"""Regression tests for cross-platform helper behavior."""

import importlib.util
import io
import sys
from pathlib import Path


_MODULE_PATH = Path(__file__).resolve().parents[1] / "core" / "platform_compat.py"
_SPEC = importlib.util.spec_from_file_location("platform_compat_under_test", _MODULE_PATH)
platform_compat = importlib.util.module_from_spec(_SPEC)
assert _SPEC and _SPEC.loader
_SPEC.loader.exec_module(platform_compat)


def _reset_bash_cache(monkeypatch):
    monkeypatch.setattr(platform_compat, "_BASH_CACHE", None)
    monkeypatch.setattr(platform_compat, "_BASH_PROBED", False)


def test_find_bash_tries_windows_exe_suffix(monkeypatch):
    _reset_bash_cache(monkeypatch)
    monkeypatch.setattr(platform_compat, "IS_WINDOWS", True)

    expected = r"C:\Program Files\Git\bin\bash.exe"

    def fake_which(name):
        return expected if name == "bash.exe" else None

    monkeypatch.setattr(platform_compat.shutil, "which", fake_which)
    monkeypatch.setattr(platform_compat.os.path, "exists", lambda _path: False)

    assert platform_compat.find_bash() == expected


def test_find_bash_checks_local_app_data_git_install(monkeypatch):
    _reset_bash_cache(monkeypatch)
    monkeypatch.setattr(platform_compat, "IS_WINDOWS", True)
    monkeypatch.setattr(platform_compat.shutil, "which", lambda _name: None)
    for env_name in platform_compat._WINDOWS_BASH_ROOT_ENV_VARS:
        monkeypatch.delenv(env_name, raising=False)
    monkeypatch.setenv("LocalAppData", r"C:\Users\alice\AppData\Local")

    expected = r"C:\Users\alice\AppData\Local\Git\bin\bash.exe"
    monkeypatch.setattr(platform_compat.os.path, "exists", lambda path: path == expected)

    assert platform_compat.find_bash() == expected


def test_find_bash_checks_local_app_data_programs_git_install(monkeypatch):
    _reset_bash_cache(monkeypatch)
    monkeypatch.setattr(platform_compat, "IS_WINDOWS", True)
    monkeypatch.setattr(platform_compat.shutil, "which", lambda _name: None)
    for env_name in platform_compat._WINDOWS_BASH_ROOT_ENV_VARS:
        monkeypatch.delenv(env_name, raising=False)
    monkeypatch.setenv("LocalAppData", r"C:\Users\alice\AppData\Local")

    expected = r"C:\Users\alice\AppData\Local\Programs\Git\bin\bash.exe"
    monkeypatch.setattr(platform_compat.os.path, "exists", lambda path: path == expected)

    assert platform_compat.find_bash() == expected


def test_find_bash_skips_windows_wsl_stub(monkeypatch):
    _reset_bash_cache(monkeypatch)
    monkeypatch.setattr(platform_compat, "IS_WINDOWS", True)

    stub = r"C:\WINDOWS\system32\bash.exe"
    expected = r"C:\Program Files\Git\bin\bash.exe"
    monkeypatch.setattr(
        platform_compat.shutil,
        "which",
        lambda name: stub if name == "bash" else None,
    )
    monkeypatch.setattr(platform_compat.os.path, "exists", lambda path: path == expected)

    assert platform_compat.find_bash() == expected


def test_is_wsl_true_when_proc_version_mentions_microsoft(monkeypatch):
    monkeypatch.setattr(sys, "platform", "linux", raising=False)

    def fake_open(path, mode="r", *args, **kwargs):
        assert path == "/proc/version"
        assert mode == "r"
        assert kwargs == {"encoding": "utf-8", "errors": "ignore"}
        return io.StringIO("Linux version 6.6.0 microsoft standard")

    monkeypatch.setattr("builtins.open", fake_open)

