"""Tests for scan routes: trigger, pending devices, approve/hide/ignore, stop."""
import uuid
from unittest.mock import AsyncMock, patch

import pytest
from httpx import AsyncClient
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from app.db.models import Node, PendingDevice, ScanRun
from app.services.scanner import _cancelled_runs, request_cancel, run_scan


@pytest.fixture
async def headers(client: AsyncClient):
    res = await client.post("/api/v1/auth/login", json={"username": "admin", "password": "admin"})
    token = res.json()["access_token"]
    return {"Authorization": f"Bearer {token}"}


@pytest.fixture
async def pending_device(db_session):
    import uuid
    device = PendingDevice(
        id=str(uuid.uuid4()),
        ip="192.168.1.100",
        mac="aa:bb:cc:dd:ee:ff",
        hostname="my-server",
        os="Linux",
        services=[{"port": 22, "name": "ssh"}],
        suggested_type="server",
        status="pending",
    )
    db_session.add(device)
    await db_session.commit()
    await db_session.refresh(device)
    return device


# --- Trigger scan ---

@pytest.mark.asyncio
async def test_trigger_scan_requires_auth(client: AsyncClient):
    res = await client.post("/api/v1/scan/trigger")
    assert res.status_code == 401


@pytest.mark.asyncio
async def test_trigger_scan_creates_run(client: AsyncClient, headers):
    with (
        patch("app.api.routes.scan._background_scan", new_callable=AsyncMock),
        patch("app.api.routes.scan.settings") as mock_settings,
    ):
        mock_settings.scanner_ranges = ["192.168.1.0/24"]
        res = await client.post("/api/v1/scan/trigger", headers=headers)
    assert res.status_code == 200
    data = res.json()
    assert data["status"] == "running"
    assert data["ranges"] == ["192.168.1.0/24"]
    assert "id" in data


# --- Pending devices ---

@pytest.mark.asyncio
async def test_list_pending_empty(client: AsyncClient, headers):
    res = await client.get("/api/v1/scan/pending", headers=headers)
    assert res.status_code == 200
    assert res.json() == []


@pytest.mark.asyncio
async def test_list_pending_returns_device(client: AsyncClient, headers, pending_device):
    res = await client.get("/api/v1/scan/pending", headers=headers)
    assert res.status_code == 200
    data = res.json()
    assert len(data) == 1
    assert data[0]["ip"] == "192.168.1.100"
    assert data[0]["hostname"] == "my-server"


# --- Approve device ---

@pytest.mark.asyncio
async def test_approve_device(client: AsyncClient, headers, pending_device):
    node_payload = {
        "label": "My Server",
        "type": "server",
        "ip": "192.168.1.100",
        "hostname": "my-server",
        "status": "unknown",
        "services": [],
    }
    res = await client.post(
        f"/api/v1/scan/pending/{pending_device.id}/approve",
        json=node_payload,
        headers=headers,
    )
    assert res.status_code == 200
    data = res.json()
    assert data["approved"] is True
    assert "node_id" in data

    # Device should no longer appear in pending list
    pending_res = await client.get("/api/v1/scan/pending", headers=headers)
    assert pending_res.json() == []


@pytest.mark.asyncio
async def test_approve_nonexistent_device(client: AsyncClient, headers):
    node_payload = {
        "label": "Ghost",
        "type": "generic",
        "ip": "10.0.0.1",
        "status": "unknown",
        "services": [],
    }
    res = await client.post(
        "/api/v1/scan/pending/nonexistent-id/approve",
        json=node_payload,
        headers=headers,
    )
    assert res.status_code == 200
    assert res.json()["approved"] is False


# --- Hide device ---

@pytest.mark.asyncio
async def test_hide_device(client: AsyncClient, headers, pending_device):
    res = await client.post(f"/api/v1/scan/pending/{pending_device.id}/hide", headers=headers)
    assert res.status_code == 200
    assert res.json()["hidden"] is True

    # Should no longer appear in pending
    pending_res = await client.get("/api/v1/scan/pending", headers=headers)
    assert pending_res.json() == []

    # Should appear in hidden
    hidden_res = await client.get("/api/v1/scan/hidden", headers=headers)
    assert len(hidden_res.json()) == 1


# --- Ignore device ---

@pytest.mark.asyncio
async def test_ignore_device(client: AsyncClient, headers, pending_device):
    res = await client.post(f"/api/v1/scan/pending/{pending_device.id}/ignore", headers=headers)
    assert res.status_code == 200
    assert res.json()["ignored"] is True

    # Device should be gone from both pending and hidden
    pending_res = await client.get("/api/v1/scan/pending", headers=headers)
    assert pending_res.json() == []
    hidden_res = await client.get("/api/v1/scan/hidden", headers=headers)
    assert hidden_res.json() == []


