# Copyright (C) 2018 Marcin Mielniczuk <marmistrz.dev AT zoho.eu>
# Copyright (C) 2018 Philipp Hörist <philipp AT hoerist.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/>.

from typing import Any
from typing import List
from typing import Tuple
from typing import Optional

import os
import sys
import logging
import xml.etree.ElementTree as ET
from pathlib import Path

from gi.repository import Gdk
from gi.repository import Gtk
from gi.repository import GLib
import cairo

from gajim.common import app
from gajim.common import configpaths
from gajim.common import i18n
from gajim.common.i18n import _

from gajim.gtk.const import GajimIconSet

_icon_theme = Gtk.IconTheme.get_default()
if _icon_theme is not None:
    _icon_theme.append_search_path(configpaths.get('ICONS'))

log = logging.getLogger('gajim.gtk.util')


class NickCompletionGenerator:
    def __init__(self, self_nick: str) -> None:
        self.nick = self_nick
        self.sender_list = []  # type: List[str]
        self.attention_list = []  # type: List[str]

    def change_nick(self, new_nick: str) -> None:
        self.nick = new_nick

    def record_message(self, contact: str, highlight: bool) -> None:
        if contact == self.nick:
            return

        log.debug('Recorded a message from %s, highlight; %s', contact,
                  highlight)
        if highlight:
            try:
                self.attention_list.remove(contact)
            except ValueError:
                pass
            if len(self.attention_list) > 6:
                self.attention_list.pop(0)  # remove older
            self.attention_list.append(contact)

        # TODO implement it in a more efficient way
        # Currently it's O(n*m + n*s), where n is the number of participants and
        # m is the number of messages processed, s - the number of times the
        # suggestions are requested
        #
        # A better way to do it would be to keep a dict: contact -> timestamp
        # with expected O(1) insert, and sort it by timestamps in O(n log n)
        # for each suggestion (currently generating the suggestions is O(n))
        # this would give the expected complexity of O(m + s * n log n)
        try:
            self.sender_list.remove(contact)
        except ValueError:
            pass
        self.sender_list.append(contact)

    def contact_renamed(self, contact_old: str, contact_new: str) -> None:
        log.debug('Contact %s renamed to %s', contact_old, contact_new)
        for lst in (self.attention_list, self.sender_list):
            for idx, contact in enumerate(lst):
                if contact == contact_old:
                    lst[idx] = contact_new


    def generate_suggestions(self, nicks: List[str],
                             beginning: str) -> List[str]:
        """
        Generate the order of suggested MUC autocompletions

        `nicks` is the list of contacts currently participating in a MUC
        `beginning` is the text already typed by the user
        """
        def nick_matching(nick: str) -> bool:
            return nick != self.nick \
                and nick.lower().startswith(beginning.lower())

        if beginning == '':
            # empty message, so just suggest recent mentions
            potential_matches = self.attention_list
        else:
            # nick partially typed, try completing it
            potential_matches = self.sender_list

        potential_matches_set = set(potential_matches)
        log.debug('Priority matches: %s', potential_matches_set)

        matches = [n for n in potential_matches if nick_matching(n)]
        # the most recent nick is the last one on the list
        matches.reverse()

        # handle people who have not posted/mentioned us
        other_nicks = [
            n for n in nicks if nick_matching(n) and n not in potential_matches_set
        ]
        other_nicks.sort(key=str.lower)
        log.debug('Other matches: %s', other_nicks)

        return matches + other_nicks


class Builder:
    def __init__(self,
                 filename: str,
                 widgets: List[str] = None,
                 domain: str = None,
                 gettext_: Any = None) -> None:
        self._builder = Gtk.Builder()

        if domain is None:
            domain = i18n.DOMAIN
        self._builder.set_translation_domain(domain)

        if gettext_ is None:
            gettext_ = _

        file_path = os.path.join(configpaths.get('GUI'), filename)

        if sys.platform == "win32":
            # This is a workaround for non working translation on Windows
            tree = ET.parse(file_path)
            for node in tree.iter():
                if 'translatable' in node.attrib and node.text is not None:
                    node.text = gettext_(node.text)

            xml_text = ET.tostring(tree.getroot(),
                                   encoding='unicode',
                                   method='xml')

            if widgets is not None:
                self._builder.add_objects_from_string(xml_text, widgets)
            else:
                # Workaround
                # https://gitlab.gnome.org/GNOME/pygobject/issues/255
                Gtk.Builder.__mro__[1].add_from_string(
                    self._builder, xml_text, len(xml_text.encode("utf-8")))
        else:
            if widgets is not None:
                self._builder.add_objects_from_file(file_path, widgets)
            else:
                self._builder.add_from_file(file_path)

