# Copyright (C) 2003-2014 Yann Leboulanger <asterix AT lagaule.org>
# Copyright (C) 2005-2006 Dimitur Kirov <dkirov AT gmail.com>
# Copyright (C) 2005-2007 Nikos Kouremenos <kourem AT gmail.com>
# Copyright (C) 2006 Travis Shirk <travis AT pobox.com>
#
# This file is part of Gajim.
#
# Gajim 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; version 3 only.
#
# Gajim 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 Gajim. If not, see <http://www.gnu.org/licenses/>.

import os
import time
import logging
from functools import partial
from pathlib import Path
from enum import IntEnum, unique
from datetime import datetime

from gi.repository import Gtk
from gi.repository import Gdk
from gi.repository import GdkPixbuf
from gi.repository import GLib
from gi.repository import Pango
from nbxmpp.protocol import NS_JINGLE_FILE_TRANSFER_5

from gajim import gtkgui_helpers
from gajim import tooltips

from gajim.common import app
from gajim.common import helpers
from gajim.common.file_props import FilesProp
from gajim.common.protocol.bytestream import (is_transfer_active, is_transfer_paused,
        is_transfer_stopped)

from gajim.gtk.dialogs import HigDialog
from gajim.gtk.dialogs import InformationDialog
from gajim.gtk.dialogs import YesNoDialog
from gajim.gtk.dialogs import ErrorDialog
from gajim.gtk.dialogs import FTOverwriteConfirmationDialog
from gajim.gtk.dialogs import NonModalConfirmationDialog
from gajim.gtk.filechoosers import FileSaveDialog
from gajim.gtk.filechoosers import FileChooserDialog

log = logging.getLogger('gajim.filetransfer_window')

@unique
class Column(IntEnum):
    IMAGE = 0
    LABELS = 1
    FILE = 2
    TIME = 3
    PROGRESS = 4
    PERCENT = 5
    PULSE = 6
    SID = 7


class FileTransfersWindow:
    def __init__(self):
        self.files_props = {'r' : {}, 's': {}}
        self.height_diff = 0
        self.xml = gtkgui_helpers.get_gtk_builder('filetransfers.ui')
        self.window = self.xml.get_object('file_transfers_window')
        self.tree = self.xml.get_object('transfers_list')
        self.cancel_button = self.xml.get_object('cancel_button')
        self.pause_button = self.xml.get_object('pause_restore_button')
        self.cleanup_button = self.xml.get_object('cleanup_button')
        self.notify_ft_checkbox = self.xml.get_object(
                'notify_ft_complete_checkbox')

        shall_notify = app.config.get('notify_on_file_complete')
        self.notify_ft_checkbox.set_active(shall_notify)
        self.model = Gtk.ListStore(GdkPixbuf.Pixbuf, str, str, str, str, int,
            int, str)
        self.tree.set_model(self.model)
        col = Gtk.TreeViewColumn()

        render_pixbuf = Gtk.CellRendererPixbuf()

        col.pack_start(render_pixbuf, True)
        render_pixbuf.set_property('xpad', 3)
        render_pixbuf.set_property('ypad', 3)
        render_pixbuf.set_property('yalign', .0)
        col.add_attribute(render_pixbuf, 'pixbuf', 0)
        self.tree.append_column(col)

        col = Gtk.TreeViewColumn(_('File'))
        renderer = Gtk.CellRendererText()
        col.pack_start(renderer, False)
        col.add_attribute(renderer, 'markup', Column.LABELS)
        renderer.set_property('yalign', 0.)
        renderer = Gtk.CellRendererText()
        col.pack_start(renderer, True)
        col.add_attribute(renderer, 'markup', Column.FILE)
        renderer.set_property('xalign', 0.)
        renderer.set_property('yalign', 0.)
        renderer.set_property('ellipsize', Pango.EllipsizeMode.END)
        col.set_resizable(True)
        col.set_expand(True)
        self.tree.append_column(col)

        col = Gtk.TreeViewColumn(_('Time'))
        renderer = Gtk.CellRendererText()
        col.pack_start(renderer, False)
        col.add_attribute(renderer, 'markup', Column.TIME)
        renderer.set_property('yalign', 0.5)
        renderer.set_property('xalign', 0.5)
        renderer = Gtk.CellRendererText()
        renderer.set_property('ellipsize', Pango.EllipsizeMode.END)
        col.set_resizable(True)
        col.set_expand(False)
        self.tree.append_column(col)

        col = Gtk.TreeViewColumn(_('Progress'))
        renderer = Gtk.CellRendererProgress()
        renderer.set_property('yalign', 0.5)
        renderer.set_property('xalign', 0.5)
        col.pack_start(renderer, False)
        col.add_attribute(renderer, 'text', Column.PROGRESS)
        col.add_attribute(renderer, 'value', Column.PERCENT)
        col.add_attribute(renderer, 'pulse', Column.PULSE)
        col.set_resizable(True)
        col.set_expand(False)
        self.tree.append_column(col)

        self.images = {}
        self.icons = {
                'upload': 'go-up',
                'download': 'go-down',
                'stop': 'window-close',
                'waiting': 'view-refresh',
                'pause': 'media-playback-pause',
                'continue': 'media-playback-start',
                'ok': 'emblem-ok-symbolic',
                'computing': 'system-run',
                'hash_error': 'network-error-symbolic',
        }

        self.tree.get_selection().set_mode(Gtk.SelectionMode.SINGLE)
        self.tree.get_selection().connect('changed', self.selection_changed)

