#!/usr/bin/env bash
# shellcheck disable=SC2086,SC1091
GS_RUN_START=$SECONDS

# GRAVITY SYNC BY VMSTAN #####################
PROGRAM='Gravity Sync'
GS_VERSION='4.0.0'

# For documentation or the changelog/updates visit https://github.com/vmstan/gravity-sync
# Requires Pi-Hole 5.x or higher already be installed, for help visit https://pi-hole.net

# REQUIRED SETTINGS ##########################

# Run 'gravity-sync config' to get started, it will customize the script for your environment
# You should NOT to change the values of any variables here, to customize your install
# Only add replacement variables to gravity-sync.conf, which will overwrite these defaults
# Gravity Sync 4.0 introduces a new configuration file format, there is no direct upgrade path

# CUSTOM VARIABLES ###########################

# Pi-hole Folder/File Customization - Only need to be customized when using containers
LOCAL_PIHOLE_DIRECTORY='/etc/pihole' 			# replace in gravity-sync.conf to overwrite
REMOTE_PIHOLE_DIRECTORY='/etc/pihole'			# replace in gravity-sync.conf to overwrite
LOCAL_DNSMASQ_DIRECTORY='/etc/dnsmasq.d'        # replace in gravity-sync.conf to overwrite
REMOTE_DNSMASQ_DIRECTORY='/etc/dnsmasq.d'       # replace in gravity-sync.conf to overwrite
LOCAL_FILE_OWNER='pihole:pihole'			    # replace in gravity-sync.conf to overwrite
REMOTE_FILE_OWNER='pihole:pihole'			    # replace in gravity-sync.conf to overwrite

# Pi-hole Docker/Podman container name - Docker will pattern match anything set below
LOCAL_DOCKER_CONTAINER='pihole'					# replace in gravity-sync.conf to overwrite
REMOTE_DOCKER_CONTAINER='pihole'				# replace in gravity-sync.conf to overwrite

# STANDARD VARIABLES #########################

DEFAULT_PIHOLE_DIRECTORY='/etc/pihole'			# Default Pi-hole data directory
LOCAL_PIHOLE_BINARY='/usr/local/bin/pihole' 	# Local Pi-hole binary directory (default)
REMOTE_PIHOLE_BINARY='/usr/local/bin/pihole' 	# Remote Pi-hole binary directory (default)
LOCAL_FTL_BINARY='/usr/bin/pihole-FTL'          # Local FTL binary directory (default)
REMOTE_FTL_BINARY='/usr/bin/pihole-FTL'         # Remote FTL binary directory (default)
LOCAL_DOCKER_BINARY='/usr/bin/docker'		    # Local Docker binary directory (default)
REMOTE_DOCKER_BINARY='/usr/bin/docker'		    # Remote Docker binary directory (default)
LOCAL_PODMAN_BINARY='/usr/bin/podman'           # Local Podman binary directory (default)
REMOTE_PODMAN_BINARY='/usr/bin/podman'          # Remote Podman binary directory (default)
PIHOLE_CONTAINER_IMAGE='pihole/pihole'          # Official Pi-hole container image name

###############################################
####### THE NEEDS OF THE MANY, OUTWEIGH #######
############ THE NEEDS OF THE FEW #############
###############################################

PH_GRAVITY_FI='gravity.db' 			            # Pi-hole database file name
PH_CUSTOM_DNS='custom.list'			            # Pi-hole DNS lookup filename
PH_CNAME_CONF='05-pihole-custom-cname.conf'     # DNSMASQ CNAME alias file

# Backup Customization
GS_BACKUP_TIMEOUT='240'                         # replace in gravity-sync.conf to overwrite
GS_BACKUP_INTEGRITY_WAIT='5'                    # replace in gravity-sync.conf to overwrite
GS_BACKUP_EXT='gsb'                             # replace in gravity-sync.conf to overwrite

# GS Folder/File Locations
GS_FILEPATH='/usr/local/bin/gravity-sync'			
GS_ETC_PATH="/etc/gravity-sync"		            # replace in gravity-sync.conf to overwrite
GS_CONFIG_FILE='gravity-sync.conf' 	            # replace in gravity-sync.conf to overwrite
GS_SYNCING_LOG='gs-sync.log' 		            # replace in gravity-sync.conf to overwrite
GS_GRAVITY_FI_MD5_LOG='gs-gravity.md5'          # replace in gravity-sync.conf to overwrite
GS_CUSTOM_DNS_MD5_LOG='gs-clist.md5'            # replace in gravity-sync.conf to overwrite
GS_CNAME_CONF_MD5_LOG='gs-cname.md5'            # replace in gravity-sync.conf to overwrite

# SSH Customization
GS_SSH_PORT='22' 						        # replace in gravity-sync.conf to overwrite
GS_SSH_PKIF="${GS_ETC_PATH}/gravity-sync.rsa"   # replace in gravity-sync.conf to overwrite

# Github Customization
GS_LOCAL_REPO="${GS_ETC_PATH}/.gs"              # replace in gravity-sync.conf to overwrite

# OS Settings
OS_DAEMON_PATH='/etc/systemd/system'
OS_TMP='/tmp'
OS_SSH_CMD='ssh'

# Interface Settings
UI_GRAVITY_NAME='Gravity Database'
UI_CUSTOM_NAME='DNS Records'
UI_CNAME_NAME='DNS CNAMEs'
# Reused UI Text
UI_CORE_LOADING='Loading'
UI_CORE_EVALUATING='Evaluating arguments'
UI_CORE_INIT="Initializing ${PROGRAM} (${GS_VERSION})"
UI_CORE_APP='Pi-hole'
UI_CORE_APP_DNS='DNSMASQ'
UI_EXIT_CALC_END='after'
UI_EXIT_ABORT='exited'
UI_EXIT_COMPLETE='completed'
UI_EXIT_CALC_TIMER='seconds'
UI_HASHING_HASHING='Hashing the remote'
UI_HASHING_COMPARING='Comparing to the local'
UI_HASHING_DIFFERENCE='Differences detected in the'
UI_HASHING_DETECTED='has been detected on the'
UI_HASHING_NOT_DETECTED='not detected on the'
UI_HASHING_REMOTE="remote ${UI_CORE_APP}"
UI_HASHING_LOCAL="local ${UI_CORE_APP}"
UI_HASHING_REHASHING='Rehashing the remote'
UI_HASHING_RECOMPARING='Recomparing to local'
UI_VALIDATING='Validating pathways to'
UI_VALIDATING_FAIL_CONTAINER='Unable to validate running container instance of'
UI_VALIDATING_FAIL_FOLDER='Unable to validate configuration folder for'
UI_VALIDATING_FAIL_BINARY='Unable to validate the availability of'
UI_SET_LOCAL_FILE_OWNERSHIP='Setting file ownership on'
UI_SET_FILE_PERMISSION='Setting file permissions on'
UI_PULL_REMOTE='Pulling the remote'
UI_PUSH_LOCAL='Pushing the local'
UI_REPLACE_LOCAL='Replacing the local'
UI_FTLDNS_CONFIG_PULL_RELOAD='Reloading local FTLDNS services'
UI_FTLDNS_CONFIG_PUSH_RELOAD='Reloading remote FTLDNS services'
UI_LOGGING_RECENT_COMPLETE='Recent complete executions of'
UI_BACKUP_REMOTE='Performing backup of remote'
UI_BACKUP_LOCAL='Performing backup of local'
UI_BACKUP_INTEGRITY="Checking ${UI_GRAVITY_NAME} copy integrity"
UI_BACKUP_INTEGRITY_FAILED='Integrity check has failed for the remote'
UI_BACKUP_INTEGRITY_DELETE='Removing failed copies'
UI_CONFIG_ALREADY='already exists'
UI_CONFIG_CONFIRM='Proceeding will replace your existing configuration'
UI_CONFIG_ERASING='Erasing existing'
UI_CONFIG_LOCAL='local host'
UI_CONFIG_CONTAINER_NAME='container name'
UI_CONFIG_SAVING='Saving'
UI_CONFIG_ETC_VOLUME_PATH="'etc' volume path"
UI_CONFIG_VOLUME_OWNER='volume ownership'

## Script Colors
RED='\033[0;91m'
GREEN='\033[0;92m'
CYAN='\033[0;96m'
YELLOW='\033[0;93m'
PURPLE='\033[0;95m'
BLUE='\033[0;94m'
BOLD='\033[1m'
NC='\033[0m'

## Message Codes
FAIL="${RED}✗${NC}"
WARN="${PURPLE}!${NC}"
GOOD="${GREEN}✓${NC}"
STAT="${CYAN}∞${NC}"
INFO="${YELLOW}»${NC}"
INF1="${CYAN}›${NC}"
NEED="${BLUE}?${NC}"
LOGO="${PURPLE}∞${NC}"

## Echo Stack
### Informative
function echo_info {
    echo -e "${INFO} ${YELLOW}${MESSAGE}${NC}"
}

function echo_prompt {
    echo -e "${INF1} ${CYAN}${MESSAGE}${NC}"
}

### Warning
function echo_warn {
    echo -e "${WARN} ${PURPLE}${MESSAGE}${NC}"
}

### Executing
function echo_stat {
    echo -en "${STAT} ${MESSAGE}"
}

### Success
function echo_good {
    echo -e "\r${GOOD} ${MESSAGE}"
}

### Success
function echo_good_clean {
    echo -e "\r${GOOD} ${MESSAGE}"
}

### Failure
function echo_fail {
    echo -e "\r${FAIL} ${MESSAGE}"
}

### Request
function echo_need {
    echo -en "${NEED} ${BOLD}${MESSAGE}:${NC} "
}

### Indent
function echo_over {
    echo -e "  ${MESSAGE}"
}

### Gravity Sync Logo
function echo_grav {
    echo -e "${LOGO} ${BOLD}${MESSAGE}${NC}"
}

### Lines
function echo_blank {
    echo -e ""
}

# Standard Output
function start_gs {
    MESSAGE="${UI_CORE_INIT}"
    echo_grav
    
    import_gs_config
    detect_local_pihole
    detect_remote_pihole
    detect_gs_peer
    set_pihole_exec
    
    MESSAGE="${UI_CORE_EVALUATING}"
    echo_stat
    
    validate_sudo_status
}

# Standard Output No Config
function start_gs_no_config {
    MESSAGE="${UI_CORE_INIT}"
    echo_grav
    
    MESSAGE="${UI_CORE_EVALUATING}"
    echo_stat
}

## Import Settings
function import_gs_config {
    MESSAGE="${UI_CORE_LOADING} ${GS_CONFIG_FILE}"
    echo -en "${STAT} $MESSAGE"
    if [ -f ${GS_ETC_PATH}/${GS_CONFIG_FILE} ]; then
        # shellcheck source=/etc/gravity-sync/gravity-sync.conf
        source ${GS_ETC_PATH}/${GS_CONFIG_FILE}
        error_validate
    else
        echo_fail
        
        MESSAGE="Missing ${GS_CONFIG_FILE}"
        echo_warn
        
        GS_TASK_TYPE='CONFIG'
        config_generate
    fi
}

## Invalid Tasks
function task_invalid {
    echo_fail
    list_gs_arguments
}

## Error Validation
function error_validate {
    if [ "$?" != "0" ]; then
        echo_fail
        exit 1
    else
        echo_good
    fi
}

function  set_pihole_exec {
    if [ "$LOCAL_PIHOLE_TYPE" == "default" ]; then
        PH_EXEC="${LOCAL_PIHOLE_BINARY}"
        FTL_EXEC="${LOCAL_FTL_BINARY}"
    elif [ "$LOCAL_PIHOLE_TYPE" == "docker" ]; then
        PH_EXEC="sudo ${LOCAL_DOCKER_BINARY} exec $(sudo ${LOCAL_DOCKER_BINARY} ps -qf name=${LOCAL_DOCKER_CONTAINER}) pihole"
        FTL_EXEC="sudo ${LOCAL_DOCKER_BINARY} exec $(sudo ${LOCAL_DOCKER_BINARY} ps -qf name=${LOCAL_DOCKER_CONTAINER}) pihole-FTL"
    elif [ "$LOCAL_PIHOLE_TYPE" == "podman" ]; then
        PH_EXEC="sudo ${LOCAL_PODMAN_BINARY} exec ${LOCAL_DOCKER_CONTAINER} pihole"
        FTL_EXEC="sudo ${LOCAL_PODMAN_BINARY} exec ${LOCAL_DOCKER_CONTAINER} pihole-FTL"
    fi
    
    if [ "$REMOTE_PIHOLE_TYPE" == "default" ]; then
        RH_EXEC="${REMOTE_PIHOLE_BINARY}"
        RFTL_EXEC="${REMOTE_FTL_BINARY}"
    elif [ "$REMOTE_PIHOLE_TYPE" == "docker" ]; then
        RH_EXEC="sudo ${REMOTE_DOCKER_BINARY} exec \$(sudo ${REMOTE_DOCKER_BINARY} ps -qf name=${REMOTE_DOCKER_CONTAINER}) pihole"
        RFTL_EXEC="sudo ${REMOTE_DOCKER_BINARY} exec \$(sudo ${REMOTE_DOCKER_BINARY} ps -qf name=${REMOTE_DOCKER_CONTAINER}) pihole-FTL"
    elif [ "$REMOTE_PIHOLE_TYPE" == "podman" ]; then
        RH_EXEC="sudo ${REMOTE_PODMAN_BINARY} exec ${REMOTE_DOCKER_CONTAINER} pihole"
        RFTL_EXEC="sudo ${REMOTE_PODMAN_BINARY} exec ${REMOTE_DOCKER_CONTAINER} pihole"
    fi
}

