# This file is part of Xpra.
# Copyright (C) 2010-2015 Antoine Martin <antoine@devloop.org.uk>
# Copyright (C) 2008, 2010 Nathaniel Smith <njs@pobox.com>
# 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 xpra.gtk_common.gobject_compat import import_gobject, import_glib
gobject = import_gobject()
glib = import_glib()

from xpra.log import Logger
log = Logger("gobject", "client")

import os
import sys
from xpra.util import nonl, sorted_nicely, print_nested_dict, DONE
from xpra.os_util import bytestostr
from xpra.client.client_base import XpraClientBase, EXTRA_TIMEOUT, \
    EXIT_TIMEOUT, EXIT_OK, EXIT_UNSUPPORTED, EXIT_REMOTE_ERROR, EXIT_FILE_TOO_BIG

FLATTEN_INFO = int(os.environ.get("XPRA_FLATTEN_INFO", "1"))


class GObjectXpraClient(XpraClientBase, gobject.GObject):
    """
        Utility superclass for GObject clients
    """

    def __init__(self):
        gobject.GObject.__init__(self)
        XpraClientBase.__init__(self)

    def init(self, opts):
        XpraClientBase.init(self, opts)
        self.install_signal_handlers()
        self.glib_init()
        self.gobject_init()

    def timeout_add(self, *args):
        return glib.timeout_add(*args)

    def idle_add(self, *args):
        return glib.idle_add(*args)

    def source_remove(self, *args):
        return glib.source_remove(*args)

    def get_scheduler(self):
        return glib


    def client_type(self):
        #overriden in subclasses!
        return "Python%s/GObject" % sys.version_info[0]

    def timeout(self, *args):
        log.warn("timeout!")

    def init_packet_handlers(self):
        XpraClientBase.init_packet_handlers(self)
        def noop(*args):
            log("ignoring packet: %s", args)
        #ignore the following packet types without error:
        #(newer servers should avoid sending us any of those)
        for t in ["new-window", "new-override-redirect",
                  "draw", "cursor", "bell",
                  "notify_show", "notify_close",
                  "ping", "ping_echo",
                  "window-metadata", "configure-override-redirect",
                  "lost-window"]:
            self._packet_handlers[t] = noop

    def gobject_init(self):
        try:
            gobject.threads_init()
        except AttributeError:
            #old versions of gobject may not have this method
            pass

    def connect_with_timeout(self, conn):
        self.setup_connection(conn)
        if conn.timeout>0:
            glib.timeout_add((conn.timeout + EXTRA_TIMEOUT) * 1000, self.timeout)
        glib.idle_add(self.send_hello)

    def run(self):
        XpraClientBase.run(self)
        self.glib_mainloop = glib.MainLoop()
        self.glib_mainloop.run()
        return  self.exit_code

    def make_hello(self):
        capabilities = XpraClientBase.make_hello(self)
        capabilities["keyboard"] = False
        return capabilities

    def quit(self, exit_code):
        log("quit(%s) current exit_code=%s", exit_code, self.exit_code)
        if self.exit_code is None:
            self.exit_code = exit_code
        self.cleanup()
        glib.timeout_add(50, self.glib_mainloop.quit)



class CommandConnectClient(GObjectXpraClient):
    """
        Utility superclass for clients that only send one command
        via the hello packet.
    """

    def __init__(self, conn, opts):
        GObjectXpraClient.__init__(self)
        GObjectXpraClient.init(self, opts)
        self.connect_with_timeout(conn)
        self._protocol._log_stats  = False
        #not used by command line clients,
        #so don't try probing for printers, etc
        self.file_transfer = False
        self.printing = False

    def make_hello(self):
        capabilities = GObjectXpraClient.make_hello(self)
        #don't bother with many of these things for one-off commands:
        for x in ("ui_client", "wants_aliases", "wants_encodings",
                  "wants_versions", "wants_features", "wants_sound", "windows"):
            capabilities[x] = False
        return capabilities

    def _process_connection_lost(self, packet):
        #override so we don't log a warning
        #"command clients" are meant to exit quickly by losing the connection
        self.quit(EXIT_OK)

    def server_connection_established(self):
        #don't bother parsing the network caps:
        #* it could cause errors if the caps are missing
        #* we don't care about sending anything back after hello
        log("server_capabilities: %s", self.server_capabilities)
        log("protocol state: %s", self._protocol.save_state())
        self.do_command()

    def do_command(self):
        raise NotImplementedError()


class SendCommandConnectClient(CommandConnectClient):
    """
        Utility superclass for clients that only send at least one more packet
        after the hello packet.
        So unlike CommandConnectClient, we do need the network and encryption to be setup.
    """

