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#!/usr/bin/env python
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
################################################################################
#
# This is a collection of helper tools to get stuff done in NSS.
#

import sys
import argparse
import subprocess
import os
import platform
from hashlib import sha256

cwd = os.path.dirname(os.path.abspath(__file__))


class cfAction(argparse.Action):
    docker_command = ["docker"]

    def __call__(self, parser, args, values, option_string=None):
        if "noroot" not in values:
            self.setDockerCommand()
        else:
            values.remove("noroot")

        # First check if we can run docker.
        try:
            with open(os.devnull, "w") as f:
                subprocess.check_call(
                    self.docker_command + ["images"], stdout=f)
        except:
            print("Please install docker and start the docker daemon.")
            sys.exit(1)

        docker_image = 'clang-format-service:latest'
        cf_docker_folder = cwd + "/automation/clang-format"

        # Build the image if necessary.
        if self.filesChanged(cf_docker_folder):
            self.buildImage(docker_image, cf_docker_folder)

        # Check if we have the docker image.
        try:
            command = self.docker_command + [
                "image", "inspect", "clang-format-service:latest"
            ]
            with open(os.devnull, "w") as f:
                subprocess.check_call(command, stdout=f)
        except:
            print("I have to build the docker image first.")
            self.buildImage(docker_image, cf_docker_folder)

        command = self.docker_command + [
            'run', '-v', cwd + ':/home/worker/nss', '--rm', '-ti', docker_image
        ]
        # The clang format script returns 1 if something's to do. We don't care.
        subprocess.call(command + values)

    def filesChanged(self, path):
        hash = sha256()
        for dirname, dirnames, files in os.walk(path):
            for file in files:
                with open(os.path.join(dirname, file), "rb") as f:
                    hash.update(f.read())
        chk_file = cwd + "/.chk"
        old_chk = ""
        new_chk = hash.hexdigest()
        if os.path.exists(chk_file):
            with open(chk_file) as f:
                old_chk = f.readline()
        if old_chk != new_chk:
            with open(chk_file, "w+") as f:
                f.write(new_chk)
            return True
        return False

    def buildImage(self, docker_image, cf_docker_folder):
        command = self.docker_command + [
            "build", "-t", docker_image, cf_docker_folder
        ]
        subprocess.check_call(command)
        return

    def setDockerCommand(self):
        if platform.system() == "Linux":
            self.docker_command = ["sudo"] + self.docker_command


class buildAction(argparse.Action):
    def __call__(self, parser, args, values, option_string=None):
        cwd = os.path.dirname(os.path.abspath(__file__))
        subprocess.check_call([cwd + "/build.sh"] + values)


class testAction(argparse.Action):
    def runTest(self, test, cycles="standard"):
        cwd = os.path.dirname(os.path.abspath(__file__))
        domsuf = os.getenv('DOMSUF', "localdomain")
        host = os.getenv('HOST', "localhost")
        env = {
            "NSS_TESTS": test,
            "NSS_CYCLES": cycles,
            "DOMSUF": domsuf,
            "HOST": host
        }
        command = cwd + "/tests/all.sh"
        subprocess.check_call(command, env=env)

    def __call__(self, parser, args, values, option_string=None):
        self.runTest(values)


def parse_arguments():
    parser = argparse.ArgumentParser(
        description='NSS helper script. ' +
        'Make sure to separate sub-command arguments with --.')
    subparsers = parser.add_subparsers()

    parser_build = subparsers.add_parser(
        'build', help='All arguments are passed to build.sh')
    parser_build.add_argument(
        'build_args', nargs='*', help="build arguments", action=buildAction)

    parser_cf = subparsers.add_parser(
        'clang-format',
        help='Run clang-format on all folders or provide a folder to format.')
    parser_cf.add_argument(
        'cf_args',
        nargs='*',
        help="clang-format folders and noroot if you don't want to use sudo",
        action=cfAction)

    parser_test = subparsers.add_parser(
        'tests', help='Run tests through tests/all.sh.')
    tests = [
        "cipher", "lowhash", "chains", "cert", "dbtests", "tools", "fips",
        "sdr", "crmf", "smime", "ssl", "ocsp", "merge", "pkits", "ec",
        "gtests", "ssl_gtests"
    ]
    parser_test.add_argument(
        'test', choices=tests, help="Available tests", action=testAction)
    return parser.parse_args()


def main():
    parse_arguments()


if __name__ == '__main__':
    main()