# Copyright 2020 The gRPC Authors
#
# 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.
"""Generates grpc-prefixed packages using template renderer.

To use this script, please use 3.7+ interpreter. This script is work-directory
agnostic. A quick executable command:

    python3 tools/distrib/python/grpc_prefixed/generate.py
"""

import dataclasses
import datetime
import logging
import os
import shutil
import subprocess
import sys

import jinja2

WORK_PATH = os.path.realpath(os.path.dirname(__file__))
LICENSE = os.path.join(WORK_PATH, "../../../../LICENSE")
BUILD_PATH = os.path.join(WORK_PATH, "build")
DIST_PATH = os.path.join(WORK_PATH, "dist")

env = jinja2.Environment(
    loader=jinja2.FileSystemLoader(os.path.join(WORK_PATH, "templates"))
)

LOGGER = logging.getLogger(__name__)
POPEN_TIMEOUT_S = datetime.timedelta(minutes=1).total_seconds()


@dataclasses.dataclass
class PackageMeta:
    """Meta-info of a PyPI package."""

    name: str
    name_long: str
    destination_package: str
    version: str = "1.0.0"


def clean() -> None:
    try:
        shutil.rmtree(BUILD_PATH)
    except FileNotFoundError:
        pass

    try:
        shutil.rmtree(DIST_PATH)
    except FileNotFoundError:
        pass


def generate_package(meta: PackageMeta) -> None:
    # Makes package directory
    package_path = os.path.join(BUILD_PATH, meta.name)
    os.makedirs(package_path, exist_ok=True)

    # Copy license
    shutil.copyfile(LICENSE, os.path.join(package_path, "LICENSE"))

    # Generates source code
    for template_name in env.list_templates():
        template = env.get_template(template_name)
        with open(
            os.path.join(package_path, template_name.replace(".template", "")),
            "w",
        ) as f:
            f.write(template.render(dataclasses.asdict(meta)))

    # Creates wheel
    job = subprocess.Popen(
        [
            sys.executable,
            os.path.join(package_path, "setup.py"),
            "sdist",
            "--dist-dir",
            DIST_PATH,
        ],
        cwd=package_path,
        stdout=subprocess.PIPE,
        stderr=subprocess.STDOUT,
    )
    outs, _ = job.communicate(timeout=POPEN_TIMEOUT_S)

    # Logs result
    if job.returncode != 0:
        LOGGER.error("Wheel creation failed with %d", job.returncode)
        LOGGER.error(outs)
    else:
        LOGGER.info("Package <%s> generated", meta.name)


def main():
    clean()

    generate_package(
        PackageMeta(
            name="grpc", name_long="gRPC Python", destination_package="grpcio"
        )
    )

    generate_package(
        PackageMeta(
            name="grpc-status",
            name_long="gRPC Rich Error Status",
            destination_package="grpcio-status",
        )
    )

    generate_package(
        PackageMeta(
            name="grpc-channelz",
            name_long="gRPC Channel Tracing",
            destination_package="grpcio-channelz",
        )
    )

    generate_package(
        PackageMeta(
            name="grpc-tools",
            name_long="ProtoBuf Code Generator",
            destination_package="grpcio-tools",
        )
    )

    generate_package(
        PackageMeta(
            name="grpc-reflection",
            name_long="gRPC Reflection",
            destination_package="grpcio-reflection",
        )
    )

    generate_package(
        PackageMeta(
            name="grpc-testing",
            name_long="gRPC Testing Utility",
            destination_package="grpcio-testing",
        )
    )

    generate_package(
        PackageMeta(
            name="grpc-health-checking",
            name_long="gRPC Health Checking",
            destination_package="grpcio-health-checking",
        )
    )

    generate_package(
        PackageMeta(
            name="grpc-csds",
            name_long="gRPC Client Status Discovery Service",
            destination_package="grpcio-csds",
        )
    )

    generate_package(
        PackageMeta(
            name="grpc-admin",
            name_long="gRPC Admin Interface",
            destination_package="grpcio-admin",
        )
    )


if __name__ == "__main__":
    logging.basicConfig(level=logging.INFO)
    main()