// prepare.ts: get a val's directory ready to run on this VM.
//
//   deno run -A ~/vals-kit/prepare.ts ~/vals/<val>
//
// Adds to the val's deno.json (keeping what's there) the imports that send
// Val Town's std/sqlite, std/blob, std/email and std/openai to this kit,
// and "vendor": true, so other remote code is saved in the val's vendor/.
// Then lists every line that still depends on Val Town, and exits 1 if any.
const dir = Deno.args[0];
if (!dir) throw new Error("usage: prepare.ts <val dir>");
const kit = new URL(".", import.meta.url).pathname;
const imports = JSON.parse(await Deno.readTextFile(`${kit}imports.json`));
let config: Record<string, unknown> = {};
try {
  config = JSON.parse(await Deno.readTextFile(`${dir}/deno.json`));
} catch { /* none yet */ }
config.imports = { ...(config.imports as object ?? {}), ...imports };
config.vendor = true;
await Deno.writeTextFile(`${dir}/deno.json`, JSON.stringify(config, null, 2) + "\n");
console.log(`${dir}/deno.json: std imports mapped to ${kit}`);

const mapped = new Set(Object.keys(imports));
const watch = /esm\.town\/v\/|val\.run|valtown\.email|api\.val\.town|Deno\.env\.get\(["'](valtown|VAL_TOWN_API_KEY)["']\)|@valtown\/sdk/;
let left = 0;
async function scan(d: string) {
  for await (const e of Deno.readDir(d)) {
    const p = `${d}/${e.name}`;
    if (e.isDirectory) {
      if (![".git", "vendor", "node_modules", "data", ".vt"].includes(e.name)) await scan(p);
    } else if (/\.(ts|tsx|js|jsx|mjs|html)$/.test(e.name)) {
      (await Deno.readTextFile(p)).split("\n").forEach((line, i) => {
        const url = line.match(/["'](https:\/\/esm\.town\/v\/[^"']+)["']/)?.[1];
        if (watch.test(line) && !(url && mapped.has(url))) {
          left++;
          console.log(`${p.slice(dir.length + 1)}:${i + 1}: ${line.trim().slice(0, 120)}`);
        }
      });
    }
  }
}
await scan(dir);
console.log(left ? `\n${left} lines still use Val Town (see above)` : "nothing left that uses Val Town");
Deno.exit(left ? 1 : 0);