import logging
import os
import re
import signal

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

from bigtext import BigText
from logFileModel import LogFileModel
from settings import Settings
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 = Settings()
        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.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")

        result.addWidget(QLabel(self.tr("Font Size:")))
        font_size = QComboBox(result)
        for s in range(3,30):
            font_size.addItem(str(s))
        font_size.setCurrentText(str(self.settings.get_font_size()))
        font_size.currentTextChanged.connect(self.update_font_size)
        result.addWidget(font_size)

        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()

        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)

        menu_bar.addMenu(file_menu)

        return menu_bar

    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()


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)

    #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(500)

    window = MainWindow()
    window.show()

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

    app.exec()