"""Shared integration fixtures: a fully-wired gateway app driven in-process.

The integration tests build the real :func:`neuronetz_gateway.app.create_app`
(lifespan + AuthMiddleware + routes) against testcontainers Postgres + Redis,
with the upstream Ollama overridden to the in-process mock via
``get_ollama_client`` (the override contract documented in ``deps.py``).

The fixture also creates a tenant + API key directly through the repositories
so tests don't depend on the CLI being present, and seeds the in-process
discovery cache with the mock catalogue so the model allowlist resolves without
relying on the background poller racing against the test.

Skips cleanly when Docker is unavailable (the postgres/redis container fixtures
self-skip). All env vars are scoped to the fixture and the settings cache is
cleared so the app reads them fresh.
"""

from __future__ import annotations

import asyncio
import secrets
import uuid
from collections.abc import AsyncIterator
from dataclasses import dataclass
from typing import Any

import httpx
import pytest
import pytest_asyncio
from argon2 import PasswordHasher
from fastapi import FastAPI
from sqlalchemy import text
from sqlalchemy.ext.asyncio import AsyncEngine, async_sessionmaker, create_async_engine
from testcontainers.postgres import PostgresContainer
from testcontainers.redis import RedisContainer

from neuronetz_gateway.app import create_app
from neuronetz_gateway.auth.hashing import build_hasher, hash_secret
from neuronetz_gateway.auth.keys import generate_key
from neuronetz_gateway.config import Settings, get_settings
from neuronetz_gateway.db.repositories import (
    ApiKeyRepository,
    KeyLimitRepository,
    TenantRepository,
)
from neuronetz_gateway.deps import get_ollama_client
from neuronetz_gateway.proxy.discovery import DiscoveredModel, names_of
from neuronetz_gateway.proxy.ollama import OllamaClient
from tests.integration.mock_ollama import DEFAULT_MODELS, create_mock_ollama

# --- fixtures ---------------------------------------------------------------


@dataclass(frozen=True, slots=True)
class IntegrationKey:
    """A test API key + the tenant it belongs to."""

    tenant_id: uuid.UUID
    tenant_name: str
    key_id: uuid.UUID
    full_key: str
    prefix: str


@dataclass(slots=True)
class IntegrationApp:
    """Built-app + driver bundle handed to integration tests."""

    app: FastAPI
    base_url: str
    settings: Settings
    engine: AsyncEngine
    sessionmaker: async_sessionmaker[Any]
    redis_url: str
    postgres_url: str
    hasher: PasswordHasher
    mock_upstream: FastAPI


# DDL for schema + enums + tables + indexes + trigger. This is the same SQL the
# alembic 0001 migration emits; we run it directly to avoid invoking the alembic
# CLI from the test process. Kept in sync with ``alembic/versions/0001_initial.py``.
_DDL_PATH_TO_MIGRATION = (
    "Built from db.models.Base.metadata + SPEC §5 trigger; see alembic 0001."
)


async def _create_schema_and_tables(engine: AsyncEngine) -> None:
    """Create the ``gateway`` schema, enums, tables, indexes, and trigger."""
    from neuronetz_gateway.db.models import GATEWAY_SCHEMA, Base

    async with engine.begin() as conn:
        await conn.execute(text(f'CREATE SCHEMA IF NOT EXISTS "{GATEWAY_SCHEMA}"'))
        # Create the three Postgres enums the models reference (create_type=False
        # on the columns means the metadata won't create them itself).
        for name, values in [
            ("key_status", ("active", "disabled", "revoked")),
            ("tenant_status", ("active", "suspended", "closed")),
            ("budget_period", ("day", "month", "total")),
        ]:
            values_sql = ", ".join(f"'{v}'" for v in values)
            await conn.execute(
                text(
                    f"""
                    DO $$ BEGIN
                        CREATE TYPE "{GATEWAY_SCHEMA}".{name} AS ENUM ({values_sql});
                    EXCEPTION WHEN duplicate_object THEN NULL;
                    END $$;
                    """
                )
            )
        await conn.run_sync(Base.metadata.create_all)
        # The NOTIFY trigger on gateway.revocations (SPEC §5).
        await conn.execute(
            text(
                f"""
                CREATE OR REPLACE FUNCTION "{GATEWAY_SCHEMA}".notify_key_revoked()
                RETURNS trigger AS $$
                BEGIN
                    PERFORM pg_notify('key_revoked', NEW.key_id::text);
                    RETURN NEW;
                END;
                $$ LANGUAGE plpgsql;
                """
            )
        )
        await conn.execute(
            text(
                f'DROP TRIGGER IF EXISTS trg_notify_key_revoked '
                f'ON "{GATEWAY_SCHEMA}".revocations'
            )
        )
        await conn.execute(
            text(
                f"""
                CREATE TRIGGER trg_notify_key_revoked
                    AFTER INSERT ON "{GATEWAY_SCHEMA}".revocations
                    FOR EACH ROW EXECUTE FUNCTION "{GATEWAY_SCHEMA}".notify_key_revoked()
                """
            )
        )


