"""M10 §14 and §15: the profiles travel, and an M9 database opens.

Two questions, and they are the ones a reader would ask if they knew what M10
had done to their machine:

* **§14 — does a campaign still move?** A visual profile is part of the campaign
  the reader built, so it belongs in the bundle. It is also *new*, which is the
  risk: an exporter that carries it and an importer that drops it both pass a
  test that only checks the campaign still opens.
* **§15 — does the database I already have still work?** M10 adds one table and
  nothing else. An existing campaign must survive opening under the new build
  untouched, opening must not care how many times it happens, the schema an M9
  file reaches must be the schema a fresh install has, and M9's backup must keep
  working on the result.

The upgrade needs **no migration**: `create_all` builds a new table and the
indexes declared on its columns on every path. A `CREATE INDEX` migration was
written here first and `test_a_fresh_database_arrives_at_the_same_place` is what
found it wrong — it left an upgraded database holding an index a fresh install
did not have. That test is the one to keep pointed at any future schema change.

The bundle format stays `ai-dnd-adventure-v3`. M9's own test for a version bump
is whether omission creates ambiguity about what an older file *could* have
recorded, and it does not: a campaign with no visual profiles is the ordinary
case, so an absent key means "none" rather than "unknown". The tests below hold
that decision to its consequence — an M9-written v3 file must still import, and
the M10 exporter must still produce a file an M9 build would recognise.

    python -m pytest tests/test_m10_bundle.py -v
"""

import copy
import os
import shutil
import sqlite3
import tempfile
from pathlib import Path

import pytest
from fastapi import Depends
from fastapi.testclient import TestClient
from sqlalchemy import create_engine, text
from sqlalchemy.orm import sessionmaker

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

import m10_fixture
from fakes import ScriptedProvider
from test_process_restart import Server, _free_port


@pytest.fixture()
def client(monkeypatch):
    Base.metadata.create_all(bind=engine)
    setup = SessionLocal()
    user = models.User(is_guest=False, email="m10bundle@example.com")
    setup.add(user)
    setup.flush()
    setup.add(models.Settings(user_id=user.id, model="test-model",
                              embedding_model=""))
    adventure = models.Adventure(user_id=user.id, title="Portable office")
    setup.add(adventure)
    setup.flush()
    setup.add(models.Action(adventure_id=adventure.id, type="start",
                            text="Bill badges in."))
    setup.commit()
    adv_id, user_id = adventure.id, user.id
    setup.close()

    monkeypatch.setattr(limits, "check_row_cap", lambda *a, **k: None)
    monkeypatch.setattr(adventures.turns, "OpenAICompatibleProvider", ScriptedProvider)
    app.dependency_overrides[auth.get_current_user] = (
        lambda db=Depends(get_db): db.get(models.User, user_id)
    )
    test_client = TestClient(app)
    test_client.adv_id = adv_id
    try:
        yield test_client
    finally:
        app.dependency_overrides.clear()
        adventures.turns._active_turns.clear()
        Base.metadata.drop_all(bind=engine)


def export(client, adv_id=None) -> dict:
    response = client.get(f"/api/adventures/{adv_id or client.adv_id}/export")
    assert response.status_code == 200, response.text[:400]
    return response.json()


def bring_back(client, payload) -> int:
    response = client.post("/api/adventures/import", json=payload)
    assert response.status_code == 201, response.text[:600]
    return response.json()["id"]


def profiles_of(client, adv_id) -> dict:
    body = client.get(f"/api/adventures/{adv_id}/visual-profiles").json()
    return {p["entity_key"]: p for p in body["profiles"]}


@pytest.fixture()
def moved(client):
    """The office campaign, its bundle, and the copy the bundle produced."""
    m10_fixture.build(client, client.adv_id)
    payload = export(client)
    return {"bundle": payload, "copy_id": bring_back(client, payload)}


