"""
# ============================================================
# 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
import os
from PySide2 import QtCore
from unloader.settingsDialog import SettingsDialog


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

    configChanged = QtCore.Signal()

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

        self.config = {
            "settingsFile": os.path.join(settingsPath, "unloader", "settings.ini"),
            "threshold": 600,
            "closeThreshold": 0,
            "updateInterval": 5
        }
        self.loadSettings()

        self.tabs = {}

        self.timer = QtCore.QTimer(self)
        self.timer.setTimerType(QtCore.Qt.VeryCoarseTimer)
        self.timer.setInterval(self.config["updateInterval"] * 1000)
        self.timer.timeout.connect(self.onTimeout)
        self.timer.start()

        self.configChanged.connect(self.onConfigChanged)

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

        for tab in tabs:
            self.tabs[tab] = 0
            tab.restoredChanged.connect(
                lambda r: self.onTabRestoredChanged(tab, r)
            )

        window.tabWidget().currentChanged.connect(
            lambda index: self.onCurrentTabChanged(window, index)
        )
        window.tabWidget().tabInserted.connect(
            lambda index: self.onCurrentTabChanged(window, index, True)
        )
        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 onCurrentTabChanged(self, window, index, new=False):
        tab = window.tabWidget().webTab(index)
        self.tabs[tab] = 0

        if new:
            tab.restoredChanged.connect(
                lambda r: self.onTabRestoredChanged(tab, r)
            )

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

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

        for tab, time in list(self.tabs.items()):
            if tab.isCurrentTab():
                continue

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

            if not tab.isRestored() and self.config["closeThreshold"]:
                if self.tabs[tab] > self.config["closeThreshold"]:
                    del self.tabs[tab]
                    tab.closeTab()
                continue

            if self.config["threshold"]:
                if self.tabs[tab] > self.config["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)

                if tab not in oldTabs:
                    tab.restoredChanged.connect(
                        lambda r: self.onTabRestoredChanged(tab, r)
                    )

    def loadSettings(self):
        settings = QtCore.QSettings(self.config["settingsFile"], QtCore.QSettings.IniFormat)

        settings.beginGroup("Unloader")
        self.config["threshold"] = int(settings.value("threshold", self.config["threshold"]))
        self.config["closeThreshold"] = int(
            settings.value("closeThreshold", self.config["closeThreshold"])
        )
        self.config["updateInterval"] = int(
            settings.value("defaultZoom", self.config["updateInterval"])
        )
        settings.endGroup()

    def saveSettings(self):
        settings = QtCore.QSettings(self.config["settingsFile"], QtCore.QSettings.IniFormat)

        settings.beginGroup("Unloader")
        settings.setValue("threshold", self.config["threshold"])
        settings.setValue("closeThreshold", self.config["closeThreshold"])
        settings.setValue("updateInterval", self.config["updateInterval"])
        settings.endGroup()

        settings.sync()

    def showSettings(self, parent=None):
        settings = SettingsDialog(self.config, parent)
        settings.accepted.connect(self.saveSettings)
        settings.accepted.connect(self.configChanged)
        settings.exec_()

    def onConfigChanged(self):
        self.timer.setInterval(self.config["updateInterval"] * 1000)

    def onTabRestoredChanged(self, tab, restored):
        self.tabs[tab] = 0