#!/usr/bin/env python3

import argparse
import csv
import json
import os
import re
import shutil
import subprocess
import sys

UNRELEASED = "UNRELEASED"


def find_root():
    # expected path is in <top_dir>/packages/
    top_dir = os.environ.get("CLOUD_INIT_TOP_D", None)
    if top_dir is None:
        top_dir = os.path.dirname(
            os.path.dirname(os.path.abspath(sys.argv[0]))
        )
    if os.path.isfile(os.path.join(top_dir, "meson.build")):
        return os.path.abspath(top_dir)
    raise OSError(
        (
            "Unable to determine where your cloud-init topdir is."
            " set CLOUD_INIT_TOP_D?"
        )
    )


if "avoid-pep8-E402-import-not-top-of-file":
    # Use the util functions from cloudinit
    sys.path.insert(0, find_root())
    from cloudinit import subp
    from cloudinit import util
    from cloudinit import temp_utils
    from cloudinit import templater

DEBUILD_ARGS = ["-S", "-d"]


def get_release_suffix(release):
    """Given ubuntu release, return a suffix for package

    Examples:
    ---------
    >>> get_release_suffix("jammy")
    '~22.04.1'
    """
    csv_path = "/usr/share/distro-info/ubuntu.csv"
    rels = {}
    # fields are version, codename, series, created, release, eol, eol-server
    if os.path.exists(csv_path):
        with open(csv_path, "r") as fp:
            # version has "16.04 LTS" or "16.10", so drop "LTS" portion.
            rels = {
                row["series"]: row["version"].replace(" LTS", "")
                for row in csv.DictReader(fp)
            }
    if release in rels:
        return "~%s.1" % rels[release]
    elif release != UNRELEASED:
        print(
            "missing distro-info-data package, unable to give "
            "per-release suffix.\n"
        )
    return ""


def run_helper(helper, args=None, strip=True):
    if args is None:
        args = []
    cmd = [os.path.abspath(os.path.join(find_root(), "tools", helper))] + args
    (stdout, _stderr) = subp.subp(cmd)
    if strip:
        stdout = stdout.strip()
    return stdout


def write_debian_folder(root, templ_data, cloud_util_deps):
    """Create a debian package directory with all rendered template files."""
    print("Creating a debian/ folder in %r" % (root))

    deb_dir = os.path.abspath(os.path.join(root, "debian"))

    # Just copy debian/ dir and then update files
    pdeb_d = os.path.abspath(os.path.join(find_root(), "packages", "debian"))
    subp.subp(["cp", "-a", pdeb_d, deb_dir])

    # Fill in the change log template
    templater.render_to_file(
        os.path.abspath(
            os.path.join(find_root(), "packages", "debian", "changelog.in")
        ),
        os.path.abspath(os.path.join(deb_dir, "changelog")),
        params=templ_data,
    )

    # Write out the control file template
    reqs_output = run_helper("read-dependencies", args=["--distro", "debian"])
    reqs = reqs_output.splitlines()
    test_reqs = run_helper(
        "read-dependencies",
        [
            "--distro",
            "debian",
            "--requirements-file",
            "test-requirements.txt",
            "--system-pkg-names",
        ],
    ).splitlines()

    requires = ["cloud-utils | cloud-guest-utils"] if cloud_util_deps else []
    # We consolidate all deps as Build-Depends as our package build runs all
    # tests so we need all runtime dependencies anyway.
    # NOTE: python package was moved to the front after debuild -S would fail
    # with 'Please add appropriate interpreter' errors
    # (as in debian bug 861132)
    requires.extend(["python3"] + reqs + test_reqs)
    if templ_data["debian_release"] in (
        "buster",
        "bionic",
        "focal",
    ):
        requires.append("dh-systemd")
    build_deps = ",".join(requires)
    (stdout, _stderr) = subp.subp(
        ["dpkg-query", "-W", "-f='${Provides}'", "debhelper"]
    )
    # Get latest debhelper-compat support on host
    debhelper_matches = re.findall(r"(debhelper-compat \(= \d+\)),", stdout)
    if debhelper_matches:
        if templ_data["debian_release"] == "bionic":
            # Bionic doesn't support debhelper-compat > 11
            build_deps += ",debhelper-compat (= 11)"
        elif templ_data["debian_release"] == "focal":
            # Focal doesn't support debhelper-compat > 12
            build_deps += ",debhelper-compat (= 12)"
        else:
            build_deps += f",{debhelper_matches[-1]}"
    templater.render_to_file(
        os.path.abspath(
            os.path.join(find_root(), "packages", "debian", "control.in")
        ),
        os.path.abspath(os.path.join(deb_dir, "control")),
        params={"build_depends": build_deps},
    )


def write_debian_folder_from_branch(root, templ_data, branch):
    """Import a debian package directory from a branch."""
    print("Importing debian/ from branch %s to %s" % (branch, root))

    p_dumpdeb = subprocess.Popen(
        ["git", "archive", branch, "debian"], stdout=subprocess.PIPE
    )
    subprocess.check_call(
        ["tar", "-v", "-C", root, "-x"], stdin=p_dumpdeb.stdout
    )

    print("Adding new entry to debian/changelog")
    full_deb_version = (
        templ_data["version_long"] + "-1~bddeb" + templ_data["release_suffix"]
    )
    subp.subp(
        [
            "dch",
            "--distribution",
            templ_data["debian_release"],
            "--newversion",
            full_deb_version,
            "--controlmaint",
            "Snapshot build.",
        ],
        cwd=root,
    )


def read_version():
    return json.loads(run_helper("read-version", ["--json"]))