    def __getattr__(self, name):
        try:
            return getattr(self._builder, name)
        except AttributeError:
            return self._builder.get_object(name)


def get_builder(file_name: str, widgets: List[str] = None) -> Builder:
    return Builder(file_name, widgets)


def set_urgency_hint(window: Any, setting: bool) -> None:
    if app.config.get('use_urgency_hint'):
        window.set_urgency_hint(setting)


def icon_exists(name: str) -> bool:
    return _icon_theme.has_icon(name)


def load_icon(icon_name, widget=None, size=16, pixbuf=False,
              scale=None, flags=Gtk.IconLookupFlags.FORCE_SIZE):

    if widget is not None:
        scale = widget.get_scale_factor()

    if not scale:
        log.warning('Could not determine scale factor')
        scale = 1

    try:
        iconinfo = _icon_theme.lookup_icon_for_scale(
            icon_name, size, scale, flags)
        if pixbuf:
            return iconinfo.load_icon()
        return iconinfo.load_surface(None)
    except GLib.GError as error:
        log.error('Unable to load icon %s: %s', icon_name, str(error))


def get_app_icon_list(scale_widget):
    pixbufs = []
    for size in (16, 32, 48, 64, 128):
        pixbuf = load_icon('org.gajim.Gajim', scale_widget, size, pixbuf=True)
        if pixbuf is not None:
            pixbufs.append(pixbuf)
    return pixbufs


def get_icon_name(name: str,
                  iconset: Optional[str] = None,
                  transport: Optional[str] = None) -> str:
    if name == 'not in roster':
        name = 'notinroster'

    if iconset is not None:
        return '%s-%s' % (iconset, name)

    if transport is not None:
        return '%s-%s' % (transport, name)

    iconset = app.config.get('iconset')
    if not iconset:
        iconset = app.config.DEFAULT_ICONSET
    return '%s-%s' % (iconset, name)


def load_user_iconsets():
    iconsets_path = Path(configpaths.get('MY_ICONSETS'))
    if not iconsets_path.exists():
        return

    for path in iconsets_path.iterdir():
        if not path.is_dir():
            continue
        log.info('Found iconset: %s', path.stem)
        _icon_theme.append_search_path(str(path))


def get_available_iconsets():
    iconsets = []
    for iconset in GajimIconSet:
        iconsets.append(iconset.value)

    iconsets_path = Path(configpaths.get('MY_ICONSETS'))
    if not iconsets_path.exists():
        return iconsets

    for path in iconsets_path.iterdir():
        if not path.is_dir():
            continue
        iconsets.append(path.stem)
    return iconsets


def get_total_screen_geometry() -> Tuple[int, int]:
    screen = Gdk.Screen.get_default()
    window = Gdk.Screen.get_root_window(screen)
    width, height = window.get_width(), window.get_height()
    log.debug('Get screen geometry: %s %s', width, height)
    return width, height


def resize_window(window: Gtk.Window, width: int, height: int) -> None:
    """
    Resize window, but also checks if huge window or negative values
    """
    screen_w, screen_h = get_total_screen_geometry()
    if not width or not height:
        return
    if width > screen_w:
        width = screen_w
    if height > screen_h:
        height = screen_h
    window.resize(abs(width), abs(height))


def move_window(window: Gtk.Window, pos_x: int, pos_y: int) -> None:
    """
    Move the window, but also check if out of screen
    """
    screen_w, screen_h = get_total_screen_geometry()
    if pos_x < 0:
        pos_x = 0
    if pos_y < 0:
        pos_y = 0
    width, height = window.get_size()
    if pos_x + width > screen_w:
        pos_x = screen_w - width
    if pos_y + height > screen_h:
        pos_y = screen_h - height
    window.move(pos_x, pos_y)


def get_completion_liststore(entry: Gtk.Entry) -> Gtk.ListStore:
    """
    Create a completion model for entry widget completion list consists of
    (Pixbuf, Text) rows
    """
    completion = Gtk.EntryCompletion()
    liststore = Gtk.ListStore(str, str)

    render_pixbuf = Gtk.CellRendererPixbuf()
    completion.pack_start(render_pixbuf, False)
    completion.add_attribute(render_pixbuf, 'icon_name', 0)

    render_text = Gtk.CellRendererText()
    completion.pack_start(render_text, True)
    completion.add_attribute(render_text, 'text', 1)
    completion.set_property('text_column', 1)
    completion.set_model(liststore)
    entry.set_completion(completion)
    return liststore


def get_cursor(attr: str) -> Gdk.Cursor:
    display = Gdk.Display.get_default()
    cursor = getattr(Gdk.CursorType, attr)
    return Gdk.Cursor.new_for_display(display, cursor)


def scroll_to_end(widget: Gtk.ScrolledWindow) -> bool:
    """Scrolls to the end of a GtkScrolledWindow.

