import logging
from pathlib import Path

from PyQt5 import QtCore, uic
from PyQt5.QtCore import QPoint
from PyQt5.QtGui import QFontMetrics, QKeySequence
from PyQt5.QtWidgets import (QCheckBox, QFileDialog, QMenu, QMessageBox,
                             QShortcut, QToolTip)

from vorta.profile_export import ImportFailedException, ProfileExport
from vorta.store.models import BackupProfileModel, SettingsModel
from vorta.utils import (borg_compat, get_asset, get_network_status_monitor,
                         is_system_tray_available)
from vorta.views.partials.loading_button import LoadingButton
from vorta.views.utils import get_colored_icon

from .archive_tab import ArchiveTab
from .export_window import ExportWindow
from .import_window import ImportWindow
from .misc_tab import MiscTab
from .profile_add_edit_dialog import AddProfileWindow, EditProfileWindow
from .repo_tab import RepoTab
from .schedule_tab import ScheduleTab
from .source_tab import SourceTab

uifile = get_asset('UI/mainwindow.ui')
MainWindowUI, MainWindowBase = uic.loadUiType(uifile)

logger = logging.getLogger(__name__)


class MainWindow(MainWindowBase, MainWindowUI):
    def __init__(self, parent=None):
        super().__init__()
        self.setupUi(self)
        self.setWindowTitle('Vorta for Borg Backup')
        self.app = parent
        self.setWindowIcon(get_colored_icon("icon"))
        self.setWindowFlags(QtCore.Qt.WindowCloseButtonHint | QtCore.Qt.WindowMinimizeButtonHint)
        self.createStartBtn = LoadingButton(self.tr("Start Backup"))
        self.gridLayout.addWidget(self.createStartBtn, 0, 0, 1, 1)
        self.createStartBtn.setGif(get_asset("icons/loading"))

        # set log label height to two lines
        fontmetrics: QFontMetrics = self.logText.fontMetrics()
        self.logText.setMinimumHeight(
            fontmetrics.lineSpacing() * 2 + fontmetrics.leading())

        # Use previous window state
        previous_window_width = SettingsModel.get(key='previous_window_width')
        previous_window_height = SettingsModel.get(key='previous_window_height')
        self.resize(int(previous_window_width.str_value), int(previous_window_height.str_value))

        # Select previously used profile, if available
        prev_profile_id = SettingsModel.get(key='previous_profile_id')
        self.current_profile = BackupProfileModel.get_or_none(id=prev_profile_id.str_value)
        if self.current_profile is None:
            self.current_profile = BackupProfileModel.select().order_by('name').first()

        # Load tab models
        self.repoTab = RepoTab(self.repoTabSlot)
        self.sourceTab = SourceTab(self.sourceTabSlot)
        self.archiveTab = ArchiveTab(self.archiveTabSlot, app=self.app)
        self.scheduleTab = ScheduleTab(self.scheduleTabSlot)
        self.miscTab = MiscTab(self.miscTabSlot)
        self.miscTab.set_borg_details(borg_compat.version, borg_compat.path)
        self.tabWidget.setCurrentIndex(0)

        self.repoTab.repo_changed.connect(self.archiveTab.populate_from_profile)
        self.repoTab.repo_changed.connect(self.scheduleTab.populate_from_profile)
        self.repoTab.repo_added.connect(self.archiveTab.refresh_archive_list)

        self.createStartBtn.clicked.connect(self.app.create_backup_action)
        self.cancelButton.clicked.connect(self.app.backup_cancelled_event.emit)

        QShortcut(QKeySequence("Ctrl+W"), self).activated.connect(self.on_close_window)
        QShortcut(QKeySequence("Ctrl+Q"), self).activated.connect(self.on_close_window)

        self.app.backup_started_event.connect(self.backup_started_event)
        self.app.backup_finished_event.connect(self.backup_finished_event)
        self.app.backup_log_event.connect(self.set_log)
        self.app.backup_progress_event.connect(self.set_progress)
        self.app.backup_cancelled_event.connect(self.backup_cancelled_event)