@pytest_asyncio.fixture()
async def integration_app(
    postgres_container: PostgresContainer,
    redis_container: RedisContainer,
    monkeypatch: pytest.MonkeyPatch,
) -> AsyncIterator[IntegrationApp]:
    """Wire up the full gateway app against real Postgres + Redis + mock Ollama."""
    # ---- URLs from the testcontainers (asyncpg driver for SQLAlchemy) ----
    pg_raw = postgres_container.get_connection_url()
    for prefix in ("postgresql+psycopg2://", "postgresql+psycopg://", "postgresql://"):
        if pg_raw.startswith(prefix):
            pg_url = "postgresql+asyncpg://" + pg_raw[len(prefix) :]
            break
    else:
        pg_url = pg_raw
    redis_host = redis_container.get_container_host_ip()
    redis_port = redis_container.get_exposed_port(6379)
    redis_url = f"redis://{redis_host}:{redis_port}/0"

    # ---- Settings env (cleared cache so create_app reads these) ----
    monkeypatch.setenv("DATABASE_URL", pg_url)
    monkeypatch.setenv("REDIS_URL", redis_url)
    monkeypatch.setenv("OLLAMA_BASE_URL", "http://ollama")  # any URL; overridden
    monkeypatch.setenv("GATEWAY_LOG_LEVEL", "WARNING")
    monkeypatch.setenv("ARGON2_TIME_COST", "1")
    monkeypatch.setenv("ARGON2_MEMORY_COST_KIB", "8")
    monkeypatch.setenv("ARGON2_PARALLELISM", "1")
    get_settings.cache_clear()
    settings = get_settings()

    # ---- Migrate schema directly (no alembic CLI needed). ----
    bootstrap_engine = create_async_engine(pg_url)
    await _create_schema_and_tables(bootstrap_engine)
    await bootstrap_engine.dispose()

    # ---- Build the app (its lifespan starts on first ASGI request). ----
    app = create_app(settings)

    # Override the upstream proxy to point at the in-process mock Ollama.
    mock_upstream = create_mock_ollama()
    transport = httpx.ASGITransport(app=mock_upstream)
    mock_http = httpx.AsyncClient(transport=transport, base_url="http://ollama")
    app.dependency_overrides[get_ollama_client] = lambda: OllamaClient(mock_http)

    # Force the discovery cache to be deterministic (mirrors the mock catalogue)
    # so model-allowlist checks resolve without depending on the background poll
    # racing the test. The lifespan will replace app.state.discovery_cache, so we
    # seed *after* startup. We do that via a startup hook injection below.

    base_url = "http://gateway"

    # ASGITransport does not drive the lifespan automatically; run it explicitly
    # so app.state is populated (hasher / discovery_cache / sessionmaker / etc.)
    # before any test traffic. Equivalent to what uvicorn does on startup.
    async with app.router.lifespan_context(app):
        # Seed the discovery cache so tests don't race the background poller.
        models = [DiscoveredModel(name=n, family=n.split(":", 1)[0]) for n in DEFAULT_MODELS]
        cache = app.state.discovery_cache
        await cache.set(models)

