# 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/>.

from __future__ import annotations

from typing import Optional
from typing import Union

import logging
import time
from datetime import datetime
from pathlib import Path

from gi.repository import GdkPixbuf
from gi.repository import GLib
from gi.repository import Gtk

from gajim.common import app
from gajim.common import ged
from gajim.common.const import AvatarSize
from gajim.common.const import KindConstant
from gajim.common.events import FileCompleted
from gajim.common.events import FileError
from gajim.common.events import FileHashError
from gajim.common.events import FileProgress
from gajim.common.events import FileRequestError
from gajim.common.events import FileRequestReceivedEvent
from gajim.common.events import FileRequestSent
from gajim.common.events import FileSendError
from gajim.common.events import JingleErrorReceived
from gajim.common.events import JingleFtCancelledReceived
from gajim.common.file_props import FileProp
from gajim.common.file_props import FilesProp
from gajim.common.helpers import open_file
from gajim.common.helpers import show_in_folder
from gajim.common.i18n import _
from gajim.common.modules.contacts import BareContact
from gajim.common.storage.archive import ConversationRow

from gajim.gtk.builder import get_builder
from gajim.gtk.conversation.rows.base import BaseRow
from gajim.gtk.conversation.rows.widgets import DateTimeLabel
from gajim.gtk.conversation.rows.widgets import NicknameLabel
from gajim.gtk.util import format_eta

TransferEventT = Union[FileRequestReceivedEvent, FileRequestSent]

log = logging.getLogger('gajim.gtk.conversation.rows.file_transfer_jingle')


class FileTransferJingleRow(BaseRow):
    def __init__(self,
                 account: str,
                 contact: BareContact,
                 event: Optional[TransferEventT] = None,
                 db_message: Optional[ConversationRow] = None
                 ) -> None:
        BaseRow.__init__(self, account)

        self.type = 'file-transfer'

        if db_message is not None:
            timestamp = db_message.time
        else:
            timestamp = time.time()
        self.timestamp = datetime.fromtimestamp(timestamp)
        self.db_timestamp = timestamp

        self._contact = contact

        if db_message is not None:
            assert db_message.additional_data is not None
            sid = db_message.additional_data.get_value('gajim', 'sid')
            assert sid is not None
            self._file_props = FilesProp.getFilePropBySid(sid)
            if self._file_props is None:
                log.debug('File prop not found for SID: %s', sid)
            self.log_line_id = db_message.log_line_id
        else:
            assert event is not None
            self._file_props = event.file_props
        self._start_time = 0

        if app.settings.get('use_kib_mib'):
            self._units = GLib.FormatSizeFlags.IEC_UNITS
        else:
            self._units = GLib.FormatSizeFlags.DEFAULT

        avatar_placeholder = Gtk.Box()
        avatar_placeholder.set_size_request(AvatarSize.ROSTER, -1)
        avatar_placeholder.set_valign(Gtk.Align.START)
        self.grid.attach(avatar_placeholder, 0, 0, 1, 1)

        if db_message is not None:
            if db_message.kind == KindConstant.FILE_TRANSFER_INCOMING:
                contact = self._contact
                is_self = True
            else:
                contact = self._client.get_module('Contacts').get_contact(
                    str(self._client.get_own_jid().bare))
                is_self = False
        else:
            if isinstance(event, FileRequestSent):
                contact = self._client.get_module('Contacts').get_contact(
                    str(self._client.get_own_jid().bare))
                is_self = False
            else:
                contact = self._contact
                is_self = True

        scale = self.get_scale_factor()
        avatar = contact.get_avatar(AvatarSize.ROSTER, scale, add_show=False)
        assert not isinstance(avatar, GdkPixbuf.Pixbuf)
        avatar_image = Gtk.Image.new_from_surface(avatar)
        avatar_placeholder.add(avatar_image)

        name_widget = NicknameLabel(contact.name, is_self)
        name_widget.set_halign(Gtk.Align.START)
        name_widget.set_valign(Gtk.Align.START)

        timestamp_widget = DateTimeLabel(self.timestamp)
        timestamp_widget.set_hexpand(True)
        timestamp_widget.set_valign(Gtk.Align.START)