## Compare Task
function task_compare {
    GS_TASK_TYPE='COMPARE'
    MESSAGE="${MESSAGE}: ${GS_TASK_TYPE}"
    echo_good
    
    show_target
    validate_ph_folders
    validate_dns_folders
    previous_md5
    md5_compare
    exit_with_changes
}

## Pull Task
function task_pull {
    GS_TASK_TYPE='PULL'
    MESSAGE="${MESSAGE}: ${GS_TASK_TYPE}"
    echo_good
    show_target
    validate_ph_folders
    validate_dns_folders
    pull_gs
    exit
}

## Pull Gravity
function pull_gs_grav {
    
    backup_local_gravity
    backup_remote_gravity
    backup_remote_gravity_integrity
    
    MESSAGE="${UI_PULL_REMOTE} ${UI_GRAVITY_NAME}"
    echo_stat
    RSYNC_REPATH="sudo rsync"
    RSYNC_SOURCE="${REMOTE_USER}@${REMOTE_HOST}:${REMOTE_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI}.${GS_BACKUP_EXT}"
    RSYNC_TARGET="${OS_TMP}/${PH_GRAVITY_FI}.${GS_BACKUP_EXT}"
    create_rsync_cmd
    
    MESSAGE="${UI_REPLACE_LOCAL} ${UI_GRAVITY_NAME}"
    echo_stat
    sudo mv ${OS_TMP}/${PH_GRAVITY_FI}.${GS_BACKUP_EXT} ${LOCAL_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI} >/dev/null 2>&1
    error_validate
    
    validate_gravity_permissions
}

## Pull Custom
function pull_gs_custom {
    if [ "$REMOTE_PH_CUSTOM_DNS" == "1" ]; then
        backup_local_custom
        backup_remote_custom
        
        MESSAGE="${UI_PULL_REMOTE} ${UI_CUSTOM_NAME}"
        echo_stat
        RSYNC_REPATH="sudo rsync"
        RSYNC_SOURCE="${REMOTE_USER}@${REMOTE_HOST}:${REMOTE_PIHOLE_DIRECTORY}/${PH_CUSTOM_DNS}.${GS_BACKUP_EXT}"
        RSYNC_TARGET="${OS_TMP}/${PH_CUSTOM_DNS}.${GS_BACKUP_EXT}"
        create_rsync_cmd
        
        MESSAGE="${UI_REPLACE_LOCAL} ${UI_CUSTOM_NAME}"
        echo_stat
        sudo mv ${OS_TMP}/${PH_CUSTOM_DNS}.${GS_BACKUP_EXT} ${LOCAL_PIHOLE_DIRECTORY}/${PH_CUSTOM_DNS} >/dev/null 2>&1
        error_validate
        
        validate_custom_permissions
    fi
}

## Pull CNAME
function pull_gs_cname {
    if [ "$REMOTE_CNAME_DNS" == "1" ]; then
        backup_local_cname
        backup_remote_cname
        
        MESSAGE="${UI_PULL_REMOTE} ${UI_CNAME_NAME}"
        echo_stat
        RSYNC_REPATH="sudo rsync"
        RSYNC_SOURCE="${REMOTE_USER}@${REMOTE_HOST}:${REMOTE_PIHOLE_DIRECTORY}/${PH_CNAME_CONF}.${GS_BACKUP_EXT}"
        RSYNC_TARGET="${OS_TMP}/${PH_CNAME_CONF}.${GS_BACKUP_EXT}"
        create_rsync_cmd
        
        MESSAGE="${UI_REPLACE_LOCAL} ${UI_CNAME_NAME}"
        echo_stat
        sudo mv ${OS_TMP}/${PH_CNAME_CONF}.${GS_BACKUP_EXT} ${LOCAL_DNSMASQ_DIRECTORY}/${PH_CNAME_CONF} >/dev/null 2>&1
        error_validate
        
        validate_cname_permissions
    fi
}

## Pull Reload
function pull_gs_reload {
    sleep 1
    
    MESSAGE="Updating local FTLDNS configuration"
    echo_stat
    ${PH_EXEC} restartdns reload-lists >/dev/null 2>&1
    error_validate
    
    if [ "${GS_TASK_TYPE}" == SMART ]; then 
        if [ "${REMOTE_DNS_CHANGE}" == "1" ] || [ "${LOCAL_DNS_CHANGE}" == "1" ] || [ "${REMOTE_CNAME_CHANGE}" == "1" ] || [ "${LOCAL_CNAME_CHANGE}" == "1" ]; then
            MESSAGE="${UI_FTLDNS_CONFIG_PULL_RELOAD}"
            echo_stat
            ${PH_EXEC} restartdns >/dev/null 2>&1
            error_validate
        fi
    else
        MESSAGE="${UI_FTLDNS_CONFIG_PULL_RELOAD}"
        echo_stat
        ${PH_EXEC} restartdns >/dev/null 2>&1
        error_validate
    fi
}

## Pull Function
function pull_gs {
    previous_md5
    md5_compare
    pull_gs_grav
    pull_gs_custom
    pull_gs_cname
    pull_gs_reload
    md5_recheck
    logs_export
    exit_with_changes
}

## Push Task
function task_push {
    GS_TASK_TYPE='PUSH'
    MESSAGE="${MESSAGE}: ${GS_TASK_TYPE}"
    echo_good
    
    show_target
    validate_ph_folders
    validate_dns_folders
    push_gs
    exit
}

## Push Gravity
function push_gs_grav {
    backup_remote_gravity
    backup_local_gravity
    backup_local_gravity_integrity
    
    MESSAGE="${UI_PUSH_LOCAL} ${UI_GRAVITY_NAME}"
    echo_stat
    RSYNC_REPATH="sudo rsync"
    RSYNC_SOURCE="${LOCAL_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI}.${GS_BACKUP_EXT}"
    RSYNC_TARGET="${REMOTE_USER}@${REMOTE_HOST}:${REMOTE_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI}"
    create_rsync_cmd
    
    MESSAGE="${UI_SET_LOCAL_FILE_OWNERSHIP} ${UI_GRAVITY_NAME}"
    echo_stat
    CMD_TIMEOUT=$GS_BACKUP_TIMEOUT
    CMD_REQUESTED="sudo chown ${REMOTE_FILE_OWNER} ${REMOTE_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI}"
    create_ssh_cmd
    
    MESSAGE="${UI_SET_FILE_PERMISSION} ${UI_GRAVITY_NAME}"
    echo_stat
    CMD_TIMEOUT=$GS_BACKUP_TIMEOUT
    CMD_REQUESTED="sudo chmod 664 ${REMOTE_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI}"
    create_ssh_cmd
}

## Push Custom
function push_gs_custom {
    if [ "$REMOTE_PH_CUSTOM_DNS" == "1" ]; then
        backup_remote_custom
        backup_local_custom
        
        MESSAGE="${UI_PUSH_LOCAL} ${UI_CUSTOM_NAME}"
        echo_stat
        RSYNC_REPATH="sudo rsync"
        RSYNC_SOURCE="${LOCAL_PIHOLE_DIRECTORY}/${PH_CUSTOM_DNS}.${GS_BACKUP_EXT}"
        RSYNC_TARGET="${REMOTE_USER}@${REMOTE_HOST}:${REMOTE_PIHOLE_DIRECTORY}/${PH_CUSTOM_DNS}"
        create_rsync_cmd
        
        MESSAGE="${UI_SET_LOCAL_FILE_OWNERSHIP} ${UI_CUSTOM_NAME}"
        echo_stat
        CMD_TIMEOUT=$GS_BACKUP_TIMEOUT
        CMD_REQUESTED="sudo chown root:root ${REMOTE_PIHOLE_DIRECTORY}/${PH_CUSTOM_DNS}"
        create_ssh_cmd
        
        MESSAGE="${UI_SET_FILE_PERMISSION} ${UI_CUSTOM_NAME}"
        echo_stat
        CMD_TIMEOUT=$GS_BACKUP_TIMEOUT
        CMD_REQUESTED="sudo chmod 644 ${REMOTE_PIHOLE_DIRECTORY}/${PH_CUSTOM_DNS}"
        create_ssh_cmd
    fi
}

## Push Custom
function push_gs_cname {
    if [ "$REMOTE_CNAME_DNS" == "1" ]; then
        backup_remote_cname
        backup_local_cname
        
        MESSAGE="${UI_PUSH_LOCAL} ${UI_CNAME_NAME}"
        echo_stat
        RSYNC_REPATH="sudo rsync"
        RSYNC_SOURCE="${LOCAL_PIHOLE_DIRECTORY}/${PH_CNAME_CONF}.${GS_BACKUP_EXT}"
        RSYNC_TARGET="${REMOTE_USER}@${REMOTE_HOST}:${REMOTE_DNSMASQ_DIRECTORY}/${PH_CNAME_CONF}"
        create_rsync_cmd
        
        MESSAGE="${UI_SET_LOCAL_FILE_OWNERSHIP} ${UI_CNAME_NAME}"
        echo_stat
        CMD_TIMEOUT=$GS_BACKUP_TIMEOUT
        CMD_REQUESTED="sudo chown root:root ${REMOTE_DNSMASQ_DIRECTORY}/${PH_CNAME_CONF}"
        create_ssh_cmd
        
                    
        MESSAGE="${UI_SET_FILE_PERMISSION} ${UI_CNAME_NAME}"
        echo_stat
        CMD_TIMEOUT=$GS_BACKUP_TIMEOUT
        CMD_REQUESTED="sudo chmod 644 ${REMOTE_DNSMASQ_DIRECTORY}/${PH_CNAME_CONF}"
        create_ssh_cmd
    fi
}

## Push Reload
function push_gs_reload {
    sleep 1
    
    MESSAGE="Updating remote FTLDNS configuration"
    echo_stat
    CMD_TIMEOUT=$GS_BACKUP_TIMEOUT
    CMD_REQUESTED="${RH_EXEC} restartdns reload-lists"
    create_ssh_cmd
    
    if [ "${GS_TASK_TYPE}" == SMART ]; then 
        if [ "${REMOTE_DNS_CHANGE}" == "1" ] || [ "${LOCAL_DNS_CHANGE}" == "1" ] || [ "${REMOTE_CNAME_CHANGE}" == "1" ] || [ "${LOCAL_CNAME_CHANGE}" == "1" ]; then
            MESSAGE="${UI_FTLDNS_CONFIG_PUSH_RELOAD}"
            echo_stat
            CMD_TIMEOUT=$GS_BACKUP_TIMEOUT
            CMD_REQUESTED="${RH_EXEC} restartdns"
            create_ssh_cmd
        fi
    else
        MESSAGE="${UI_FTLDNS_CONFIG_PUSH_RELOAD}"
        echo_stat
        CMD_TIMEOUT=$GS_BACKUP_TIMEOUT
        CMD_REQUESTED="${RH_EXEC} restartdns"
        create_ssh_cmd
    fi
}

## Push Function
function push_gs {
    previous_md5
    md5_compare
    push_gs_grav
    push_gs_custom
    push_gs_cname
    push_gs_reload
    md5_recheck
    logs_export
    exit_with_changes
}

## Smart Task
function task_smart {
    GS_TASK_TYPE='SMART'
    MESSAGE="${MESSAGE}: ${GS_TASK_TYPE}"
    echo_good
    
    show_target
    validate_ph_folders
    validate_dns_folders
    smart_gs
    exit
}

## Smart Sync Function
function smart_gs {
    MESSAGE="Starting ${GS_TASK_TYPE} Analysis"
    echo_info
    
    previous_md5
    md5_compare
    
    REMOTE_GRAVITY_CHANGE="0"
    LOCAL_GRAVITY_CHANGE="0"
    REMOTE_DNS_CHANGE="0"
    LOCAL_DNS_CHANGE="0"
    REMOTE_CNAME_CHANGE="0"
    LOCAL_CNAME_CHANGE="0"
    
    if [ "${REMOTE_DB_MD5}" != "${LAST_REMOTE_DB_MD5}" ]; then
        REMOTE_GRAVITY_CHANGE="1"
    fi
    
    if [ "${LOCAL_DB_MD5}" != "${LAST_LOCAL_DB_MD5}" ]; then
        LOCAL_GRAVITY_CHANGE="1"
    fi
    
    if [ "${REMOTE_GRAVITY_CHANGE}" == "${LOCAL_GRAVITY_CHANGE}" ]; then
        if [ "${REMOTE_GRAVITY_CHANGE}" != "0" ]; then
            MESSAGE="Both ${UI_GRAVITY_NAME} have changed"
            echo_warn
            
