# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Joshua Harlow <harlowja@yahoo-inc.com>
#
# This file is part of cloud-init. See LICENSE file for license information.

"Yum Add Repo: Add yum repository configuration to the system"

import io
import os
from configparser import ConfigParser
from textwrap import dedent

from cloudinit import util
from cloudinit.config.schema import MetaSchema, get_meta_doc
from cloudinit.settings import PER_INSTANCE

MODULE_DESCRIPTION = """\
Add yum repository configuration to ``/etc/yum.repos.d``. Configuration files
are named based on the opaque dictionary key under the ``yum_repos`` they are
specified with. If a config file already exists with the same name as a config
entry, the config entry will be skipped.
"""

distros = [
    "almalinux",
    "centos",
    "cloudlinux",
    "eurolinux",
    "fedora",
    "openEuler",
    "photon",
    "rhel",
    "rocky",
    "virtuozzo",
]

COPR_BASEURL = (
    "https://download.copr.fedorainfracloud.org/results/@cloud-init/"
    "cloud-init-dev/epel-8-$basearch/"
)
COPR_GPG_URL = (
    "https://download.copr.fedorainfracloud.org/results/@cloud-init/"
    "cloud-init-dev/pubkey.gpg"
)
EPEL_TESTING_BASEURL = (
    "https://download.copr.fedorainfracloud.org/results/@cloud-init/"
    "cloud-init-dev/pubkey.gpg"
)

meta: MetaSchema = {
    "id": "cc_yum_add_repo",
    "name": "Yum Add Repo",
    "title": "Add yum repository configuration to the system",
    "description": MODULE_DESCRIPTION,
    "distros": distros,
    "examples": [
        dedent(
            """\
            yum_repos:
              my_repo:
                baseurl: http://blah.org/pub/epel/testing/5/$basearch/
            yum_repo_dir: /store/custom/yum.repos.d
            """
        ),
        dedent(
            f"""\
            # Enable cloud-init upstream's daily testing repo for EPEL 8 to
            # install latest cloud-init from tip of `main` for testing.
            yum_repos:
              cloud-init-daily:
                name: Copr repo for cloud-init-dev owned by @cloud-init
                baseurl: {COPR_BASEURL}
                type: rpm-md
                skip_if_unavailable: true
                gpgcheck: true
                gpgkey: {COPR_GPG_URL}
                enabled_metadata: 1
            """
        ),
        dedent(
            f"""\
            # Add the file /etc/yum.repos.d/epel_testing.repo which can then
            # subsequently be used by yum for later operations.
            yum_repos:
            # The name of the repository
             epel-testing:
               baseurl: {EPEL_TESTING_BASEURL}
               enabled: false
               failovermethod: priority
               gpgcheck: true
               gpgkey: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL
               name: Extra Packages for Enterprise Linux 5 - Testing
            """
        ),
        dedent(
            """\
            # Any yum repo configuration can be passed directly into
            # the repository file created. See: man yum.conf for supported
            # config keys.
            #
            # Write /etc/yum.conf.d/my_package_stream.repo with gpgkey checks
            # on the repo data of the repositoy enabled.
            yum_repos:
              my package stream:
                baseurl: http://blah.org/pub/epel/testing/5/$basearch/
                mirrorlist: http://some-url-to-list-of-baseurls
                repo_gpgcheck: 1
                enable_gpgcheck: true
                gpgkey: https://url.to.ascii-armored-gpg-key
            """
        ),
    ],
    "frequency": PER_INSTANCE,
}

__doc__ = get_meta_doc(meta)


def _canonicalize_id(repo_id):
    repo_id = repo_id.lower().replace("-", "_")
    repo_id = repo_id.replace(" ", "_")
    return repo_id


def _format_repo_value(val):
    if isinstance(val, (bool)):
        # Seems like yum prefers 1/0
        return str(int(val))
    if isinstance(val, (list, tuple)):
        # Can handle 'lists' in certain cases
        # See: https://linux.die.net/man/5/yum.conf
        return "\n".join([_format_repo_value(v) for v in val])
    if not isinstance(val, str):
        return str(val)
    return val


# TODO(harlowja): move to distro?
# See man yum.conf
def _format_repository_config(repo_id, repo_config):
    to_be = ConfigParser()
    to_be.add_section(repo_id)
    # Do basic translation of the items -> values
    for (k, v) in repo_config.items():
        # For now assume that people using this know
        # the format of yum and don't verify keys/values further
        to_be.set(repo_id, k, _format_repo_value(v))
    to_be_stream = io.StringIO()
    to_be.write(to_be_stream)
    to_be_stream.seek(0)
    lines = to_be_stream.readlines()
    lines.insert(0, "# Created by cloud-init on %s\n" % (util.time_rfc2822()))
    return "".join(lines)


def handle(name, cfg, _cloud, log, _args):
    repos = cfg.get("yum_repos")
    if not repos:
        log.debug(
            "Skipping module named %s, no 'yum_repos' configuration found",
            name,
        )
        return
    repo_base_path = util.get_cfg_option_str(
        cfg, "yum_repo_dir", "/etc/yum.repos.d/"
    )
    repo_locations = {}
    repo_configs = {}
    for (repo_id, repo_config) in repos.items():
        canon_repo_id = _canonicalize_id(repo_id)
        repo_fn_pth = os.path.join(repo_base_path, "%s.repo" % (canon_repo_id))
        if os.path.exists(repo_fn_pth):
            log.info(
                "Skipping repo %s, file %s already exists!",
                repo_id,
                repo_fn_pth,
            )
            continue
        elif canon_repo_id in repo_locations:
            log.info(
                "Skipping repo %s, file %s already pending!",
                repo_id,
                repo_fn_pth,
            )
            continue
        if not repo_config:
            repo_config = {}
        # Do some basic sanity checks/cleaning
        n_repo_config = {}
        for (k, v) in repo_config.items():
            k = k.lower().strip().replace("-", "_")
            if k:
                n_repo_config[k] = v
        repo_config = n_repo_config
        missing_required = 0
        for req_field in ["baseurl"]:
            if req_field not in repo_config:
                log.warning(
                    "Repository %s does not contain a %s"
                    " configuration 'required' entry",
                    repo_id,
                    req_field,
                )
                missing_required += 1
        if not missing_required:
            repo_configs[canon_repo_id] = repo_config
            repo_locations[canon_repo_id] = repo_fn_pth
        else:
            log.warning(
                "Repository %s is missing %s required fields, skipping!",
                repo_id,
                missing_required,
            )
    for (c_repo_id, path) in repo_locations.items():
        repo_blob = _format_repository_config(
            c_repo_id, repo_configs.get(c_repo_id)
        )
        util.write_file(path, repo_blob)


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