# --------------------------------------------------------------- §14 the file

def test_the_format_version_is_unchanged(moved):
    """The decision, recorded as a test so a later bump is deliberate."""
    assert moved["bundle"]["format"] == "ai-dnd-adventure-v3"


def test_the_bundle_carries_the_profiles_that_exist(moved):
    exported = {p["entityKey"]: p for p in moved["bundle"]["visualProfiles"]}
    assert set(exported) == {"alice", "office"}
    assert exported["alice"]["descriptors"]["hair"] == "short black"
    assert exported["alice"]["features"] == ["tortoiseshell glasses"]
    assert exported["alice"]["styleNotes"] == "photographic, natural light"


def test_an_unprofiled_character_exports_no_empty_profile(moved):
    """Roger has no profile, and the file must say that by omission.

    An exporter that wrote a blank row for every entity would lose the
    distinction a provider needs: "nobody decided what Roger looks like" is not
    "Roger looks like nothing".
    """
    keys = [p["entityKey"] for p in moved["bundle"]["visualProfiles"]]
    assert "roger" not in keys and "bill" not in keys


def test_the_copy_holds_the_same_profiles(client, moved):
    original = profiles_of(client, client.adv_id)
    copied = profiles_of(client, moved["copy_id"])
    assert set(copied) == set(original)
    for key in original:
        assert copied[key]["descriptors"] == original[key]["descriptors"]
        assert copied[key]["features"] == original[key]["features"]
        assert copied[key]["style_notes"] == original[key]["style_notes"]


def test_the_copys_profiles_are_its_own_rows(client, moved):
    """Editing the copy must not reach back into the original."""
    client.put(f"/api/adventures/{moved['copy_id']}/visual-profiles/alice",
               json={"descriptors": {"hair": "bleached"}})
    assert profiles_of(client, client.adv_id)["alice"][
        "descriptors"]["hair"] == "short black"


def test_the_copys_scene_packet_is_populated_from_the_imported_profiles(
        client, moved):
    """The point of carrying them: the copy can be depicted without redoing work."""
    packet = client.get(
        f"/api/adventures/{moved['copy_id']}/scene-packet").json()
    by_name = {c["name"]: c for c in packet["characters"]}
    assert by_name["Alice"]["visual_profile"]["descriptors"]["build"] == "tall"
    assert by_name["Roger"]["visual_profile"] is None
    assert packet["location"]["visual_profile"]["descriptors"][
        "lighting"] == "flat fluorescent"


def test_an_m9_era_file_still_imports_and_simply_has_no_profiles(client, moved):
    """A v3 file written before M10 existed: the key is absent, not empty."""
    older = copy.deepcopy(moved["bundle"])
    del older["visualProfiles"]
    copy_id = bring_back(client, older)
    assert profiles_of(client, copy_id) == {}
    # And the campaign itself arrived intact.
    assert client.get(f"/api/adventures/{copy_id}/scene-packet").json()[
        "characters"]


def test_a_malformed_profile_is_dropped_rather_than_refusing_the_campaign(
        client, moved):
    """§14's proportionality rule, in the one place M10 could get it wrong.

    A story that will not import because a description of somebody's coat is
    malformed would be the wrong trade. The campaign arrives; the bad profile
    does not; the good one does.
    """
    damaged = copy.deepcopy(moved["bundle"])
    damaged["visualProfiles"].append(
        {"entity_key": "", "descriptors": "not an object"})
    damaged["visualProfiles"].append({"descriptors": {"a": "b"}})
    copy_id = bring_back(client, damaged)
    assert set(profiles_of(client, copy_id)) == {"alice", "office"}


