import dataclasses
import datetime
import json
import os
import pathlib
import ssl
import subprocess
import sys
import typing
import urllib.parse
import urllib.request

# official api documentation:
# https://github.com/ToontownRewritten/api-doc/blob/master/login.md
# https://github.com/ToontownRewritten/api-doc/blob/master/invasions.md

_LOGIN_API_URL = "https://www.toontownrewritten.com/api/login?format=json"


def start_engine(
    engine_path: pathlib.Path, gameserver: str, playcookie: str, **popen_kwargs
) -> subprocess.Popen:
    # without XAUTHORITY:
    # > :display:x11display(error): Could not open display ":0.0".
    # > :ToonBase: Default graphics pipe is glxGraphicsPipe (OpenGL).
    # > :ToonBase(warning): Unable to open 'onscreen' window.
    # > Traceback (most recent call last):
    # >   File "<compiled '__voltorbmain__'>", line 0, in <module>
    # >   [...]
    # >   File "<compiled 'direct.vlt8f63e471.ShowBase'>", line 0, in vltf05fd21b
    # > Exception: Could not open window.
    # optirun sets plenty of env vars
    env = os.environ.copy()
    env["TTR_GAMESERVER"] = gameserver
    env["TTR_PLAYCOOKIE"] = playcookie
    # .resolve(strict=True/False) is not available in python3.5
    engine_path = engine_path.resolve()
    if sys.platform == "darwin":
        env["DYLD_LIBRARY_PATH"] = str(engine_path.parent.joinpath("Libraries.bundle"))
        env["DYLD_FRAMEWORK_PATH"] = str(engine_path.parent.joinpath("Frameworks"))
    return subprocess.Popen(
        args=[str(engine_path)],
        cwd=str(engine_path.parent),  # str conversion for compatibility with python3.5
        env=env,
        **popen_kwargs,
    )


def _api_request(
    *, url: str, params: typing.Optional[dict] = None, validate_ssl_cert: bool = True
):
    request = urllib.request.Request(
        url=url,
        data=urllib.parse.urlencode(params).encode("ascii") if params else None,
        headers={"User-Agent": "tooncher"},
    )
    if validate_ssl_cert is False:  # explicit check to avoid catching None
        # > To revert to [...] unverified behavior ssl._create_unverified_context()
        # > can be passed to the context parameter.
        # https://docs.python.org/3.8/library/http.client.html
        ssl_context: typing.Optional[ssl.SSLContext] = (
            # pylint: disable=protected-access; recommended in python docs
            ssl._create_unverified_context()
        )
    else:
        ssl_context = None
    with urllib.request.urlopen(request, context=ssl_context) as response:
        return json.loads(response.read().decode("ascii"))


@dataclasses.dataclass
class _LoginSuccessful:
    playcookie: str
    gameserver: str


@dataclasses.dataclass
class _LoginDelayed:
    queue_token: str


def _login(
    *,
    username: typing.Optional[str] = None,
    password: typing.Optional[str] = None,
    queue_token: typing.Optional[str] = None,
    validate_ssl_cert: bool = True,
) -> typing.Union[_LoginSuccessful, _LoginDelayed]:
    if username is not None and queue_token is None:
        assert password is not None
        req_params = {
            "username": username,
            "password": password,
        }
    elif username is None and queue_token is not None:
        req_params = {
            "queueToken": queue_token,
        }
    else:
        raise Exception("either specify username or queue token")
    resp_data = _api_request(
        url=_LOGIN_API_URL,
        params=req_params,
        validate_ssl_cert=validate_ssl_cert,
    )
    if resp_data["success"] == "true":
        return _LoginSuccessful(
            playcookie=resp_data["cookie"],
            gameserver=resp_data["gameserver"],
        )
    if resp_data["success"] == "delayed":
        return _LoginDelayed(queue_token=resp_data["queueToken"])
    raise Exception(repr(resp_data))


def launch(
    engine_path: pathlib.Path,
    username: str,
    password: str,
    validate_ssl_certs: bool = True,
    cpu_limit_percent: typing.Optional[int] = None,
) -> None:
    result = _login(
        username=username,
        password=password,
        validate_ssl_cert=validate_ssl_certs,
    )
    if isinstance(result, _LoginDelayed):
        result = _login(
            queue_token=result.queue_token,
            validate_ssl_cert=validate_ssl_certs,
        )
    if not isinstance(result, _LoginSuccessful):
        raise Exception(f"unexpected response: {result!r}")
    process = start_engine(
        engine_path=engine_path,
        gameserver=result.gameserver,
        playcookie=result.playcookie,
    )
    if cpu_limit_percent is not None:
        subprocess.run(
            args=[
                "cpulimit",
                "--pid",
                str(process.pid),
                "--limit",
                str(cpu_limit_percent),
                # '--verbose',
            ],
            check=True,
        )
    process.wait()