#!/usr/bin/env node
import fs from "node:fs";
import net from "node:net";
import path from "node:path";

const cwd = process.cwd();
const nodecgRootPath = path.resolve(cwd, "lib", "nodecg");

const checks = [];

function addCheck(ok, title, details) {
  checks.push({ ok, title, details });
}

function parsePort(name, fallback) {
  const raw = process.env[name] ?? fallback;
  const parsed = Number.parseInt(raw, 10);
  if (!Number.isFinite(parsed) || parsed < 1 || parsed > 65535) {
    addCheck(false, `${name} invalid`, `It must be an integer between 1 and 65535. Received value: '${raw}'.`);
    return null;
  }

  addCheck(true, `${name} valid`, `${parsed}`);
  return parsed;
}

function parseIntInRange(name, fallback, min, max) {
  const raw = process.env[name] ?? String(fallback);
  const parsed = Number.parseInt(raw, 10);
  if (!Number.isFinite(parsed) || parsed < min || parsed > max) {
    addCheck(false, `${name} invalid`, `It must be an integer between ${min} and ${max}. Received value: '${raw}'.`);
    return;
  }

  addCheck(true, `${name} valid`, `${parsed}`);
}

function checkNodecgInstall() {
  const indexPath = path.join(nodecgRootPath, "index.js");
  const bootstrapPath = path.join(nodecgRootPath, "node_modules", "nodecg", "dist", "server", "bootstrap.js");
  const manifestPath = path.join(nodecgRootPath, ".scoreko-runtime.json");
  const bundleName = (process.env.NODECG_BUNDLE_NAME ?? "scoreko-dev").trim();
  const bundlePath = path.join(nodecgRootPath, "bundles", bundleName);

  addCheck(fs.existsSync(nodecgRootPath), "Packaged NodeCG runtime", nodecgRootPath);
  addCheck(fs.existsSync(indexPath), "Runtime index.js", indexPath);
  addCheck(fs.existsSync(bootstrapPath), "NodeCG bootstrap", bootstrapPath);
  addCheck(fs.existsSync(manifestPath), "Runtime manifest", manifestPath);
  addCheck(fs.existsSync(bundlePath), `Packaged bundle '${bundleName}'`, bundlePath);

  try {
    fs.accessSync(nodecgRootPath, fs.constants.R_OK | fs.constants.W_OK);
    addCheck(true, "lib/nodecg permissions", "Read/write OK for local development");
  } catch {
    addCheck(false, "lib/nodecg permissions", "No read/write permissions in lib/nodecg");
  }
}

function checkPortAvailability(port) {
  return new Promise((resolve) => {
    const server = net.createServer();

    server.once("error", () => {
      addCheck(false, `Port ${port}`, "It is in use. Free it or change NODECG_PORT.");
      resolve();
    });

    server.listen(port, "127.0.0.1", () => {
      server.close(() => {
        addCheck(true, `Port ${port}`, "Available");
        resolve();
      });
    });
  });
}

async function main() {
  const port = parsePort("NODECG_PORT", "9090");
  parseIntInRange("ELECTRON_LOAD_DELAY_MS", 10000, 0, 600000);
  parseIntInRange("NODECG_STARTUP_TIMEOUT_MS", 30000, 1000, 600000);
  parseIntInRange("NODECG_KILL_TIMEOUT_MS", 2500, 0, 120000);
  checkNodecgInstall();

  if (port) {
    await checkPortAvailability(port);
  }

  for (const check of checks) {
    const icon = check.ok ? "OK" : "FAIL";
    console.log(`${icon} ${check.title}: ${check.details}`);
  }

  const hasFailures = checks.some((check) => !check.ok);
  if (hasFailures) {
    process.exitCode = 1;
    return;
  }

  console.log("\nDoctor finished: valid configuration.");
}

main();