"""Tests for status_checker service: each check method."""
from unittest.mock import AsyncMock, MagicMock, patch

import pytest

from app.services.status_checker import _ping, _tcp_connect, check_node

# --- check_node dispatcher ---

@pytest.mark.asyncio
async def test_check_node_none_always_online():
    result = await check_node("none", None, None)
    assert result["status"] == "online"
    assert result["response_time_ms"] is None


@pytest.mark.asyncio
async def test_check_node_none_always_online_ignores_host():
    """'none' returns online immediately without any network call."""
    with patch("app.services.status_checker._ping", new_callable=AsyncMock) as mock_ping:
        result = await check_node("none", None, "192.168.1.1")
    mock_ping.assert_not_called()
    assert result["status"] == "online"


@pytest.mark.asyncio
async def test_check_node_unknown_without_host():
    result = await check_node("ping", None, None)
    assert result["status"] == "unknown"
    assert result["response_time_ms"] is None


@pytest.mark.asyncio
async def test_check_node_ping_online():
    with patch("app.services.status_checker._ping", new_callable=AsyncMock, return_value=True):
        result = await check_node("ping", None, "192.168.1.1")
    assert result["status"] == "online"
    assert result["response_time_ms"] is not None


@pytest.mark.asyncio
async def test_check_node_ping_offline():
    with patch("app.services.status_checker._ping", new_callable=AsyncMock, return_value=False):
        result = await check_node("ping", None, "192.168.1.1")
    assert result["status"] == "offline"


@pytest.mark.asyncio
async def test_check_node_http_online():
    with patch("app.services.status_checker._http_get", new_callable=AsyncMock, return_value=True):
        result = await check_node("http", "192.168.1.1:8080", None)
    assert result["status"] == "online"


@pytest.mark.asyncio
async def test_check_node_http_prepends_scheme():
    """If target doesn't start with http, http:// is prepended."""
    captured = {}

    async def fake_http_get(url, verify=False):
        captured["url"] = url
        return True

    with patch("app.services.status_checker._http_get", side_effect=fake_http_get):
        await check_node("http", "192.168.1.1:8080", None)

    assert captured["url"].startswith("http://")


@pytest.mark.asyncio
async def test_check_node_https_uses_verify():
    captured = {}

    async def fake_http_get(url, verify=False):
        captured["verify"] = verify
        return True

    with patch("app.services.status_checker._http_get", side_effect=fake_http_get):
        await check_node("https", "https://myserver", None)

    assert captured["verify"] is True


@pytest.mark.asyncio
async def test_check_node_ssh():
    with patch("app.services.status_checker._tcp_connect", new_callable=AsyncMock, return_value=True) as mock_tcp:
        result = await check_node("ssh", None, "192.168.1.5")
    mock_tcp.assert_called_once_with("192.168.1.5", 22)
    assert result["status"] == "online"


@pytest.mark.asyncio
async def test_check_node_tcp_parses_port():
    captured = {}

    async def fake_tcp(host, port):
        captured["host"] = host
        captured["port"] = port
        return True

    with patch("app.services.status_checker._tcp_connect", side_effect=fake_tcp):
        await check_node("tcp", "192.168.1.10:9090", None)

    assert captured["host"] == "192.168.1.10"
    assert captured["port"] == 9090


@pytest.mark.asyncio
async def test_check_node_prometheus_appends_metrics():
    captured = {}

    async def fake_http_get(url, verify=False):
        captured["url"] = url
        return True

    with patch("app.services.status_checker._http_get", side_effect=fake_http_get):
        await check_node("prometheus", "192.168.1.10:9090", None)

    assert "/metrics" in captured["url"]


@pytest.mark.asyncio
async def test_check_node_health_appends_health():
    captured = {}

    async def fake_http_get(url, verify=False):
        captured["url"] = url
        return True

    with patch("app.services.status_checker._http_get", side_effect=fake_http_get):
        await check_node("health", "192.168.1.10:8080", None)

    assert "/health" in captured["url"]