    assert platform_compat.is_wsl() is True


def test_is_wsl_false_when_proc_version_is_not_microsoft(monkeypatch):
    monkeypatch.setattr(sys, "platform", "linux", raising=False)
    monkeypatch.setattr("builtins.open", lambda *_a, **_k: io.StringIO("Linux version 6.6.0 generic"))

    assert platform_compat.is_wsl() is False


def test_is_wsl_false_on_non_posix_without_proc_probe(monkeypatch):
    monkeypatch.setattr(sys, "platform", "win32", raising=False)
    monkeypatch.setattr(platform_compat.os, "name", "nt", raising=False)

    def fail_open(*_args, **_kwargs):
        raise AssertionError("open should not be called when platform is not Linux/POSIX")

    monkeypatch.setattr("builtins.open", fail_open)

    assert platform_compat.is_wsl() is False


def test_translate_path_converts_windows_drive_path_on_wsl(monkeypatch):
    monkeypatch.setattr(platform_compat, "is_wsl", lambda: True)

    out = platform_compat.translate_path(r"C:\Users\alice\models\qwen.gguf")

    assert out == "/mnt/c/Users/alice/models/qwen.gguf"


def test_translate_path_resolves_paths_when_not_wsl(monkeypatch):
    monkeypatch.setattr(platform_compat, "is_wsl", lambda: False)

    assert platform_compat.translate_path(".") == str(Path(".").resolve())


def test_translate_path_returns_input_when_resolve_fails(monkeypatch):
    monkeypatch.setattr(platform_compat, "is_wsl", lambda: False)

    class _BrokenPath:
        def __init__(self, _value):
            pass

        def resolve(self):
            raise RuntimeError("boom")

    monkeypatch.setattr(platform_compat, "Path", _BrokenPath)

    assert platform_compat.translate_path("weird::path") == "weird::path"


def test_get_wsl_windows_user_profile_prefers_powershell(monkeypatch):
    monkeypatch.setattr(platform_compat, "is_wsl", lambda: True)

    class _Result:
        returncode = 0
        stdout = "C:\\Users\\alice\\n"

    monkeypatch.setattr(platform_compat.subprocess, "run", lambda *_a, **_k: _Result())
    monkeypatch.setattr(platform_compat, "translate_path", lambda _v: "/mnt/c/Users/alice")

    assert platform_compat.get_wsl_windows_user_profile() == "/mnt/c/Users/alice"


def test_get_wsl_windows_user_profile_falls_back_to_users_dir(monkeypatch):
    import os
    monkeypatch.setattr(platform_compat, "is_wsl", lambda: True)

    def raise_run(*_a, **_k):
        raise OSError("powershell unavailable")

    monkeypatch.setattr(platform_compat.subprocess, "run", raise_run)
    monkeypatch.setattr(
        platform_compat.os,
        "listdir",
        lambda _path: ["All Users", "Default", "Public", "alice"],
    )

    def fake_isdir(path):
        return os.path.normpath(path) in {
            os.path.normpath("/mnt/c/Users"),
            os.path.normpath("/mnt/c/Users/alice")
        }

    monkeypatch.setattr(platform_compat.os.path, "isdir", fake_isdir)

    assert platform_compat.get_wsl_windows_user_profile() == os.path.join("/mnt/c/Users", "alice")


def test_get_wsl_windows_user_profile_returns_none_when_nothing_found(monkeypatch):
    monkeypatch.setattr(platform_compat, "is_wsl", lambda: True)
    monkeypatch.setattr(
        platform_compat.subprocess,
        "run",
        lambda *_a, **_k: (_ for _ in ()).throw(OSError("powershell unavailable")),
    )
    monkeypatch.setattr(platform_compat.os.path, "isdir", lambda _path: False)

    assert platform_compat.get_wsl_windows_user_profile() is None


def test_nvidia_path_override_is_correct_string(monkeypatch):
    monkeypatch.setattr(platform_compat, "_SSH_PATH_MEMBERS", ["path1", "path2"])
    assert platform_compat._ssh_path_override() == "export PATH=\"$PATH:path1:path2\"; "