        # Tooltip
        self.tree.connect('query-tooltip', self._query_tooltip)
        self.tree.set_has_tooltip(True)
        self.tooltip = tooltips.FileTransfersTooltip()

        self.file_transfers_menu = self.xml.get_object('file_transfers_menu')
        self.open_folder_menuitem = self.xml.get_object('open_folder_menuitem')
        self.cancel_menuitem = self.xml.get_object('cancel_menuitem')
        self.pause_menuitem = self.xml.get_object('pause_menuitem')
        self.continue_menuitem = self.xml.get_object('continue_menuitem')
        self.remove_menuitem = self.xml.get_object('remove_menuitem')
        self.xml.connect_signals(self)

    def _query_tooltip(self, widget, x_pos, y_pos, keyboard_mode, tooltip):
        try:
            x_pos, y_pos = widget.convert_widget_to_bin_window_coords(
                x_pos, y_pos)
            row = widget.get_path_at_pos(x_pos, y_pos)[0]
        except TypeError:
            self.tooltip.clear_tooltip()
            return False
        if not row:
            self.tooltip.clear_tooltip()
            return False

        iter_ = None
        try:
            model = widget.get_model()
            iter_ = model.get_iter(row)
        except Exception:
            self.tooltip.clear_tooltip()
            return False

        sid = self.model[iter_][Column.SID]
        file_props = FilesProp.getFilePropByType(sid[0], sid[1:])

        value, widget = self.tooltip.get_tooltip(file_props, sid)
        tooltip.set_custom(widget)
        return value

    def find_transfer_by_jid(self, account, jid):
        """
        Find all transfers with peer 'jid' that belong to 'account'
        """
        active_transfers = [[], []] # ['senders', 'receivers']
        allfp = FilesProp.getAllFileProp()
        for file_props in allfp:
            if file_props.type_ == 's' and file_props.tt_account == account:
                # 'account' is the sender
                receiver_jid = file_props.receiver.split('/')[0]
                if jid == receiver_jid and not is_transfer_stopped(file_props):
                    active_transfers[0].append(file_props)
            elif file_props.type_ == 'r' and file_props.tt_account == account:
                # 'account' is the recipient
                sender_jid = file_props.sender.split('/')[0]
                if jid == sender_jid and not is_transfer_stopped(file_props):
                    active_transfers[1].append(file_props)
            else:
                raise Exception('file_props has no type')
        return active_transfers

    def show_completed(self, jid, file_props):
        """
        Show a dialog saying that file (file_props) has been transferred
        """
        def on_open(widget, file_props):
            dialog.destroy()
            if not file_props.file_name:
                return
            path = os.path.split(file_props.file_name)[0]
            if os.path.exists(path) and os.path.isdir(path):
                helpers.launch_file_manager(path)
            self.tree.get_selection().unselect_all()

        if file_props.type_ == 'r':
            # file path is used below in 'Save in'
            (file_path, file_name) = os.path.split(file_props.file_name)
        else:
            file_name = file_props.name
        sectext = '\t' + _('Filename: %s') % GLib.markup_escape_text(file_name)
        sectext += '\n\t' + _('Size: %s') % \
        helpers.convert_bytes(file_props.size)
        if file_props.type_ == 'r':
            jid = file_props.sender.split('/')[0]
            sender_name = app.contacts.get_first_contact_from_jid(
                    file_props.tt_account, jid).get_shown_name()
            sender = sender_name
        else:
            #You is a reply of who sent a file
            sender = _('You')
        sectext += '\n\t' + _('Sender: %s') % sender
        sectext += '\n\t' + _('Recipient: ')
        if file_props.type_ == 's':
            jid = file_props.receiver.split('/')[0]
            receiver_name = app.contacts.get_first_contact_from_jid(
                    file_props.tt_account, jid).get_shown_name()
            recipient = receiver_name
        else:
            #You is a reply of who received a file
            recipient = _('You')
        sectext += recipient
        if file_props.type_ == 'r':
            sectext += '\n\t' + _('Saved in: %s') % file_path
        dialog = HigDialog(app.interface.roster.window, Gtk.MessageType.INFO,
            Gtk.ButtonsType.NONE, _('File transfer completed'), sectext)
        if file_props.type_ == 'r':
            button = Gtk.Button.new_with_mnemonic(_('Open _Containing Folder'))
            button.connect('clicked', on_open, file_props)
            dialog.action_area.pack_start(button, True, True, 0)
        ok_button = dialog.add_button(Gtk.STOCK_OK, Gtk.ResponseType.OK)
        def on_ok(widget):
            dialog.destroy()
        ok_button.connect('clicked', on_ok)
        dialog.show_all()

