#!/usr/bin/python
# -*- coding: utf-8 -*-

# Mitter, a Maemo client for Twitter.
# Copyright (C) 2007, 2008  Julio Biason, Deepak Sarda
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import gtk
import gobject

gobject.threads_init()

import logging
import threading
import Queue
import re
import urllib2

from mitterlib.ui.helpers.image_helpers import find_image
from mitterlib import htmlize

from mitterlib.constants import gpl_3, version
#from mitterlib.ui.helpers.utils import str_len
#from mitterlib.ui.helpers.notify import Notify
from mitterlib.ui.helpers import timesince

# Constants

_log = logging.getLogger('ui.pygtk')

URL_RE = re.compile(r'(https?://[^\s\n\r]+)', re.I)


# ----------------------------------------------------------------------
# Helper Functions (not related to objects or that don't need direct access to
# the objects contents.)
# ----------------------------------------------------------------------

def _buffer_text(text_buffer):
    """Return the content of a gtk.TextBuffer."""
    start = text_buffer.get_start_iter()
    end = text_buffer.get_end_iter()

    text = text_buffer.get_text(start, end, include_hidden_chars=False)

    return text

# ----------------------------------------------------------------------
# Threading related objects.
# These classes are based on the code available at http://gist.github.com/51686
# (c) 2008, John Stowers <john.stowers@gmail.com>
# ----------------------------------------------------------------------

class _IdleObject(gobject.GObject):
    """
    Override gobject.GObject to always emit signals in the main thread
    by emmitting on an idle handler
    """
    def __init__(self):
        gobject.GObject.__init__(self)
 
    def emit(self, *args):
        gobject.idle_add(gobject.GObject.emit,self,*args)


class _WorkerThread(threading.Thread, _IdleObject):
    """
    A single working thread.
    """
    __gsignals__ = {
            "completed": (
                gobject.SIGNAL_RUN_LAST,
                gobject.TYPE_NONE,
                (gobject.TYPE_PYOBJECT,)),  # list/networkdata
            "exception": (
                gobject.SIGNAL_RUN_LAST,
                gobject.TYPE_NONE, 
                (gobject.TYPE_PYOBJECT,))   # The exception
            }
 
    def __init__(self, function, *args, **kwargs):
        threading.Thread.__init__(self)
        _IdleObject.__init__(self)
        self._function = function
        self._args = args
        self._kwargs = kwargs
 
    def run(self):
        # call the function
        _log.debug('Thread %s calling %s', self.ident, str(self._function))

        args = self._args
        kwargs = self._kwargs

        try:
            result = self._function(*args, **kwargs)
        except Exception, exc:  # Catch ALL exceptions
            # TODO: Check if this catch all warnins too!
            _log.debug('Exception %s', str(exc))
            self.emit("exception", exc)
            return

        _log.debug('Thread %s completed', self.name)

        self.emit("completed", result)
        return


class _ThreadManager(object):
    """Manages the threads."""

    def __init__(self, max_threads=2):
        """Start the thread pool. The number of threads in the pool is defined
        by `pool_size`, defaults to 2."""
        self._max_threads = max_threads
        self._thread_pool = []
        self._running = []
        self._thread_id = 0

        return

    def _remove_thread(self, widget, arg=None):
        """Called when the thread completes. We remove it from the thread list
        (dictionary, actually) and start the next thread (if there is one)."""

        # not actually a widget. It's the object that emitted the signal, in
        # this case, the _WorkerThread object.
        thread_id = widget.name 
        
        _log.debug('Thread %s completed, %d threads in the queue', thread_id,
                len(self._thread_pool))

        self._running.remove(thread_id)

        if self._thread_pool:
            if len(self._running) < self._max_threads:
                next = self._thread_pool.pop()
                _log.debug('Dequeuing thread %s', next.name)
                self._running.append(next.name)
                next.start()

        return

    def add_work(self, complete_cb, exception_cb, func, *args, **kwargs):
        """Add a work to the thread list. `complete_cb` is the function to be
        called with the result of the work. `exception_cb` is the function to
        be called if there are any exceptions raised. Note that, once the
        work is complete, one of those will be called, not both. `func` is the
        function to be called in the secondary threads. `args` and `kwargs`
        are parameters passed to the function."""

