#!/usr/bin/env bash
# SPDX-License-Identifier: AGPL-3.0-or-later

# shellcheck source=utils/lib.sh
source "$(dirname "${BASH_SOURCE[0]}")/lib.sh"
# shellcheck source=utils/lib_go.sh
source "${REPO_ROOT}/utils/lib_go.sh"
# shellcheck source=utils/lib_install.sh
source "${REPO_ROOT}/utils/lib_install.sh"

# ----------------------------------------------------------------------------
# config
# ----------------------------------------------------------------------------

MORTY_LISTEN="${MORTY_LISTEN:-127.0.0.1:3000}"
PUBLIC_URL_PATH_MORTY="${PUBLIC_URL_PATH_MORTY:-/morty/}"
PUBLIC_URL_MORTY="${PUBLIC_URL_MORTY:-$(echo "$PUBLIC_URL" |  sed -e's,^\(.*://[^/]*\).*,\1,g')${PUBLIC_URL_PATH_MORTY}}"

# shellcheck disable=SC2034
MORTY_TIMEOUT=5

SERVICE_NAME="morty"
SERVICE_USER="${SERVICE_USER:-${SERVICE_NAME}}"
SERVICE_HOME_BASE="${SERVICE_HOME_BASE:-/usr/local}"
SERVICE_HOME="${SERVICE_HOME_BASE}/${SERVICE_USER}"
SERVICE_SYSTEMD_UNIT="${SYSTEMD_UNITS}/${SERVICE_NAME}.service"
# shellcheck disable=SC2034
SERVICE_GROUP="${SERVICE_USER}"
# shellcheck disable=SC2034
SERVICE_ENV_DEBUG=false

GO_ENV="${SERVICE_HOME}/.go_env"
GO_VERSION="go1.17.2"

# shellcheck disable=SC2034
CONFIG_FILES=()

# Apache Settings

APACHE_MORTY_SITE="morty.conf"
NGINX_MORTY_SITE="morty.conf"

# ----------------------------------------------------------------------------
usage() {
# ----------------------------------------------------------------------------

    # shellcheck disable=SC1117
    cat <<EOF
usage::
  $(basename "$0") shell
  $(basename "$0") install    [all|check|user]
  $(basename "$0") reinstall  all
  $(basename "$0") update     [morty]
  $(basename "$0") remove     [all]
  $(basename "$0") activate   [service]
  $(basename "$0") deactivate [service]
  $(basename "$0") inspect    [service]
  $(basename "$0") option     [debug-on|debug-off|new-key]
  $(basename "$0") apache     [install|remove]
  $(basename "$0") nginx      [install|remove]
  $(basename "$0") info       [searx]

shell
  start interactive shell from user ${SERVICE_USER}
install / remove
  :all:        complete setup of morty service
  :user:       add/remove service user '$SERVICE_USER' ($SERVICE_HOME)
install
  :check:      check the morty installation
reinstall:
  :all:        runs 'install/remove all'
update morty
  Update morty installation ($SERVICE_HOME)
activate service
  activate and start service daemon (systemd unit)
deactivate service
  stop and deactivate service daemon (systemd unit)
inspect service
  show service status and log
option
  set one of the available options
  :new-key:   set new morty key
apache : ${PUBLIC_URL_MORTY}
  :install: apache site with a reverse proxy (ProxyPass)
  :remove:  apache site ${APACHE_MORTY_SITE}
nginx (${PUBLIC_URL_MORTY})
  :install: nginx site with a reverse proxy (ProxyPass)
  :remove:  nginx site ${NGINX_MORTY_SITE}
----
sourced ${DOT_CONFIG} :
  SERVICE_USER        : ${SERVICE_USER}
  SERVICE_HOME        : ${SERVICE_HOME}
  PUBLIC_URL_MORTY:   : ${PUBLIC_URL_MORTY}
  MORTY_LISTEN:       : ${MORTY_LISTEN}
EOF

    install_log_searx_instance
    if in_container; then
        # in containers the service is listening on 0.0.0.0 (see lxc-searxng.env)
        for ip in $(global_IPs) ; do
            if [[ $ip =~ .*:.* ]]; then
                echo "  container URL (IPv6): http://[${ip#*|}]:3000/"
            else
                # IPv4:
                echo "  container URL (IPv4): http://${ip#*|}:3000/"
            fi
        done
    fi
    echo
    info_searx

