const fs = require("fs");

const changelogText = fs.readFileSync("CHANGELOG.md", "utf8");
const pkg = JSON.parse(fs.readFileSync("package.json", "utf8"));

const changelogLines = changelogText.split("\n");

for (const line of changelogLines) {
  if (line.startsWith(`## [${pkg.version}]`)) {
    const re = new RegExp(`## \\[${pkg.version}\\] - \\d{4}-\\d{2}-\\d{2}`);
    const isMatch = re.test(line);
    if (isMatch) {
      process.exit(0);
    } else {
      console.error(
        `Found entry for version v${pkg.version}, ` +
          `but it must be on format: ## [${pkg.version}] - YYYY-MM-DD`
      );
    }
  }
}

console.error(
  `Could not find a changelog entry for version v${pkg.version} in CHANGELOG.md`
);
process.exit(1);