import importlib.util
import subprocess
import sys
from pathlib import Path
from types import SimpleNamespace

import pytest

spec = importlib.util.spec_from_file_location(
    "runtime_smoke", Path(__file__).parents[1] / "scripts/smoke-bwrap-runtime.py"
)
smoke = importlib.util.module_from_spec(spec)
spec.loader.exec_module(smoke)
namespace = {"subprocess": subprocess, "Path": Path}
exec(smoke.ENTRYPOINT_PROBE, namespace)
started = namespace["entrypoint_started"]
inside = namespace["package_inside_runtime"]


def launcher(tmp_path, body):
    runtime = tmp_path / "relocated runtime"
    (runtime / "bin").mkdir(parents=True)
    entry = runtime / "bin/glas-harness"
    entry.write_text(f"#!{sys.executable}\n{body}\n")
    entry.chmod(0o755)
    return runtime, entry


def test_real_relocated_launcher_help_starts(tmp_path):
    runtime, _ = launcher(tmp_path, "print('Usage: glas-harness [options]')")
    assert started(runtime, "glas-harness")


@pytest.mark.parametrize("body", [
    "print('not command help')",
    "import sys; print('usage: fixture'); sys.exit(127)",
    "import sys; print('stderr-canary', file=sys.stderr); sys.exit(1)",
])
def test_failed_or_non_help_launcher_is_not_evidence(tmp_path, body, capsys):
    runtime, _ = launcher(tmp_path, body)
    assert not started(runtime, "glas-harness")
    assert capsys.readouterr() == ("", "")


def test_vanished_build_interpreter_and_missing_launcher_refuse(tmp_path):
    runtime, entry = launcher(tmp_path, "print('usage: fixture')")
    entry.write_text("#!/bin/sh\nexec /vanished/build/bin/python3 -c 'print(1)'\n")
    assert not started(runtime, "glas-harness")
    assert not started(runtime, "rein-aharness")


def test_launcher_timeout_is_not_startup_success(tmp_path):
    runtime, _ = launcher(tmp_path, "import time; time.sleep(10)")
    assert not started(runtime, "glas-harness", timeout=0.05)


def test_external_symlink_launcher_refuses_even_if_help_succeeds(tmp_path):
    runtime, entry = launcher(tmp_path, "print('usage: fixture')")
    external = tmp_path / "external"
    entry.rename(external)
    entry.symlink_to(external)
    assert not started(runtime, "glas-harness")


def test_package_provenance_rejects_external_and_symlink_origins(tmp_path):
    runtime = tmp_path / "runtime"
    runtime.mkdir()
    installed = runtime / "package.py"
    installed.write_text("")
    assert inside(SimpleNamespace(__file__=str(installed)), runtime)
    external = tmp_path / "external.py"
    external.write_text("")
    installed.unlink()
    installed.symlink_to(external)
    assert not inside(SimpleNamespace(__file__=str(installed)), runtime)
    assert not inside(SimpleNamespace(__file__=str(external)), runtime)
    assert not inside(SimpleNamespace(), runtime)