def test_a_profile_survives_a_second_round_trip_unchanged(client, moved):
    """Export, import, export again: the file is a fixed point."""
    again = export(client, moved["copy_id"])
    first = sorted(moved["bundle"]["visualProfiles"], key=lambda p: p["entityKey"])
    second = sorted(again["visualProfiles"], key=lambda p: p["entityKey"])
    assert [p["entityKey"] for p in first] == [p["entityKey"] for p in second]
    for a, b in zip(first, second):
        assert a["descriptors"] == b["descriptors"]
        assert a["features"] == b["features"]
        assert a["styleNotes"] == b["styleNotes"]


def test_a_neighbouring_campaigns_profiles_do_not_travel(client, moved):
    """Scoping: the exporter must filter by campaign, not by table."""
    with SessionLocal() as db:
        neighbour = models.Adventure(user_id=None, title="Someone else's")
        db.add(neighbour)
        db.flush()
        db.add(models.VisualProfile(
            adventure_id=neighbour.id, entity_key="intruder",
            descriptors={"hair": "should not travel"}, features=[],
            style_notes=""))
        db.commit()
    keys = [p["entityKey"] for p in export(client)["visualProfiles"]]
    assert "intruder" not in keys


def test_the_planner_checks_the_profiles_before_a_row_is_written(moved):
    """M9's atomicity rule: everything is checked before anything is written.

    `bundle.plan` is that checkpoint — it has no side effects and is what the
    importer runs first — so a profile that would fail must fail there rather
    than halfway through writing a campaign. There is no HTTP preview endpoint;
    the planner is called directly for the same reason the importer calls it.
    """
    from app import bundle as bundle_module

    planned = bundle_module.plan(moved["bundle"], "ai-dnd-adventure-v3")
    assert {p["entity_key"] for p in planned["visualProfiles"]} == {
        "alice", "office"}


# ---------------------------------------------------------- §15 the migration

@pytest.fixture()
def m9_database():
    """A database as an M9 build left it, with a campaign already in it.

    M10's only schema change is the `visual_profiles` table, so an M9-era file
    is exactly this: the current schema without that table, stamped at 92 — the
    version M9 ended on and, since M10 adds no migration, the version it still
    ends on. The campaign rows are written before the upgrade, because the claim
    under test is that they are still there afterwards.
    """
    directory = tempfile.mkdtemp(prefix="m10-migrate-")
    path = Path(directory) / "campaign.db"
    older = create_engine(f"sqlite:///{path}")
    Base.metadata.create_all(bind=older)
    # Written through the ORM, so the campaign in the file is shaped the way the
    # application writes one rather than the way a test guessed at.
    with sessionmaker(bind=older)() as db:
        adventure = models.Adventure(title="An M9 campaign")
        db.add(adventure)
        db.flush()
        db.add(models.Action(adventure_id=adventure.id, type="start",
                             text="The story opened before M10."))
        db.commit()
        adv_id = adventure.id
    with older.begin() as conn:
        conn.execute(text("DROP TABLE visual_profiles"))
        conn.execute(text("PRAGMA user_version = 92"))
    older.dispose()
    yield path, create_engine(f"sqlite:///{path}"), adv_id


def _indexes(engine_) -> set:
    with engine_.begin() as conn:
        return {row[0] for row in conn.execute(text(
            "SELECT name FROM sqlite_master WHERE type = 'index'"))}


def _version(engine_) -> int:
    with engine_.begin() as conn:
        return conn.execute(text("PRAGMA user_version")).scalar()


def test_an_m9_database_gains_the_new_table_when_it_is_opened(m9_database):
    path, older, adv_id = m9_database
    assert _version(older) == 92
    migrations.bootstrap(older)
    assert _version(older) == migrations.LATEST_VERSION == 92
    with older.begin() as conn:
        assert conn.execute(text("SELECT COUNT(*) FROM visual_profiles")).scalar() == 0
    assert "ix_visual_profiles_adventure_id" in _indexes(older)


def test_the_campaign_that_was_already_there_is_untouched(m9_database):
    path, older, adv_id = m9_database
    migrations.bootstrap(older)
    with older.begin() as conn:
        assert conn.execute(text("SELECT title FROM adventures")).scalar() == (
            "An M9 campaign")
        assert conn.execute(text("SELECT text FROM actions")).scalar() == (
            "The story opened before M10.")
        assert conn.execute(text("PRAGMA foreign_key_check")).fetchall() == []


def test_opening_the_database_repeatedly_is_a_no_op(m9_database):
    """Three starts in a row. Nothing accumulates and nothing errors.

