#!/usr/bin/python3

# Copyright 2021 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Prep everything for for a Docker Build Context."""


import argparse

import os
import pathlib
import shutil
import sys

sys.path.insert(1, str(pathlib.Path(__file__).parent.resolve()/'../../'))

from python.lib import container_util  # noqa: E402


def parse_local_arguments():
    """Parse the CLI."""
    parser = argparse.ArgumentParser(
        description="Prep Tauto, Tast, & Services for DockerBuild.")
    parser.add_argument('-chroot', dest='chroot',
                        help='chroot (String): The chroot path to use.')
    parser.add_argument('-sysroot', dest='sysroot',
                        help=' sysroot (String): The sysroot path to use.')
    parser.add_argument('-path', dest='path',
                        help='path (String): Path to write artifacts to.')
    parser.add_argument('-force_path', dest='force_path', default=False,
                        help='Delete anything conflicting in the outpath.')
    parser.add_argument('-src', dest='src',
                        help='path (String): The src tree path.')

    args = parser.parse_args()
    return args


class DockerPrep():
    """Prep Needed files for the Test Execution Container Docker Build."""

    def __init__(self, args):
        """@param args (ArgumentParser): .chroot, .sysroot, .path."""
        self.args = args
        self.full_autotest = ""
        self.full_bin = ""
        self.full_out = ""
        self.build_path = ""
        self.chroot_bin = ""
        self.chroot = self.args.chroot
        self.src_root = self.args.src
        self.sysroot = self.args.sysroot
        if self.sysroot.startswith('/'):
            self.sysroot = self.sysroot[1:]

    def config_paths(self):
        """Build up the paths needed in local mem."""
        self.build_path = os.path.join(self.chroot, self.sysroot)
        self.full_autotest = os.path.join(
                self.build_path, 'usr/local/build/autotest')
        self.chroot_bin = os.path.join(self.chroot, 'usr/bin')
        self.full_bin = os.path.join(self.build_path, 'usr/bin')
        self.full_out = os.path.join(self.build_path, self.args.path)
        self.validate_paths()
        self.prep_artifact_dir()

    def validate_paths(self):
        """Verify the paths generated are valid/exist."""
        if not os.path.isdir(self.full_autotest):
            if not os.path.exists(self.full_autotest):
                raise Exception("Autotest path %s does not exist"
                                % self.full_autotest)
            raise Exception("Autotest path %s is not a directory"
                            % self.full_autotest)

        if not os.path.isdir(self.build_path):
            if not os.path.exists(self.build_path):
                raise Exception("sysroot %s does not exist"
                                % self.build_path)
            raise Exception("sysroot %s is not a directory" %
                            self.build_path)

    def prep_artifact_dir(self):
        """Prepare the artifact dir. If it does not exist, create it."""
        if os.path.exists(self.full_out):
            if self.args.force_path:
                print("Deleting existing prepdir {}".format(self.full_out))
                shutil.rmtree(self.full_out)
            else:
                raise Exception("outpath %s exists and force is not set."
                                % self.full_out)
        os.makedirs(self.full_out, exist_ok=True)

    def create_tarball(self):
        """Copy the Stuff."""
        builder = container_util.AutotestTarballBuilder(
                os.path.dirname(self.full_autotest),
                self.full_out,
                self.chroot)

        builder.BuildFullAutotestandTastTarball()

    def copy_services(self):
        """Copy services needed for Docker."""
        shutil.copy(os.path.join(self.chroot_bin, 'testexecserver'),
                    self.full_out)

    def copy_metadata(self):
        """Return the absolute path of the metadata files."""
        # Relative to build
        _BUILD_METADATA_FILES = [
                ('usr/local/build/autotest/autotest_metadata.pb',
                    os.path.join(self.full_out, 'autotest_metadata.pb')),
                ('usr/share/tast/metadata/local/cros.pb',
                    os.path.join(self.full_out, 'local_cros.pb')),
                ('build/share/tast/metadata/local/crosint.pb',
                    os.path.join(self.full_out, 'crosint.pb'))]

        # relative to chroot.
        _CHROOT_METADATA_FILES = [
            ('usr/share/tast/metadata/remote/cros.pb',
                os.path.join(self.full_out, 'remote_cros.pb'))]

        for f, d in _BUILD_METADATA_FILES:
            shutil.copyfile(
                container_util.FromSysrootPath(self.build_path, f),
                os.path.join(self.full_out, d))

        for f, d in _CHROOT_METADATA_FILES:
            shutil.copyfile(
                container_util.FromChrootPath(self.chroot, f),
                os.path.join(self.full_out, d))

    def copy_dockerfiles(self):
        """Copy Dockerfiles needed to build the container to the output dir."""
        dockerfile_relative_dir = 'platform/dev/test/container/dockerfiles/'

        src = os.path.join(self.src_root, dockerfile_relative_dir)
        for item in os.listdir(src):
            s = os.path.join(src, item)
            d = os.path.join(self.full_out, item)
            shutil.copy2(s, d)


def main():
    """Entry point."""

    if not (sys.version_info.major == 3 and sys.version_info.minor >= 6):
        print('python3.6 or greater is required.')
        sys.exit(1)

    args = parse_local_arguments()
    builder = DockerPrep(args)
    builder.config_paths()
    builder.create_tarball()
    builder.copy_services()
    builder.copy_metadata()
    builder.copy_dockerfiles()


if __name__ == "__main__":
    main()