#!/usr/bin/python3

import sys
import os
import subprocess
import re
import gettext


BUILD_VERSION='%%VERSION%%'
MX_UPDATER_PATH = "/usr/libexec/mx-updater"

# remove directory of the current script
if '' in sys.path:
    sys.path.remove('')

script_dir = os.path.dirname(os.path.abspath(__file__))
if script_dir in sys.path:
    sys.path.remove(script_dir)

if MX_UPDATER_PATH not in sys.path:
    sys.path.insert(0, MX_UPDATER_PATH)


from updater_translator import Translator

# localization
translator = Translator(textdomain='mx-updater')
_ = translator.translate

# use _t() to reuse existing tranlations
_t = _


"""
import gettext
LOCALE_DOMAIN = 'mx-updater'
LOCALE_DIR = '/usr/share/locale'
# bind the domain
gettext.bindtextdomain(LOCALE_DOMAIN, LOCALE_DIR)
gettext.textdomain(LOCALE_DOMAIN)
_ = gettext.gettext

"""

from PyQt6.QtWidgets import (
    QApplication, QDialog, QVBoxLayout, QPlainTextEdit, QPushButton,
    QHBoxLayout, QLineEdit, QStyle, QMessageBox
)
from PyQt6.QtGui import QFont, QFontDatabase, QIcon, QPixmap, QKeyEvent, QGuiApplication, QPalette, QAction, QColor

from PyQt6.QtCore import QTranslator, QLocale, QLibraryInfo, QSettings

from PyQt6.QtCore import Qt, QPoint, QSize
from PyQt6.QtCore import QSettings



def is_dark_palette(pal: QPalette) -> bool:
    """
    Returns True if the base color is dark.
    """
    base = pal.color(QPalette.ColorRole.Base)
    return base.lightnessF() < 0.5


class FilterWithAction(QLineEdit):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        # TRANSLATORS:
        # This is a placeholder string displayed within "search" field.
        # When a "filter" string was enterd by the user, only lines
        # that contain the "filter" string are displayed. So the field is
        # actualy not a "search" field but rather a "filter-by" fieled.
        placeholder_text = _t("Filter by")
        self.setPlaceholderText(f"{placeholder_text}...")
        self.setClearButtonEnabled(False)

        # QAction with a clear/x icon
        clear_icon = QIcon.fromTheme("edit-clear")
        if clear_icon.isNull():
            # fallback: to own .png/.svg icon
            clear_icon = QIcon(":/icons/clear.png")

        self.clear_action = QAction(clear_icon, "Clear text", self)
        # TRANSLATORS:
        # The tooltip shown at the "clear" button to empty the "filter-by" search field.
        tooltip = _t("Clear")
        self.clear_action.setToolTip(f"  {tooltip}  ")
        self.clear_action.triggered.connect(self.clear)

        # put clear_action to the right of line‐edit
        self.addAction(self.clear_action, QLineEdit.ActionPosition.TrailingPosition)

        # only show whith text entered
        self.clear_action.setVisible(False)
        self.textChanged.connect(lambda txt: self.clear_action.setVisible(bool(txt)))

        # set placeholde text for dark mode to "#888888"
        # for lightmode it stays as default ( something like #555 or #777)
        if is_dark_palette(self.palette()):
            pal = self.palette()
            pal.setColor(QPalette.ColorRole.PlaceholderText, QColor("#888888"))
            self.setPalette(pal)

        # adjust padding
        self.setTextMargins(0, 0, 4, 0)

class LogDialog(QDialog):
    def __init__(self, log_text, default_width=960, default_height=600):
        super().__init__()

        self.default_width  = default_width
        self.default_height = default_height

        self.qsettings_section = "Geometry_Updater_History"
        self.qsettings = QSettings("MX-Linux", "mx-updater")