def test_windows_powershell_argv_defaults_include_no_profile_and_noninteractive():
    argv = platform_compat._windows_powershell_argv("Write-Output Hello")
    assert argv == [
        "powershell.exe",
        "-NoProfile",
        "-NonInteractive",
        "-Command",
        "Write-Output Hello",
    ]


def test_windows_powershell_argv_respects_disabled_flags():
    argv = platform_compat._windows_powershell_argv(
        "Write-Output Hello",
        no_profile=False,
        non_interactive=False,
    )
    assert argv == ["powershell.exe", "-Command", "Write-Output Hello"]


def test_run_wsl_windows_powershell_raises_outside_wsl(monkeypatch):
    monkeypatch.setattr(platform_compat, "is_wsl", lambda: False)
    try:
        platform_compat.run_wsl_windows_powershell("Write-Output Hello", timeout=2)
        raise AssertionError("Expected RuntimeError")
    except RuntimeError as exc:
        assert "only supported in WSL" in str(exc)


def test_run_wsl_windows_powershell_calls_subprocess_with_expected_argv(monkeypatch):
    monkeypatch.setattr(platform_compat, "is_wsl", lambda: True)
    captured = {}

    class _Result:
        returncode = 0
        stdout = "ok\n"
        stderr = ""

    def _fake_run(args, **kwargs):
        captured["args"] = list(args)
        captured["kwargs"] = kwargs
        return _Result()

    monkeypatch.setattr(platform_compat.subprocess, "run", _fake_run)

    result = platform_compat.run_wsl_windows_powershell("Write-Output Hello", timeout=9)

    assert result.returncode == 0
    assert captured["args"] == [
        "powershell.exe",
        "-NoProfile",
        "-NonInteractive",
        "-Command",
        "Write-Output Hello",
    ]
    assert captured["kwargs"]["capture_output"] is True
    assert captured["kwargs"]["text"] is True
    assert captured["kwargs"]["timeout"] == 9


def test_ssh_exec_argv_builds_default_command():
    argv = platform_compat._ssh_exec_argv("alice@gpu-box", None, remote_cmd="echo ok")
    assert argv == ["ssh", "alice@gpu-box", "echo ok"]


def test_ssh_exec_argv_includes_port_and_options():
    argv = platform_compat._ssh_exec_argv(
        "alice@gpu-box",
        "2222",
        remote_cmd="tmux ls",
        connect_timeout=6,
        strict_host_key_checking=False,
    )
    assert argv == [
        "ssh",
        "-o",
        "ConnectTimeout=6",
        "-o",
        "StrictHostKeyChecking=no",
        "-p",
        "2222",
        "alice@gpu-box",
        "tmux ls",
    ]


def test_run_ssh_command_uses_built_argv(monkeypatch):
    captured = {}

    class _Result:
        returncode = 0
        stdout = "ok"
        stderr = ""

    def _fake_run(args, **kwargs):
        captured["args"] = list(args)
        captured["kwargs"] = kwargs
        return _Result()

    monkeypatch.setattr(platform_compat.subprocess, "run", _fake_run)

    result = platform_compat.run_ssh_command(
        "alice@gpu-box",
        "2200",
        "tmux ls",
        timeout=7,
        connect_timeout=3,
        strict_host_key_checking=True,
        text=False,
    )

    assert result.returncode == 0
    assert captured["args"] == [
        "ssh",
        "-o",
        "ConnectTimeout=3",
        "-o",
        "StrictHostKeyChecking=yes",
        "-p",
        "2200",
        "alice@gpu-box",
        "tmux ls",
    ]
    assert captured["kwargs"]["timeout"] == 7
    assert captured["kwargs"]["capture_output"] is True
    assert captured["kwargs"]["text"] is False