"""The long run turns the memory bank and the rolling summary on, and proves it.

M01's step list asks for "summary/memory activation". Both are per-campaign
switches that default to off (`models.Adventure`), and the harness that ran the
first complete hundred-turn campaign never touched them: the bank stayed empty,
no summary was written, and M04's recall succeeded through narrative state alone.
Nothing in that run's evidence said so except a row of zeros nobody was looking
for.

These tests drive `Run.setup` against the real application in-process, so the
switch is proved by the application accepting it rather than by the harness
sending it. What they cannot prove is that a hundred turns then fill the bank —
that is what the run itself proves, and `memories_in_bank` in its timeline is
where it shows.
"""
import pytest
from fastapi import Depends
from fastapi.testclient import TestClient

from app import auth, models
from app.database import Base, SessionLocal, engine, get_db
from app.main import app
from tools import m11_long_run as lr


UNREACHABLE = "http://127.0.0.1:1/v1"


class InProcess:
    """`Storyteller.call`, spoken to the application through the test client."""

    starts = 1

    def __init__(self, client: TestClient):
        self.client = client

    def call(self, method, path, payload=None, timeout=600):
        response = self.client.request(method, f"/api{path}", json=payload)
        response.raise_for_status()
        return response.json() if response.content else None


class IgnoresThePatch:
    """A server that answers the PATCH and changes nothing, which is exactly the
    failure `setup` must refuse rather than record."""

    starts = 1

    def __init__(self):
        self.calls = []

    def call(self, method, path, payload=None, timeout=600):
        self.calls.append((method, path))
        if path == "/settings":
            return {"model": "m", "context_token_budget": 16384,
                    "model_timeout_seconds": 1800}
        if method == "POST" and path == "/adventures":
            return {"id": 1}
        if method == "GET" and path == "/adventures/1":
            return {"memory_bank_enabled": False, "auto_summarize": False}
        return {}


@pytest.fixture()
def client(monkeypatch):
    monkeypatch.setattr(lr, "ENDPOINT", UNREACHABLE)
    monkeypatch.setattr(lr, "MODEL", "some-model")
    monkeypatch.setattr(lr, "EMBED_MODEL", "some-embedder")
    Base.metadata.create_all(bind=engine)
    setup = SessionLocal()
    user = models.User(is_guest=False, email="m11mem@example.com")
    setup.add(user)
    setup.commit()
    user_id = user.id
    setup.close()

    app.dependency_overrides[auth.get_current_user] = (
        lambda db=Depends(get_db): db.get(models.User, user_id)
    )
    try:
        yield TestClient(app)
    finally:
        app.dependency_overrides.clear()
        Base.metadata.drop_all(bind=engine)


@pytest.fixture()
def run_for(tmp_path, monkeypatch):
    """A `Run` on the given server. Uploads are skipped: `upload` builds its own
    multipart request to a port, and the knowledge library is not what these
    tests are about."""
    made = []

    def make(server):
        run = lr.Run(server, tmp_path, turns_target=100)
        monkeypatch.setattr(run, "upload", lambda *a, **k: None)
        made.append(run)
        return run

    yield make
    for run in made:
        run.timeline.close()


def test_a_fresh_campaign_starts_with_both_switches_off(client):
    """The premise. If this ever changes, the harness's PATCH is redundant but
    harmless; while it holds, a harness without the PATCH measures nothing."""
    created = client.post("/api/adventures", json={"title": "untouched"}).json()
    assert created["memory_bank_enabled"] is False
    assert created["auto_summarize"] is False


def test_setup_leaves_the_campaign_with_memory_and_summary_on(client, run_for):
    run = run_for(InProcess(client))
    run.setup()

    stored = client.get(f"/api/adventures/{run.adv}").json()
    assert stored["memory_bank_enabled"] is True
    assert stored["auto_summarize"] is True

    activated = [e for e in run.events if e["kind"] == "memory_activated"]
    assert len(activated) == 1
    assert activated[0]["memory_bank_enabled"] is True
    assert activated[0]["auto_summarize"] is True


def test_setup_refuses_a_campaign_that_did_not_take_the_switches(run_for):
    """Hours of turns against a campaign with the bank off is the run that was
    already had. It must stop before the first one, not report silence after."""
    server = IgnoresThePatch()
    run = run_for(server)

    with pytest.raises(SystemExit, match="summary/memory clause"):
        run.setup()

    # It asked, it read back, and it went no further.
    assert ("PATCH", "/adventures/1") in server.calls
    assert not any("/state/corrections" in path for _, path in server.calls)
    recorded = [e for e in run.events if e["kind"] == "memory_activated"]
    assert recorded and recorded[0]["memory_bank_enabled"] is False


def test_a_run_without_an_embedding_model_is_refused(monkeypatch, tmp_path, capsys):
    """With the bank on and no embedder, memories are written and never
    retrieved: `memorybank.retrieve` answers "No embedding model configured".
    That is the same unexercised path in a fuller bank, so it is refused before
    a server is started or a directory is claimed."""
    monkeypatch.setattr(lr, "ENDPOINT", UNREACHABLE)
    monkeypatch.setattr(lr, "MODEL", "some-model")
    monkeypatch.setattr(lr, "EMBED_MODEL", "")
    out = tmp_path / "never-made"
    monkeypatch.setattr("sys.argv", ["m11_long_run", "--out", str(out)])

    assert lr.main() == 2
    assert "AIDND_TEST_EMBED_MODEL" in capsys.readouterr().out
    assert not out.exists()


def test_the_bank_is_counted_from_the_application(client, run_for):
    run = run_for(InProcess(client))
    run.setup()
    assert run.bank_size() == 0

    db = SessionLocal()
    try:
        db.add(models.Memory(adventure_id=run.adv, text="the key opens the crypt"))
        db.commit()
    finally:
        db.close()
    assert run.bank_size() == 1


def test_a_count_that_cannot_be_read_is_minus_one_not_an_exception(run_for):
    """Measurement never fails a turn; -1 is distinguishable from an empty bank."""

    class Down:
        starts = 1

        def call(self, *a, **k):
            raise ConnectionError("gone")

    run = run_for(Down())
    run.adv = 7
    assert run.bank_size() == -1