        # TRANSLATORS: "History" menu item in right-click context
        # Allows users to view logs of package installations and removals
        # using dpkg and apt package management tools
        window_title_history = _("History")

        window_title_updater = _("MX Updater")
        window_title = f"[ {window_title_updater} ] -- {window_title_history}"
        window_icon = "/usr/share/icons/hicolor/scalable/apps/updater-mx.svg"
        self.setWindowIcon(QIcon(window_icon))
        self.setWindowTitle(window_title)

        available_geometry = QGuiApplication.primaryScreen().availableGeometry()
        x = available_geometry.width()
        y = available_geometry.height()
        margin_x = 60  # horizontal margin
        margin_y = 60   # vertical margin

        self.resize(min(1100, x - margin_x), min(600, y - margin_y))
        #print("width height : ", self.width(), self.height())
        self.move((x - self.width()) // 2, (y - self.height()) // 2)
        self.setMinimumSize(600, 400)  # Optional: Set minimum size

        # original log text
        self.original_log_text = log_text

        # layout
        layout = QVBoxLayout(self)


        # QPlainTextEdit for displaying log text
        self.log_text_edit = QPlainTextEdit(self)
        self.log_text_edit.setPlainText(self.original_log_text)
        self.log_text_edit.setReadOnly(True)  # read-only

        # system monospace font
        _mono_font = QFontDatabase.systemFont(QFontDatabase.SystemFont.FixedFont)
        self.log_text_edit.setFont(_mono_font)
        # disable line wrapping
        self.log_text_edit.setLineWrapMode(QPlainTextEdit.LineWrapMode.NoWrap)

        # pixels for one space
        space_width = self.log_text_edit.fontMetrics().horizontalAdvance(' ')
        # for 4‐space tabs:
        self.log_text_edit.setTabStopDistance(space_width * 4)

        # "text edit" to the layout
        layout.addWidget(self.log_text_edit)

        #--------------------------------------------------------------
        # horizontal layout for buttons and search field
        button_layout = QHBoxLayout()

        # search field
        #self.search_field = QLineEdit(self)
        self.search_field = FilterWithAction(self)
        # placeholder text
        #placeholder_text = "Filter..."
        placeholder_text = _t("Filter by")
        #print(f'placeholder_text = _("Filter by") : {placeholder_text}')

        self.search_field.setPlaceholderText(f"{placeholder_text}...")
        # fixed width for search field
        self.search_field.setFixedWidth(200)
        # connect to filter function
        self.search_field.textChanged.connect(self.filter_log_text)

        """
        # clear button
        self.clear_button = QPushButton(self)
        self.clear_button.setIcon(self.style().standardIcon(QStyle.StandardPixmap.SP_DialogResetButton))
        self.clear_button.setFixedWidth(30)  # fixed width for clear button
        self.clear_button.clicked.connect(self.clear_search)  # connect to clear function
        """


        # copy and close button
        copy_text = _t("_Copy")

        self.copy_button = QPushButton(copy_text.replace('_','&'), self)
        self.copy_button.setIcon(self.style().standardIcon(QStyle.StandardPixmap.SP_FileIcon))

        # close button - using OK instead of Close
        OK_TEXT = get_standard_button_text(QMessageBox.StandardButton.Ok)

        self.close_button = QPushButton(OK_TEXT, self)
        self.close_button.setIcon(self.style().standardIcon(QStyle.StandardPixmap.SP_DialogCloseButton))

        # connect buttons to functions
        self.close_button.clicked.connect(self.close_and_exit)
        self.copy_button.clicked.connect(self.copy_to_clipboard)

        # add search field
        button_layout.addWidget(self.search_field)
        # clear button - not used as we havea search/filter field
        #button_layout.addWidget(self.clear_button)  # Add the clear button to the layout
        # stretch space before copy and close buttons
        button_layout.addStretch()
        button_layout.addWidget(self.copy_button)
        button_layout.addWidget(self.close_button)

        # button layout to main layout
        layout.addLayout(button_layout)
        #--------------------------------------------------------------

        self.setLayout(layout)

        self.center()

        self.restore_dialog_geometry()

    def center(self):
        # set initial size
        # screen geometry
        screen_geometry = self.screen().geometry()
        #print("Screen Geometry (from QMainWindow):", screen_geometry)

        # available geometry
        desktop = QGuiApplication.primaryScreen()
        available_geometry = desktop.availableGeometry()
        #print("Available Geometry (from primaryScreen()):", available_geometry)

