import json
import os
import tarfile
import zipfile
from os.path import abspath, dirname
from os.path import join as pjoin
from unittest.mock import Mock

import pytest
from testpath import assert_isfile, modified_env
from testpath.tempdir import TemporaryDirectory, TemporaryWorkingDirectory

from pyproject_hooks import (
    BackendUnavailable,
    BuildBackendHookCaller,
    UnsupportedOperation,
    default_subprocess_runner,
)
from pyproject_hooks._in_process import _in_proc_script_path as in_proc_script_path
from tests.compat import tomllib

SAMPLES_DIR = pjoin(dirname(abspath(__file__)), "samples")
BUILDSYS_PKGS = pjoin(SAMPLES_DIR, "buildsys_pkgs")


def get_hooks(pkg, **kwargs):
    source_dir = pjoin(SAMPLES_DIR, pkg)
    with open(pjoin(source_dir, "pyproject.toml"), "rb") as f:
        data = tomllib.load(f)
    return BuildBackendHookCaller(
        source_dir, data["build-system"]["build-backend"], **kwargs
    )


def test_missing_backend_gives_exception():
    hooks = get_hooks("pkg1")
    with modified_env({"PYTHONPATH": ""}):
        msg = "Cannot import 'buildsys'"
        with pytest.raises(BackendUnavailable, match=msg) as exc:
            hooks.get_requires_for_build_wheel({})
        assert exc.value.backend_name == "buildsys"


def test_get_requires_for_build_wheel():
    hooks = get_hooks("pkg1")
    with modified_env({"PYTHONPATH": BUILDSYS_PKGS}):
        res = hooks.get_requires_for_build_wheel({})
    assert res == ["wheelwright"]


def test_get_requires_for_build_editable():
    hooks = get_hooks("pkg1")
    with modified_env({"PYTHONPATH": BUILDSYS_PKGS}):
        res = hooks.get_requires_for_build_editable({})
    assert res == ["wheelwright", "editables"]


def test_get_requires_for_build_sdist():
    hooks = get_hooks("pkg1")
    with modified_env({"PYTHONPATH": BUILDSYS_PKGS}):
        res = hooks.get_requires_for_build_sdist({})
    assert res == ["frog"]


def test_prepare_metadata_for_build_wheel():
    hooks = get_hooks("pkg1")
    with TemporaryDirectory() as metadatadir:
        with modified_env({"PYTHONPATH": BUILDSYS_PKGS}):
            hooks.prepare_metadata_for_build_wheel(metadatadir, {})

        assert_isfile(pjoin(metadatadir, "pkg1-0.5.dist-info", "METADATA"))


def test_prepare_metadata_for_build_editable():
    hooks = get_hooks("pkg1")
    with TemporaryDirectory() as metadatadir:
        with modified_env({"PYTHONPATH": BUILDSYS_PKGS}):
            hooks.prepare_metadata_for_build_editable(metadatadir, {})

        assert_isfile(pjoin(metadatadir, "pkg1-0.5.dist-info", "METADATA"))


def test_build_wheel():
    hooks = get_hooks("pkg1")
    with TemporaryDirectory() as builddir:
        with modified_env({"PYTHONPATH": BUILDSYS_PKGS}):
            whl_file = hooks.build_wheel(builddir, {})

        assert whl_file.endswith(".whl")
        assert os.sep not in whl_file

        whl_file = pjoin(builddir, whl_file)
        assert_isfile(whl_file)
        assert zipfile.is_zipfile(whl_file)


def test_build_editable():
    hooks = get_hooks("pkg1")
    with TemporaryDirectory() as builddir:
        with modified_env({"PYTHONPATH": BUILDSYS_PKGS}):
            whl_file = hooks.build_editable(builddir, {})

        assert whl_file.endswith(".whl")
        assert os.sep not in whl_file

        whl_file = pjoin(builddir, whl_file)
        assert_isfile(whl_file)
        assert zipfile.is_zipfile(whl_file)