    def server_connection_established(self):
        assert self.parse_encryption_capabilities(), "encryption failure"
        assert self.parse_network_capabilities(), "network capabilities failure"
        CommandConnectClient.server_connection_established(self)


class ScreenshotXpraClient(CommandConnectClient):
    """ This client does one thing only:
        it sends the hello packet with a screenshot request
        and exits when the resulting image is received (or timedout)
    """

    def __init__(self, conn, opts, screenshot_filename):
        self.screenshot_filename = screenshot_filename
        CommandConnectClient.__init__(self, conn, opts)

    def timeout(self, *args):
        self.warn_and_quit(EXIT_TIMEOUT, "timeout: did not receive the screenshot")

    def _process_screenshot(self, packet):
        (w, h, encoding, _, img_data) = packet[1:6]
        assert encoding=="png"
        if len(img_data)==0:
            self.warn_and_quit(EXIT_OK, "screenshot is empty and has not been saved (maybe there are no windows or they are not currently shown)")
            return
        with open(self.screenshot_filename, 'wb') as f:
            f.write(img_data)
        self.warn_and_quit(EXIT_OK, "screenshot %sx%s saved to: %s" % (w, h, self.screenshot_filename))

    def init_packet_handlers(self):
        GObjectXpraClient.init_packet_handlers(self)
        self._ui_packet_handlers["screenshot"] = self._process_screenshot

    def make_hello(self):
        capabilities = GObjectXpraClient.make_hello(self)
        capabilities["screenshot_request"] = True
        return capabilities


class InfoXpraClient(CommandConnectClient):
    """ This client does one thing only:
        it queries the server with an 'info' request
    """

    def timeout(self, *args):
        self.warn_and_quit(EXIT_TIMEOUT, "timeout: did not receive the info")

    def do_command(self):
        if self.server_capabilities:
            if FLATTEN_INFO<2:
                #compatibility mode:
                for k in sorted_nicely(self.server_capabilities.keys()):
                    v = self.server_capabilities.get(k)
                    if sys.version_info[0]>=3:
                        #FIXME: this is a nasty and horrible python3 workaround (yet again)
                        #we want to print bytes as strings without the ugly 'b' prefix..
                        #it assumes that all the strings are raw or in (possibly nested) lists or tuples only
                        def fixvalue(w):
                            if type(w)==bytes:
                                return bytestostr(w)
                            elif type(w) in (tuple,list):
                                return type(w)([fixvalue(x) for x in w])
                            return w
                        v = fixvalue(v)
                    log.info("%s=%s", bytestostr(k), nonl(v))
            else:
                print_nested_dict(self.server_capabilities)
        self.quit(EXIT_OK)

    def make_hello(self):
        capabilities = GObjectXpraClient.make_hello(self)
        log("make_hello() adding info_request to %s", capabilities)
        capabilities["info_request"] = True
        if FLATTEN_INFO!=1:
            capabilities["info-namespace"] = True
        return capabilities


class MonitorXpraClient(SendCommandConnectClient):
    """ This client does one thing only:
        it prints out events received from the server.
        If the server does not support this feature it exits with an error.
    """

    def timeout(self, *args):
        pass
        #self.warn_and_quit(EXIT_TIMEOUT, "timeout: did not receive the info")

    def do_command(self):
        log.info("waiting for server events")

    def _process_server_event(self, packet):
        log.info(": ".join(packet[1:]))

    def init_packet_handlers(self):
        SendCommandConnectClient.init_packet_handlers(self)
        self._packet_handlers["server-event"] = self._process_server_event
        self._packet_handlers["ping"] = self._process_ping

    def make_hello(self):
        capabilities = SendCommandConnectClient.make_hello(self)
        log("make_hello() adding info_request to %s", capabilities)
        capabilities["wants_features"]  = True      #so we can verify that the server supports monitor mode
        capabilities["wants_events"]    = True      #tell the server we do support server events
        capabilities["event_request"]   = True      #ask the server to enter this request mode (we're not a proper client)
        return capabilities

    def _process_ping(self, packet):
        echotime = packet[1]
        self.send("ping_echo", echotime, 0, 0, 0, -1)


class VersionXpraClient(CommandConnectClient):
    """ This client does one thing only:
        it queries the server for version information and prints it out
    """

    def timeout(self, *args):
        self.warn_and_quit(EXIT_TIMEOUT, "timeout: did not receive the version")

    def do_command(self):
        self.warn_and_quit(EXIT_OK, str(self.server_capabilities.get("version")))

    def make_hello(self):
        capabilities = GObjectXpraClient.make_hello(self)
        log("make_hello() adding version_request to %s", capabilities)
        capabilities["version_request"] = True
        return capabilities


class ControlXpraClient(CommandConnectClient):
    """ Allows us to send commands to a server.
    """
    def set_command_args(self, command):
        self.command = command

