# Copyright (C) 2006, Red Hat, Inc.
# Copyright (C) 2007, One Laptop Per Child
#
# 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 2 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, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

import os
import logging
from gettext import gettext as _

import gtk
import xpcom
from xpcom.components import interfaces

from sugar.graphics.toolbutton import ToolButton
from sugar.graphics import AddressEntry

import sessionhistory
import progresslistener

class WebToolbar(gtk.Toolbar):
    def __init__(self, browser):
        gtk.Toolbar.__init__(self)

        self._browser = browser

        self._back = ToolButton('go-previous')
        self._back.set_tooltip(_('Back'))
        self._back.props.sensitive = False
        self._back.connect('clicked', self._go_back_cb)
        self.insert(self._back, -1)
        self._back.show()

        self._forward = ToolButton('go-next')
        self._forward.set_tooltip(_('Forward'))
        self._forward.props.sensitive = False
        self._forward.connect('clicked', self._go_forward_cb)
        self.insert(self._forward, -1)
        self._forward.show()

        self._stop_and_reload = ToolButton('stop')
        self._stop_and_reload.connect('clicked', self._stop_and_reload_cb)
        self.insert(self._stop_and_reload, -1)
        self._stop_and_reload.show()

        self._entry = AddressEntry()
        self._entry.connect('activate', self._entry_activate_cb)

        entry_item = gtk.ToolItem()
        entry_item.set_expand(True)
        entry_item.add(self._entry)
        self._entry.show()
        
        self.insert(entry_item, -1)
        entry_item.show()

        progress_listener = progresslistener.get_instance()
        progress_listener.connect('location-changed', self._location_changed_cb)
        progress_listener.connect('loading-start', self._loading_start_cb)
        progress_listener.connect('loading-stop', self._loading_stop_cb)
        progress_listener.connect('loading-progress', self._loading_progress_cb)

        session_history = sessionhistory.get_instance()
        #session_history.connect('location-changed', self._location_changed_cb)

        self._browser.connect("notify::title", self._title_changed_cb)

    def _location_changed_cb(self, progress_listener, uri):
        self._set_address(uri)
        self._update_navigation_buttons()

    def _loading_start_cb(self, progress_listener):
        self._set_title(None)
        self._set_loading(True)
        self._update_navigation_buttons()

    def _loading_stop_cb(self, progress_listener):
        self._set_loading(False)
        self._update_navigation_buttons()

    def _loading_progress_cb(self, progress_listener, progress):
        self._set_progress(progress)

    def _set_progress(self, progress):
        self._entry.props.progress = progress

    def _set_address(self, address):
        self._entry.props.address = address

    def _set_title(self, title):
        self._entry.props.title = title

    def _show_stop_icon(self):
        self._stop_and_reload.set_icon('stop')

    def _show_reload_icon(self):
        self._stop_and_reload.set_icon('view-refresh')

    def _update_navigation_buttons(self):
        can_go_back = self._browser.web_navigation.canGoBack
        self._back.props.sensitive = can_go_back

        can_go_forward = self._browser.web_navigation.canGoForward
        self._forward.props.sensitive = can_go_forward

    def _entry_activate_cb(self, entry):
        self._browser.load_uri(entry.props.text)
        self._browser.grab_focus()

    def _go_back_cb(self, button):
        self._browser.web_navigation.goBack()
    
    def _go_forward_cb(self, button):
        self._browser.web_navigation.goForward()

    def _title_changed_cb(self, embed, spec):
        self._set_title(embed.props.title)

    def _stop_and_reload_cb(self, button):
        if self._loading:
            self._browser.web_navigation.stop(interfaces.nsIWebNavigation.STOP_ALL)
        else:
            flags = interfaces.nsIWebNavigation.LOAD_FLAGS_NONE
            self._browser.web_navigation.reload(flags)

    def _set_loading(self, loading):
        self._loading = loading

        if self._loading:
            self._show_stop_icon()
            self._stop_and_reload.set_tooltip(_('Stop'))
        else:
            self._show_reload_icon()
            self._stop_and_reload.set_tooltip(_('Reload'))