    def show_request_error(self, file_props):
        """
        Show error dialog to the recipient saying that transfer has been canceled
        """
        InformationDialog(_('File transfer cancelled'), _('Connection with peer cannot be established.'))
        self.tree.get_selection().unselect_all()

    def show_send_error(self, file_props):
        """
        Show error dialog to the sender saying that transfer has been canceled
        """
        InformationDialog(_('File transfer cancelled'),
                _('Connection with peer cannot be established.'))
        self.tree.get_selection().unselect_all()

    def show_stopped(self, jid, file_props, error_msg=''):
        if file_props.type_ == 'r':
            file_name = os.path.basename(file_props.file_name)
        else:
            file_name = file_props.name
        sectext = '\t' + _('Filename: %s') % GLib.markup_escape_text(file_name)
        sectext += '\n\t' + _('Recipient: %s') % jid
        if error_msg:
            sectext += '\n\t' + _('Error message: %s') % error_msg
        ErrorDialog(_('File transfer stopped'), sectext)
        self.tree.get_selection().unselect_all()

    def show_hash_error(self, jid, file_props, account):

        def on_yes(dummy, fjid, file_props, account):
            # Delete old file
            os.remove(file_props.file_name)
            jid, resource = app.get_room_and_nick_from_fjid(fjid)
            if resource:
                contact = app.contacts.get_contact(account, jid, resource)
            else:
                contact = app.contacts.get_contact_with_highest_priority(
                    account, jid)
                fjid = contact.get_full_jid()
            # Request the file to the sender
            sid = helpers.get_random_string_16()
            new_file_props = FilesProp.getNewFileProp(account, sid)
            new_file_props.file_name = file_props.file_name
            new_file_props.name = file_props.name
            new_file_props.desc = file_props.desc
            new_file_props.size = file_props.size
            new_file_props.date = file_props.date
            new_file_props.hash_ = file_props.hash_
            new_file_props.type_ = 'r'
            tsid = app.connections[account].start_file_transfer(fjid,
                                                            new_file_props,
                                                                True)
            new_file_props.transport_sid = tsid
            self.add_transfer(account, contact, new_file_props)

        if file_props.type_ == 'r':
            file_name = os.path.basename(file_props.file_name)
        else:
            file_name = file_props.name
        YesNoDialog(('File transfer error'),
            _('The file %(file)s has been received, but it seems to have '
            'been damaged along the way.\nDo you want to download it again?') % \
            {'file': file_name}, on_response_yes=(on_yes, jid, file_props,
            account), type_=Gtk.MessageType.ERROR)

    def show_file_send_request(self, account, contact):
        send_callback = partial(self.send_file, account, contact)
        SendFileDialog(send_callback, self.window)

    def send_file(self, account, contact, file_path, file_desc=''):
        """
        Start the real transfer(upload) of the file
        """
        if gtkgui_helpers.file_is_locked(file_path):
            pritext = _('Gajim can not read this file')
            sextext = _('Another process is using this file.')
            ErrorDialog(pritext, sextext)
            return

        if isinstance(contact, str):
            if contact.find('/') == -1:
                return
            (jid, resource) = contact.split('/', 1)
            contact = app.contacts.create_contact(jid=jid, account=account,
                resource=resource)
        file_name = os.path.split(file_path)[1]
        file_props = self.get_send_file_props(account, contact,
                        file_path, file_name, file_desc)
        if file_props is None:
            return False
        if contact.supports(NS_JINGLE_FILE_TRANSFER_5):
            log.info('contact %s supports jingle file transfer',
                     contact.get_full_jid())
            app.connections[account].start_file_transfer(contact.get_full_jid(),
                                                           file_props)
            self.add_transfer(account, contact, file_props)
        else:
            log.info('contact does not support jingle file transfer')
            file_props.transport_sid = file_props.sid
            app.connections[account].send_file_request(file_props)
            self.add_transfer(account, contact, file_props)
        return True

    def _start_receive(self, file_path, account, contact, file_props):
        file_dir = os.path.dirname(file_path)
        if file_dir:
            app.config.set('last_save_dir', file_dir)
        file_props.file_name = file_path
        file_props.type_ = 'r'
        self.add_transfer(account, contact, file_props)
        app.connections[account].send_file_approval(file_props)

