# -*- coding: utf-8 -*-
#
# Copyright 2018 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
#
#     https://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.

from __future__ import absolute_import
import os

import nox


LOCAL_DEPS = (os.path.join("..", "api_core"), os.path.join("..", "core"))

@nox.session(python="3.7")
def lint(session):
    """Run linters.

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


@nox.session(python="3.6")
def blacken(session):
    """Run black.

    Format code to uniform standard.
    """
    session.install("black")
    session.run(
        "black",
        "google",
        "tests",
        "docs",
    )


@nox.session(python="3.7")
def lint_setup_py(session):
    """Verify that setup.py is valid (including RST check)."""
    session.install("docutils", "pygments")
    session.run("python", "setup.py", "check", "--restructuredtext", "--strict")


def default(session):
    # Install all test dependencies, then install this package in-place.
    session.install("mock", "pytest", "pytest-cov")
    for local_dep in LOCAL_DEPS:
        session.install("-e", local_dep)
    session.install("-e", ".")

    # Run py.test against the unit tests.
    session.run(
        "py.test",
        "--quiet",
        "--cov=google.cloud",
        "--cov=tests.unit",
        "--cov-append",
        "--cov-config=.coveragerc",
        "--cov-report=",
        "--cov-fail-under=79",
        os.path.join("tests", "unit"),
        *session.posargs,
    )


@nox.session(python=["2.7", "3.5", "3.6", "3.7"])
def unit(session):
    """Run the unit test suite."""
    default(session)


@nox.session(python=["2.7", "3.7"])
def system(session):
    """Run the system test suite."""
    system_test_path = os.path.join("tests", "system.py")
    system_test_folder_path = os.path.join("tests", "system")
    # Sanity check: Only run tests if the environment variable is set.
    if not os.environ.get("GOOGLE_APPLICATION_CREDENTIALS", ""):
        session.skip("Credentials must be set via environment variable")

    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")

    # Use pre-release gRPC for system tests.
    session.install("--pre", "grpcio")

    # Install all test dependencies, then install this package into the
    # virtualenv's dist-packages.
    session.install("mock", "pytest")
    for local_dep in LOCAL_DEPS:
        session.install("-e", local_dep)
    session.install("-e", "../test_utils/")
    session.install("-e", ".")

    # Run py.test against the system tests.
    if system_test_exists:
        session.run("py.test", "--quiet", system_test_path, *session.posargs)
    if system_test_folder_exists:
        session.run("py.test", "--quiet", system_test_folder_path, *session.posargs)


@nox.session(python="3.7")
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=80")

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