#!/usr/bin/env python3


"""
Install Ebuild Dependencies

This script is strictly for working with ebuild files.
In normal situaltion when we already have a repository (/var/db/repos/repo),
to emerge dependencies we would just do "emerge --oneshot --onlydeps PKG".

Original author: XGQT
Copyright (c) 2020, src_prepare group
Licensed under the ISC License
"""


import argparse
from subprocess import call


parser = argparse.ArgumentParser(
    description="Install Ebuild Dependencies",
    epilog="Copyright (c) 2020, src_prepare group (License: ISC)"
)
parser.add_argument(
    "ebuild",
    nargs="*",
    type=str
)
args = parser.parse_args()


def pkg_name(pkg_str):
    """Parse string and return a pkg name"""

    # TODO: don't strip but force

    proper = ""

    # Strip required use
    for i in pkg_str:
        if i in ["["]:
            break
        proper += i

    # Strip conditional use
    for i in ["$", "DEPEND", "||", "!", "?", "(", ")"]:
        if i in proper:
            proper = ""

    return proper


def ebuild_deps(ebuild_file):
    """Returns dependencies from a ebuild file"""
    deps = []
    adddeps = False
    with open(ebuild_file) as ebuild:
        for line in ebuild.read().splitlines():
            if adddeps:
                # TODO: Find a better pkg match method
                if "/" in line:
                    deps.append(
                        pkg_name(line.strip())
                    )
                elif "\"" in line:
                    adddeps = False
            # TODO: Find a better way to find the depend "block"
            elif "DEPEND" in line:
                adddeps = True
    return deps


def main():
    """The main function"""
    print("Ebuilds:", args.ebuild)

    all_deps = []

    for ebuild in args.ebuild:
        all_deps += ebuild_deps(ebuild)

    print("Dependencies:", all_deps)

    # TODO: Maybe use Portage API
    call(
        [
            "emerge",
            "--autounmask",
            "--noreplace",
            "--oneshot"
        ]
        +
        list(filter(None, all_deps))
    )


if __name__ == "__main__":
    main()