    def on_file_request_accepted(self, account, contact, file_props):
        def on_ok(account, contact, file_props, file_path):
            if os.path.exists(file_path):
                app.config.set('last_save_dir', os.path.dirname(file_path))
                # check if we have write permissions
                if not os.access(file_path, os.W_OK):
                    file_name = GLib.markup_escape_text(os.path.basename(
                        file_path))
                    ErrorDialog(
                        _('Cannot overwrite existing file "%s"' % file_name),
                        _('A file with this name already exists and you do not '
                          'have permission to overwrite it.'))
                    return
                stat = os.stat(file_path)
                dl_size = stat.st_size
                file_size = file_props.size
                dl_finished = dl_size >= file_size

                def on_response(response):
                    if response < 0:
                        return
                    if response == 100:
                        file_props.offset = dl_size
                    self._start_receive(file_path, account, contact, file_props)

                dialog = FTOverwriteConfirmationDialog(
                    _('This file already exists'), _('What do you want to do?'),
                    propose_resume=not dl_finished, on_response=on_response)
                dialog.set_destroy_with_parent(True)
                return

            dirname = os.path.dirname(file_path)
            if not os.access(dirname, os.W_OK) and os.name != 'nt':
                # read-only bit is used to mark special folder under
                # windows, not to mark that a folder is read-only.
                # See ticket #3587
                ErrorDialog(
                    _('Directory "%s" is not writable') % dirname,
                    _('You do not have permission to create files '
                      'in this directory.'))
                return
            self._start_receive(file_path, account, contact, file_props)

        con = app.connections[account]
        accept_cb = partial(on_ok, account, contact, file_props)
        cancel_cb = partial(con.send_file_rejection, file_props)
        FileSaveDialog(accept_cb,
                       cancel_cb,
                       path=app.config.get('last_save_dir'),
                       file_name=file_props.name)

    def show_file_request(self, account, contact, file_props):
        """
        Show dialog asking for comfirmation and store location of new file
        requested by a contact
        """
        if not file_props or not file_props.name:
            return
        sec_text = '\t' + _('File: %s') % GLib.markup_escape_text(
            file_props.name)
        if file_props.size:
            sec_text += '\n\t' + _('Size: %s') % \
                    helpers.convert_bytes(file_props.size)
        if file_props.mime_type:
            sec_text += '\n\t' + _('Type: %s') % file_props.mime_type
        if  file_props.desc:
            sec_text += '\n\t' + _('Description: %s') % file_props.desc
        prim_text = _('%s wants to send you a file:') % contact.jid
        dialog = None

        def on_response_ok(account, contact, file_props):
            self.on_file_request_accepted(account, contact, file_props)

        def on_response_cancel(account, file_props):
            app.connections[account].send_file_rejection(file_props)

        dialog = NonModalConfirmationDialog(prim_text, sec_text,
                on_response_ok=(on_response_ok, account, contact, file_props),
                on_response_cancel=(on_response_cancel, account, file_props))
        dialog.connect('delete-event', lambda widget, event:
            on_response_cancel(account, file_props))
        dialog.popup()

    def get_icon(self, ident):
        return self.images.setdefault(ident,
            gtkgui_helpers.get_icon_pixmap(self.icons[ident], 24))

    def set_status(self, file_props, status):
        """
        Change the status of a transfer to state 'status'
        """
        iter_ = self.get_iter_by_sid(file_props.type_, file_props.sid)
        if iter_ is None:
            return

        if status == 'stop':
            file_props.stopped = True
        elif status == 'ok':
            file_props.completed = True
            text = self._format_percent(100)
            received_size = int(file_props.received_len)
            full_size = file_props.size
            text += helpers.convert_bytes(received_size) + '/' + \
                helpers.convert_bytes(full_size)
            self.model.set(iter_, Column.PROGRESS, text)
            self.model.set(iter_, Column.PULSE, GLib.MAXINT32)
        elif status == 'computing':
            self.model.set(iter_, Column.PULSE, 1)
            text = _('Checking file…') + '\n'
            received_size = int(file_props.received_len)
            full_size = file_props.size
            text += helpers.convert_bytes(received_size) + '/' + \
                helpers.convert_bytes(full_size)
            self.model.set(iter_, Column.PROGRESS, text)
            def pulse():
                p = self.model.get(iter_, Column.PULSE)[0]
                if p == GLib.MAXINT32:
                    return False
                self.model.set(iter_, Column.PULSE, p + 1)
                return True
            GLib.timeout_add(100, pulse)
        elif status == 'hash_error':
            text = _('File error') + '\n'
            received_size = int(file_props.received_len)
            full_size = file_props.size
            text += helpers.convert_bytes(received_size) + '/' + \
                helpers.convert_bytes(full_size)
            self.model.set(iter_, Column.PROGRESS, text)
            self.model.set(iter_, Column.PULSE, GLib.MAXINT32)
        self.model.set(iter_, Column.IMAGE, self.get_icon(status))
        path = self.model.get_path(iter_)
        self.select_func(path)

    def _format_percent(self, percent):
        """
        Add extra spaces from both sides of the percent, so that progress string
        has always a fixed size
        """
        _str = '          '
        if percent != 100.:
            _str += ' '
        if percent < 10:
            _str += ' '
        _str += str(percent) + '%          \n'
        return _str

    def _format_time(self, _time):
        times = {'hours': 0, 'minutes': 0, 'seconds': 0}
        _time = int(_time)
        times['seconds'] = _time % 60
        if _time >= 60:
            _time /= 60
            times['minutes'] = _time % 60
            if _time >= 60:
                times['hours'] = _time / 60

