import re
import appdirs
from pathlib import Path
from configparser import ConfigParser

from worthless import constants
from worthless.launcher import Launcher


def _read_version_from_game_file(globalgamemanagers: Path):
    with globalgamemanagers.open("rb") as f:
        data = f.read().decode("ascii", errors="ignore")
    result = re.search(r"([1-9]+\.[0-9]+\.[0-9]+)_[\d]+_[\d]+", data)
    if not result:
        raise ValueError("Could not find version in game file")
    return result.group(1)


class Installer:
    def _read_version_from_config(self):
        if not self._config_file.exists():
            raise FileNotFoundError(f"Config file {self._config_file} not found")
        cfg = ConfigParser()
        cfg.read(str(self._config_file))
        return cfg.get("General", "game_version")

    # https://gitlab.com/KRypt0n_/an-anime-game-launcher/-/blob/main/src/ts/Game.ts#L26
    def get_game_version(self):
        if self._config_file.exists():
            return self._read_version_from_config()
        else:
            if self._overseas:
                globalgamemanagers = self._gamedir.joinpath("./GenshinImpact_Data/globalgamemanagers")
            else:
                globalgamemanagers = self._gamedir.joinpath("./YuanShen_Data/globalgamemanagers")
            if not globalgamemanagers.exists():
                return
            return _read_version_from_game_file(globalgamemanagers)

    def __init__(self, gamedir: str | Path = Path.cwd(), overseas: bool = True, data_dir: str | Path = None):
        if isinstance(gamedir, str):
            gamedir = Path(gamedir)
        self._gamedir = gamedir
        if not data_dir:
            self._appdirs = appdirs.AppDirs(constants.APP_NAME, constants.APP_AUTHOR)
            self._temp_path = Path(self._appdirs.user_cache_dir).joinpath("Installer")
        else:
            if not isinstance(data_dir, Path):
                data_dir = Path(data_dir)
            self._temp_path = data_dir.joinpath("Temp/Installer/")
        config_file = self._gamedir.joinpath("config.ini")
        self._config_file = config_file.resolve()
        self._version = None
        self._overseas = overseas
        self._launcher = Launcher(self._gamedir, overseas=self._overseas)
        self._version = self.get_game_version()

    async def get_game_diff_archive(self, from_version: str = None):
        """Gets a diff archive from `from_version` to the latest one

        If from_version is not specified, it will be taken from the game version.
        """
        if not from_version:
            if self._version:
                from_version = self._version
            else:
                from_version = self._version = self.get_game_version()
        if not from_version:
            raise ValueError("No game version found")
        game_resource = await self._launcher.get_resource_info()
        if not game_resource:
            raise ValueError("Could not fetch game resource")
        for v in game_resource.game.diffs:
            if v.version == from_version:
                return v