import { exec, spawn } from "child_process";
import fs from "fs";

const logsPath = `./scripts/logs`;
const logPath = `${logsPath}/factorio-update.log`;
if (!fs.existsSync(logsPath)) fs.mkdirSync(logsPath);
if (fs.existsSync(logPath)) fs.rmSync(logPath);
/** Log command output to separate log file to minimize console output */
function logDebug(msg: string): void {
  fs.appendFileSync(logPath, msg);
}

async function runCommand(command: string, args?: string[]): Promise<number | null> {
  return new Promise((resolve, reject) => {
    const proc = spawn(command, args);
    proc.stdout.on("data", (data: string) => {
      logDebug(data);
    });
    proc.stderr.on("data", (data: string) => {
      logDebug(data);
    });
    proc.on("error", (code) => {
      reject(code);
    });
    proc.on("exit", (code) => {
      resolve(code);
    });
  });
}

const FACTORIO_BIN_PATH = `C:\\Program Files\\Factorio\\bin\\x64\\factorio.exe`;
/**
 * Dumps data.raw as JSON to the script output folder and exits.
 * the output are genereate in Factorio data folder under script-output/.
 * more at https://wiki.factorio.com/Command_line_parameters
 * @returns
 */
export const dumpFactorioData = async () => {
  await runCommand(FACTORIO_BIN_PATH, ["--dump-data"]);
  await waitForFactorio(true, 10000);
  await waitForFactorio(false, 30000);
};
/**
 * Dumps all prototypes name and description (if they have a valid value) to the script output folder and exits.
 * the output are genereate in Factorio data folder under script-output.
 * more at https://wiki.factorio.com/Command_line_parameters
 * @returns
 */
export const dumpFactorioLocale = async () => {
  await runCommand(FACTORIO_BIN_PATH, ["--dump-prototype-locale"]);
  await waitForFactorio(true, 10000);
  await waitForFactorio(false, 30000);
};
export const dumpFactorioIcon = async () => {
  await runCommand(FACTORIO_BIN_PATH, ["--dump-icon-sprites"]);
  await waitForFactorio(true, 10000);
  await waitForFactorio(false, 60000);
};

/** Check whether Factorio is running after a delay */
export async function checkIfFactorioIsRunning(delayMs = 1000): Promise<boolean> {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      exec("tasklist", (err, stdout, _) => {
        if (err != null) reject(err);
        resolve(stdout.toLowerCase().includes("factorio.exe"));
      });
    }, delayMs);
  });
}

/**
 * Wait for factorio.exe to exit, since the image dump continues to run after
 * the batch script exits.
 */
async function waitForFactorio(running: boolean, waitMs: number): Promise<void> {
  const start = Date.now();
  let result = false;
  let runtime = 0;
  do {
    result = await checkIfFactorioIsRunning();
    runtime = Date.now() - start;
  } while (result !== running && runtime < waitMs);
  logDebug(`Waited ${runtime.toString()} for Factorio to ${running ? "start" : "exit"}\n`);
}