// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { SemVer } from "./types.ts";
import { parseBuild, parseNumber, parsePrerelease } from "./_shared.ts";
import { FULL_REGEXP, MAX_LENGTH } from "./_shared.ts";

/**
 * Attempt to parse a string as a semantic version, returning either a `SemVer`
 * object or throws a TypeError.
 * @param version The version string to parse
 * @returns A valid SemVer
 */
export function parse(version: string): SemVer {
  if (typeof version !== "string") {
    throw new TypeError(
      `version must be a string`,
    );
  }

  if (version.length > MAX_LENGTH) {
    throw new TypeError(
      `version is longer than ${MAX_LENGTH} characters`,
    );
  }

  version = version.trim();

  const groups = version.match(FULL_REGEXP)?.groups;
  if (!groups) throw new TypeError(`Invalid Version: ${version}`);

  const major = parseNumber(groups.major, "Invalid major version");
  const minor = parseNumber(groups.minor, "Invalid minor version");
  const patch = parseNumber(groups.patch, "Invalid patch version");

  const prerelease = groups.prerelease
    ? parsePrerelease(groups.prerelease)
    : [];
  const build = groups.buildmetadata ? parseBuild(groups.buildmetadata) : [];

  return {
    major,
    minor,
    patch,
    prerelease,
    build,
  };
}