            REMOTE_GRAVITY_DATE=$(${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} "stat -c %Y ${REMOTE_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI}")
            LOCAL_GRAVITY_DATE=$(stat -c %Y ${LOCAL_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI})
            
            if (( "$REMOTE_GRAVITY_DATE" >= "$LOCAL_GRAVITY_DATE" )); then
                MESSAGE="Remote ${UI_GRAVITY_NAME} was last changed"
                echo_warn
                
                pull_gs_grav
                GS_PULL_RESTART="1"
            else
                MESSAGE="Local ${UI_GRAVITY_NAME} was last changed"
                echo_warn
                
                push_gs_grav
                GS_PUSH_RESTART="1"
            fi
        fi
    else
        if [ "${REMOTE_GRAVITY_CHANGE}" != "0" ]; then
            pull_gs_grav
            GS_PULL_RESTART="1"
        elif [ "${LOCAL_GRAVITY_CHANGE}" != "0" ]; then
            push_gs_grav
            GS_PUSH_RESTART="1"
        fi
    fi
    
    if [ "${REMOTE_CL_MD5}" != "${LAST_REMOTE_CL_MD5}" ]; then
        REMOTE_DNS_CHANGE="1"
    fi
    
    if [ "${LOCAL_CL_MD5}" != "${LAST_LOCAL_CL_MD5}" ]; then
        LOCAL_DNS_CHANGE="1"
    fi
    
    if [ -f "${LOCAL_PIHOLE_DIRECTORY}/${PH_CUSTOM_DNS}" ]; then
        if [ "${REMOTE_DNS_CHANGE}" == "${LOCAL_DNS_CHANGE}" ]; then
            if [ "${REMOTE_DNS_CHANGE}" != "0" ]; then
                MESSAGE="Both ${UI_CUSTOM_NAME} have changed"
                echo_warn
                
                REMOTE_DNS_DATE=$(${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} "stat -c %Y ${REMOTE_PIHOLE_DIRECTORY}/${PH_CUSTOM_DNS}")
                LOCAL_DNS_DATE=$(stat -c %Y ${LOCAL_PIHOLE_DIRECTORY}/${PH_CUSTOM_DNS})
                
                if (( "$REMOTE_DNS_DATE" >= "$LOCAL_DNS_DATE" )); then
                    MESSAGE="Remote ${UI_CUSTOM_NAME} was last changed"
                    echo_warn
                    
                    pull_gs_custom
                    GS_PULL_RESTART="1"
                else
                    MESSAGE="Local ${UI_CUSTOM_NAME} was last changed"
                    echo_warn
                    
                    push_gs_custom
                    GS_PUSH_RESTART="1"
                fi
            fi
        else
            if [ "${REMOTE_DNS_CHANGE}" != "0" ]; then
                pull_gs_custom
                GS_PULL_RESTART="1"
            elif [ "${LOCAL_DNS_CHANGE}" != "0" ]; then
                push_gs_custom
                GS_PUSH_RESTART="1"
            fi
        fi
    else
        pull_gs_custom
        GS_PULL_RESTART="1"
    fi
    
    if [ "${REMOTE_CN_MD5}" != "${LAST_REMOTE_CN_MD5}" ]; then
        REMOTE_CNAME_CHANGE="1"
    fi
    
    if [ "${LOCAL_CN_MD5}" != "${LAST_LOCAL_CN_MD5}" ]; then
        LOCAL_CNAME_CHANGE="1"
    fi
    
    if [ -f "${LOCAL_DNSMASQ_DIRECTORY}/${PH_CNAME_CONF}" ]; then
        if [ "${REMOTE_CNAME_CHANGE}" == "${LOCAL_CNAME_CHANGE}" ]; then
            if [ "${REMOTE_CNAME_CHANGE}" != "0" ]; then
                MESSAGE="Both ${UI_CNAME_NAME} have Changed"
                echo_warn
                
                REMOTE_CNAME_DATE=$(${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} "stat -c %Y ${REMOTE_DNSMASQ_DIRECTORY}/${PH_CNAME_CONF}")
                LOCAL_CNAME_DATE=$(stat -c %Y ${LOCAL_DNSMASQ_DIRECTORY}/${PH_CNAME_CONF})
                
                if (( "$REMOTE_CNAME_DATE" >= "$LOCAL_CNAME_DATE" )); then
                    MESSAGE="Remote ${UI_CNAME_NAME} was last changed"
                    echo_warn
                    
                    pull_gs_cname
                    GS_PULL_RESTART="1"
                else
                    MESSAGE="Local ${UI_CNAME_NAME} was last changed"
                    echo_warn
                    
                    push_gs_cname
                    GS_PUSH_RESTART="1"
                fi
            fi
        else
            if [ "${REMOTE_CNAME_CHANGE}" != "0" ]; then
                pull_gs_cname
                GS_PULL_RESTART="1"
            elif [ "${LOCAL_CNAME_CHANGE}" != "0" ]; then
                push_gs_cname
                GS_PUSH_RESTART="1"
            fi
        fi
    else
        pull_gs_cname
        GS_PULL_RESTART="1"
    fi
    
    if [ "$GS_PULL_RESTART" == "1" ]; then
        pull_gs_reload
    fi
    
    if [ "$GS_PUSH_RESTART" == "1" ]; then
        push_gs_reload
    fi
    
    md5_recheck
    
    logs_export
    exit_with_changes
}

function backup_local_gravity {
    MESSAGE="${UI_BACKUP_LOCAL} ${UI_GRAVITY_NAME}"
    echo_stat
    
    if [ "$LOCAL_PIHOLE_TYPE" == "default" ]; then
        sudo ${FTL_EXEC} sql ${LOCAL_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI} ".backup '${LOCAL_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI}.${GS_BACKUP_EXT}'"
        error_validate
    elif [ "$LOCAL_PIHOLE_TYPE" == "docker" ]; then
        sudo ${FTL_EXEC} sql ${DEFAULT_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI} ".backup '${DEFAULT_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI}.${GS_BACKUP_EXT}'"
        error_validate
    elif [ "$LOCAL_PIHOLE_TYPE" == "podman" ]; then
        sudo ${FTL_EXEC} sql ${DEFAULT_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI} ".backup '${DEFAULT_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI}.${GS_BACKUP_EXT}'"
        error_validate
    fi
}

function backup_local_gravity_integrity {
    MESSAGE="${UI_BACKUP_INTEGRITY}"
    echo_stat
    
    sleep $GS_BACKUP_INTEGRITY_WAIT

    if [ "$LOCAL_PIHOLE_TYPE" == "default" ]; then
        LOCAL_INTEGRITY_CHECK=$(${FTL_EXEC} sql ${LOCAL_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI}.${GS_BACKUP_EXT} 'PRAGMA integrity_check;' | sed 's/\s.*$//')
        error_validate
    elif [ "$LOCAL_PIHOLE_TYPE" == "docker" ]; then
        LOCAL_INTEGRITY_CHECK=$(${FTL_EXEC} sql ${DEFAULT_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI}.${GS_BACKUP_EXT} 'PRAGMA integrity_check;' | sed 's/\s.*$//')
        error_validate
    elif [ "$LOCAL_PIHOLE_TYPE" == "podman" ]; then
        LOCAL_INTEGRITY_CHECK=$(${FTL_EXEC} sql ${DEFAULT_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI}.${GS_BACKUP_EXT} 'PRAGMA integrity_check;' | sed 's/\s.*$//')
        error_validate
    fi
    
    if [ "$LOCAL_INTEGRITY_CHECK" != 'ok' ]; then
        MESSAGE="${UI_BACKUP_INTEGRITY_FAILED} ${UI_GRAVITY_NAME}"
        echo_fail
        
        MESSAGE="${UI_BACKUP_INTEGRITY_DELETE} ${UI_GRAVITY_NAME}"
        echo_stat
            
        sudo rm ${LOCAL_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI}.${GS_BACKUP_EXT}
        error_validate
        
        exit_no_change
    fi
}

function backup_local_custom {
    if [ -f ${LOCAL_PIHOLE_DIRECTORY}/${PH_CUSTOM_DNS} ]; then
        MESSAGE="${UI_BACKUP_LOCAL} ${UI_CUSTOM_NAME}"
        echo_stat
        
        sudo cp ${LOCAL_PIHOLE_DIRECTORY}/${PH_CUSTOM_DNS} ${LOCAL_PIHOLE_DIRECTORY}/${PH_CUSTOM_DNS}.${GS_BACKUP_EXT}
        error_validate
    else
        MESSAGE="No local ${PH_CUSTOM_DNS} detected"
        echo_warn
    fi
}

function backup_local_cname {
    if [ -f ${LOCAL_DNSMASQ_DIRECTORY}/${PH_CNAME_CONF} ]; then
        MESSAGE="${UI_BACKUP_LOCAL} ${UI_CNAME_NAME}"
        echo_stat
        
        sudo cp ${LOCAL_DNSMASQ_DIRECTORY}/${PH_CNAME_CONF} ${LOCAL_PIHOLE_DIRECTORY}/${PH_CNAME_CONF}.${GS_BACKUP_EXT}
        error_validate
    else
        MESSAGE="No local ${PH_CNAME_CONF} detected"
        echo_warn
    fi
}

function backup_remote_gravity {
    MESSAGE="${UI_BACKUP_REMOTE} ${UI_GRAVITY_NAME}"
    echo_stat

    if [ "$REMOTE_PIHOLE_TYPE" == "default" ]; then
        CMD_TIMEOUT=$GS_BACKUP_TIMEOUT
        CMD_REQUESTED="sudo ${RFTL_EXEC} sql ${REMOTE_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI} \".backup '${REMOTE_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI}.${GS_BACKUP_EXT}'\""
        create_ssh_cmd
    elif [ "$REMOTE_PIHOLE_TYPE" == "docker" ]; then
        CMD_TIMEOUT=$GS_BACKUP_TIMEOUT
        CMD_REQUESTED="sudo ${RFTL_EXEC} sql ${DEFAULT_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI} \".backup '${DEFAULT_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI}.${GS_BACKUP_EXT}'\""
        create_ssh_cmd
    elif [ "$REMOTE_PIHOLE_TYPE" == "podman" ]; then
        CMD_TIMEOUT=$GS_BACKUP_TIMEOUT
        CMD_REQUESTED="sudo ${RFTL_EXEC} sql ${DEFAULT_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI} \".backup '${DEFAULT_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI}.${GS_BACKUP_EXT}'\""
        create_ssh_cmd
    fi
}

function backup_remote_gravity_integrity {
    MESSAGE="${UI_BACKUP_INTEGRITY}"
    echo_stat
    
    sleep $GS_BACKUP_INTEGRITY_WAIT

    if [ "$REMOTE_PIHOLE_TYPE" == "default" ]; then
        REMOTE_INTEGRITY_CHECK=$(${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} "${RFTL_EXEC} sql ${REMOTE_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI}.${GS_BACKUP_EXT} 'PRAGMA integrity_check;'" | sed 's/\s.*$//')
        error_validate
    elif [ "$REMOTE_PIHOLE_TYPE" == "docker" ]; then
        REMOTE_INTEGRITY_CHECK=$(${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} "${RFTL_EXEC} sql ${DEFAULT_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI}.${GS_BACKUP_EXT} 'PRAGMA integrity_check;'" | sed 's/\s.*$//')
        error_validate
    elif [ "$REMOTE_PIHOLE_TYPE" == "podman" ]; then
        REMOTE_INTEGRITY_CHECK=$(${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} "${RFTL_EXEC} sql ${DEFAULT_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI}.${GS_BACKUP_EXT} 'PRAGMA integrity_check;'" | sed 's/\s.*$//')
        error_validate
    fi
    
    if [ "$REMOTE_INTEGRITY_CHECK" != 'ok' ]; then
        MESSAGE="${UI_BACKUP_INTEGRITY_FAILED} ${UI_GRAVITY_NAME}"
        echo_fail
        
        MESSAGE="${UI_BACKUP_INTEGRITY_DELETE} ${UI_GRAVITY_NAME}"
        echo_stat
        
        CMD_TIMEOUT=$GS_BACKUP_TIMEOUT
        CMD_REQUESTED="sudo rm ${REMOTE_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI}.${GS_BACKUP_EXT}"
        create_ssh_cmd
        
        exit_no_change
    fi
}

function backup_remote_custom {
        MESSAGE="${UI_BACKUP_REMOTE} ${UI_CUSTOM_NAME}"
        echo_stat
        
