import time
import queue
import _thread
import urllib.request, urllib.parse, urllib.error

import gi
from gi.repository import Gdk
from gi.repository import Gtk
from gi.repository import GLib

try:
    gi.require_version('WebKit', '3.0')
    from gi.repository import WebKit
    have_webkit = True
except:
    have_webkit = False

class UseWebKit: pass



use = UseWebKit 

class WebKitMethods(object):

    @staticmethod
    def create_browser():
        return WebKit.WebView()

    @staticmethod
    def inject_javascript(browser, script):
        browser.execute_script(script)

    @staticmethod
    def connect_title_changed(browser, callback):
        def callback_wrapper(widget, frame, title): callback(title)
        browser.connect('title-changed', callback_wrapper)

    @staticmethod
    def open_uri(browser, html):
        browser.load_html_string(html, 'file:///usr/share/mageiawelcome/')


if use is UseWebKit:
    implementation = WebKitMethods


def asynchronous_gtk_message(fun):

    def worker(wargs):
        (function, args, kwargs) = wargs
        function(*args, **kwargs)

    def fun2(*args, **kwargs):
        GLib.idle_add(worker, (fun, args, kwargs))

    return fun2


def synchronous_gtk_message(fun):

    class NoResult: pass

    def worker(wargs):
        (R, function, args, kwargs) = wargs
        R.result = function(*args, **kwargs)

    def fun2(*args, **kwargs):
        class R: result = NoResult
        GLib.idle_add(worker, (R, fun, args, kwargs))
        while R.result is NoResult: time.sleep(0.01)
        return R.result

    return fun2

def launch_browser(html, quit_function=None, echo=True):

    window = Gtk.Window()
    browser = implementation.create_browser()
    settings = browser.get_settings()
    settings.set_property('enable-default-context-menu', False)

    box = Gtk.VBox(homogeneous=False, spacing=0)
    window.add(box)


    if quit_function is not None:
        window.connect('destroy', quit_function)

    box.pack_start(browser, expand=True, fill=True, padding=0)
    window.set_icon_name('preferences-desktop-personal')
    window.set_title(_('Welcome to Mageia!'))
    window.set_position(Gtk.WindowPosition.CENTER)
    window.set_default_size(800, 500)
    window.set_size_request(800, 500)
    window.set_resizable(False)
    window.show_all()

    message_queue = queue.Queue()

    def title_changed(title):
        if title != 'null': message_queue.put(title)

    implementation.connect_title_changed(browser, title_changed)

    implementation.open_uri(browser, html)

    def web_recv():
        if message_queue.empty():
            return None
        else:
            msg = message_queue.get()
            if echo: print('>>>', msg)
            return msg

    def web_send(msg):
        if echo: print('<<<', msg)
        asynchronous_gtk_message(implementation.inject_javascript)(browser, msg)

    return browser, web_recv, web_send


def start_gtk_thread():
    # Start GTK in its own thread:
    Gdk.threads_init()
    Gdk.threads_enter()
    _thread.start_new_thread(Gtk.main, ())

def kill_gtk_thread():
    asynchronous_gtk_message(Gtk.main_quit)()