import { createHash } from "node:crypto";
import { readFile } from "node:fs/promises";
import { dirname, resolve } from "node:path";
import { fileURLToPath } from "node:url";

const projectRoot = resolve(dirname(fileURLToPath(import.meta.url)), "..");
const SOURCE_FILES = [
  "index.html",
  "styles.css",
  "app.js",
  "workers/asr-worker.js",
  "workers/llm-worker.js",
  "workers/tts-worker.js",
  "tools/run-ui-smoke.mjs",
  "tools/run-evidence-export-smoke.mjs",
  "tools/run-client-side-smoke.mjs",
  "tools/run-hosted-smoke.mjs",
  "tools/run-loopback-series.mjs",
  "tools/run-fake-mic-benchmark.mjs",
  "tools/run-local-candidate-benchmark.mjs",
  "tools/run-real-mic-series.mjs",
  "tools/run-hosted-evidence-capture.mjs",
  "tools/run-webgpu-benchmark.mjs",
  "tools/audit-browser-evidence.mjs",
  "tools/audit-validation.mjs",
  "tools/summarize-evidence.mjs",
  "tools/source-fingerprint.mjs",
];

export async function sourceFingerprint() {
  const fileFingerprints = [];
  const aggregate = createHash("sha256");
  for (const path of SOURCE_FILES) {
    const bytes = await readFile(resolve(projectRoot, path));
    const hash = createHash("sha256").update(bytes).digest("hex");
    fileFingerprints.push({ path, sha256: hash, bytes: bytes.length });
    aggregate.update(`${path}\0${hash}\0`);
  }
  return {
    algorithm: "sha256",
    hash: aggregate.digest("hex"),
    files: fileFingerprints,
  };
}