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

# Mitter, a micro-blogging client with multiple interfaces.
# Copyright (C) 2007-2010  Mitter Contributors
#
# 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 gobject
import gtk
import pango

import logging
import re
import gettext
import webbrowser

from cgi import escape as html_escape

import timesince

# ----------------------------------------------------------------------
# Constants for the message
# ----------------------------------------------------------------------
MESSAGE_FORMAT = ('%(favorite_star)s'
        '<b>%(full_name)s</b> '
        '<small>(%(username)s'
        '%(message_type)s'
        ')</small>:'
        '%(read_status)s '
        '%(protected_status)s '
        '\n'
        '%(message)s\n'
        '<small>%(message_age)s</small>')
URL_RE = re.compile(r'(https?://[^\s\n\r]+)', re.I)

# ----------------------------------------------------------------------
# Logging
# ----------------------------------------------------------------------
_log = logging.getLogger('ui.pygtk.messagegrid')

# ----------------------------------------------------------------------
# I18n bits
# ----------------------------------------------------------------------
t = gettext.translation('ui_pygtk', fallback=True)
_ = t.gettext
N_ = t.ngettext

# ----------------------------------------------------------------------
# MessageGrid class
# ----------------------------------------------------------------------

class MessageGrid(gtk.ScrolledWindow, gobject.GObject):
    """Custom message grid."""

    __gsignals__ = {
            "count-changed": (  # the number of unread messages changed
                gobject.SIGNAL_RUN_LAST,
                gobject.TYPE_NONE,
                (gobject.TYPE_INT, )),
            'message-changed': (    # the selected message changed
                gobject.SIGNAL_RUN_LAST,
                gobject.TYPE_NONE,
                (gobject.TYPE_PYOBJECT, ))}

    @property
    def count(self):
        """Number of unread messages."""
        return self._message_count

    @count.setter
    def count(self, messages):
        """Update the number of unread messages."""
        self._message_count = messages
        self.emit('count-changed', messages)
        return

    @property
    def selected(self):
        """Return the selected message or None if there is no selected
        message."""
        (model, iter) = self._grid.get_selection().get_selected()
        if not iter:
            return None

        data = model.get_value(iter, 0)

        # just so we can track this message again
        data.grid = self
        data.iter = iter

        return data

    def __init__(self, avatar_cache):
        super(MessageGrid, self).__init__()

        self.avatars = avatar_cache
        self.link_color = '#0000ff'
        self.unread_char = '(o)'
        self.favorite_char = '(F)'
        self.unfavorite_char = '( )'
        self.protected_char = '(protected)'

        self._message_count = 0

        store = gtk.ListStore(object)
        store.set_sort_column_id(0, gtk.SORT_ASCENDING)
        store.set_sort_func(0, self._order_datetime)

        self._grid = gtk.TreeView(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_fixed_width(54) # avatar size (we resize to 48x48)
        # TODO: Check the border size for this. "54" is guesswork.
        user_column.set_sizing(gtk.TREE_VIEW_COLUMN_FIXED)
        user_column.set_cell_data_func(user_renderer,
                self._cell_renderer_user)

        message_renderer = gtk.CellRendererText()
        message_renderer.set_property('wrap-mode', pango.WRAP_WORD)
        message_renderer.set_property('wrap-width', 200)
        message_column = gtk.TreeViewColumn('Message',
                message_renderer)
        message_column.set_cell_data_func(message_renderer,
                self._cell_renderer_message)

        self._grid.append_column(user_column)
        self._grid.append_column(message_column)

        self._grid.set_resize_mode(gtk.RESIZE_IMMEDIATE)
        self._grid.connect('cursor-changed', self._message_selected)
        self._grid.connect('button-press-event', self._click_message)
        self._grid.connect('popup-menu', self._message_popup)   # Menu button

        self.set_policy(gtk.POLICY_NEVER, gtk.POLICY_ALWAYS)
        self.add(self._grid)
        return

    #-----------------------------------------------------------------------
    # Renderers
    #-----------------------------------------------------------------------
    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.author.avatar
        cell.set_property('pixbuf', self.avatars.get(self, 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)
        time = timesince.timesince(data.message_time)

        message_values = {}

        # unescape escaped entities that pango is not okay with
        message_values['message'] = html_escape(data.message)
        message_values['username'] = html_escape(data.author.username)
        message_values['full_name'] = html_escape(data.author.name)
        message_values['message_age'] = time

