# -*- coding: utf-8 -*-
# Copyright 2025 Google LLC
#
# 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.
#
import os
import pathlib
import re
import shutil
from typing import Dict, List
import warnings

import nox

BLACK_VERSION = "black[jupyter]==23.7.0"
ISORT_VERSION = "isort==5.11.0"

LINT_PATHS = ["docs", "google", "tests", "noxfile.py", "setup.py"]

ALL_PYTHON = [
    "3.7",
    "3.8",
    "3.9",
    "3.10",
    "3.11",
    "3.12",
    "3.13",
    "3.14",
]

DEFAULT_PYTHON_VERSION = "3.14"

# TODO(https://github.com/googleapis/gapic-generator-python/issues/2450):
# Switch this to Python 3.15 alpha1
# https://peps.python.org/pep-0790/
PREVIEW_PYTHON_VERSION = "3.14"

CURRENT_DIRECTORY = pathlib.Path(__file__).parent.absolute()

LOWER_BOUND_CONSTRAINTS_FILE = CURRENT_DIRECTORY / "constraints.txt"
PACKAGE_NAME = "google-cloud-bigquery-datatransfer"

UNIT_TEST_STANDARD_DEPENDENCIES = [
    "mock",
    "asyncmock",
    "pytest",
    "pytest-cov",
    "pytest-asyncio",
]
UNIT_TEST_EXTERNAL_DEPENDENCIES: List[str] = []
UNIT_TEST_LOCAL_DEPENDENCIES: List[str] = []
UNIT_TEST_DEPENDENCIES: List[str] = []
UNIT_TEST_EXTRAS: List[str] = []
UNIT_TEST_EXTRAS_BY_PYTHON: Dict[str, List[str]] = {}

SYSTEM_TEST_PYTHON_VERSIONS: List[str] = ALL_PYTHON
SYSTEM_TEST_STANDARD_DEPENDENCIES = [
    "mock",
    "pytest",
    "google-cloud-testutils",
]
SYSTEM_TEST_EXTERNAL_DEPENDENCIES: List[str] = []
SYSTEM_TEST_LOCAL_DEPENDENCIES: List[str] = []
SYSTEM_TEST_DEPENDENCIES: List[str] = []
SYSTEM_TEST_EXTRAS: List[str] = []
SYSTEM_TEST_EXTRAS_BY_PYTHON: Dict[str, List[str]] = {}

nox.options.sessions = [
    "unit",
    "system",
    "cover",
    "lint",
    "lint_setup_py",
    "blacken",
    "docs",
]

# Error if a python version is missing
nox.options.error_on_missing_interpreters = True


@nox.session(python=ALL_PYTHON)
def mypy(session):
    """Run the type checker."""
    session.install(
        # TODO(https://github.com/googleapis/gapic-generator-python/issues/2410): Use the latest version of mypy
        "mypy<1.16.0",
        "types-requests",
        "types-protobuf",
    )
    session.install(".")
    session.run(
        "mypy",
        "-p",
        "google",
    )


@nox.session
def update_lower_bounds(session):
    """Update lower bounds in constraints.txt to match setup.py"""
    session.install("google-cloud-testutils")
    session.install(".")

    session.run(
        "lower-bound-checker",
        "update",
        "--package-name",
        PACKAGE_NAME,
        "--constraints-file",
        str(LOWER_BOUND_CONSTRAINTS_FILE),
    )


@nox.session
def check_lower_bounds(session):
    """Check lower bounds in setup.py are reflected in constraints file"""
    session.install("google-cloud-testutils")
    session.install(".")

    session.run(
        "lower-bound-checker",
        "check",
        "--package-name",
        PACKAGE_NAME,
        "--constraints-file",
        str(LOWER_BOUND_CONSTRAINTS_FILE),
    )


@nox.session(python=DEFAULT_PYTHON_VERSION)
def lint(session):
    """Run linters.