        meta_box = Gtk.Box()
        meta_box.set_spacing(6)
        meta_box.add(name_widget)
        meta_box.add(timestamp_widget)
        self.grid.attach(meta_box, 1, 0, 1, 1)

        self._ui = get_builder('file_transfer_jingle.ui')
        self.grid.attach(self._ui.transfer_box, 1, 1, 1, 1)
        self._ui.transfer_box.set_halign(Gtk.Align.START)

        self._ui.connect_signals(self)

        self.show_all()

        if db_message is not None:
            self._reconstruct_transfer()
        else:
            assert event is not None
            self._display_transfer_info(event.name)

        if self._file_props is None:
            return

        app.ged.register_event_handler(
            'file-completed', ged.GUI1, self.process_event)
        app.ged.register_event_handler(
            'file-hash-error', ged.GUI1, self.process_event)
        app.ged.register_event_handler(
            'file-send-error', ged.GUI1, self.process_event)
        app.ged.register_event_handler(
            'file-request-error', ged.GUI1, self.process_event)
        app.ged.register_event_handler(
            'file-progress', ged.GUI1, self.process_event)
        app.ged.register_event_handler(
            'file-error', ged.GUI1, self.process_event)
        app.ged.register_event_handler(
            'jingle-error-received', ged.GUI1, self.process_event)
        app.ged.register_event_handler(
            'jingle-ft-cancelled-received', ged.GUI1, self.process_event)

    def _reconstruct_transfer(self) -> None:
        self._show_file_infos()
        if self._file_props is None:
            self._ui.transfer_action.set_text(_('File Transfer'))
            self._ui.error_label.set_text(_('No info available'))
            self._ui.action_stack.set_visible_child_name('error')
            return

        if self._file_props.completed:
            self._show_completed()
            return

        if self._file_props.stopped:
            self._ui.action_stack.set_visible_child_name('error')
            self._ui.transfer_action.set_text(_('File Transfer Stopped'))
            self._ui.error_label.set_text('')
            return

        if self._file_props.error is not None:
            self._show_error(self._file_props)
            return

        self._ui.transfer_action.set_text(_('File Offered…'))

    def _display_transfer_info(self, event_name: str) -> None:
        if event_name == 'file-request-sent':
            self._ui.action_stack.set_visible_child_name('progress')
            self._ui.progress_label.set_text(_('Waiting…'))

        self._ui.transfer_action.set_text(_('File Offered…'))
        self._show_file_infos()

    def _show_file_infos(self) -> None:
        if self._file_props is None:
            self._ui.file_name.hide()
            self._ui.file_description.hide()
            self._ui.file_size.hide()
            return

        file_name = GLib.markup_escape_text(str(self._file_props.name))
        if self._file_props.mime_type:
            file_name = f'{file_name} ({self._file_props.mime_type})'
        self._ui.file_name.set_text(file_name)
        self._ui.file_name.set_tooltip_text(file_name)

        if self._file_props.desc:
            desc = GLib.markup_escape_text(self._file_props.desc)
            self._ui.file_description.set_text(desc)
            self._ui.file_description.set_tooltip_text(desc)
        else:
            self._ui.file_description.hide()

        assert self._file_props.size is not None
        self._ui.file_size.set_text(
            GLib.format_size_full(self._file_props.size, self._units))

    def process_event(self, event: TransferEventT) -> None:
        assert self._file_props is not None

        if isinstance(event, JingleErrorReceived):
            if event.sid != self._file_props.sid:
                return
            self._ui.action_stack.set_visible_child_name('error')
            self._ui.transfer_action.set_text(_('File Transfer Cancelled'))
            self._ui.error_label.set_text(event.reason)
            return

        if isinstance(event, JingleFtCancelledReceived):
            if event.sid != self._file_props.sid:
                return
            self._ui.action_stack.set_visible_child_name('error')
            self._ui.transfer_action.set_text(_('File Transfer Cancelled'))
            self._ui.error_label.set_text(
                _('%(name)s cancelled the transfer (%(reason)s)') % {
                    'name': self._contact.name,
                    'reason': event.reason})
            return

