# Copyright 2024 The Bazel Authors. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Tests for construction of Python version matching config settings."""

load("@//python:versions.bzl", "MINOR_MAPPING")
load("@rules_testing//lib:analysis_test.bzl", "analysis_test")
load("@rules_testing//lib:test_suite.bzl", "test_suite")
load("@rules_testing//lib:truth.bzl", "subjects")
load("@rules_testing//lib:util.bzl", rt_util = "util")

_tests = []

def _subject_impl(ctx):
    _ = ctx  # @unused
    return [DefaultInfo()]

_subject = rule(
    implementation = _subject_impl,
    attrs = {
        "match_cpu": attr.string(),
        "match_micro": attr.string(),
        "match_minor": attr.string(),
        "match_os": attr.string(),
        "match_os_cpu": attr.string(),
        "no_match": attr.string(),
        "no_match_micro": attr.string(),
    },
)

def _test_minor_version_matching(name):
    minor_matches = {
        # Having it here ensures that we can mix and match config settings defined in
        # the repo and elsewhere
        str(Label("//python/config_settings:is_python_3.11")): "matched-3.11",
        "//conditions:default": "matched-default",
    }
    minor_cpu_matches = {
        str(Label(":is_python_3.11_aarch64")): "matched-3.11-aarch64",
        str(Label(":is_python_3.11_ppc")): "matched-3.11-ppc",
        str(Label(":is_python_3.11_s390x")): "matched-3.11-s390x",
        str(Label(":is_python_3.11_x86_64")): "matched-3.11-x86_64",
    }
    minor_os_matches = {
        str(Label(":is_python_3.11_linux")): "matched-3.11-linux",
        str(Label(":is_python_3.11_osx")): "matched-3.11-osx",
        str(Label(":is_python_3.11_windows")): "matched-3.11-windows",
    }
    minor_os_cpu_matches = {
        str(Label(":is_python_3.11_linux_aarch64")): "matched-3.11-linux-aarch64",
        str(Label(":is_python_3.11_linux_ppc")): "matched-3.11-linux-ppc",
        str(Label(":is_python_3.11_linux_s390x")): "matched-3.11-linux-s390x",
        str(Label(":is_python_3.11_linux_x86_64")): "matched-3.11-linux-x86_64",
        str(Label(":is_python_3.11_osx_aarch64")): "matched-3.11-osx-aarch64",
        str(Label(":is_python_3.11_osx_x86_64")): "matched-3.11-osx-x86_64",
        str(Label(":is_python_3.11_windows_x86_64")): "matched-3.11-windows-x86_64",
    }

    rt_util.helper_target(
        _subject,
        name = name + "_subject",
        match_minor = select(minor_matches),
        match_cpu = select(minor_matches | minor_cpu_matches),
        match_os = select(minor_matches | minor_os_matches),
        match_os_cpu = select(minor_matches | minor_cpu_matches | minor_os_matches | minor_os_cpu_matches),
        no_match = select({
            "//python/config_settings:is_python_3.12": "matched-3.12",
            "//conditions:default": "matched-default",
        }),
    )

    analysis_test(
        name = name,
        target = name + "_subject",
        impl = _test_minor_version_matching_impl,
        config_settings = {
            str(Label("//python/config_settings:python_version")): "3.11.1",
            "//command_line_option:platforms": str(Label("//tests/config_settings:linux_aarch64")),
        },
    )

def _test_minor_version_matching_impl(env, target):
    target = env.expect.that_target(target)
    target.attr("match_cpu", factory = subjects.str).equals(
        "matched-3.11-aarch64",
    )
    target.attr("match_minor", factory = subjects.str).equals(
        "matched-3.11",
    )
    target.attr("match_os", factory = subjects.str).equals(
        "matched-3.11-linux",
    )
    target.attr("match_os_cpu", factory = subjects.str).equals(
        "matched-3.11-linux-aarch64",
    )
    target.attr("no_match", factory = subjects.str).equals(
        "matched-default",
    )

_tests.append(_test_minor_version_matching)

def _test_latest_micro_version_matching(name):
    rt_util.helper_target(
        _subject,
        name = name + "_subject",
        match_minor = select({
            "//python/config_settings:is_python_3.12": "matched-3.12",
            "//conditions:default": "matched-default",
        }),
        match_micro = select({
            "//python/config_settings:is_python_" + MINOR_MAPPING["3.12"]: "matched-3.12",
            "//conditions:default": "matched-default",
        }),
        no_match_micro = select({
            "//python/config_settings:is_python_3.12.0": "matched-3.12",
            "//conditions:default": "matched-default",
        }),
        no_match = select({
            "//python/config_settings:is_python_" + MINOR_MAPPING["3.11"]: "matched-3.11",
            "//conditions:default": "matched-default",
        }),
    )

    analysis_test(
        name = name,
        target = name + "_subject",
        impl = _test_latest_micro_version_matching_impl,
        config_settings = {
            str(Label("//python/config_settings:python_version")): "3.12",
        },
    )

def _test_latest_micro_version_matching_impl(env, target):
    target = env.expect.that_target(target)
    target.attr("match_minor", factory = subjects.str).equals(
        "matched-3.12",
    )
    target.attr("match_micro", factory = subjects.str).equals(
        "matched-3.12",
    )
    target.attr("no_match_micro", factory = subjects.str).equals(
        "matched-default",
    )
    target.attr("no_match", factory = subjects.str).equals(
        "matched-default",
    )

_tests.append(_test_latest_micro_version_matching)

def construct_config_settings_test_suite(name):  # buildifier: disable=function-docstring
    # We have CI runners running on a great deal of the platforms from the list below,
    # hence use all of them within tests.
    for os in ["linux", "osx", "windows"]:
        native.config_setting(
            name = "is_python_3.11_" + os,
            constraint_values = [
                "@platforms//os:" + os,
            ],
            flag_values = {
                "//python/config_settings:_python_version_major_minor": "3.11",
            },
        )

    for cpu in ["s390x", "ppc", "x86_64", "aarch64"]:
        native.config_setting(
            name = "is_python_3.11_" + cpu,
            constraint_values = [
                "@platforms//cpu:" + cpu,
            ],
            flag_values = {
                "//python/config_settings:_python_version_major_minor": "3.11",
            },
        )

    for (os, cpu) in [
        ("linux", "aarch64"),
        ("linux", "ppc"),
        ("linux", "s390x"),
        ("linux", "x86_64"),
        ("osx", "aarch64"),
        ("osx", "x86_64"),
        ("windows", "x86_64"),
    ]:
        native.config_setting(
            name = "is_python_3.11_{}_{}".format(os, cpu),
            constraint_values = [
                "@platforms//cpu:" + cpu,
                "@platforms//os:" + os,
            ],
            flag_values = {
                "//python/config_settings:_python_version_major_minor": "3.11",
            },
        )

    test_suite(
        name = name,
        tests = _tests,
    )

    native.platform(
        name = "linux_aarch64",
        constraint_values = [
            "@platforms//os:linux",
            "@platforms//cpu:aarch64",
        ],
    )