        #Print remaining time in format 00:00:00
        #You can change the places of (hours), (minutes), (seconds) -
        #they are not translatable.
        return _('%(hours)02.d:%(minutes)02.d:%(seconds)02.d') % times

    def _get_eta_and_speed(self, full_size, transfered_size, file_props):
        if not file_props.transfered_size:
            return 0., 0.

        if len(file_props.transfered_size) == 1:
            speed = round(float(transfered_size) / file_props.elapsed_time)
        else:
            # first and last are (time, transfered_size)
            first = file_props.transfered_size[0]
            last = file_props.transfered_size[-1]
            transfered = last[1] - first[1]
            tim = last[0] - first[0]
            if tim == 0:
                return 0., 0.
            speed = round(float(transfered) / tim)
        if speed == 0.:
            return 0., 0.
        remaining_size = full_size - transfered_size
        eta = remaining_size / speed
        return eta, speed

    def _remove_transfer(self, iter_, sid, file_props):
        self.model.remove(iter_)
        if not file_props:
            return
        if file_props.tt_account:
            # file transfer is set
            account = file_props.tt_account
            if account in app.connections:
                # there is a connection to the account
                app.connections[account].remove_transfer(file_props)
            if file_props.type_ == 'r': # we receive a file
                other = file_props.sender
            else: # we send a file
                other = file_props.receiver
            if isinstance(other, str):
                jid = app.get_jid_without_resource(other)
            else: # It's a Contact instance
                jid = other.jid
            for ev_type in ('file-error', 'file-completed', 'file-request-error',
            'file-send-error', 'file-stopped'):
                for event in app.events.get_events(account, jid, [ev_type]):
                    if event.file_props.sid == file_props.sid:
                        app.events.remove_events(account, jid, event)
                        app.interface.roster.draw_contact(jid, account)
                        app.interface.roster.show_title()
        FilesProp.deleteFileProp(file_props)
        del file_props

    def set_progress(self, typ, sid, transfered_size, iter_=None):
        """
        Change the progress of a transfer with new transfered size
        """
        file_props = FilesProp.getFilePropByType(typ, sid)
        full_size = file_props.size
        if full_size == 0:
            percent = 0
        else:
            percent = round(float(transfered_size) / full_size * 100, 1)
        if iter_ is None:
            iter_ = self.get_iter_by_sid(typ, sid)
        if iter_ is not None:
            just_began = False
            if self.model[iter_][Column.PERCENT] == 0 and int(percent > 0):
                just_began = True
            text = self._format_percent(percent)
            if transfered_size == 0:
                text += '0'
            else:
                text += helpers.convert_bytes(transfered_size)
            text += '/' + helpers.convert_bytes(full_size)
            # Kb/s

            # remaining time
            if file_props.offset:
                transfered_size -= file_props.offset
                full_size -= file_props.offset

            if file_props.elapsed_time > 0:
                file_props.transfered_size.append((file_props.last_time, transfered_size))
            if len(file_props.transfered_size) > 6:
                file_props.transfered_size.pop(0)
            eta, speed = self._get_eta_and_speed(full_size, transfered_size,
                    file_props)

            self.model.set(iter_, Column.PROGRESS, text)
            self.model.set(iter_, Column.PERCENT, int(percent))
            text = self._format_time(eta)
            text += '\n'
            #This should make the string Kb/s,
            #where 'Kb' part is taken from %s.
            #Only the 's' after / (which means second) should be translated.
            text += _('(%(filesize_unit)s/s)') % {'filesize_unit':
                    helpers.convert_bytes(speed)}
            self.model.set(iter_, Column.TIME, text)

