# steam_source.py
#
# Copyright 2022-2023 kramo
# Copyright 2023 Geoffrey Coulaud
#
# 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 logging
import re
from pathlib import Path
from typing import Iterable, NamedTuple

from src import shared
from src.game import Game
from src.importer.sources.location import Location, LocationSubPath
from src.importer.sources.source import SourceIterable, URLExecutableSource
from src.utils.steam import SteamFileHelper, SteamInvalidManifestError


class SteamSourceIterable(SourceIterable):
    source: "SteamSource"

    def get_manifest_dirs(self) -> Iterable[Path]:
        """Get dirs that contain Steam app manifests"""
        libraryfolders_path = self.source.locations.data["libraryfolders.vdf"]
        with open(libraryfolders_path, "r", encoding="utf-8") as file:
            contents = file.read()
        return [
            Path(path) / "steamapps"
            for path in re.findall('"path"\\s+"(.*)"\n', contents, re.IGNORECASE)
        ]

    def get_manifests(self) -> Iterable[Path]:
        """Get app manifests"""
        manifests = set()
        for steamapps_dir in self.get_manifest_dirs():
            if not steamapps_dir.is_dir():
                continue
            manifests.update(
                [
                    manifest
                    for manifest in steamapps_dir.glob("appmanifest_*.acf")
                    if manifest.is_file()
                ]
            )
        return manifests

    def __iter__(self):
        """Generator method producing games"""
        appid_cache = set()
        manifests = self.get_manifests()

        for manifest in manifests:
            # Get metadata from manifest
            steam = SteamFileHelper()
            try:
                local_data = steam.get_manifest_data(manifest)
            except (OSError, SteamInvalidManifestError) as error:
                logging.debug("Couldn't load appmanifest %s", manifest, exc_info=error)
                continue

            # Skip non installed games
            installed_mask = 4
            if not int(local_data["stateflags"]) & installed_mask:
                logging.debug("Skipped %s: not installed", manifest)
                continue

            # Skip duplicate appids
            appid = local_data["appid"]
            if appid in appid_cache:
                logging.debug("Skipped %s: appid already seen during import", manifest)
                continue
            appid_cache.add(appid)

            # Build game from local data
            values = {
                "added": shared.import_time,
                "name": local_data["name"],
                "source": self.source.source_id,
                "game_id": self.source.game_id_format.format(game_id=appid),
                "executable": self.source.make_executable(game_id=appid),
            }
            game = Game(values)

            # Add official cover image
            image_path = (
                self.source.locations.data["librarycache"]
                / f"{appid}_library_600x900.jpg"
            )
            additional_data = {"local_image_path": image_path, "steam_appid": appid}

            yield (game, additional_data)


class SteamLocations(NamedTuple):
    data: Location


class SteamSource(URLExecutableSource):
    source_id = "steam"
    name = _("Steam")
    available_on = {"linux", "win32"}
    iterable_class = SteamSourceIterable
    url_format = "steam://rungameid/{game_id}"

    locations: SteamLocations

    def __init__(self) -> None:
        super().__init__()
        self.locations = SteamLocations(
            Location(
                schema_key="steam-location",
                candidates=(
                    shared.home / ".steam" / "steam",
                    shared.data_dir / "Steam",
                    shared.flatpak_dir / "com.valvesoftware.Steam" / "data" / "Steam",
                    shared.programfiles32_dir / "Steam",
                ),
                paths={
                    "libraryfolders.vdf": LocationSubPath(
                        "steamapps/libraryfolders.vdf"
                    ),
                    "librarycache": LocationSubPath("appcache/librarycache", True),
                },
                invalid_subtitle=Location.DATA_INVALID_SUBTITLE,
            )
        )