#!/usr/bin/env node

/** 
 * @file
 * Run this to ensure that the lint exemptions are all valid.
 * If any of the exempt app files have been changed, this script will remove the exemption for that file.
 * 
 * Run it like this:
 * node bin/sync-lint-exemptions.mjs
 */

import fs from "node:fs/promises";

const exemptionsFilePath = "../apps/lint_exemptions.js";

const exemptions = (await import(exemptionsFilePath)).default;

for(const filePath of Object.keys(exemptions)){
    const fileContents = await fs.readFile("apps/" + filePath, "utf8");
    const currentHash = await hashContents(fileContents);
    if(exemptions[filePath].hash !== currentHash){
        delete exemptions[filePath];
        console.log(`! Removed lint exemptions for '${filePath}' because it has been edited`);
    }
}


const output = `module.exports = ${JSON.stringify(exemptions, undefined, 2)};\n`;
await fs.writeFile("bin/" + exemptionsFilePath, output);

console.log(`✔️ Synchronized all lint exemptions\n`);



/**
 * https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/digest#converting_a_digest_to_a_hex_string
 */
async function hashContents(message) {
    const msgUint8 = new TextEncoder().encode(message); // encode as (utf-8) Uint8Array
    const hashBuffer = await crypto.subtle.digest("SHA-256", msgUint8); // hash the message
    const hashArray = Array.from(new Uint8Array(hashBuffer)); // convert buffer to byte array
    const hashHex = hashArray
      .map((b) => b.toString(16).padStart(2, "0"))
      .join(""); // convert bytes to hex string
    return hashHex;
}