#! /usr/bin/env sh

set "cd" "rwx"

cd_main () {
    cd_set_environment
    cd_set_dns_resolving \
    "9.9.9.9"
    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_copy_ca
    cd_update_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_python_modules "${@}"
    cd_execute_python_module "${@}"
}

#

cd_set_environment () {
    cd_step "Set environment"
    CD_DNS_FILE="/etc/resolv.conf"
    #
    case "${CD_OS_NAME}" in
        "debian")
            CD_PYTHON_COMMAND="python3"
            CD_PYTHON_PACKAGES="/usr/lib/python3/dist-packages"
            case "${CD_OS_VERSION}" in
                "bookworm")
                    echo "TODO"
                ;;
                *) cd_error_os "CD_OS_VERSION=" ;;
            esac
        ;;
        *) cd_error_os "CD_OS_NAME=" ;;
    esac
    # ci / github
    if [ "${GITHUB_ACTIONS}" ] ; then
        CD_SERVER_URL="${GITHUB_SERVER_URL}"
        CD_PROJECTS_GROUP="$(dirname "${GITHUB_REPOSITORY}")"
        CD_PROJECT_NAME="$(basename "${GITHUB_REPOSITORY}")"
        CD_PROJECT_BRANCH="${GITHUB_REF_NAME}"
    # ci / gitlab
    elif [ "${GITLAB_CI}" ] ; then
        CD_SERVER_URL="${CI_SERVER_URL}"
        CD_PROJECTS_GROUP="$(dirname "${CI_PROJECT_PATH}")"
        CD_PROJECT_NAME="$(basename "${CI_PROJECT_PATH}")"
        CD_PROJECT_BRANCH="${CI_COMMIT_BRANCH}"
    # ci / none
    else
        cd_error_ci "ø"
    fi
    #
    [ "${CD_SERVER_URL}" ] || cd_error_ci "CD_SERVER_URL"
    [ "${CD_PROJECTS_GROUP}" ] || cd_error_ci "CD_PROJECTS_GROUP"
    [ "${CD_PROJECT_NAME}" ] || cd_error_ci "CD_PROJECT_NAME"
    [ "${CD_PROJECT_BRANCH}" ] || cd_error_ci "CD_PROJECT_BRANCH"
    #
    CD_PROJECTS_URL="${CD_SERVER_URL}/${CD_PROJECTS_GROUP}"
    CD_PROJECT_URL="${CD_PROJECTS_URL}/${CD_PROJECT_NAME}"
    #
    echo -n "\
CD_OS_NAME=${CD_OS_NAME}
CD_OS_VERSION=${CD_OS_VERSION}
#
CD_DNS_FILE=${CD_DNS_FILE}
#
CD_PYTHON_COMMAND=${CD_PYTHON_COMMAND}
CD_PYTHON_PACKAGES=${CD_PYTHON_PACKAGES}
#
CD_SERVER_URL=${CD_SERVER_URL}
CD_PROJECTS_GROUP=${CD_PROJECTS_GROUP}
CD_PROJECT_NAME=${CD_PROJECT_NAME}
CD_PROJECT_BRANCH=${CD_PROJECT_BRANCH}
#
CD_PROJECTS_URL=${CD_PROJECTS_URL}
CD_PROJECT_URL=${CD_PROJECT_URL}
"
}

cd_set_dns_resolving () {
local server
local text=""
    cd_step "Set DNS resolving"
    for server in "${@}" ; do
        text="${text}nameserver ${server}
"
    done
    cd_write "${CD_DNS_FILE}" "${text}"
    cd_cat "${CD_DNS_FILE}"
}

cd_set_packages_repositories () {
    cd_step "Set packages repositories"
    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
"
            cd_cat "/etc/apt/sources.list"
        ;;
        *) cd_error_os "cd_set_packages_repositories" ;;
    esac
}

cd_set_packages_configuration () {
    cd_step "Set packages configuration"
    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 \"\";
"
            cd_cat "/etc/apt/apt.conf.d/apt.conf"
        ;;
        *) cd_error_os "cd_set_packages_configuration" ;;
    esac
}

