import asyncio
import logging
import sys
from abc import ABC, abstractmethod
from typing import Any, Dict, List, Optional, Tuple

logger = logging.getLogger(__name__)


class BaseAccessibilityHandler(ABC):
    """Abstract base class for OS-specific accessibility handlers."""

    @abstractmethod
    async def get_accessibility_tree(self) -> Dict[str, Any]:
        """Get the accessibility tree of the current window."""
        pass

    @abstractmethod
    async def find_element(
        self, role: Optional[str] = None, title: Optional[str] = None, value: Optional[str] = None
    ) -> Dict[str, Any]:
        """Find an element in the accessibility tree by criteria."""
        pass


class BaseFileHandler(ABC):
    """Abstract base class for OS-specific file handlers."""

    @abstractmethod
    async def file_exists(self, path: str) -> Dict[str, Any]:
        """Check if a file exists at the specified path."""
        pass

    @abstractmethod
    async def directory_exists(self, path: str) -> Dict[str, Any]:
        """Check if a directory exists at the specified path."""
        pass

    @abstractmethod
    async def list_dir(self, path: str) -> Dict[str, Any]:
        """List the contents of a directory."""
        pass

    @abstractmethod
    async def read_text(self, path: str) -> Dict[str, Any]:
        """Read the text contents of a file."""
        pass

    @abstractmethod
    async def write_text(self, path: str, content: str) -> Dict[str, Any]:
        """Write text content to a file."""
        pass

    @abstractmethod
    async def write_bytes(self, path: str, content_b64: str) -> Dict[str, Any]:
        """Write binary content to a file. Sent over the websocket as a base64 string."""
        pass

    @abstractmethod
    async def delete_file(self, path: str) -> Dict[str, Any]:
        """Delete a file."""
        pass

    @abstractmethod
    async def create_dir(self, path: str) -> Dict[str, Any]:
        """Create a directory."""
        pass

    @abstractmethod
    async def delete_dir(self, path: str) -> Dict[str, Any]:
        """Delete a directory."""
        pass

    @abstractmethod
    async def read_bytes(
        self, path: str, offset: int = 0, length: Optional[int] = None
    ) -> Dict[str, Any]:
        """Read the binary contents of a file. Sent over the websocket as a base64 string.

        Args:
            path: Path to the file
            offset: Byte offset to start reading from (default: 0)
            length: Number of bytes to read (default: None for entire file)
        """
        pass

    @abstractmethod
    async def get_file_size(self, path: str) -> Dict[str, Any]:
        """Get the size of a file in bytes."""
        pass


class BaseDesktopHandler(ABC):
    """Abstract base class for OS-specific desktop handlers.

    Categories:
    - Wallpaper Actions: Methods for wallpaper operations
    - Desktop shortcut actions: Methods for managing desktop shortcuts
    """

    # Wallpaper Actions
    @abstractmethod
    async def get_desktop_environment(self) -> Dict[str, Any]:
        """Get the current desktop environment name."""
        pass

    @abstractmethod
    async def set_wallpaper(self, path: str) -> Dict[str, Any]:
        """Set the desktop wallpaper to the file at path."""
        pass


class BaseWindowHandler(ABC):
    """Abstract class for OS-specific window management handlers.

    Categories:
    - Window Management: Methods for application/window control
    """

    # Window Management
    @abstractmethod
    async def open(self, target: str) -> Dict[str, Any]:
        """Open a file or URL with the default application."""
        pass

    @abstractmethod
    async def launch(self, app: str, args: Optional[List[str]] = None) -> Dict[str, Any]:
        """Launch an application with optional arguments."""
        pass

    @abstractmethod
    async def get_current_window_id(self) -> Dict[str, Any]:
        """Get the currently active window ID."""
        pass

    @abstractmethod
    async def get_application_windows(self, app: str) -> Dict[str, Any]:
        """Get windows belonging to an application (by name or bundle)."""
        pass

    @abstractmethod
    async def get_window_name(self, window_id: str) -> Dict[str, Any]:
        """Get the title/name of a window by ID."""
        pass

    @abstractmethod
    async def get_window_size(self, window_id: str | int) -> Dict[str, Any]:
        """Get the size of a window by ID as {width, height}."""
        pass

    @abstractmethod
    async def activate_window(self, window_id: str | int) -> Dict[str, Any]:
        """Bring a window to the foreground by ID."""
        pass

