"""
# ============================================================
# Unloader - plugin for Falkon
# Copyright (C) 2019 Juraj Oravec <sgd.orava@gmail.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
# ============================================================
"""

import Falkon
from PySide2 import QtCore


class UnloaderManager(QtCore.QObject):
    tabs = None
    timer = None
    threshold = None

    def __init__(self, settingsPath, parent=None):
        super().__init__(parent)

        self.tabs = {}
        self.threshold = 15

        self.timer = QtCore.QTimer(self)
        self.timer.setTimerType(QtCore.Qt.VeryCoarseTimer)
        self.timer.setInterval(5000)

        self.timer.timeout.connect(self.onTimeout)

        self.timer.start()

    def onMainWindowCreated(self, window):
        tabs = window.tabWidget().allTabs()

        for tab in tabs:
            self.tabs[tab] = 0

        def onCurrentTabChanged(index):
            tab = window.tabWidget().webTab(index)
            self.tabs[tab] = 0

        window.tabWidget().currentChanged.connect(onCurrentTabChanged)
        window.tabWidget().tabInserted.connect(onCurrentTabChanged)
        window.tabWidget().tabRemoved.connect(self.onTabRemoved)

    def onMainWindowDeleted(self, window):
        tabs = window.tabWidget().allTabs()

        for tab in tabs:
            if tab in self.tabs:
                del self.tabs[tab]

    def onTabRemoved(self, index):
        self.refreshTabList()

    def onTimeout(self):
        if not self.tabs:
            return

        for tab, time in self.tabs.items():
            if tab.isCurrentTab():
                continue
            if not tab.isRestored():
                self.tabs[tab] = 0
                continue

            self.tabs[tab] = time + int(self.timer.interval() / 1000)

            if self.threshold:
                if self.tabs[tab] > self.threshold and tab.isRestored():
                    self.tabs[tab] = 0
                    tab.unload()

    def refreshTabList(self):
        oldTabs = self.tabs.copy()
        self.tabs.clear()

        for window in Falkon.MainApplication.instance().windows():
            winTabs = window.tabWidget().allTabs()

            for tab in winTabs:
                self.tabs[tab] = oldTabs.get(tab, 0)