        if event.file_props.sid != self._file_props.sid:
            return

        if isinstance(event, FileCompleted):
            self._show_completed()
        elif isinstance(event, FileError):
            self._show_error(event.file_props)
        elif isinstance(event, FileHashError):
            self._ui.action_stack.set_visible_child_name('hash-error')
            self._ui.transfer_action.set_text(_('File Verification Failed'))
        elif isinstance(event, (FileRequestError, FileSendError)):
            self._ui.action_stack.set_visible_child_name('error')
            self._ui.transfer_action.set_text(_('File Transfer Cancelled'))
            error_text = _('Connection with %s could not be '
                           'established.') % self._contact.name
            if event.error_msg:
                error_text = f'{error_text} ({event.error_msg})'
            self._ui.error_label.set_text(error_text)

        elif isinstance(event, FileProgress):
            self._update_progress(event.file_props)

    def _update_progress(self, file_props: FileProp) -> None:
        self._ui.action_stack.set_visible_child_name('progress')
        self._ui.transfer_action.set_text(_('Transferring File…'))

        time_now = time.time()
        full_size = file_props.size
        assert full_size is not None

        if file_props.type_ == 's':
            # We're sending a file
            if self._start_time == 0:
                self._start_time = time_now
                return
            if not file_props.transferred_size:
                return
            transferred_size = file_props.transferred_size[-1][1]
        else:
            # We're receiving a file
            transferred_size = file_props.received_len
            assert transferred_size is not None

        if full_size == 0:
            return

        bytes_sec = int(
            round(transferred_size / (time_now - self._start_time), 1))
        speed = f'{GLib.format_size_full(bytes_sec, self._units)}/s'
        self._ui.progress_label.set_tooltip_text(_('Speed: %s') % speed)

        if bytes_sec == 0:
            eta = '∞'
        else:
            eta = format_eta(round(
                (full_size - transferred_size) / bytes_sec))

        progress = float(transferred_size) / full_size
        self._ui.progress_label.set_text(
            _('%(progress)s %% (%(time)s remaining)') % {
                'progress': round(progress * 100),
                'time': eta})

        self._ui.progress_bar.set_fraction(progress)

    def _show_error(self, file_props: FileProp) -> None:
        self._ui.action_stack.set_visible_child_name('error')
        self._ui.transfer_action.set_text(_('File Transfer Stopped'))
        if file_props.error == -1:
            self._ui.error_label.set_text(
                _('%s stopped the transfer') % self._contact.name)
        elif file_props.error == -6:
            self._ui.error_label.set_text(_('Error opening file'))
        elif file_props.error == -12:
            self._ui.error_label.set_text(_('SSL certificate error'))
        else:
            self._ui.error_label.set_text(_('An error occurred'))

    def _show_completed(self) -> None:
        self._ui.action_stack.set_visible_child_name('complete')
        self._ui.transfer_action.set_text(_('File Transfer Completed'))

    def _on_accept_file_request(self, _button: Gtk.Button) -> None:
        app.interface.instances['file_transfers'].on_file_request_accepted(
            self._account, self._contact, self._file_props)
        self._start_time = time.time()

    def _on_reject_file_request(self, _button: Gtk.Button) -> None:
        self._client.get_module('Bytestream').send_file_rejection(
            self._file_props)
        assert self._file_props is not None
        self._file_props.stopped = True
        self._ui.action_stack.set_visible_child_name('rejected')
        self._ui.transfer_action.set_text(_('File Transfer Cancelled'))

    def _on_open_file(self, _button: Gtk.Button) -> None:
        assert self._file_props is not None
        assert self._file_props.file_name is not None
        open_file(Path(self._file_props.file_name))

    def _on_open_folder(self, _button: Gtk.Button) -> None:
        assert self._file_props is not None
        assert self._file_props.file_name is not None
        show_in_folder(Path(self._file_props.file_name))

    def _on_bad_hash_retry(self, _button: Gtk.Button) -> None:
        app.interface.instances['file_transfers'].show_hash_error(
            self._contact.jid,
            self._file_props,
            self._account)

    def _on_cancel_transfer(self, _button: Gtk.Button) -> None:
        app.interface.instances['file_transfers'].cancel_transfer(
            self._file_props)

    def _on_show_transfers(self, _button: Gtk.Button) -> None:
        file_transfers = app.interface.instances['file_transfers']
        if file_transfers.window.get_property('visible'):
            file_transfers.window.present()
        else:
            file_transfers.window.show_all()
