/**
 * @typdef {Object} PackageInfo
 * @property {string} packageName - the name of the package
 * @property {string} packageVersion - the version of the package
 */

/**
 * Parses the given package string into a package name and version
 * @param {string} packageString - a string representing a package name
 *                                 and version (e.g. package@1.0.0)
 * @returns {PackageInfo} - an object containing the package name and package version
 */
function parsePackageString(packageString) {
    // Package scope and package name both can have
    // letters, numbers, dots, hyphens, and underscores.
    // However, they cannot start with dots or underscores
    const packageScopeMatcher = /@[\w\d-]+[\w\d._-]*/;
    const packageNameMatcher = /[\w\d-]+[\w\d._-]*/;
    // The version number may start with a comparator (^, ~, etc) and
    // can contain digits, letters, dots, or dashes (e.g. bootstrap@4.0.0-beta
    // contains all of those characters)
    // Alternatively, it may be a dist tag (e.g. latest, next)
    const packageVersionMatcher = /([\^~v><=]|(>=|<=))?[\d\w.-]+/;
    const packageStringMatcher = new RegExp(
        `((${packageScopeMatcher.source})?/?` + `(${packageNameMatcher.source}))(@` + `(${packageVersionMatcher.source}))?`
    );
    const parsed = packageString.match(packageStringMatcher);

    // According to regexper, name is the first capturing
    // group and version is the fifth
    const packageName = parsed[1];
    let packageVersion = parsed[5];

    if (packageVersion === "undefined") {
        packageVersion = "latest";
    }

    return {
        packageName,
        packageVersion,
    };
}

// eslint-disable-next-line import/prefer-default-export
export {parsePackageString};