        thread = _WorkerThread(func, *args, **kwargs)
        thread_id = '%s' % (self._thread_id)

        thread.connect('completed', complete_cb)
        thread.connect('completed', self._remove_thread)
        thread.connect('exception', exception_cb)
        thread.setName(thread_id)

        if len(self._running) < self._max_threads:
            # immediatelly start the thread
            self._running.append(thread_id)
            thread.start()
        else:
            # add the thread to the queue
            running_names = ', '.join(self._running)
            _log.debug('Threads %s running, adding %s to the queue',
                    running_names, thread_id)
            self._thread_pool.append(thread)

        self._thread_id += 1
        return

# ----------------------------------------------------------------------
# Mitter interface object
# ----------------------------------------------------------------------

class Interface(object):
    """Linux/GTK interface for Mitter."""

    NAMESPACE = 'pygtk'

    # ------------------------------------------------------------
    # Widget creation functions
    # ------------------------------------------------------------
    def _systray_setup(self):
        if not (self._app_icon and self._app_icon_alert):
            self._systray = None
            return

        self._systray = gtk.StatusIcon()
        self._systray.set_from_file(self._app_icon)
        self._systray.connect('activate', self.systray_cb)
        self._systray.set_tooltip('Mitter: Click to toggle window visibility.')
        self._systray.set_visible(True)
        return

    def _create_main_window(self):
        """Returns the object with the main window and the attached
        widgets."""
        main_window = gtk.Window(gtk.WINDOW_TOPLEVEL)

        initial_width = int(self._options[self.NAMESPACE]['width'])
        initial_height = int(self._options[self.NAMESPACE]['height'])
        _log.debug('Initial size: %d x %d', initial_width, initial_height)

        initial_x = int(self._options[self.NAMESPACE]['position_x'])
        initial_y = int(self._options[self.NAMESPACE]['position_y'])
        _log.debug('Initial position: %d x %d', initial_x, initial_y)

        main_window.set_title('Mitter')
        main_window.set_size_request(10, 10) # very small minimal size
        main_window.resize(initial_width, initial_height)
        main_window.move(initial_x, initial_y)

        if self._app_icon:
            main_window.set_icon_from_file(self._app_icon)

        main_window.connect('destroy', self._quit_app)
        main_window.connect('delete-event', self._quit_app)
        main_window.connect('size-request', self._window_resize)

        grid = self._create_grid()
        (menu, toolbar, accelerators) = self._create_menu_and_toolbar()
        update_field = self._create_update_box()
        statusbar = self._create_statusbar()

        update_box = gtk.VPaned()
        update_box.pack1(grid, resize=True, shrink=False)
        update_box.pack2(update_field, resize=False, shrink=True)

        box = gtk.VBox(False, 1)
        box.pack_start(menu, False, True, 0)
        box.pack_start(update_box, True, True, 0)
        box.pack_start(statusbar, False, False, 0)
        main_window.add(box)
        main_window.add_accel_group(accelerators)

        return main_window

    def _create_grid(self):
        """Add the displaying grid."""
        # Store NetworkData objects only
        grid_store = gtk.ListStore(object)
        grid_store.set_sort_column_id(0, gtk.SORT_ASCENDING)
        grid_store.set_sort_func(0, self._order_datetime)

        self._grid = gtk.TreeView(grid_store)
        self._grid.set_property('headers-visible', False)
        self._grid.set_rules_hint(True)  # change color for each row

        user_renderer = gtk.CellRendererPixbuf()
        user_column = gtk.TreeViewColumn('User', user_renderer)
        user_column.set_cell_data_func(user_renderer,
                self._cell_renderer_user)
        self._grid.append_column(user_column)

        message_renderer = gtk.CellRendererText()
        message_renderer.set_property('wrap-mode', gtk.WRAP_WORD)
        message_renderer.set_property('wrap-width', 200)
        message_renderer.set_property('width', 10)

        message_column = gtk.TreeViewColumn('Message',
                message_renderer)
        message_column.set_cell_data_func(message_renderer,
                self._cell_renderer_message)
        self._grid.append_column(message_column)