def test_build_wheel_relpath():
    hooks = get_hooks("pkg1")
    with TemporaryWorkingDirectory() as builddir:
        with modified_env({"PYTHONPATH": BUILDSYS_PKGS}):
            whl_file = hooks.build_wheel(".", {})

        assert whl_file.endswith(".whl")
        assert os.sep not in whl_file

        whl_file = pjoin(builddir, whl_file)
        assert_isfile(whl_file)
        assert zipfile.is_zipfile(whl_file)


def test_build_sdist():
    hooks = get_hooks("pkg1")
    with TemporaryDirectory() as sdistdir:
        with modified_env({"PYTHONPATH": BUILDSYS_PKGS}):
            sdist = hooks.build_sdist(sdistdir, {})

        assert sdist.endswith(".tar.gz")
        assert os.sep not in sdist

        sdist = pjoin(sdistdir, sdist)
        assert_isfile(sdist)
        assert tarfile.is_tarfile(sdist)

        with tarfile.open(sdist) as tf:
            contents = tf.getnames()
        assert "pkg1-0.5/pyproject.toml" in contents


def test_build_sdist_unsupported():
    hooks = get_hooks("pkg1")
    with TemporaryDirectory() as sdistdir:
        with modified_env({"PYTHONPATH": BUILDSYS_PKGS}):
            with pytest.raises(UnsupportedOperation):
                hooks.build_sdist(sdistdir, {"test_unsupported": True})


def test_runner_replaced_on_exception(monkeypatch):
    monkeypatch.setenv("PYTHONPATH", BUILDSYS_PKGS)

    runner = Mock(wraps=default_subprocess_runner)
    hooks = get_hooks("pkg1", runner=runner)

    hooks.get_requires_for_build_wheel()
    runner.assert_called_once()
    runner.reset_mock()

    runner2 = Mock(wraps=default_subprocess_runner)
    try:
        with hooks.subprocess_runner(runner2):
            hooks.get_requires_for_build_wheel()
            runner2.assert_called_once()
            runner2.reset_mock()
            raise RuntimeError()
    except RuntimeError:
        pass

    hooks.get_requires_for_build_wheel()
    runner.assert_called_once()


def test_custom_python_executable(monkeypatch, tmpdir):
    monkeypatch.setenv("PYTHONPATH", BUILDSYS_PKGS)

    runner = Mock(autospec=default_subprocess_runner)
    hooks = get_hooks("pkg1", runner=runner, python_executable="some-python")

    with hooks.subprocess_runner(runner):
        with pytest.raises(FileNotFoundError):
            # output.json is missing because we didn't actually run the hook
            hooks.get_requires_for_build_wheel()
        runner.assert_called_once()
        assert runner.call_args[0][0][0] == "some-python"


def test_path_pollution():
    hooks = get_hooks("path-pollution")
    with TemporaryDirectory() as outdir:
        with modified_env(
            {
                "PYTHONPATH": BUILDSYS_PKGS,
                "TEST_POLLUTION_OUTDIR": outdir,
            }
        ):
            hooks.get_requires_for_build_wheel({})
        with open(pjoin(outdir, "out.json")) as f:
            captured_sys_path = json.load(f)

    with in_proc_script_path() as path:
        assert os.path.dirname(path) not in captured_sys_path
    assert captured_sys_path[0] == BUILDSYS_PKGS


def test_setup_py():
    hooks = get_hooks("setup-py")
    with modified_env({"PYTHONPATH": BUILDSYS_PKGS}):
        res = set(hooks.get_requires_for_build_wheel({}))
    # Depending on the version of setuptools, it may be both, just wheel, or neither
    assert res.issubset({"setuptools", "wheel"})


@pytest.mark.parametrize(
    ("pkg", "expected"),
    [
        ("pkg1", ["build_editable"]),
        ("pkg2", []),
        ("pkg3", ["build_editable"]),
    ],
)
def test__supported_features(pkg, expected):
    hooks = get_hooks(pkg)
    with modified_env({"PYTHONPATH": BUILDSYS_PKGS}):
        res = hooks._supported_features()
    assert res == expected