import sys
import os

from PyQt5.QtWidgets import QMainWindow, QApplication, QFileDialog, QProgressBar, QMessageBox, QInputDialog, QLineEdit
from PyQt5.QtGui import QIcon
from helpers.config import Config
from threads.Sign import Sign
from gui.SettingsDialog import SettingsDialog
from gui.AboutDialog import AboutDialog

from ui.mainwindow import Ui_MainWindow

# Program dependent variables
app_root = os.path.dirname(os.path.abspath(__file__))
config_file = 'ordersguru_signer.ini'


# Main window class
class MainWindow(QMainWindow):
    def __init__(self, parent=None):
        QMainWindow.__init__(self, parent)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)
        self.setWindowIcon(QIcon(os.path.join(app_root, 'resources', 'icon.ico')))
        self.progressBar = QProgressBar(self)
        self.progressBar.setRange(0, 1)
        self.ui.statusbar.addPermanentWidget(self.progressBar)

        self.config = Config(config_file)

        self.set_connections()
        self.check_config()
        self.ui.statusbar.showMessage('Ready for signing')

    def set_connections(self):
        self.ui.action_Settings.triggered.connect(lambda: self.show_settings(self.config.get_data()))
        self.ui.action_About.triggered.connect(lambda: AboutDialog.show_(self))
        self.ui.action_Quit.triggered.connect(self.close)
        self.ui.btnDirectoryBrowse.clicked.connect(self.browse_directory)
        self.ui.btnFileBrowse.clicked.connect(self.browse_file)
        self.ui.btnDirectorySignArrange.clicked.connect(self.sign_directory)
        self.ui.btnFileSign.clicked.connect(self.sign_file)

    def check_config(self):
        if not self.config.exists():
            self.show_settings(initial=True)
        elif not self.config.verify_data():
            self.show_settings(self.config.get_data(), False, self.config.get_errors())

    def show_settings(self, config=None, initial=False, errors=None):
        config, success = SettingsDialog.get_data(self, config, initial, errors)
        if success:
            try:
                self.config.save_data(config)
            except BaseException as e:
                self.show_message((str(e), False))
                sys.exit()
        elif initial or errors:
            sys.exit()

    def browse_directory(self):
        fbrowser = QFileDialog(self)
        fbrowser.selectFile(self.ui.leDirectory.displayText())
        fbrowser.setFileMode(QFileDialog.DirectoryOnly)
        if fbrowser.exec_():
            self.ui.leDirectory.setText(fbrowser.selectedFiles()[0])
            self.ui.btnDirectorySignArrange.setEnabled(True)

    def sign_directory(self):
        password = self.get_password()
        if password:
            self.ui.btnDirectorySignArrange.setEnabled(False)
            self.ui.statusbar.showMessage('Signing & arranging ...')
            self.progressBar.setRange(0, 0)
            sign = Sign(self, {
                'directory': self.ui.leDirectory.displayText(),
                'config': self.config.get_data(),
                'password': password
            })
            sign.status_bar_signal.connect(self.ui.statusbar.showMessage)
            sign.sign_button_signal.connect(self.ui.btnDirectorySignArrange.setEnabled)
            sign.progress_bar_signal.connect(self.set_progress)
            sign.message_signal.connect(self.show_message)
            sign.start()

    def browse_file(self):
        fbrowser = QFileDialog(self)
        fbrowser.selectFile(self.ui.leFile.displayText())
        fbrowser.setFileMode(QFileDialog.ExistingFile)
        fbrowser.setNameFilter('XML files (*.xml)')
        if fbrowser.exec_():
            self.ui.leFile.setText(fbrowser.selectedFiles()[0])
            self.ui.btnFileSign.setEnabled(True)

    def sign_file(self):
        password = self.get_password()
        if password:
            self.ui.btnFileSign.setEnabled(False)
            self.ui.statusbar.showMessage('Signing ...')
            self.progressBar.setRange(0, 0)
            sign = Sign(self, {
                'file': self.ui.leFile.displayText(),
                'config': self.config.get_data(),
                'password': password
            })
            sign.status_bar_signal.connect(self.ui.statusbar.showMessage)
            sign.sign_button_signal.connect(self.ui.btnFileSign.setEnabled)
            sign.progress_bar_signal.connect(self.set_progress)
            sign.message_signal.connect(self.show_message)
            sign.start()

    def set_progress(self, in_progress):
        self.progressBar.setRange(0, 0 if in_progress else 1)

    def show_message(self, message):
        msg, success = message
        error = QMessageBox(self)
        error.setIcon(QMessageBox.Information if success else QMessageBox.Critical)
        error.setWindowTitle('Success' if success else 'Error')
        error.setText(msg)
        error.setStandardButtons(QMessageBox.Ok)
        error.exec_()
        self.ui.statusbar.showMessage('Ready for signing')

    def get_password(self):
        password, success = QInputDialog.getText(
            self,
            'Certificate password',
            'Please enter certificate password:',
            echo=QLineEdit.Password
        )
        if success:
            return password
        return False

# Run program by default
if __name__ == '__main__':
    app = QApplication(sys.argv)
    og_signer = MainWindow()
    og_signer.show()
    sys.exit(app.exec_())