        self._grid.set_resize_mode(gtk.RESIZE_IMMEDIATE)
        #self.grid.connect('cursor-changed', self.check_post)
        #self.grid.connect('row-activated', self.open_post)
        #self.grid.connect('button-press-event', self.click_post)
        #self.grid.connect('popup-menu',
        #        lambda view: self.show_post_popup(view, None))

        scrolled_window = gtk.ScrolledWindow()
        scrolled_window.set_policy(gtk.POLICY_NEVER, gtk.POLICY_ALWAYS)
        scrolled_window.add(self._grid)

        return scrolled_window

    def _create_menu_and_toolbar(self):
        """Create the main menu and the toolbar."""

        # tasks (used by the menu and toolbar)

        refresh_action = gtk.Action('Refresh', '_Refresh',
                'Update the listing', gtk.STOCK_REFRESH)
        #refresh_action.connect('activate', self.refresh)

        quit_action = gtk.Action('Quit', '_Quit',
                'Exit Mitter', gtk.STOCK_QUIT)
        quit_action.connect('activate', self._quit_app)

        settings_action = gtk.Action('Settings', '_Settings',
                'Settings', gtk.STOCK_PREFERENCES)
        #settings_action.connect('activate', self.show_settings)

        self._update_action = gtk.Action('Update', '_Update', 
                'Update your status', gtk.STOCK_ADD)
        self._update_action.set_property('sensitive', False)
        self._update_action.connect('activate', self._update_status)

        delete_action = gtk.Action('Delete', '_Delete', 'Delete a post',
                gtk.STOCK_DELETE)
        delete_action.set_property('sensitive', False)
        #delete_action.connect('activate', self.delete_tweet)

        about_action = gtk.Action('About', '_About', 'About Mitter',
                gtk.STOCK_ABOUT)
        about_action.connect('activate', self._show_about)

        #shrink_url_action = gtk.Action('ShrinkURL', 'Shrink _URL',
        #        'Shrink selected URL', gtk.STOCK_EXECUTE)
        #shrink_url_action.connect('activate', self.shrink_url)

        #mute_action = gtk.ToggleAction('MuteNotify', '_Mute Notifications',
        #        'Mutes notifications on new tweets', gtk.STOCK_MEDIA_PAUSE)
        #mute_action.set_active(False)

        post_action = gtk.Action('Posts', '_Posts', 'Post management', None)

        file_action = gtk.Action('File', '_File', 'File', None)
        edit_action = gtk.Action('Edit', '_Edit', 'Edit', None)
        help_action = gtk.Action('Help', '_Help', 'Help', None)

        # action group (will have all the actions, 'cause we are not actually
        # grouping them, but Gtk requires them that way)

        self.action_group = gtk.ActionGroup('MainMenu')
        self.action_group.add_action_with_accel(refresh_action, 'F5')
        # None = use the default accelerator, based on the STOCK used.
        self.action_group.add_action_with_accel(quit_action, None)
        self.action_group.add_action(settings_action)
        self.action_group.add_action(delete_action)
        self.action_group.add_action(post_action)
        self.action_group.add_action(file_action)
        self.action_group.add_action(edit_action)
        self.action_group.add_action(help_action)
        self.action_group.add_action(about_action)
        #self.action_group.add_action_with_accel(shrink_url_action, '<Ctrl>u')
        #self.action_group.add_action_with_accel(mute_action, '<Ctrl>m')
        self.action_group.add_action_with_accel(self._update_action,
                '<Ctrl>Return')

        # definition of the UI

        uimanager = gtk.UIManager()
        uimanager.insert_action_group(self.action_group, 0)
        ui = '''
        <ui>
          <toolbar name="MainToolbar">
            <toolitem action="Refresh" />
            <separator />
            <toolitem action="Delete" />
            <separator />
            <toolitem action="Settings" />
            <toolitem action="Quit" />
          </toolbar>
          <menubar name="MainMenu">
            <menu action="File">
              <menuitem action="Quit" />
            </menu>
            <menu action="Edit">
              <menuitem action="Refresh" />
              <menuitem action="Update" />
              <menuitem action="Delete" />
              <menuitem action="ShrinkURL" />
              <menuitem action="MuteNotify" />
              <separator />
              <menuitem action="Settings" />
            </menu>
            <menu action="Help">
              <menuitem action="About" />
            </menu>
          </menubar>
        </ui>
        '''
        uimanager.add_ui_from_string(ui)

