// Zero-dependency Node release-version contract shared by source and packaged entry points.
const NODE_RELEASE_VERSION_RE =
  /^v?((?:0|[1-9]\d*))\.((?:0|[1-9]\d*))\.((?:0|[1-9]\d*))(?:\+[0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*)?$/u;

const NODE_RELEASE_FLOORS = [
  { major: 24, minor: 16, patch: 0 },
  { major: 26, minor: 1, patch: 0 },
];
const HIGHEST_RELEASE_FLOOR = NODE_RELEASE_FLOORS[NODE_RELEASE_FLOORS.length - 1];

// Render diagnostics from the same release floors used by the runtime guard.
export const SUPPORTED_NODE_VERSIONS = `${NODE_RELEASE_FLOORS.map(
  ({ major, minor, patch }, index) =>
    `>=${major}.${minor}.${patch}${index < NODE_RELEASE_FLOORS.length - 1 ? ` <${major + 1}` : ""}`,
)
  .join(", ")
  .replace(/, ([^,]+)$/, ", or $1")} (Node 26 recommended)`;

export function formatUnsupportedNodeVersionMessage(version) {
  return [
    `Node ${version ?? "unknown"} is unsupported; OpenClaw requires ${SUPPORTED_NODE_VERSIONS}.`,
    "npm can finish installing OpenClaw without running its preinstall check; a successful install does not mean Node is supported.",
    "Re-run the installer: curl -fsSL https://openclaw.ai/install.sh | bash",
    "On Windows: iwr -useb https://openclaw.ai/install.ps1 | iex",
    "Or with nvm: nvm install 26 && nvm use 26 && nvm alias default 26",
    "Then rerun openclaw update. See https://docs.openclaw.ai/install/node",
  ].join("\n");
}

export function formatUnsupportedNodeDiagnosticWarning(version) {
  return `Running on an unsupported Node (${version}); diagnostics may show truncated text`;
}

const ROOT_BOOLEAN_OPTIONS = ["--dev", "--no-color"];
const ROOT_VALUE_OPTIONS = ["--profile", "--log-level", "--container"];

function consumeOption(args, index, booleanOptions, valueOptions) {
  const arg = args[index];
  if (booleanOptions.includes(arg)) {
    return 1;
  }
  const equals = arg.indexOf("=");
  if (valueOptions.includes(equals < 0 ? arg : arg.slice(0, equals))) {
    return equals >= 0 ? 1 : args[index + 1] === undefined ? 0 : 2;
  }
  return 0;
}

function diagnosticOptions(args, booleanOptions, valueOptions = []) {
  const flags = new Set();
  for (let index = 0; index < args.length;) {
    const consumed = consumeOption(
      args,
      index,
      [...ROOT_BOOLEAN_OPTIONS, ...booleanOptions],
      [...ROOT_VALUE_OPTIONS, ...valueOptions],
    );
    if (!consumed) {
      return null;
    }
    flags.add(args[index]);
    index += consumed;
  }
  return flags;
}

