""" Classes Method and Functions for lx Apps """

import logging
import signal
import base64
from subprocess import CompletedProcess, run
import re
import sys
import shutil
import tkinter as tk
from typing import Optional, Dict, Any, NoReturn
from pathlib import Path
from tkinter import ttk, Toplevel


class CryptoUtil:
    """
    This class is for the creation of the folders and files
    required by Wire-Py, as well as for decryption
    the tunnel from the user's home directory
    """

    @staticmethod
    def decrypt(user) -> None:
        """
        Starts SSL dencrypt
        """
        process: CompletedProcess[str] = run(
            ["pkexec", "/usr/local/bin/ssl_decrypt.py", "--user", user],
            capture_output=True,
            text=True,
            check=False,
        )

        # Output from Openssl Error
        if process.stderr:
            logging.error(process.stderr, exc_info=True)

        if process.returncode == 0:
            logging.info("Files successfully decrypted...", exc_info=True)
        else:

            logging.error(
                f"Error process decrypt: Code {process.returncode}", exc_info=True
            )

    @staticmethod
    def encrypt(user) -> None:
        """
        Starts SSL encryption
        """
        process: CompletedProcess[str] = run(
            ["pkexec", "/usr/local/bin/ssl_encrypt.py", "--user", user],
            capture_output=True,
            text=True,
            check=False,
        )

        # Output from Openssl Error
        if process.stderr:
            logging.error(process.stderr, exc_info=True)

        if process.returncode == 0:
            logging.info("Files successfully encrypted...", exc_info=True)
        else:
            logging.error(
                f"Error process encrypt: Code {process.returncode}", exc_info=True
            )

    @staticmethod
    def find_key(key: str = "") -> bool:
        """
        Checks if the private key already exists in the system using an external script.
        Returns True only if the full key is found exactly (no partial match).
        """
        process: CompletedProcess[str] = run(
            ["pkexec", "/usr/local/bin/match_found.py", key],
            capture_output=True,
            text=True,
            check=False,
        )
        if "True" in process.stdout:
            return True
        elif "False" in process.stdout:
            return False
        logging.error(
            f"Unexpected output from the external script:\nSTDOUT: {process.stdout}\nSTDERR: {process.stderr}",
            exc_info=True,
        )
        return False

    @staticmethod
    def is_valid_base64(key: str) -> bool:
        """
        Validates if the input is a valid Base64 string (WireGuard private key format).
        Returns True only for non-empty strings that match the expected length.
        """
        # Check for empty string
        if not key or key.strip() == "":
            return False

        # Regex pattern to validate Base64: [A-Za-z0-9+/]+={0,2}
        base64_pattern = r"^[A-Za-z0-9+/]+={0,2}$"
        if not re.match(base64_pattern, key):
            return False

        try:
            # Decode and check length (WireGuard private keys are 32 bytes long)
            decoded = base64.b64decode(key)
            if len(decoded) != 32:  # 32 bytes = 256 bits
                return False
        except Exception as e:
            logging.error(f"Error on decode Base64: {e}", exc_info=True)
            return False

        return True


class LxTools:
    """
    Class LinuxTools methods that can also be used for other apps
    """

    def __init__(self, *args: Any, **kwargs: Any) -> None:
        super().__init__(*args, **kwargs)

    @staticmethod
    def center_window_cross_platform(window, width, height):
        """
        Centers a window on the primary monitor in a way that works on both X11 and Wayland

        Args:
            window: The tkinter window to center
            width: Window width
            height: Window height
        """
        # Calculate the position before showing the window

        # First attempt: Try to use GDK if available (works on both X11 and Wayland)
        try:
            import gi

            gi.require_version("Gdk", "3.0")
            from gi.repository import Gdk

            display = Gdk.Display.get_default()
            monitor = display.get_primary_monitor() or display.get_monitor(0)
            geometry = monitor.get_geometry()
            scale_factor = monitor.get_scale_factor()

            # Calculate center position on the primary monitor
            x = geometry.x + (geometry.width - width // scale_factor) // 2
            y = geometry.y + (geometry.height - height // scale_factor) // 2

            # Set window geometry
            window.geometry(f"{width}x{height}+{x}+{y}")
            return
        except (ImportError, AttributeError):
            pass

        # Second attempt: Try xrandr for X11
        try:
            import subprocess

            output = subprocess.check_output(
                ["xrandr", "--query"], universal_newlines=True
            )

            # Parse the output to find the primary monitor
            primary_info = None
            for line in output.splitlines():
                if "primary" in line:
                    parts = line.split()
                    for part in parts:
                        if "x" in part and "+" in part:
                            primary_info = part
                            break
                    break

            if primary_info:
                # Parse the geometry: WIDTH x HEIGHT+X+Y
                geometry = primary_info.split("+")
                dimensions = geometry[0].split("x")
                primary_width = int(dimensions[0])
                primary_height = int(dimensions[1])
                primary_x = int(geometry[1])
                primary_y = int(geometry[2])

