"""Phase 14 SP9 — editing the take you are actually reading.

The pager can park a turn on take 2 of 4. The transcript row it sits in is
still keyed by the *live* take, because that is the row the story tells and the
one the window carries; the take being read is only in the client's hand, by
its own node id.

So "edit this" has two ids to choose from, and the page shipped choosing the
wrong one: it opened the editor on the live take's text and saved over it, from
a row that was showing take 2. That is a client bug and it is fixed in
Play.jsx, but the fix rests on something only the server can promise —

  a take is an ordinary row to the edit endpoint, addressed by its own id,
  whether or not it is the one the path runs through

— and on the group listing telling the truth about it afterwards. Both are
asserted here so the client's fix cannot be quietly undermined.

    python -m pytest tests/test_take_edit.py -v
"""
import os
import tempfile

_tmp = tempfile.NamedTemporaryFile(suffix=".db", delete=False)
_tmp.close()
os.environ["AIDND_DB_PATH"] = _tmp.name
os.environ.pop("AIDND_DATABASE_URL", None)
os.environ.pop("DATABASE_URL", None)

import pytest
from fastapi import Depends
from fastapi.testclient import TestClient

from app import auth, limits, models
from app.database import Base, SessionLocal, engine, get_db
from app.main import app
from app.providers import PromptParts
from app.routers import adventures


class ScriptedProvider:
    last_usage = None
    replies: list = []
    calls = 0

    def __init__(self, *a, **k):
        pass

    async def generate(self, parts: PromptParts, *, temperature, max_tokens):
        index = min(ScriptedProvider.calls, len(ScriptedProvider.replies) - 1)
        ScriptedProvider.calls += 1
        yield ("text", ScriptedProvider.replies[index])


@pytest.fixture()
def client(monkeypatch):
    Base.metadata.create_all(bind=engine)
    setup = SessionLocal()
    user = models.User(is_guest=False, email="takeedit@example.com")
    setup.add(user)
    setup.flush()
    setup.add(models.Settings(user_id=user.id, api_key="enc:dummy", model="test-model"))
    scenario = models.Scenario(user_id=user.id, title="S")
    setup.add(scenario)
    setup.flush()
    adv = models.Adventure(
        user_id=user.id, title="Vault", scenario_id=scenario.id,
        script_state={}, world_state={},
    )
    setup.add(adv)
    setup.flush()
    setup.add(models.Action(adventure_id=adv.id, index=0, type="start", text="You begin."))
    setup.commit()
    adv_id, user_id = adv.id, user.id
    setup.close()

    ScriptedProvider.replies = [f"Take {n}." for n in range(1, 40)]
    ScriptedProvider.calls = 0
    monkeypatch.setattr(adventures, "OpenAICompatibleProvider", ScriptedProvider)
    monkeypatch.setattr(auth, "resolve_provider_config", lambda s: auth.ProviderConfig(
        "http://fake", "k", "test-model", False))
    monkeypatch.setattr(limits, "rate_limit", lambda *a, **k: None)
    monkeypatch.setattr(limits, "check_row_cap", lambda *a, **k: None)

    def _current_user(db=Depends(get_db)):
        return db.get(models.User, user_id)

    app.dependency_overrides[auth.get_current_user] = _current_user
    c = TestClient(app)
    c.adv_id = adv_id
    try:
        yield c
    finally:
        app.dependency_overrides.clear()
        adventures._active_turns.clear()
        Base.metadata.drop_all(bind=engine)


def _play(client, text="look around"):
    r = client.post(f"/api/adventures/{client.adv_id}/actions",
                    json={"type": "do", "text": text})
    assert r.status_code == 200, r.text


def _retry(client):
    r = client.post(f"/api/adventures/{client.adv_id}/retry")
    assert r.status_code == 200, r.text


def _takes(client, action_id):
    r = client.get(f"/api/adventures/{client.adv_id}/actions/{action_id}/variants")
    assert r.status_code == 200, r.text
    return r.json()


def _edit(client, action_id, text):
    return client.patch(f"/api/adventures/{client.adv_id}/actions/{action_id}",
                        json={"text": text})


def _live_ai(client):
    """The AI row the story currently tells, as the transcript reports it."""
    adv = client.get(f"/api/adventures/{client.adv_id}").json()
    return [a for a in adv["actions"] if a["type"] == "ai"][-1]


def _four_takes(client):
    """One turn, played four times. Returns (row the page holds, take list)."""
    _play(client)
    for _ in range(3):
        _retry(client)
    row = _live_ai(client)
    assert row["take_count"] == 4
    return row, _takes(client, row["id"])


def test_the_pager_reads_four_distinct_takes(client):
    """The premise: 2/4 and 4/4 are different rows with different words."""
    row, takes = _four_takes(client)
    assert [t["text"] for t in takes] == ["Take 1.", "Take 2.", "Take 3.", "Take 4."]
    assert takes[3]["id"] == row["id"], "the newest take is the one the story tells"
    assert takes[1]["id"] != row["id"], "2/4 is not the row the transcript is keyed by"


def test_editing_a_take_that_is_not_live_edits_that_take(client):
    """The bug, at the level the client's fix depends on.

    Saving against take 2's own id must land on take 2 — not be refused for
    being off the path, and not be redirected onto the live row.
    """
    row, takes = _four_takes(client)
    second = takes[1]

    r = _edit(client, second["id"], "Take 2, rewritten.")
    assert r.status_code == 200, r.text
    assert r.json()["text"] == "Take 2, rewritten."

    after = _takes(client, row["id"])
    assert [t["text"] for t in after] == [
        "Take 1.", "Take 2, rewritten.", "Take 3.", "Take 4.",
    ], "one take changed, and only the one addressed"


def test_editing_a_take_leaves_the_live_one_alone(client):
    """What the page did instead: the reader saw 2/4 and 4/4 was overwritten."""
    row, takes = _four_takes(client)

    _edit(client, takes[1]["id"], "Take 2, rewritten.")

    assert _live_ai(client)["text"] == "Take 4.", "the story still tells what it told"


def test_a_take_edit_survives_paging_away_and_back(client):
    """The listing is the pager's only source, so the edit has to be in it.

    (The client caches this list per message; the fix drops that cache after an
    edit. If the server ever started answering from a copy of its own, stepping
    away and back would show the words before the edit and nobody would see it
    here — hence the round trip.)
    """
    row, takes = _four_takes(client)
    _edit(client, takes[1]["id"], "Take 2, rewritten.")

    # Addressed by the live row, as the pager does, and by the edited take
    # itself, as a client holding that id would.
    assert _takes(client, row["id"])[1]["text"] == "Take 2, rewritten."
    assert _takes(client, takes[1]["id"])[1]["text"] == "Take 2, rewritten."


def test_an_edited_take_is_still_the_take_it_was(client):
    """Editing text is not switching, forking, or reordering."""
    row, takes = _four_takes(client)
    _edit(client, takes[1]["id"], "Take 2, rewritten.")

    after = _takes(client, row["id"])
    assert [t["id"] for t in after] == [t["id"] for t in takes], "same rows, same order"
    assert [t["active"] for t in after] == [False, False, False, True]
    assert _live_ai(client)["take_index"] == 3, "still 4/4 on screen"