from __future__ import annotations

import asyncio
import base64
import inspect
import shlex
from dataclasses import asdict, dataclass, is_dataclass
from pathlib import Path
from typing import Any

from astrbot.api import logger

from ..olayer import FileSystemComponent, GUIComponent, PythonComponent, ShellComponent
from .base import ComputerBooter
from .cua_defaults import CUA_CONFIG_KEYS, CUA_DEFAULT_CONFIG
from .shipyard_search_file_util import search_files_via_shell

_POSIX_OS_TYPES = {"linux", "darwin", "macos"}
_CUA_SANDBOX_HEALTH_PROBE = "_astrbot_cua_ok_"

_CUA_BACKGROUND_LAUNCHER = """
import subprocess, sys, time

p = subprocess.Popen(
    ["sh", "-lc", sys.argv[1]],
    stdin=subprocess.DEVNULL,
    stdout=subprocess.DEVNULL,
    stderr=subprocess.DEVNULL,
    start_new_session=True,
)
sys.stdout.write(str(p.pid) + "\\n")
sys.stdout.flush()
time.sleep(0.2)
code = p.poll()
sys.exit(0 if code is None else code)
""".strip()


async def _maybe_await(value: Any) -> Any:
    if inspect.isawaitable(value):
        return await value
    return value


def build_cua_booter_kwargs(sandbox_cfg: dict[str, Any]) -> dict[str, Any]:
    return {
        name: sandbox_cfg.get(config_key, CUA_DEFAULT_CONFIG[name])
        for name, config_key in CUA_CONFIG_KEYS.items()
    }


async def _write_base64_via_shell(
    shell: ShellComponent,
    path: str,
    data: bytes,
) -> dict[str, Any]:
    encoded = base64.b64encode(data).decode("ascii")
    decoder = (
        "import base64,pathlib,sys; "
        "path=pathlib.Path(sys.argv[1]); "
        "path.parent.mkdir(parents=True, exist_ok=True); "
        "path.write_bytes(base64.b64decode(sys.stdin.read()))"
    )
    chunk_size = 60_000
    encoded_lines = "\n".join(
        encoded[index : index + chunk_size]
        for index in range(0, len(encoded), chunk_size)
    )
    return await shell.exec(
        f"python3 -c {shlex.quote(decoder)} {shlex.quote(path)} <<'EOF'\n"
        f"{encoded_lines}\nEOF"
    )


@dataclass(slots=True)
class ProcessResult:
    stdout: str
    stderr: str
    exit_code: int | None
    success: bool


def _maybe_model_dump(value: Any) -> dict[str, Any]:
    if isinstance(value, dict):
        return value
    if is_dataclass(value) and not isinstance(value, type):
        return asdict(value)
    model_dump = getattr(value, "model_dump", None)
    if callable(model_dump):
        dumped = model_dump()
        if isinstance(dumped, dict):
            return dumped
    dict_attr = getattr(value, "dict", None)
    if callable(dict_attr):
        dumped = dict_attr()
        if isinstance(dumped, dict):
            return dumped
    attr_payload = {
        key: getattr(value, key)
        for key in (
            "stdout",
            "stderr",
            "output",
            "error",
            "returncode",
            "return_code",
            "exit_code",
            "success",
        )
        if hasattr(value, key)
    }
    if attr_payload:
        return attr_payload
    return {}


def _slice_content_by_lines(
    content: str,
    *,
    offset: int | None = None,
    limit: int | None = None,
) -> str:
    lines = content.splitlines(keepends=True)
    start = 0 if offset is None else offset
    selected = lines[start:] if limit is None else lines[start : start + limit]
    return "".join(selected)


def _normalize_process_result(raw: Any) -> ProcessResult:
    """Best-effort normalization for the process shapes returned by CUA SDKs."""
    payload = _maybe_model_dump(raw)
    if not payload and isinstance(raw, str):
        payload = {"stdout": raw}

    def first_text(*keys: str) -> str:
        for key in keys:
            value = payload.get(key)
            if value is not None:
                return str(value)
        return ""

