# This file is part of Gajim.
#
# SPDX-License-Identifier: GPL-3.0-only

from __future__ import annotations

from typing import Any

import dataclasses
from enum import Enum

from gi.repository import GObject
from gi.repository import Gtk

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

from gajim.gtk.dropdown import GajimDropDown
from gajim.gtk.util import SignalManager


class ChatTypeFilter(Enum):
    ALL = "all"
    CHAT = "chats"
    GROUPCHAT = "group_chats"


@dataclasses.dataclass
class ChatFilters:
    type: ChatTypeFilter = ChatTypeFilter.ALL
    group: str | None = None
    account: str | None = None


class ChatFilter(Gtk.Overlay, SignalManager):

    __gsignals__ = {
        "filter-changed": (GObject.SignalFlags.RUN_LAST, None, ()),
    }

    def __init__(self) -> None:
        Gtk.Overlay.__init__(self, halign=Gtk.Align.CENTER, tooltip_text=_("Filters"))
        SignalManager.__init__(self)

        self._block_signal = False

        menu_button = Gtk.MenuButton()
        self._connect(menu_button, "notify::active", self._on_menu_button_activated)
        icon = Gtk.Image.new_from_icon_name("feather-filter-symbolic")
        menu_button.set_child(icon)
        self.set_child(menu_button)

        self._filter_active_dot = Gtk.Box(
            halign=Gtk.Align.END,
            valign=Gtk.Align.START,
            visible=False,
            width_request=12,
            height_request=12,
        )
        self._filter_active_dot.add_css_class("chat-filter-active")
        self.add_overlay(self._filter_active_dot)

        self._popover = Gtk.Popover(autohide=True, cascade_popdown=True)
        menu_button.set_popover(self._popover)

        popover_content = Gtk.Grid(row_spacing=6, column_spacing=12)
        popover_content.add_css_class("p-6")
        self._popover.set_child(popover_content)

        popover_title = Gtk.Label(label=_("Filter Chats"), margin_bottom=6)
        popover_title.add_css_class("bold")
        popover_content.attach(popover_title, 0, 0, 2, 1)

        chat_type_label = Gtk.Label(label=_("Chat Type"), halign=Gtk.Align.END)
        chat_type_label.add_css_class("dim-label")
        popover_content.attach(chat_type_label, 0, 1, 1, 1)

        chat_type_data = {
            ChatTypeFilter.ALL: _("All"),
            ChatTypeFilter.CHAT: _("Chats"),
            ChatTypeFilter.GROUPCHAT: _("Group Chats"),
        }
        self._chat_type_drop_down = GajimDropDown(fixed_width=12, data=chat_type_data)
        self._connect(
            self._chat_type_drop_down, "notify::selected", self._on_chat_type_selected
        )
        popover_content.attach(self._chat_type_drop_down, 1, 1, 1, 1)

        roster_groups_label = Gtk.Label(label=_("Group"), halign=Gtk.Align.END)
        roster_groups_label.add_css_class("dim-label")
        popover_content.attach(roster_groups_label, 0, 2, 1, 1)

        self._roster_groups_drop_down = GajimDropDown(fixed_width=12)
        self._connect(
            self._roster_groups_drop_down,
            "notify::selected",
            self._on_roster_group_selected,
        )
        popover_content.attach(self._roster_groups_drop_down, 1, 2, 1, 1)

        self._account_label = Gtk.Label(label=_("Account"), halign=Gtk.Align.END)
        self._account_label.add_css_class("dim-label")
        popover_content.attach(self._account_label, 0, 3, 1, 1)

        self._account_drop_down = GajimDropDown(fixed_width=12)
        self._connect(
            self._account_drop_down,
            "notify::selected",
            self._on_account_selected,
        )
        popover_content.attach(self._account_drop_down, 1, 3, 1, 1)

        reset_button = Gtk.Button(
            label=_("Reset Filters"), halign=Gtk.Align.CENTER, margin_top=6
        )
        self._connect(reset_button, "clicked", self._on_reset_button_clicked)
        popover_content.attach(reset_button, 0, 4, 2, 1)

    def do_unroot(self) -> None:
        Gtk.Overlay.do_unroot(self)
        self._disconnect_all()
        app.check_finalize(self)

    def get_filters(self) -> ChatFilters:
        chat_type_item = self._chat_type_drop_down.get_selected_key()
        assert chat_type_item is not None
        roster_group = self._roster_groups_drop_down.get_selected_key()
        account = self._account_drop_down.get_selected_key()

        return ChatFilters(
            type=chat_type_item,
            group=roster_group,
            account=account,
        )

    def reset(self) -> None:
        self._chat_type_drop_down.set_selected(0)
        self._roster_groups_drop_down.set_selected(0)
        self._account_drop_down.set_selected(0)

    def _on_menu_button_activated(
        self, menu_button: Gtk.MenuButton, *args: Any
    ) -> None:
        if not menu_button.get_active():
            return

        roster_group_key = self._roster_groups_drop_down.get_selected_key()
        account_key = self._account_drop_down.get_selected_key()

        roster_groups = self._get_roster_groups()
        accounts = self._get_accounts()

        show_account_filter = len(accounts) > 2
        self._account_drop_down.set_visible(show_account_filter)
        self._account_label.set_visible(show_account_filter)

        self._block_signal = True
        self._roster_groups_drop_down.set_data(roster_groups)
        self._roster_groups_drop_down.select_key(roster_group_key)

        self._account_drop_down.set_data(accounts)
        self._account_drop_down.select_key(account_key)
        self._block_signal = False

    def _update(self) -> None:
        filters = self.get_filters()
        active = (
            filters.type != ChatTypeFilter.ALL
            or filters.group is not None
            or filters.account is not None
        )
        if active:
            self.set_tooltip_text(_("Filters (active)"))
        else:
            self.set_tooltip_text(_("Filters"))

        self._filter_active_dot.set_visible(active)
        self._popover.grab_focus()

    def _on_chat_type_selected(self, _dropdown: GajimDropDown, *args: Any) -> None:
        self._update()
        if not self._block_signal:
            self.emit("filter-changed")

    def _on_roster_group_selected(self, _dropdown: GajimDropDown, *args: Any) -> None:
        self._update()
        if not self._block_signal:
            self.emit("filter-changed")

    def _on_account_selected(self, _dropdown: GajimDropDown, *args: Any) -> None:
        self._update()
        if not self._block_signal:
            self.emit("filter-changed")

    def _on_reset_button_clicked(self, _button: Gtk.Button) -> None:
        self.reset()

    def _get_roster_groups(self) -> dict[str | None, str]:
        roster_groups: dict[str | None, str] = {None: _("All")}

        groups: set[str] = set()
        for account, _label in app.get_enabled_accounts_with_labels():
            client = app.get_client(account)
            groups.update(client.get_module("Roster").get_groups())

        for group in sorted(groups):
            roster_groups[group] = group

        return roster_groups

    def _get_accounts(self) -> dict[str | None, str]:
        accounts: dict[str | None, str] = {None: _("All")}
        for acc, label in app.get_enabled_accounts_with_labels():
            accounts[acc] = label
        return accounts