            # try to guess what should be the status image
            if file_props.type_ == 'r':
                status = 'download'
            else:
                status = 'upload'
            if file_props.paused is True:
                status = 'pause'
            elif file_props.stalled is True:
                status = 'waiting'
            if file_props.connected is False:
                status = 'stop'
            self.model.set(iter_, 0, self.get_icon(status))
            if transfered_size == full_size:
                # If we are receiver and this is a jingle session
                if file_props.type_ == 'r' and  \
                file_props.session_type == 'jingle' and file_props.hash_:
                    # Show that we are computing the hash
                    self.set_status(file_props, 'computing')
                else:
                    self.set_status(file_props, 'ok')
            elif just_began:
                path = self.model.get_path(iter_)
                self.select_func(path)

    def get_iter_by_sid(self, typ, sid):
        """
        Return iter to the row, which holds file transfer, identified by the
        session id
        """
        iter_ = self.model.get_iter_first()
        while iter_:
            if typ + sid == self.model[iter_][Column.SID]:
                return iter_
            iter_ = self.model.iter_next(iter_)

    def __convert_date(self, epoch):
        # Converts date-time from seconds from epoch to iso 8601
        dt = datetime.utcfromtimestamp(epoch)
        return dt.isoformat() + 'Z'

    def get_send_file_props(self, account, contact, file_path, file_name,
    file_desc=''):
        """
        Create new file_props object and set initial file transfer
        properties in it
        """
        if os.path.isfile(file_path):
            stat = os.stat(file_path)
        else:
            ErrorDialog(_('Invalid File'), _('File: ') + file_path)
            return None
        if stat[6] == 0:
            ErrorDialog(_('Invalid File'),
            _('It is not possible to send empty files'))
            return None
        file_props = FilesProp.getNewFileProp(account,
                                    sid=helpers.get_random_string_16())
        mod_date = os.path.getmtime(file_path)
        file_props.file_name = file_path
        file_props.name = file_name
        file_props.date = self.__convert_date(mod_date)
        file_props.type_ = 's'
        file_props.desc = file_desc
        file_props.elapsed_time = 0
        file_props.size = stat[6]
        file_props.sender = account
        file_props.receiver = contact
        file_props.tt_account = account
        return file_props

    def add_transfer(self, account, contact, file_props):
        """
        Add new transfer to FT window and show the FT window
        """
        if file_props is None:
            return
        file_props.elapsed_time = 0
        iter_ = self.model.prepend()
        text_labels = '<b>' + _('Name: ') + '</b>\n'
        if file_props.type_ == 'r':
            text_labels += '<b>' + _('Sender: ') + '</b>'
        else:
            text_labels += '<b>' + _('Recipient: ') + '</b>'

        if file_props.type_ == 'r':
            file_name = os.path.split(file_props.file_name)[1]
        else:
            file_name = file_props.name
        text_props = GLib.markup_escape_text(file_name) + '\n'
        text_props += contact.get_shown_name()
        self.model.set(iter_, 1, text_labels, 2, text_props, Column.PULSE, -1, Column.SID,
                file_props.type_ + file_props.sid)
        self.set_progress(file_props.type_, file_props.sid, 0, iter_)
        if file_props.started is False:
            status = 'waiting'
        elif file_props.type_ == 'r':
            status = 'download'
        else:
            status = 'upload'
        file_props.tt_account = account
        self.set_status(file_props, status)
        self.set_cleanup_sensitivity()
        self.window.show_all()

    def on_transfers_list_row_activated(self, widget, path, col):
        # try to open the containing folder
        self.on_open_folder_menuitem_activate(widget)

    def set_cleanup_sensitivity(self):
        """
        Check if there are transfer rows and set cleanup_button sensitive, or
        insensitive if model is empty
        """
        if not self.model:
            self.cleanup_button.set_sensitive(False)
        else:
            self.cleanup_button.set_sensitive(True)

    def set_all_insensitive(self):
        """
        Make all buttons/menuitems insensitive
        """
        self.pause_button.set_sensitive(False)
        self.pause_menuitem.set_sensitive(False)
        self.continue_menuitem.set_sensitive(False)
        self.remove_menuitem.set_sensitive(False)
        self.cancel_button.set_sensitive(False)
        self.cancel_menuitem.set_sensitive(False)
        self.open_folder_menuitem.set_sensitive(False)
        self.set_cleanup_sensitivity()

    def set_buttons_sensitive(self, path, is_row_selected):
        """
        Make buttons/menuitems sensitive as appropriate to the state of file
        transfer located at path 'path'
        """
        if path is None:
            self.set_all_insensitive()
            return
        current_iter = self.model.get_iter(path)
        sid = self.model[current_iter][Column.SID]
        file_props = FilesProp.getFilePropByType(sid[0], sid[1:])
        self.remove_menuitem.set_sensitive(is_row_selected)
        self.open_folder_menuitem.set_sensitive(is_row_selected)
        is_stopped = False
        if is_transfer_stopped(file_props):
            is_stopped = True
        self.cancel_button.set_sensitive(not is_stopped)
        self.cancel_menuitem.set_sensitive(not is_stopped)
        if not is_row_selected:
            # no selection, disable the buttons
            self.set_all_insensitive()
        elif not is_stopped and file_props.continue_cb:
            if is_transfer_active(file_props):
                # file transfer is active
                self.toggle_pause_continue(True)
                self.pause_button.set_sensitive(True)
            elif is_transfer_paused(file_props):
                # file transfer is paused
                self.toggle_pause_continue(False)
                self.pause_button.set_sensitive(True)
            else:
                self.pause_button.set_sensitive(False)
                self.pause_menuitem.set_sensitive(False)
                self.continue_menuitem.set_sensitive(False)
        else:
            self.pause_button.set_sensitive(False)
            self.pause_menuitem.set_sensitive(False)
            self.continue_menuitem.set_sensitive(False)
        return True