    Returns a failure if the linters find linting errors or sufficiently
    serious code quality issues.
    """
    session.install("flake8", BLACK_VERSION)
    session.run(
        "black",
        "--check",
        *LINT_PATHS,
    )

    session.run("flake8", "google", "tests")


@nox.session(python=DEFAULT_PYTHON_VERSION)
def blacken(session):
    """Run black. Format code to uniform standard."""
    session.install(BLACK_VERSION)
    session.run(
        "black",
        *LINT_PATHS,
    )


@nox.session(python=DEFAULT_PYTHON_VERSION)
def format(session):
    """
    Run isort to sort imports. Then run black
    to format code to uniform standard.
    """
    session.install(BLACK_VERSION, ISORT_VERSION)
    # Use the --fss option to sort imports using strict alphabetical order.
    # See https://pycqa.github.io/isort/docs/configuration/options.html#force-sort-within-sections
    session.run(
        "isort",
        "--fss",
        *LINT_PATHS,
    )
    session.run(
        "black",
        *LINT_PATHS,
    )


@nox.session(python=DEFAULT_PYTHON_VERSION)
def lint_setup_py(session):
    """Verify that setup.py is valid (including RST check)."""
    session.install("setuptools", "docutils", "pygments")
    session.run("python", "setup.py", "check", "--restructuredtext", "--strict")


def install_unittest_dependencies(session, *constraints):
    standard_deps = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_DEPENDENCIES
    session.install(*standard_deps, *constraints)

    if UNIT_TEST_EXTERNAL_DEPENDENCIES:
        warnings.warn(
            "'unit_test_external_dependencies' is deprecated. Instead, please "
            "use 'unit_test_dependencies' or 'unit_test_local_dependencies'.",
            DeprecationWarning,
        )
        session.install(*UNIT_TEST_EXTERNAL_DEPENDENCIES, *constraints)

    if UNIT_TEST_LOCAL_DEPENDENCIES:
        session.install(*UNIT_TEST_LOCAL_DEPENDENCIES, *constraints)

    if UNIT_TEST_EXTRAS_BY_PYTHON:
        extras = UNIT_TEST_EXTRAS_BY_PYTHON.get(session.python, [])
    elif UNIT_TEST_EXTRAS:
        extras = UNIT_TEST_EXTRAS
    else:
        extras = []

    if extras:
        session.install("-e", f".[{','.join(extras)}]", *constraints)
    else:
        session.install("-e", ".", *constraints)


@nox.session(python=ALL_PYTHON)
@nox.parametrize(
    "protobuf_implementation",
    ["python", "upb", "cpp"],
)
def unit(session, protobuf_implementation):
    # Install all test dependencies, then install this package in-place.

    # TODO(https://github.com/googleapis/gapic-generator-python/issues/2388):
    # Remove this check once support for Protobuf 3.x is dropped.
    if protobuf_implementation == "cpp" and session.python in (
        "3.11",
        "3.12",
        "3.13",
        "3.14",
    ):
        session.skip("cpp implementation is not supported in python 3.11+")

    constraints_path = str(
        CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
    )
    install_unittest_dependencies(session, "-c", constraints_path)

    # TODO(https://github.com/googleapis/gapic-generator-python/issues/2388):
    # Remove the 'cpp' implementation once support for Protobuf 3.x is dropped.
    # The 'cpp' implementation requires Protobuf<4.
    if protobuf_implementation == "cpp":
        session.install("protobuf<4")

    # Run py.test against the unit tests.
    session.run(
        "py.test",
        "--quiet",
        f"--junitxml=unit_{session.python}_sponge_log.xml",
        "--cov=google",
        "--cov=tests/unit",
        "--cov-append",
        "--cov-config=.coveragerc",
        "--cov-report=",
        "--cov-fail-under=0",
        os.path.join("tests", "unit"),
        *session.posargs,
        env={
            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
        },
    )


def install_systemtest_dependencies(session, *constraints):
    session.install("--pre", "grpcio")

    session.install(*SYSTEM_TEST_STANDARD_DEPENDENCIES, *constraints)