def get_parser():
    """Setup and return an argument parser for bdeb tool."""
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "-v",
        "--verbose",
        dest="verbose",
        help=("run verbosely (default: %(default)s)"),
        default=False,
        action="store_true",
    )
    parser.add_argument(
        "--cloud-utils",
        dest="cloud_utils",
        help=("depend on cloud-utils package (default: %(default)s)"),
        default=False,
        action="store_true",
    )

    parser.add_argument(
        "--init-system",
        dest="init_system",
        help=("build deb with INIT_SYSTEM=xxx (default: %(default)s"),
        default=os.environ.get("INIT_SYSTEM", "systemd"),
    )

    parser.add_argument(
        "--release",
        dest="release",
        help=("build with changelog referencing RELEASE"),
        default=UNRELEASED,
    )

    for ent in DEBUILD_ARGS:
        parser.add_argument(
            ent,
            dest="debuild_args",
            action="append_const",
            const=ent,
            default=[],
            help=("pass through '%s' to debuild" % ent),
        )

    parser.add_argument(
        "--sign",
        default=False,
        action="store_true",
        help="sign result. do not pass -us -uc to debuild",
    )

    parser.add_argument(
        "--signuser",
        default=False,
        action="store",
        help="user to sign, see man dpkg-genchanges",
    )

    parser.add_argument(
        "--packaging-branch",
        nargs="?",
        metavar="BRANCH",
        const="ubuntu/devel",
        type=str,
        help=(
            "Import packaging from %(metavar)s instead of"
            " using the packages/debian/* templates"
            " (default: %(const)s)"
        ),
    )

    return parser


def main():
    parser = get_parser()
    args = parser.parse_args()

    if args.packaging_branch:
        try:
            subp.subp(
                [
                    "git",
                    "show-ref",
                    "--quiet",
                    "--verify",
                    "refs/heads/" + args.packaging_branch,
                ]
            )
        except subp.ProcessExecutionError:
            print("Couldn't find branch '%s'." % args.packaging_branch)
            print("You may need to checkout the branch from the git remote.")
            return 1
        try:
            subp.subp(
                [
                    "git",
                    "cat-file",
                    "-e",
                    args.packaging_branch + ":debian/control",
                ]
            )
        except subp.ProcessExecutionError:
            print(
                "Couldn't find debian/control in branch '%s'."
                " Is it a packaging branch?" % args.packaging_branch
            )
            return 1

    if not args.sign:
        args.debuild_args.extend(["-us", "-uc"])

    if args.signuser:
        args.debuild_args.extend(["-e%s" % args.signuser])

    os.environ["INIT_SYSTEM"] = args.init_system

    capture = True
    if args.verbose:
        capture = False

    templ_data = {
        "debian_release": args.release,
        "release_suffix": get_release_suffix(args.release),
    }

    with temp_utils.tempdir(needs_exe=True) as tdir:

        # output like 0.7.6-1022-g36e92d3
        ver_data = read_version()
        if ver_data["is_release_branch_ci"]:
            # If we're performing CI for a new release branch, we don't yet
            # have the tag required to generate version_long; use version
            # instead.
            ver_data["version_long"] = ver_data["version"]

        # This is really only a temporary archive
        # since we will extract it then add in the debian
        # folder, then re-archive it for debian happiness
        tarball = "cloud-init_%s.orig.tar.gz" % ver_data["version_long"]
        tarball_fp = os.path.abspath(os.path.join(tdir, tarball))
        path = None
        for pd in ("./", "../", "../dl/"):
            if os.path.exists(pd + tarball):
                path = pd + tarball
                print("Using existing tarball %s" % path)
                shutil.copy(path, tarball_fp)
                break
        if path is None:
            print("Creating a temp tarball using the 'make-tarball' helper")
            run_helper(
                "make-tarball",
                [
                    "--version",
                    ver_data["version_long"],
                    "--output=" + tarball_fp,
                ],
            )

        print("Extracting temporary tarball %r" % (tarball))
        cmd = ["tar", "-xvzf", tarball_fp, "-C", tdir]
        subp.subp(cmd, capture=capture)

        xdir = os.path.abspath(
            os.path.join(tdir, "cloud-init-%s" % ver_data["version_long"])
        )
        templ_data.update(ver_data)

        if args.packaging_branch:
            write_debian_folder_from_branch(
                xdir, templ_data, args.packaging_branch
            )
        else:
            write_debian_folder(
                xdir, templ_data, cloud_util_deps=args.cloud_utils
            )

        print(
            "Running 'debuild %s' in %r" % (" ".join(args.debuild_args), xdir)
        )
        with util.chdir(xdir):
            cmd = ["debuild", "--preserve-envvar", "INIT_SYSTEM"]
            if args.debuild_args:
                cmd.extend(args.debuild_args)
            subp.subp(cmd, capture=capture)

        link_fn = os.path.join(os.getcwd(), "cloud-init_all.deb")
        link_dsc = os.path.join(os.getcwd(), "cloud-init.dsc")
        for base_fn in os.listdir(os.path.join(tdir)):
            full_fn = os.path.join(tdir, base_fn)
            if not os.path.isfile(full_fn):
                continue
            shutil.move(full_fn, base_fn)
            print("Wrote %r" % (base_fn))
            if base_fn.endswith("_all.deb"):
                # Add in the local link
                util.del_file(link_fn)
                os.symlink(base_fn, link_fn)
                print("Linked %r to %r" % (base_fn, os.path.basename(link_fn)))
            if base_fn.endswith(".dsc"):
                util.del_file(link_dsc)
                os.symlink(base_fn, link_dsc)
                print(
                    "Linked %r to %r" % (base_fn, os.path.basename(link_dsc))
                )

    return 0


if __name__ == "__main__":
    sys.exit(main())