    @abstractmethod
    async def close_window(self, window_id: str | int) -> Dict[str, Any]:
        """Close a window by ID."""
        pass

    @abstractmethod
    async def get_window_position(self, window_id: str | int) -> Dict[str, Any]:
        """Get the top-left position of a window as {x, y}."""
        pass

    @abstractmethod
    async def set_window_size(
        self, window_id: str | int, width: int, height: int
    ) -> Dict[str, Any]:
        """Set the size of a window by ID."""
        pass

    @abstractmethod
    async def set_window_position(self, window_id: str | int, x: int, y: int) -> Dict[str, Any]:
        """Set the position of a window by ID."""
        pass

    @abstractmethod
    async def maximize_window(self, window_id: str | int) -> Dict[str, Any]:
        """Maximize a window by ID."""
        pass

    @abstractmethod
    async def minimize_window(self, window_id: str | int) -> Dict[str, Any]:
        """Minimize a window by ID."""
        pass


_SUPPORTED_FORMATS = {"png", "jpeg"}
_FORMAT_ALIASES = {"jpg": "jpeg"}


def normalize_screenshot_format(format: str, quality: int) -> tuple[str, int]:
    """Normalize and validate screenshot format/quality.

    Returns ``(normalized_format, clamped_quality)`` or raises ``ValueError``.

    - Lowercases the format string.
    - Maps "jpg" → "jpeg".
    - Rejects anything not in ``{"png", "jpeg"}``.
    - Clamps JPEG quality to 1–95 (silently caps values above 95).
    """
    fmt = _FORMAT_ALIASES.get(format.lower(), format.lower())
    if fmt not in _SUPPORTED_FORMATS:
        raise ValueError(
            f"Unsupported screenshot format {format!r}. " f"Supported: {sorted(_SUPPORTED_FORMATS)}"
        )
    if fmt == "jpeg":
        quality = max(1, min(95, quality))
    return fmt, quality


class BaseAutomationHandler(ABC):
    """Abstract base class for OS-specific automation handlers.

    Categories:
    - Mouse Actions: Methods for mouse control
    - Keyboard Actions: Methods for keyboard input
    - Scrolling Actions: Methods for scrolling
    - Screen Actions: Methods for screen interaction
    - Clipboard Actions: Methods for clipboard operations
    """

    # Mouse Actions
    @abstractmethod
    async def mouse_down(
        self, x: Optional[int] = None, y: Optional[int] = None, button: str = "left"
    ) -> Dict[str, Any]:
        """Perform a mouse down at the current or specified position."""
        pass

    @abstractmethod
    async def mouse_up(
        self, x: Optional[int] = None, y: Optional[int] = None, button: str = "left"
    ) -> Dict[str, Any]:
        """Perform a mouse up at the current or specified position."""
        pass

    @abstractmethod
    async def left_click(self, x: Optional[int] = None, y: Optional[int] = None) -> Dict[str, Any]:
        """Perform a left click at the current or specified position."""
        pass

    @abstractmethod
    async def right_click(self, x: Optional[int] = None, y: Optional[int] = None) -> Dict[str, Any]:
        """Perform a right click at the current or specified position."""
        pass

    @abstractmethod
    async def middle_click(
        self, x: Optional[int] = None, y: Optional[int] = None
    ) -> Dict[str, Any]:
        """Perform a middle click at the current or specified position."""
        pass

    @abstractmethod
    async def double_click(
        self, x: Optional[int] = None, y: Optional[int] = None
    ) -> Dict[str, Any]:
        """Perform a double click at the current or specified position."""
        pass

    @abstractmethod
    async def move_cursor(self, x: int, y: int) -> Dict[str, Any]:
        """Move the cursor to the specified position."""
        pass

    @abstractmethod
    async def drag_to(
        self, x: int, y: int, button: str = "left", duration: float = 0.5
    ) -> Dict[str, Any]:
        """Drag the cursor from current position to specified coordinates.

        Args:
            x: The x coordinate to drag to
            y: The y coordinate to drag to
            button: The mouse button to use ('left', 'middle', 'right')
            duration: How long the drag should take in seconds
        """
        pass

    @abstractmethod
    async def drag(
        self, path: List[Tuple[int, int]], button: str = "left", duration: float = 0.5
    ) -> Dict[str, Any]:
        """Drag the cursor from current position to specified coordinates.

