#!/usr/bin/env python3
#  Copyright (c) 2019. Vinci Consulting Corp. 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.

import argparse
import pathlib
import subprocess
import vppapigen
import os
from multiprocessing import Pool

BASE_DIR = (
    subprocess.check_output("git rev-parse --show-toplevel", shell=True)
    .strip()
    .decode()
)

src_dir_depth = 3
output_path = pathlib.Path(
    "%s/build-root/install-vpp-native/vpp/share/vpp/api/" % BASE_DIR
)
output_path_debug = pathlib.Path(
    "%s/build-root/install-vpp_debug-native/vpp/share/vpp/api/" % BASE_DIR
)

output_dir_map = {
    "plugins": "plugins",
    "vlibmemory": "core",
    "vnet": "core",
    "vlib": "core",
    "vpp": "core",
}


def api_search_globs(src_dir):
    globs = []
    for g in output_dir_map:
        globs.extend(list(src_dir.glob("%s/**/*.api" % g)))
    return globs


def api_files(src_dir):
    print("Searching '%s' for .api files." % src_dir.as_posix())
    return [x for x in api_search_globs(src_dir)]


def get_n_parallel(n_parallel):
    if n_parallel == 0:
        n_parallel = os.environ.get("MAKE_PARALLEL_JOBS", os.cpu_count())
        try:
            n_parallel = int(n_parallel)
        except ValueError:
            return os.cpu_count()
    return n_parallel or os.cpu_count()


def main():
    cliparser = argparse.ArgumentParser(description="VPP API JSON definition generator")
    cliparser.add_argument("--srcdir", action="store", default="%s/src" % BASE_DIR),
    cliparser.add_argument("--output", action="store", help="directory to store files"),
    cliparser.add_argument(
        "--parallel", type=int, default=0, help="Number of parallel processes"
    ),
    cliparser.add_argument(
        "--debug-target",
        action="store_true",
        default=False,
        help="'True' if -debug target",
    ),

    args = cliparser.parse_args()

    src_dir = pathlib.Path(args.srcdir)
    output_target = output_path_debug if args.debug_target else output_path

    if args.output:
        output_dir = pathlib.Path(args.output)
    else:
        output_dir = pathlib.Path(output_target)

    for d in output_dir_map.values():
        output_dir.joinpath(d).mkdir(exist_ok=True, parents=True)

    for f in output_dir.glob("**/*.api.json"):
        f.unlink()

    with Pool(get_n_parallel(args.parallel)) as p:
        p.map(
            vppapigen.run_kw_vppapigen,
            [
                {
                    "output": "%s/%s/%s.json"
                    % (
                        output_path,
                        output_dir_map[
                            f.as_posix().split("/")[
                                src_dir_depth + BASE_DIR.count("/") - 1
                            ]
                        ],
                        f.name,
                    ),
                    "outputdir": "%s/%s/"
                    % (
                        output_path,
                        output_dir_map[
                            f.as_posix().split("/")[
                                src_dir_depth + BASE_DIR.count("/") - 1
                            ]
                        ],
                    ),
                    "input_file": f.as_posix(),
                    "includedir": [src_dir.as_posix()],
                    "output_module": "JSON",
                }
                for f in api_files(src_dir)
            ],
        )

    print("json files written to: %s/." % output_dir)


if __name__ == "__main__":
    main()