    [[ -n ${1} ]] &&  err_msg "$1"
}

info_searx() {
    # shellcheck disable=SC1117
    cat <<EOF
To activate result and image proxy in SearXNG read:
  https://docs.searxng.org/admin/morty.html
Check settings in file ${SEARXNG_SETTINGS_PATH} ...
  result_proxy:
      url : ${PUBLIC_URL_MORTY}
  server:
      image_proxy : True
EOF
}

main() {
    required_commands \
        sudo install git wget curl \
        || exit

    local _usage="ERROR: unknown or missing $1 command $2"

    case $1 in
        --getenv)  var="$2"; echo "${!var}"; exit 0;;
        -h|--help) usage; exit 0;;

        shell)
            sudo_or_exit
            interactive_shell "${SERVICE_USER}"
            ;;
        inspect)
            case $2 in
                service)
                    sudo_or_exit
                    inspect_service
                    ;;
                *) usage "$_usage"; exit 42;;
            esac ;;
        reinstall)
            rst_title "re-install $SERVICE_NAME" part
            sudo_or_exit
            case $2 in
                all)
                    remove_all
                    install_all
                    ;;
                *) usage "$_usage"; exit 42;;
            esac ;;
        install)
            rst_title "$SERVICE_NAME" part
            sudo_or_exit
            case $2 in
                all) install_all ;;
                check)
                    rst_title "Check morty installation" part
                    install_check
                    ;;
                user) assert_user ;;
                *) usage "$_usage"; exit 42;;
            esac ;;
        update)
            sudo_or_exit
            case $2 in
                morty) update_morty ;;
                *) usage "$_usage"; exit 42;;
            esac ;;
        remove)
            sudo_or_exit
            case $2 in
                all) remove_all;;
                user) drop_service_account "${SERVICE_USER}" ;;
                *) usage "$_usage"; exit 42;;
            esac ;;
        activate)
            sudo_or_exit
            case $2 in
                service)  systemd_activate_service "${SERVICE_NAME}" ;;
                *) usage "$_usage"; exit 42;;
            esac ;;
        deactivate)
            sudo_or_exit
            case $2 in
                service)  systemd_deactivate_service "${SERVICE_NAME}" ;;
                *) usage "$_usage"; exit 42;;
            esac ;;
        apache)
            sudo_or_exit
            case $2 in
                install) install_apache_site ;;
                remove) remove_apache_site ;;
                *) usage "$_usage"; exit 42;;
            esac ;;
        nginx)
            sudo_or_exit
            case $2 in
                install) install_nginx_site ;;
                remove) remove_nginx_site ;;
                *) usage "$_usage"; exit 42;;
            esac ;;
        info)
            case $2 in
                searx) info_searx ;;
                *) usage "$_usage"; exit 42;;
            esac ;;
        option)
            sudo_or_exit
            case $2 in
                new-key) set_new_key ;;
                debug-on)  enable_debug ;;
                debug-off)  disable_debug ;;
                *) usage "$_usage"; exit 42;;
            esac ;;
        doc) rst-doc ;;
        *) usage "ERROR: unknown or missing command $1"; exit 42;;
    esac
}

install_all() {

    MORTY_KEY="$(head -c 32 /dev/urandom | base64)"

    rst_title "Install $SERVICE_NAME (service)"
    assert_user
    wait_key
    go.golang "${GO_VERSION}" "${SERVICE_USER}"
    wait_key
    install_morty
    wait_key
    systemd_install_service "${SERVICE_NAME}" "${SERVICE_SYSTEMD_UNIT}"
    wait_key
    if ! service_is_available "http://${MORTY_LISTEN}" ; then
        err_msg "Morty is not listening on: http://${MORTY_LISTEN}"
    fi
    if apache_is_installed; then
        info_msg "Apache is installed on this host."
        if ask_yn "Do you want to install a reverse proxy (ProxyPass)" Yn; then
            install_apache_site
        fi
    elif nginx_is_installed; then
        info_msg "nginx is installed on this host."
        if ask_yn "Do you want to install a reverse proxy (ProxyPass)" Yn; then
            install_nginx_site
        fi
    fi
    info_searx
    if ask_yn "Add image and result proxy to SearXNG settings.yml?" Yn; then
        "${REPO_ROOT}/utils/searx.sh" option result-proxy "${PUBLIC_URL_MORTY}" "${MORTY_KEY}"
        "${REPO_ROOT}/utils/searx.sh" option image-proxy-on
    fi

    if ask_yn "Do you want to inspect the installation?" Ny; then
        inspect_service
    fi