        main_menu = uimanager.get_widget('/MainMenu')
        main_toolbar = uimanager.get_widget('/MainToolbar')

        return (main_menu, main_toolbar, uimanager.get_accel_group())

    def _create_update_box(self):
        """Create the widgets related to the update box"""
        self._update_text = gtk.TextView()
        text_buffer = self._update_text.get_buffer()
        text_buffer.connect('changed', self._count_chars)

        self._update_button = gtk.Button(stock=gtk.STOCK_ADD)
        self._update_button.connect('clicked', self._update_status)
        self._update_button.set_property('sensitive', False)

        update_box = gtk.HBox(False, 0)
        update_box.pack_start(self._update_text, expand=True, fill=True,
                padding=0)
        update_box.pack_start(self._update_button, expand=False, fill=False,
                padding=0)

        info_box = gtk.HBox(False, 0)
        self._char_count = gtk.Label()
        self._char_count.set_text('(140)')
        info_box.pack_start(gtk.Label('What are you doing?'))
        info_box.pack_start(self._char_count)

        update_area = gtk.VBox(True, 0)
        update_area.pack_start(info_box)
        update_area.pack_start(update_box)

        return update_area

    def _create_statusbar(self):
        """Create the statusbar."""
        statusbar = gtk.Statusbar()
        # TODO: Probaly set the context in the object.
        return statusbar

    def _show_about(self, widget):
        """Show the about dialog."""

        about_window = gtk.AboutDialog()
        about_window.set_name('Mitter')
        about_window.set_version(version)
        about_window.set_copyright('2007-2009 Mitter Contributors')
        about_window.set_license(gpl_3)
        about_window.set_website('http://code.google.com/p/mitter')
        about_window.set_website_label('Mitter on GoogleCode')
        about_window.set_authors([
            'Main developers:',
            'Julio Biason',
            'Deepak Sarda',
            'Gerald Kaszuba',
            ' ',
            'And patches from:',
            'Santiago Gala',
            'Sugree Phatanapherom',
            'Kristian Rietveld',
            '"Wiennat"',
            'Philip Reynolds',
            'Greg McIntyre',
            '"Alexander"'])
        if self._app_icon:
            _log.debug('Icon: %s', self._app_icon)
            about_window.set_logo(gtk.gdk.pixbuf_new_from_file(
                self._app_icon))
        about_window.run()
        about_window.hide()

    # ------------------------------------------------------------
    # Cell rendering functions
    # ------------------------------------------------------------
    def _cell_renderer_user(self, column, cell, store, position):
        """Callback for the user column. Used to created the pixbuf of the
        userpic."""

        data = store.get_value(position, 0)
        pic = data.avatar
        if not pic in self._avatars:
            self._threads.add_work(self._post_download_pic,
                    self._exception_download_pic,
                    self._download_pic,
                    pic)

            # set the user avatar to the default image, so it won't get queued
            # again. Once downloaded, the _post_download_pic will update the
            # image and force a redraw.
            self._avatars[pic] = self._default_pixmap

        cell.set_property('pixbuf', self._avatars[pic])

        return

    def _cell_renderer_message(self, column, cell, store, position):
        """Callback for the message column. We need this to adjust the markup
        property of the cell, as setting it as text won't do any markup
        processing."""

        data = store.get_value(position, 0)

        message = data.message
        username = data.username

        #_log.debug('Rendering message: %s', message)

        time = timesince.timesince(data.message_time)

        # unescape escaped entities that pango is not okay with
        message = htmlize(message)
        

        # highlight URLs
        mask = r'<span foreground="%s">\1</span>' % (
                self._options[self.NAMESPACE]['link_colour'])
        message = URL_RE.sub(mask, message)