        CMD_TIMEOUT=$GS_BACKUP_TIMEOUT
        CMD_REQUESTED="sudo cp ${REMOTE_PIHOLE_DIRECTORY}/${PH_CUSTOM_DNS} ${REMOTE_PIHOLE_DIRECTORY}/${PH_CUSTOM_DNS}.${GS_BACKUP_EXT}"
        create_ssh_cmd
}

function backup_remote_cname {
        MESSAGE="${UI_BACKUP_REMOTE} ${UI_CNAME_NAME}"
        echo_stat
        
        CMD_TIMEOUT=$GS_BACKUP_TIMEOUT
        CMD_REQUESTED="sudo cp ${REMOTE_DNSMASQ_DIRECTORY}/${PH_CNAME_CONF} ${REMOTE_PIHOLE_DIRECTORY}/${PH_CNAME_CONF}.${GS_BACKUP_EXT}"
        create_ssh_cmd
}

function backup_cleanup {
    MESSAGE="Purging backups"
    echo_stat
    # git clean -fq
    sudo rm -f ${LOCAL_PIHOLE_DIRECTORY}/*.${GS_BACKUP_EXT}
    error_validate

    # MESSAGE="${UI_BACKUP_PURGE} on remote"
    # echo_stat
    # CMD_TIMEOUT=$GS_BACKUP_TIMEOUT
    # CMD_REQUESTED="sudo rm -f ${REMOTE_PIHOLE_DIRECTORY}/*.${GS_BACKUP_EXT}"
    # create_ssh_cmd
}

function md5_compare {
    GS_HASH_MARK='0'
    
    MESSAGE="${UI_HASHING_HASHING} ${UI_GRAVITY_NAME}"
    echo_stat
    REMOTE_DB_MD5=$(${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} "md5sum ${REMOTE_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI}" | sed 's/\s.*$//')
    error_validate
    
    MESSAGE="${UI_HASHING_COMPARING} ${UI_GRAVITY_NAME}"
    echo_stat
    LOCAL_DB_MD5=$(md5sum ${LOCAL_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI} | sed 's/\s.*$//')
    error_validate
    
    if [ "$REMOTE_DB_MD5" == "$LAST_REMOTE_DB_MD5" ] && [ "$LOCAL_DB_MD5" == "$LAST_LOCAL_DB_MD5" ]; then
        GS_HASH_MARK=$((GS_HASH_MARK+0))
    else
        MESSAGE="${UI_HASHING_DIFFERENCE} ${UI_GRAVITY_NAME}"
        echo_warn
        GS_HASH_MARK=$((GS_HASH_MARK+1))
    fi
    
    if [ -f ${LOCAL_PIHOLE_DIRECTORY}/${PH_CUSTOM_DNS} ]; then
        if ${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} test -e ${REMOTE_PIHOLE_DIRECTORY}/${PH_CUSTOM_DNS}; then
            REMOTE_PH_CUSTOM_DNS="1"
            MESSAGE="${UI_HASHING_HASHING} ${UI_CUSTOM_NAME}"
            echo_stat
            
            REMOTE_CL_MD5=$(${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} "md5sum ${REMOTE_PIHOLE_DIRECTORY}/${PH_CUSTOM_DNS} | sed 's/\s.*$//'")
            error_validate
            
            MESSAGE="${UI_HASHING_COMPARING} ${UI_CUSTOM_NAME}"
            echo_stat
            LOCAL_CL_MD5=$(md5sum ${LOCAL_PIHOLE_DIRECTORY}/${PH_CUSTOM_DNS} | sed 's/\s.*$//')
            error_validate
            
            if [ "$REMOTE_CL_MD5" == "$LAST_REMOTE_CL_MD5" ] && [ "$LOCAL_CL_MD5" == "$LAST_LOCAL_CL_MD5" ]; then
                GS_HASH_MARK=$((GS_HASH_MARK+0))
            else
                MESSAGE="${UI_HASHING_DIFFERENCE} ${UI_CUSTOM_NAME}"
                echo_warn
                GS_HASH_MARK=$((GS_HASH_MARK+1))
            fi
        else
            MESSAGE="${UI_CUSTOM_NAME} ${UI_HASHING_NOT_DETECTED} ${UI_HASHING_REMOTE}"
            echo_warn
        fi
    else
        if ${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} test -e ${REMOTE_PIHOLE_DIRECTORY}/${PH_CUSTOM_DNS}; then
            REMOTE_PH_CUSTOM_DNS="1"
            MESSAGE="${UI_CUSTOM_NAME} ${UI_HASHING_DETECTED} ${UI_HASHING_REMOTE}"
            GS_HASH_MARK=$((GS_HASH_MARK+1))
            echo_warn
        fi
        MESSAGE="${UI_CUSTOM_NAME} ${UI_HASHING_NOT_DETECTED} ${UI_HASHING_LOCAL}"
        echo_warn
    fi

    if [ -f ${LOCAL_DNSMASQ_DIRECTORY}/${PH_CNAME_CONF} ]; then
        if ${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} test -e ${REMOTE_DNSMASQ_DIRECTORY}/${PH_CNAME_CONF}; then
            REMOTE_CNAME_DNS="1"
            MESSAGE="${UI_HASHING_HASHING} ${UI_CNAME_NAME}"
            echo_stat
            
            REMOTE_CN_MD5=$(${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} "md5sum ${REMOTE_DNSMASQ_DIRECTORY}/${PH_CNAME_CONF} | sed 's/\s.*$//'")
            error_validate
            
            MESSAGE="${UI_HASHING_COMPARING} ${UI_CNAME_NAME}"
            echo_stat
            LOCAL_CN_MD5=$(md5sum ${LOCAL_DNSMASQ_DIRECTORY}/${PH_CNAME_CONF} | sed 's/\s.*$//')
            error_validate
            
            if [ "$REMOTE_CN_MD5" == "$LAST_REMOTE_CN_MD5" ] && [ "$LOCAL_CN_MD5" == "$LAST_LOCAL_CN_MD5" ]; then
                GS_HASH_MARK=$((GS_HASH_MARK+0))
            else
                MESSAGE="${UI_HASHING_DIFFERENCE} ${UI_CNAME_NAME}"
                echo_warn
                GS_HASH_MARK=$((GS_HASH_MARK+1))
            fi
        else
            MESSAGE="${UI_CNAME_NAME} ${UI_HASHING_NOT_DETECTED} ${UI_HASHING_REMOTE}"
            echo_warn
        fi
    else
        if ${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} test -e ${REMOTE_DNSMASQ_DIRECTORY}/${PH_CNAME_CONF}; then
            REMOTE_CNAME_DNS="1"
            MESSAGE="${UI_CNAME_NAME} ${UI_HASHING_DETECTED} ${UI_HASHING_REMOTE}"
            GS_HASH_MARK=$((GS_HASH_MARK+1))
            echo_warn
        fi
        
        MESSAGE="${UI_CNAME_NAME} ${UI_HASHING_NOT_DETECTED} ${UI_HASHING_LOCAL}"
        echo_warn
    fi
    
    if [ "$GS_HASH_MARK" != "0" ]; then
        MESSAGE="Replication of ${UI_CORE_APP} settings is required"
        echo_warn
        GS_HASH_MARK=$((GS_HASH_MARK+0))
    else
        MESSAGE="No replication is required at this time"
        echo_warn
        exit_no_change
    fi
}

function previous_md5 {
    if [ -f "${GS_ETC_PATH}/${GS_GRAVITY_FI_MD5_LOG}" ]; then
        LAST_REMOTE_DB_MD5=$(sed "1q;d" ${GS_ETC_PATH}/${GS_GRAVITY_FI_MD5_LOG})
        LAST_LOCAL_DB_MD5=$(sed "2q;d" ${GS_ETC_PATH}/${GS_GRAVITY_FI_MD5_LOG})
    else
        LAST_REMOTE_DB_MD5="0"
        LAST_LOCAL_DB_MD5="0"
    fi

    if [ -f "${GS_ETC_PATH}/${GS_CUSTOM_DNS_MD5_LOG}" ]; then
        LAST_REMOTE_CL_MD5=$(sed "1q;d" ${GS_ETC_PATH}/${GS_CUSTOM_DNS_MD5_LOG})
        LAST_LOCAL_CL_MD5=$(sed "2q;d" ${GS_ETC_PATH}/${GS_CUSTOM_DNS_MD5_LOG})
    else
        LAST_REMOTE_CL_MD5="0"
        LAST_LOCAL_CL_MD5="0"
    fi

    if [ -f "${GS_ETC_PATH}/${GS_CNAME_CONF_MD5_LOG}" ]; then
        LAST_REMOTE_CN_MD5=$(sed "1q;d" ${GS_ETC_PATH}/${GS_CNAME_CONF_MD5_LOG})
        LAST_LOCAL_CN_MD5=$(sed "2q;d" ${GS_ETC_PATH}/${GS_CNAME_CONF_MD5_LOG})
    else
        LAST_REMOTE_CN_MD5="0"
        LAST_LOCAL_CN_MD5="0"
    fi
}

function md5_recheck {
    MESSAGE="Performing replicator diagnostics"
    echo_prompt
    
    GS_HASH_MARK='0'
    
    MESSAGE="${UI_HASHING_REHASHING} ${UI_GRAVITY_NAME}"
    echo_stat
    REMOTE_DB_MD5=$(${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} "md5sum ${REMOTE_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI}" | sed 's/\s.*$//')
    error_validate
    
    MESSAGE="${UI_HASHING_RECOMPARING} ${UI_GRAVITY_NAME}"
    echo_stat
    LOCAL_DB_MD5=$(md5sum ${LOCAL_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI} | sed 's/\s.*$//')
    error_validate
    
    if [ -f ${LOCAL_PIHOLE_DIRECTORY}/${PH_CUSTOM_DNS} ]; then
        if ${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} test -e ${REMOTE_PIHOLE_DIRECTORY}/${PH_CUSTOM_DNS}; then
            REMOTE_PH_CUSTOM_DNS="1"
            MESSAGE="${UI_HASHING_REHASHING} ${UI_CUSTOM_NAME}"
            echo_stat
            
            REMOTE_CL_MD5=$(${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} "md5sum ${REMOTE_PIHOLE_DIRECTORY}/${PH_CUSTOM_DNS} | sed 's/\s.*$//'")
            error_validate
            
            MESSAGE="${UI_HASHING_RECOMPARING} ${UI_CUSTOM_NAME}"
            echo_stat
            LOCAL_CL_MD5=$(md5sum ${LOCAL_PIHOLE_DIRECTORY}/${PH_CUSTOM_DNS} | sed 's/\s.*$//')
            error_validate
        else
            MESSAGE="${UI_CUSTOM_NAME} ${UI_HASHING_NOT_DETECTED} ${UI_HASHING_REMOTE}"
            echo_warn
        fi
    else
        if ${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} test -e ${REMOTE_PIHOLE_DIRECTORY}/${PH_CUSTOM_DNS}; then
            REMOTE_PH_CUSTOM_DNS="1"
            MESSAGE="${UI_CUSTOM_NAME} ${UI_HASHING_DETECTED} ${UI_HASHING_REMOTE}"
            echo_warn
        fi
        MESSAGE="${UI_CUSTOM_NAME} ${UI_HASHING_NOT_DETECTED} ${UI_HASHING_LOCAL}"
        echo_warn
    fi
    
    if [ -f ${LOCAL_DNSMASQ_DIRECTORY}/${PH_CNAME_CONF} ]; then
        if ${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} test -e ${REMOTE_DNSMASQ_DIRECTORY}/${PH_CNAME_CONF}; then
            REMOTE_CNAME_DNS="1"
            MESSAGE="${UI_HASHING_REHASHING} ${UI_CNAME_NAME}"
            echo_stat
            
            REMOTE_CN_MD5=$(${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} "md5sum ${REMOTE_DNSMASQ_DIRECTORY}/${PH_CNAME_CONF} | sed 's/\s.*$//'")
            error_validate
            
            MESSAGE="${UI_HASHING_RECOMPARING} ${UI_CNAME_NAME}"
            echo_stat
            LOCAL_CN_MD5=$(md5sum ${LOCAL_DNSMASQ_DIRECTORY}/${PH_CNAME_CONF} | sed 's/\s.*$//')
            error_validate
        else
            MESSAGE="${UI_CNAME_NAME} ${UI_HASHING_NOT_DETECTED} ${UI_HASHING_REMOTE}"
            echo_warn
        fi
    else
        if ${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} test -e ${REMOTE_DNSMASQ_DIRECTORY}/${PH_CNAME_CONF}; then
            REMOTE_CNAME_DNS="1"
            MESSAGE="${UI_CNAME_NAME} ${UI_HASHING_NOT_DETECTED} ${UI_HASHING_REMOTE}"
            echo_warn
        fi
        
        MESSAGE="${UI_CNAME_NAME} ${UI_HASHING_NOT_DETECTED} ${UI_HASHING_LOCAL}"
        echo_warn
    fi
}

## Determine SSH Pathways
function create_ssh_cmd {
    timeout --preserve-status ${CMD_TIMEOUT} ${OS_SSH_CMD} -p ${GS_SSH_PORT} -i ${GS_SSH_PKIF} -o StrictHostKeyChecking=no ${REMOTE_USER}@${REMOTE_HOST} "${CMD_REQUESTED}"
    error_validate
}

