# This file is part of Xpra.
# Copyright (C) 2012-2019 Antoine Martin <antoine@xpra.org>
# Xpra is released under the terms of the GNU GPL v2, or, at your option, any
# later version. See the file COPYING for details.

from gi.repository import GObject, Gdk, GdkX11

from xpra.util import envint
from xpra.gtk_common.gobject_util import one_arg_signal
from xpra.gtk_common.error import xswallow, xsync, xlog
from xpra.x11.gtk_x11.prop import prop_set, prop_get
from xpra.gtk_common.gtk_util import (
    get_default_root_window, GDKWindow,
    )
from xpra.x11.bindings.window_bindings import constants, X11WindowBindings #@UnresolvedImport
from xpra.x11.gtk_x11.gdk_bindings import (
    add_event_receiver,                          #@UnresolvedImport
    remove_event_receiver,                       #@UnresolvedImport
    )
from xpra.log import Logger

X11Window = X11WindowBindings()

log = Logger("x11", "tray")


CurrentTime = constants["CurrentTime"]
XNone = constants["XNone"]
StructureNotifyMask = constants["StructureNotifyMask"]


XEMBED_VERSION = 0

# XEmbed
XEMBED_EMBEDDED_NOTIFY          = 0
XEMBED_WINDOW_ACTIVATE          = 1
XEMBED_WINDOW_DEACTIVATE        = 2
XEMBED_REQUEST_FOCUS            = 3
XEMBED_FOCUS_IN                 = 4
XEMBED_FOCUS_OUT                = 5
XEMBED_FOCUS_NEXT               = 6
XEMBED_FOCUS_PREV               = 7
# 8-9 were used for XEMBED_GRAB_KEY/XEMBED_UNGRAB_KEY */
XEMBED_MODALITY_ON              = 10
XEMBED_MODALITY_OFF             = 11
XEMBED_REGISTER_ACCELERATOR     = 12
XEMBED_UNREGISTER_ACCELERATOR   = 13
XEMBED_ACTIVATE_ACCELERATOR     = 14
# A detail code is required for XEMBED_FOCUS_IN. The following values are valid:
# Details for  XEMBED_FOCUS_IN:
XEMBED_FOCUS_CURRENT    = 0
XEMBED_FOCUS_FIRST      = 1
XEMBED_FOCUS_LAST       = 2

SELECTION = "_NET_SYSTEM_TRAY_S0"
TRAY_VISUAL = "_NET_SYSTEM_TRAY_VISUAL"
TRAY_ORIENTATION = "_NET_SYSTEM_TRAY_ORIENTATION"

TRAY_ORIENTATION_HORZ   = 0
TRAY_ORIENTATION_VERT   = 1

XPRA_TRAY_WINDOW_PROPERTY = "_xpra_tray_window_"

SYSTEM_TRAY_REQUEST_DOCK = 0
SYSTEM_TRAY_BEGIN_MESSAGE = 1
SYSTEM_TRAY_CANCEL_MESSAGE = 2

#TRANSPARENCY = False
TRANSPARENCY = True

#Java can send this message to the tray (no idea why):
IGNORED_MESSAGE_TYPES = ("_GTK_LOAD_ICONTHEMES", )


MAX_TRAY_SIZE = envint("XPRA_MAX_TRAY_SIZE", 64)


def get_tray_window(tray_window):
    return getattr(tray_window, XPRA_TRAY_WINDOW_PROPERTY, None)

def set_tray_window(tray_window, window):
    setattr(tray_window, XPRA_TRAY_WINDOW_PROPERTY, window.get_xid())

def set_tray_visual(tray_window, gdk_visual):
    prop_set(tray_window, TRAY_VISUAL, "visual", gdk_visual)

def set_tray_orientation(tray_window, orientation):
    prop_set(tray_window, TRAY_ORIENTATION, "u32", orientation)


class SystemTray(GObject.GObject):
    """ This is an X11 system tray area,
        owning the "_NET_SYSTEM_TRAY_S0" selection,
        X11 client applications can request to embed their tray icon in it,
        the xpra server can request to "move_resize" to where the xpra client has it mapped.
    """

