# 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 logging
import os
from configparser import ConfigParser

from cloudinit import util
from cloudinit.cloud import Cloud
from cloudinit.config import Config
from cloudinit.config.schema import MetaSchema
from cloudinit.settings import PER_INSTANCE

meta: MetaSchema = {
    "id": "cc_yum_add_repo",
    "distros": [
        "almalinux",
        "azurelinux",
        "centos",
        "cloudlinux",
        "eurolinux",
        "fedora",
        "mariner",
        "openeuler",
        "OpenCloudOS",
        "openmandriva",
        "photon",
        "rhel",
        "rocky",
        "TencentOS",
        "virtuozzo",
    ],
    "frequency": PER_INSTANCE,
    "activate_by_schema_keys": ["yum_repos"],
}


LOG = logging.getLogger(__name__)


def _canonicalize_id(repo_id: str) -> str:
    """Canonicalize repo id.

    The sole name convention for repo ids is to not contain namespaces,
    and typically the separator used is `-`. More info:
    https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/deployment_guide/sec-setting_repository_options

    :param repo_id: Repo id to convert.
    :return: Canonical repo id.
    """
    return repo_id.replace(" ", "-")


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: str, cfg: Config, cloud: Cloud, args: list) -> None:
    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
        req_fields = ["baseurl", "metalink", "mirrorlist"]
        for req_field in req_fields:
            if req_field not in repo_config:
                missing_required += 1

        if missing_required == len(req_fields):
            LOG.warning(
                "Repository %s should contain atleast one of the"
                " following configuration entries: %s, skipping!",
                repo_id,
                ", ".join(req_fields),
            )
        else:
            repo_configs[canon_repo_id] = repo_config
            repo_locations[canon_repo_id] = repo_fn_pth

    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)
