#!/usr/bin/env node
/**
 * @fileoverview
 * Updates the CDN URLs in the README.md to match the major version in the
 * NPM package manifest. Does nothing if the README.md is already up-to-date.
 */

const fs = require("fs");
const path = require("path");

const rootDir = path.resolve(__dirname, "..");
const packageJsonFile = path.resolve(rootDir, "package.json");
const readmeFile = path.resolve(rootDir, "README.md");

function getMajorVersion(semVerVersion) {
  const majorVersionAsString = semVerVersion.split('.')[0];
  return parseInt(majorVersionAsString);
}

function getManifest() {
  const manifestRaw = fs.readFileSync(packageJsonFile).toString();
  return JSON.parse(manifestRaw);
}

function updateVersionInReadmeIfNecessary(majorVersion) {
  let content = fs.readFileSync(readmeFile).toString();

  content = content.replace(
    /simple-icons@v[0-9]+/g,
    `simple-icons@v${majorVersion}`,
  );

  fs.writeFileSync(readmeFile, content);
}

function main() {
  try {
    const manifest = getManifest();
    const majorVersion = getMajorVersion(manifest.version);
    updateVersionInReadmeIfNecessary(majorVersion);
  } catch (error) {
    console.error("Failed to update CDN version number:", error);
    process.exit(1);
  }
}

main();