    __gsignals__ = {
        "xpra-unmap-event": one_arg_signal,
        "xpra-client-message-event": one_arg_signal,
        }

    def __init__(self):
        GObject.GObject.__init__(self)
        self.tray_window = None
        self.window_trays = {}
        self.tray_windows = {}
        self.setup_tray_window()

    def cleanup(self):
        log("SystemTray.cleanup()")
        root = get_default_root_window()
        def undock(window):
            log("undocking %s", window)
            wxid = window.get_xid()
            rxid = root.get_xid()
            X11Window.Unmap(wxid)
            X11Window.Reparent(wxid, rxid, 0, 0)
        with xlog:
            owner = X11Window.XGetSelectionOwner(SELECTION)
            if owner==self.tray_window.get_xid():
                X11Window.XSetSelectionOwner(0, SELECTION)
                log("SystemTray.cleanup() reset %s selection owner to %#x",
                    SELECTION, X11Window.XGetSelectionOwner(SELECTION))
            else:
                log.warn("Warning: we were no longer the tray selection owner")
        remove_event_receiver(self.tray_window, self)
        tray_windows = self.tray_windows
        self.tray_windows = {}
        for window, tray_window in tray_windows.items():
            with xswallow:
                undock(window)
            tray_window.destroy()
        self.tray_window.destroy()
        self.tray_window = None
        log("SystemTray.cleanup() done")

    def setup_tray_window(self):
        display = Gdk.Display.get_default()
        root = get_default_root_window()
        screen = root.get_screen()
        owner = X11Window.XGetSelectionOwner(SELECTION)
        log("setup tray: current selection owner=%#x", owner)
        if owner!=XNone:
            raise Exception("%s already owned by %s" % (SELECTION, owner))
        visual = screen.get_system_visual()
        if TRANSPARENCY:
            visual = screen.get_rgba_visual()
            if visual is None:
                log.warn("setup tray: using rgb visual fallback")
                visual = screen.get_rgb_visual()
        assert visual is not None, "failed to obtain visual"
        self.tray_window = GDKWindow(root, width=1, height=1,
                                  title="Xpra-SystemTray",
                                  visual=visual)
        xtray = self.tray_window.get_xid()
        set_tray_visual(self.tray_window, visual)
        set_tray_orientation(self.tray_window, TRAY_ORIENTATION_HORZ)
        log("setup tray: tray window %#x", xtray)
        display.request_selection_notification(Gdk.Atom.intern(SELECTION, False))
        try:
            with xsync:
                setsel = X11Window.XSetSelectionOwner(xtray, SELECTION)
                log("setup tray: set selection owner returned %s, owner=%#x",
                    setsel, X11Window.XGetSelectionOwner(SELECTION))
                event_mask = StructureNotifyMask
                log("setup tray: sending client message")
                xid = root.get_xid()
                X11Window.sendClientMessage(xid, xid, False, event_mask, "MANAGER",
                                  CurrentTime, SELECTION, xtray)
                owner = X11Window.XGetSelectionOwner(SELECTION)
                assert owner==xtray, "we failed to get ownership of the tray selection"
                add_event_receiver(self.tray_window, self)
                log("setup tray: done")
        except Exception:
            log("setup_tray failure", exc_info=True)
            self.cleanup()
            raise

    def do_xpra_client_message_event(self, event):
        if event.message_type=="_NET_SYSTEM_TRAY_OPCODE" and event.window==self.tray_window and event.format==32:
            opcode = event.data[1]
            if opcode==SYSTEM_TRAY_REQUEST_DOCK:
                xid = event.data[2]
                log("tray docking request from %#x", xid)
                window = GdkX11.X11Window.foreign_new_for_display(event.display, xid)
                log("tray docking window %s", window)
                if window:
                    from gi.repository import GLib
                    GLib.idle_add(self.dock_tray, xid)
            elif opcode==SYSTEM_TRAY_BEGIN_MESSAGE:
                timeout = event.data[2]
                mlen = event.data[3]
                mid = event.data[4]
                log.info("tray begin message timeout=%s, mlen=%s, mid=%s - not handled yet!", timeout, mlen, mid)
            elif opcode==SYSTEM_TRAY_CANCEL_MESSAGE:
                mid = event.data[2]
                log.info("tray cancel message for mid=%s - not handled yet!", mid)
        elif event.message_type=="_NET_SYSTEM_TRAY_MESSAGE_DATA":
            assert event.format==8
            log.info("tray message data - not handled yet!")
        elif event.message_type in IGNORED_MESSAGE_TYPES:
            log("do_xpra_client_message_event(%s) in ignored message type list", event)
        else:
            log.info("do_xpra_client_message_event(%s)", event)

