"""
Copyright 2017 Oliver Smith

This file is part of pmbootstrap.

pmbootstrap is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

pmbootstrap is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with pmbootstrap.  If not, see <http://www.gnu.org/licenses/>.
"""
import glob
import os
import pmb.helpers.run
import pmb.aportgen.core
import pmb.parse.apkindex
import pmb.chroot.apk
import pmb.chroot.apk_static


def generate(args, pkgname):
    # Install busybox-static in chroot (so we have the APKINDEX and verified
    # apks)
    arch = pkgname.split("-")[2]
    apkindex = pmb.chroot.apk_static.download(args, "APKINDEX.tar.gz")
    pmb.chroot.apk.install(args, ["busybox-static"], "buildroot_" + arch)

    # Parse version from APKINDEX
    package_data = pmb.parse.apkindex.read(args, "busybox", apkindex)
    version = package_data["version"]
    pkgver = version.split("-r")[0]
    pkgrel = version.split("-r")[1]

    # Copy the apk file to the distfiles cache
    pattern = (args.work + "/cache_apk_" + arch + "/busybox-static-" +
               version + ".*.apk")
    glob_result = glob.glob(pattern)
    if not len(glob_result):
        raise RuntimeError("Could not find aport " + pattern + "!"
                           " Update your aports_upstream git repo"
                           " to the latest version, delete your http cache"
                           " (pmbootstrap zap -hc) and try again.")
    path = glob_result[0]
    path_target = (args.work + "/cache_distfiles/busybox-static-" +
                   version + "-" + arch + ".apk")
    if not os.path.exists(path_target):
        pmb.helpers.run.user(args, ["cp", path, path_target])

    # Hash the distfile
    hashes = pmb.chroot.user(args, ["sha512sum",
                                    "busybox-static-" + version + "-" + arch + ".apk"],
                             "buildroot_" + arch, working_dir="/var/cache/distfiles",
                             return_stdout=True)

    # Write the APKBUILD
    pmb.helpers.run.user(args, ["mkdir", "-p", args.work + "/aportgen"])
    with open(args.work + "/aportgen/APKBUILD", "w", encoding="utf-8") as handle:
        # Variables
        handle.write("# Automatically generated aport, do not edit!\n"
                     "# Generator: pmbootstrap aportgen " + pkgname + "\n"
                     "\n"
                     "pkgname=" + pkgname + "\n"
                     "pkgver=" + pkgver + "\n"
                     "pkgrel=" + pkgrel + "\n"
                     "\n"
                     "_arch=\"" + arch + "\"\n"
                     "_mirror=\"" + args.mirror_alpine + "\"\n"
                     )
        # Static part
        static = """
            url="http://busybox.net"
            license="GPL2"
            arch="all"
            options="!check !strip"
            pkgdesc="Statically linked Busybox for $_arch"
            _target="$(arch_to_hostspec $_arch)"

            source="
                busybox-static-$pkgver-r$pkgrel-$_arch.apk::$_mirror/edge/main/$_arch/busybox-static-$pkgver-r$pkgrel.apk
            "

            package() {
                mkdir -p "$pkgdir/usr/$_target"
                cd "$pkgdir/usr/$_target"
                tar -xf $srcdir/busybox-static-$pkgver-r$pkgrel-$_arch.apk
                rm .PKGINFO .SIGN.*
            }
        """
        for line in static.split("\n"):
            handle.write(line[12:] + "\n")

        # Hashes
        handle.write("sha512sums=\"" + hashes.rstrip() + "\"\n")