/**
 * Release Manager — Version Operations (RFC-0078)
 */

import type { Version, SemVerPart } from "./types.js";

export function parseVersion(str: string): Version {
	const cleaned = str.replace(/^v/, "");
	const [main, minor, rest] = cleaned.split(".");
	const patchPart = rest?.split("-")[0] ?? "0";
	return {
		major: parseInt(main ?? "0", 10),
		minor: parseInt(minor ?? "0", 10),
		patch: parseInt(patchPart ?? "0", 10),
		prerelease: rest?.includes("-")
			? rest.split("-").slice(1).join("-")
			: undefined,
	};
}

export function formatVersion(v: Version): string {
	let str = `${v.major}.${v.minor}.${v.patch}`;
	if (v.prerelease) str += `-${v.prerelease}`;
	if (v.build) str += `+${v.build}`;
	return str;
}

export function bumpVersion(v: Version, part: SemVerPart): Version {
	switch (part) {
		case "major":
			return { major: v.major + 1, minor: 0, patch: 0 };
		case "minor":
			return { major: v.major, minor: v.minor + 1, patch: 0 };
		case "patch":
			return { major: v.major, minor: v.minor, patch: v.patch + 1 };
	}
}

export function compareVersions(a: Version, b: Version): number {
	if (a.major !== b.major) return a.major - b.major;
	if (a.minor !== b.minor) return a.minor - b.minor;
	if (a.patch !== b.patch) return a.patch - b.patch;
	if (a.prerelease && !b.prerelease) return -1;
	if (!a.prerelease && b.prerelease) return 1;
	if (a.prerelease && b.prerelease)
		return a.prerelease.localeCompare(b.prerelease);
	return 0;
}

export function isPrerelease(v: Version): boolean {
	return !!v.prerelease;
}