    stdout = first_text("stdout", "output")
    stderr = first_text("stderr", "error")
    exit_code = payload.get("exit_code")
    if exit_code is None:
        exit_code = payload.get("returncode")
    if exit_code is None:
        exit_code = payload.get("return_code")
    if exit_code is not None:
        try:
            exit_code = int(exit_code)
        except Exception:
            exit_code = None
    if exit_code is None:
        exit_code = 0 if not stderr else 1
    success = bool(payload.get("success", not stderr and exit_code in (0, None)))
    return ProcessResult(
        stdout=stdout,
        stderr=stderr,
        exit_code=exit_code,
        success=success,
    )


def _is_missing_python3_error(stderr: str) -> bool:
    lowered = stderr.lower()
    return "python3" in lowered and (
        "not found" in lowered
        or "command not found" in lowered
        or "no such file" in lowered
    )


def _python3_requirement_error(operation: str, stderr: str) -> str:
    return f"CUA {operation} requires python3 in the sandbox image: {stderr}"


def _normalize_with_python3_requirement(raw: Any, operation: str) -> ProcessResult:
    proc = _normalize_process_result(raw)
    if proc.stderr and _is_missing_python3_error(proc.stderr):
        return ProcessResult(
            stdout=proc.stdout,
            stderr=_python3_requirement_error(operation, proc.stderr),
            exit_code=proc.exit_code,
            success=proc.success,
        )
    return proc


async def _exec_python3_or_error(
    shell: ShellComponent,
    code: str,
    *,
    operation: str,
    timeout: int | None = 30,
) -> ProcessResult:
    result = await shell.exec(f"python3 - <<'PY'\n{code}\nPY", timeout=timeout)
    return _normalize_with_python3_requirement(result, operation)


def _is_posix_os_type(os_type: str) -> bool:
    return os_type.lower() in _POSIX_OS_TYPES


def _posix_fs_error_message(os_type: str) -> str:
    return (
        "CUA filesystem shell fallback is only supported for POSIX images; "
        f"os_type={os_type!r} does not support the required shell commands."
    )


def _non_posix_filesystem_result(path: str, os_type: str) -> dict[str, Any]:
    error = _posix_fs_error_message(os_type)
    return {"success": False, "path": path, "error": error, "message": error}


def _raise_non_posix_filesystem_error(os_type: str) -> None:
    raise RuntimeError(_posix_fs_error_message(os_type))


def _resolve_component_method(
    component: Any,
    method_names: str | tuple[str, ...],
) -> Any | None:
    if component is None:
        return None
    names = (method_names,) if isinstance(method_names, str) else method_names
    for method_name in names:
        method = getattr(component, method_name, None)
        if method is not None:
            return method
    return None


def _missing_component_method_error(
    component_name: str,
    method_names: str | tuple[str, ...],
) -> RuntimeError:
    names = (method_names,) if isinstance(method_names, str) else method_names
    candidates = ", ".join(f"{component_name}.{name}" for name in names)
    return RuntimeError(
        f"CUA sandbox does not provide any of: {candidates}. "
        "Please check the installed CUA SDK version and sandbox backend."
    )


def _has_component_method(root: Any, component_name: str, method_name: str) -> bool:
    component = getattr(root, component_name, None)
    return getattr(component, method_name, None) is not None


def _resolve_files_components(sandbox: Any) -> tuple[Any, ...]:
    components: list[Any] = []
    seen_ids: set[int] = set()
    for name in ("files", "filesystem"):
        component = getattr(sandbox, name, None)
        if component is None:
            continue
        component_id = id(component)
        if component_id in seen_ids:
            continue
        seen_ids.add(component_id)
        components.append(component)
    return tuple(components)


def _resolve_files_method(
    components: tuple[Any, ...],
    method_names: str | tuple[str, ...],
) -> Any | None:
    for component in components:
        method = _resolve_component_method(component, method_names)
        if method is not None:
            return method
    return None


def _normalize_native_upload_result(raw: Any, file_name: str) -> dict[str, Any]:
    payload = _maybe_model_dump(raw)
    if not payload:
        return {"success": True, "file_path": file_name}
    if "file_path" not in payload and "path" not in payload:
        payload["file_path"] = file_name
    if "success" not in payload:
        payload["success"] = not bool(payload.get("error") or payload.get("stderr"))
    return payload


