# mypy: ignore-errors
import logging
import queue
import sys
import threading
import tkinter as tk
import traceback
from collections.abc import Callable
from enum import Enum, auto
from pathlib import Path
from typing import Literal

from serena import constants
from serena.util.logging import MemoryLogHandler

log = logging.getLogger(__name__)


class LogLevel(Enum):
    DEBUG = auto()
    INFO = auto()
    WARNING = auto()
    ERROR = auto()
    DEFAULT = auto()


class GuiLogViewer:
    """
    A class that creates a Tkinter GUI for displaying log messages in a separate thread.
    The log viewer supports coloring based on log levels (DEBUG, INFO, WARNING, ERROR).
    It can also highlight tool names in boldface when they appear in log messages.
    """

    def __init__(
        self,
        mode: Literal["dashboard", "error"],
        title="Log Viewer",
        memory_log_handler: MemoryLogHandler | None = None,
        width=800,
        height=600,
        shutdown_handler: Callable[[], None] | None = None,
    ):
        """
        :param mode: the mode; if "dashboard", run a dashboard with logs and some control options; if "error", run
            a simple error log viewer (for fatal exceptions)
        :param title: the window title
        :param memory_log_handler: an optional log handler from which to obtain log messages; If not provided,
            must pass the instance to a `GuiLogViewerHandler` to add log messages.
        :param width: the initial window width
        :param height: the initial window height
        """
        self.mode = mode
        self.title = title
        self.width = width
        self.height = height
        self.message_queue = queue.Queue()
        self.running = False
        self.log_thread = None
        self.menubar: tk.Menu | None = None
        self.tool_names = []  # List to store tool names for highlighting
        self.shutdown_handler = shutdown_handler

        # Define colors for different log levels
        self.log_colors = {
            LogLevel.DEBUG: "#808080",  # Gray
            LogLevel.INFO: "#000000",  # Black
            LogLevel.WARNING: "#FF8C00",  # Dark Orange
            LogLevel.ERROR: "#FF0000",  # Red
            LogLevel.DEFAULT: "#000000",  # Black
        }

        if memory_log_handler is not None:
            for msg in memory_log_handler.get_log_messages().messages:
                self.message_queue.put(msg)
            memory_log_handler.add_emit_callback(lambda msg: self.message_queue.put(msg))

    def start(self):
        """Start the log viewer in a separate thread."""
        if not self.running:
            self.log_thread = threading.Thread(target=self.run_gui)
            self.log_thread.daemon = True
            self.log_thread.start()
            return True
        return False

    def stop(self):
        """Stop the log viewer."""
        if self.running:
            # Add a sentinel value to the queue to signal the GUI to exit
            self.message_queue.put(None)
            return True
        return False

    def set_tool_names(self, tool_names):
        """
        Set or update the list of tool names to be highlighted in log messages.

        Args:
            tool_names (list): A list of tool name strings to highlight

        """
        self.tool_names = tool_names

    def set_dashboard_url(self, url: str) -> None:
        def copy_url():
            self.root.clipboard_clear()
            self.root.clipboard_append(url)
            log.info(f"Copied dashboard URL to clipboard: {url}")

        if self.menubar is not None:
            dashboard_menu = tk.Menu(self.menubar, tearoff=0)
            dashboard_menu.add_command(label="Copy URL", command=copy_url)  # type: ignore
            self.menubar.add_cascade(label="Dashboard", menu=dashboard_menu)

    def add_log(self, message):
        """
        Add a log message to the viewer.

        Args:
            message (str): The log message to display

        """
        self.message_queue.put(message)

    def _determine_log_level(self, message):
        """
        Determine the log level from the message.

        Args:
            message (str): The log message

        Returns:
            LogLevel: The determined log level

        """
        message_upper = message.upper()
        if message_upper.startswith("DEBUG"):
            return LogLevel.DEBUG
        elif message_upper.startswith("INFO"):
            return LogLevel.INFO
        elif message_upper.startswith("WARNING"):
            return LogLevel.WARNING
        elif message_upper.startswith("ERROR"):
            return LogLevel.ERROR
        else:
            return LogLevel.DEFAULT

    def _process_queue(self):
        """Process messages from the queue and update the text widget."""
        try:
            while not self.message_queue.empty():
                message = self.message_queue.get_nowait()