                # Calculate center position on the primary monitor
                x = primary_x + (primary_width - width) // 2
                y = primary_y + (primary_height - height) // 2

                # Set window geometry
                window.geometry(f"{width}x{height}+{x}+{y}")
                return
        except (ImportError, IndexError, ValueError):
            pass

        # Final fallback: Use standard Tkinter method
        screen_width = window.winfo_screenwidth()
        screen_height = window.winfo_screenheight()

        # Try to make an educated guess for multi-monitor setups
        # If screen width is much larger than height, assume multiple monitors side by side
        if (
            screen_width > screen_height * 1.8
        ):  # Heuristic for detecting multiple monitors
            # Assume the primary monitor is on the left half
            screen_width = screen_width // 2

        x = (screen_width - width) // 2
        y = (screen_height - height) // 2
        window.geometry(f"{width}x{height}+{x}+{y}")

    @staticmethod
    def clean_files(tmp_dir: Path = None, file: Path = None) -> None:
        """
        Deletes temporary files and directories for cleanup when exiting the application.

        This method safely removes an optional directory defined by `AppConfig.TEMP_DIR`
        and a single file to free up resources at the end of the program's execution.
        All operations are performed securely, and errors such as `FileNotFoundError`
        are ignored if the target files or directories do not exist.
        :param tmp_dir: (Path, optional): Path to the temporary directory that should be deleted.
                If `None`, the value of `AppConfig.TEMP_DIR` is used.
        :param file: (Path, optional): Path to the file that should be deleted.
                If `None`, no additional file will be deleted.

        Returns:
            None: The method does not return any value.
        """

        if tmp_dir is not None:
            shutil.rmtree(tmp_dir, ignore_errors=True)
        try:
            if file is not None:
                Path.unlink(file)

        except FileNotFoundError:
            pass

    @staticmethod
    def sigi(file_path: Optional[Path] = None, file: Optional[Path] = None) -> None:
        """
        Function for cleanup after a program interruption

        :param file: Optional - File to be deleted
        :param file_path: Optional - Directory to be deleted
        """

        def signal_handler(signum: int, frame: Any) -> NoReturn:
            """
            Determines clear text names for signal numbers and handles signals

            Args:
                signum: The signal number
                frame: The current stack frame

            Returns:
                NoReturn since the function either exits the program or continues execution
            """

            signals_to_names_dict: Dict[int, str] = dict(
                (getattr(signal, n), n)
                for n in dir(signal)
                if n.startswith("SIG") and "_" not in n
            )

            signal_name: str = signals_to_names_dict.get(
                signum, f"Unnamed signal: {signum}"
            )

            # End program for certain signals, report to others only reception
            if signum in (signal.SIGINT, signal.SIGTERM):
                exit_code: int = 1
                logging.error(
                    f"\nSignal {signal_name} {signum} received. => Aborting with exit code {exit_code}.",
                    exc_info=True,
                )
                LxTools.clean_files(file_path, file)
                logging.info("Breakdown by user...")
                sys.exit(exit_code)
            else:
                logging.info(f"Signal {signum} received and ignored.")
                LxTools.clean_files(file_path, file)
                logging.error("Process unexpectedly ended...")

        # Register signal handlers for various signals
        signal.signal(signal.SIGINT, signal_handler)
        signal.signal(signal.SIGTERM, signal_handler)
        signal.signal(signal.SIGHUP, signal_handler)


# ConfigManager with caching
class ConfigManager:
    """
    Universal class for managing configuration files with caching support.

    This class provides a general solution to load, save, and manage configuration
    files across different projects. It uses a caching system to optimize access efficiency.
    The `init()` method initializes the configuration file path, while `load()` and `save()`
    synchronize data between the file and internal memory structures.

    Key Features:
    - Caching to minimize I/O operations.
    - Default values for missing or corrupted configuration files.
    - Reusability across different projects and use cases.

    The class is designed for central application configuration management, working closely
    with `ThemeManager` to dynamically manage themes or other settings.
    """

    _config = None
    _config_file = None

    @classmethod
    def init(cls, config_file):
        """Initial the Configmanager with the given config file"""
        cls._config_file = config_file
        cls._config = None  # Reset the cache

    @classmethod
    def load(cls):
        """Load the config file and return the config as dict"""
        if not cls._config:
            try:
                lines = Path(cls._config_file).read_text(encoding="utf-8").splitlines()
                cls._config = {
                    "updates": lines[1].strip(),
                    "theme": lines[3].strip(),
                    "tooltips": lines[5].strip()
                    == "True",  # is converted here to boolean!!!
                    "autostart": lines[7].strip() if len(lines) > 7 else "off",
                    "logfile": lines[9].strip(),
                }
            except (IndexError, FileNotFoundError):
                # DeDefault values in case of error
                cls._config = {
                    "updates": "on",
                    "theme": "light",
                    "tooltips": "True",  # Default Value as string!
                    "autostart": "off",
                    "logfile": LOG_FILE_PATH,
                }
        return cls._config