## Determine SSH Pathways
function create_rsync_cmd {
    rsync --rsync-path="${RSYNC_REPATH}" -e "${OS_SSH_CMD} -p ${GS_SSH_PORT} -i ${GS_SSH_PKIF}" ${RSYNC_SOURCE} ${RSYNC_TARGET} >/dev/null 2>&1
    error_validate
}

function generate_ssh_key {
    if [ -z $INPUT_REMOTE_PASS ]; then
        if [ -f ${GS_SSH_PKIF} ]; then
            MESSAGE="Using existing SSH key"
            echo_good_clean
        else
            if hash ssh-keygen >/dev/null 2>&1; then
                MESSAGE="Generating new SSH key"
                echo_stat
                
                ssh-keygen -q -P "" -t rsa -f ${OS_TMP}/gravity-sync.rsa >/dev/null 2>&1
                error_validate

                MESSAGE="Moving private key to ${GS_SSH_PKIF}"
                sudo mv ${OS_TMP}/gravity-sync.rsa ${GS_SSH_PKIF}
                error_validate

                MESSAGE="Moving public key to ${GS_SSH_PKIF}.pub"
                sudo mv ${OS_TMP}/gravity-sync.rsa.pub ${GS_SSH_PKIF}.pub
                error_validate
            else
                MESSAGE="No SSH-KEYGEN available"
                echo_warn
                exit_no_change
            fi
        fi
    fi
}

function export_ssh_key {
    if [ -z $REMOTE_PASS ]; then
        if [ -f ${GS_SSH_PKIF} ]; then
            MESSAGE="Registering SSH key to ${REMOTE_HOST}"
            echo_prompt
            
            ssh-copy-id -f -p ${GS_SSH_PORT} -i ${GS_SSH_PKIF}.pub ${REMOTE_USER}@${REMOTE_HOST}
        else
            MESSAGE="Error registering SSH key to ${REMOTE_HOST}"
            echo_warn
        fi
    fi
}

function show_target {
    MESSAGE="Remote ${UI_CORE_APP}: ${REMOTE_USER}@${REMOTE_HOST}"
    echo_info
}

## Logs Task
function task_logs {
    GS_TASK_TYPE='LOGS'
    MESSAGE="${MESSAGE}: ${GS_TASK_TYPE}"
    echo_good
    logs_gs
}

## Core Logging
### Write Logs Out
function logs_export {
    MESSAGE="Saving updated data hashes"
    echo_stat
    sudo rm -f ${GS_ETC_PATH}/*.md5
    echo -e ${REMOTE_DB_MD5} | sudo tee -a ${GS_ETC_PATH}/${GS_GRAVITY_FI_MD5_LOG} 1> /dev/null
    echo -e ${LOCAL_DB_MD5} | sudo tee -a ${GS_ETC_PATH}/${GS_GRAVITY_FI_MD5_LOG} 1> /dev/null
    echo -e ${REMOTE_CL_MD5} | sudo tee -a ${GS_ETC_PATH}/${GS_CUSTOM_DNS_MD5_LOG} 1> /dev/null
    echo -e ${LOCAL_CL_MD5} | sudo tee -a ${GS_ETC_PATH}/${GS_CUSTOM_DNS_MD5_LOG} 1> /dev/null
    echo -e ${REMOTE_CN_MD5} | sudo tee -a ${GS_ETC_PATH}/${GS_CNAME_CONF_MD5_LOG} 1> /dev/null
    echo -e ${LOCAL_CN_MD5} | sudo tee -a ${GS_ETC_PATH}/${GS_CNAME_CONF_MD5_LOG} 1> /dev/null
    
    if [ "${GS_PEERLESS_MODE}" != "1" ]; then
        sudo rm -f ${OS_TMP}/*.md5
        echo -e ${LOCAL_DB_MD5} | sudo tee -a ${OS_TMP}/${GS_GRAVITY_FI_MD5_LOG} 1> /dev/null
        echo -e ${REMOTE_DB_MD5} | sudo tee -a ${OS_TMP}/${GS_GRAVITY_FI_MD5_LOG} 1> /dev/null
        echo -e ${LOCAL_CL_MD5} | sudo tee -a ${OS_TMP}/${GS_CUSTOM_DNS_MD5_LOG} 1> /dev/null
        echo -e ${REMOTE_CL_MD5} | sudo tee -a ${OS_TMP}/${GS_CUSTOM_DNS_MD5_LOG} 1> /dev/null
        echo -e ${LOCAL_CN_MD5} | sudo tee -a ${OS_TMP}/${GS_CNAME_CONF_MD5_LOG} 1> /dev/null
        echo -e ${REMOTE_CN_MD5} | sudo tee -a ${OS_TMP}/${GS_CNAME_CONF_MD5_LOG} 1> /dev/null
        error_validate

        MESSAGE="Sending hashes to ${PROGRAM} peer"
        echo_stat

        RSYNC_REPATH="sudo rsync"
        RSYNC_SOURCE="${OS_TMP}/*.md5"
        RSYNC_TARGET="${REMOTE_USER}@${REMOTE_HOST}:${GS_ETC_PATH}/"
        create_rsync_cmd

        MESSAGE="Setting permissions on remote hashing files"
        echo_stat
        CMD_TIMEOUT=$GS_BACKUP_TIMEOUT
        CMD_REQUESTED="sudo chmod 644 ${GS_ETC_PATH}/*.md5"
        create_ssh_cmd

        sudo rm -f ${OS_TMP}/*.md5
    fi
    
    MESSAGE="Logging successful ${GS_TASK_TYPE}"
    echo_stat
    echo -e "$(date) [${GS_TASK_TYPE}]" | sudo tee -a ${GS_ETC_PATH}/${GS_SYNCING_LOG} 1> /dev/null
    error_validate
}

### Output Sync Logs
function logs_gs {
    MESSAGE="Displaying output of previous jobs"
    echo_info
    
    echo -e "${UI_LOGGING_RECENT_COMPLETE} ${YELLOW}SMART${NC}"
    tail -n 7 "${GS_ETC_PATH}/${GS_SYNCING_LOG}" | grep SMART
    echo -e "${UI_LOGGING_RECENT_COMPLETE} ${YELLOW}PULL${NC}"
    tail -n 7 "${GS_ETC_PATH}/${GS_SYNCING_LOG}" | grep PULL
    echo -e "${UI_LOGGING_RECENT_COMPLETE} ${YELLOW}PUSH${NC}"
    tail -n 7 "${GS_ETC_PATH}/${GS_SYNCING_LOG}" | grep PUSH
    
    exit_no_change
}

## Validate Pi-hole Folders
function validate_ph_folders {
    MESSAGE="${UI_VALIDATING} ${UI_CORE_APP}"
    echo_stat
    
    if [ "$LOCAL_PIHOLE_TYPE" == "default" ]; then
        if [ ! -f ${LOCAL_PIHOLE_BINARY} ]; then
            MESSAGE="${UI_VALIDATING_FAIL_BINARY} ${UI_CORE_APP}"
            echo_fail
            exit_no_change
        fi
    elif [ "$LOCAL_PIHOLE_TYPE" == "docker" ]; then
        PH_FTL_CHECK=$(sudo docker container ls | grep "${PIHOLE_CONTAINER_IMAGE}")
        if [ "$PH_FTL_CHECK" == "" ]; then
            MESSAGE="${UI_VALIDATING_FAIL_CONTAINER} ${UI_CORE_APP}"
            echo_fail
            exit_no_change
        fi
    elif [ "$LOCAL_PIHOLE_TYPE" == "podman" ]; then
        PH_FTL_CHECK=$(sudo podman container ls | grep "${PIHOLE_CONTAINER_IMAGE}")
        if [ "$PH_FTL_CHECK" == "" ]; then
            MESSAGE="${UI_VALIDATING_FAIL_CONTAINER} ${UI_CORE_APP}"
            echo_fail
            exit_no_change
        fi
    fi
    
    if [ ! -d ${LOCAL_PIHOLE_DIRECTORY} ]; then
        MESSAGE="${UI_VALIDATING_FAIL_FOLDER} ${UI_CORE_APP}"
        echo_fail
        exit_no_change
    fi
    
    echo_good
}

function detect_local_pihole {
    MESSAGE="Detecting local ${UI_CORE_APP} installation"
    echo_stat
    
    if hash pihole 2>/dev/null; then
        LOCAL_PIHOLE_TYPE="default"
        echo_good
    elif hash docker 2>/dev/null; then
        PH_FTL_CHECK=$(sudo docker container ls | grep 'pihole/pihole')
        if [ "$PH_FTL_CHECK" != "" ]; then
            LOCAL_PIHOLE_TYPE="docker"
            echo_good
        else
            LOCAL_PIHOLE_TYPE="none"
            echo_fail
        fi
    elif hash podman 2>/dev/null; then
        PH_FTL_CHECK=$(sudo podman container ls | grep 'pihole/pihole')
        if [ "$PH_FTL_CHECK" != "" ]; then
            LOCAL_PIHOLE_TYPE="podman"
            echo_good
        else
            LOCAL_PIHOLE_TYPE="none"
            echo_fail
        fi
    else   
        LOCAL_PIHOLE_TYPE="none"
        echo_fail
    fi
}

function detect_remote_pihole {
    MESSAGE="Detecting remote ${UI_CORE_APP} installation"
    echo_stat
    
    if ${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} test -e ${REMOTE_PIHOLE_BINARY}; then
        REMOTE_PIHOLE_TYPE="default"
        echo_good
    else   
        REMOTE_DETECT_DOCKER=$(${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} "sudo docker container ls | grep 'pihole/pihole'" 2>/dev/null)
        REMOTE_DETECT_PODMAN=$(${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} "sudo podman container ls | grep 'pihole/pihole'" 2>/dev/null)

        if [ "${REMOTE_DETECT_DOCKER}" != "" ]; then
            REMOTE_PIHOLE_TYPE="docker"
            echo_good
        elif [ "${REMOTE_DETECT_PODMAN}" != "" ]; then
            REMOTE_PIHOLE_TYPE="podman"
            echo_good
        else
            REMOTE_PIHOLE_TYPE="none"
            echo_fail
        fi
    fi
}

function detect_gs_peer {
    MESSAGE="Checking on peer"
    echo_stat

    if ${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} test -e ${GS_ETC_PATH}/${GS_CONFIG_FILE}; then
        MESSAGE="${PROGRAM} remote peer is configured"
        echo_good
    else
        GS_PEERLESS_MODE="1"
        MESSAGE="${PROGRAM} falling back to peerless mode"
        echo_good

        MESSAGE="Please configure ${PROGRAM} on remote host"
        echo_warn
    fi
}

## Validate DNSMASQ Folders
function validate_dns_folders {
    MESSAGE="${UI_VALIDATING} ${UI_CORE_APP_DNS}"
    echo_stat
    
    if [ ! -d ${LOCAL_DNSMASQ_DIRECTORY} ]; then
        MESSAGE="${UI_VALIDATING_FAIL_FOLDER} ${UI_CORE_APP_DNS}"
        echo_fail
        exit_no_change
    fi
    echo_good
}

## Validate Domain Database Permissions
function validate_gravity_permissions {
    MESSAGE="${UI_SET_LOCAL_FILE_OWNERSHIP} ${UI_GRAVITY_NAME}"
    echo_stat
    sudo chown ${LOCAL_FILE_OWNER} ${LOCAL_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI} >/dev/null 2>&1
    error_validate
        
    MESSAGE="${UI_SET_FILE_PERMISSION} ${UI_GRAVITY_NAME}"
    echo_stat
    sudo chmod 664 ${LOCAL_PIHOLE_DIRECTORY}/${PH_GRAVITY_FI} >/dev/null 2>&1
    error_validate
}

## Validate Local DNS Records Permissions
function validate_custom_permissions {
    MESSAGE="${UI_SET_LOCAL_FILE_OWNERSHIP} ${UI_CUSTOM_NAME}"
    echo_stat
    sudo chown root:root ${LOCAL_PIHOLE_DIRECTORY}/${PH_CUSTOM_DNS} >/dev/null 2>&1
    error_validate
    
    MESSAGE="${UI_SET_FILE_PERMISSION} ${UI_CUSTOM_NAME}"
    echo_stat
    sudo chmod 644 ${LOCAL_PIHOLE_DIRECTORY}/${PH_CUSTOM_DNS} >/dev/null 2>&1
    error_validate
}

## Validate Local DNS CNAME Permissions
function validate_cname_permissions {
    MESSAGE="${UI_SET_LOCAL_FILE_OWNERSHIP} ${UI_CNAME_NAME}"
    echo_stat
    sudo chown root:root ${LOCAL_DNSMASQ_DIRECTORY}/${PH_CNAME_CONF} >/dev/null 2>&1
    error_validate
    