    if SYSTEM_TEST_EXTERNAL_DEPENDENCIES:
        session.install(*SYSTEM_TEST_EXTERNAL_DEPENDENCIES, *constraints)

    if SYSTEM_TEST_LOCAL_DEPENDENCIES:
        session.install("-e", *SYSTEM_TEST_LOCAL_DEPENDENCIES, *constraints)

    if SYSTEM_TEST_DEPENDENCIES:
        session.install("-e", *SYSTEM_TEST_DEPENDENCIES, *constraints)

    if SYSTEM_TEST_EXTRAS_BY_PYTHON:
        extras = SYSTEM_TEST_EXTRAS_BY_PYTHON.get(session.python, [])
    elif SYSTEM_TEST_EXTRAS:
        extras = SYSTEM_TEST_EXTRAS
    else:
        extras = []

    if extras:
        session.install("-e", f".[{','.join(extras)}]", *constraints)
    else:
        session.install("-e", ".", *constraints)


@nox.session(python=SYSTEM_TEST_PYTHON_VERSIONS)
def system(session):
    """Run the system test suite."""
    constraints_path = str(
        CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
    )
    system_test_path = os.path.join("tests", "system.py")
    system_test_folder_path = os.path.join("tests", "system")

    # Check the value of `RUN_SYSTEM_TESTS` env var. It defaults to true.
    if os.environ.get("RUN_SYSTEM_TESTS", "true") == "false":
        session.skip("RUN_SYSTEM_TESTS is set to false, skipping")
    # Install pyopenssl for mTLS testing.
    if os.environ.get("GOOGLE_API_USE_CLIENT_CERTIFICATE", "false") == "true":
        session.install("pyopenssl")

    system_test_exists = os.path.exists(system_test_path)
    system_test_folder_exists = os.path.exists(system_test_folder_path)
    # Sanity check: only run tests if found.
    if not system_test_exists and not system_test_folder_exists:
        session.skip("System tests were not found")

    install_systemtest_dependencies(session, "-c", constraints_path)

    # Run py.test against the system tests.
    if system_test_exists:
        session.run(
            "py.test",
            "--quiet",
            f"--junitxml=system_{session.python}_sponge_log.xml",
            system_test_path,
            *session.posargs,
        )
    if system_test_folder_exists:
        session.run(
            "py.test",
            "--quiet",
            f"--junitxml=system_{session.python}_sponge_log.xml",
            system_test_folder_path,
            *session.posargs,
        )


@nox.session(python=DEFAULT_PYTHON_VERSION)
def cover(session):
    """Run the final coverage report.

    This outputs the coverage report aggregating coverage from the unit
    test runs (not system test runs), and then erases coverage data.
    """
    session.install("coverage", "pytest-cov")
    session.run("coverage", "report", "--show-missing", "--fail-under=100")

    session.run("coverage", "erase")


@nox.session(python="3.10")
def docs(session):
    """Build the docs for this library."""

    session.install("-e", ".")
    session.install(
        # We need to pin to specific versions of the `sphinxcontrib-*` packages
        # which still support sphinx 4.x.
        # See https://github.com/googleapis/sphinx-docfx-yaml/issues/344
        # and https://github.com/googleapis/sphinx-docfx-yaml/issues/345.
        "sphinxcontrib-applehelp==1.0.4",
        "sphinxcontrib-devhelp==1.0.2",
        "sphinxcontrib-htmlhelp==2.0.1",
        "sphinxcontrib-qthelp==1.0.3",
        "sphinxcontrib-serializinghtml==1.1.5",
        "sphinx==4.5.0",
        "alabaster",
        "recommonmark",
    )

    shutil.rmtree(os.path.join("docs", "_build"), ignore_errors=True)
    session.run(
        "sphinx-build",
        "-W",  # warnings as errors
        "-T",  # show full traceback on exception
        "-N",  # no colors
        "-b",
        "html",  # builder
        "-d",
        os.path.join("docs", "_build", "doctrees", ""),  # cache directory
        # paths to build:
        os.path.join("docs", ""),
        os.path.join("docs", "_build", "html", ""),
    )