class CuaShellComponent(ShellComponent):
    def __init__(self, sandbox: Any, os_type: str = "linux") -> None:
        self._sandbox = sandbox
        self._os_type = os_type.lower()
        shell = sandbox.shell
        self._exec_raw = getattr(shell, "exec", None) or getattr(shell, "run", None)
        if self._exec_raw is None:
            raise RuntimeError("CUA sandbox shell must provide `.exec` or `.run`.")

    async def exec(
        self,
        command: str,
        cwd: str | None = None,
        env: dict[str, str] | None = None,
        timeout: int | None = 30,
        shell: bool = True,
        background: bool = False,
    ) -> dict[str, Any]:
        if not shell:
            return {
                "stdout": "",
                "stderr": "error: only shell mode is supported in CUA booter.",
                "exit_code": 2,
                "success": False,
            }

        kwargs: dict[str, Any] = {}
        if cwd is not None:
            kwargs["cwd"] = cwd
        if timeout is not None:
            kwargs["timeout"] = timeout
        if env:
            kwargs["env"] = env
        if background:
            if not _is_posix_os_type(self._os_type):
                return {
                    "stdout": "",
                    "stderr": "error: background shell execution is only supported for POSIX CUA images.",
                    "exit_code": 2,
                    "success": False,
                }
            command = _build_cua_background_command(command)

        result = await _maybe_await(self._exec_raw(command, **kwargs))
        proc = (
            _normalize_with_python3_requirement(result, "background execution")
            if background
            else _normalize_process_result(result)
        )
        response = {
            "stdout": proc.stdout,
            "stderr": proc.stderr,
            "exit_code": proc.exit_code,
            "success": proc.success,
        }
        if background:
            try:
                response["pid"] = int(proc.stdout.strip().splitlines()[-1])
            except Exception:
                response["pid"] = None
        return response


def _build_cua_background_command(command: str) -> str:
    return f"python3 -c {shlex.quote(_CUA_BACKGROUND_LAUNCHER)} {shlex.quote(command)}"


class CuaPythonComponent(PythonComponent):
    def __init__(self, sandbox: Any, os_type: str = "linux") -> None:
        self._sandbox = sandbox
        self._os_type = os_type
        python = getattr(sandbox, "python", None)
        self._python_exec = None
        if python is not None:
            self._python_exec = getattr(python, "exec", None) or getattr(
                python, "run", None
            )

    async def exec(
        self,
        code: str,
        kernel_id: str | None = None,
        timeout: int = 30,
        silent: bool = False,
    ) -> dict[str, Any]:
        _ = kernel_id
        if self._python_exec is not None:
            result = await _maybe_await(self._python_exec(code, timeout=timeout))
            proc = _normalize_process_result(result)
        else:
            shell = CuaShellComponent(self._sandbox, os_type=self._os_type)
            proc = await _exec_python3_or_error(
                shell,
                code,
                operation="Python execution fallback",
                timeout=timeout,
            )

        output_text = "" if silent else proc.stdout
        error_text = proc.stderr
        return {
            "success": proc.success if not silent else not bool(error_text),
            "data": {
                "output": {"text": output_text, "images": []},
                "error": error_text,
            },
            "output": output_text,
            "error": error_text,
        }


def _write_result(path: str, result: dict[str, Any]) -> dict[str, Any]:
    stderr = result.get("stderr", "")
    if stderr and _is_missing_python3_error(stderr):
        result = {
            **result,
            "stderr": _python3_requirement_error("filesystem write fallback", stderr),
        }
    if result.get("stderr") or result.get("success") is False:
        return {"success": False, "path": path, **result}
    return {"success": True, "path": path, **result}


class CuaFileSystemComponent(FileSystemComponent):
    def __init__(
        self, sandbox: Any, os_type: str = CUA_DEFAULT_CONFIG["os_type"]
    ) -> None:
        self._shell = CuaShellComponent(sandbox, os_type=os_type)
        self._fs_components = _resolve_files_components(sandbox)
        self._os_type = os_type.lower()
        self._fallback = _PosixShellFileSystem(self._shell, self._os_type)