    def dock_tray(self, xid):
        log("dock_tray(%#x)", xid)
        try:
            with xsync:
                X11Window.getGeometry(xid)
                self.do_dock_tray(xid)
        except Exception as e:
            log.warn("Warning: failed to dock tray %#x:", xid)
            log.warn(" %s", e)
            log.warn(" the application may retry later")

    def do_dock_tray(self, xid):
        root = get_default_root_window()
        window = GdkX11.X11Window.foreign_new_for_display(root.get_display(), xid)
        if window is None:
            log.warn("could not find gdk window for tray window %#x", xid)
            return
        log("dock_tray: root=%s, window=%s", root, window)
        w, h = window.get_geometry()[2:4]
        log("dock_tray: geometry=%s", (w, h))
        if w==0 and h==0:
            log("dock_tray: invalid tray geometry, ignoring this request")
            return
        em = Gdk.EventMask
        event_mask = em.STRUCTURE_MASK | em.EXPOSURE_MASK | em.PROPERTY_CHANGE_MASK
        window.set_events(event_mask=event_mask)
        add_event_receiver(window, self)
        w = max(1, min(MAX_TRAY_SIZE, w))
        h = max(1, min(MAX_TRAY_SIZE, h))
        title = prop_get(window, "_NET_WM_NAME", "utf8", ignore_errors=True)
        if title is None:
            title = prop_get(window, "WM_NAME", "latin1", ignore_errors=True)
        if title is None:
            title = ""
        xid = root.get_xid()
        log("dock_tray(%#x) gdk window=%#x, geometry=%s, title=%s",
            xid, xid, window.get_geometry(), title)
        visual = window.get_visual()
        tray_window = GDKWindow(root, width=w, height=h,
                                           event_mask = event_mask,
                                           title=title,
                                           x=-200, y=-200,
                                           override_redirect=True,
                                           visual=visual)
        log("dock_tray(%#x) setting tray properties", xid)
        set_tray_window(tray_window, window)
        tray_window.show()
        self.tray_windows[window] = tray_window
        self.window_trays[tray_window] = window
        log("dock_tray(%#x) resizing and reparenting", xid)
        window.resize(w, h)
        xwin = window.get_xid()
        xtray = tray_window.get_xid()
        X11Window.Withdraw(xwin)
        X11Window.Reparent(xwin, xtray, 0, 0)
        X11Window.MapRaised(xwin)
        log("dock_tray(%#x) new tray container window %#x", xid, xtray)
        rect = Gdk.Rectangle()
        rect.width = w
        rect.height = h
        tray_window.invalidate_rect(rect, True)
        X11Window.send_xembed_message(xwin, XEMBED_EMBEDDED_NOTIFY, 0, xtray, XEMBED_VERSION)

    def move_resize(self, window, x, y, w, h):
        #see SystemTrayWindowModel.move_resize:
        window.move_resize(x, y, w, h)
        embedded_window = self.window_trays[window.client_window]
        embedded_window.resize(w, h)
        log("system tray moved to %sx%s and resized to %sx%s", x, y, w, h)

    def do_xpra_unmap_event(self, event):
        tray_window = self.tray_windows.get(event.window)
        log("SystemTray.do_xpra_unmap_event(%s) container window=%s", event, tray_window)
        if tray_window:
            tray_window.destroy()
            del self.tray_windows[event.window]
            del self.window_trays[tray_window]

GObject.type_register(SystemTray)
