"use strict";

//! Calculate the percentage of games from node that we support
// Expects node-gamedig checkout out in git root /node-gamedig
// Expects the generic example to output a list of game IDs when no arguments are provided

import process from "node:process";
import { closeSync, openSync, writeSync } from "node:fs";
import { spawnSync } from "node:child_process";

const setOutput = (key, value) => {
  const file = openSync(process.env.GITHUB_OUTPUT, "a");
  writeSync(file, `${key}=${value}\n`);
  closeSync(file);
};

// Get node IDs
// NOTE: Here we directly import from games to avoid loading
//       unecessary parts of the library that would require us
//       to install dependencies.
import { games } from "../../../node-gamedig/lib/games.js";

const node_ids = new Set(Object.keys(games));
const node_total = node_ids.size;

// Get rust IDs

const command = spawnSync("cargo", [
  "run",
  "-p",
  "gamedig",
  "--example",
  "generic",
]);

if (command.status !== 0) {
  console.error(command.stderr.toString("utf8"));
  process.exit(1);
}

const rust_ids_pretty = command.stdout.toString("utf8");
const rust_ids = new Set(
  rust_ids_pretty
    .split("\n")
    .map((line) => line.split("\t")[0])
    .filter((id) => id.length > 0)
);

// Detect missing node IDs

for (const id of rust_ids) {
  if (node_ids.delete(id)) {
    rust_ids.delete(id);
  }
}

console.log("Node remains", node_ids);
console.log("Rust remains", rust_ids);

const percent = 1 - node_ids.size / node_total;

// Output percent to 2 decimal places
setOutput("percent", Math.round(percent * 10000) / 100);