    async def create_file(
        self,
        path: str,
        content: str = "",
        mode: int = 0o644,
    ) -> dict[str, Any]:
        write_result = await self.write_file(path, content)
        if not write_result.get("success"):
            return {**write_result, "mode": mode, "mode_applied": False}
        return {"success": True, "path": path, "mode": mode, "mode_applied": False}

    async def read_file(
        self,
        path: str,
        encoding: str = "utf-8",
        offset: int | None = None,
        limit: int | None = None,
    ) -> dict[str, Any]:
        read_file = _resolve_files_method(
            self._fs_components, ("read_file", "read_text")
        )
        if read_file is None:
            return await self._fallback.read_file(path, encoding, offset, limit)
        else:
            content = await _maybe_await(read_file(path))
        if isinstance(content, bytes):
            content = content.decode(encoding, errors="replace")
        return {
            "success": True,
            "path": path,
            "content": _slice_content_by_lines(
                str(content), offset=offset, limit=limit
            ),
        }

    async def write_file(
        self,
        path: str,
        content: str,
        mode: str = "w",
        encoding: str = "utf-8",
    ) -> dict[str, Any]:
        _ = mode
        write_file = _resolve_files_method(
            self._fs_components, ("write_file", "write_text")
        )
        if write_file is None:
            return await self._fallback.write_file(path, content, mode, encoding)
        else:
            await _maybe_await(write_file(path, content))
        return {"success": True, "path": path}

    async def delete_file(self, path: str) -> dict[str, Any]:
        delete = _resolve_files_method(
            self._fs_components, ("delete", "delete_file", "remove")
        )
        if delete is None:
            return await self._fallback.delete_file(path)
        else:
            await _maybe_await(delete(path))
        return {"success": True, "path": path}

    async def list_dir(
        self,
        path: str = ".",
        show_hidden: bool = False,
    ) -> dict[str, Any]:
        list_dir = _resolve_files_method(self._fs_components, ("list_dir", "list"))
        if list_dir is not None:
            entries = await _maybe_await(list_dir(path))
            return {"success": True, "path": path, "entries": entries}
        return await self._fallback.list_dir(path, show_hidden)

    async def search_files(
        self,
        pattern: str,
        path: str | None = None,
        glob: str | None = None,
        after_context: int | None = None,
        before_context: int | None = None,
    ) -> dict[str, Any]:
        return await self._fallback.search_files(
            pattern=pattern,
            path=path,
            glob=glob,
            after_context=after_context,
            before_context=before_context,
        )

    async def edit_file(
        self,
        path: str,
        old_string: str,
        new_string: str,
        replace_all: bool = False,
        encoding: str = "utf-8",
    ) -> dict[str, Any]:
        read_result = await self.read_file(path, encoding=encoding)
        if not read_result.get("success"):
            return read_result
        content = read_result.get("content", "")
        occurrences = content.count(old_string)
        if occurrences == 0:
            return {
                "success": False,
                "error": "old string not found in file",
                "replacements": 0,
            }
        updated = content.replace(old_string, new_string, -1 if replace_all else 1)
        write_result = await self.write_file(path, updated, encoding=encoding)
        if not write_result.get("success"):
            return write_result
        return {
            "success": True,
            "path": path,
            "replacements": occurrences if replace_all else 1,
        }


class _PosixShellFileSystem(FileSystemComponent):
    def __init__(self, shell: CuaShellComponent, os_type: str) -> None:
        self._shell = shell
        self._os_type = os_type.lower()

    def _ensure_posix(self, path: str) -> dict[str, Any] | None:
        if _is_posix_os_type(self._os_type):
            return None
        return _non_posix_filesystem_result(path, self._os_type)

