"""The legacy /discord/* routes.

These are not duplicate coverage of tests/accounts/test_oauth.py — they pin the two
compatibility promises that outlive the refactor:

* **/discord/link/callback is registered in Discord's developer portal.** If it
  stops answering, every Discord login breaks until an operator edits the portal.
* The other /discord/* paths are what the deployed frontend calls, and frontend and
  backend deploy independently, so a newer backend must keep serving an older one.

The flow itself lives in accounts/oauth.py and is tested there.
"""
import pytest
from fastapi.testclient import TestClient

from web import app as appmod
from accounts import db, oauth

V2 = "/thermograph/api/v2"
PW = "supersecret123"


@pytest.fixture(scope="module", autouse=True)
def _tables():
    db.Base.metadata.create_all(db.sync_engine)


@pytest.fixture(autouse=True)
def _configured(monkeypatch):
    monkeypatch.setitem(oauth.CREDENTIALS, "discord", ("app123", "secret456"))
    monkeypatch.setattr(oauth.httpx, "AsyncClient", _MockClient)


class _Resp:
    def __init__(self, code, data): self.status_code = code; self._data = data
    def json(self): return self._data


class _MockClient:
    def __init__(self, *a, **k): pass
    async def __aenter__(self): return self
    async def __aexit__(self, *a): return False
    async def post(self, url, **k): return _Resp(200, {"access_token": "tok"})
    async def get(self, url, **k):
        return _Resp(200, {"id": "discord-999", "email": "legacy@example.com",
                           "verified": True})


def _login(client, email):
    assert client.post(f"{V2}/auth/register",
                       json={"email": email, "password": PW}).status_code in (201, 400)
    assert client.post(f"{V2}/auth/login",
                       data={"username": email, "password": PW}).status_code == 204


def test_legacy_config_still_reports_enabled_state(monkeypatch):
    c = TestClient(appmod.app)
    monkeypatch.setitem(oauth.CREDENTIALS, "discord", ("", ""))
    assert c.get(f"{V2}/discord/config").json() == {"enabled": False}
    monkeypatch.setitem(oauth.CREDENTIALS, "discord", ("app123", "secret456"))
    assert c.get(f"{V2}/discord/config").json() == {"enabled": True}


def test_legacy_link_start_still_requires_auth():
    c = TestClient(appmod.app)
    assert c.get(f"{V2}/discord/link/start", follow_redirects=False).status_code == 401
    assert c.post(f"{V2}/discord/unlink").status_code == 401


def test_legacy_start_redirects_to_discord():
    c = TestClient(appmod.app)
    _login(c, "legacy-start@example.com")
    r = c.get(f"{V2}/discord/link/start", follow_redirects=False)
    assert r.status_code == 303
    loc = r.headers["location"]
    assert loc.startswith("https://discord.com/api/oauth2/authorize")
    assert "client_id=app123" in loc and "scope=identify" in loc and "state=" in loc
    # The redirect_uri it asks Discord to call back on must be the registered one.
    assert "discord%2Flink%2Fcallback" in loc


def test_the_registered_callback_url_still_completes_a_link():
    c = TestClient(appmod.app)
    _login(c, "legacy-cb@example.com")
    uid = c.get(f"{V2}/users/me").json()["id"]
    state = oauth._sign_state(uid, "link", "discord")
    r = c.get(f"{V2}/discord/link/callback?code=abc&state={state}",
              follow_redirects=False)
    assert r.status_code == 303 and "discord=linked" in r.headers["location"]
    me = c.get(f"{V2}/users/me").json()
    assert me["discord_id"] == "discord-999"          # the DM delivery address
    assert me["oauth_providers"] == ["discord"]       # and the identity row
    # Legacy unlink clears both.
    assert c.post(f"{V2}/discord/unlink").status_code == 204
    me = c.get(f"{V2}/users/me").json()
    assert me["discord_id"] is None and me["oauth_providers"] == []


def test_the_callback_still_emits_the_discord_query_param():
    """The deployed frontend reads ?discord=<status>, not ?oauth=. Dropping it would
    silently stop it showing any outcome at all."""
    c = TestClient(appmod.app)
    r = c.get(f"{V2}/discord/link/callback?error=access_denied", follow_redirects=False)
    loc = r.headers["location"]
    assert "discord=cancelled" in loc and "oauth=cancelled" in loc


def test_users_me_still_carries_the_deprecated_discord_only_field(monkeypatch):
    """Renamed to oauth_only, but the deployed frontend still reads the old name."""
    monkeypatch.setattr(oauth.httpx, "AsyncClient", _MockClient)
    c = TestClient(appmod.app)
    r = c.get(f"{V2}/discord/link/callback?code=abc"
              f"&state={oauth._sign_state(None, 'login', 'discord')}",
              follow_redirects=False)
    assert "discord=created" in r.headers["location"]
    me = c.get(f"{V2}/users/me").json()
    assert me["oauth_only"] is True and me["discord_only"] is True


def test_legacy_login_start_is_still_mounted():
    c = TestClient(appmod.app)
    r = c.get(f"{V2}/discord/login/start", follow_redirects=False)
    assert r.status_code == 303
    assert r.headers["location"].startswith("https://discord.com/api/oauth2/authorize")