"""Soft delete over HTTP, against real Postgres and real Qdrant (ADR-0002).

The unit tests in `tests/unit/application/points/test_deletion.py` decide
whether the relink logic is right. This file decides whether it is right
*through the stack*: real routing and scope checks, a tenant derived from a real
API key, and a real filtered `set_payload` batch — the last of which is the part
a fake can only approximate, since Qdrant reports success for a patch that
matched nothing.

`DELETE /v1/files/{file_id}` is here too rather than with the upload tests: it
spans both stores, and the assertion that matters is the one about points.
"""

import uuid
from collections.abc import AsyncIterator

import pytest
import pytest_asyncio
from asgi_lifespan import LifespanManager
from httpx import ASGITransport, AsyncClient
from qdrant_client import AsyncQdrantClient
from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker

from src.bootstrap.dependencies import get_sessionmaker
from src.config import QdrantSettings, Settings
from src.infrastructure.postgres.repositories import source_files as source_files_repo
from src.infrastructure.qdrant.collection import ensure_chunks_collection
from src.infrastructure.qdrant.points import QdrantPointStorage
from src.main import create_app
from tests.support.factories import create_api_key, create_source_file, create_tenant
from tests.support.point_contract import SeedSpec, chunk_point_for, point_id_for

pytestmark = [
    pytest.mark.integration,
    pytest.mark.qdrant,
    pytest.mark.postgres,
    pytest.mark.asyncio(loop_scope="session"),
]

FILE_ID = uuid.UUID("cccccccc-cccc-4ccc-8ccc-cccccccccccc")


@pytest.fixture
def api_settings(settings: Settings, qdrant_settings: QdrantSettings) -> Settings:
    return settings.model_copy(update={"qdrant": qdrant_settings})


@pytest_asyncio.fixture(loop_scope="session")
async def api_client(
    api_settings: Settings, db_sessionmaker: async_sessionmaker[AsyncSession]
) -> AsyncIterator[AsyncClient]:
    app = create_app(api_settings)
    app.dependency_overrides[get_sessionmaker] = lambda: db_sessionmaker
    async with (
        LifespanManager(app) as manager,
        AsyncClient(transport=ASGITransport(app=manager.app), base_url="http://test") as client,
    ):
        yield client


def _auth(token: str) -> dict[str, str]:
    return {"Authorization": f"Bearer {token}"}


async def _tenant_with_key(
    db_session: AsyncSession, *, scopes: list[str] | None = None
) -> tuple[uuid.UUID, str]:
    tenant = await create_tenant(db_session)
    _, token = await create_api_key(
        db_session,
        tenant=tenant,
        scopes=scopes if scopes is not None else ["points:read", "points:write"],
    )
    await db_session.commit()
    return tenant.id, token


async def _seed_chain(
    qdrant_client: AsyncQdrantClient,
    qdrant_settings: QdrantSettings,
    *,
    tenant_id: uuid.UUID,
    file_id: uuid.UUID = FILE_ID,
    length: int = 3,
) -> list[uuid.UUID]:
    """A linked run of points, written the way ingestion writes them."""
    await ensure_chunks_collection(qdrant_client, collection=qdrant_settings.collection)
    ids = [point_id_for(file_id, index) for index in range(length)]
    points = []
    for index in range(length):
        chunk_point = chunk_point_for(
            SeedSpec(tenant_id, file_id, index, f"chunk {index}", float(index + 1))
        )
        chunk_point.payload["previous_chunk_id"] = str(ids[index - 1]) if index else None
        chunk_point.payload["next_chunk_id"] = str(ids[index + 1]) if index + 1 < length else None
        points.append(chunk_point)

    storage = QdrantPointStorage(qdrant_client, collection=qdrant_settings.collection)
    await storage.upsert_points(points)
    return ids


async def _read_point(
    api_client: AsyncClient, token: str, point_id: uuid.UUID
) -> dict[str, object]:
    response = await api_client.get(f"/v1/points/{point_id}", headers=_auth(token))
    assert response.status_code == 200
    payload: dict[str, object] = response.json()
    return payload


async def test_delete_point_deactivates_it_and_relinks_its_neighbours(
    api_client: AsyncClient,
    db_session: AsyncSession,
    qdrant_client: AsyncQdrantClient,
    qdrant_settings: QdrantSettings,
) -> None:
    tenant_id, token = await _tenant_with_key(db_session)
    first, middle, last = await _seed_chain(qdrant_client, qdrant_settings, tenant_id=tenant_id)

    response = await api_client.delete(f"/v1/points/{middle}", headers=_auth(token))

    assert response.status_code == 200
    assert response.json()["is_active"] is False
    assert response.json()["deleted_at"] is not None
    assert (await _read_point(api_client, token, first))["next_chunk_id"] == str(last)
    assert (await _read_point(api_client, token, last))["previous_chunk_id"] == str(first)


async def test_delete_point_keeps_the_point_in_qdrant(
    api_client: AsyncClient,
    db_session: AsyncSession,
    qdrant_client: AsyncQdrantClient,
    qdrant_settings: QdrantSettings,
) -> None:
    """Soft delete means soft: the point is still there, just not listed."""
    tenant_id, token = await _tenant_with_key(db_session)
    _, middle, _ = await _seed_chain(qdrant_client, qdrant_settings, tenant_id=tenant_id)

    await api_client.delete(f"/v1/points/{middle}", headers=_auth(token))