    async def read_file(
        self,
        path: str,
        encoding: str = "utf-8",
        offset: int | None = None,
        limit: int | None = None,
    ) -> dict[str, Any]:
        _ = encoding
        if error := self._ensure_posix(path):
            return error
        result = await self._shell.exec(f"cat {shlex.quote(path)}")
        if result.get("stderr"):
            return {"success": False, "path": path, "error": result["stderr"]}
        return {
            "success": True,
            "path": path,
            "content": _slice_content_by_lines(
                str(result.get("stdout", "")), offset=offset, limit=limit
            ),
        }

    async def write_file(
        self,
        path: str,
        content: str,
        mode: str = "w",
        encoding: str = "utf-8",
    ) -> dict[str, Any]:
        _ = mode
        if error := self._ensure_posix(path):
            return error
        result = await _write_base64_via_shell(
            self._shell, path, content.encode(encoding)
        )
        return _write_result(path, result)

    async def delete_file(self, path: str) -> dict[str, Any]:
        if error := self._ensure_posix(path):
            return error
        result = await self._shell.exec(f"rm -rf {shlex.quote(path)}")
        if result.get("stderr"):
            return {"success": False, "path": path, "error": result["stderr"]}
        return {"success": True, "path": path}

    async def list_dir(
        self,
        path: str = ".",
        show_hidden: bool = False,
    ) -> dict[str, Any]:
        if error := self._ensure_posix(path):
            return error
        return await _list_dir_via_shell(self._shell, path, show_hidden)

    async def search_files(
        self,
        pattern: str,
        path: str | None = None,
        glob: str | None = None,
        after_context: int | None = None,
        before_context: int | None = None,
    ) -> dict[str, Any]:
        search_path = path or "."
        if error := self._ensure_posix(search_path):
            return error
        return await search_files_via_shell(
            self._shell,
            pattern=pattern,
            path=path,
            glob=glob,
            after_context=after_context,
            before_context=before_context,
        )


async def _list_dir_via_shell(
    shell: CuaShellComponent,
    path: str,
    show_hidden: bool,
) -> dict[str, Any]:
    flags = "-1A" if show_hidden else "-1"
    result = await shell.exec(f"ls {flags} {shlex.quote(path)}")
    stdout = result.get("stdout", "")
    return {
        "success": not bool(result.get("stderr")),
        "path": path,
        "entries": [line for line in stdout.splitlines() if line.strip()],
        "error": result.get("stderr", ""),
    }


class CuaGUIComponent(GUIComponent):
    def __init__(self, sandbox: Any) -> None:
        self._sandbox = sandbox
        mouse = getattr(sandbox, "mouse", None)
        keyboard = getattr(sandbox, "keyboard", None)
        self._click = _resolve_component_method(mouse, "click")
        self._type_text = _resolve_component_method(keyboard, "type")
        self._press_key = _resolve_component_method(
            keyboard, ("press", "key_press", "press_key")
        )

    async def screenshot(self, path: str | None = None) -> dict[str, Any]:
        raw = await self._sandbox.screenshot()
        data = _screenshot_to_bytes(raw)
        if path:
            Path(path).parent.mkdir(parents=True, exist_ok=True)
            Path(path).write_bytes(data)
        return {
            "success": True,
            "path": path,
            "mime_type": "image/png",
            "base64": base64.b64encode(data).decode("ascii"),
        }

    async def click(self, x: int, y: int, button: str = "left") -> dict[str, Any]:
        if self._click is None:
            raise _missing_component_method_error("mouse", "click")
        result = await _maybe_await(self._click(x, y, button=button))
        payload = _maybe_model_dump(result)
        return {"success": bool(payload.get("success", True)), **payload}

    async def type_text(self, text: str) -> dict[str, Any]:
        if self._type_text is None:
            raise _missing_component_method_error("keyboard", "type")
        result = await _maybe_await(self._type_text(text))
        payload = _maybe_model_dump(result)
        return {"success": bool(payload.get("success", True)), **payload}

    async def press_key(self, key: str) -> dict[str, Any]:
        if self._press_key is None:
            raise _missing_component_method_error(
                "keyboard", ("press", "key_press", "press_key")
            )
        result = await _maybe_await(self._press_key(key))
        payload = _maybe_model_dump(result)
        return {"success": bool(payload.get("success", True)), **payload}


