// Parallels Vm script supports OpenClaw repository automation.
import { die, run, say, warn } from "./host-command.ts";

const PRLCTL_STATUS_TIMEOUT_MS = 30_000;
const PRLCTL_TRANSITION_TIMEOUT_MS = 120_000;

interface PrlctlVmListItem {
  name?: string;
  status?: string;
}

export interface WaitForVmStatusOptions {
  probeTimeoutMs?: () => number | undefined;
}

export interface EnsureVmRunningOptions extends WaitForVmStatusOptions {
  transitionTimeoutMs?: () => number | undefined;
}

export function listVmNames(): string[] {
  return listVms()
    .map((item) => (item.name ?? "").trim())
    .filter(Boolean);
}

export function vmStatus(vmName: string, timeoutMs?: number): string {
  return listVms(timeoutMs).find((vm) => vm.name === vmName)?.status || "missing";
}

export function waitForVmStatus(
  vmName: string,
  expected: string,
  timeoutSeconds: number,
  options: WaitForVmStatusOptions = {},
): void {
  const deadline = Date.now() + timeoutSeconds * 1000;
  while (Date.now() < deadline) {
    const status = run("prlctl", ["status", vmName], {
      check: false,
      quiet: true,
      timeoutMs: options.probeTimeoutMs?.() ?? PRLCTL_STATUS_TIMEOUT_MS,
    }).stdout;
    if (status.includes(` ${expected}`)) {
      return;
    }
    run("sleep", ["1"], { quiet: true });
  }
  throw new Error(`VM ${vmName} did not reach ${expected}`);
}

export function ensureVmRunning(
  vmName: string,
  timeoutSeconds = 180,
  options: EnsureVmRunningOptions = {},
): void {
  const deadline = Date.now() + timeoutSeconds * 1000;
  while (Date.now() < deadline) {
    const status = vmStatus(vmName, options.probeTimeoutMs?.());
    if (status === "running") {
      return;
    }
    if (status === "stopped") {
      say(`Start ${vmName} before update phase`);
      run("prlctl", ["start", vmName], {
        quiet: true,
        timeoutMs: options.transitionTimeoutMs?.() ?? PRLCTL_TRANSITION_TIMEOUT_MS,
      });
    } else if (status === "suspended" || status === "paused") {
      say(`Resume ${vmName} before update phase`);
      run("prlctl", ["resume", vmName], {
        quiet: true,
        timeoutMs: options.transitionTimeoutMs?.() ?? PRLCTL_TRANSITION_TIMEOUT_MS,
      });
    } else if (status === "missing") {
      die(`VM not found before update phase: ${vmName}`);
    }
    run("sleep", ["5"], { quiet: true });
  }
  die(`VM did not become running before update phase: ${vmName}`);
}

export function resolveUbuntuVmName(requested: string, explicit = false): string {
  const names = listVmNames();
  if (names.includes(requested)) {
    return requested;
  }
  if (explicit) {
    die(`VM not found: ${requested}`);
  }
  const fallback =
    names
      .map((name) => ({ name, parts: parseUbuntuVersionParts(name) }))
      .filter((item): item is { name: string; parts: number[] } => Boolean(item.parts))
      .filter((item) => item.parts[0] >= 24)
      .toSorted((a, b) => compareVersions(b.parts, a.parts))[0]?.name ??
    names.find(isSafeUbuntuFallbackName);
  if (!fallback) {
    die(`VM not found: ${requested}`);
  }
  warn(`requested VM ${requested} not found; using ${fallback}`);
  return fallback;
}

export function resolveMacosVmName(requested: string, explicit = false): string {
  const names = listVmNames();
  if (names.includes(requested)) {
    return requested;
  }
  if (explicit) {
    die(`VM not found: ${requested}`);
  }
  const fallback = names.find((name) => name === "macOS");
  if (!fallback) {
    die(`VM not found: ${requested}; select a macOS VM explicitly`);
  }
  warn(`requested VM ${requested} not found; using ${fallback}`);
  return fallback;
}

function listVms(timeoutMs = PRLCTL_STATUS_TIMEOUT_MS): PrlctlVmListItem[] {
  return JSON.parse(
    run("prlctl", ["list", "--all", "--json"], {
      quiet: true,
      timeoutMs,
    }).stdout,
  ) as PrlctlVmListItem[];
}

function parseUbuntuVersionParts(name: string): number[] | undefined {
  const version = /ubuntu\s+(\d+(?:\.\d+)*)/i.exec(name)?.[1];
  const parts = version?.split(".").map((part) => Number(part));
  if (!parts?.every((part) => Number.isSafeInteger(part))) {
    return undefined;
  }
  return parts;
}

function isSafeUbuntuFallbackName(name: string): boolean {
  if (!/ubuntu/i.test(name)) {
    return false;
  }
  const hasVersion = /ubuntu\s+\d+(?:\.\d+)*/i.test(name);
  return !hasVersion || Boolean(parseUbuntuVersionParts(name));
}

function compareVersions(a: number[], b: number[]): number {
  for (let index = 0; index < Math.max(a.length, b.length); index++) {
    const diff = (a[index] ?? 0) - (b[index] ?? 0);
    if (diff !== 0) {
      return diff;
    }
  }
  return 0;
}