import contextlib
import platform as platform_module
import subprocess
import sys
from pathlib import Path

import pytest

from cibuildwheel import linux, macos, util, windows


class ArgsInterceptor:
    def __call__(self, *args, **kwargs):
        self.args = args
        self.kwargs = kwargs


MOCK_PACKAGE_DIR = Path("some_package_dir")


@pytest.fixture(autouse=True)
def mock_protection(monkeypatch):
    """
    Ensure that a unit test will never actually run a cibuildwheel 'build'
    function, which shouldn't be run on a developer's machine
    """

    def fail_on_call(*args, **kwargs):
        raise RuntimeError("This should never be called")

    def ignore_call(*args, **kwargs):
        pass

    monkeypatch.setattr(subprocess, "Popen", fail_on_call)
    monkeypatch.setattr(util, "download", fail_on_call)
    monkeypatch.setattr(windows, "build", fail_on_call)
    monkeypatch.setattr(linux, "build", fail_on_call)
    monkeypatch.setattr(macos, "build", fail_on_call)

    monkeypatch.setattr(Path, "mkdir", ignore_call)


@pytest.fixture(autouse=True)
def fake_package_dir(monkeypatch):
    """
    Monkey-patch enough for the main() function to run
    """
    real_path_exists = Path.exists

    def mock_path_exists(path):
        if path == MOCK_PACKAGE_DIR / "setup.py":
            return True
        else:
            return real_path_exists(path)

    args = ["cibuildwheel", str(MOCK_PACKAGE_DIR)]
    monkeypatch.setattr(Path, "exists", mock_path_exists)
    monkeypatch.setattr(sys, "argv", args)
    return args


@pytest.fixture(autouse=True)
def disable_print_wheels(monkeypatch):
    @contextlib.contextmanager
    def empty_cm(*args, **kwargs):
        yield

    monkeypatch.setattr(util, "print_new_wheels", empty_cm)


@pytest.fixture
def allow_empty(request, monkeypatch, fake_package_dir):
    monkeypatch.setattr(sys, "argv", fake_package_dir + ["--allow-empty"])


@pytest.fixture(params=["linux", "macos", "windows"])
def platform(request, monkeypatch):
    platform_value = request.param
    monkeypatch.setenv("CIBW_PLATFORM", platform_value)

    if platform_value == "windows":
        monkeypatch.setattr(platform_module, "machine", lambda: "AMD64")
    else:
        monkeypatch.setattr(platform_module, "machine", lambda: "x86_64")

    if platform_value == "macos":
        monkeypatch.setattr(macos, "get_macos_version", lambda: (11, 1))

    return platform_value


@pytest.fixture
def intercepted_build_args(platform, monkeypatch):
    intercepted = ArgsInterceptor()

    if platform == "linux":
        monkeypatch.setattr(linux, "build", intercepted)
    elif platform == "macos":
        monkeypatch.setattr(macos, "build", intercepted)
    elif platform == "windows":
        monkeypatch.setattr(windows, "build", intercepted)
    else:
        raise ValueError(f"unknown platform value: {platform}")

    return intercepted