        Args:
            path: A list of tuples of x and y coordinates to drag to
            button: The mouse button to use ('left', 'middle', 'right')
            duration: How long the drag should take in seconds
        """
        pass

    # Keyboard Actions
    @abstractmethod
    async def key_down(self, key: str) -> Dict[str, Any]:
        """Press and hold the specified key."""
        pass

    @abstractmethod
    async def key_up(self, key: str) -> Dict[str, Any]:
        """Release the specified key."""
        pass

    @abstractmethod
    async def type_text(self, text: str) -> Dict[str, Any]:
        """Type the specified text."""
        pass

    @abstractmethod
    async def press_key(self, key: str) -> Dict[str, Any]:
        """Press the specified key."""
        pass

    @abstractmethod
    async def hotkey(self, keys: List[str]) -> Dict[str, Any]:
        """Press a combination of keys together."""
        pass

    # Scrolling Actions
    @abstractmethod
    async def scroll(self, x: int, y: int) -> Dict[str, Any]:
        """Scroll the specified amount."""
        pass

    @abstractmethod
    async def scroll_down(self, clicks: int = 1) -> Dict[str, Any]:
        """Scroll down by the specified number of clicks."""
        pass

    @abstractmethod
    async def scroll_up(self, clicks: int = 1) -> Dict[str, Any]:
        """Scroll up by the specified number of clicks."""
        pass

    # Screen Actions
    @abstractmethod
    async def screenshot(self, format: str = "png", quality: int = 95) -> Dict[str, Any]:
        """Take a screenshot and return base64 encoded image data.

        Args:
            format: Image format - "png" (lossless, default) or "jpeg" (lossy, smaller).
            quality: JPEG quality 1-95, ignored for PNG.
        """
        pass

    @abstractmethod
    async def get_screen_size(self) -> Dict[str, Any]:
        """Get the screen size of the VM."""
        pass

    @abstractmethod
    async def get_cursor_position(self) -> Dict[str, Any]:
        """Get the current cursor position."""
        pass

    # Clipboard Actions
    async def copy_to_clipboard(self) -> Dict[str, Any]:
        """Get the current clipboard content using pyperclip."""
        try:
            import pyperclip

            content = pyperclip.paste()
            return {"success": True, "content": content}
        except Exception as e:
            return {"success": False, "error": str(e)}

    async def set_clipboard(self, text: str) -> Dict[str, Any]:
        """Set the clipboard content using pyperclip."""
        try:
            import pyperclip

            pyperclip.copy(text)
            return {"success": True}
        except Exception as e:
            return {"success": False, "error": str(e)}

    # Command Execution
    async def run_command(self, command: str, timeout: Optional[float] = None) -> Dict[str, Any]:
        """Run a shell command locally and return its output.

        When IS_CUA_ANDROID env var is set, routes the command through
        ``adb shell`` so execution runs inside the Android emulator.

        Args:
            command: The shell command to run.
            timeout: Optional timeout in seconds.  When ``None`` (default),
                the command runs until completion with no upper bound.  SDK
                callers set this via ``sb.shell.run(cmd, timeout=...)``
                (see ``cua_sandbox.interfaces.shell.Shell.run``).  On
                expiry the subprocess is killed and the result is
                ``{"success": False, "stderr": "Command timed out after <t>s",
                "return_code": -1}``.
        """
        import os

        try:
            if os.environ.get("IS_CUA_ANDROID") == "true":
                process = await asyncio.create_subprocess_exec(
                    "adb",
                    "shell",
                    command,
                    stdout=asyncio.subprocess.PIPE,
                    stderr=asyncio.subprocess.PIPE,
                )
            else:
                process = await asyncio.create_subprocess_shell(
                    command, stdout=asyncio.subprocess.PIPE, stderr=asyncio.subprocess.PIPE
                )
            try:
                if timeout is None:
                    stdout, stderr = await process.communicate()
                else:
                    stdout, stderr = await asyncio.wait_for(process.communicate(), timeout=timeout)
            except asyncio.TimeoutError:
                process.kill()
                return {
                    "success": False,
                    "stdout": "",
                    "stderr": f"Command timed out after {timeout}s",
                    "return_code": -1,
                }
            return {
                "success": True,
                "stdout": stdout.decode() if stdout else "",
                "stderr": stderr.decode() if stderr else "",
                "return_code": process.returncode,
            }
        except Exception as e:
            return {"success": False, "error": str(e)}