def _screenshot_to_bytes(raw: Any) -> bytes:
    def from_str(value: str) -> bytes:
        if value.startswith("data:image"):
            value = value.split(",", 1)[1]
        try:
            return base64.b64decode(value, validate=True)
        except Exception:
            candidate = Path(value)
            if candidate.is_file():
                return candidate.read_bytes()
            return value.encode("utf-8")

    if isinstance(raw, (bytes, bytearray)):
        return bytes(raw)
    if isinstance(raw, str):
        return from_str(raw)
    if hasattr(raw, "save"):
        import io

        output = io.BytesIO()
        raw.save(output, format="PNG")
        return output.getvalue()
    payload = _maybe_model_dump(raw)
    for key in ("data", "base64", "image"):
        value = payload.get(key)
        if value:
            return _screenshot_to_bytes(value)
    raise TypeError(f"Unsupported CUA screenshot result: {type(raw)!r}")


@dataclass(slots=True)
class _CuaRuntime:
    sandbox_cm: Any
    sandbox: Any
    shell: CuaShellComponent
    python: CuaPythonComponent
    fs: CuaFileSystemComponent
    gui: CuaGUIComponent | None


class CuaBooter(ComputerBooter):
    def __init__(
        self,
        image: str = CUA_DEFAULT_CONFIG["image"],
        os_type: str = CUA_DEFAULT_CONFIG["os_type"],
        ttl: int = CUA_DEFAULT_CONFIG["ttl"],
        telemetry_enabled: bool = CUA_DEFAULT_CONFIG["telemetry_enabled"],
        local: bool = CUA_DEFAULT_CONFIG["local"],
        api_key: str = CUA_DEFAULT_CONFIG["api_key"],
    ) -> None:
        self.image = image
        self.os_type = os_type
        self.ttl = ttl
        self.telemetry_enabled = telemetry_enabled
        self.local = local
        self.api_key = api_key
        self._runtime: _CuaRuntime | None = None

    async def boot(self, session_id: str) -> None:
        _ = session_id
        try:
            from cua import Image, Sandbox
        except ImportError as exc:
            raise RuntimeError(
                "CUA sandbox support requires the optional `cua` package. "
                "Install it with `pip install cua` in the AstrBot environment."
            ) from exc

        image_obj = self._build_image(Image)
        ephemeral_kwargs = self._build_ephemeral_kwargs(Sandbox.ephemeral)
        sandbox_cm = Sandbox.ephemeral(image_obj, **ephemeral_kwargs)
        sandbox = await sandbox_cm.__aenter__()
        try:
            self._runtime = _CuaRuntime(
                sandbox_cm=sandbox_cm,
                sandbox=sandbox,
                shell=CuaShellComponent(sandbox, os_type=self.os_type),
                python=CuaPythonComponent(sandbox, os_type=self.os_type),
                fs=CuaFileSystemComponent(sandbox, os_type=self.os_type),
                gui=CuaGUIComponent(sandbox),
            )
        except Exception:
            await sandbox_cm.__aexit__(None, None, None)
            self._runtime = None
            raise
        logger.info(
            "[Computer] CUA sandbox booted: image=%s, os_type=%s",
            self.image,
            self.os_type,
        )

    def _build_image(self, image_cls: Any) -> Any:
        image_name = (self.image or self.os_type or "linux").strip().lower()
        factory = getattr(image_cls, image_name, None)
        if callable(factory):
            return factory()
        os_factory = getattr(image_cls, (self.os_type or "linux").strip().lower(), None)
        if callable(os_factory):
            return os_factory()
        return image_name

    def _build_ephemeral_kwargs(self, ephemeral: Any) -> dict[str, Any]:
        try:
            parameters = inspect.signature(ephemeral).parameters
        except (TypeError, ValueError):
            return {}
        kwargs: dict[str, Any] = {}
        if "ttl" in parameters:
            kwargs["ttl"] = self.ttl
        if "telemetry_enabled" in parameters:
            kwargs["telemetry_enabled"] = self.telemetry_enabled
        if "local" in parameters:
            kwargs["local"] = self.local
        if "api_key" in parameters and self.api_key:
            kwargs["api_key"] = self.api_key
        return kwargs

    async def shutdown(self) -> None:
        if self._runtime is not None:
            await self._runtime.sandbox_cm.__aexit__(None, None, None)
            self._runtime = None