# --- Scan runs ---

@pytest.mark.asyncio
async def test_list_runs_empty(client: AsyncClient, headers):
    res = await client.get("/api/v1/scan/runs", headers=headers)
    assert res.status_code == 200
    assert res.json() == []


# --- run_scan: re-scan updates existing pending devices ---

MOCK_HOST = {
    "ip": "192.168.1.50",
    "mac": "aa:bb:cc:dd:ee:ff",
    "hostname": "myhost.lan",
    "os": "Linux",
    "open_ports": [{"port": 8096, "protocol": "tcp", "banner": "Jellyfin"}],
}


@pytest.mark.asyncio
async def test_run_scan_creates_new_pending_device(db_session: AsyncSession):
    run_id = str(uuid.uuid4())
    run = ScanRun(id=run_id, status="running", ranges=["192.168.1.0/24"])
    db_session.add(run)
    await db_session.commit()

    with (
        patch("app.services.scanner._nmap_scan", return_value=[MOCK_HOST]),
        patch("app.api.routes.status.broadcast_scan_update", new_callable=AsyncMock),
    ):
        await run_scan(["192.168.1.0/24"], db_session, run_id)

    result = await db_session.execute(
        select(PendingDevice).where(PendingDevice.ip == "192.168.1.50")
    )
    device = result.scalar_one_or_none()
    assert device is not None
    assert device.hostname == "myhost.lan"
    assert any(s["port"] == 8096 for s in device.services)
    assert device.suggested_type == "server"


@pytest.mark.asyncio
async def test_run_scan_purges_stale_pending_for_canvas_nodes(db_session: AsyncSession):
    """Pending devices that were already in canvas before scan starts must be removed."""
    node = Node(
        id=str(uuid.uuid4()),
        label="Existing Server",
        type="server",
        ip="192.168.1.50",
        status="online",
        services=[],
        pos_x=0.0,
        pos_y=0.0,
    )
    stale = PendingDevice(
        id=str(uuid.uuid4()),
        ip="192.168.1.50",
        mac=None,
        hostname=None,
        os=None,
        services=[],
        suggested_type="generic",
        status="pending",
    )
    db_session.add(node)
    db_session.add(stale)
    await db_session.commit()

    run_id = str(uuid.uuid4())
    run = ScanRun(id=run_id, status="running", ranges=["192.168.1.0/24"])
    db_session.add(run)
    await db_session.commit()

    with (
        patch("app.services.scanner._nmap_scan", return_value=[]),
        patch("app.api.routes.status.broadcast_scan_update", new_callable=AsyncMock),
    ):
        await run_scan(["192.168.1.0/24"], db_session, run_id)

    result = await db_session.execute(
        select(PendingDevice).where(PendingDevice.ip == "192.168.1.50")
    )
    assert result.scalar_one_or_none() is None


@pytest.mark.asyncio
async def test_run_scan_skips_ip_already_in_canvas(db_session: AsyncSession):
    """Devices whose IP already exists as a canvas Node must not appear in pending."""
    node = Node(
        id=str(uuid.uuid4()),
        label="Existing Server",
        type="server",
        ip="192.168.1.50",
        status="online",
        services=[],
        pos_x=0.0,
        pos_y=0.0,
    )
    db_session.add(node)
    await db_session.commit()

    run_id = str(uuid.uuid4())
    run = ScanRun(id=run_id, status="running", ranges=["192.168.1.0/24"])
    db_session.add(run)
    await db_session.commit()

    with (
        patch("app.services.scanner._nmap_scan", return_value=[MOCK_HOST]),
        patch("app.api.routes.status.broadcast_scan_update", new_callable=AsyncMock),
    ):
        await run_scan(["192.168.1.0/24"], db_session, run_id)

    result = await db_session.execute(
        select(PendingDevice).where(PendingDevice.ip == "192.168.1.50")
    )
    assert result.scalar_one_or_none() is None


@pytest.mark.asyncio
async def test_run_scan_skips_hidden_device(db_session: AsyncSession):
    """Devices previously hidden by the user must not re-appear in pending on re-scan."""
    hidden = PendingDevice(
        id=str(uuid.uuid4()),
        ip="192.168.1.50",
        mac=None,
        hostname=None,
        os=None,
        services=[],
        suggested_type="generic",
        status="hidden",
    )
    db_session.add(hidden)
    await db_session.commit()

    run_id = str(uuid.uuid4())
    run = ScanRun(id=run_id, status="running", ranges=["192.168.1.0/24"])
    db_session.add(run)
    await db_session.commit()

    with (
        patch("app.services.scanner._nmap_scan", return_value=[MOCK_HOST]),
        patch("app.api.routes.status.broadcast_scan_update", new_callable=AsyncMock),
    ):
        await run_scan(["192.168.1.0/24"], db_session, run_id)

    result = await db_session.execute(
        select(PendingDevice).where(
            PendingDevice.ip == "192.168.1.50",
            PendingDevice.status == "pending",
        )
    )
    assert result.scalar_one_or_none() is None