        # use a different highlight for the current user
        #message = re.sub(r'(@'+self.twitter.username+')',
        #        r'<span foreground="#FF6633">\1</span>',
        #        message)

        markup = '<b>%s</b> <small>(%s)</small>:\n%s\n<small>%s</small>' % \
                (data.name, username, message, time)
        cell.set_property('markup', markup)

        return

    # ------------------------------------------------------------
    # Helper functions
    # ------------------------------------------------------------
    def _update_sensitivity(self, enabled):
        """Set the "sensitive" property of the update action and button. Both
        should have the same property, so whenever you need to disable/enable
        them, use this function."""

        self._update_button.set_property('sensitive', enabled)
        self._update_action.set_property('sensitive', enabled)
        return

    # ------------------------------------------------------------
    # Widget callback functions
    # ------------------------------------------------------------

    def _count_chars(self, text_buffer):
        """Count the number of chars in the edit field and update the
        label that shows the available space."""
        text = _buffer_text(text_buffer)
        count = len(text)

        self._char_count.set_text('(%d)' % (140 - count))
        self._update_sensitivity(not (count == 0))
        return True

    def _update_status(self, widget):
        """Update your status."""
        _log.debug('Updating status.')
        status = _buffer_text(self._update_text.get_buffer())
        status = status.strip()
        if not status:
            return

        _log.debug('Status: %s', status)
        self._update_sensitivity(False)
        self._threads.add_work(self._post_update_status,
                self._exception_update_status,
                self._connection.update,
                status)
        # TODO: We are not dealing with replies here yet
        return

    def _quit_app(self, widget=None, user_data=None):
        """Callback when the window is destroyed or the user selects
        "Quit"."""

        (x, y) = self._main_window.get_position()
        _log.debug('Current position: %d x %d', x, y)
        self._options[self.NAMESPACE]['position_x'] = x
        self._options[self.NAMESPACE]['position_y'] = y

        (width, height) = self._main_window.get_size()
        _log.debug('Current window size: %d x %d', width, height)
        self._options[self.NAMESPACE]['width'] = width
        self._options[self.NAMESPACE]['height'] = height

        gtk.main_quit()
        return

    def _window_resize(self, widget, request, data=None):
        """Called when the window is resized. We use it to set the proper
        word-wrapping in the message column."""

        (width, height) = widget.get_size()
        model = self._grid.get_model()

        if len(model) == 0:
            # nothing in the list, so we don't have what to set proper word
            # wrapping
            return

        column = self._grid.get_column(1)
        iter = model.get_iter_first()
        path = model.get_path(iter)

        column_rectangle = self._grid.get_cell_area(path, column)

        for renderer in column.get_cell_renderers():
            renderer.set_property('wrap-width', column_rectangle.width)

        while iter:
            path = model.get_path(iter)
            model.row_changed(path, iter)
            iter = model.iter_next(iter)

        return

    def _order_datetime(self, model, iter1, iter2, user_data=None):
        """Used by the ListStore to sort the columns (in our case, "column")
        by date."""
        message1 = model.get_value(iter1, 0)
        message2 = model.get_value(iter2, 0)

        if (not message1) or \
                (not message1.message_time) or \
                (message1.message_time > message2.message_time):
            return -1

        if (not message2) or \
                (not message2.message_time) or \
                (message2.message_time > message1.message_time):
            return 1
        return 0

    # ------------------------------------------------------------
    # Network related functions
    # ------------------------------------------------------------

    ### Results from the "messages" request
    def _post_get_messages(self, widget, results):
        """Function called after the data from the messages list is
        retrieved."""
        _log.debug('%d new tweets', len(results))
        store = self._grid.get_model()
        for message in results:
            _log.debug('Data: %s', str(message))
            store.prepend([message])
        store.sort_column_changed()
        self._grid.queue_draw()
        return

    def _exception_get_messages(self, widget, exception):
        """Function called if the retrival of current messages returns an
        exception."""
        _log.debug(str(exception))
        return

    ### image download function
    def _download_pic(self, url):
        """Download a picture from the web. Can be used in a thread."""
        request = urllib2.Request(url=url)
        _log.debug('Starting request of %s' % (url))
        response = urllib2.urlopen(request)
        data = response.read()
        _log.debug('Request completed')

        return (url, data)

    ### Results from the picture request
    def _post_download_pic(self, widget, data):
        """Called after the data from the picture is available."""

