import sys
from io import StringIO
from pathlib import Path

from l4d2host.instances import initialize_instance, _emit_step


def test_initialize_writes_files(tmp_path: Path) -> None:
    spec = tmp_path / "spec.yaml"
    spec.write_text("port: 27015\noverlays: [a,b]\nconfig: ['sv_consistency 1']\n")

    initialize_instance("alpha", spec, root=tmp_path)

    assert (tmp_path / "instances/alpha/instance.env").exists()
    assert (tmp_path / "instances/alpha/server.cfg").exists()


def test_empty_config_writes_empty_server_cfg(tmp_path: Path) -> None:
    spec = tmp_path / "spec.yaml"
    spec.write_text("port: 27015\n")

    initialize_instance("alpha", spec, root=tmp_path)

    assert (tmp_path / "instances/alpha/server.cfg").read_text() == ""


def test_initialize_uses_configured_left4me_root(tmp_path: Path, monkeypatch) -> None:
    monkeypatch.setenv("LEFT4ME_ROOT", str(tmp_path))
    spec = tmp_path / "spec.yaml"
    spec.write_text("port: 27015\noverlays: [standard]\n")

    initialize_instance("alpha", spec)

    env = (tmp_path / "instances/alpha/instance.env").read_text()
    assert f"L4D2_LOWERDIRS={tmp_path}/overlays/standard:{tmp_path}/installation" in env


def test_emit_step_uses_callback() -> None:
    calls: list[str] = []
    _emit_step("test step", on_stdout=calls.append, passthrough=False)
    assert calls == ["Step: test step"]


def test_emit_step_uses_passthrough_stdout(monkeypatch) -> None:
    fake_out = StringIO()
    monkeypatch.setattr(sys, "stdout", fake_out)
    _emit_step("passthrough step", on_stdout=None, passthrough=True)
    assert fake_out.getvalue() == "Step: passthrough step\n"


def test_emit_step_does_nothing_if_no_target() -> None:
    _emit_step("silent step", on_stdout=None, passthrough=False)