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

        # use a different highlight for the current user
        # TODO: How to handle this with several networks?
        #message = re.sub(r'(@'+self.twitter.username+')',
        #        r'<span foreground="#FF6633">\1</span>',
        #        message)

        if not data.read:
            message_values['read_status'] = (' ' + self.unread_char)
        else:
            message_values['read_status'] = ''

        if data.favorite:
            message_values['favorite_star'] = (self.unfavorite_char)
        else:
            message_values['favorite_star'] = (self.favorite_char)

        info = []
        if data.reposted_by:
            info.append(_(' &#8212; <i>reposted by %s</i>') %
                    (data.reposted_by.username))

        if data.parent_owner:
            info.append(_(' &#8212; <i>in reply to %s</i>') %
                    (data.parent_owner.username))

        if data.protected:
            message_values['protected_status'] = (self.protected_char)
        else:
            message_values['protected_status'] = ''

        message_values['message_type'] = ''.join(info)
        markup = MESSAGE_FORMAT % (message_values)

        # This log is massive, but it can help when the grid doesn't show any
        # messages (usually when there is something broken with the markup.)
        #_log.debug('Markup:\n%s' % (markup))

        cell.set_property('markup', markup)

        return

    #-----------------------------------------------------------------------
    # Widget callbacks
    #-----------------------------------------------------------------------
    def _message_selected(self, view, user_data=None):
        """Callback when a row in the list is selected."""
        message = self.selected
        if not message:
            return 0

        if not message.read:
            self.count -= 1

        message.read = True
        self.emit('message-changed', message)
        return 0

    def _click_message(self, widget, event, user_data=None):
        """Check the click on the message and, if it's a right click, call the
        _message_popup function to show the popup."""
        if event.button != 3:
            # not right click
            return False

        path = widget.get_path_at_pos(int(event.x), int(event.y))
        if not path:
            return False

        (path, _, _, _) = path
        return self._url_popup(widget, path, event)

    def _message_popup(self, widget, user_data=None):
        """Builds the popup with the URLs in the message."""
        (path, _) = widget.get_cursor()
        if not path:
            return True

        # create a syntetic event (the popup requires one)
        event = gtk.gdk.Event(gtk.gdk.BUTTON_PRESS)
        event.button = 3
        return self._url_popup(widget, path, event)

    def _url_popup(self, widget, path, event):
        """Builds the popup with URLs in the cell pointed by *path*. Requires
        the *event* that the widget received."""
        iter = widget.get_model().get_iter(path)
        message = widget.get_model().get_value(iter, 0)

        items = []
        if message.link:
            items.append((_('Open on %s') % (message.network_name),
                    message.link))

        urls = URL_RE.findall(message.message)
        for url in urls:
            if len(url) > 20:
                title = url[:20] + '...'
            else:
                title = url
            items.append((title, url))

        if len(items) == 0:
            return

        popup = gtk.Menu()
        for url in items:
            (title, url) = url
            item = gtk.MenuItem(title)
            item.connect('activate', self._open_url, url)
            popup.append(item)

        popup.show_all()
        popup.popup(None, None, None, event.button, event.time)

        return True

    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

    def _open_url(self, widget, user_data=None):
        """Opens an URL (used mostly from popup menu items.)"""
        webbrowser.open_new_tab(user_data)
        return

    def update_window_size(self, size):
        """Called when the window size changes, so the grid needs to change
        its word-wrapping size."""
        model = self._grid.get_model()
        if len(model) == 0:
            return

        column = self._grid.get_column(1)   # 0=avatar, 1=message
        iter = model.get_iter_first()
        path = model.get_path(iter)

        width = size - 85  # 48 = icon size
        # TODO: Find out where those 37 pixels came from and/or if they
        # are platform specific.

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

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

    #-----------------------------------------------------------------------
    # Class methods
    #-----------------------------------------------------------------------
    @staticmethod
    def delete(self, message):
        """Removes a message from the grid."""
        if not hasattr(message, 'grid'):
            _log.debug('No grid information in the message')
            return

        grid = message.grid
        grid.remove(message)
        return

    #-----------------------------------------------------------------------
    # Public functions
    #-----------------------------------------------------------------------
    def update(self, messages):
        """Update the grid with new messages."""
        self._grid.freeze_notify()
        store = self._grid.get_model()
        for message in messages:
            message.read = False
            store.prepend([message])
        store.sort_column_changed()
        self._grid.thaw_notify()
        self._grid.queue_draw()

        self.count += len(messages)
        return

    def clear_posts(self):
        """Clear the list of posts from the grid."""
        self._grid.get_model().clear()
        self.count = 0
        return

    def mark_all_read(self):
        """Mark all messages as read."""
        model = self._grid.get_model()
        if len(model) == 0:
            # no messages, so we don't worry (if I recall correctly,
            # get_iter_first will fail if the model is empty)
            return

        iter = model.get_iter_first()
        while iter:
            message = model.get_value(iter, 0)
            message.read = True
            iter = model.iter_next(iter)

        self.count = 0
        return

    def queue_draw(self):
        """Make the grid to be redraw when possible."""
        # we need this 'cause _grid is not exposed.
        self._grid.queue_draw()
        return

    def remove(self, message):
        """Remove a message from the list"""
        if not hasattr(message, 'iter'):
            _log.debug('No iterator information in the message')
            return

        iter = message.iter
        self._grid.get_model().remove(iter)
        return