"""
Pytest configuration and shared fixtures for Library Desk tests.

TENANT SAFETY MODEL
===================
There is no separate test infrastructure: integration tests run against the
SHARED production services (Qdrant / Neo4j / Wiki.js / Redis / Wiki.js).
Tenancy is the ONLY isolation wall, therefore:

- The suite is pinned to the reserved test tenant ``llm_tester`` (env
  ``TEST_TENANT`` may only select a tenant inside the reserved
  ``llm_tester*`` namespace — anything else aborts the whole session).
- The production tenant ``jpmschweitzer`` is NEVER written to. A session
  guard hard-fails immediately if the effective tenant is the production
  tenant or outside the reserved namespace.
- Integration tests (marked ``integration``) only run when
  ``RUN_INTEGRATION_TESTS=1`` is set; otherwise they are skipped. Offline
  unit tests never contact the shared services.
- A session-scoped teardown deletes ALL ``llm_tester`` artifacts created
  during the run (Qdrant ``*_llm_tester`` collections, Neo4j nodes under
  the ``User_Llm_Tester*`` labels, the ``users/llm_tester`` wiki subtree,
  and ``llm_tester``-prefixed Redis keys on the service DB), with a hard
  assertion on the tenant string before any delete.

HOSTS
=====
``TEST_HOST`` selects where the shared services live. It defaults to
``localhost`` (safe: nothing listens there unless you forwarded the
services yourself). For live runs against the shared stack set it
explicitly, e.g. ``TEST_HOST=192.168.86.149``.

The API under test is the LOCAL wakeup server (``./wakeup.sh``, port 8778),
selected via ``LIBRARY_DESK_URL`` (default ``http://localhost:8778``).
NEVER point tests at the production container (port 8089).
"""

import asyncio
import logging
import os

import pytest

from src.core.multi_tenancy import sanitize_user_id

logger = logging.getLogger(__name__)

pytest_plugins = ("pytest_asyncio",)

# ---------------------------------------------------------------------------
# Tenancy constants
# ---------------------------------------------------------------------------

#: The production tenant. No test may ever write under it.
PRODUCTION_TENANT = "jpmschweitzer"

#: The reserved test tenant namespace. The effective tenant must be
#: exactly this or a sub-tenant of it (llm_tester_*).
RESERVED_TEST_TENANT = "llm_tester"

#: Effective tenant for the whole suite (guard-checked below).
TEST_TENANT = os.environ.get("TEST_TENANT", RESERVED_TEST_TENANT)

# ---------------------------------------------------------------------------
# Hosts / URLs
# ---------------------------------------------------------------------------

#: Shared-services host. Default localhost — NOT the production host.
TEST_HOST = os.environ.get("TEST_HOST", "localhost")

#: Base URL of the local dev server under test (./wakeup.sh, port 8778).
LIBRARY_DESK_URL = os.environ.get("LIBRARY_DESK_URL", "http://localhost:8778")

RUN_INTEGRATION = os.environ.get("RUN_INTEGRATION_TESTS") == "1"


def is_reserved_test_tenant(tenant: str) -> bool:
    """True if tenant is inside the reserved llm_tester namespace."""
    sanitized = sanitize_user_id(tenant)
    return sanitized == RESERVED_TEST_TENANT or sanitized.startswith(
        RESERVED_TEST_TENANT + "_"
    )


def assert_safe_test_tenant(tenant: str) -> str:
    """
    Hard assertion used before ANY destructive operation.

    Raises AssertionError unless the tenant is inside the reserved test
    namespace and is not the production tenant.
    """
    sanitized = sanitize_user_id(tenant)
    assert sanitized != sanitize_user_id(PRODUCTION_TENANT), (
        f"TENANT GUARD: refusing to touch production tenant {tenant!r}"
    )
    assert is_reserved_test_tenant(tenant), (
        f"TENANT GUARD: {tenant!r} is not in the reserved test namespace "
        f"({RESERVED_TEST_TENANT}*)"
    )
    return sanitized


# ---------------------------------------------------------------------------
# Session guard + integration gating
# ---------------------------------------------------------------------------


def pytest_collection_modifyitems(config, items):
    """Skip integration-marked tests unless explicitly enabled AND safe."""
    if RUN_INTEGRATION and is_reserved_test_tenant(TEST_TENANT):
        return
    reason = (
        "integration tests disabled (set RUN_INTEGRATION_TESTS=1, TEST_HOST "
        "and TEST_TENANT inside the reserved llm_tester namespace to run "
        "against the shared services)"
    )
    skip_marker = pytest.mark.skip(reason=reason)
    for item in items:
        if "integration" in item.keywords:
            item.add_marker(skip_marker)


