# desktop_source.py
#
# Copyright 2022-2023 kramo
#
# 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 <http://www.gnu.org/licenses/>.
#
# SPDX-License-Identifier: GPL-3.0-or-later

import shlex
from hashlib import sha3_256
from pathlib import Path
from time import time
from typing import NamedTuple

from gi.repository import GLib, Gtk

from src import shared
from src.game import Game
from src.importer.sources.source import ExecutableFormatSource, SourceIterable


class DesktopSourceIterable(SourceIterable):
    source: "DesktopSource"

    def __iter__(self):
        """Generator method producing games"""

        added_time = int(time())

        icon_theme = Gtk.IconTheme.new()

        search_paths = GLib.get_system_data_dirs() + [
            "/run/host/usr/share",
            "/run/host/usr/local/share",
            shared.home / ".local" / "share",
        ]

        for search_path in search_paths:
            if not (path := Path(search_path) / "icons").exists():
                continue

            if str(path).startswith("/app/"):
                continue

            icon_theme.add_search_path(str(path))

        match shared.schema.get_enum("desktop-terminal"):
            case 0:
                terminal_exec = shared.schema.get_string("desktop-terminal-custom-exec")
            case 1:
                terminal_exec = "xdg-terminal-exec"
            case 2:
                terminal_exec = "kgx -e"
            case 3:
                terminal_exec = "gnome-terminal --"
            case 4:
                terminal_exec = "konsole -e"
            case 5:
                terminal_exec = "xterm -e"
        terminal_exec += " "

        for path in search_paths:
            if str(path).startswith("/app/"):
                continue

            path = Path(path) / "applications"

            if not path.is_dir():
                continue

            for entry in path.iterdir():
                if entry.suffix != ".desktop":
                    continue

                keyfile = GLib.KeyFile.new()

                try:
                    keyfile.load_from_file(str(entry), 0)

                    if "Game" not in keyfile.get_string_list(
                        "Desktop Entry", "Categories"
                    ):
                        continue

                    name = keyfile.get_string("Desktop Entry", "Name")
                    executable = keyfile.get_string("Desktop Entry", "Exec")
                except GLib.GError:
                    continue

                try:
                    terminal = keyfile.get_boolean("Desktop Entry", "Terminal")
                except GLib.GError:
                    terminal = False

                try:
                    cd_path = (
                        "cd " + keyfile.get_string("Desktop Entry", "Path") + " && "
                    )
                except GLib.GError:
                    cd_path = ""

                values = {
                    "source": self.source.source_id,
                    "added": added_time,
                    "name": name,
                    "game_id": "desktop_"
                    + sha3_256(
                        str(path).encode("utf-8"), usedforsecurity=False
                    ).hexdigest(),
                    "executable": self.source.executable_format.format(
                        exec=cd_path
                        + (
                            (terminal_exec + shlex.quote(executable))
                            if terminal
                            else executable
                        )
                    ),
                }
                game = Game(values)

                additional_data = {}

                try:
                    if (
                        icon_path := icon_theme.lookup_icon(
                            keyfile.get_string("Desktop Entry", "Icon"),
                            None,
                            512,
                            1,
                            shared.win.get_direction(),
                            0,
                        )
                        .get_file()
                        .get_path()
                    ):
                        additional_data = {"local_icon_path": Path(icon_path)}
                    else:
                        pass
                except GLib.GError:
                    pass

                yield (game, additional_data)


class DesktopLocations(NamedTuple):
    pass


class DesktopSource(ExecutableFormatSource):
    """Generic Flatpak source"""

    source_id = "desktop"
    name = _("Desktop")
    iterable_class = DesktopSourceIterable
    executable_format = "{exec}"
    available_on = {"linux"}

    locations: DesktopLocations

    def __init__(self) -> None:
        super().__init__()
        self.locations = DesktopLocations()