    MESSAGE="${UI_SET_FILE_PERMISSION} ${UI_CNAME_NAME}"
    echo_stat
    sudo chmod 644 ${LOCAL_DNSMASQ_DIRECTORY}/${PH_CNAME_CONF} >/dev/null 2>&1
    error_validate
}

## Validate Intent
function intent_validate {
    PHASER=$((( RANDOM % 4 ) + 1 ))
    if [ "$PHASER" = "1" ]; then
        INTENT="FIRE PHOTON TORPEDOES"
    elif [ "$PHASER" = "2" ]; then
        INTENT="FIRE ALL PHASERS"
    elif [ "$PHASER" = "3" ]; then
        INTENT="EJECT THE WARP CORE"
    elif [ "$PHASER" = "4" ]; then
        INTENT="ENGAGE TRACTOR BEAM"
    fi
    
    MESSAGE="Type ${INTENT} to confirm"
    echo_need
    
    read -r INPUT_INTENT
    
    if [ "${INPUT_INTENT}" != "${INTENT}" ]; then
        MESSAGE="${GS_TASK_TYPE} excited"
        echo_info
        exit_no_change
    fi
}

## Sudo Creation Task
function task_sudo {
    GS_TASK_TYPE='SUDO'
    MESSAGE="${MESSAGE}: ${GS_TASK_TYPE}"
    echo_good
    
    MESSAGE="Creating sudoers.d template file"
    echo_stat
    
    NEW_SUDO_USER=$(whoami)
    echo -e "${NEW_SUDO_USER} ALL=(ALL) NOPASSWD: ALL" | sudo tee ${GS_LOCAL_REPO}/templates/gs-nopasswd.sudo 1> /dev/null
    error_validate
    
    MESSAGE="Installing sudoers.d file on $HOSTNAME"
    echo_stat
    
    sudo install -m 0440 ${GS_LOCAL_REPO}/templates/gs-nopasswd.sudo /etc/sudoers.d/gs-nopasswd
    error_validate
    
    exit_with_changes
}

function validate_sudo_status {
    OS_CURRENT_USER=$(whoami)
    if [ ! "$EUID" -ne 0 ]; then
        OS_LOCAL_ADMIN=""
    else
        OS_SUDO_CHECK=$(groups ${OS_CURRENT_USER} | grep -e 'sudo' -e 'wheel')
        if [ "$OS_SUDO_CHECK" == "" ]; then
            OS_LOCAL_ADMIN="nosudo"
        else
            OS_LOCAL_ADMIN="sudo"
        fi
    fi
    
    if [ "$OS_LOCAL_ADMIN" == "nosudo" ]; then
        GS_TASK_TYPE='ROOT'
        MESSAGE="${MESSAGE} ${GS_TASK_TYPE}"
        echo_fail
        
        MESSAGE="${OS_CURRENT_USER} has insufficient user rights for ${PROGRAM}"
        echo_warn
        
        exit_no_change
    fi
}

## Configure Task
function task_configure {				
    GS_TASK_TYPE='CONFIGURE'
    MESSAGE="${MESSAGE}: ${GS_TASK_TYPE}"
    echo_good
    
    if [ -f ${GS_ETC_PATH}/${GS_CONFIG_FILE} ]; then		
        config_delete
    else
        config_generate
    fi
    
    exit_with_changes
}

## Generate New Configuration
function config_generate {  
    MESSAGE="Creating new ${GS_CONFIG_FILE}"
    echo_stat
    sudo cp ${GS_LOCAL_REPO}/templates/${GS_CONFIG_FILE}.example ${GS_ETC_PATH}/${GS_CONFIG_FILE}
    error_validate
    
    echo_blank
    echo -e "  Welcome to the ${PURPLE}${PROGRAM}${NC} Configuration Wizard"
    echo -e "  Please read through ${BLUE}https://github.com/vmstan/gravity-sync/wiki${NC} before you continue"
    echo -e "  Make sure that ${UI_CORE_APP} is running on this system before your configure ${PROGRAM}"
    echo_blank
    
    MESSAGE="${PROGRAM} Remote Host Settings"
    echo_info

    MESSAGE="Remote ${UI_CORE_APP} host address"
    echo_prompt

    MESSAGE="IP"
    echo_need
    read -r INPUT_REMOTE_HOST

    MESSAGE="${UI_CONFIG_SAVING} ${INPUT_REMOTE_HOST} host to ${GS_CONFIG_FILE}"
    echo_stat
    sudo sed -i "/REMOTE_HOST=''/c\REMOTE_HOST='${INPUT_REMOTE_HOST}'" ${GS_ETC_PATH}/${GS_CONFIG_FILE}
    error_validate
    
    MESSAGE="Remote ${UI_CORE_APP} host username"
    echo_prompt

    MESSAGE="User"
    echo_need
    read -r INPUT_REMOTE_USER
    
    MESSAGE="${UI_CONFIG_SAVING} ${INPUT_REMOTE_USER}@${INPUT_REMOTE_HOST} to ${GS_CONFIG_FILE}"
    echo_stat
    sudo sed -i "/REMOTE_USER=''/c\REMOTE_USER='${INPUT_REMOTE_USER}'" ${GS_ETC_PATH}/${GS_CONFIG_FILE}
    error_validate

    MESSAGE="${PROGRAM} SSH Key Settings"
    echo_info

    generate_ssh_key
    
    MESSAGE="${UI_CORE_LOADING} ${GS_CONFIG_FILE}"
    echo_stat
    # shellcheck source=/etc/gravity-sync/gravity-sync.conf
    source ${GS_ETC_PATH}/${GS_CONFIG_FILE}
    error_validate

    export_ssh_key

    MESSAGE="SSH key registered to ${INPUT_REMOTE_HOST}"
    echo_good_clean

    MESSAGE="${UI_CORE_APP} Installation Settings"
    echo_info

    detect_local_pihole
    if [ "${LOCAL_PIHOLE_TYPE}" == "default" ]; then
        MESSAGE="Default install of ${UI_CORE_APP} detected"
        echo_good_clean
    elif [ "${LOCAL_PIHOLE_TYPE}" == "docker" ]; then
        MESSAGE="Docker container ${UI_CORE_APP} install detected"
        echo_good_clean
    elif [ "${LOCAL_PIHOLE_TYPE}" == "podman" ]; then
        MESSAGE="Podman container ${UI_CORE_APP} install detected"
        echo_good_clean
    elif [ "${LOCAL_PIHOLE_TYPE}" == "none" ]; then
        MESSAGE="No local ${UI_CORE_APP} installed detected"
        echo_warn
        end_config_no_pi
    fi

    detect_remote_pihole
    if [ "${REMOTE_PIHOLE_TYPE}" == "default" ]; then
        MESSAGE="Remote install of ${UI_CORE_APP} detected"
        echo_good_clean
    elif [ "${REMOTE_PIHOLE_TYPE}" == "docker" ]; then
        MESSAGE="Remote Docker container of ${UI_CORE_APP} detected"
        echo_good_clean
    elif [ "${REMOTE_PIHOLE_TYPE}" == "podman" ]; then
        MESSAGE="Remote Podman container of ${UI_CORE_APP} detected"
        echo_good_clean
    elif [ "${LOCAL_PIHOLE_TYPE}" == "none" ]; then
        MESSAGE="No remote ${UI_CORE_APP} installed detected"
        echo_warn
        end_config_no_pi
    fi

    if [ "${LOCAL_PIHOLE_TYPE}" == "default" ] && [ "${REMOTE_PIHOLE_TYPE}" == "default" ]; then
        end_config
    else
        advanced_config_generate
    fi
}

function end_config {
    echo_blank
    echo -e "  Configuration has been completed successfully, once ${PROGRAM} has been installed your other"
    echo -e "  node, your next step is to push all of the of data from the currently authoritative"
    echo -e "  ${UI_CORE_APP} instance to the other."
    echo -e "  ex: ${YELLOW}gravity-sync push${NC}" 
    echo_blank
    echo -e "  If that completes successfully you can automate future sync jobs to run at a regular interval on"
    echo -e "  both of your ${PROGRAM} peers."
    echo -e "  ex: ${YELLOW}gravity-sync auto${NC}"
    echo_blank
}

function end_config_no_pi {
    echo_blank
    echo -e "  Configuration could not be completed successfully, as no instances of ${UI_CORE_APP} could be detected"
    echo -e "  on one or more of your systems. Please make sure they are running on both peers and try again."
    echo_blank
}

## Advanced Configuration Options
function advanced_config_generate {  
    if [ "${LOCAL_PIHOLE_TYPE}" == "docker" ] || [ "${LOCAL_PIHOLE_TYPE}" == "podman" ]; then
        MESSAGE="Local Container Image Configuration"
        echo_info

        MESSAGE="Displaying running containers on $HOSTNAME"
        echo_good_clean

        if [ "${LOCAL_PIHOLE_TYPE}" == "docker" ]; then
            sudo docker ps -a --format 'table {{.ID}}\t{{.Names}}'
        elif [ "${LOCAL_PIHOLE_TYPE}" == "podman" ]; then
            sudo podman container ls
        fi
        
        MESSAGE="Enter local ${UI_CORE_APP} container name"
        echo_prompt
        MESSAGE="ex, 'pihole'"
        echo_need
        read -r INPUT_LOCAL_DOCKER_CONTAINER

        MESSAGE="${UI_CONFIG_SAVING} ${UI_CONFIG_LOCAL} ${UI_CONFIG_CONTAINER_NAME} to ${GS_CONFIG_FILE}"
        echo_stat
        sudo sed -i "/# LOCAL_DOCKER_CONTAINER=''/c\LOCAL_DOCKER_CONTAINER='${INPUT_LOCAL_DOCKER_CONTAINER}'" ${GS_ETC_PATH}/${GS_CONFIG_FILE}
        error_validate

        MESSAGE="Examining local container configuration"
        echo_stat

        if [ "${LOCAL_PIHOLE_TYPE}" == "docker" ]; then
            sudo docker container inspect ${INPUT_LOCAL_DOCKER_CONTAINER} | grep -i -B 1 '"Destination": "/etc/pihole"' > ${OS_TMP}/local_container_pihole_etc.log; sed -i '$d' ${OS_TMP}/local_container_pihole_etc.log; sed -i 's/"Source": "//' ${OS_TMP}/local_container_pihole_etc.log; sed -i 's/",//' ${OS_TMP}/local_container_pihole_etc.log; sed -i 's/ //g' ${OS_TMP}/local_container_pihole_etc.log
            sudo docker container inspect ${INPUT_LOCAL_DOCKER_CONTAINER} | grep -i -B 1 '"Destination": "/etc/dnsmasq.d"' > ${OS_TMP}/local_container_dnsmasq_etc.log; sed -i '$d' ${OS_TMP}/local_container_dnsmasq_etc.log; sed -i 's/"Source": "//' ${OS_TMP}/local_container_dnsmasq_etc.log; sed -i 's/",//' ${OS_TMP}/local_container_dnsmasq_etc.log; sed -i 's/ //g' ${OS_TMP}/local_container_dnsmasq_etc.log
        elif [ "${LOCAL_PIHOLE_TYPE}" == "podman" ]; then
            sudo podman container inspect ${INPUT_LOCAL_DOCKER_CONTAINER} | grep -i -B 1 '"Destination": "/etc/pihole"' > ${OS_TMP}/local_container_pihole_etc.log; sed -i '$d' ${OS_TMP}/local_container_pihole_etc.log; sed -i 's/"Source": "//' ${OS_TMP}/local_container_pihole_etc.log; sed -i 's/",//' ${OS_TMP}/local_container_pihole_etc.log; sed -i 's/ //g' ${OS_TMP}/local_container_pihole_etc.log
            sudo podman container inspect ${INPUT_LOCAL_DOCKER_CONTAINER} | grep -i -B 1 '"Destination": "/etc/dnsmasq.d"' > ${OS_TMP}/local_container_dnsmasq_etc.log; sed -i '$d' ${OS_TMP}/local_container_dnsmasq_etc.log; sed -i 's/"Source": "//' ${OS_TMP}/local_container_dnsmasq_etc.log; sed -i 's/",//' ${OS_TMP}/local_container_dnsmasq_etc.log; sed -i 's/ //g' ${OS_TMP}/local_container_dnsmasq_etc.log
        fi

        INPUT_LOCAL_PIHOLE_DIRECTORY=$(cat ${OS_TMP}/local_container_pihole_etc.log)
        INPUT_LOCAL_DNSMASQ_DIRECTORY=$(cat ${OS_TMP}/local_container_dnsmasq_etc.log)

        echo_good

        MESSAGE="${UI_CONFIG_SAVING} ${UI_CONFIG_LOCAL} ${UI_CORE_APP} ${UI_CONFIG_ETC_VOLUME_PATH} to ${GS_CONFIG_FILE}"
        echo_stat
        sudo sed -i "/# LOCAL_PIHOLE_DIRECTORY=''/c\LOCAL_PIHOLE_DIRECTORY='${INPUT_LOCAL_PIHOLE_DIRECTORY}'" ${GS_ETC_PATH}/${GS_CONFIG_FILE}
        error_validate

