"""Integration: per-host Docker schema + host-scoped persistence.

Validates the docker_002 migration (host_id columns + composite key) applied and
that persist_host_docker scopes containers/metrics by host so same-named
containers on different hosts no longer collide. Requires STEWARD_DATABASE_URL.
"""
from __future__ import annotations

import asyncio
import os
import uuid
from datetime import datetime, timezone

import pytest

pytestmark = pytest.mark.integration

_NEEDS_DB = pytest.mark.skipif(
    not os.environ.get("STEWARD_DATABASE_URL"),
    reason="integration test needs a live Postgres (STEWARD_DATABASE_URL)",
)


@pytest.fixture
def app():
    if not os.environ.get("STEWARD_DATABASE_URL"):
        pytest.skip("needs Postgres")
    from steward.app import create_app
    return create_app(testing=False)


@_NEEDS_DB
def test_docker_tables_are_host_scoped(app):
    from sqlalchemy import text

    async def _go():
        async with app.db_sessionmaker() as s:
            # Both tables carry a host_id column after docker_002.
            for tbl in ("docker_containers", "docker_metrics"):
                cols = {r[0] for r in (await s.execute(text(
                    "SELECT column_name FROM information_schema.columns "
                    "WHERE table_name = :t"), {"t": tbl})).all()}
                assert "host_id" in cols, f"{tbl} missing host_id"
            # docker_containers is keyed by (host_id, name), not name alone.
            pk_cols = {r[0] for r in (await s.execute(text(
                "SELECT a.attname FROM pg_index i "
                "JOIN pg_attribute a ON a.attrelid = i.indrelid "
                " AND a.attnum = ANY(i.indkey) "
                "WHERE i.indrelid = 'docker_containers'::regclass AND i.indisprimary"
            ))).all()}
            assert pk_cols == {"host_id", "name"}

    asyncio.run(_go())


def _persist_fn(app):
    """Resolve persist_host_docker via the registered capability if the docker
    plugin is loaded, else import it directly (the import is safe only when the
    plugin is NOT loaded — otherwise its models are already mapped)."""
    from steward.core.capabilities import has_capability, get_capability
    if has_capability("docker.persist_host_samples"):
        return get_capability("docker.persist_host_samples").fn
    from plugins.docker.ingest import persist_host_docker
    return persist_host_docker


@_NEEDS_DB
def test_persist_scopes_containers_by_host(app):
    from sqlalchemy import text
    from steward.models.hosts import Host

    persist = _persist_fn(app)
    now = datetime.now(timezone.utc)
    snapshot = [(now, [{
        "name": "web", "container_id": "abc123", "image": "nginx",
        "status": "running", "cpu_pct": 12.5, "mem_pct": 30.0,
        "mem_usage_bytes": 100, "mem_limit_bytes": 200, "ports": [], "started_at": None,
    }])]

    async def _go():
        async with app.db_sessionmaker() as s:
            async with s.begin():
                await s.execute(text("DELETE FROM docker_metrics"))
                await s.execute(text("DELETE FROM docker_containers"))
                await s.execute(text(
                    "DELETE FROM plugin_metrics WHERE source_module = 'docker'"))
                h1 = Host(id=str(uuid.uuid4()), name="alpha", address="10.0.0.1")
                h2 = Host(id=str(uuid.uuid4()), name="beta", address="10.0.0.2")
                s.add_all([h1, h2])
                await s.flush()
                # Same container name on two hosts — must not collide now.
                await persist(s, h1, snapshot)
                await persist(s, h2, snapshot)

            web_rows = (await s.execute(text(
                "SELECT COUNT(*) FROM docker_containers WHERE name = 'web'"))).scalar()
            metric_hosts = (await s.execute(text(
                "SELECT COUNT(DISTINCT host_id) FROM docker_metrics "
                "WHERE container_name = 'web'"))).scalar()
            # Alert pipeline received host-scoped resource names.
            resources = {r[0] for r in (await s.execute(text(
                "SELECT DISTINCT resource_name FROM plugin_metrics "
                "WHERE source_module = 'docker'"))).all()}
            return web_rows, metric_hosts, resources

    web_rows, metric_hosts, resources = asyncio.run(_go())
    assert web_rows == 2          # one 'web' per host, keyed by (host_id, name)
    assert metric_hosts == 2      # time-series rows scoped per host
    assert resources == {"alpha/web", "beta/web"}