showmsg() {
    cat << EOF

    ################################################################################################
    ################################################################################################
    ##                                                                                            ##
    ##  Cellframe node                                                                            ##
    ##  ____________                                                                              ##
    ##                                                                                            ##
    ##  To start Cellframe node manually:                                                         ##
    ##                                                                                            ##
    ##      # Run from /opt/cellframe-node/bin                                                    ##
    ##                                                                                            ##
    ##  Run automatically:                                                                        ##
    ##                                                                                            ##
    ##      # systemctl enable --now cellframe-node.service                                       ##
    ##                                                                                            ##
    ##      OPTIONAL (for more aggressive logrotating):                                           ##
    ##      # systemctl enable --now cellframe-node-logrotate.timer                               ##
    ##                                                                                            ##
    ##  Network configuration is set to full mode by default.                                     ##
    ##  you can modify the network configuration parameters in:                                   ##
    ##                                                                                            ##
    ##      # /opt/cellframe-node/etc/network/*.cfg                                               ##
    ##                                                                                            ##
    ##  General configuration file:                                                               ##
    ##                                                                                            ##
    ##      # /opt/cellframe-node/etc/cellframe-node.cfg                                          ##
    ##                                                                                            ##
    ##  Documentation:                                                                            ##
    ##                                                                                            ##
    ##      https://wiki.cellframe.net/en/home                                                    ##
    ##                                                                                            ##
    ##  Setup a master node:                                                                      ##
    ##                                                                                            ##
    ##      https://wiki.cellframe.net/02.+Learn/Become+a+Master+Node/Master+Node+Manual+Setup    ##
    ##                                                                                            ##
    ################################################################################################
    ################################################################################################
EOF
}

post_install() {
    echo "==> Creating directories..."
    mkdir -p /opt/cellframe-node/var/{run,lib/wallet,lib/global_db,lib/plugins,lib/ca,log}
    chmod 777 /opt/cellframe-node/var/lib/ca
    echo "==> Copying configuration files..."
    cp /opt/cellframe-node/share/configs/cellframe-node.cfg.tpl /opt/cellframe-node/etc/cellframe-node.cfg
    cp /opt/cellframe-node/share/configs/network/Backbone.cfg.tpl /opt/cellframe-node/etc/network/Backbone.cfg
    echo "==> Generating default configuration files..."
    sed -i 's|{DEBUG_MODE}|false|' /opt/cellframe-node/etc/cellframe-node.cfg
    sed -i 's|{PREFIX}|/opt/cellframe-node|g' /opt/cellframe-node/etc/cellframe-node.cfg
    sed -i 's|{AUTO_ONLINE}|true|' /opt/cellframe-node/etc/cellframe-node.cfg
    sed -i 's|{SERVER_ENABLED}|true|' /opt/cellframe-node/etc/cellframe-node.cfg
    sed -i 's|{SERVER_ADDR}|0.0.0.0|' /opt/cellframe-node/etc/cellframe-node.cfg
    sed -i 's|{SERVER_PORT}|8079|' /opt/cellframe-node/etc/cellframe-node.cfg
    sed -i 's|{NOTIFY_SRV_ADDR}|127.0.0.1|' /opt/cellframe-node/etc/cellframe-node.cfg
    sed -i 's|{NOTIFY_SRV_PORT}|8080|' /opt/cellframe-node/etc/cellframe-node.cfg
    sed -i "s|{DB_DRIVER}|mdbx|" /opt/cellframe-node/etc/cellframe-node.cfg
    sed -i 's|{NODE_TYPE}|full|' /opt/cellframe-node/etc/network/Backbone.cfg
    
    echo "==> Creating symbolic links for executables..."
    for _executables in cellframe-node-cli cellframe-node-tool cellframe-node
	do
		ln -sf "/opt/cellframe-node/bin/$_executables" "/usr/local/bin/$_executables"
	done

    showmsg
}

post_upgrade() {
    systemctl daemon-reload
    systemctl is-active --quiet cellframe-node.service && systemctl restart cellframe-node.service
    showmsg
}

pre_remove() {
    systemctl is-active --quiet cellframe-node.service && systemctl stop cellframe-node.service
    systemctl is-active --quiet cellframe-node-logrotate.timer && systemctl stop cellframe-node-logrotate.timer
    systemctl is-enabled --quiet cellframe-node.service && systemctl disable cellframe-node.service
    systemctl is-enabled --quiet cellframe-node-logrotate.timer && systemctl disable cellframe-node-logrotate.timer
    systemctl daemon-reload
}

post_remove() {
    echo "==> Removing symbolic links for executables..."
    for _executables in cellframe-node-cli cellframe-node-tool cellframe-node
	do
		unlink "/usr/local/bin/$_executables"
	done
}