import * as z from "zod";

export const lunarisVersionSchema = z.string().regex(/^\d+(?:\.\d+)+$/u);

export interface LunarisVersionChange {
  previousVersion: string;
  targetVersion: string;
}

export function parseLunarisVersionChange(
  message: string,
): LunarisVersionChange | null {
  const match = message.match(
    /^Version Change:\s*(\d+(?:\.\d+)+)\s*→\s*(\d+(?:\.\d+)+)\s*$/imu,
  );
  if (!match) return null;
  return {
    previousVersion: lunarisVersionSchema.parse(match[1]),
    targetVersion: lunarisVersionSchema.parse(match[2]),
  };
}

export function compareLunarisVersions(left: string, right: string): number {
  const leftParts = lunarisVersionSchema.parse(left).split(".").map(Number);
  const rightParts = lunarisVersionSchema.parse(right).split(".").map(Number);
  const length = Math.max(leftParts.length, rightParts.length);

  for (let index = 0; index < length; index += 1) {
    const difference = (leftParts[index] ?? 0) - (rightParts[index] ?? 0);
    if (difference !== 0) return Math.sign(difference);
  }
  return 0;
}