# window.py
#
# Copyright 2024 Lucas Fryzek
#
# 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 <https://www.gnu.org/licenses/>.
#
# SPDX-License-Identifier: GPL-3.0-or-later
from gi.repository import Adw
from gi.repository import Gtk
from gi.repository import Gio
from gi.repository import GObject

from .message import WeegtkMessage
from .color import Color
from weegtk import config

import json

@Gtk.Template(resource_path='/com/fryzekconcepts/weegtk/gtk/chat.ui')
class WeegtkChat(Adw.Bin):
    __gtype_name__ = 'WeegtkChat'

    __gsignals__ = {
        "buffer_input" : (
            GObject.SignalFlags.RUN_FIRST,
            None,
            (str, str)
        )
    }

    window = Gtk.Template.Child()
    messages = Gtk.Template.Child()
    text_entry = Gtk.Template.Child()

    def __init__(self, data=None, **kwargs):
        super().__init__(**kwargs)

        self.data = data or {}

        self.model = Gtk.StringList()
        self.select = Gtk.NoSelection(model=self.model)

        self.factory = Gtk.SignalListItemFactory()
        self.factory.connect("setup", self.setup_list_item)
        self.factory.connect("bind", self.bind_list_item)

        self.messages.set_model(self.select)
        self.messages.set_factory(self.factory)

        self.color = Color(config.color_options(), False)

        self.auto_scroll = True
        self.sticky = True
        adj = self.window.get_vadjustment()
        adj.connect("value-changed", self.scroll_changes)
        adj.connect("notify::upper", self.upper_notify)

    def is_at_bottom(self):
        adj = self.window.get_vadjustment()
        return (adj.get_value() + adj.get_page_size()) == adj.get_upper()

    def scroll_changes(self, *args):
        is_at_bottom = self.is_at_bottom()
        if self.auto_scroll:
            if is_at_bottom:
                self.auto_scroll = False
                self.sticky = True
            else:
                self.scroll_bottom()
        else:
            self.sticky = is_at_bottom

    def upper_notify(self, *args):
        if self.sticky:
            self.scroll_bottom()

    def scroll_bottom(self, *args):
        n_items = self.model.get_n_items()
        self.auto_scroll = True
        self.messages.scroll_to(n_items - 1, Gtk.ListScrollFlags.FOCUS)
        self.window.emit("scroll_child", Gtk.ScrollType.END, False)

    def setup_list_item(self, factory, list_item, *user_data):
        message = WeegtkMessage()
        list_item.set_child(message)
        pass

    def bind_list_item(self, factory, list_item, *user_data):
        text = list_item.get_item().get_string()
        data = json.loads(text)
        message = list_item.get_child()
        message.set_contents(data)

    def is_chat(self):
        buf_type = self.data['local_variables']['type'] if 'type' in self.data['local_variables'] else None
        return buf_type is not None and (buf_type == "private" or buf_type == "channel")

    def pointer(self):
        """Return pointer on buffer."""
        return self.data.get('__path', [''])[0]

    def parse_out_colors(self, text):
        clean_text = self.color.convert(text)
        return clean_text

    def display(self, time, prefix, text, forcecolor=None):
        # TODO using JSON here seems a bit ineffcient
        # See if its possible to make a model that uses
        # our own custom struct
        user = self.parse_out_colors(prefix)
        msg = self.parse_out_colors(text)
        count = self.model.get_n_items()

        if count != 0:
            last = self.model.get_string(count - 1)
            last_data = json.loads(last)
            if last_data["type"] == "message" and last_data["username"] == user:
                last_data["text"].append(msg)
                self.model.splice(count - 1, 1, [json.dumps(last_data)])
                return

        data = {
            "username": user,
            "text": [msg],
            "type": "msg"
        }
        self.model.append(json.dumps(data))

    @Gtk.Template.Callback()
    def entry_activate(self, *args):
        entry_buffer = self.text_entry.get_buffer()
        text = entry_buffer.get_text()
        entry_buffer.set_text("", 0)
        self.emit("buffer_input", self.data['full_name'], text)