# -*- encoding: utf-8 -*-
from __future__ import annotations

import itertools
import json
import os
import sys
import winreg
from collections.abc import Iterable
from pathlib import Path


def find_epic_games() -> Iterable[tuple[str, Path]]:
    try:
        with winreg.OpenKey(
            winreg.HKEY_LOCAL_MACHINE,
            r"Software\Wow6432Node\Epic Games\EpicGamesLauncher",
        ) as key:
            epic_app_data_path, _ = winreg.QueryValueEx(key, "AppDataPath")
    except FileNotFoundError:
        return

    manifests_path = Path(os.path.expandvars(epic_app_data_path)).joinpath("Manifests")
    if manifests_path.exists():
        for manifest_file_path in manifests_path.glob("*.item"):
            try:
                with open(manifest_file_path, encoding="utf-8") as manifest_file:
                    manifest_file_data = json.load(manifest_file)
                yield (
                    manifest_file_data["AppName"],
                    Path(manifest_file_data["InstallLocation"]),
                )
            except (json.JSONDecodeError, KeyError):
                print(
                    "Unable to parse Epic Games manifest file",
                    manifest_file_path,
                    file=sys.stderr,
                )


def find_legendary_games() -> Iterable[tuple[str, Path]]:
    # Based on legendary source:
    # https://github.com/derrod/legendary/blob/master/legendary/lfs/lgndry.py
    if config_path := os.environ.get("XDG_CONFIG_HOME"):
        legendary_config_path = Path(config_path, "legendary")
    else:
        legendary_config_path = Path("~/.config/legendary").expanduser()

    installed_path = legendary_config_path / "installed.json"
    if installed_path.exists():
        try:
            with open(installed_path, encoding="utf-8") as installed_file:
                installed_games = json.load(installed_file)
            for game in installed_games.values():
                yield game["app_name"], Path(game["install_path"])
        except (json.JSONDecodeError, AttributeError, KeyError):
            print(
                "Unable to parse installed games from Legendary",
                installed_path,
                file=sys.stderr,
            )


def find_games() -> dict[str, Path]:
    return dict(itertools.chain(find_epic_games(), find_legendary_games()))


if __name__ == "__main__":
    games = find_games()
    for k, v in games.items():
        print("Found game with id {} at {}.".format(k, v))