#!/bin/bash
if [ $(id -u) -ne 0 ]; then
    sudo "${0}" && exit 0
    exit 1
fi

source /cis/core/base.module.sh



function checkPreconditions() {
    local _MONITOR_DIR
    _MONITOR_DIR="${CIS[DOMAINDEFINITIONS]?"Missing CIS_DOMAINDEFINITIONS"}monitor/"
    readonly _MONITOR_DIR

    [ -d "${_MONITOR_DIR:?"Missing MONITOR_DIR"}checks" ] \
        && return 0

    echo "No folder for your defined checks found: ${_MONITOR_DIR:?"Missing MONITOR_DIR"}checks"
    echo "Please create it and add all your custom monitoring checks there, following this convention: 'NAME_OF_THE_CHECK.on'"
    echo "A check has to be switched 'on' to be executed, so you can rename a check to 'NAME_OF_THE_CHECK.off' and it will be ignored."
    echo
    echo "You can copy the file '/cis/definitions/default/checks/EXAMPLE_CHECK.off' to your check definitions folder and modify it."
    return 1
}



function printSelectedDefinition() {
    local _MONITOR_DIR _FILE_DEFINED_DOMAIN _FILE_DEFINED_DEFAULT _SCRIPT_DEFINED_DEFAULT
    _MONITOR_DIR="${CIS[DOMAINDEFINITIONS]?"Missing CIS_DOMAINDEFINITIONS"}monitor/"
    _FILE_DEFINED_DOMAIN="${_MONITOR_DIR:?"Missing MONITOR_DIR"}${1:?"Missing CURRENT_FULLFILE"}"
    _FILE_DEFINED_DEFAULT="${CIS[DEFAULTDEFINITIONS]}monitor/${1:?"Missing CURRENT_FULLFILE"}"
    _SCRIPT_DEFINED_DEFAULT="${CIS[SCRIPTSROOT]}monitor/${1:?"Missing CURRENT_FULLFILE"}"
    readonly _MONITOR_DIR _FILE_DEFINED_DOMAIN _FILE_DEFINED_DEFAULT _SCRIPT_DEFINED_DEFAULT

    [ -s "${_FILE_DEFINED_DOMAIN}" ] \
        && echo "${_FILE_DEFINED_DOMAIN}" \
        && return 0

    [ -s "${_FILE_DEFINED_DEFAULT}" ] \
        && echo "${_FILE_DEFINED_DEFAULT}" \
        && return 0

    [ -s "${_SCRIPT_DEFINED_DEFAULT}" ] \
        && echo "${_SCRIPT_DEFINED_DEFAULT}" \
        && return 0

    return 1
}

function setupPublicFile() {
    ! [ -d "/var/www/html" ] \
        && echo "Missing folder '/var/www/html'. Is a webserver installed?" \
        && return 1

    [ -L "/var/www/html/${1:?"Missing filename"}" ] \
        && [ "$(readlink -f /var/www/html/${1:?"Missing filename"})" == "$(printSelectedDefinition ${1:?"Missing filename"})" ] \
        && echo "Link '/var/www/html/${1:?"Missing filename"}' already exists pointing to the expected file:" \
        && echo "  - '$(readlink -f /var/www/html/${1:?"Missing filename"})'" \
        && return 0

    ln -f -s "$(printSelectedDefinition ${1:?"Missing filename"})" "/var/www/html/${1:?"Missing filename"}" \
        && echo "Link '/var/www/html/${1:?"Missing filename"}' created successfully:" \
        && echo "  - '$(readlink -f /var/www/html/${1:?"Missing filename"})'" \
        && return 0
}

echo "Setup the monitoring host that monitors the others ... " \
    && checkPreconditions \
    && setupPublicFile "check.html" \
    && setupPublicFile "check.css" \
    && setupPublicFile "logo.png" \
    && exit 0

exit 1