@pytest.fixture(scope="session", autouse=True)
def tenant_guard():
    """
    Session guard: hard-fail the entire run if the effective tenant is the
    production tenant or outside the reserved test namespace.
    """
    if sanitize_user_id(TEST_TENANT) == sanitize_user_id(PRODUCTION_TENANT):
        pytest.exit(
            f"TENANT GUARD: effective test tenant is the PRODUCTION tenant "
            f"({TEST_TENANT!r}) - aborting the whole session.",
            returncode=3,
        )
    if not is_reserved_test_tenant(TEST_TENANT):
        pytest.exit(
            f"TENANT GUARD: effective test tenant {TEST_TENANT!r} is not in "
            f"the reserved test namespace ({RESERVED_TEST_TENANT}*) - "
            f"aborting the whole session.",
            returncode=3,
        )
    yield


# ---------------------------------------------------------------------------
# Session teardown: purge ALL llm_tester artifacts created during the run
# ---------------------------------------------------------------------------


async def _purge_qdrant_test_artifacts() -> None:
    """Delete Qdrant collections belonging to the reserved test tenant."""
    from qdrant_client import QdrantClient

    tenant = assert_safe_test_tenant(TEST_TENANT)
    client = QdrantClient(url=f"http://{TEST_HOST}:6333", timeout=10)
    try:
        for coll in client.get_collections().collections:
            name = coll.name
            # Only *_<tenant> style collections (library_desk_llm_tester,
            # volatile_llm_tester, memories_llm_tester, ...).
            if not (name.endswith(f"_{tenant}") or f"_{tenant}_" in name):
                continue
            assert PRODUCTION_TENANT not in name  # hard guard
            assert tenant in name
            client.delete_collection(name)
            logger.info(f"[teardown] deleted Qdrant collection {name}")
    finally:
        client.close()


async def _purge_neo4j_test_artifacts() -> None:
    """Delete Neo4j nodes under the reserved test tenant's labels."""
    from src.clients.neo4j_client import Neo4jClient
    from src.config import get_settings
    from src.core.multi_tenancy import get_neo4j_user_base_label

    tenant = assert_safe_test_tenant(TEST_TENANT)
    label_prefix = get_neo4j_user_base_label(tenant)  # e.g. User_Llm_Tester
    assert "Jpmschweitzer" not in label_prefix  # hard guard
    assert "Llm_Tester" in label_prefix

    settings = get_settings()
    client = Neo4jClient(
        uri=f"bolt://{TEST_HOST}:7687",
        user=settings.neo4j_user,
        password=settings.neo4j_password,
    )
    try:
        await client.connect()
        result = await client.execute_write(
            """
            MATCH (n)
            WHERE any(l IN labels(n) WHERE l STARTS WITH $prefix)
            DETACH DELETE n
            RETURN count(n) AS deleted
            """,
            {"prefix": label_prefix},
        )
        deleted = result[0]["deleted"] if result else 0
        if deleted:
            logger.info(f"[teardown] deleted {deleted} Neo4j {label_prefix}* nodes")
    finally:
        await client.close()


async def _purge_wiki_test_artifacts() -> None:
    """Delete the reserved test tenant's wiki subtree (users/llm_tester)."""
    from src.clients.wikijs_client import WikiJSClient
    from src.config import get_settings

    tenant = assert_safe_test_tenant(TEST_TENANT)
    settings = get_settings()
    client = WikiJSClient(
        base_url=settings.wikijs_url,
        api_token=settings.wiki_graphql_api,
    )
    try:
        for prefix in (f"users/{tenant}", f"users/{tenant.replace('_', '-')}"):
            assert PRODUCTION_TENANT not in prefix  # hard guard
            pages = await client.list_all_pages(path_prefix=prefix)
            for page in pages:
                path = page.get("path", "")
                assert PRODUCTION_TENANT not in path  # hard guard
                assert path.lstrip("/").startswith("users/llm")
                await client.delete_page(page["id"])
                logger.info(f"[teardown] deleted wiki page {path} (id={page['id']})")
    finally:
        await client.close()


async def _purge_redis_test_artifacts() -> None:
    """Delete llm_tester-prefixed keys on the Redis DB the service uses."""
    import redis.asyncio as aioredis

    from src.config import get_settings

    tenant = assert_safe_test_tenant(TEST_TENANT)
    settings = get_settings()
    client = aioredis.from_url(
        f"redis://{TEST_HOST}:6379/{settings.redis_db}",
        encoding="utf-8",
        decode_responses=True,
    )
    try:
        deleted = 0
        for pattern in (f"*{tenant}*", f"*{tenant.replace('_', '-')}*"):
            async for key in client.scan_iter(match=pattern, count=200):
                assert PRODUCTION_TENANT not in key  # hard guard
                assert "llm" in key
                await client.delete(key)
                deleted += 1
        if deleted:
            logger.info(f"[teardown] deleted {deleted} Redis keys for {tenant}")
    finally:
        await client.aclose()


