"""EVE SSO auth: PKCE, JWT claims, token store, exchange/refresh, get_auth."""

import asyncio
import base64
import hashlib

import httpx
import pytest

from conftest import make_jwt
from familiar import auth


@pytest.fixture
def tmp_store(tmp_path, monkeypatch):
    """Point the token/key files at a temp dir."""
    monkeypatch.setenv("FAMILIAR_DATA_DIR", str(tmp_path))
    return tmp_path


def test_generate_pkce_challenge_matches_verifier():
    verifier, challenge = auth.generate_pkce()
    expected = (
        base64.urlsafe_b64encode(hashlib.sha256(verifier.encode()).digest()).rstrip(b"=").decode()
    )
    assert challenge == expected
    assert "=" not in challenge


def test_build_authorize_url_has_required_params():
    url = auth.build_authorize_url("the-state", "the-challenge")
    assert "response_type=code" in url
    assert "code_challenge=the-challenge" in url
    assert "code_challenge_method=S256" in url
    assert "state=the-state" in url
    assert "client_id=" in url


def test_decode_jwt_and_character_id():
    token = make_jwt({"sub": "CHARACTER:EVE:2112000001", "name": "Latte", "scp": ["a"]})
    claims = auth.decode_jwt_claims(token)
    assert claims["name"] == "Latte"
    assert auth.character_id_from_claims(claims) == 2112000001


def test_character_id_from_bad_sub_raises():
    with pytest.raises(auth.AuthError):
        auth.character_id_from_claims({"sub": "nonsense"})


def test_decode_malformed_token_raises():
    with pytest.raises(auth.AuthError):
        auth.decode_jwt_claims("not-a-jwt")


def test_token_store_round_trip(tmp_store):
    bundle = {"refresh_token": "r", "character_id": 7, "character_name": "X"}
    assert auth.load_tokens() is None
    auth.save_tokens(bundle)
    assert auth.load_tokens() == bundle
    assert (tmp_store / "token.enc").exists()
    assert auth.clear_tokens() is True
    assert auth.load_tokens() is None
    assert auth.clear_tokens() is False


def test_stored_token_is_encrypted_not_plaintext(tmp_store):
    auth.save_tokens({"refresh_token": "super-secret-value", "character_id": 1})
    raw = (tmp_store / "token.enc").read_bytes()
    assert b"super-secret-value" not in raw


def _token_transport(payload):
    return httpx.MockTransport(lambda req: httpx.Response(200, json=payload))


def test_exchange_code_posts_and_parses():
    payload = {"access_token": "a", "refresh_token": "r", "expires_in": 1200}
    out = asyncio.run(auth.exchange_code("code", "verifier", transport=_token_transport(payload)))
    assert out["refresh_token"] == "r"


def test_token_request_raises_on_error():
    transport = httpx.MockTransport(lambda req: httpx.Response(400, text="bad_request"))
    with pytest.raises(auth.AuthError):
        asyncio.run(auth.refresh_tokens("r", transport=transport))


def test_get_auth_without_login_raises(tmp_store):
    with pytest.raises(auth.NotAuthenticated):
        asyncio.run(auth.get_auth())


def test_get_auth_uses_unexpired_token(tmp_store):
    auth.save_tokens(
        {
            "access_token": "still-good",
            "refresh_token": "r",
            "character_id": 9,
            "expires_at": 10_000,
        }
    )
    token, cid = asyncio.run(auth.get_auth(now=5_000))
    assert token == "still-good"
    assert cid == 9


def test_get_auth_refreshes_when_expired(tmp_store):
    auth.save_tokens(
        {"access_token": "old", "refresh_token": "r0", "character_id": 9, "expires_at": 1_000}
    )
    new_access = make_jwt({"sub": "CHARACTER:EVE:9", "name": "Latte"})
    payload = {"access_token": new_access, "refresh_token": "r1", "expires_in": 1200}
    token, cid = asyncio.run(auth.get_auth(now=2_000, transport=_token_transport(payload)))
    assert token == new_access
    assert cid == 9
    # The rotated refresh token is persisted.
    assert auth.load_tokens()["refresh_token"] == "r1"


def test_status_reflects_store(tmp_store):
    assert auth.status() == {"authenticated": False}
    auth.save_tokens({"refresh_token": "r", "character_id": 3, "character_name": "Y", "scopes": []})
    info = auth.status()
    assert info["authenticated"] is True
    assert info["character_id"] == 3