        MESSAGE="${UI_CONFIG_SAVING} ${UI_CONFIG_LOCAL} ${UI_CORE_APP_DNS} ${UI_CONFIG_ETC_VOLUME_PATH} to ${GS_CONFIG_FILE}"
        echo_stat
        sudo sed -i "/# LOCAL_DNSMASQ_DIRECTORY=''/c\LOCAL_DNSMASQ_DIRECTORY='${INPUT_LOCAL_DNSMASQ_DIRECTORY}'" ${GS_ETC_PATH}/${GS_CONFIG_FILE}
        error_validate
        
        MESSAGE="${UI_CONFIG_SAVING} ${UI_CONFIG_LOCAL} ${UI_CONFIG_VOLUME_OWNER} to ${GS_CONFIG_FILE}"
        echo_stat
        sudo sed -i "/# LOCAL_FILE_OWNER=''/c\LOCAL_FILE_OWNER='999:999'" ${GS_ETC_PATH}/${GS_CONFIG_FILE}
        error_validate
    fi
    
    if [ "${REMOTE_PIHOLE_TYPE}" == "docker" ] || [ "${REMOTE_PIHOLE_TYPE}" == "podman" ]; then        
        MESSAGE="Remote Container Image Configuration"
        echo_info

        MESSAGE="Querying running containers on ${REMOTE_HOST}"
        echo_stat
        if [ "${REMOTE_PIHOLE_TYPE}" == "docker" ]; then
            ${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} "sudo docker ps -a --format 'table {{.Image}}\t{{.Names}}' > /tmp/gs_local_container.log"
            error_validate
        elif [ "${REMOTE_PIHOLE_TYPE}" == "podman" ]; then
            ${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} "sudo podman container ls > /tmp/gs_local_container.log"
            error_validate
        fi
        
        MESSAGE="Retrieving container list from ${REMOTE_HOST}"
        RSYNC_REPATH="sudo rsync"
        RSYNC_SOURCE="${REMOTE_USER}@${REMOTE_HOST}:${OS_TMP}/gs_local_container.log"
        RSYNC_TARGET="${OS_TMP}/gs_remote_container.log"
        create_rsync_cmd

        MESSAGE="Displaying running containers on ${REMOTE_HOST}"
        echo_good_clean
        
        cat ${OS_TMP}/gs_remote_container.log

        MESSAGE="Enter remote ${UI_CORE_APP} container name"
        echo_prompt
        MESSAGE="ex, 'pihole'"
        echo_need
        read -r INPUT_REMOTE_DOCKER_CONTAINER
        
        MESSAGE="${UI_CONFIG_SAVING} remote host ${UI_CONFIG_CONTAINER_NAME} to ${GS_CONFIG_FILE}"
        echo_stat
        sudo sed -i "/# REMOTE_DOCKER_CONTAINER=''/c\REMOTE_DOCKER_CONTAINER='${INPUT_REMOTE_DOCKER_CONTAINER}'" ${GS_ETC_PATH}/${GS_CONFIG_FILE}
        error_validate

        MESSAGE="Examining remote container configuration"
        echo_stat

        if [ "${REMOTE_PIHOLE_TYPE}" == "docker" ]; then
            ${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} "sudo docker container inspect ${INPUT_REMOTE_DOCKER_CONTAINER} | grep -i -B 1 '\"Destination\": \"/etc/pihole\"' > ${OS_TMP}/local_container_pihole_etc.log"
            ${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} "sudo docker container inspect ${INPUT_REMOTE_DOCKER_CONTAINER} | grep -i -B 1 '\"Destination\": \"/etc/dnsmasq.d\"' > ${OS_TMP}/local_container_dnsmasq_etc.log"
            error_validate
        elif [ "${REMOTE_PIHOLE_TYPE}" == "podman" ]; then
            ${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} "sudo podman container inspect ${INPUT_REMOTE_DOCKER_CONTAINER} | grep -i -B 1 '\"Destination\": \"/etc/pihole\"' > ${OS_TMP}/local_container_pihole_etc.log"
            ${OS_SSH_CMD} -p ${GS_SSH_PORT} -i "${GS_SSH_PKIF}" ${REMOTE_USER}@${REMOTE_HOST} "sudo podman container inspect ${INPUT_REMOTE_DOCKER_CONTAINER} | grep -i -B 1 '\"Destination\": \"/etc/dnsmasq.d\"' > ${OS_TMP}/local_container_dnsmasq_etc.log"
            error_validate
        fi

        MESSAGE="Retrieving remote ${UI_CORE_APP} configuration settings"
        RSYNC_REPATH="sudo rsync"
        RSYNC_SOURCE="${REMOTE_USER}@${REMOTE_HOST}:${OS_TMP}/local_container_pihole_etc.log"
        RSYNC_TARGET="${OS_TMP}/remote_container_pihole_etc.log"
        create_rsync_cmd

        MESSAGE="Retrieving remote ${UI_CORE_APP_DNS} configuration settings"
        RSYNC_REPATH="sudo rsync"
        RSYNC_SOURCE="${REMOTE_USER}@${REMOTE_HOST}:${OS_TMP}/local_container_dnsmasq_etc.log"
        RSYNC_TARGET="${OS_TMP}/remote_container_dnsmasq_etc.log"
        create_rsync_cmd

        sed -i '$d' ${OS_TMP}/remote_container_pihole_etc.log; sed -i 's/"Source": "//' ${OS_TMP}/remote_container_pihole_etc.log; sed -i 's/",//' ${OS_TMP}/remote_container_pihole_etc.log; sed -i 's/ //g' ${OS_TMP}/remote_container_pihole_etc.log
        sed -i '$d' ${OS_TMP}/remote_container_dnsmasq_etc.log; sed -i 's/"Source": "//' ${OS_TMP}/remote_container_dnsmasq_etc.log; sed -i 's/",//' ${OS_TMP}/remote_container_dnsmasq_etc.log; sed -i 's/ //g' ${OS_TMP}/remote_container_dnsmasq_etc.log

        INPUT_REMOTE_PIHOLE_DIRECTORY=$(cat ${OS_TMP}/remote_container_pihole_etc.log)
        INPUT_REMOTE_DNSMASQ_DIRECTORY=$(cat ${OS_TMP}/remote_container_dnsmasq_etc.log)

        echo_good
        
        MESSAGE="${UI_CONFIG_SAVING} remote host ${UI_CORE_APP} ${UI_CONFIG_ETC_VOLUME_PATH} to ${GS_CONFIG_FILE}"
        echo_stat
        sudo sed -i "/# REMOTE_PIHOLE_DIRECTORY=''/c\REMOTE_PIHOLE_DIRECTORY='${INPUT_REMOTE_PIHOLE_DIRECTORY}'" ${GS_ETC_PATH}/${GS_CONFIG_FILE}
        error_validate
        
        MESSAGE="${UI_CONFIG_SAVING} remote host ${UI_CORE_APP_DNS} ${UI_CONFIG_ETC_VOLUME_PATH} to ${GS_CONFIG_FILE}"
        echo_stat
        sudo sed -i "/# REMOTE_DNSMASQ_DIRECTORY=''/c\REMOTE_DNSMASQ_DIRECTORY='${INPUT_REMOTE_DNSMASQ_DIRECTORY}'" ${GS_ETC_PATH}/${GS_CONFIG_FILE}
        error_validate
        
        MESSAGE="${UI_CONFIG_SAVING} remote host ${UI_CONFIG_VOLUME_OWNER} to ${GS_CONFIG_FILE}"
        echo_stat
        sudo sed -i "/# REMOTE_FILE_OWNER=''/c\REMOTE_FILE_OWNER='999:999'" ${GS_ETC_PATH}/${GS_CONFIG_FILE}
        error_validate
    fi

    end_config
}

## Delete Existing Configuration
function config_delete {
    # shellcheck source=/etc/gravity-sync/gravity-sync.conf
    source ${GS_ETC_PATH}/${GS_CONFIG_FILE}
    MESSAGE="${GS_CONFIG_FILE} ${UI_CONFIG_ALREADY}"
    echo_warn
  
    MESSAGE="${UI_CONFIG_CONFIRM}"
    echo_prompt

    intent_validate

    MESSAGE="${UI_CONFIG_ERASING} ${GS_CONFIG_FILE}"
    echo_stat
    sudo mv ${GS_ETC_PATH}/${GS_CONFIG_FILE} ${GS_ETC_PATH}/${GS_CONFIG_FILE}.${GS_BACKUP_EXT}
        error_validate

    config_generate
}

## Master Branch
function update_gs {
    bash ${GS_LOCAL_REPO}/update.sh
}

## Show Version
function show_version {
    if [ -f ${GS_LOCAL_REPO}/dev ]; then
        GS_DEV_VERSION="-dev"
    else
        GS_DEV_VERSION=""
    fi
    
    MESSAGE="Running version: ${GREEN}${GS_VERSION}${NC}${GS_DEV_VERSION}"
    echo_info
    
    GS_GIT_VERSION=$(curl -sf https://raw.githubusercontent.com/vmstan/gravity-sync/master/VERSION)
    if [ -z "$GS_GIT_VERSION" ]; then
        MESSAGE="Latest version: ${RED}Unknown${NC}"
    else
        if [ "$GS_GIT_VERSION" != "GS_VERSION" ]; then
            MESSAGE="Update available: ${RED}${GS_GIT_VERSION}${NC}"
        else
            MESSAGE="Latest version: ${GREEN}${GS_GIT_VERSION}${NC}"
        fi
    fi
    echo_info
}

function show_info {
    echo -e "${YELLOW}Local Software Versions${NC}"
    echo -e "${BLUE}${UI_CORE_APP}${NC}"
    if [ "${LOCAL_PIHOLE_TYPE}" == "default" ]; then
        pihole version
    elif [ "${LOCAL_PIHOLE_TYPE}" == "docker" ]; then 
        sudo docker exec -it pihole pihole -v
    elif [ "${LOCAL_PIHOLE_TYPE}" == "podman" ]; then 
        sudo podman exec -it pihole pihole -v
    fi
    
    if [ -f /etc/os-release ]; then
        . /etc/os-release
        OS_OS=$NAME
        OS_VER=$VERSION_ID
        echo -e "${BLUE}${OS_OS} ${OS_VER}${NC}" 
    fi

    uname -srm
    echo -e "bash $BASH_VERSION"
    ssh -V
    rsync --version | grep version
    sudo --version | grep "Sudo version"
    git --version
    
    if hash docker 2>/dev/null; then
        docker --version
    fi

    if hash podman 2>/dev/null; then
        podman --version
    fi

    echo -e ""
    
    echo -e "${YELLOW}Global Instance Settings${NC}"
    if [ ${GS_SSH_PORT} == '22' ]; then
        echo -e "SSH Port: 22 (default)"
    else
        echo -e "SSH Port: ${GS_SSH_PORT} (custom)"
    fi

    echo -e "SSH Key: ${GS_SSH_PKIF}"

    if systemctl is-active --quiet gravity-sync.timer; then
        echo -e "Automated Replication: Enabled"
    else
        echo -e "Automated Replication: Disabled"
    fi

    echo -e ""

    echo -e "${YELLOW}Local Instance Settings${NC}"
    echo -e "Local Hostname: $HOSTNAME"
    echo -e "Local ${UI_CORE_APP} Type: ${LOCAL_PIHOLE_TYPE}"
    echo -e "Local ${UI_CORE_APP} Config Directory: ${LOCAL_PIHOLE_DIRECTORY}"
    echo -e "Local ${UI_CORE_APP_DNS} Config Directory: ${LOCAL_DNSMASQ_DIRECTORY}"
    echo -e "Local ${PROGRAM} Binary: ${GS_FILEPATH}"
    echo -e "Local ${PROGRAM} Config Directory: ${GS_ETC_PATH}"
    
    if [ "${LOCAL_PIHOLE_TYPE}" == "default" ]; then
        echo -e "Local ${UI_CORE_APP} Binary Directory: ${LOCAL_PIHOLE_BINARY}"
    elif [ "${LOCAL_PIHOLE_TYPE}" == "docker" ]; then 
        echo -e "Local ${UI_CORE_APP} Container Name: ${LOCAL_DOCKER_CONTAINER}"
        echo -e "Local Docker Binary Directory: ${LOCAL_DOCKER_BINARY}"
    elif [ "${LOCAL_PIHOLE_TYPE}" == "podman" ]; then 
        echo -e "Local ${UI_CORE_APP} Container Name: ${LOCAL_DOCKER_CONTAINER}"
        echo -e "Local Podman Binary Directory: ${LOCAL_PODMAN_BINARY}"
    fi
    
    echo -e "Local File Owner Settings: ${LOCAL_FILE_OWNER}"
        