    Args:
        widget (GtkScrolledWindow)

    Returns:
        bool: The return value is False so it can be used with GLib.idle_add.
    """
    adj_v = widget.get_vadjustment()
    if adj_v is None:
        # This can happen when the Widget is already destroyed when called
        # from GLib.idle_add
        return False
    max_scroll_pos = adj_v.get_upper() - adj_v.get_page_size()
    adj_v.set_value(max_scroll_pos)

    adj_h = widget.get_hadjustment()
    adj_h.set_value(0)
    return False


def at_the_end(widget: Gtk.ScrolledWindow) -> bool:
    """Determines if a Scrollbar in a GtkScrolledWindow is at the end.

    Args:
        widget (GtkScrolledWindow)

    Returns:
        bool: The return value is True if at the end, False if not.
    """
    adj_v = widget.get_vadjustment()
    max_scroll_pos = adj_v.get_upper() - adj_v.get_page_size()
    return adj_v.get_value() == max_scroll_pos


def get_image_button(icon_name, tooltip, toggle=False):
    if toggle:
        button = Gtk.ToggleButton()
        image = Gtk.Image.new_from_icon_name(icon_name, Gtk.IconSize.MENU)
        button.set_image(image)
    else:
        button = Gtk.Button.new_from_icon_name(icon_name, Gtk.IconSize.MENU)
    button.set_tooltip_text(tooltip)
    return button


def get_image_from_icon_name(icon_name: str, scale: int) -> Any:
    icon = get_icon_name(icon_name)
    surface = _icon_theme.load_surface(icon, 16, scale, None, 0)
    return Gtk.Image.new_from_surface(surface)


def python_month(month: int) -> int:
    return month + 1


def gtk_month(month: int) -> int:
    return month - 1


def convert_rgb_to_hex(rgb_string: str) -> str:
    rgb = Gdk.RGBA()
    rgb.parse(rgb_string)
    rgb.to_color()

    red = int(rgb.red * 255)
    green = int(rgb.green * 255)
    blue = int(rgb.blue * 255)
    return '#%02x%02x%02x' % (red, green, blue)


def get_monitor_scale_factor() -> int:
    display = Gdk.Display.get_default()
    monitor = display.get_primary_monitor()
    if monitor is None:
        log.warning('Could not determine scale factor')
        return 1
    return monitor.get_scale_factor()


def get_metacontact_surface(icon_name, expanded, scale):
    icon_size = 16
    state_surface = _icon_theme.load_surface(
        icon_name, icon_size, scale, None, 0)
    if 'event' in icon_name:
        return state_surface

    if expanded:
        icon = get_icon_name('opened')
        expanded_surface = _icon_theme.load_surface(
            icon, icon_size, scale, None, 0)
    else:
        icon = get_icon_name('closed')
        expanded_surface = _icon_theme.load_surface(
            icon, icon_size, scale, None, 0)
    ctx = cairo.Context(state_surface)
    ctx.rectangle(0, 0, icon_size, icon_size)
    ctx.set_source_surface(expanded_surface)
    ctx.fill()
    return state_surface


def get_affiliation_surface(icon_name, affiliation, scale):
    surface = _icon_theme.load_surface(
        icon_name, 16, scale, None, 0)

    ctx = cairo.Context(surface)
    ctx.rectangle(16 - 4, 16 - 4, 4, 4)
    if affiliation == 'owner':
        ctx.set_source_rgb(204/255, 0, 0)
    elif affiliation == 'admin':
        ctx.set_source_rgb(255/255, 140/255, 0)
    elif affiliation == 'member':
        ctx.set_source_rgb(0, 255/255, 0)
    ctx.fill()
    return surface


def get_show_in_roster(event, session=None):
    """
    Return True if this event must be shown in roster, else False
    """
    if event == 'gc_message_received':
        return True
    if event == 'message_received':
        if app.config.get('autopopup_chat_opened'):
            return True
        if session and session.control:
            return False
    return True


def get_show_in_systray(type_, jid):
    """
    Return True if this event must be shown in systray, else False
    """
    notify = app.config.get('notify_on_all_muc_messages')
    notify_for_jid = app.config.get_per(
        'rooms', jid, 'notify_on_all_messages')

    if type_ == 'printed_gc_msg' and not notify and not notify_for_jid:
        # it's not an highlighted message, don't show in systray
        return False
    return app.config.get('trayicon_notification_on_events')