import gi
gi.require_version("Gtk", "3.0")
from gi.repository import Gdk, GdkPixbuf, Gio, GLib, Gtk

from contextlib import redirect_stdout
from io import StringIO
from subprocess import PIPE, run
from threading import Thread

from auto_cpufreq.core import check_for_update, is_running
from auto_cpufreq.globals import GITHUB, IS_INSTALLED_WITH_SNAP
from auto_cpufreq.gui.objects import CPUFreqStatsLabel, CurrentGovernorBox, DaemonNotRunningView, DropDownMenu, RadioButtonView, SystemStatsLabel, UpdateDialog

if IS_INSTALLED_WITH_SNAP:
    CSS_FILE = "/snap/auto-cpufreq/current/style.css"
    ICON_FILE = "/snap/auto-cpufreq/current/icon.png"
else:
    CSS_FILE = "/usr/local/share/auto-cpufreq/scripts/style.css"
    ICON_FILE = "/usr/local/share/auto-cpufreq/images/icon.png"

HBOX_PADDING = 20
PKEXEC_ERROR = "Error executing command as another user: Not authorized\n\nThis incident has been reported.\n"

class ToolWindow(Gtk.Window):
    def __init__(self):
        super().__init__(title="auto-cpufreq")
        self.set_default_size(600, 480)
        self.set_border_width(10)
        self.set_resizable(False)
        self.load_css()
        pixbuf = GdkPixbuf.Pixbuf.new_from_file_at_scale(filename=ICON_FILE, width=500, height=500, preserve_aspect_ratio=True)
        self.set_icon(pixbuf)
        self.build()

    def main(self):
        # Main HBOX
        self.hbox = Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL, spacing=HBOX_PADDING)
       
        self.systemstats = SystemStatsLabel()
        self.hbox.pack_start(self.systemstats, False, False, 0)
        self.add(self.hbox)

        self.vbox_right = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=52)
        
        self.menu = DropDownMenu(self)
        self.hbox.pack_end(self.menu, False, False, 0)
        
        self.currentgovernor = CurrentGovernorBox()
        self.vbox_right.pack_start(self.currentgovernor, False, False, 0)
        self.vbox_right.pack_start(RadioButtonView(), False, False, 0)

        self.cpufreqstats = CPUFreqStatsLabel()
        self.vbox_right.pack_start(self.cpufreqstats, False, False, 0)

        self.hbox.pack_start(self.vbox_right, False, False, 0)

        GLib.timeout_add_seconds(5, self.refresh_in_thread)

    def snap(self):
        box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, halign=Gtk.Align.CENTER, valign=Gtk.Align.CENTER)
        # reference: https://forum.snapcraft.io/t/pkexec-not-found-python-gtk-gnome-app/36579
        label = Gtk.Label(label="GUI not available due to Snap package confinement limitations.\nPlease install auto-cpufreq using auto-cpufreq-installer\nVisit the GitHub repo for more info")
        label.set_justify(Gtk.Justification.CENTER)
        button = Gtk.LinkButton.new_with_label(
            uri=GITHUB,
            label="GitHub Repo"
        )
        
        box.pack_start(label, False, False, 0)
        box.pack_start(button, False, False, 0)
        self.add(box)

    def handle_update(self):
        new_stdout = StringIO()
        with redirect_stdout(new_stdout):
            if not check_for_update(): return
        captured_output = new_stdout.getvalue().splitlines()
        dialog = UpdateDialog(self, captured_output[1], captured_output[2])
        response = dialog.run()
        dialog.destroy()
        if response != Gtk.ResponseType.YES: return
        updater = run(["pkexec", "auto-cpufreq", "--update"], input="y\n", encoding="utf-8", stderr=PIPE)
        if updater.stderr == PKEXEC_ERROR:
            error = Gtk.MessageDialog(self, 0, Gtk.MessageType.ERROR, Gtk.ButtonsType.OK, "Error updating")
            error.format_secondary_text("Authorization Failed")
            error.run()
            error.destroy()
            return
        success = Gtk.MessageDialog(self, 0, Gtk.MessageType.INFO, Gtk.ButtonsType.OK, "Update successful")
        success.format_secondary_text("The app will now close. Please reopen to apply changes")
        success.run()
        success.destroy()
        exit(0)

    def daemon_not_running(self):
        self.box = DaemonNotRunningView(self)
        self.add(self.box)

    def build(self):
        if IS_INSTALLED_WITH_SNAP: self.snap()
        elif is_running("auto-cpufreq", "--daemon"): self.main()
        else: self.daemon_not_running()

    def load_css(self):
        screen = Gdk.Screen.get_default()
        self.gtk_provider = Gtk.CssProvider()
        self.gtk_context = Gtk.StyleContext()
        self.gtk_context.add_provider_for_screen(screen, self.gtk_provider, Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION)
        self.gtk_provider.load_from_file(Gio.File.new_for_path(CSS_FILE))

    def refresh_in_thread(self):
        Thread(target=self._refresh).start()
        return True

    def _refresh(self):
        self.systemstats.refresh()
        self.currentgovernor.refresh()
        self.cpufreqstats.refresh()