    echo -e ""
    echo -e "${YELLOW}Remote Instance Settings${NC}"
    echo -e "Remote Hostname/IP: ${REMOTE_HOST}"
    echo -e "Remote Username: ${REMOTE_USER}"
    echo -e "Remote ${UI_CORE_APP} Type: ${REMOTE_PIHOLE_TYPE}"
    echo -e "Remote ${UI_CORE_APP} Config Directory: ${REMOTE_PIHOLE_DIRECTORY}"
    echo -e "Remote ${UI_CORE_APP_DNS} Config Directory: ${REMOTE_DNSMASQ_DIRECTORY}"

    if [ "${REMOTE_PIHOLE_TYPE}" == "default" ]; then
        echo -e "Remote ${UI_CORE_APP} Binary Directory: ${REMOTE_PIHOLE_BINARY}"
    elif [ "${REMOTE_PIHOLE_TYPE}" == "docker" ]; then 
        echo -e "Remote ${UI_CORE_APP} Container Name: ${REMOTE_DOCKER_CONTAINER}"
        echo -e "Remote Docker Binary Directory: ${REMOTE_DOCKER_BINARY}"
    elif [ "${REMOTE_PIHOLE_TYPE}" == "podman" ]; then 
        echo -e "Remote ${UI_CORE_APP} Container Name: ${REMOTE_DOCKER_CONTAINER}"
        echo -e "Remote Podman Binary Directory: ${REMOTE_PODMAN_BINARY}"
    fi

    echo -e "Remote File Owner Settings: ${REMOTE_FILE_OWNER}"
}

## Dev Task
function task_dev {
    GS_TASK_TYPE='DEV'
    MESSAGE="${MESSAGE}: ${GS_TASK_TYPE}"
    echo_good
    
    if [ -f ${GS_LOCAL_REPO}/dev ]; then
        MESSAGE="Disabling ${GS_TASK_TYPE}"
        echo_stat
        sudo rm -f ${GS_LOCAL_REPO}/dev
        error_validate
    else
        MESSAGE="Enabling ${GS_TASK_TYPE}"
        echo_stat
        touch ${GS_LOCAL_REPO}/dev
        error_validate
        
        MESSAGE="Checking available branches"
        echo_stat
        (cd ${GS_LOCAL_REPO} || exit; git fetch --all >/dev/null 2>&1)
        error_validate
        
        (cd ${GS_LOCAL_REPO} || exit; git branch -r)
        
        MESSAGE="Select GitHub branch to update against"
        echo_need
        read -r INPUT_BRANCH
        
        echo -e "BRANCH='${INPUT_BRANCH}'" | sudo tee ${GS_LOCAL_REPO}/dev 1> /dev/null
    fi
    
    update_gs
    exit_with_changes
}

## Update Task
function task_update {
    GS_TASK_TYPE='UPDATE'
    MESSAGE="${MESSAGE}: ${GS_TASK_TYPE}"
    echo_good
    update_gs
    exit_with_changes
}

## Version Task
function task_version {
    GS_TASK_TYPE='VERSION'
    MESSAGE="${MESSAGE}: ${GS_TASK_TYPE}"
    echo_good
    show_version
    exit_no_change
}

## Info Task

function task_info {
    GS_TASK_TYPE='INFO'
    MESSAGE="${MESSAGE}: ${GS_TASK_TYPE}"
    echo_good
    show_info
    exit_no_change
}

## Automate Task
function task_automate {
    GS_TASK_TYPE='AUTOMATE'
    MESSAGE="${MESSAGE}: ${GS_TASK_TYPE}"
    echo_good

    MESSAGE="Customizing service file username"
    OS_CURRENT_USER=$(whoami)
    sudo sed -i "/User=unknown/c\User=${OS_CURRENT_USER}" ${GS_LOCAL_REPO}/templates/gravity-sync.service
    error_validate

    MESSAGE="Customizing service file executable path"
    sudo sed -i "/ExecStart=/c\ExecStart=${GS_FILEPATH}" ${GS_LOCAL_REPO}/templates/gravity-sync.service
    error_validate

    MESSAGE="Randomizing service timers"
    ACTIVE_REP=$((( RANDOM % 4 ) + 1 ))
    RANDOM_REP=$((( RANDOM % 8 ) + 2 ))
    sudo sed -i "/OnUnitInactiveSec=5m/c\OnUnitInactiveSec=${ACTIVE_REP}m" ${GS_LOCAL_REPO}/templates/gravity-sync.timer
    sudo sed -i "/RandomizedDelaySec=5m/c\RandomizedDelaySec=${RANDOM_REP}m" ${GS_LOCAL_REPO}/templates/gravity-sync.timer
    error_validate

    if systemctl is-active --quiet gravity-sync; then
        MESSAGE="Stopping existing systemd service"
        sudo systemctl stop gravity-sync
        error_validate
    fi

    MESSAGE="Moving systemd timer into place"
    sudo cp ${GS_LOCAL_REPO}/templates/gravity-sync.timer ${OS_DAEMON_PATH}
    error_validate

    MESSAGE="Moving systemd service into place"
    sudo cp ${GS_LOCAL_REPO}/templates/gravity-sync.service ${OS_DAEMON_PATH}
    error_validate

    MESSAGE="Reloading systemd daemon"
    sudo systemctl daemon-reload --quiet
    error_validate

    MESSAGE="Enabling ${PROGRAM} timer"
    sudo systemctl enable gravity-sync.timer --quiet
    error_validate

    MESSAGE="Starting ${PROGRAM} service"
    sudo systemctl start gravity-sync --quiet
    error_validate
    
    exit_with_changes
}

function task_disable_automate {
    GS_TASK_TYPE='DISABLE'
    MESSAGE="${MESSAGE}: ${GS_TASK_TYPE}"
    echo_good
    
    kill_automation_service
    exit_with_changes
}

function task_monitor {
    GS_TASK_TYPE='MONITOR'
    MESSAGE="${MESSAGE}: ${GS_TASK_TYPE}"
    echo_good

    MESSAGE="Press CTRL+Z to exit MONITOR mode"
    echo_warn

    sudo journalctl -fu gravity-sync
}

function kill_automation_service {
    if systemctl is-active --quiet gravity-sync; then
        MESSAGE="Stopping ${PROGRAM} timer"
        echo_stat
        sudo systemctl stop gravity-sync
        error_validate
    fi

        MESSAGE="Disabling ${PROGRAM} automation service"
        echo_stat
        sudo systemctl disable gravity-sync --quiet
        error_validate

        MESSAGE="Removing systemd timer"
        echo_stat
        sudo rm -f ${OS_DAEMON_PATH}/gravity-sync.timer
        error_validate

        MESSAGE="Removing systemd service"
        echo_stat
        sudo rm -f ${OS_DAEMON_PATH}/gravity-sync.service
        error_validate

        MESSAGE="Reloading systemd daemon"
        echo_stat
        sudo systemctl daemon-reload --quiet
        error_validate
}

## Purge Task
function task_purge {
    GS_TASK_TYPE="PURGE"
    MESSAGE="${MESSAGE}: ${GS_TASK_TYPE}"
    echo_good
    
    echo_blank
    echo -e "  THIS WILL REMOVE YOUR ENTIRE GRAVITY SYNC INSTALLATION"
    echo -e "  ${UI_CORE_APP} binaries, configuration and services ARE NOT impacted!"
    echo -e "  Your devices will continue to resolve and block DNS requests,"
    echo -e "  but your ${UI_GRAVITY_NAME} and ${UI_CUSTOM_NAME} WILL NOT sync anymore,"
    echo -e "  until you reconfigure ${PROGRAM} on this device."
    echo_blank
    echo -e "  In order to fully remove ${PROGRAM} from your infrastructure, you will also"
    echo -e "  need to run this same command from the peer instance as well."
    echo_blank
        
    intent_validate

    kill_automation_service
    
    MESSAGE="Removing ${PROGRAM} backup files"
    echo_stat
    sudo rm -f ${OS_TMP}/*.${GS_BACKUP_EXT}
    error_validate

    MESSAGE="Removing ${PROGRAM} configuration and logs"
    echo_stat
    sudo rm -fr ${GS_ETC_PATH}
    error_validate

    MESSAGE="Removing ${PROGRAM} binary"
    echo_stat
    sudo rm ${GS_FILEPATH}
    error_validate

    exit_with_changes
}

## No Changes Made
function exit_no_change {
    GS_RUN_END=$SECONDS
    ((GS_RUNTIME=GS_RUN_END-GS_RUN_START))
    
    if [ "${GS_TASK_TYPE}" == "" ]; then
        MESSAGE="${PROGRAM} ${UI_EXIT_ABORT} ${UI_EXIT_CALC_END} ${GS_RUNTIME} ${UI_EXIT_CALC_TIMER}"
    else
        MESSAGE="${PROGRAM} ${GS_TASK_TYPE} ${UI_EXIT_ABORT} ${UI_EXIT_CALC_END} ${GS_RUNTIME} ${UI_EXIT_CALC_TIMER}"
    fi
    
    echo_grav
    exit 0
}

## Changes Made
function exit_with_changes {
    GS_RUN_END=$SECONDS
    ((GS_RUNTIME=GS_RUN_END-GS_RUN_START))
    
    if [ "${GS_TASK_TYPE}" == "" ]; then
        MESSAGE="${PROGRAM} ${UI_EXIT_COMPLETE} ${UI_EXIT_CALC_END} ${GS_RUNTIME} ${UI_EXIT_CALC_TIMER}"
    else
        MESSAGE="${PROGRAM} ${GS_TASK_TYPE} ${UI_EXIT_COMPLETE} ${UI_EXIT_CALC_END} ${GS_RUNTIME} ${UI_EXIT_CALC_TIMER}"
    fi
    
    echo_grav
    exit 0
}

## List GS Arguments
function list_gs_arguments {
    echo -e "Usage: $0 [options]"
    echo -e "Example: '$0 pull'"
    echo_blank
    echo -e "Setup Options:"
    echo -e " ${YELLOW}config${NC}      Creates a new ${PROGRAM} configuration file"
    echo -e " ${YELLOW}version${NC}     Lists the installed version of ${PROGRAM} and checks for updates"
    echo -e " ${YELLOW}upgrade${NC}     Upgrades ${PROGRAM} to the latest available version on GitHub"
    echo -e " ${YELLOW}dev${NC}         Sets upgrade command to use a development version of ${PROGRAM} (toggle on/off)"
    echo -e " ${YELLOW}sudo${NC}        Enables password-less sudo for current user"
    echo -e " ${YELLOW}purge${NC}       Uninstalls ${PROGRAM} from this system"
    echo_blank
    echo -e "Replication Options:"
    echo -e " ${YELLOW}smart${NC}       Reviews all ${UI_CORE_APP} changes syncs them (default)"
    echo -e " ${YELLOW}pull${NC}        Syncs only the remote ${UI_CORE_APP} configuration to this server"
    echo -e " ${YELLOW}push${NC}        Syncs only the local ${UI_CORE_APP} configuration to the remote"
    echo -e " ${YELLOW}compare${NC}     Checks for ${UI_CORE_APP} differences without making changes"
    echo_blank
    echo -e "Automation Options:"
    echo -e " ${YELLOW}auto${NC}        Schedules ${PROGRAM} replication tasks using systemd timers"
    echo -e " ${YELLOW}monitor${NC}     Monitors the ${PROGRAM} replication job in real time"
    echo -e " ${YELLOW}disable${NC}     Disables the ${PROGRAM} automated replication task"
    echo_blank
    echo -e "Debug Options:"
    echo -e " ${YELLOW}logs${NC}        Shows the recent successful replication jobs/times"
    echo -e " ${YELLOW}info${NC}        Shows information about the current configuration"
    echo_blank
    exit_no_change
}

# SCRIPT EXECUTION ###########################

case $# in
    0)
        start_gs
        task_smart ;;
    1)
        case $1 in
            smart|sync)
                start_gs
                task_smart ;;
            pull)
                start_gs
                task_pull ;;
            push)
                start_gs
                task_push ;;
            version)
                start_gs_no_config
                task_version ;;
            update|upgrade)
                start_gs_no_config
                task_update ;;
            dev|development|develop)
                start_gs_no_config
                task_dev ;;
            logs|log)
                start_gs_no_config
                task_logs ;;
            compare)
                start_gs
                task_compare ;;
            config|configure)
                start_gs_no_config
                task_configure ;;
            auto|automate)
                start_gs
                task_automate ;;
            disable)
                start_gs_no_config
                task_disable_automate ;;
            monitor|follow)
                start_gs_no_config
                task_monitor ;;
            purge|uninstall|remove)
                start_gs_no_config
                task_purge ;;
            sudo)
                start_gs_no_config
                task_sudo ;;
            info)
                start_gs
                task_info ;;
            *)
                start_gs_no_config
                task_invalid ;;
        esac
    ;;
    
    *)
        start_gs_no_config
        task_invalid ;;
esac

# END OF SCRIPT ##############################