"""Host inventory ingest and API."""

import uuid
from datetime import datetime, timezone

from sqlalchemy import select

from app.models import Event, Host
from app.services.host_inventory import diff_hardware, hardware_snapshot, inventory_fingerprint


def test_hardware_diff_detects_memory_change():
    old = {"memory_gb": 16.0, "processor": [{"name": "CPU A", "cores": 4, "logical_processors": 8}]}
    new = {"memory_gb": 32.0, "processor": [{"name": "CPU A", "cores": 4, "logical_processors": 8}]}
    changes = diff_hardware(old, new)
    assert len(changes) == 1
    assert changes[0]["field"] == "memory_gb"


def test_hardware_diff_ignores_first_snapshot():
    new = {"memory_gb": 16.0}
    assert diff_hardware(None, new) == []


def test_ingest_inventory_stores_host_and_info(client, auth_headers, db_session):
    event_id = str(uuid.uuid4())
    payload = {
        "schema_version": "1.0",
        "event_id": event_id,
        "occurred_at": "2026-06-04T10:00:00+03:00",
        "source": {"product": "rdp-login-monitor", "product_version": "2.0.21-SAC"},
        "host": {"hostname": "inv-pc", "os_family": "windows"},
        "category": "agent",
        "type": "agent.inventory",
        "severity": "info",
        "title": "Host inventory",
        "summary": "Inventory snapshot",
        "details": {
            "inventory": {
                "schema_version": 1,
                "computer_name": "INV-PC",
                "memory_gb": 32.0,
                "processor": [{"name": "Intel Xeon", "cores": 8, "logical_processors": 16}],
                "windows": {"product_name": "Windows Server 2019", "version": "1809"},
            }
        },
    }
    r = client.post("/api/v1/events", json=payload, headers=auth_headers)
    assert r.status_code == 201

    host = db_session.scalar(select(Host).where(Host.hostname == "inv-pc"))
    assert host is not None
    assert host.inventory is not None
    assert host.inventory["memory_gb"] == 32.0
    assert host.inventory_updated_at is not None
    assert host.os_version == "Windows Server 2019 (1809)"


def test_ingest_inventory_hardware_change_warning(client, auth_headers, db_session):
    base = {
        "schema_version": "1.0",
        "occurred_at": "2026-06-04T10:00:00+03:00",
        "source": {"product": "rdp-login-monitor", "product_version": "2.0.21-SAC"},
        "host": {"hostname": "inv-change", "os_family": "windows"},
        "category": "agent",
        "type": "agent.inventory",
        "severity": "info",
        "title": "Host inventory",
        "summary": "Inventory snapshot",
    }
    inv_v1 = {
        "inventory": {
            "memory_gb": 16.0,
            "processor": [{"name": "CPU A", "cores": 4, "logical_processors": 8}],
            "disks": [{"friendly_name": "Disk0", "media_type": "SSD", "size_gb": 500.0}],
        }
    }
    assert (
        client.post(
            "/api/v1/events",
            json={**base, "event_id": str(uuid.uuid4()), "details": inv_v1},
            headers=auth_headers,
        ).status_code
        == 201
    )

    inv_v2 = {
        "inventory": {
            "memory_gb": 32.0,
            "processor": [{"name": "CPU A", "cores": 4, "logical_processors": 8}],
            "disks": [{"friendly_name": "Disk0", "media_type": "SSD", "size_gb": 500.0}],
        }
    }
    r = client.post(
        "/api/v1/events",
        json={**base, "event_id": str(uuid.uuid4()), "details": inv_v2},
        headers=auth_headers,
    )
    assert r.status_code == 201

    ev = db_session.scalar(select(Event).order_by(Event.id.desc()))
    assert ev is not None
    assert ev.severity == "warning"
    assert ev.details.get("hardware_changes")


def test_get_host_detail(client, db_session, jwt_headers):
    h = Host(
        hostname="detail-host",
        display_name="Detail Host",
        os_family="windows",
        product="rdp-login-monitor",
        product_version="2.0.21-SAC",
        inventory={"memory_gb": 64.0},
        inventory_updated_at=datetime.now(timezone.utc),
        last_seen_at=datetime.now(timezone.utc),
    )
    db_session.add(h)
    db_session.commit()

    r = client.get(f"/api/v1/hosts/{h.id}", headers=jwt_headers)
    assert r.status_code == 200
    body = r.json()
    assert body["hostname"] == "detail-host"
    assert body["inventory"]["memory_gb"] == 64.0
    assert body["last_inventory_at"] is not None


def test_inventory_fingerprint_stable():
    inv = {"memory_gb": 16.0, "processor": [{"name": "X", "cores": 2, "logical_processors": 4}]}
    assert inventory_fingerprint(inv) == inventory_fingerprint(inv)
    assert hardware_snapshot(inv)["memory_gb"] == 16.0