    listed = await api_client.get(
        "/v1/points", params={"file_id": str(FILE_ID)}, headers=_auth(token)
    )
    assert str(middle) not in [point["point_id"] for point in listed.json()["points"]]
    assert (await _read_point(api_client, token, middle))["is_active"] is False


async def test_delete_point_is_a_noop_success_the_second_time(
    api_client: AsyncClient,
    db_session: AsyncSession,
    qdrant_client: AsyncQdrantClient,
    qdrant_settings: QdrantSettings,
) -> None:
    tenant_id, token = await _tenant_with_key(db_session)
    first, middle, _ = await _seed_chain(qdrant_client, qdrant_settings, tenant_id=tenant_id)
    await api_client.delete(f"/v1/points/{middle}", headers=_auth(token))
    version_after_first = (await _read_point(api_client, token, first))["version"]

    again = await api_client.delete(f"/v1/points/{middle}", headers=_auth(token))

    assert again.status_code == 200
    assert again.json()["is_active"] is False
    assert (await _read_point(api_client, token, first))["version"] == version_after_first


async def test_delete_point_returns_404_for_another_tenants_point(
    api_client: AsyncClient,
    db_session: AsyncSession,
    qdrant_client: AsyncQdrantClient,
    qdrant_settings: QdrantSettings,
) -> None:
    """`404`, not `403`, and nothing is deactivated on the way to saying so."""
    owner_id, owner_token = await _tenant_with_key(db_session)
    _, intruder_token = await _tenant_with_key(db_session)
    _, middle, _ = await _seed_chain(qdrant_client, qdrant_settings, tenant_id=owner_id)

    response = await api_client.delete(f"/v1/points/{middle}", headers=_auth(intruder_token))

    assert response.status_code == 404
    assert response.json()["error"]["code"] == "not_found"
    assert (await _read_point(api_client, owner_token, middle))["is_active"] is True


async def test_delete_point_requires_the_points_write_scope(
    api_client: AsyncClient,
    db_session: AsyncSession,
    qdrant_client: AsyncQdrantClient,
    qdrant_settings: QdrantSettings,
) -> None:
    """A read-only key can see a point but must not be able to remove it."""
    tenant_id, token = await _tenant_with_key(db_session, scopes=["points:read"])
    _, middle, _ = await _seed_chain(qdrant_client, qdrant_settings, tenant_id=tenant_id)

    response = await api_client.delete(f"/v1/points/{middle}", headers=_auth(token))

    assert response.status_code == 403
    assert (await _read_point(api_client, token, middle))["is_active"] is True


async def test_delete_file_deactivates_every_point_and_retires_the_row(
    api_client: AsyncClient,
    db_session: AsyncSession,
    db_sessionmaker: async_sessionmaker[AsyncSession],
    qdrant_client: AsyncQdrantClient,
    qdrant_settings: QdrantSettings,
) -> None:
    tenant = await create_tenant(db_session)
    _, token = await create_api_key(
        db_session, tenant=tenant, scopes=["points:read", "points:write"]
    )
    file_id = uuid.uuid4()
    await create_source_file(db_session, tenant=tenant, source_file_id=file_id)
    await db_session.commit()
    await _seed_chain(qdrant_client, qdrant_settings, tenant_id=tenant.id, file_id=file_id)

    response = await api_client.delete(f"/v1/files/{file_id}", headers=_auth(token))

    assert response.status_code == 200
    assert response.json()["points_soft_deleted"] == 3
    listed = await api_client.get(
        "/v1/points", params={"file_id": str(file_id)}, headers=_auth(token)
    )
    assert listed.json()["points"] == []

    async with db_sessionmaker() as session:
        row = await source_files_repo.get_by_id(
            session, tenant_id=tenant.id, source_file_id=file_id
        )
    assert row is not None
    assert row.status == "soft_deleted"
    assert row.deleted_at is not None


async def test_delete_file_returns_404_for_another_tenants_file(
    api_client: AsyncClient,
    db_session: AsyncSession,
    qdrant_client: AsyncQdrantClient,
    qdrant_settings: QdrantSettings,
) -> None:
    """The authorization check runs before the sweep, so nothing is deactivated."""
    owner = await create_tenant(db_session)
    _, owner_token = await create_api_key(
        db_session, tenant=owner, scopes=["points:read", "points:write"]
    )
    intruder = await create_tenant(db_session)
    _, intruder_token = await create_api_key(
        db_session, tenant=intruder, scopes=["points:read", "points:write"]
    )
    file_id = uuid.uuid4()
    await create_source_file(db_session, tenant=owner, source_file_id=file_id)
    await db_session.commit()
    await _seed_chain(qdrant_client, qdrant_settings, tenant_id=owner.id, file_id=file_id)

    response = await api_client.delete(f"/v1/files/{file_id}", headers=_auth(intruder_token))

    assert response.status_code == 404
    assert response.json()["error"]["code"] == "not_found"
    listed = await api_client.get(
        "/v1/points", params={"file_id": str(file_id)}, headers=_auth(owner_token)
    )
    assert len(listed.json()["points"]) == 3


async def test_delete_file_requires_the_points_write_scope(
    api_client: AsyncClient, db_session: AsyncSession
) -> None:
    tenant = await create_tenant(db_session)
    _, token = await create_api_key(db_session, tenant=tenant, scopes=["files:write"])
    file_id = uuid.uuid4()
    await create_source_file(db_session, tenant=tenant, source_file_id=file_id)
    await db_session.commit()

    response = await api_client.delete(f"/v1/files/{file_id}", headers=_auth(token))

    assert response.status_code == 403