cd_set_https_verification_off () {
    cd_step "Set HTTPS verification off"
    case "${CD_OS_NAME}" in
        "debian")
            cd_write "/etc/apt/apt.conf.d/https" "\
Acquire::https::Verify-Peer False;
"
            cd_cat "/etc/apt/apt.conf.d/https"
        ;;
        *) cd_error_os "cd_set_https_verification_off" ;;
    esac
}

cd_update_packages_catalog () {
    cd_step "Update packages catalog"
    case "${CD_OS_NAME}" in
        "debian") apt-get update || exit ;;
        *) cd_error_os "cd_update_packages_catalog" ;;
    esac
}

cd_install_packages_tools () {
    cd_step "Install packages tools"
    case "${CD_OS_NAME}" in
        "debian") cd_install_package "apt-utils" ;;
        *) cd_error_os "cd_install_packages_tools" ;;
    esac
}

cd_install_ca () {
    cd_step "Install CA"
    case "${CD_OS_NAME}" in
        "debian") cd_install_package "ca-certificates" ;;
        *) cd_error_os "cd_install_ca" ;;
    esac
}

cd_copy_ca () {
local target
    cd_step "Copy CA"
    case "${CD_OS_NAME}" in
        "debian") target="/usr/local/share/ca-certificates" ;;
        *) cd_error_os "cd_copy_ca" ;;
    esac
    # TODO copy
}

cd_update_ca () {
    cd_step "Update CA"
    case "${CD_OS_NAME}" in
        "debian") update-ca-certificates || exit ;;
        *) cd_error_os "cd_update_ca" ;;
    esac
}

cd_set_https_verification_on () {
    cd_step "Set HTTPS verification on"
    case "${CD_OS_NAME}" in
        "debian") cd_rm "/etc/apt/apt.conf.d/https" ;;
        *) cd_error_os "cd_set_https_verification_on" ;;
    esac
}

cd_upgrade_packages () {
    cd_step "Upgrade packages"
    case "${CD_OS_NAME}" in
        "debian") apt-get upgrade --yes || exit ;;
        *) cd_error_os "cd_upgrade_packages" ;;
    esac
}

cd_install_git () {
    cd_step "Install Git"
    case "${CD_OS_NAME}" in
        "debian") cd_install_package "git" ;;
        *) cd_error_os "cd_install_git" ;;
    esac
}

cd_install_python () {
    cd_step "Install Python"
    case "${CD_OS_NAME}" in
        "debian") cd_install_package "python3" ;;
        *) cd_error_os "cd_install_python" ;;
    esac
}

cd_clean_packages_cache () {
    cd_step "Clean packages cache"
    case "${CD_OS_NAME}" in
        "debian") apt-get clean || exit ;;
        *) cd_error_os "cd_clean_packages_cache" ;;
    esac
}

cd_install_python_modules () {
local path
local repository
local root
local url
    cd_step "Install Python modules"
    root="$(mktemp --directory)" || exit
    echo "${root}"
    for repository in "${@}" ; do
        url="${CD_PROJECTS_URL}/${repository}"
        echo -n "
${url}
↓
"
        git clone \
        "${url}" "${root}/${repository}" \
        || exit
        path="${root}/${repository}/${repository}"
        echo -n "\
${path}
↓
${CD_PYTHON_PACKAGES}
"
        cp --recursive \
        "${path}" "${CD_PYTHON_PACKAGES}" \
        || exit
    done
    cd_rm "${root}"
}

cd_execute_python_module () {
local self
    cd_step "Execute Python module"
    self="$(realpath "${0}")"
    echo -n "\
${self}
↓
${1}
"
    "${CD_PYTHON_COMMAND}" -m "${1}" "${CD_STEP}" "${self}"
}

#

cd_cat () {
    if [ -f "${1}" ] ; then
        echo "⋅$(realpath "${1}")"
        cat "${1}" || exit
    fi
}

cd_error_ci () {
    echo "× CI: ${1}"
    exit 1
}
cd_error_os () {
    echo "× OS: ${1}"
    exit 2
}

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

cd_rm () {
    if [ -e "${1}" ] ; then
        echo "× $(realpath "${1}")"
        rm --recursive "${1}" || exit
    fi
}

cd_step () {
    if [ "${1}" ] ; then
        CD_STEP=$((CD_STEP+1))
        echo "\
\\
 ${CD_STEP} ${1}
/
"
    fi
}

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

#

cd_main "${@}"