/** Shared by the packaged launcher and source guard before either loads command state. */
export function classifyUnsupportedNodeCommand(argv) {
  // On an unsupported runtime, a command may run only if it never opens a LIVE
  // OpenClaw database writable and never starts a Gateway or a repair agent.
  // Private-copy recovery is allowed; artifact-preserving readers never write the live file.
  const args = argv.slice(2);
  let index = 0;
  while (index < args.length) {
    const consumed = consumeOption(args, index, ROOT_BOOLEAN_OPTIONS, ROOT_VALUE_OPTIONS);
    if (!consumed) {
      break;
    }
    index += consumed;
  }
  const command = args[index++];
  const tail = args.slice(index);
  if (["--version", "-V", "-v", "--help", "-h"].includes(command)) {
    return diagnosticOptions(tail, []) ? "diagnostic" : null;
  }
  if (command === "gateway") {
    while (index < args.length) {
      const consumed = consumeOption(args, index, ROOT_BOOLEAN_OPTIONS, ROOT_VALUE_OPTIONS);
      if (!consumed) {
        break;
      }
      index += consumed;
    }
    return args[index] === "status" ? "diagnostic" : null;
  }
  if (command === "doctor") {
    return diagnosticOptions(
      tail,
      ["--lint", "--json", "--deep", "--all", "--non-interactive", "--no-workspace-suggestions"],
      ["--only", "--skip", "--severity-min"],
    )
      ? "diagnostic"
      : null;
  }
  if (command === "triage") {
    const flags = diagnosticOptions(
      tail,
      ["--json", "--non-interactive", "--no-export"],
      ["--update-result"],
    );
    return flags && (flags.has("--json") || flags.has("--non-interactive")) ? "diagnostic" : null;
  }
  if (command === "update") {
    while (index < args.length) {
      const consumed = consumeOption(args, index, ROOT_BOOLEAN_OPTIONS, ROOT_VALUE_OPTIONS);
      if (!consumed) {
        break;
      }
      index += consumed;
    }
    if (args[index] === "status") {
      return diagnosticOptions(args.slice(index + 1), ["--json"], ["--timeout"])
        ? "diagnostic"
        : null;
    }
    return diagnosticOptions(
      tail,
      ["--json", "--yes", "--dry-run", "--no-restart", "--accept-capabilities"],
      ["--channel", "--tag", "--timeout"],
    )
      ? "update"
      : null;
  }
  return null;
}

/** Diagnostic bundles target Node 22 syntax and require the native SQLite reader. */
export function canRunOpenClawNodeDiagnostics(value, hasNodeSqlite) {
  return (
    hasNodeSqlite &&
    isNodeVersionAtLeast(parseNodeReleaseVersion(value), { major: 22, minor: 0, patch: 0 })
  );
}

/** Parses an anchored release SemVer, allowing a leading v and valid build metadata. */
export function parseNodeReleaseVersion(value) {
  if (typeof value !== "string") {
    return null;
  }
  const match = NODE_RELEASE_VERSION_RE.exec(value.trim());
  if (!match) {
    return null;
  }
  const version = {
    major: Number(match[1]),
    minor: Number(match[2]),
    patch: Number(match[3]),
  };
  return Object.values(version).every(Number.isSafeInteger) ? version : null;
}

export function isNodeVersionAtLeast(version, minimum) {
  if (!version) {
    return false;
  }
  if (version.major !== minimum.major) {
    return version.major > minimum.major;
  }
  if (version.minor !== minimum.minor) {
    return version.minor > minimum.minor;
  }
  return version.patch >= minimum.patch;
}

/** Checks OpenClaw's supported release lines. Older Node lines with lossy SQLite TEXT reads are unsupported. */
export function isSupportedOpenClawNodeVersion(value) {
  const version = parseNodeReleaseVersion(value);
  if (!version) {
    return false;
  }
  const minimum = NODE_RELEASE_FLOORS.find((floor) => floor.major === version.major);
  return minimum
    ? isNodeVersionAtLeast(version, minimum)
    : version.major > HIGHEST_RELEASE_FLOOR.major;
}

function renderProcessNodeVersionCheck() {
  const patternSource = JSON.stringify(NODE_RELEASE_VERSION_RE.source);
  const releaseFloors = JSON.stringify(NODE_RELEASE_FLOORS);
  return `((value) => {
  if (typeof value !== "string") return false;
  const match = new RegExp(${patternSource}, "u").exec(value.trim());
  if (!match) return false;
  const version = { major: Number(match[1]), minor: Number(match[2]), patch: Number(match[3]) };
  if (!Object.values(version).every(Number.isSafeInteger)) return false;
  const floors = ${releaseFloors};
  const minimum = floors.find((floor) => floor.major === version.major);
  const atLeast = (floor) =>
    version.major > floor.major ||
    (version.major === floor.major &&
      (version.minor > floor.minor ||
        (version.minor === floor.minor && version.patch >= floor.patch)));
  return minimum ? atLeast(minimum) : version.major > floors[floors.length - 1].major;
})(process.versions.node)`;
}

// Worker bootstrap runs before OpenClaw is transferred. Carry the canonical
// release policy as a self-contained expression instead of a second parser.
export const PROCESS_NODE_VERSION_CHECK = renderProcessNodeVersionCheck();