"""SystemVersion — OS and platform detection.

Ported from net.i2p.util.SystemVersion.
"""

import os
import platform
import struct
import sys


class SystemVersion:
    """Static utilities for detecting OS, architecture, and capabilities."""

    @staticmethod
    def get_os() -> str:
        s = platform.system().lower()
        if s == "darwin":
            return "mac"
        if s.startswith("win"):
            return "windows"
        return s  # "linux", "freebsd", etc.

    @staticmethod
    def get_arch() -> str:
        machine = platform.machine().lower()
        if machine in ("x86_64", "amd64"):
            return "amd64"
        if machine in ("aarch64", "arm64"):
            return "arm64"
        if machine.startswith("arm"):
            return "arm"
        if machine in ("i386", "i686", "x86"):
            return "386"
        return "unknown"

    @staticmethod
    def is_windows() -> bool:
        return platform.system().lower().startswith("win")

    @staticmethod
    def is_mac() -> bool:
        return platform.system().lower() == "darwin"

    @staticmethod
    def is_linux() -> bool:
        return platform.system().lower() == "linux"

    @staticmethod
    def is_android() -> bool:
        return False  # Not applicable in CPython

    @staticmethod
    def is_arm() -> bool:
        return SystemVersion.get_arch() in ("arm", "arm64")

    @staticmethod
    def is_x86() -> bool:
        return SystemVersion.get_arch() in ("amd64", "386")

    @staticmethod
    def is_64bit() -> bool:
        return struct.calcsize("P") * 8 == 64

    @staticmethod
    def get_cores() -> int:
        return os.cpu_count() or 1

    @staticmethod
    def get_max_memory() -> int:
        """Approximate max memory in bytes."""
        try:
            import resource
            soft, hard = resource.getrlimit(resource.RLIMIT_AS)
            if hard > 0:
                return hard
        except (ImportError, ValueError):
            pass
        return 2 * 1024 * 1024 * 1024  # Default 2GB

    @staticmethod
    def is_slow() -> bool:
        return SystemVersion.get_arch() in ("arm",)

    @staticmethod
    def python_version() -> str:
        return platform.python_version()