# Copyright (C) 2013 Daniel Narvaez
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.

import json
import os

from gi.repository import Gdk
from gi.repository import GConf
from gi.repository import Gio
from gi.repository import WebKit2
from gwebsockets.server import Server

from sugar3.activity import activity


class ActivityAPI:
    def __init__(self, activity):
        self._activity = activity

    def get_xo_color(self):
        client = GConf.Client.get_default()
        color_string = client.get_string('/desktop/sugar/user/color')
        return color_string.split(",")

    def close(self):
        self._activity.close()


class HTMLActivity(activity.Activity):
    def __init__(self, handle):
        activity.Activity.__init__(self, handle)

        self.connect("key-press-event", self._key_press_event_cb)

        context = WebKit2.WebContext.get_default()
        context.register_uri_scheme("activity", self._app_scheme_cb, None)

        self._web_view = WebKit2.WebView()
        self._web_view.connect("load-changed", self._loading_changed_cb)

        self.set_canvas(self._web_view)
        self._web_view.show()

        settings = self._web_view.get_settings()
        settings.set_property("enable-developer-extras", True)

        self._authenticated = False

        self._server = Server()
        self._server.connect("session-started", self._session_started_cb)
        self._port = self._server.start()
        self._key = os.urandom(16).encode("hex")

        index_path = os.path.join(activity.get_bundle_path(), "index.html")
        self._web_view.load_uri("activity://%s/%s" %
                                (self.get_bundle_id(), index_path))

        self._apis = {}
        self._apis["activity"] = ActivityAPI(self)

    def _loading_changed_cb(self, web_view, load_event):
        if load_event == WebKit2.LoadEvent.FINISHED:
            script = "window.sugarKey = '%s'; " \
                     "window.sugarPort = %d; " \
                     "if (window.onSugarKeySet) " \
                     "window.onSugarKeySet();" % (self._key, self._port)

            self._web_view.run_javascript(script, None, None, None)

    def _key_press_event_cb(self, window, event):
        key_name = Gdk.keyval_name(event.keyval)

        if event.get_state() & Gdk.ModifierType.CONTROL_MASK and \
           event.get_state() & Gdk.ModifierType.SHIFT_MASK:
            if key_name == "I":
                inspector = self._web_view.get_inspector()
                if inspector.is_attached():
                    inspector.close()
                else:
                    inspector.show()

    def _app_scheme_cb(self, request, user_data):
        path = os.path.join(activity.get_bundle_path(), request.get_path())

        request.finish(Gio.File.new_for_path(path).read(None),
                       -1, Gio.content_type_guess(path, None)[0])

    def _session_started_cb(self, server, session):
        session.connect("message-received", self._message_received_cb)

    def _message_received_cb(self, session, message):
        request = json.loads(message.data)

        if request["method"] == "authenticate":
            if self._key == request["params"][0]:
                self._authenticated = True
                return

        if not self._authenticated:
            return

        api_name, method_name = request["method"].split(".")
        method = getattr(self._apis[api_name], method_name)

        result = method(*request["params"])

        response = {"result": result,
                    "error": None,
                    "id": request["id"]}

        session.send_message(json.dumps(response))