# --- Stop scan ---

@pytest.mark.asyncio
async def test_stop_scan_requires_auth(client: AsyncClient):
    res = await client.post("/api/v1/scan/fake-id/stop")
    assert res.status_code == 401


@pytest.mark.asyncio
async def test_stop_scan_not_found(client: AsyncClient, headers):
    import uuid as _uuid
    res = await client.post(f"/api/v1/scan/{_uuid.uuid4()}/stop", headers=headers)
    assert res.status_code == 404


@pytest.mark.asyncio
async def test_stop_scan_not_running(client: AsyncClient, headers, db_session: AsyncSession):
    run = ScanRun(id=str(uuid.uuid4()), status="done", ranges=["192.168.1.0/24"])
    db_session.add(run)
    await db_session.commit()

    res = await client.post(f"/api/v1/scan/{run.id}/stop", headers=headers)
    assert res.status_code == 409


@pytest.mark.asyncio
async def test_stop_scan_success(client: AsyncClient, headers, db_session: AsyncSession):
    run = ScanRun(id=str(uuid.uuid4()), status="running", ranges=["192.168.1.0/24"])
    db_session.add(run)
    await db_session.commit()

    res = await client.post(f"/api/v1/scan/{run.id}/stop", headers=headers)
    assert res.status_code == 200
    assert res.json() == {"stopping": True}
    # run_id added to cancel set
    assert run.id in _cancelled_runs
    # cleanup for other tests
    _cancelled_runs.discard(run.id)


# --- run_scan cancellation ---

@pytest.mark.asyncio
async def test_run_scan_cancelled_marks_status(db_session: AsyncSession):
    """When cancel is requested before the scan starts, status becomes 'cancelled'."""
    run_id = str(uuid.uuid4())
    run = ScanRun(id=run_id, status="running", ranges=["192.168.1.0/24"])
    db_session.add(run)
    await db_session.commit()

    request_cancel(run_id)

    with (
        patch("app.services.scanner._nmap_scan", return_value=[MOCK_HOST]) as mock_nmap,
        patch("app.api.routes.status.broadcast_scan_update", new_callable=AsyncMock),
    ):
        await run_scan(["192.168.1.0/24"], db_session, run_id)
        # nmap should not have been called — cancelled before first range
        mock_nmap.assert_not_called()

    await db_session.refresh(run)
    assert run.status == "cancelled"
    assert run.finished_at is not None


@pytest.mark.asyncio
async def test_run_scan_cancelled_mid_scan_skips_remaining_cidrs(db_session: AsyncSession):
    """Cancel flag set after first CIDR is started prevents processing of the second CIDR."""
    run_id = str(uuid.uuid4())
    run = ScanRun(id=run_id, status="running", ranges=["10.0.0.0/24", "10.0.1.0/24"])
    db_session.add(run)
    await db_session.commit()

    call_count = 0

    def nmap_side_effect(target: str):
        nonlocal call_count
        call_count += 1
        # Signal cancellation after the first CIDR scan completes
        if call_count == 1:
            request_cancel(run_id)
        return []

    with (
        patch("app.services.scanner._nmap_scan", side_effect=nmap_side_effect),
        patch("app.api.routes.status.broadcast_scan_update", new_callable=AsyncMock),
    ):
        await run_scan(["10.0.0.0/24", "10.0.1.0/24"], db_session, run_id)

    assert call_count == 1  # second CIDR was skipped
    await db_session.refresh(run)
    assert run.status == "cancelled"


@pytest.mark.asyncio
async def test_run_scan_updates_existing_pending_device(db_session: AsyncSession):
    """Re-scanning the same IP updates services instead of creating a duplicate."""
    # Pre-existing pending device with no services
    existing = PendingDevice(
        id=str(uuid.uuid4()),
        ip="192.168.1.50",
        mac=None,
        hostname=None,
        os=None,
        services=[],
        suggested_type="generic",
        status="pending",
    )
    db_session.add(existing)
    await db_session.commit()

    run_id = str(uuid.uuid4())
    run = ScanRun(id=run_id, status="running", ranges=["192.168.1.0/24"])
    db_session.add(run)
    await db_session.commit()

    with (
        patch("app.services.scanner._nmap_scan", return_value=[MOCK_HOST]),
        patch("app.api.routes.status.broadcast_scan_update", new_callable=AsyncMock),
    ):
        await run_scan(["192.168.1.0/24"], db_session, run_id)

    # Should still be only one device
    result = await db_session.execute(
        select(PendingDevice).where(PendingDevice.ip == "192.168.1.50")
    )
    devices = list(result.scalars().all())
    assert len(devices) == 1
    device = devices[0]
    # Services and hostname should be updated
    assert device.hostname == "myhost.lan"
    assert any(s["port"] == 8096 for s in device.services)