}

install_check() {

    if service_account_is_available "$SERVICE_USER"; then
        info_msg "service account $SERVICE_USER available."
    else
        err_msg "service account $SERVICE_USER not available!"
    fi
    if go_is_available "$SERVICE_USER"; then
        info_msg "~$SERVICE_USER: go is installed"
    else
        err_msg "~$SERVICE_USER: go is not installed"
    fi
    if morty_is_installed; then
        info_msg "~$SERVICE_USER: morty app is installed"
    else
        err_msg "~$SERVICE_USER: morty app is not installed!"
    fi

    if ! service_is_available "http://${MORTY_LISTEN}" ; then
        err_msg "Morty is not listening on: http://${MORTY_LISTEN}"
        echo -e "${_Green}stop with [${_BCyan}CTRL-C${_Green}] or .."
        wait_key
    fi

    if ! service_is_available "${PUBLIC_URL_MORTY}"; then
        warn_msg "Public service at ${PUBLIC_URL_MORTY} is not available!"
        if ! in_container; then
            warn_msg "Check if public name is correct and routed or use the public IP from above."
        fi
    fi

    if [[ "${GO_VERSION}" > "$(go_version)" ]]; then
        warn_msg "golang ($(go_version)) needs to be $GO_VERSION at least"
        warn_msg "you need to reinstall $SERVICE_USER --> $0 reinstall all"
    else
        info_msg "golang $(go_version) is installed (min needed is: $GO_VERSION)"
    fi
}

go_version(){
    go.version "${SERVICE_USER}"
}

remove_all() {
    rst_title "De-Install $SERVICE_NAME (service)"

    rst_para "\
It goes without saying that this script can only be used to remove
installations that were installed with this script."

    if systemd_remove_service "${SERVICE_NAME}" "${SERVICE_SYSTEMD_UNIT}"; then
        drop_service_account "${SERVICE_USER}"
    fi
}

assert_user() {
    rst_title "user $SERVICE_USER" section
    echo
    tee_stderr 1 <<EOF | bash | prefix_stdout
useradd --shell /bin/bash --system \
 --home-dir "$SERVICE_HOME" \
 --comment 'Web content sanitizer proxy' $SERVICE_USER
mkdir "$SERVICE_HOME"
chown -R "$SERVICE_GROUP:$SERVICE_GROUP" "$SERVICE_HOME"
groups $SERVICE_USER
EOF
    SERVICE_HOME="$(sudo -i -u "$SERVICE_USER" echo \$HOME)"
    export SERVICE_HOME
    echo "export SERVICE_HOME=$SERVICE_HOME"

    tee_stderr <<EOF | sudo -i -u "$SERVICE_USER"
touch $GO_ENV
grep -qFs -- 'source "$GO_ENV"' ~/.profile || echo 'source "$GO_ENV"' >> ~/.profile
EOF
}

morty_is_installed() {
    [[ -f $SERVICE_HOME/go-apps/bin/morty ]]
}

install_morty() {
    rst_title "Install morty in user's ~/go-apps" section
    echo
    go.install github.com/asciimoo/morty@latest "${SERVICE_USER}"
}

update_morty() {
    rst_title "Update morty" section
    echo
    go.install github.com/asciimoo/morty@latest "${SERVICE_USER}"
}

set_service_env_debug() {

    # usage:  set_service_env_debug [false|true]

    # shellcheck disable=SC2034
    local SERVICE_ENV_DEBUG="${1:-false}"
    if systemd_remove_service "${SERVICE_NAME}" "${SERVICE_SYSTEMD_UNIT}"; then
        systemd_install_service "${SERVICE_NAME}" "${SERVICE_SYSTEMD_UNIT}"
    fi
}

inspect_service() {

    rst_title "service status & log"

    cat <<EOF

sourced ${DOT_CONFIG} :
  SERVICE_USER        : ${SERVICE_USER}
  SERVICE_HOME        : ${SERVICE_HOME}
  PUBLIC_URL_MORTY:   : ${PUBLIC_URL_MORTY}
  MORTY_LISTEN:       : ${MORTY_LISTEN}

EOF
    install_log_searx_instance

    install_check

    if in_container; then
        lxc_suite_info
    else
        info_msg "public URL --> ${PUBLIC_URL_MORTY}"
        info_msg "morty URL --> http://${MORTY_LISTEN}"
    fi

    local _debug_on
    if ask_yn "Enable morty debug mode (needs reinstall of systemd service)?"; then
        enable_debug
        _debug_on=1
    else
        systemctl --no-pager -l status "${SERVICE_NAME}"
    fi
    echo