@nox.session(python="3.10")
def docfx(session):
    """Build the docfx yaml files for this library."""

    session.install("-e", ".")
    session.install(
        # We need to pin to specific versions of the `sphinxcontrib-*` packages
        # which still support sphinx 4.x.
        # See https://github.com/googleapis/sphinx-docfx-yaml/issues/344
        # and https://github.com/googleapis/sphinx-docfx-yaml/issues/345.
        "sphinxcontrib-applehelp==1.0.4",
        "sphinxcontrib-devhelp==1.0.2",
        "sphinxcontrib-htmlhelp==2.0.1",
        "sphinxcontrib-qthelp==1.0.3",
        "sphinxcontrib-serializinghtml==1.1.5",
        "gcp-sphinx-docfx-yaml",
        "alabaster",
        "recommonmark",
    )

    shutil.rmtree(os.path.join("docs", "_build"), ignore_errors=True)
    session.run(
        "sphinx-build",
        "-T",  # show full traceback on exception
        "-N",  # no colors
        "-D",
        (
            "extensions=sphinx.ext.autodoc,"
            "sphinx.ext.autosummary,"
            "docfx_yaml.extension,"
            "sphinx.ext.intersphinx,"
            "sphinx.ext.coverage,"
            "sphinx.ext.napoleon,"
            "sphinx.ext.todo,"
            "sphinx.ext.viewcode,"
            "recommonmark"
        ),
        "-b",
        "html",
        "-d",
        os.path.join("docs", "_build", "doctrees", ""),
        os.path.join("docs", ""),
        os.path.join("docs", "_build", "html", ""),
    )


@nox.session(python=PREVIEW_PYTHON_VERSION)
@nox.parametrize(
    "protobuf_implementation",
    ["python", "upb", "cpp"],
)
def prerelease_deps(session, protobuf_implementation):
    """
    Run all tests with pre-release versions of dependencies installed
    rather than the standard non pre-release versions.
    Pre-release versions can be installed using
    `pip install --pre <package>`.
    """

    # TODO(https://github.com/googleapis/gapic-generator-python/issues/2388):
    # Remove this check once support for Protobuf 3.x is dropped.
    if protobuf_implementation == "cpp" and session.python in (
        "3.11",
        "3.12",
        "3.13",
        "3.14",
    ):
        session.skip("cpp implementation is not supported in python 3.11+")

    # Install all dependencies
    session.install("-e", ".")

    # Install dependencies for the unit test environment
    unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
    session.install(*unit_deps_all)

    # Install dependencies for the system test environment
    system_deps_all = (
        SYSTEM_TEST_STANDARD_DEPENDENCIES
        + SYSTEM_TEST_EXTERNAL_DEPENDENCIES
        + SYSTEM_TEST_EXTRAS
    )
    session.install(*system_deps_all)

    # Because we test minimum dependency versions on the minimum Python
    # version, the first version we test with in the unit tests sessions has a
    # constraints file containing all dependencies and extras.
    with open(
        CURRENT_DIRECTORY / "testing" / f"constraints-{ALL_PYTHON[0]}.txt",
        encoding="utf-8",
    ) as constraints_file:
        constraints_text = constraints_file.read()

    # Ignore leading whitespace and comment lines.
    constraints_deps = [
        match.group(1)
        for match in re.finditer(
            r"^\s*(\S+)(?===\S+)", constraints_text, flags=re.MULTILINE
        )
    ]