    @property
    def capabilities(self) -> tuple[str, ...] | None:
        capabilities = ["python", "shell", "filesystem"]
        if self._runtime is None:
            return tuple(capabilities)

        sandbox = self._runtime.sandbox
        has_screenshot = getattr(sandbox, "screenshot", None) is not None
        has_mouse = _has_component_method(sandbox, "mouse", "click")
        has_keyboard = _has_component_method(sandbox, "keyboard", "type")
        if has_screenshot or has_mouse or has_keyboard:
            capabilities.append("gui")
        if has_screenshot:
            capabilities.append("screenshot")
        if has_mouse:
            capabilities.append("mouse")
        if has_keyboard:
            capabilities.append("keyboard")
        return tuple(capabilities)

    @property
    def fs(self) -> FileSystemComponent:
        if self._runtime is None:
            raise RuntimeError("CuaBooter is not initialized.")
        return self._runtime.fs

    @property
    def python(self) -> PythonComponent:
        if self._runtime is None:
            raise RuntimeError("CuaBooter is not initialized.")
        return self._runtime.python

    @property
    def shell(self) -> ShellComponent:
        if self._runtime is None:
            raise RuntimeError("CuaBooter is not initialized.")
        return self._runtime.shell

    @property
    def gui(self) -> GUIComponent | None:
        return None if self._runtime is None else self._runtime.gui

    async def upload_file(self, path: str, file_name: str) -> dict:
        local_path = Path(path)
        if not local_path.is_file():
            return {"success": False, "error": f"File not found: {path}"}
        sandbox = None if self._runtime is None else self._runtime.sandbox
        if sandbox is not None and hasattr(sandbox, "upload_file"):
            return _maybe_model_dump(
                await sandbox.upload_file(str(local_path), file_name)
            )
        files_components = () if sandbox is None else _resolve_files_components(sandbox)
        upload = _resolve_files_method(files_components, "upload")
        if upload is not None:
            result = await _maybe_await(upload(str(local_path), file_name))
            return _normalize_native_upload_result(result, file_name)
        write_bytes = _resolve_files_method(files_components, "write_bytes")
        if write_bytes is not None:
            result = await _maybe_await(write_bytes(file_name, local_path.read_bytes()))
            return _normalize_native_upload_result(result, file_name)
        if not _is_posix_os_type(self.os_type):
            return _non_posix_filesystem_result(file_name, self.os_type)
        result = await _write_base64_via_shell(
            self.shell, file_name, local_path.read_bytes()
        )
        return {
            "success": not bool(result.get("stderr")),
            "file_path": file_name,
            **result,
        }

    async def download_file(self, remote_path: str, local_path: str) -> None:
        sandbox = None if self._runtime is None else self._runtime.sandbox
        if sandbox is not None and hasattr(sandbox, "download_file"):
            await sandbox.download_file(remote_path, local_path)
            return
        if not _is_posix_os_type(self.os_type):
            _raise_non_posix_filesystem_error(self.os_type)
        result = await self.shell.exec(f"base64 {shlex.quote(remote_path)}")
        if result.get("stderr"):
            raise RuntimeError(result["stderr"])
        Path(local_path).parent.mkdir(parents=True, exist_ok=True)
        Path(local_path).write_bytes(base64.b64decode(result.get("stdout", "")))

    async def available(self) -> bool:
        if self._runtime is None:
            return False
        try:
            result = await self._runtime.shell.exec(
                f"echo {_CUA_SANDBOX_HEALTH_PROBE}", timeout=10
            )
        except asyncio.CancelledError:
            raise
        except Exception as exc:
            logger.debug("[Computer] CUA sandbox health check failed: %s", exc)
            return False
        if result.get("exit_code") != 0:
            return False
        return _CUA_SANDBOX_HEALTH_PROBE in str(result.get("stdout", ""))