        # Sanity: hasher and sessionmaker were placed on app.state by lifespan.
        if getattr(app.state, "hasher", None) is None:
            pytest.skip("pending Backend: app.state.hasher not set by lifespan")
        if getattr(app.state, "db_sessionmaker", None) is None:
            pytest.skip("pending Backend: db_sessionmaker not set by lifespan")

        yield IntegrationApp(
            app=app,
            base_url=base_url,
            settings=settings,
            engine=app.state.db_engine,
            sessionmaker=app.state.db_sessionmaker,
            redis_url=redis_url,
            postgres_url=pg_url,
            hasher=app.state.hasher,
            mock_upstream=mock_upstream,
        )

    # Cleanup
    await mock_http.aclose()
    get_settings.cache_clear()


@pytest_asyncio.fixture()
async def client(integration_app: IntegrationApp) -> AsyncIterator[httpx.AsyncClient]:
    """An ASGI httpx client bound to the wired gateway app."""
    async with httpx.AsyncClient(
        transport=httpx.ASGITransport(app=integration_app.app),
        base_url=integration_app.base_url,
    ) as c:
        yield c


async def _create_tenant_and_key(
    integration_app: IntegrationApp,
    *,
    tenant_name: str | None = None,
    allow_all_models: bool = False,
    allowed_models: list[str] | None = None,
    tokens_daily: int | None = None,
    rpm: int = 60,
    tpm: int = 100_000,
) -> IntegrationKey:
    """Insert a tenant + API key directly via the repositories.

    Mirrors what the bootstrap CLI does, without invoking it. The full key is
    only available here in the test process — never logged or persisted.
    """
    name = tenant_name or f"acme-{secrets.token_hex(4)}"
    gen = generate_key()
    hasher = build_hasher(integration_app.settings)
    encoded = hash_secret(hasher, gen.full_key)

    async with integration_app.sessionmaker() as session:
        tenants = TenantRepository(session)
        tenant = await tenants.create(
            name=name, rpm=rpm, tpm=tpm, concurrent=8, allow_all_models=allow_all_models
        )
        if allowed_models is not None or allow_all_models:
            await tenants.set_models(
                tenant.id,
                allowed_models=allowed_models if allowed_models is not None else None,
                allow_all_models=allow_all_models,
            )
        keys_repo = ApiKeyRepository(session)
        key = await keys_repo.create(
            tenant_id=tenant.id,
            prefix=gen.prefix,
            key_hash=encoded,
            name="test-key",
            scopes=["chat", "embeddings"],
        )
        if tokens_daily is not None:
            klr = KeyLimitRepository(session)
            await klr.upsert_budget(
                key.id,
                tokens_daily=tokens_daily,
                tokens_monthly=None,
                tokens_total=None,
            )
        await session.commit()
        return IntegrationKey(
            tenant_id=tenant.id,
            tenant_name=name,
            key_id=key.id,
            full_key=gen.full_key,
            prefix=gen.prefix,
        )


@pytest_asyncio.fixture()
async def api_key(integration_app: IntegrationApp) -> IntegrationKey:
    """A default tenant + key with explicit access to the mock-catalogue models."""
    return await _create_tenant_and_key(
        integration_app,
        allowed_models=list(DEFAULT_MODELS),
        allow_all_models=False,
    )


@pytest_asyncio.fixture()
async def allow_all_key(integration_app: IntegrationApp) -> IntegrationKey:
    """A tenant with ``allow_all_models`` opted in."""
    return await _create_tenant_and_key(
        integration_app, allow_all_models=True, allowed_models=[]
    )


@pytest_asyncio.fixture()
async def restricted_key(integration_app: IntegrationApp) -> IntegrationKey:
    """A default-deny tenant whose allowlist only includes one mock model."""
    return await _create_tenant_and_key(
        integration_app,
        allow_all_models=False,
        allowed_models=["llama3.1:8b"],
    )


# Re-export the helper so individual tests can build extra keys without
# reaching back through pytest's fixture machinery.
__all__ = [
    "IntegrationApp",
    "IntegrationKey",
    "_create_tenant_and_key",
    "allow_all_key",
    "api_key",
    "client",
    "integration_app",
    "restricted_key",
]


# `asyncio` and `names_of` are imported above so that this module is self-
# contained for static analysers; suppress unused-import warnings in tests.
_ = (asyncio, names_of)