        (url, data) = data

        loader = gtk.gdk.PixbufLoader()
        loader.write(data)
        loader.close()

        user_pic = loader.get_pixbuf()
        user_pic = user_pic.scale_simple(48, 48, gtk.gdk.INTERP_BILINEAR)
        self._avatars[url] = user_pic

        self._grid.queue_draw()
        return

    def _exception_download_pic(self, widget, exception):
        """Called in case we have a problem downloading an user avatar."""
        _log.debug('Exception trying to get an avatar.')
        _log.debug(str(exception))
        return

    ### Results for the update status call
    def _post_update_status(self, widget, data):
        """Called when the status is updated correctly."""
        self._update_sensitivity(True)
        self._update_text.get_buffer().set_text('')
        return

    def _exception_update_status(self, widget, exception):
        """Called when there is an exception updating the status."""
        # TODO: Need the check the type of exception we got.
        _log.debug('Update error')
        _log.debug(str(exception))
        return

    # ------------------------------------------------------------
    # Required functions for all interfaces
    # ------------------------------------------------------------

    def __init__(self, connection, options):
        """Start the interface. `connection` is the :class:`Networks` object
        with all the available networks. `options` is the :class:`ConfigOpt`
        object with the configuration to run Mitter."""

        self._connection = connection
        self._options = options

        self._avatars = {}
        self._pic_queue = set()

        # Load images
        self._app_icon = find_image('mitter.png')
        self._app_icon_alert = find_image('mitter-new.png')

        unknown_pixbuf = find_image('unknown.png')
        if unknown_pixbuf:
            self._default_pixmap = gtk.gdk.pixbuf_new_from_file(
                    unknown_pixbuf)
        else:
            self._default_pixmap = gtk.gdk.Pixbuf(gtk.gdk.COLORSPACE_RGB,
                    has_alpha=False, bits_per_sample=8, width=48, height=48)

        return

    def __call__(self):
        """Call function; displays the interface. This method should appear on
        every interface."""

        self._main_window = self._create_main_window()
        self._main_window.show_all()
        self._threads = _ThreadManager()

        # queue the first fetch
        self._threads.add_work(self._post_get_messages, 
                self._exception_get_messages,
                self._connection.messages)

        gtk.main()

    @classmethod
    def options(self, options):
        """Add the options for this interface."""
        options.add_group(self.NAMESPACE, 'GTK+ Interface')
        options.add_option('--refresh-interval',
                group=self.NAMESPACE,
                option='refresh_interval',
                help='Refresh interval',
                type='int',
                metavar='MINUTES',
                default=5,
                conflict_group='interface')
        # Most of the options for non-cmd-options are useless, but I'm keeping
        # them as documentation.
        options.add_option(
                group=self.NAMESPACE,
                option='width',
                help='Window width',
                type='int',
                metavar='PIXELS',
                default=450,
                conflict_group='interface',
                is_cmd_option=False)
        options.add_option(
                group=self.NAMESPACE,
                option='height',
                help='Window height',
                type='int',
                metavar='PIXELS',
                default=300,
                conflict_group='interface',
                is_cmd_option=False)
        options.add_option(
                group=self.NAMESPACE,
                option='position_x',
                help='Window position on the X axis',
                type='int',
                metavar='PIXELS',
                default=5,
                conflict_group='interface',
                is_cmd_option=False)
        options.add_option(
                group=self.NAMESPACE,
                option='position_y',
                help='Window position on the Y axis',
                type='int',
                metavar='PIXELS',
                default=5,
                conflict_group='interface',
                is_cmd_option=False)
        options.add_option(
                group=self.NAMESPACE,
                option='max_status_display',
                help='Maximum number of elements to keep internally',
                type='int',
                metavar='MESSAGES',
                default=60,
                conflict_group='interface',
                is_cmd_option=False)        # TODO: Should it be config only?
        options.add_option(
                group=self.NAMESPACE,
                option='link_colour',
                help='Color of links in the interface',
                type='str',
                metavar='COLOR',
                default='blue',
                conflict_group='interface',
                is_cmd_option=False)