                # Check for sentinel value to exit
                if message is None:
                    self.root.quit()
                    return

                # Check if scrollbar is at the bottom before adding new text
                # Get current scroll position
                current_position = self.text_widget.yview()
                # If near the bottom (allowing for small floating point differences)
                was_at_bottom = current_position[1] > 0.99

                log_level = self._determine_log_level(message)

                # Insert the message at the end of the text with appropriate log level tag
                self.text_widget.configure(state=tk.NORMAL)

                # Find tool names in the message and highlight them
                if self.tool_names:
                    # Capture start position (before insertion)
                    start_index = self.text_widget.index("end-1c")

                    # Insert the message
                    self.text_widget.insert(tk.END, message + "\n", log_level.name)

                    # Convert start index to line/char format
                    line, char = map(int, start_index.split("."))

                    # Search for tool names in the message string directly
                    for tool_name in self.tool_names:
                        start_offset = 0
                        while True:
                            found_at = message.find(tool_name, start_offset)
                            if found_at == -1:
                                break

                            # Calculate line/column from offset
                            offset_line = line
                            offset_char = char
                            for c in message[:found_at]:
                                if c == "\n":
                                    offset_line += 1
                                    offset_char = 0
                                else:
                                    offset_char += 1

                            # Construct index positions
                            start_pos = f"{offset_line}.{offset_char}"
                            end_pos = f"{offset_line}.{offset_char + len(tool_name)}"

                            # Add tag to highlight the tool name
                            self.text_widget.tag_add("TOOL_NAME", start_pos, end_pos)

                            start_offset = found_at + len(tool_name)

                else:
                    # No tool names to highlight, just insert the message
                    self.text_widget.insert(tk.END, message + "\n", log_level.name)

                self.text_widget.configure(state=tk.DISABLED)

                # Auto-scroll to the bottom only if it was already at the bottom
                if was_at_bottom:
                    self.text_widget.see(tk.END)

            # Schedule to check the queue again
            if self.running:
                self.root.after(100, self._process_queue)

        except Exception as e:
            print(f"Error processing message queue: {e}", file=sys.stderr)
            if self.running:
                self.root.after(100, self._process_queue)

    def run_gui(self):
        """Run the GUI"""
        self.running = True
        try:
            # Set app id (avoid app being lumped together with other Python-based apps in Windows taskbar)
            if sys.platform == "win32":
                import ctypes

                ctypes.windll.shell32.SetCurrentProcessExplicitAppUserModelID("oraios.serena")

            self.root = tk.Tk()
            self.root.title(self.title)
            self.root.geometry(f"{self.width}x{self.height}")

            # Make the window resizable
            self.root.columnconfigure(0, weight=1)
            # We now have two rows - one for logo and one for text
            self.root.rowconfigure(0, weight=0)  # Logo row
            self.root.rowconfigure(1, weight=1)  # Text content row

            dashboard_path = Path(constants.SERENA_DASHBOARD_DIR)

            # Load and display the logo image
            try:
                # construct path relative to path of this file
                image_path = dashboard_path / "serena-logs.png"
                self.logo_image = tk.PhotoImage(file=image_path)

                # Create a label to display the logo
                self.logo_label = tk.Label(self.root, image=self.logo_image)
                self.logo_label.grid(row=0, column=0, sticky="ew")
            except Exception as e:
                print(f"Error loading logo image: {e}", file=sys.stderr)

            # Create frame to hold text widget and scrollbars
            frame = tk.Frame(self.root)
            frame.grid(row=1, column=0, sticky="nsew")
            frame.columnconfigure(0, weight=1)
            frame.rowconfigure(0, weight=1)

            # Create horizontal scrollbar
            h_scrollbar = tk.Scrollbar(frame, orient=tk.HORIZONTAL)
            h_scrollbar.grid(row=1, column=0, sticky="ew")

            # Create vertical scrollbar
            v_scrollbar = tk.Scrollbar(frame, orient=tk.VERTICAL)
            v_scrollbar.grid(row=0, column=1, sticky="ns")

            # Create text widget with horizontal scrolling
            self.text_widget = tk.Text(
                frame, wrap=tk.NONE, width=self.width, height=self.height, xscrollcommand=h_scrollbar.set, yscrollcommand=v_scrollbar.set
            )
            self.text_widget.grid(row=0, column=0, sticky="nsew")
            self.text_widget.configure(state=tk.DISABLED)  # Make it read-only

