#! /usr/bin/env bash

CD_DNS_SERVERS=(
'9.9.9.9'
)
CD_NAME='cd'
CD_PROJECTS_PARENT='rwx'

function cd_set_environment {
    CD_DNS_FILE='/etc/resolv.conf'
    CD_ENV="$(mktemp)"
    case "${CD_OS_NAME}" in
        'debian')
            CD_PYTHON_COMMAND='python3'
            CD_PYTHON_PACKAGES='/usr/lib/python3/dist-packages'
            case "${CD_OS_VERSION}" in
                'bookworm')
                    echo 'TODO'
                ;;
                *)
                    echo 'CD_OS_VERSION'
                    exit 2
                ;;
            esac
        ;;
        *)
            echo 'CD_OS_NAME'
            exit 1
        ;;
    esac
    # project / branch
    [ "${CI_COMMIT_BRANCH}" ] && CD_PROJECT_BRANCH="${CI_COMMIT_BRANCH}"
    [ "${GITHUB_REF_NAME}" ] && CD_PROJECT_BRANCH="${GITHUB_REF_NAME}"
    if [ ! "${CD_PROJECT_BRANCH}" ] ; then
        echo 'CD_PROJECT_BRANCH'
        exit 3
    fi
    # project / name
    [ "${CI_PROJECT_PATH}" ] \
    && CD_PROJECT_NAME="$(basename "${CI_PROJECT_PATH}")"
    [ "${GITHUB_REPOSITORY}" ] \
    && CD_PROJECT_NAME="$(basename "${GITHUB_REPOSITORY}")"
    if [ ! "${CD_PROJECT_NAME}" ] ; then
        echo 'CD_PROJECT_NAME'
        exit 3
    fi
    # projects / group
    [ "${CI_PROJECT_PATH}" ] \
    && CD_PROJECTS_GROUP="$(dirname "${CI_PROJECT_PATH}")"
    [ "${GITHUB_REPOSITORY}" ] \
    && CD_PROJECTS_GROUP="$(dirname "${GITHUB_REPOSITORY}")"
    if [ ! "${CD_PROJECTS_GROUP}" ] ; then
        echo 'CD_PROJECTS_GROUP'
        exit 3
    fi
    # projects / url
    [ "${CI_SERVER_URL}" ] && CD_PROJECTS_URL="${CI_SERVER_URL}"
    [ "${GITHUB_SERVER_URL}" ] && CD_PROJECTS_URL="${GITHUB_SERVER_URL}"
    if [ "${CD_PROJECTS_URL}" ] ; then
        CD_PROJECTS_URL+="/${CD_PROJECTS_GROUP}"
    else
        echo 'CD_PROJECTS_URL'
        exit 3
    fi
    # project / url
    CD_PROJECT_URL="${CD_PROJECTS_URL}/${CD_PROJECT_NAME}"
}

function cd_write_environment {
    cd_write "${CD_ENV}" "{
\"project\": {
 \"branch\": \"${CD_PROJECT_BRANCH}\",
 \"name\": \"${CD_PROJECT_NAME}\",
 \"url\": \"${CD_PROJECT_URL}\"
},
\"projects\": {
 \"group\": \"${CD_PROJECTS_GROUP}\",
 \"url\": \"${CD_PROJECTS_URL}\"
}
}
"
    cat "${CD_ENV}"
}

function cd_step {
    if [ "${1}" ] ; then
        CD_STEP=$((CD_STEP+1))
        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 repository
local root
    cd_step "${FUNCNAME}"
    root="$(mktemp --directory)" || exit
    for repository in \
    "${CD_PROJECTS_PARENT}" \
    "${CD_NAME}" \
    ; do
        git clone \
        "${CD_PROJECTS_URL}/${repository}" "${root}/${repository}" \
        || exit
        cp --recursive \
        "${root}/${repository}/${repository}" "${CD_PYTHON_PACKAGES}" \
        || exit
    done
    rm --force --recursive "${root}" || exit
}

function cd_bootstrap {
    cd_step "${FUNCNAME}"
    "${CD_PYTHON_COMMAND}" -m "${CD_NAME}"
}

function cd_main {
    cd_set_environment
    cd_write_environment
    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_bootstrap
}

cd_main