@pytest.mark.asyncio
async def test_check_node_unknown_method_falls_back_to_ping():
    with patch("app.services.status_checker._ping", new_callable=AsyncMock, return_value=True) as mock_ping:
        result = await check_node("foobar", None, "10.0.0.1")
    mock_ping.assert_called_once()
    assert result["status"] == "online"


@pytest.mark.asyncio
async def test_check_node_exception_returns_offline():
    with patch("app.services.status_checker._ping", new_callable=AsyncMock, side_effect=RuntimeError("boom")):
        result = await check_node("ping", None, "10.0.0.1")
    assert result["status"] == "offline"
    assert result["response_time_ms"] is None


# --- _ping platform args ---

@pytest.mark.asyncio
async def test_ping_uses_unix_args_on_non_windows():
    captured = {}

    async def fake_exec(*args, **kwargs):
        captured["args"] = args
        proc = MagicMock()
        proc.returncode = 0
        proc.wait = AsyncMock()
        return proc

    with patch("app.services.status_checker.sys.platform", "linux"), \
         patch("asyncio.create_subprocess_exec", side_effect=fake_exec):
        await _ping("192.168.1.1")

    assert "-c" in captured["args"]
    assert "-W" in captured["args"]
    assert "-n" not in captured["args"]
    # Linux: -W is in seconds; 1s is the intended timeout
    w_idx = captured["args"].index("-W")
    assert captured["args"][w_idx + 1] == "1"


@pytest.mark.asyncio
async def test_ping_uses_macos_millisecond_timeout():
    """macOS ping(8) -W is milliseconds, not seconds. 1ms would fail any RTT >1ms."""
    captured = {}

    async def fake_exec(*args, **kwargs):
        captured["args"] = args
        proc = MagicMock()
        proc.returncode = 0
        proc.wait = AsyncMock()
        return proc

    with patch("app.services.status_checker.sys.platform", "darwin"), \
         patch("asyncio.create_subprocess_exec", side_effect=fake_exec):
        await _ping("192.168.1.1")

    assert "-c" in captured["args"]
    assert "-W" in captured["args"]
    w_idx = captured["args"].index("-W")
    assert captured["args"][w_idx + 1] == "1000"


@pytest.mark.asyncio
async def test_ping_uses_windows_args_on_win32():
    captured = {}

    async def fake_exec(*args, **kwargs):
        captured["args"] = args
        proc = MagicMock()
        proc.returncode = 0
        proc.wait = AsyncMock()
        return proc

    with patch("app.services.status_checker.sys.platform", "win32"), \
         patch("asyncio.create_subprocess_exec", side_effect=fake_exec):
        await _ping("192.168.1.1")

    assert "-n" in captured["args"]
    assert "-w" in captured["args"]
    assert "-c" not in captured["args"]


# --- _tcp_connect ---

@pytest.mark.asyncio
async def test_tcp_connect_success():
    writer_mock = MagicMock()
    writer_mock.close = MagicMock()
    writer_mock.wait_closed = AsyncMock()
    with patch("asyncio.open_connection", new_callable=AsyncMock, return_value=(MagicMock(), writer_mock)):
        result = await _tcp_connect("192.168.1.1", 22)
    assert result is True


@pytest.mark.asyncio
async def test_tcp_connect_timeout():
    async def timeout_open(*args, **kwargs):
        raise TimeoutError()

    with patch("asyncio.open_connection", side_effect=timeout_open):
        result = await _tcp_connect("192.168.1.1", 22)
    assert result is False


@pytest.mark.asyncio
async def test_tcp_connect_os_error():
    with patch("asyncio.open_connection", new_callable=AsyncMock, side_effect=OSError("refused")):
        result = await _tcp_connect("192.168.1.1", 9999)
    assert result is False