            # Configure scrollbars
            h_scrollbar.config(command=self.text_widget.xview)
            v_scrollbar.config(command=self.text_widget.yview)

            # Configure tags for different log levels with appropriate colors
            for level, color in self.log_colors.items():
                self.text_widget.tag_configure(level.name, foreground=color)

            # Configure tag for tool names
            self.text_widget.tag_configure("TOOL_NAME", background="#ffff00")

            # Set up the queue processing
            self.root.after(100, self._process_queue)

            # Handle window close event depending on mode
            if self.mode == "dashboard":
                self.root.protocol("WM_DELETE_WINDOW", lambda: self.root.iconify())
            else:
                self.root.protocol("WM_DELETE_WINDOW", self.stop)

            # Create menu bar
            if self.mode == "dashboard":
                self.menubar = tk.Menu(self.root)
                server_menu = tk.Menu(self.menubar, tearoff=0)
                server_menu.add_command(label="Shutdown", command=self._shutdown_server)  # type: ignore
                self.menubar.add_cascade(label="Server", menu=server_menu)
                self.root.config(menu=self.menubar)

            # Configure icons
            icon_16 = tk.PhotoImage(file=dashboard_path / "serena-icon-16.png")
            icon_32 = tk.PhotoImage(file=dashboard_path / "serena-icon-32.png")
            icon_48 = tk.PhotoImage(file=dashboard_path / "serena-icon-48.png")
            self.root.iconphoto(False, icon_48, icon_32, icon_16)

            # Start the Tkinter event loop
            self.root.mainloop()

        except Exception as e:
            print(f"Error in GUI thread: {e}", file=sys.stderr)
        finally:
            self.running = False

    def _shutdown_server(self) -> None:
        if self.shutdown_handler is not None:
            self.shutdown_handler()


class GuiLogViewerHandler(logging.Handler):
    """
    A logging handler that sends log records to a ThreadedLogViewer instance.
    This handler can be integrated with Python's standard logging module
    to direct log entries to a GUI log viewer.
    """

    def __init__(
        self,
        log_viewer: GuiLogViewer,
        level=logging.NOTSET,
        format_string: str | None = "%(levelname)-5s %(asctime)-15s %(name)s:%(funcName)s:%(lineno)d - %(message)s",
    ):
        """
        Initialize the handler with a ThreadedLogViewer instance.

        Args:
            log_viewer: A ThreadedLogViewer instance that will display the logs
            level: The logging level (default: NOTSET which captures all logs)
            format_string: the format string

        """
        super().__init__(level)
        self.log_viewer = log_viewer
        self.formatter = logging.Formatter(format_string)

        # Start the log viewer if it's not already running
        if not self.log_viewer.running:
            self.log_viewer.start()

    @classmethod
    def is_instance_registered(cls) -> bool:
        for h in logging.Logger.root.handlers:
            if isinstance(h, cls):
                return True
        return False

    def emit(self, record):
        """
        Emit a log record to the ThreadedLogViewer.

        Args:
            record: The log record to emit

        """
        try:
            # Format the record according to the formatter
            msg = self.format(record)

            # Convert the level name to a standard format for the viewer
            level_prefix = record.levelname

            # Add the appropriate prefix if it's not already there
            if not msg.startswith(level_prefix):
                msg = f"{level_prefix}: {msg}"

            self.log_viewer.add_log(msg)

        except Exception:
            self.handleError(record)

    def close(self):
        """
        Close the handler and optionally stop the log viewer.
        """
        # We don't automatically stop the log viewer here as it might
        # be used by other handlers or directly by the application
        super().close()

    def stop_viewer(self):
        """
        Explicitly stop the associated log viewer.
        """
        if self.log_viewer.running:
            self.log_viewer.stop()


def show_fatal_exception(e: Exception):
    """
    Makes sure the given exception is shown in the GUI log viewer,
    either an existing instance or a new one.

    :param e: the exception to display
    """
    # show in new window in main thread (user must close it)
    log_viewer = GuiLogViewer("error")
    exc_info = "".join(traceback.format_exception(type(e), e, e.__traceback__))
    log_viewer.add_log(f"ERROR Fatal exception: {e}\n{exc_info}")
    log_viewer.run_gui()