        # Init profile list
        self.populate_profile_selector()
        self.profileSelector.currentIndexChanged.connect(self.profile_select_action)
        self.profileRenameButton.clicked.connect(self.profile_rename_action)
        self.profileExportButton.clicked.connect(self.profile_export_action)
        self.profileDeleteButton.clicked.connect(self.profile_delete_action)
        profile_add_menu = QMenu()
        profile_add_menu.addAction(self.tr('Import from file…'), self.profile_import_action)
        self.profileAddButton.setMenu(profile_add_menu)
        self.profileAddButton.clicked.connect(self.profile_add_action)

        # OS-specific startup options:
        if not get_network_status_monitor().is_network_status_available():
            # Hide Wifi-rule section in schedule tab.
            self.scheduleTab.wifiListLabel.hide()
            self.scheduleTab.wifiListWidget.hide()
            self.scheduleTab.page_2.hide()
            self.scheduleTab.toolBox.removeItem(1)

        # Connect to existing thread.
        if self.app.jobs_manager.is_worker_running():
            self.createStartBtn.setEnabled(False)
            self.createStartBtn.start()
            self.cancelButton.setEnabled(True)

        self.set_icons()

    def on_close_window(self):
        self.close()

    def set_icons(self):
        self.profileAddButton.setIcon(get_colored_icon('plus'))
        self.profileRenameButton.setIcon(get_colored_icon('edit'))
        self.profileExportButton.setIcon(get_colored_icon('file-import-solid'))
        self.profileDeleteButton.setIcon(get_colored_icon('trash'))

    def set_progress(self, text=''):
        self.progressText.setText(text)
        self.progressText.repaint()

    def set_log(self, text=''):
        self.logText.setText(text)
        self.logText.repaint()

    def _toggle_buttons(self, create_enabled=True):
        if create_enabled:
            self.createStartBtn.stop()
        else:
            self.createStartBtn.start()
        self.createStartBtn.setEnabled(create_enabled)
        self.createStartBtn.repaint()
        self.cancelButton.setEnabled(not create_enabled)
        self.cancelButton.repaint()

    def populate_profile_selector(self):
        self.profileSelector.clear()
        for profile in BackupProfileModel.select().order_by(BackupProfileModel.name):
            self.profileSelector.addItem(profile.name, profile.id)
        current_profile_index = self.profileSelector.findData(self.current_profile.id)
        self.profileSelector.setCurrentIndex(current_profile_index)

    def profile_select_action(self, index):
        backup_profile_id = self.profileSelector.currentData()
        if not backup_profile_id:
            return
        self.current_profile = BackupProfileModel.get(id=backup_profile_id)
        self.archiveTab.populate_from_profile()
        self.repoTab.populate_from_profile()
        self.sourceTab.populate_from_profile()
        self.scheduleTab.populate_from_profile()
        SettingsModel.update({SettingsModel.str_value: self.current_profile.id}) \
            .where(SettingsModel.key == 'previous_profile_id') \
            .execute()

    def profile_rename_action(self):
        window = EditProfileWindow(rename_existing_id=self.profileSelector.currentData())
        self.window = window  # For tests
        window.setParent(self, QtCore.Qt.Sheet)
        window.open()
        window.profile_changed.connect(self.profile_add_edit_result)
        window.rejected.connect(lambda: self.profileSelector.setCurrentIndex(self.profileSelector.currentIndex()))

    def profile_delete_action(self):
        if self.profileSelector.count() > 1:
            to_delete_id = self.profileSelector.currentData()
            to_delete = BackupProfileModel.get(id=to_delete_id)

            msg = self.tr("Are you sure you want to delete profile '{}'?".format(to_delete.name))
            reply = QMessageBox.question(self, self.tr("Confirm deletion"),
                                         msg, QMessageBox.Yes | QMessageBox.No, QMessageBox.No)

            if reply == QMessageBox.Yes:
                to_delete.delete_instance(recursive=True)
                self.app.scheduler.remove_job(to_delete_id)  # Remove pending jobs
                self.profileSelector.removeItem(self.profileSelector.currentIndex())
                self.profile_select_action(0)

        else:
            warn = self.tr("Cannot delete the last profile.")
            point = QPoint(0, self.profileDeleteButton.size().height() / 2)
            QToolTip.showText(self.profileDeleteButton.mapToGlobal(point), warn)

