import { readFileSync } from "node:fs";
import { join } from "node:path";

const DEV_VERSION_SENTINEL = "0.0.0-dev";

function readPackageVersion(): string | undefined {
  try {
    const pkgPath = join(
      import.meta.dirname ?? __dirname,
      "..",
      "package.json",
    );
    const pkg = JSON.parse(readFileSync(pkgPath, "utf-8"));
    if (pkg.version && typeof pkg.version === "string") {
      return pkg.version;
    }
  } catch {
    // package.json missing or unreadable
  }
  return undefined;
}

function resolveVersion(): string {
  const envVersion = process.env.APP_VERSION;

  if (envVersion && envVersion !== DEV_VERSION_SENTINEL) {
    return envVersion;
  }

  return readPackageVersion() ?? DEV_VERSION_SENTINEL;
}

export const APP_VERSION: string = resolveVersion();

// Commit SHA is embedded at compile time via --define in CI.
// Falls back to "unknown" for local development.
function resolveCommitSha(): string {
  const sha = process.env.COMMIT_SHA;
  if (!sha || sha === "unknown") {
    return "unknown";
  }
  return sha;
}

export const COMMIT_SHA: string = resolveCommitSha();