    def selection_changed(self, args):
        """
        Selection has changed - change the sensitivity of the buttons/menuitems
        """
        selection = args
        selected = selection.get_selected_rows()
        if selected[1] != []:
            selected_path = selected[1][0]
            self.select_func(selected_path)
        else:
            self.set_all_insensitive()

    def select_func(self, path):
        is_selected = False
        selected = self.tree.get_selection().get_selected_rows()
        if selected[1] != []:
            selected_path = selected[1][0]
            if selected_path == path:
                is_selected = True
        self.set_buttons_sensitive(path, is_selected)
        self.set_cleanup_sensitivity()
        return True

    def on_cleanup_button_clicked(self, widget):
        i = len(self.model) - 1
        while i >= 0:
            iter_ = self.model.get_iter((i))
            sid = self.model[iter_][Column.SID]
            file_props = FilesProp.getFilePropByType(sid[0], sid[1:])
            if is_transfer_stopped(file_props):
                self._remove_transfer(iter_, sid, file_props)
            i -= 1
        self.tree.get_selection().unselect_all()
        self.set_all_insensitive()

    def toggle_pause_continue(self, status):
        if status:
            label = _('Pause')
            self.pause_button.set_label(label)
            self.pause_button.set_image(Gtk.Image.new_from_icon_name(
                    "media-playback-pause", Gtk.IconSize.MENU))

            self.pause_menuitem.set_sensitive(True)
            self.pause_menuitem.set_no_show_all(False)
            self.continue_menuitem.hide()
            self.continue_menuitem.set_no_show_all(True)

        else:
            label = _('_Continue')
            self.pause_button.set_label(label)
            self.pause_button.set_image(Gtk.Image.new_from_icon_name(
                    "media-playback-start", Gtk.IconSize.MENU))
            self.pause_menuitem.hide()
            self.pause_menuitem.set_no_show_all(True)
            self.continue_menuitem.set_sensitive(True)
            self.continue_menuitem.set_no_show_all(False)

    def on_pause_restore_button_clicked(self, widget):
        selected = self.tree.get_selection().get_selected()
        if selected is None or selected[1] is None:
            return
        s_iter = selected[1]
        sid = self.model[s_iter][Column.SID]
        file_props = FilesProp.getFilePropByType(sid[0], sid[1:])
        if is_transfer_paused(file_props):
            file_props.last_time = time.time()
            file_props.paused = False
            types = {'r' : 'download', 's' : 'upload'}
            self.set_status(file_props, types[sid[0]])
            self.toggle_pause_continue(True)
            if file_props.continue_cb:
                file_props.continue_cb()
        elif is_transfer_active(file_props):
            file_props.paused = True
            self.set_status(file_props, 'pause')
            # reset that to compute speed only when we resume
            file_props.transfered_size = []
            self.toggle_pause_continue(False)

    def on_cancel_button_clicked(self, widget):
        selected = self.tree.get_selection().get_selected()
        if selected is None or selected[1] is None:
            return
        s_iter = selected[1]
        sid = self.model[s_iter][Column.SID]
        file_props = FilesProp.getFilePropByType(sid[0], sid[1:])
        account = file_props.tt_account
        if account not in app.connections:
            return
        con = app.connections[account]
        # Check if we are in a IBB transfer
        if file_props.direction:
            con.CloseIBBStream(file_props)
        con.disconnect_transfer(file_props)
        self.set_status(file_props, 'stop')

    def on_notify_ft_complete_checkbox_toggled(self, widget):
        app.config.set('notify_on_file_complete',
                widget.get_active())

    def on_file_transfers_dialog_delete_event(self, widget, event):
        self.window.hide()
        return True # do NOT destroy window

    def on_close_button_clicked(self, widget):
        self.window.hide()

    def show_context_menu(self, event, iter_):
        # change the sensitive property of the buttons and menuitems
        if iter_:
            path = self.model.get_path(iter_)
            self.set_buttons_sensitive(path, True)

        event_button = gtkgui_helpers.get_possible_button_event(event)
        self.file_transfers_menu.show_all()
        self.file_transfers_menu.popup(None, self.tree, None, None,
                event_button, event.time)

    def on_transfers_list_key_press_event(self, widget, event):
        """
        When a key is pressed in the treeviews
        """
        iter_ = None
        try:
            iter_ = self.tree.get_selection().get_selected()[1]
        except TypeError:
            self.tree.get_selection().unselect_all()