    def profile_add_action(self):
        window = AddProfileWindow()
        self.window = window  # For tests
        window.setParent(self, QtCore.Qt.Sheet)
        window.open()
        window.profile_changed.connect(self.profile_add_edit_result)
        window.rejected.connect(lambda: self.profileSelector.setCurrentIndex(self.profileSelector.currentIndex()))

    def profile_export_action(self):
        """
        React to pressing "Export Profile" button and save current
        profile as .json file.
        """
        window = ExportWindow(profile=self.current_profile.refresh())
        self.window = window
        window.setParent(self, QtCore.Qt.Sheet)
        window.show()

    def profile_import_action(self):
        """
        React to "Import Profile". Ask to select a .json file and import it as
        new profile.
        """
        def profile_imported_event(profile):
            QMessageBox.information(None,
                                    self.tr('Profile import successful!'),
                                    self.tr('Profile {} imported.').format(profile.name))
            self.repoTab.populate_repositories()
            self.scheduleTab.populate_logs()
            self.scheduleTab.populate_wifi()
            self.miscTab.populate()
            self.populate_profile_selector()

        filename = QFileDialog.getOpenFileName(
            self,
            self.tr("Load profile"),
            str(Path.home()),
            self.tr("JSON (*.json);;All files (*)"))[0]
        if filename:
            try:
                profile_export = ProfileExport.from_json(filename)
            except ImportFailedException as exception:
                QMessageBox.critical(None,
                                     self.tr('Failed to import profile'),
                                     str(exception))
                return
            window = ImportWindow(profile_export=profile_export)
            self.window = window
            window.setParent(self, QtCore.Qt.Sheet)
            window.profile_imported.connect(profile_imported_event)
            window.show()

    def profile_add_edit_result(self, profile_name, profile_id):
        # Profile is renamed
        if self.profileSelector.currentData() == profile_id:
            self.profileSelector.setItemText(self.profileSelector.currentIndex(), profile_name)
        # Profile is added
        else:
            self.profileSelector.addItem(profile_name, profile_id)
            self.profileSelector.setCurrentIndex(self.profileSelector.count() - 1)

    def backup_started_event(self):
        self._toggle_buttons(create_enabled=False)
        self.archiveTab._toggle_all_buttons(enabled=False)
        self.set_log('')

    def backup_finished_event(self):
        self.archiveTab.populate_from_profile()
        self.repoTab.init_repo_stats()
        self.scheduleTab.populate_logs()

        if not self.app.jobs_manager.is_worker_running():
            self._toggle_buttons(create_enabled=True)
            self.archiveTab._toggle_all_buttons(enabled=True)

    def backup_cancelled_event(self):
        self._toggle_buttons(create_enabled=True)
        self.set_log(self.tr('Task cancelled'))
        self.archiveTab.cancel_action()

    def closeEvent(self, event):
        # Save window state in SettingsModel
        SettingsModel.update({SettingsModel.str_value: str(self.width())}) \
            .where(SettingsModel.key == 'previous_window_width') \
            .execute()
        SettingsModel.update({SettingsModel.str_value: str(self.height())}) \
            .where(SettingsModel.key == 'previous_window_height') \
            .execute()

        if not is_system_tray_available():
            if SettingsModel.get(key="enable_background_question").value:
                msg = QMessageBox()
                msg.setStandardButtons(QMessageBox.Yes | QMessageBox.No)
                msg.setParent(self, QtCore.Qt.Sheet)
                msg.setText(self.tr("Should Vorta continue to run in the background?"))
                msg.button(QMessageBox.Yes).clicked.connect(
                    lambda: self.miscTab.save_setting("disable_background_state", True))
                msg.button(QMessageBox.No).clicked.connect(lambda: (self.miscTab.save_setting(
                    "disable_background_state", False), self.app.quit()))
                msg.setWindowTitle(self.tr("Quit"))
                dont_show_box = QCheckBox(self.tr("Don't show this again"))
                dont_show_box.clicked.connect(lambda x: self.miscTab.save_setting("enable_background_question", not x))
                dont_show_box.setTristate(False)
                msg.setCheckBox(dont_show_box)
                msg.exec()
            elif not SettingsModel.get(key="disable_background_state").value:
                self.app.quit()
        event.accept()
