#! /usr/bin/env bash

CD_DNS_SERVERS=(
'9.9.9.9'
)
CD_REPOSITORY_NAME='cd'
CD_REPOSITORY_PATH='rwx.work'

CD_DNS_FILE='/etc/resolv.conf'
case "${CD_OS_NAME}" in
    'debian')
        case "${CD_OS_VERSION}" in
            'bookworm')
                echo 'TODO'
            ;;
            *)
                echo 'CD_OS_VERSION'
                exit 2
            ;;
        esac
    ;;
    *)
        echo 'CD_OS_NAME'
        exit 1
    ;;
esac
[ "${CI_SERVER_URL}" ] && CD_REPOSITORY_URL="${CI_SERVER_URL}"
[ "${GITHUB_SERVER_URL}" ] && CD_REPOSITORY_URL="${GITHUB_SERVER_URL}"
if [ "${CD_REPOSITORY_URL}" ] ; then
    CD_REPOSITORY_URL+="/${CD_REPOSITORY_PATH}/${CD_REPOSITORY_NAME}"
else
    echo '_REPOSITORY_URL'
    exit 3
fi
CD_STEP=0

function cd_step {
    if [ "${1}" ] ; then
        ((CD_STEP++))
        echo "
 ↕ ${CD_STEP} ↔ ${1}
"
    fi
}

function cd_write {
local file="${1}"
local text="${2}"
    if [ "${file}" ] ; then
        echo -n "${text}" \
        > "${file}" \
        || exit
    fi
}

function cd_set_dns_resolving {
local server
local text=''
    cd_step "${FUNCNAME}"
    for server in "${CD_DNS_SERVERS[@]}" ; do
        text+="nameserver ${server}
"
    done
    cd_write "${CD_DNS_FILE}" "${text}"
}

function cd_set_packages_repositories {
    cd_step "${FUNCNAME}"
    case "${CD_OS_NAME}" in
        'debian')
            cd_write '/etc/apt/sources.list' "\
deb https://deb.debian.org/debian bookworm main
deb https://deb.debian.org/debian bookworm-backports main
deb https://deb.debian.org/debian bookworm-updates main
deb https://deb.debian.org/debian-security bookworm-security main
"
        ;;
        *) exit 1 ;;
    esac
}

function cd_set_packages_configuration {
    cd_step "${FUNCNAME}"
    case "${CD_OS_NAME}" in
        'debian')
            export DEBIAN_FRONTEND='noninteractive'
            cd_write '/etc/apt/apt.conf.d/apt.conf' "\
Acquire::Check-Valid-Until True;
APT::Get::Show-Versions True;
APT::Install-Recommends False;
APT::Install-Suggests False;
Dir::Etc::SourceParts \"\";
"
        ;;
        *) exit 1 ;;
    esac
}

function cd_set_https_verification_off {
    cd_step "${FUNCNAME}"
    case "${CD_OS_NAME}" in
        'debian')
            cd_write '/etc/apt/apt.conf.d/https' "\
Acquire::https::Verify-Peer False;
"
        ;;
        *) exit 1 ;;
    esac
}

function cd_update_packages_catalog {
    cd_step "${FUNCNAME}"
    case "${CD_OS_NAME}" in
        'debian') apt-get update || exit ;;
        *) exit 1 ;;
    esac
}

function cd_install_package {
    if [ "${1}" ] ; then
        case "${CD_OS_NAME}" in
            'debian') apt-get install --yes "${1}" || exit ;;
            *) exit 1 ;;
        esac
    fi
}

function cd_install_ca {
    cd_step "${FUNCNAME}"
    case "${CD_OS_NAME}" in
        'debian') cd_install_package 'ca-certificates' ;;
        *) exit 1 ;;
    esac
}

function cd_install_git {
    cd_step "${FUNCNAME}"
    case "${CD_OS_NAME}" in
        'debian') cd_install_package 'git' ;;
        *) exit 1 ;;
    esac
}

function cd_install_packages_tools {
    cd_step "${FUNCNAME}"
    case "${CD_OS_NAME}" in
        'debian') cd_install_package 'apt-utils' ;;
        *) exit 1 ;;
    esac
}

function cd_install_python {
    cd_step "${FUNCNAME}"
    case "${CD_OS_NAME}" in
        'debian') cd_install_package 'python3' ;;
        *) exit 1 ;;
    esac
}

function cd_set_https_verification_on {
    cd_step "${FUNCNAME}"
    case "${CD_OS_NAME}" in
        'debian') rm '/etc/apt/apt.conf.d/https' ;;
        *) exit 1 ;;
    esac
}

function cd_upgrade_packages {
    cd_step "${FUNCNAME}"
    case "${CD_OS_NAME}" in
        'debian') apt-get upgrade --yes || exit ;;
        *) exit 1 ;;
    esac
}

function cd_clean_packages_cache {
    cd_step "${FUNCNAME}"
    case "${CD_OS_NAME}" in
        'debian') apt-get clean || exit ;;
        *) exit 1 ;;
    esac
}

function cd_install {
local directory
    cd_step "${FUNCNAME}"
    directory="$(mktemp --directory)" || exit
    git clone "${CD_REPOSITORY_URL}" "${directory}" || exit
    # TODO copy
}

function cd_main {
    cd_set_dns_resolving
    cd_set_packages_repositories
    cd_set_packages_configuration
    cd_set_https_verification_off
    cd_update_packages_catalog
    cd_install_packages_tools
    cd_install_ca
    cd_set_https_verification_on
    cd_update_packages_catalog
    cd_upgrade_packages
    cd_install_git
    cd_install_python
    cd_clean_packages_cache
    cd_install

    cd_step 'bootstrap'
    "${DIRECTORY}/bootstrap.sh"
}

cd_main