        if iter_ is not None:
            path = self.model.get_path(iter_)
            self.tree.get_selection().select_path(path)

        if event.keyval == Gdk.KEY_Menu:
            self.show_context_menu(event, iter_)
            return True


    def on_transfers_list_button_release_event(self, widget, event):
        # hide tooltip, no matter the button is pressed
        path = None
        try:
            path = self.tree.get_path_at_pos(int(event.x), int(event.y))[0]
        except TypeError:
            self.tree.get_selection().unselect_all()
        if path is None:
            self.set_all_insensitive()
        else:
            self.select_func(path)

    def on_transfers_list_button_press_event(self, widget, event):
        # hide tooltip, no matter the button is pressed
        path, iter_ = None, None
        try:
            path = self.tree.get_path_at_pos(int(event.x), int(event.y))[0]
        except TypeError:
            self.tree.get_selection().unselect_all()
        if event.button == 3: # Right click
            if path:
                self.tree.get_selection().select_path(path)
                iter_ = self.model.get_iter(path)
            self.show_context_menu(event, iter_)
            if path:
                return True

    def on_open_folder_menuitem_activate(self, widget):
        selected = self.tree.get_selection().get_selected()
        if not selected or not selected[1]:
            return
        s_iter = selected[1]
        sid = self.model[s_iter][Column.SID]
        file_props = FilesProp.getFilePropByType(sid[0], sid[1:])
        if not file_props.file_name:
            return
        path = os.path.split(file_props.file_name)[0]
        if os.path.exists(path) and os.path.isdir(path):
            helpers.launch_file_manager(path)

    def on_cancel_menuitem_activate(self, widget):
        self.on_cancel_button_clicked(widget)

    def on_continue_menuitem_activate(self, widget):
        self.on_pause_restore_button_clicked(widget)

    def on_pause_menuitem_activate(self, widget):
        self.on_pause_restore_button_clicked(widget)

    def on_remove_menuitem_activate(self, widget):
        selected = self.tree.get_selection().get_selected()
        if not selected or not selected[1]:
            return
        s_iter = selected[1]
        sid = self.model[s_iter][Column.SID]
        file_props = FilesProp.getFilePropByType(sid[0], sid[1:])
        self._remove_transfer(s_iter, sid, file_props)
        self.set_all_insensitive()

    def on_file_transfers_window_key_press_event(self, widget, event):
        if event.keyval == Gdk.KEY_Escape: # ESCAPE
            self.window.hide()


class SendFileDialog(Gtk.ApplicationWindow):
    def __init__(self, send_callback, transient_for):
        active_window = app.app.get_active_window()
        Gtk.ApplicationWindow.__init__(self)
        self.set_name('SendFileDialog')
        self.set_application(app.app)
        self.set_show_menubar(False)
        self.set_resizable(True)
        self.set_default_size(400, 250)
        self.set_type_hint(Gdk.WindowTypeHint.DIALOG)
        self.set_transient_for(active_window)
        self.set_title(_('Choose a File to Send…'))
        self.set_destroy_with_parent(True)

        self._send_callback = send_callback

        xml = gtkgui_helpers.get_gtk_builder('send_file_dialog.ui')
        grid = xml.get_object('send_file_grid')

        self._filebox = xml.get_object('listbox')
        self._description = xml.get_object('description')

        self.add(grid)
        self.connect('key-press-event', self._key_press_event)

        xml.connect_signals(self)
        self.show_all()

    def _send(self, button):
        for file in self._filebox.get_children():
            self._send_callback(str(file.path), self._get_description())
        self.destroy()

    def _select_files(self, button):
        FileChooserDialog(self._set_files,
                          select_multiple=True,
                          transient_for=self,
                          path=app.config.get('last_send_dir'))

    def _set_files(self, filenames):
        # Clear the ListBox
        self._filebox.foreach(self._remove_widget, None)

        for file in filenames:
            row = FileRow(file)
            if row.path.is_dir():
                continue
            last_dir = row.path.parent
            self._filebox.add(row)
        self._filebox.show_all()
        app.config.set('last_send_dir', str(last_dir))

    def _remove_widget(self, widget, data):
        self._filebox.remove(widget)

    def _get_description(self):
        buffer_ = self._description.get_buffer()
        start, end = buffer_.get_bounds()
        return buffer_.get_text(start, end, False)

    def _key_press_event(self, widget, event):
        if event.keyval == Gdk.KEY_Escape:
            self.destroy()


class FileRow(Gtk.ListBoxRow):
    def __init__(self, path):
        Gtk.ListBoxRow.__init__(self)
        self.path = Path(path)
        label = Gtk.Label(label=self.path.name)
        label.set_ellipsize(Pango.EllipsizeMode.END)
        label.set_xalign(0)
        self.add(label)