    This is the idempotence §15 asks about. It is stated as "open it again"
    rather than "run the migration again" because opening is what the
    application does, and M10 has no migration of its own to rerun.
    """
    path, older, adv_id = m9_database
    migrations.bootstrap(older)
    after_first = _indexes(older)
    for _ in range(2):
        migrations.bootstrap(older)
    assert _version(older) == 92
    assert _indexes(older) == after_first
    with older.begin() as conn:
        assert conn.execute(text("SELECT COUNT(*) FROM adventures")).scalar() == 1


def test_a_fresh_database_arrives_at_the_same_place(m9_database):
    """An upgraded M9 file and a new install must not differ.

    Two schemas that disagree is the failure this catches, and it is the one a
    version stamp alone would hide.
    """
    path, older, adv_id = m9_database
    migrations.bootstrap(older)
    fresh_path = path.with_name("fresh.db")
    fresh = create_engine(f"sqlite:///{fresh_path}")
    migrations.bootstrap(fresh)
    assert _version(fresh) == _version(older)

    def shape(e):
        with e.begin() as conn:
            return conn.execute(text(
                "SELECT sql FROM sqlite_master WHERE name = 'visual_profiles'"
            )).scalar()

    assert shape(fresh) == shape(older)
    # Including the indexes. This comparison is what caught the redundant
    # `CREATE INDEX` migration M10 first shipped: the upgraded file had an index
    # the fresh one did not, which is a difference no test of either database on
    # its own would have shown.
    assert _indexes(fresh) == _indexes(older)
    fresh.dispose()


def test_a_backup_of_the_upgraded_database_still_works(m9_database):
    """M9's backup keeps its guarantees on a file M10 added a table to."""
    path, older, adv_id = m9_database
    migrations.bootstrap(older)
    older.dispose()

    result = backup.create(path)
    try:
        assert result.integrity == "ok"
        assert result.pages > 0
        with sqlite3.connect(f"file:{result.path}?mode=ro", uri=True) as copy_db:
            assert copy_db.execute("PRAGMA quick_check").fetchone()[0] == "ok"
            assert copy_db.execute("PRAGMA foreign_key_check").fetchall() == []
            # It opens independently: the new table is in it, and so is the
            # campaign that predates the migration.
            assert copy_db.execute(
                "SELECT COUNT(*) FROM visual_profiles").fetchone()[0] == 0
            assert copy_db.execute(
                "SELECT title FROM adventures").fetchone()[0] == "An M9 campaign"
            assert copy_db.execute("PRAGMA user_version").fetchone()[0] == 92
    finally:
        result.path.unlink(missing_ok=True)


def test_a_backup_carries_the_profiles_written_after_the_upgrade(m9_database):
    path, older, adv_id = m9_database
    migrations.bootstrap(older)
    with older.begin() as conn:
        conn.execute(text(
            "INSERT INTO visual_profiles "
            "(adventure_id, entity_key, descriptors, features, style_notes, "
            " created_at, updated_at) "
            "VALUES (:adv, 'bill', '{\"build\": \"heavyset\"}', '[]', '', "
            "        datetime('now'), datetime('now'))"), {"adv": adv_id})
    older.dispose()

    result = backup.create(path)
    try:
        with sqlite3.connect(f"file:{result.path}?mode=ro", uri=True) as copy_db:
            row = copy_db.execute(
                "SELECT entity_key, descriptors FROM visual_profiles").fetchone()
            assert row[0] == "bill" and "heavyset" in row[1]
    finally:
        result.path.unlink(missing_ok=True)


# ------------------------------------- §14 the move to a machine that never saw it

@pytest.fixture()
def machines():
    """Two directories, each with its own database, and a server on each.

