/** Target media-node version served from /install/media-node-linux-* */
export const MEDIA_NODE_TARGET_VERSION =
  process.env.MEDIA_NODE_VERSION?.trim() || "1.3.3";

/** Minimum node version that handles UPGRADE over WebSocket */
const REMOTE_UPGRADE_MIN_VERSION = "1.3.3";

function parseVersion(version: string): [number, number, number] {
  const parts = version.trim().split(".");
  return [
    Number.parseInt(parts[0] ?? "0", 10) || 0,
    Number.parseInt(parts[1] ?? "0", 10) || 0,
    Number.parseInt(parts[2] ?? "0", 10) || 0,
  ];
}

export function versionGte(version: string | null | undefined, min: string): boolean {
  if (!version?.trim()) return false;
  const [a0, a1, a2] = parseVersion(version);
  const [b0, b1, b2] = parseVersion(min);
  if (a0 !== b0) return a0 > b0;
  if (a1 !== b1) return a1 > b1;
  return a2 >= b2;
}

export function nodeSupportsRemoteUpgrade(version: string | null | undefined): boolean {
  return versionGte(version, REMOTE_UPGRADE_MIN_VERSION);
}

export function mediaNodeBinaryForArch(architecture: string | null | undefined): string {
  const arch = (architecture ?? "amd64").toLowerCase();
  if (arch === "arm64" || arch === "aarch64") {
    return "media-node-linux-arm64";
  }
  return "media-node-linux-amd64";
}

export function inferNodeAppdata(paths: string[]): {
  appdata: string;
  platform: "synology" | "unraid";
} {
  const isSynology = paths.some((p) => p.startsWith("/volume1"));
  return {
    appdata: isSynology ? "/volume1/docker/media-node" : "/mnt/user/appdata/media-node",
    platform: isSynology ? "synology" : "unraid",
  };
}

export function buildUpgradeCommand(
  masterUrl: string,
  paths: string[]
): { command: string; appdata: string; platform: "synology" | "unraid" } {
  const { appdata, platform } = inferNodeAppdata(paths);
  const command = `curl -fsSL ${masterUrl}/install/upgrade-node.sh | bash -s -- --appdata=${appdata}`;
  return { command, appdata, platform };
}