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import re
from pathlib import Path
from typing import Dict, Optional, Tuple
from .base_service import BaseService
from .constants import STEAM_LOSSLESS_SCALING_APP_ID, STEAM_LOSSLESS_SCALING_BRANCH
class SteamService(BaseService):
DEFAULT_BRANCH = "public"
MANIFEST_FILENAME = f"appmanifest_{STEAM_LOSSLESS_SCALING_APP_ID}.acf"
def _steam_library_roots(self):
candidates = (
self.user_home / ".local/share/Steam",
self.user_home / ".steam/steam",
self.user_home / ".steam/root",
self.user_home / ".var/app/com.valvesoftware.Steam/.local/share/Steam",
)
seen = set()
for candidate in candidates:
yield from self._unique_existing_root(candidate, seen)
library_file = candidate / "steamapps/libraryfolders.vdf"
try:
content = library_file.read_text(encoding="utf-8")
except OSError:
continue
for raw_path in re.findall(r'(?m)^\s*"path"\s+"((?:\\.|[^"])*)"', content):
path = raw_path.replace(r'\"', '"').replace(r'\\', '\\')
yield from self._unique_existing_root(Path(path), seen)
@staticmethod
def _unique_existing_root(path: Path, seen: set[str]):
if not path.exists():
return
try:
resolved = str(path.resolve())
except OSError:
resolved = str(path)
if resolved in seen:
return
seen.add(resolved)
yield path
def _manifest_path(self) -> Optional[Path]:
for library_root in self._steam_library_roots():
manifest = library_root / "steamapps" / self.MANIFEST_FILENAME
if manifest.is_file():
return manifest
return None
@staticmethod
def _section_bounds(content: str, section_name: str) -> Optional[Tuple[int, int, str]]:
section = re.search(
rf'(?m)^(?P<indent>[ \t]*)"{re.escape(section_name)}"[ \t\r\n]*\{{',
content,
)
if section is None:
return None
depth = 1
in_string = False
escaped = False
for index in range(section.end(), len(content)):
character = content[index]
if in_string:
if escaped:
escaped = False
elif character == "\\":
escaped = True
elif character == '"':
in_string = False
continue
if character == '"':
in_string = True
elif character == "{":
depth += 1
elif character == "}":
depth -= 1
if depth == 0:
return section.end(), index, section.group("indent")
return None
@classmethod
def _section_value(cls, content: str, section_name: str, key: str) -> Optional[str]:
bounds = cls._section_bounds(content, section_name)
if bounds is None:
return None
body_start, body_end, _ = bounds
pattern = re.compile(
r'(?m)^[ \t]*"(?P<key>[^"]+)"[ \t]+"(?P<value>(?:\\.|[^"\\])*)"'
)
for match in pattern.finditer(content, body_start, body_end):
if match.group("key") == key:
return match.group("value")
return None
@classmethod
def _branch_or_default(cls, branch: Optional[str]) -> str:
return branch or cls.DEFAULT_BRANCH
def _status_fields(self, manifest_path: Path, content: str) -> Dict[str, object]:
selected_branch = self._branch_or_default(
self._section_value(content, "UserConfig", "BetaKey")
)
current_branch = self._branch_or_default(
self._section_value(content, "MountedConfig", "BetaKey")
or self._section_value(content, "UserConfig", "BetaKey")
)
needs_switch = (
selected_branch != STEAM_LOSSLESS_SCALING_BRANCH
or current_branch != STEAM_LOSSLESS_SCALING_BRANCH
)
return {
"installed": True,
"manifest_path": str(manifest_path),
"selected_branch": selected_branch,
"current_branch": current_branch,
"target_branch": STEAM_LOSSLESS_SCALING_BRANCH,
"needs_switch": needs_switch,
"restart_required": (
selected_branch == STEAM_LOSSLESS_SCALING_BRANCH
and current_branch != STEAM_LOSSLESS_SCALING_BRANCH
),
}
def find_lsfg_vk_dll(self) -> Optional[str]:
"""Find the branch-specific upstream DLL in any Steam library."""
if self.get_branch_status().get("needs_switch"):
return None
for library_root in self._steam_library_roots():
dll_path = library_root / "steamapps/common/Lossless Scaling/lsfg-vk.dll"
if dll_path.is_file():
return str(dll_path)
return None
def get_branch_status(self) -> Dict[str, object]:
try:
manifest_path = self._manifest_path()
if manifest_path is None:
return self._success_response(
dict,
"Lossless Scaling is not installed through Steam",
installed=False,
manifest_path=None,
selected_branch=None,
current_branch=None,
target_branch=STEAM_LOSSLESS_SCALING_BRANCH,
needs_switch=False,
restart_required=False,
)
content = manifest_path.read_text(encoding="utf-8")
fields = self._status_fields(manifest_path, content)
if not fields["needs_switch"]:
message = "Lossless Scaling is using the lsfg-vk Steam branch"
elif fields["restart_required"]:
message = "lsfg-vk is selected; restart Steam to finish the branch switch"
else:
message = "Lossless Scaling is not using the lsfg-vk Steam branch"
return self._success_response(dict, message, **fields)
except Exception as error:
return self._error_response(
dict,
str(error),
installed=False,
manifest_path=None,
selected_branch=None,
current_branch=None,
target_branch=STEAM_LOSSLESS_SCALING_BRANCH,
needs_switch=False,
restart_required=False,
)
def get_installed_games(self) -> Dict[str, object]:
"""Return installed Steam app IDs and names for the Game Mode selector."""
try:
games = {}
for library_root in self._steam_library_roots():
for manifest in (library_root / "steamapps").glob("appmanifest_*.acf"):
match = re.fullmatch(r"appmanifest_(\d+)\.acf", manifest.name)
if not match:
continue
try:
content = manifest.read_text(encoding="utf-8")
except OSError:
continue
appid = match.group(1)
name = self._section_value(content, "AppState", "name") or f"App {appid}"
games[appid] = name
return self._success_response(dict, games=[{"appid": appid, "name": name} for appid, name in sorted(games.items(), key=lambda item: item[1].lower())])
except Exception as error:
return self._error_response(dict, str(error), games=[])
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