    The same shape as `test_m9_clean_import.py`, for the same reason: a shared
    id space, a warm cache or a session still holding the original would let an
    in-process import pass while a real move failed. M9's version of this test
    predates visual profiles and carries none, so this is the profile-carrying
    half of the same claim rather than a duplicate of it.
    """
    root = tempfile.mkdtemp(prefix="m10-clean-")
    started: list[Server] = []

    def start(name: str) -> Server:
        directory = os.path.join(root, name)
        os.makedirs(directory, exist_ok=True)
        server = Server(os.path.join(directory, "campaign.db"), _free_port())
        started.append(server)
        server.wait_until_ready()
        return server

    try:
        yield start
    finally:
        for server in started:
            server.stop()
        shutil.rmtree(root, ignore_errors=True)


def test_profiles_reach_a_clean_data_directory_on_another_machine(machines):
    """§14's Definition-of-Done clause, run across two real processes.

    Machine A plays a campaign, profiles two entities and exports. Machine B is
    a database file that has never existed before, in a different directory, in
    a different process — migrations run there from nothing. Nothing crosses but
    the bundle.
    """
    a = machines("machine-a")
    campaign = a.call("POST", "/adventures",
                      {"title": "Moving day", "opening": "The office is quiet."},
                      expect=201)
    adv = campaign["id"]
    a.call("POST", f"/adventures/{adv}/state/corrections", {
        "events": [
            {"type": "create_entity", "entity": "alice",
             "entity_type": "character", "name": "Alice"},
            {"type": "create_entity", "entity": "roger",
             "entity_type": "character", "name": "Roger"},
            {"type": "create_entity", "entity": "office",
             "entity_type": "location", "name": "The office"},
            {"type": "set_scene", "summary": "Alice and Roger wait in the office.",
             "location": "office", "present": ["alice", "roger"]},
        ],
        "note": "setting the scene",
    }, expect=201)
    a.call("PUT", f"/adventures/{adv}/visual-profiles/alice",
           {"descriptors": {"build": "tall", "hair": "short black"},
            "features": ["tortoiseshell glasses"],
            "style_notes": "photographic, natural light"}, expect=200)
    a.call("PUT", f"/adventures/{adv}/visual-profiles/office",
           {"descriptors": {"lighting": "flat fluorescent"}}, expect=200)
    payload = a.call("GET", f"/adventures/{adv}/export", expect=200)
    source_packet = a.call("GET", f"/adventures/{adv}/scene-packet", expect=200)
    a.stop()
    assert not a.is_listening()

    b = machines("machine-b")
    moved = b.call("POST", "/adventures/import", payload, expect=201)["id"]

    profiles = {p["entity_key"]: p for p in b.call(
        "GET", f"/adventures/{moved}/visual-profiles", expect=200)["profiles"]}
    assert set(profiles) == {"alice", "office"}
    assert profiles["alice"]["features"] == ["tortoiseshell glasses"]
    assert profiles["alice"]["style_notes"] == "photographic, natural light"

    # The packet the copy builds describes the same scene, with the same
    # profiles attached and Roger still deliberately unprofiled. Only the
    # campaign id differs, which is what a new machine's id space means.
    moved_packet = b.call("GET", f"/adventures/{moved}/scene-packet", expect=200)
    assert moved_packet["action_summary"] == source_packet["action_summary"]
    by_name = {c["name"]: c for c in moved_packet["characters"]}
    assert by_name["Alice"]["visual_profile"]["descriptors"]["hair"] == "short black"
    assert by_name["Roger"]["visual_profile"] is None
    assert moved_packet["location"]["visual_profile"]["descriptors"][
        "lighting"] == "flat fluorescent"