import logging
import signal

from PyQt6 import QtCore
from PyQt6.QtWidgets import *
from PyQt6.QtCore import *
from PyQt6.QtGui import *
import sys

from aboutdialog import AboutDialog
from ravenui import RavenUI
from settings import Settings
from settingsstore import SettingsStore
from tabs import Tabs

MAX_LINE_LENGTH = 4096

logging.basicConfig(level=logging.INFO)
log = logging.getLogger("main")


class MainWindow(QMainWindow):
    def __init__(self, *args, **kwargs):
        super(MainWindow, self).__init__(*args, **kwargs)

        self.settings = SettingsStore.load()
        self.setWindowTitle(self.tr("RavenLog"))
        self.setGeometry(0, 0, 640, 480)
        self.setDockNestingEnabled(True)

        self.tabs = Tabs(self.settings)
        self.tabs.create_tab("/home/andi/ws/performanceDb/data/production/logs_2018-09-06_2018-09-06.csv")
        self.tabs.create_tab("/home/andi/ws/performanceDb/data/production/vapbdcom.csv")
        self.tabs.create_tab("/home/andi/ws/ravenlog/example.log")
        self.tabs.create_tab("/var/log/syslog")

        self.setCentralWidget(self.tabs)
        # self.main_tool_bar = self.create_main_tool_bar()
        # self.addToolBar(self.main_tool_bar)
        self.setStatusBar(QStatusBar(self))
        self.setMenuBar(self.create_menu_bar())

    def create_main_tool_bar(self):
        result = QToolBar("main toolbar")
        return result

    def update_font_size(self, font_size):
        self.settings.font_size(int(font_size))
        self.tabs.update()

    def create_menu_bar(self) -> QMenuBar:
        menu_bar = QMenuBar()

        menu_bar.addMenu(self.file_menu())
        menu_bar.addMenu(self.help_menu())

        return menu_bar

    def file_menu(self) -> QMenu:
        file_menu = QMenu(self.tr("File", "name of the file menu"), self)

        open_file = QAction(self.tr("Open..."), self)
        open_file.triggered.connect(self._open_file)

        close_action = QAction(self.tr("Close", "menu item to close the application"), self)
        close_action.triggered.connect(self.destruct)

        file_menu.addAction(open_file)
        file_menu.addAction(close_action)
        return file_menu

    def help_menu(self) -> QMenu:
        help_menu = QMenu(self.tr("Help", "name of the help menu"), self)

        about_action = QAction(self.tr("About"), self)
        about_action.triggered.connect(self._open_about_dialog)
        help_menu.addAction(about_action)

        return help_menu

    def _open_about_dialog(self):
        dialog = AboutDialog()
        dialog.exec()

    def _open_file(self) -> None:
        dialog = QFileDialog(self)
        (selected_file, _filter) = dialog.getOpenFileName(caption=self.tr("Open File"))
        self.tabs.create_tab(selected_file)

    def closeEvent(self, event):
        self.destruct()

    def destruct(self):
        self.tabs.destruct()
        self.close()
        SettingsStore.save(self.settings)


def stop_signal(signum, _stackframe):
    """ Handle terminate signal """
    try:
        log.info("Terminate signal received. %s", signum)
        QtCore.QCoreApplication.quit()
    except Exception:
        log.exception("Exception occurred while terminating")
        sys.exit(1)
    sys.exit(0)


if __name__ == "__main__":
    app = QApplication(sys.argv)
    app.setWindowIcon(QIcon("icon6.png"))

    # translator = QTranslator()
    # if translator.load(QLocale("de"), "messages_de.ts"):
    #    app.installTranslator(translator)

    # workaround to make signals work in QT apps.
    # They do not work out of the box, because the main thread
    # is running in C++ code once app.exec() is executed
    # Forcing an empty lambda to be executed periodically gives
    # control back to python and allows python to react to signals
    timer = QTimer()
    timer.timeout.connect(lambda: None)
    timer.start(100)

    window = MainWindow()
    window.show()
    RavenUI.window = window

    signal.signal(signal.SIGINT, stop_signal)
    signal.signal(signal.SIGTERM, stop_signal)

    app.exec()