@pytest.fixture(scope="session", autouse=True)
def purge_test_tenant_artifacts(tenant_guard):
    """
    Session teardown: after the run, delete ALL artifacts under the reserved
    test tenant on the shared services. Only active for integration runs
    (offline unit-test runs never touch the shared services and must not
    try to connect to them).
    """
    yield
    if not RUN_INTEGRATION:
        return

    # Hard assertion before ANY delete.
    assert_safe_test_tenant(TEST_TENANT)

    async def _teardown():
        for name, purge in (
            ("qdrant", _purge_qdrant_test_artifacts),
            ("neo4j", _purge_neo4j_test_artifacts),
            ("wiki", _purge_wiki_test_artifacts),
            ("redis", _purge_redis_test_artifacts),
        ):
            try:
                await purge()
            except AssertionError:
                raise  # tenant-guard violations must never be swallowed
            except Exception as e:
                logger.warning(f"[teardown] {name} purge failed: {e}")

    # Sync fixture + asyncio.run avoids the session/function loop-scope
    # mismatch (see CLAUDE.md).
    asyncio.run(_teardown())


# ---------------------------------------------------------------------------
# Shared fixtures
# ---------------------------------------------------------------------------


@pytest.fixture
def test_user() -> str:
    """The reserved test tenant. Pinned for the whole suite."""
    return TEST_TENANT


@pytest.fixture
def library_desk_url() -> str:
    """Base URL of the LOCAL dev server under test (never production :8089)."""
    return LIBRARY_DESK_URL


@pytest.fixture
def neo4j_test_uri() -> str:
    """Test Neo4j URI."""
    return f"bolt://{TEST_HOST}:7687"


@pytest.fixture
def neo4j_test_auth() -> tuple:
    """Test Neo4j authentication."""
    from src.config import get_settings
    settings = get_settings()
    return ("neo4j", settings.neo4j_password)


@pytest.fixture
def qdrant_test_url() -> str:
    """Test Qdrant URL."""
    return f"http://{TEST_HOST}:6333"


@pytest.fixture
def wikijs_test_config() -> dict:
    """Test Wiki.js configuration (URL from settings, host env-overridable)."""
    from src.config import get_settings
    settings = get_settings()
    return {
        "base_url": settings.wikijs_url,
        "api_token": settings.wiki_graphql_api
    }


@pytest.fixture
def searxng_test_url() -> str:
    """Test SearXNG URL."""
    return f"http://{TEST_HOST}:8080"


@pytest.fixture
def ollama_test_config() -> dict:
    """Test Ollama configuration."""
    from src.config import get_settings
    settings = get_settings()
    return {
        "base_url": f"http://{TEST_HOST}:11434",
        "model": settings.ollama_embedding_model
    }


@pytest.fixture
def redis_test_url() -> str:
    """Test Redis URL."""
    from src.config import get_settings
    settings = get_settings()
    return f"redis://{TEST_HOST}:6379/{settings.redis_db}"


@pytest.fixture
def sample_document() -> dict:
    """Sample document for testing."""
    return {
        "id": "test_doc_1",
        "title": "Test Document",
        "content": "This is a test document for unit testing.",
        "metadata": {
            "source": "test",
            "author": TEST_TENANT
        }
    }


@pytest.fixture
def sample_chunks() -> list:
    """Sample document chunks for testing."""
    return [
        {
            "content": "First chunk of text.",
            "metadata": {"chunk_index": 0}
        },
        {
            "content": "Second chunk of text.",
            "metadata": {"chunk_index": 1}
        },
        {
            "content": "Third chunk of text.",
            "metadata": {"chunk_index": 2}
        }
    ]


@pytest.fixture
def sample_embeddings() -> list:
    """Sample embeddings for testing (768-dimensional for nomic-embed-text)."""
    import random
    random.seed(42)  # Reproducible embeddings

    # Generate 3 sample 768-dimensional embeddings
    return [
        [random.random() for _ in range(768)],
        [random.random() for _ in range(768)],
        [random.random() for _ in range(768)]
    ]