import crypto from "node:crypto";
import fs from "node:fs";
import path from "node:path";
import { resolveAppRoot } from "../lib/paths";

const DEFAULT_CONFIG_NAME = "triggershell.yml";

export interface InitOptions {
  port: number;
  auth: boolean;
  force: boolean;
}

export async function initCommand(
  targetPath: string | undefined,
  opts: InitOptions,
): Promise<void> {
  const targetDir = path.resolve(process.cwd(), targetPath ?? ".");
  fs.mkdirSync(targetDir, { recursive: true });
  const configPath = path.join(targetDir, DEFAULT_CONFIG_NAME);

  if (fs.existsSync(configPath) && !opts.force) {
    console.error(`${configPath} already exists. Use --force to overwrite.`);
    process.exitCode = 1;
    return;
  }

  const templatePath = path.join(
    resolveAppRoot(),
    "templates",
    DEFAULT_CONFIG_NAME,
  );
  const template = fs.readFileSync(templatePath, "utf-8");
  const rendered = template
    .replace("__PORT__", String(opts.port))
    .replace("__AUTH_ENABLED__", opts.auth ? "true" : "false");
  fs.writeFileSync(configPath, rendered);
  console.log(`Created ${configPath}`);

  const envPath = path.join(targetDir, ".env");
  if (opts.auth) {
    if (fs.existsSync(envPath)) {
      console.log(
        `${envPath} already exists - make sure it sets TRIGGERSHELL_SESSION_SECRET (>= 32 chars).`,
      );
    } else {
      const sessionSecret = crypto.randomBytes(32).toString("hex");
      fs.writeFileSync(
        envPath,
        `TRIGGERSHELL_SESSION_SECRET=${sessionSecret}\n`,
      );
      console.log(`Created ${envPath} (keep this out of version control)`);
    }
    console.log(
      "\nAuth is enabled but no users are configured yet. Add one with:",
    );
    console.log(`  triggershell users add <username> --config ${configPath}`);
  }

  console.log("\nStart the app with:");
  console.log(`  triggershell start --config ${configPath}`);
}