    # Install dependencies specified in `testing/constraints-X.txt`.
    session.install(*constraints_deps)

    # Note: If a dependency is added to the `prerel_deps` list,
    # the `core_dependencies_from_source` list in the `core_deps_from_source`
    # nox session should also be updated.
    prerel_deps = [
        "googleapis-common-protos",
        "google-api-core",
        "google-auth",
        "grpc-google-iam-v1",
        "grpcio",
        "grpcio-status",
        "protobuf",
        "proto-plus",
    ]

    for dep in prerel_deps:
        session.install("--pre", "--no-deps", "--ignore-installed", dep)
        # TODO(https://github.com/grpc/grpc/issues/38965): Add `grpcio-status``
        # to the dictionary below once this bug is fixed.
        # TODO(https://github.com/googleapis/google-cloud-python/issues/13643): Add
        # `googleapis-common-protos` and `grpc-google-iam-v1` to the dictionary below
        # once this bug is fixed.
        package_namespaces = {
            "google-api-core": "google.api_core",
            "google-auth": "google.auth",
            "grpcio": "grpc",
            "protobuf": "google.protobuf",
            "proto-plus": "proto",
        }

        version_namespace = package_namespaces.get(dep)

        print(f"Installed {dep}")
        if version_namespace:
            session.run(
                "python",
                "-c",
                f"import {version_namespace}; print({version_namespace}.__version__)",
            )

    session.run(
        "py.test",
        "tests/unit",
        env={
            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
        },
    )


@nox.session(python=DEFAULT_PYTHON_VERSION)
@nox.parametrize(
    "protobuf_implementation",
    ["python", "upb"],
)
def core_deps_from_source(session, protobuf_implementation):
    """Run all tests with core dependencies installed from source
    rather than pulling the dependencies from PyPI.
    """

    # Install all dependencies
    session.install("-e", ".")

    # Install dependencies for the unit test environment
    unit_deps_all = UNIT_TEST_STANDARD_DEPENDENCIES + UNIT_TEST_EXTERNAL_DEPENDENCIES
    session.install(*unit_deps_all)

    # Install dependencies for the system test environment
    system_deps_all = (
        SYSTEM_TEST_STANDARD_DEPENDENCIES
        + SYSTEM_TEST_EXTERNAL_DEPENDENCIES
        + SYSTEM_TEST_EXTRAS
    )
    session.install(*system_deps_all)

    # Because we test minimum dependency versions on the minimum Python
    # version, the first version we test with in the unit tests sessions has a
    # constraints file containing all dependencies and extras.
    with open(
        CURRENT_DIRECTORY / "testing" / f"constraints-{ALL_PYTHON[0]}.txt",
        encoding="utf-8",
    ) as constraints_file:
        constraints_text = constraints_file.read()

    # Ignore leading whitespace and comment lines.
    constraints_deps = [
        match.group(1)
        for match in re.finditer(
            r"^\s*(\S+)(?===\S+)", constraints_text, flags=re.MULTILINE
        )
    ]

    # Install dependencies specified in `testing/constraints-X.txt`.
    session.install(*constraints_deps)

    # TODO(https://github.com/googleapis/gapic-generator-python/issues/2358): `grpcio` and
    # `grpcio-status` should be added to the list below so that they are installed from source,
    # rather than PyPI.
    # TODO(https://github.com/googleapis/gapic-generator-python/issues/2357): `protobuf` should be
    # added to the list below so that it is installed from source, rather than PyPI
    # Note: If a dependency is added to the `core_dependencies_from_source` list,
    # the `prerel_deps` list in the `prerelease_deps` nox session should also be updated.
    core_dependencies_from_source = [
        "googleapis-common-protos @ git+https://github.com/googleapis/google-cloud-python#egg=googleapis-common-protos&subdirectory=packages/googleapis-common-protos",
        "google-api-core @ git+https://github.com/googleapis/python-api-core.git",
        "google-auth @ git+https://github.com/googleapis/google-auth-library-python.git",
        "grpc-google-iam-v1 @ git+https://github.com/googleapis/google-cloud-python#egg=grpc-google-iam-v1&subdirectory=packages/grpc-google-iam-v1",
        "proto-plus @ git+https://github.com/googleapis/proto-plus-python.git",
    ]

    for dep in core_dependencies_from_source:
        session.install(dep, "--no-deps", "--ignore-installed")
        print(f"Installed {dep}")

    session.run(
        "py.test",
        "tests/unit",
        env={
            "PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION": protobuf_implementation,
        },
    )