"""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 json

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


# ----------------------------------------------- failed post-turn work stops a run

class Reports:
    """A server whose derived status, summaries and log say what the test sets."""

    starts = 1

    def __init__(self, log_path, *, status=None, summaries=0, memories=0):
        self.log_path = log_path
        self.status = status or []
        self.summaries = summaries
        self.memories = memories

    def call(self, method, path, payload=None, timeout=600):
        if path.endswith("/derived"):
            return {"status": self.status,
                    "failing": [r["kind"] for r in self.status if r["status"] == "failed"],
                    "summaries": [{"id": i} for i in range(self.summaries)]}
        if path.endswith("/memories"):
            return [{"id": i} for i in range(self.memories)]
        return {}


def test_a_failed_pass_in_derived_status_stops_the_run(run_for, tmp_path):
    server = Reports(tmp_path / "server.log", status=[
        {"kind": "summary", "status": "failed", "detail": "ProviderError: gone"},
        {"kind": "memory", "status": "idle", "detail": ""},
    ])
    run = run_for(server)
    run.adv = 1
    found = run.background_failures()
    assert found == ["summary: ProviderError: gone"]


def test_a_failure_the_application_could_not_record_is_found_in_the_log_once(run_for, tmp_path):
    """The failure that hid the first GPU trial: derived status said `idle` and
    the only record was in the server log."""
    log = tmp_path / "server.log"
    log.write_text("INFO: 200 OK\nERROR:app.memorybank:could not record derived-work failure for 1\n")
    run = run_for(Reports(log))
    run.adv = 1

    assert len(run.background_failures()) == 1
    assert run.background_failures() == [], "the same line was reported twice"

    with log.open("a") as handle:
        handle.write("ERROR:app.derived:derived summary work failed for adventure 1\n")
    assert len(run.background_failures()) == 1


def test_healthy_status_and_a_quiet_log_find_nothing(run_for, tmp_path):
    log = tmp_path / "server.log"
    log.write_text('INFO: "POST /api/adventures/1/actions HTTP/1.1" 200 OK\n')
    run = run_for(Reports(log, status=[{"kind": "memory", "status": "ok", "detail": ""}]))
    run.adv = 1
    assert run.background_failures() == []


def test_the_log_position_survives_a_resume(run_for, tmp_path):
    """Otherwise a resumed run would find the failure that stopped it again, and
    stop again, however healthy the application now is."""
    first = run_for(Reports(tmp_path / "server.log"))
    first.adv, first.log_offset = 1, 4096
    first.save_resume()

    second = run_for(Reports(tmp_path / "server.log"))
    second.adopt(json.loads((tmp_path / lr.RESUME_FILE).read_text()))
    assert second.log_offset == 4096


def test_a_run_with_no_summary_or_no_memory_is_not_complete(run_for, tmp_path):
    log = tmp_path / "server.log"
    assert "summaries=0" in lr._activation_shortfall(
        _with_adv(run_for(Reports(log, memories=3, summaries=0))))
    assert "memories_in_bank=0" in lr._activation_shortfall(
        _with_adv(run_for(Reports(log, memories=0, summaries=2))))
    assert lr._activation_shortfall(
        _with_adv(run_for(Reports(log, memories=3, summaries=1)))) is None


def _with_adv(run):
    run.adv = 1
    return run