    def timeout(self, *args):
        self.warn_and_quit(EXIT_TIMEOUT, "timeout: server did not respond")

    def do_command(self):
        cr = self.server_capabilities.listget("command_response")
        if cr is None:
            self.warn_and_quit(EXIT_UNSUPPORTED, "server does not support control command")
            return
        code, text = cr
        text = bytestostr(text)
        if code!=0:
            log.warn("server returned error code %s", code)
            self.warn_and_quit(EXIT_REMOTE_ERROR, " %s" % text)
            return
        self.warn_and_quit(EXIT_OK, text)

    def make_hello(self):
        capabilities = GObjectXpraClient.make_hello(self)
        log("make_hello() adding command request '%s' to %s", self.command, capabilities)
        capabilities["command_request"] = self.command
        return capabilities


class PrintClient(SendCommandConnectClient):
    """ Allows us to send a file to the server for printing.
    """
    def set_command_args(self, command):
        log("set_command_args(%s)", command)
        self.filename = command[0]
        #print command arguments:
        #filename, file_data, mimetype, source_uuid, title, printer, no_copies, print_options_str = packet[1:9]
        self.command = command[1:]
        #FIXME: load as needed...
        from xpra.os_util import load_binary_file
        if self.filename=="-":
            #replace with filename proposed
            self.filename = command[2]
            #read file from stdin
            self.file_data = sys.stdin.read()
            log("read %i bytes from stdin", len(self.file_data))
        else:
            self.file_data = load_binary_file(self.filename)
            log("read %i bytes from %s", len(self.file_data), self.filename)
        if len(self.file_data)>=self.file_size_limit*1024*1024:
            self.warn_and_quit(EXIT_FILE_TOO_BIG, "the file is too large: %iMB (the file size limit is %iMB)" % (len(self.file_data)//1024//1024, self.file_size_limit))
            return
        assert self.file_data, "no data found for '%s'" % self.filename

    def client_type(self):
        return "Python/GObject/Print"

    def timeout(self, *args):
        self.warn_and_quit(EXIT_TIMEOUT, "timeout: server did not respond")

    def do_command(self):
        printing = self.server_capabilities.boolget("printing")
        if not printing:
            self.warn_and_quit(EXIT_UNSUPPORTED, "server does not support printing")
            return
        #TODO: compress file data? (this should run locally most of the time anyway)
        from xpra.net.compression import Compressed
        blob = Compressed("print", self.file_data)
        self.send("print", self.filename, blob, *self.command)
        log("print: sending %s as %s for printing", self.filename, blob)
        self.idle_add(self.send, "disconnect", DONE, "detaching")

    def make_hello(self):
        capabilities = SendCommandConnectClient.make_hello(self)
        capabilities["wants_features"] = True   #so we know if printing is supported or not
        capabilities["print_request"] = True    #marker to skip full setup
        return capabilities


class ExitXpraClient(SendCommandConnectClient):
    """ This client does one thing only:
        it asks the server to terminate (like stop),
        but without killing the Xvfb or clients.
    """

    def timeout(self, *args):
        self.warn_and_quit(EXIT_TIMEOUT, "timeout: server did not disconnect us")

    def make_hello(self):
        capabilities = SendCommandConnectClient.make_hello(self)
        capabilities["exit_request"] = True
        return capabilities

    def do_command(self):
        self.idle_add(self.send, "exit-server")


class StopXpraClient(SendCommandConnectClient):
    """ stop a server """

    def make_hello(self):
        #used for telling the proxy server we want "stop"
        #(as waiting for the hello back would be too late)
        capabilities = SendCommandConnectClient.make_hello(self)
        capabilities["stop_request"] = True
        return capabilities

    def timeout(self, *args):
        self.warn_and_quit(EXIT_TIMEOUT, "timeout: server did not disconnect us")

    def do_command(self):
        self.idle_add(self.send, "shutdown-server")
        #not exiting the client here,
        #the server should send us the shutdown disconnection message anyway
        #and if not, we will then hit the timeout to tell us something went wrong

class DetachXpraClient(SendCommandConnectClient):
    """ run the detach subcommand """

    def make_hello(self):
        #used for telling the proxy server we want "detach"
        #(older versions ignore this flag and detach because this is a new valid connection
        # but this breaks if sharing is enabled!)
        capabilities = SendCommandConnectClient.make_hello(self)
        capabilities["detach_request"] = True
        return capabilities

    def timeout(self, *args):
        self.warn_and_quit(EXIT_TIMEOUT, "timeout: server did not disconnect us")

    def do_command(self):
        self.idle_add(self.send, "disconnect", DONE, "detaching")
        #not exiting the client here,
        #the server should disconnect us with the response
