComponent(code)}`;

}

export function updateCodeHistory(code: string, target: LuaTarget) {

const hash = `code/${urlEncode(code, target)}`;

window.history.replaceState({}, "", `#${hash}`);

}

export function getPlaygroundUrlForCode(code: string, target: LuaTarget) {

return `/play/#code/${urlEncode(code, target)}`;

}