    # shellcheck disable=SC2059
    printf "// use ${_BCyan}CTRL-C${_creset} to stop monitoring the log"
    read -r -s -n1 -t 5
    echo
    while true;  do
        trap break 2
        journalctl -f -u "${SERVICE_NAME}"
    done

    if [[ $_debug_on == 1 ]]; then
        FORCE_SELECTION=Y disable_debug
    fi
    return 0
}

enable_debug() {
    warn_msg "Do not enable debug in production environments!!"
    info_msg "Enabling debug option needs to reinstall systemd service!"
    set_service_env_debug true
}

disable_debug() {
    info_msg "Disabling debug option needs to reinstall systemd service!"
    set_service_env_debug false
}


set_new_key() {
    rst_title "Set morty key"
    echo

    MORTY_KEY="$(head -c 32 /dev/urandom | base64)"
    info_msg "morty key: '${MORTY_KEY}'"

    warn_msg "this will need to reinstall services .."
    MSG="${_Green}press any [${_BCyan}KEY${_Green}] to continue // stop with [${_BCyan}CTRL-C${_creset}]" wait_key

    systemd_install_service "${SERVICE_NAME}" "${SERVICE_SYSTEMD_UNIT}"
    "${REPO_ROOT}/utils/searx.sh" option result-proxy "${PUBLIC_URL_MORTY}" "${MORTY_KEY}"
    "${REPO_ROOT}/utils/searx.sh" option image-proxy-on
}


install_apache_site() {

    rst_title "Install Apache site $APACHE_MORTY_SITE"

    rst_para "\
This installs a reverse proxy (ProxyPass) into apache site (${APACHE_MORTY_SITE})"

    ! apache_is_installed && err_msg "Apache is not installed."

    if ! ask_yn "Do you really want to continue?" Yn; then
        return
    else
        install_apache
    fi

    apache_install_site "${APACHE_MORTY_SITE}"

    info_msg "testing public url .."
    if ! service_is_available "${PUBLIC_URL_MORTY}"; then
        err_msg "Public service at ${PUBLIC_URL_MORTY} is not available!"
    fi
}

remove_apache_site() {

    rst_title "Remove Apache site $APACHE_MORTY_SITE"

    rst_para "\
This removes apache site ${APACHE_MORTY_SITE}."

    ! apache_is_installed && err_msg "Apache is not installed."

    if ! ask_yn "Do you really want to continue?" Yn; then
        return
    fi

    apache_remove_site "$APACHE_MORTY_SITE"
}

install_nginx_site() {

    rst_title "Install nginx site $NGINX_MORTY_SITE"

    rst_para "\
This installs a reverse proxy (ProxyPass) into nginx site (${NGINX_MORTY_SITE})"

    ! nginx_is_installed && err_msg "nginx is not installed."

    if ! ask_yn "Do you really want to continue?" Yn; then
        return
    else
        install_nginx
    fi

    "${REPO_ROOT}/utils/searx.sh" install uwsgi

    # shellcheck disable=SC2034
    SEARXNG_SRC=$("${REPO_ROOT}/utils/searx.sh" --getenv SEARXNG_SRC)
    # shellcheck disable=SC2034
    SEARXNG_URL_PATH=$("${REPO_ROOT}/utils/searx.sh" --getenv SEARXNG_URL_PATH)
    nginx_install_app "${NGINX_MORTY_SITE}"

    info_msg "testing public url .."
    if ! service_is_available "${PUBLIC_URL_MORTY}"; then
        err_msg "Public service at ${PUBLIC_URL_MORTY} is not available!"
    fi
}

remove_nginx_site() {

    rst_title "Remove nginx site $NGINX_MORTY_SITE"

    rst_para "\
This removes nginx site ${NGINX_MORTY_SITE}."

    ! nginx_is_installed && err_msg "nginx is not installed."

    if ! ask_yn "Do you really want to continue?" Yn; then
        return
    fi

    nginx_remove_site "$NGINX_MORTY_SITE"

}

rst-doc() {

    eval "echo \"$(< "${REPO_ROOT}/docs/build-templates/morty.rst")\""

    echo -e "\n.. START install systemd unit"
    cat <<EOF
.. tabs::

   .. group-tab:: systemd

      .. code:: bash

EOF
    eval "echo \"$(< "${TEMPLATES}/${SERVICE_SYSTEMD_UNIT}")\"" | prefix_stdout "         "
    echo -e "\n.. END install systemd unit"

    # for DIST_NAME in ubuntu-20.04 arch fedora centos; do
    #     (
    #         DIST_ID=${DIST_NAME%-*}
    #         DIST_VERS=${DIST_NAME#*-}
    #         [[ $DIST_VERS =~ $DIST_ID ]] && DIST_VERS=
    #         # ...
    #     )
    # done
}


# ----------------------------------------------------------------------------
main "$@"
# ----------------------------------------------------------------------------