#!/usr/bin/env python3
#
# Copyright (C) 2021 Red Hat, Inc.
# SPDX-License-Identifier: LGPL-2.1-or-later

import argparse
import pathlib
import pty
import shutil
import subprocess
import sys


class Parser:
    def __init__(self):
        # Options that are common to all actions that use lcitool
        lcitoolparser = argparse.ArgumentParser(add_help=False)
        lcitoolparser.add_argument(
            "--lcitool",
            metavar="PATH",
            default="lcitool",
            help="path to lcitool binary",
        )

        # Main parser
        self.parser = argparse.ArgumentParser()
        subparsers = self.parser.add_subparsers(
            dest="action",
            metavar="ACTION",
        )
        subparsers.required = True

        # list-images action
        listimagesparser = subparsers.add_parser(
            "list-images",
            help="list known container images",
        )
        listimagesparser.set_defaults(func=Application.action_list_images)

        # refresh action
        refreshparser = subparsers.add_parser(
            "refresh",
            help="refresh data generated with lcitool",
            parents=[lcitoolparser],
        )
        refreshparser.set_defaults(func=Application.action_refresh)

    def parse(self):
        return self.parser.parse_args()


class Application:
    def __init__(self):
        self.basedir = pathlib.Path(__file__).resolve().parent
        self.args = Parser().parse()

        if self.args.action == "refresh":
            if not shutil.which(self.args.lcitool):
                sys.exit("error: 'lcitool' not installed")

    def make_run(self, target):
        args = [
            "-C",
            self.basedir,
            target,
        ]

        if pty.spawn(["make"] + args) != 0:
            sys.exit("error: 'make' failed")

    def lcitool_run(self, args):
        output = subprocess.check_output([self.args.lcitool] + args)
        return output.decode("utf-8")

    def lcitool_get_hosts(self):
        output = self.lcitool_run(["hosts"])
        return output.splitlines()

    def generate_dockerfile(self, host, cross=None):
        args = ["dockerfile", host, "libvirt"]
        outdir = self.basedir.joinpath("containers")
        outfile = f"ci-{host}.Dockerfile"

        if cross:
            args.extend(["--cross", cross])
            outfile = f"ci-{host}-cross-{cross}.Dockerfile"

        outpath = outdir.joinpath(outfile)
        print(outpath)

        output = self.lcitool_run(args)
        with open(outpath, "w") as f:
            f.write(output)

    def generate_vars(self, host):
        args = ["variables", host, "libvirt"]
        outdir = self.basedir.joinpath("cirrus")
        outfile = f"{host}.vars"

        outpath = outdir.joinpath(outfile)
        print(outpath)

        output = self.lcitool_run(args)
        with open(outpath, "w") as f:
            f.write(output)

    def refresh_containers(self):
        debian_cross = [
            "aarch64",
            "armv6l",
            "armv7l",
            "i686",
            "mips",
            "mips64el",
            "mipsel",
            "ppc64le",
            "s390x",
        ]
        fedora_cross = [
            "mingw32",
            "mingw64",
        ]

        for host in self.lcitool_get_hosts():
            if host.startswith("freebsd-") or host.startswith("macos-"):
                continue

            self.generate_dockerfile(host)

            if host == "fedora-rawhide":
                for cross in fedora_cross:
                    self.generate_dockerfile(host, cross)

            if host.startswith("debian-"):
                for cross in debian_cross:
                    if host == "debian-sid" and cross == "mips":
                        continue
                    self.generate_dockerfile(host, cross)

    def refresh_cirrus(self):
        for host in self.lcitool_get_hosts():
            if not (host.startswith("freebsd-") or host.startswith("macos-")):
                continue

            self.generate_vars(host)

    def action_list_images(self):
        self.make_run(f"ci-list-images")

    def action_refresh(self):
        self.refresh_containers()
        self.refresh_cirrus()

    def run(self):
        self.args.func(self)


if __name__ == "__main__":
    Application().run()