        # window geometry
        window_geometry = self.geometry()

        # center position
        x = available_geometry.x() + (available_geometry.width() - self.width()) // 2
        y = available_geometry.y() + (available_geometry.height() - self.height()) // 2

        # move to center
        self.move(x, y)


    def filter_log_text(self):
        search_text = self.search_field.text().lower()  # get search text

        # filter log text based on original log text
        if search_text:
            filtered_lines = []
            for line in self.original_log_text.splitlines():  # use original log text for filtering
                if search_text in line.lower():  # case insensitive search
                    filtered_lines.append(line)
            self.log_text_edit.setPlainText("\n".join(filtered_lines))  # update text edit with filtered lines
        else:
            self.log_text_edit.setPlainText(self.original_log_text)  # reset to original text if search field is empty

    def clear_search(self):
        self.search_field.clear()  # Clear the search field
        self.log_text_edit.setPlainText(self.original_log_text)  # Reset to original text

    def copy_to_clipboard(self):
        # copy text to the clipboard
        clipboard = QApplication.clipboard()
        clipboard.setText(self.log_text_edit.toPlainText())

    def close_and_exit(self):
        self.save_dialog_geometry()
        self.accept()  # Close the dialog


    def resize_and_center(self):
        """
        Resize and center the window with scaling.

        :param default_width: Desired window width
        :param default_height: Desired window height
        """

        default_width  = self.default_width
        default_height = self.default_height

        #print(f"Original size: {default_width}x{default_height}")

        # Get the primary screen
        screen = QGuiApplication.primaryScreen()

        # Get available screen geometry (accounting for panels)
        available_geometry = screen.availableGeometry()
        #print(f"Screen available: {available_geometry.width()}x{available_geometry.height()}")

        # Calculate maximum allowed size while preserving aspect ratio
        max_width = int(available_geometry.width() * 0.9)  # 90% of available width
        max_height = int(available_geometry.height() * 0.9)  # 90% of available height
        #print(f"max_width x max_height: {max_width} x {max_height}")

        # calculate scaling factors
        width_scale = max_width / default_width
        height_scale = max_height / default_height

        # use the smaller scale to maintain aspect ratio, but not scale up
        scale = min(1.0, min(width_scale, height_scale))

        # calculate final dimensions
        final_width = int(default_width * scale)
        final_height = int(default_height * scale)

        # Resize the window to exact calculated dimensions
        self.resize(final_width, final_height)

        # calculate center position
        center_point = available_geometry.center()
        frame_geometry = self.frameGeometry()
        frame_geometry.moveCenter(center_point)

        # ensure window is within available screen space
        adjusted_pos = frame_geometry.topLeft()
        adjusted_pos.setX(max(available_geometry.left(),
                               min(adjusted_pos.x(),
                                   available_geometry.right() - frame_geometry.width())))
        adjusted_pos.setY(max(available_geometry.top(),
                               min(adjusted_pos.y(),
                                   available_geometry.bottom() - frame_geometry.height())))

        # move window
        self.move(adjusted_pos)

        print(f"Final size: {final_width}x{final_height}")

    def keyPressEvent_NotUsed(self, event):
        """
        Override key press event to close window when Esc is pressed.

        :param event: Key press event
        """
        if event.key() == Qt.Key.Key_Escape:
            self.close()
        super().keyPressEvent(event)

    def done(self, result):
        # Save geometry when dialog is closed
        self.save_dialog_geometry()
        super().done(result)

    def save_dialog_geometry(self):
        """
        Save dialog position and size to QSettings
        """
        section = self.qsettings_section
        self.qsettings.setValue(f'{section}/position', self.pos())
        self.qsettings.setValue(f'{section}/size', self.size())

    def restore_dialog_geometry(self):
        """
        Restore dialog position and size, with fallback to 'resize_and_center' method
        """
        # get primary screen's available geometry
        screen = QGuiApplication.primaryScreen()
        available_geometry = screen.availableGeometry()

        # check if valid geometry exists in settings
        section = self.qsettings_section
        saved_pos = self.qsettings.value(f'{section}/position', None)
        saved_size = self.qsettings.value(f'{section}/size', None)

