#!/usr/bin/env node
const fs = require("fs");
let usage = `Usage: add-release.js PATH TAG [ASSETS...]

Updates the release list at PATH by adding a new release (if it does not exist)
with the provided TAG and list of ASSETS.`;

if (process.argv.length < 4) {
  console.log(usage);
  process.exit(2);
}

let path = process.argv[2];
let tag = process.argv[3];
let assets = process.argv.slice(4);

if (assets.length == 0) {
  console.error("Adding a release with no assets.");
}

function releaseAlreadyExists(root, tag) {
  let existing = root["releases"].find((release) => release["tag"] == tag);
  return existing !== undefined;
}

fs.readFile(path, "utf8", (err, data) => {
  if (err) {
    console.error(err);
    process.exit(2);
  }

  let root = JSON.parse(data);
  if (releaseAlreadyExists(root, tag)) {
    console.error(`Release '${tag}' already exists.`);
    console.error("No changes written.");
    process.exit(1);
  }

  let release = {
    tag: tag,
    assets: assets,
  };

  root["releases"].push(release);

  fs.writeFile(path, JSON.stringify(root, null, 1) + "\n", (err) => {
    if (err) {
      console.error(err);
      process.exit(2);
    } else {
      console.error(`Added release ${tag} with assets ${assets}.`);
    }
  });
});