"""Tests for flow.core.platform."""

import os

import pytest

from flow.core.platform import PlatformInfo, detect_context, detect_platform


def test_platform_info_computes_platform_string():
    p = PlatformInfo(os="linux", arch="x64")
    assert p.platform == "linux-x64"


def test_detect_platform_returns_valid_info():
    info = detect_platform()
    assert info.os in ("linux", "macos")
    assert info.arch in ("x64", "arm64")
    assert info.platform == f"{info.os}-{info.arch}"


def test_detect_platform_raises_flow_error_on_unsupported(monkeypatch):
    from flow.core.errors import FlowError
    monkeypatch.setattr("platform.system", lambda: "FreeBSD")
    with pytest.raises(FlowError, match="Unsupported operating system"):
        detect_platform()


def test_detect_context_host(monkeypatch):
    monkeypatch.delenv("DF_NAMESPACE", raising=False)
    monkeypatch.delenv("DF_PLATFORM", raising=False)
    assert detect_context() == "host"


def test_detect_context_vm(monkeypatch):
    monkeypatch.setenv("DF_NAMESPACE", "personal")
    monkeypatch.setenv("DF_PLATFORM", "orb")
    assert detect_context() == "vm"