        # validate saved geometry
        if (saved_pos is not None and saved_size is not None and
            isinstance(saved_pos, QPoint) and isinstance(saved_size, QSize)):

            # Adjust size to fit within available geometry
            adjusted_size = self.adjust_size_to_screen(saved_size, available_geometry)

            # Adjust position to ensure dialog is within screen bounds
            adjusted_pos = self.adjust_position_to_screen(saved_pos, adjusted_size, available_geometry)

            # Set the dialog geometry
            self.resize(adjusted_size)
            self.move(adjusted_pos)

        else:
            # No valid saved geometry - use resize_and_center method
            self.resize_and_center()

    def adjust_size_to_screen(self, size, available_geometry):
        """
        Ensure dialog size does not exceed available screen geometry
        """
        max_width = min(size.width(), available_geometry.width())
        max_height = min(size.height(), available_geometry.height())

        return QSize(
            max(max_width, self.minimumWidth()),
            max(max_height, self.minimumHeight())
        )

    def adjust_position_to_screen(self, pos, size, available_geometry):
        """
        Ensure dialog position is within available screen geometry
        """
        # Adjust x-coordinate
        x = max(
            available_geometry.left(),
            min(pos.x(), available_geometry.right() - size.width())
        )

        # Adjust y-coordinate
        y = max(
            available_geometry.top(),
            min(pos.y(), available_geometry.bottom() - size.height())
        )

        return QPoint(x, y)


def get_apt_history():
    try:
        # Run apt-history command and capture the output
        command = ["/usr/bin/apt-history"]
        result = subprocess.run(
            command,
            shell=False,  # Use shell=True to execute the command as a single string
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
            text=True
        )

        # Process the output using Python
        if result.stdout.strip():
            # Replace the sed command with Python code
            processed_lines = []
            for line in result.stdout.splitlines():
                # Use regex to replace ":<lowercase letter>" with " <lowercase letter>"
                processed_line = re.sub(r':([a-z])', r' \1', line)
                processed_lines.append(processed_line)

            # Create a list of lists for column data
            column_data = [line.split() for line in processed_lines]

            # Calculate maximum width for each column
            max_widths = []
            for row in column_data:
                for i, item in enumerate(row):
                    if i >= len(max_widths):
                        max_widths.append(len(item))
                    else:
                        max_widths[i] = max(max_widths[i], len(item))

            # format output into columns
            formatted_lines = []
            for row in column_data:
                formatted_line = ""
                for i, item in enumerate(row):
                    formatted_line += f"{item:<{max_widths[i]}}  "  # Align left with padding
                formatted_lines.append(formatted_line.rstrip())

            # Join formatted lines into a single string with newlines
            return "\n".join(formatted_lines)
        else:
            return _("No apt-history data found!")
    except Exception as e:
        error=_("Error retrieving apt-history:")
        return f"{error} {str(e)}"

def get_standard_button_text(button):
    # temporary message box to access the button text
    msg_box = QMessageBox()
    msg_box.setStandardButtons(button)
    text = msg_box.button(button).text()
    return text


if __name__ == '__main__':
    app = QApplication(sys.argv)
    app.setApplicationName("updater-mx")

    # QTranslator instance
    qtranslator = QTranslator()
    locale = QLocale.system().name()  # Get the system locale

    # get path to  translations directory
    translations_path = QLibraryInfo.path(QLibraryInfo.LibraryPath.TranslationsPath)
    translation_file_path = f"{translations_path}/qt_{locale}.qm"

    # load translation file
    if qtranslator.load(translation_file_path):
        #print(f"Translation file for locale {locale} found: {translation_file_path}")
        app.installTranslator(qtranslator)
    else:
        #print(f"Translation file not found: {translation_file_path}")
        pass


    CLOSE_TEXT = "&Close"
    CLOSE_TEXT = get_standard_button_text(QMessageBox.StandardButton.Close)

    # get apt-history log text
    log_text = get_apt_history()

    default_width  = 900
    default_height = 600

    dialog = LogDialog(log_text,
            default_width=default_width,
            default_height=default_height
            )

    dialog.exec()  # This will block until the dialog is closed

    sys.exit()  # Exit the application after the dialog is closed