    @classmethod
    def save(cls):
        """Save the config to the config file"""
        if cls._config:
            lines = [
                "# Configuration\n",
                f"{cls._config['updates']}\n",
                "# Theme\n",
                f"{cls._config['theme']}\n",
                "# Tooltips\n",
                f"{str(cls._config['tooltips'])}\n",
                "# Autostart\n",
                f"{cls._config['autostart']}\n",
                "# Logfile\n",
                f"{cls._config['logfile']}\n",
            ]
            Path(cls._config_file).write_text("".join(lines), encoding="utf-8")

    @classmethod
    def set(cls, key, value):
        """Sets a configuration value and saves the change"""
        cls.load()
        cls._config[key] = value
        cls.save()

    @classmethod
    def get(cls, key, default=None):
        """Returns a configuration value"""
        config = cls.load()
        return config.get(key, default)


class ThemeManager:
    """
    Class for central theme management and UI customization.

    This static class allows dynamic adjustment of the application's appearance.
    The method `change_theme()` updates the current theme and saves
    the selection in the configuration file via `ConfigManager`.
    It ensures a consistent visual design across the entire project.

    Key Features:
    - Central control over themes.
    - Automatic saving of theme settings to the configuration file.
    - Tight integration with `ConfigManager` for persistent storage of preferences.

    The class is designed to apply themes consistently throughout the application,
    ensuring that changes are traceable and uniform across all parts of the project.
    """

    @staticmethod
    def change_theme(root, theme_in_use, theme_name=None):
        """Change application theme centrally"""
        root.tk.call("set_theme", theme_in_use)
        if theme_in_use == theme_name:
            ConfigManager.set("theme", theme_in_use)


class Tooltip:
    """Class for Tooltip
    from common_tools.py import Tooltip
    example: Tooltip(label, "Show tooltip on label")
    example: Tooltip(button, "Show tooltip on button")
    example: Tooltip(widget, "Text", state_var=tk.BooleanVar())
    example: Tooltip(widget, "Text", state_var=tk.BooleanVar(), x_offset=20, y_offset=10)

    info: label and button are parent widgets.
    NOTE: When using with state_var, pass the tk.BooleanVar object directly,
    NOT its value. For example: use state_var=my_bool_var, NOT state_var=my_bool_var.get()
    """

    def __init__(
        self,
        widget: Any,
        text: str,
        state_var: Optional[tk.BooleanVar] = None,
        x_offset: int = 65,
        y_offset: int = 40,
    ) -> None:
        """Tooltip Class"""
        self.widget: Any = widget
        self.text: str = text
        self.tooltip_window: Optional[Toplevel] = None
        self.state_var = state_var
        self.x_offset = x_offset
        self.y_offset = y_offset

        # Initial binding based on the current state
        self.update_bindings()

        # Add trace to the state_var if provided
        if self.state_var is not None:
            self.state_var.trace_add("write", self.update_bindings)

    def update_bindings(self, *args) -> None:
        """Updates the bindings based on the current state"""
        # Remove existing bindings first
        self.widget.unbind("<Enter>")
        self.widget.unbind("<Leave>")

        # Add new bindings if tooltips are enabled
        if self.state_var is None or self.state_var.get():
            self.widget.bind("<Enter>", self.show_tooltip)
            self.widget.bind("<Leave>", self.hide_tooltip)

    def show_tooltip(self, event: Optional[Any] = None) -> None:
        """Shows the tooltip"""
        if self.tooltip_window or not self.text:
            return

        x: int
        y: int
        cx: int
        cy: int

        x, y, cx, cy = self.widget.bbox("insert")
        x += self.widget.winfo_rootx() + self.x_offset
        y += self.widget.winfo_rooty() + self.y_offset

        self.tooltip_window = tw = tk.Toplevel(self.widget)
        tw.wm_overrideredirect(True)
        tw.wm_geometry(f"+{x}+{y}")

        label: tk.Label = tk.Label(
            tw,
            text=self.text,
            background="lightgreen",
            foreground="black",
            relief="solid",
            borderwidth=1,
            padx=5,
            pady=5,
        )
        label.grid()

        self.tooltip_window.after(2200, lambda: tw.destroy())

    def hide_tooltip(self, event: Optional[Any] = None) -> None:
        """Hides the tooltip"""
        if self.tooltip_window:
            self.tooltip_window.destroy()
            self.tooltip_window = None


class LogConfig:
    @staticmethod
    def logger(file_path) -> None:

        file_handler = logging.FileHandler(
            filename=f"{file_path}",
            mode="a",
            encoding="utf-8",
        )
        formatter = logging.Formatter("%(asctime)s - %(levelname)s - %(message)s")
        file_handler.setFormatter(formatter)
        file_handler.setLevel(logging.DEBUG)

        logger = logging.getLogger()
        logger.addHandler(file_handler)